/* ============================================
   同城AI共建商圈 · V3 橙色科技风
   Orange + White · 暗色背景 · 科技动效
   ============================================ */

/* ========== 设计 Token ========== */
:root {
  /* 主色 - 橙色系 */
  --c-orange: #FF6B35;
  --c-orange-light: #FF8F5A;
  --c-orange-dark: #E55A1F;
  --c-orange-glow: rgba(255, 107, 53, 0.35);
  --c-orange-soft: rgba(255, 107, 53, 0.08);
  --c-orange-border: rgba(255, 107, 53, 0.2);

  /* 渐变 */
  --g-orange: linear-gradient(135deg, #FF6B35 0%, #FF8F5A 50%, #FFA726 100%);
  --g-orange-hot: linear-gradient(135deg, #FF6B35 0%, #FF3D00 100%);
  --g-orange-warm: linear-gradient(135deg, #FF8F5A 0%, #FF6B35 100%);

  /* 背景 */
  --c-dark: #0D0D0D;
  --c-dark-2: #141414;
  --c-dark-3: #1A1A1A;
  --c-dark-4: #222222;

  /* 文字 */
  --c-white: #FFFFFF;
  --c-white-90: rgba(255,255,255,0.9);
  --c-white-70: rgba(255,255,255,0.7);
  --c-white-50: rgba(255,255,255,0.5);
  --c-white-30: rgba(255,255,255,0.3);
  --c-white-15: rgba(255,255,255,0.15);

  /* 浅色区文字 */
  --c-text: #1A1A1A;
  --c-text-body: #444444;
  --c-text-muted: #777777;

  /* 表面 */
  --c-surface: #FAFAFA;
  --c-card: #FFFFFF;
  --c-card-dark: #181818;
  --c-border: rgba(255,255,255,0.08);
  --c-border-light: #EEEEEE;

  /* 字体 */
  --font: 'Plus Jakarta Sans', -apple-system, 'PingFang SC',
    'Microsoft YaHei', sans-serif;

  /* 尺寸 */
  --container: 720px;
  --container-md: 960px;
  --container-wide: 1320px;
  --section-py: clamp(4.5rem, 10vw, 7.5rem);

  /* 圆角 */
  --r-sm: 12px;
  --r-md: 18px;
  --r-lg: 24px;
  --r-xl: 32px;
  --r-full: 9999px;

  /* 阴影 */
  --shadow-glow: 0 8px 40px var(--c-orange-glow);
  --shadow-card: 0 4px 20px rgba(0,0,0,0.12);
  --shadow-card-hover: 0 12px 40px rgba(0,0,0,0.18);

  /* 动效 */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --dur-fast: 0.25s;
  --dur: 0.45s;
  --dur-slow: 0.7s;
}

/* ========== 重置 & 基础 ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 72px;
}

body {
  font-family: var(--font);
  background: var(--c-dark);
  color: var(--c-white-90);
  line-height: 1.65;
  font-size: 17px;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }

strong { font-weight: 700; color: inherit; }

::selection {
  background: var(--c-orange);
  color: var(--c-white);
}

.text-orange { color: var(--c-orange); }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.container--md { max-width: var(--container-md); }
.container--wide { max-width: var(--container-wide); }

.section { padding: var(--section-py) 0; position: relative; }

/* ========== 区块通用标题 ========== */
.section__head { text-align: center; margin-bottom: clamp(2.5rem, 8vw, 4rem); }

.section__tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--c-orange);
  background: var(--c-orange-soft);
  border: 1px solid var(--c-orange-border);
  padding: 5px 16px;
  border-radius: var(--r-full);
  margin-bottom: 16px;
}
.section__tag--light {
  color: var(--c-orange-light);
  background: rgba(255,143,90,0.1);
  border-color: rgba(255,143,90,0.25);
}

.section__title {
  font-size: clamp(1.8rem, 8vw, 2.8rem);
  font-weight: 900;
  letter-spacing: 0.08em;
  line-height: 1.15;
  color: var(--c-white);
}
.section__title--light { color: var(--c-white); }

.section__sub {
  font-size: 1rem;
  color: var(--c-white-50);
  margin-top: 12px;
  font-weight: 400;
}
.section__sub--light { color: var(--c-white-50); }


/* ================================
   导航栏（完整菜单版）
   ================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  transition: all 0.35s var(--ease-out-expo);
  background: rgba(13, 13, 13, 0.72);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.nav.scrolled {
  background: rgba(13, 13, 13, 0.92);
  border-bottom-color: rgba(255,255,255,0.08);
  box-shadow: 0 4px 30px rgba(0,0,0,0.3);
}

.nav__inner {
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.nav__logo-icon {
  width: 30px; height: 30px;
  color: var(--c-orange);
}
.nav__brand-text {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--c-white);
}

/* 桌面导航链接 */
.nav__links {
  display: none;
  align-items: center;
  gap: 2px;
}
.nav__link {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-white-50);
  padding: 8px 13px;
  border-radius: var(--r-sm);
  transition: all 0.25s var(--ease-out-expo);
  letter-spacing: 0.01em;
}
.nav__link:hover,
.nav__link.active {
  color: var(--c-white);
  background: rgba(255,255,255,0.06);
}
.nav__link.active { color: var(--c-orange); }
.nav__link--cta {
  margin-left: 6px;
  color: var(--c-white) !important;
  background: var(--g-orange) !important;
  padding: 8px 20px;
  border-radius: var(--r-full);
  box-shadow: var(--shadow-glow);
}
.nav__link--cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 48px var(--c-orange-glow);
}

/* 汉堡按钮 */
.nav__burger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px; height: 36px;
  background: none;
  border: 1.5px solid rgba(255,255,255,0.15);
  border-radius: 10px;
  cursor: pointer;
  padding: 8px;
  transition: all 0.3s var(--ease-out-expo);
}
.nav__burger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--c-white);
  border-radius: 2px;
  transition: all 0.35s var(--ease-out-expo);
  transform-origin: center;
}
.nav__burger.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav__burger.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav__burger.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* 移动端下拉菜单 */
.nav__mobile-menu {
  display: none;
  flex-direction: column;
  padding: 12px 20px 20px;
  background: rgba(13,13,13,0.98);
  border-top: 1px solid rgba(255,255,255,0.05);
  transform: translateY(-100%);
  opacity: 0;
  transition: all 0.4s var(--ease-out-expo);
}
.nav__mobile-menu.open {
  display: flex;
  transform: translateY(0);
  opacity: 1;
}
.nav__m-link {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-white-70);
  padding: 14px 16px;
  border-radius: var(--r-sm);
  transition: all 0.2s;
  letter-spacing: 0.01em;
}
.nav__m-link:hover { color: var(--c-white); background: rgba(255,255,255,0.04); }
.nav__m-link--cta {
  margin-top: 8px;
  text-align: center;
  color: var(--c-white) !important;
  background: var(--g-orange) !important;
  border-radius: var(--r-full);
  box-shadow: var(--shadow-glow);
}


/* ================================
   Hero 首屏
   ================================ */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding: 110px 24px 100px;
  background: linear-gradient(
    165deg,
    #0D0D0D 0%,
    #120C08 30%,
    #1A0E08 60%,
    #0D0D0D 100%
  );
}

/* 粒子画布 */
.hero__particles {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

/* 网格背景 */
.hero__grid-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(255,107,53,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,107,53,0.03) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}

/* 浮动光晕 */
.hero__orbs > div {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  animation: orbFloat 12s ease-in-out infinite;
}
.hero__orb--1 {
  width: 480px; height: 480px;
  background: radial-gradient(circle, rgba(255,107,53,0.3), transparent 70%);
  top: -12%; right: -8%;
  animation-delay: 0s;
}
.hero__orb--2 {
  width: 360px; height: 360px;
  background: radial-gradient(circle, rgba(255,140,50,0.18), transparent 70%);
  bottom: -8%; left: -6%;
  animation-delay: -4s;
}
.hero__orb--3 {
  width: 240px; height: 240px;
  background: radial-gradient(circle, rgba(255,107,53,0.12), transparent 70%);
  top: 45%; left: 55%;
  animation-delay: -8s;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -25px) scale(1.08); }
  66% { transform: translate(-20px, 20px) scale(0.94); }
}

/* Hero 内容 */
.hero__content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.hero__main {
  width: 100%;
  max-width: 760px;
}

.hero__side {
  display: none;
  width: 420px;
  flex-shrink: 0;
}

.hero__tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  color: var(--c-orange-light);
  background: rgba(255,107,53,0.08);
  border: 1px solid rgba(255,107,53,0.2);
  padding: 7px 20px;
  border-radius: var(--r-full);
  margin-bottom: 32px;
  letter-spacing: 0.08em;
}
.hero__tag-dot {
  width: 7px; height: 7px;
  background: var(--c-orange);
  border-radius: 50%;
  animation: dotPulse 2s ease-in-out infinite;
}
@keyframes dotPulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 var(--c-orange-glow); }
  50% { opacity: 0.6; box-shadow: 0 0 0 6px transparent; }
}

.hero__title {
  margin-bottom: 16px;
}
.hero__title-line {
  display: block;
  font-size: clamp(2.8rem, 13vw, 5rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.05;
  color: var(--c-white);
}
.hero__title-line--accent {
  background: var(--g-orange);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: clamp(1.2rem, 5vw, 1.7rem);
  font-weight: 600;
  color: var(--c-orange-light);
  letter-spacing: 0.15em;
  margin-bottom: 24px;
}

.hero__desc {
  font-size: clamp(1rem, 3.5vw, 1.15rem);
  color: var(--c-white-50);
  line-height: 1.85;
  margin-bottom: 40px;
}

.hero__side-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--r-xl);
  padding: 40px;
  backdrop-filter: blur(16px);
  text-align: left;
  position: relative;
  overflow: hidden;
}
.hero__side-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--g-orange);
}
.hero__side-title {
  font-size: clamp(1.25rem, 1.8vw, 1.65rem);
  font-weight: 800;
  color: var(--c-white);
  margin-bottom: 28px;
}
.hero__side-accordion {
  display: flex;
  flex-direction: column;
  gap: 16px;
  overflow: hidden;
}

.hero__side-item {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: all 0.35s var(--ease-out-expo);
}
.hero__side-item:hover {
  border-color: rgba(255,107,53,0.2);
  background: rgba(255,107,53,0.04);
}
.hero__side-item[open] {
  border-color: rgba(255,107,53,0.25);
  background: rgba(255,107,53,0.06);
}
.hero__side-item[open] .hero__side-arrow { transform: rotate(180deg); }

.hero__side-header {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 22px 24px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.hero__side-header::-webkit-details-marker { display: none; }

.hero__side-check {
  width: 32px; height: 32px;
  color: var(--c-orange);
  flex-shrink: 0;
}
.hero__side-check svg { width: 100%; height: 100%; }

.hero__side-name {
  flex: 1;
  font-size: clamp(1.05rem, 1.5vw, 1.35rem);
  font-weight: 700;
  color: var(--c-white-90);
  line-height: 1.35;
}

.hero__side-arrow {
  width: 24px; height: 24px;
  color: var(--c-white-30);
  flex-shrink: 0;
  transition: transform 0.35s var(--ease-out-expo);
}
.hero__side-arrow svg { width: 100%; height: 100%; }

.hero__side-body {
  padding: 0 24px 24px 72px;
  animation: accOpen 0.4s var(--ease-out-expo);
}
.hero__side-body p {
  font-size: clamp(0.95rem, 1.2vw, 1.1rem);
  color: var(--c-white-50);
  line-height: 1.75;
}

/* 统计数字条 */
.hero__stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 40px;
  padding: 20px 28px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--r-lg);
  backdrop-filter: blur(8px);
}
.hero__stat {
  text-align: center;
}
.hero__stat-num {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--c-orange);
  line-height: 1;
  letter-spacing: -0.02em;
}
.hero__stat-suffix {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--c-orange-light);
}
.hero__stat-label {
  display: block;
  font-size: 0.78rem;
  color: var(--c-white-30);
  margin-top: 4px;
  letter-spacing: 0.05em;
  font-weight: 500;
}
.hero__stat-divider {
  width: 1px;
  height: 36px;
  background: rgba(255,255,255,0.1);
}

/* Hero 按钮 */
.hero__actions {
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
}
.hero__actions .btn {
  font-size: 16px;
  padding: 13px 32px;
  min-width: 158px;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: inherit;
  font-size: 16px;
  font-weight: 700;
  padding: 17px 36px;
  border-radius: var(--r-full);
  border: none;
  cursor: pointer;
  transition: all 0.3s var(--ease-out-expo);
  -webkit-tap-highlight-color: transparent;
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; transition: transform 0.3s var(--ease-out-expo); }
.btn:active { transform: scale(0.97); }

.btn--primary {
  background: var(--g-orange);
  color: var(--c-white);
  box-shadow: var(--shadow-glow);
  font-size: 17px;
  padding: 19px 42px;
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 48px rgba(255,107,53,0.45);
}
.btn--primary:hover svg { transform: translateX(4px); }

.btn--lg {
  font-size: 18px;
  padding: 20px 46px;
}

.btn--outline {
  background: transparent;
  color: var(--c-white-70);
  border: 1.5px solid rgba(255,255,255,0.15);
}
.btn--outline:hover {
  color: var(--c-white);
  border-color: var(--c-orange);
  background: rgba(255,107,53,0.06);
}

/* 滚动提示 */
.hero__scroll-hint {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  z-index: 2;
}
.hero__scroll-hint span {
  font-size: 11px;
  color: var(--c-white-30);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.hero__scroll-mouse {
  width: 22px; height: 34px;
  border: 2px solid rgba(255,255,255,0.15);
  border-radius: 11px;
  position: relative;
}
.hero__scroll-wheel {
  width: 3px; height: 8px;
  background: var(--c-orange);
  border-radius: 2px;
  position: absolute;
  top: 6px; left: 50%;
  transform: translateX(-50%);
  animation: scrollWheel 2s ease-in-out infinite;
}
@keyframes scrollWheel {
  0%, 100% { top: 6px; opacity: 1; }
  50% { top: 18px; opacity: 0.3; }
}


/* ================================
   核心定位 About
   ================================ */
.section--about {
  background: var(--c-surface);
  color: var(--c-text);
}
.section--about .section__title { color: var(--c-text); }

.about__card {
  background: var(--c-card);
  border-radius: var(--r-xl);
  padding: clamp(32px, 6vw, 52px);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--c-border-light);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.about__card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--g-orange);
}

.about__icon-wrap {
  display: inline-flex;
  margin-bottom: 24px;
}
.about__ai-ring {
  width: 88px; height: 88px;
  border-radius: 50%;
  background: var(--c-orange-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: aiRingPulse 3s ease-in-out infinite;
}
@keyframes aiRingPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255,107,53,0.15); }
  50% { box-shadow: 0 0 0 16px rgba(255,107,53,0); }
}
.about__ai-icon {
  width: 44px; height: 44px;
  color: var(--c-orange);
}

.about__lead {
  font-size: clamp(1.25rem, 4vw, 1.55rem);
  font-weight: 700;
  color: var(--c-text);
  line-height: 1.4;
  margin-bottom: 12px;
}

.about__sub {
  font-size: 1.05rem;
  color: var(--c-text-body);
  line-height: 1.75;
  margin-bottom: 24px;
}

.about__tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 24px;
}
.about__tag {
  font-size: 14px;
  font-weight: 700;
  color: var(--c-text-muted);
  background: #F0F0F0;
  padding: 8px 22px;
  border-radius: var(--r-full);
  transition: all 0.25s;
}
.about__tag--active,
.about__tag:hover {
  color: var(--c-white);
  background: var(--g-orange);
}

.about__summary {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--c-orange);
  letter-spacing: 0.03em;
}


/* ================================
   折叠面板 Benefits (Accordion)
   ================================ */
.accordion {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.acc-item {
  background: var(--c-card-dark);
  border-radius: var(--r-lg);
  border: 1px solid rgba(255,255,255,0.06);
  overflow: hidden;
  transition: all 0.35s var(--ease-out-expo);
}
.acc-item:hover {
  border-color: rgba(255,107,53,0.15);
}
.acc-item[open] {
  border-color: rgba(255,107,53,0.2);
  box-shadow: 0 8px 32px rgba(255,107,53,0.08);
}
.acc-item[open] .acc-arrow {
  transform: rotate(180deg);
}

.acc-header {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 24px;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.acc-header::-webkit-details-marker { display: none; }

.acc-left {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 1;
  min-width: 0;
}

.acc-num {
  font-size: 1.6rem;
  font-weight: 900;
  color: rgba(255,107,53,0.15);
  line-height: 1;
  flex-shrink: 0;
  transition: color 0.3s;
}
.acc-item[open] .acc-num,
.acc-item:hover .acc-num { color: rgba(255,107,53,0.35); }

.acc-info { display: flex; align-items: center; gap: 12px; flex: 1; min-width: 0; }

.acc-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--c-white-90);
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.acc-badge {
  flex-shrink: 0;
  font-size: 11px;
  font-weight: 800;
  color: var(--c-orange);
  background: var(--c-orange-soft);
  border: 1px solid var(--c-orange-border);
  padding: 3px 10px;
  border-radius: var(--r-full);
  letter-spacing: 0.05em;
}
.acc-badge--blue {
  color: #60A5FA;
  background: rgba(96,165,250,0.1);
  border-color: rgba(96,165,250,0.2);
}
.acc-badge--green {
  color: #34D399;
  background: rgba(52,211,153,0.1);
  border-color: rgba(52,211,153,0.2);
}

.acc-arrow {
  flex-shrink: 0;
  width: 24px; height: 24px;
  color: var(--c-white-30);
  transition: transform 0.35s var(--ease-out-expo);
}
.acc-arrow svg { width: 100%; height: 100%; }

/* 展开内容区 */
.acc-body {
  padding: 0 24px 24px 82px;
  animation: accOpen 0.4s var(--ease-out-expo);
}
@keyframes accOpen {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.acc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}
.acc-list li {
  font-size: 0.95rem;
  color: var(--c-white-70);
  padding-left: 20px;
  position: relative;
  line-height: 1.6;
}
.acc-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--c-orange);
  box-shadow: 0 0 8px var(--c-orange-glow);
}

.acc-note {
  font-size: 0.86rem;
  color: var(--c-white-30);
  padding-top: 12px;
  border-top: 1px solid rgba(255,255,255,0.06);
  font-style: italic;
}


/* ================================
   时间线 Rules
   ================================ */
.section--rules {
  background: linear-gradient(180deg, var(--c-dark-2), var(--c-dark));
}

.timeline {
  max-width: 560px;
  margin: 0 auto;
  position: relative;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 26px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom,
    var(--c-orange),
    rgba(255,107,53,0.15)
  );
  border-radius: 2px;
}

.tl-item {
  display: flex;
  gap: 24px;
  padding-bottom: 36px;
  position: relative;
  align-items: flex-start;
}
.tl-item:last-child { padding-bottom: 0; }

.tl-node {
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}
.tl-inner {
  width: 54px; height: 54px;
  border-radius: 50%;
  background: var(--c-dark-3);
  border: 2px solid rgba(255,107,53,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.35s var(--ease-out-expo);
  position: relative;
}
.tl-item:hover .tl-inner {
  border-color: var(--c-orange);
  box-shadow: 0 0 24px var(--c-orange-glow);
  background: rgba(255,107,53,0.08);
}
.tl-inner--final {
  border-color: var(--c-orange);
  background: var(--c-orange-soft);
}
.tl-icon {
  width: 24px; height: 24px;
  color: var(--c-orange);
}
.tl-icon svg { width: 100%; height: 100%; }

.tl-content {
  flex: 1;
  padding-top: 10px;
}
.tl-step {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--c-orange);
  opacity: 0.7;
  margin-bottom: 6px;
}
.tl-content h3 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--c-white);
  letter-spacing: -0.01em;
  margin-bottom: 8px;
}
.tl-content p {
  font-size: 0.95rem;
  color: var(--c-white-50);
  line-height: 1.7;
}
.tl-illustration {
  flex-shrink: 0;
  width: 110px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: auto;
  align-self: center;
}
.tl-illustration svg {
  width: 100%;
  height: 100%;
}


/* ================================
   Bento 网格 Services
   ================================ */
.section--services {
  background: var(--c-surface);
}
.section--services .section__title { color: var(--c-text); }

.bento-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.bento {
  background: var(--c-card);
  border-radius: var(--r-md);
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 12px;
  border: 1px solid #EEE;
  transition: all 0.35s var(--ease-out-expo);
  position: relative;
  overflow: hidden;
  cursor: default;
}
.bento:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--c-orange);
}
.bento:active { transform: scale(0.98); }

/* 数据卡片 */
.bento--stat {
  justify-content: center;
  background: linear-gradient(135deg, rgba(255,107,53,0.12), rgba(255,140,66,0.06));
  border: 1px solid rgba(255,107,53,0.15);
  gap: 8px;
}
.bento--stat:hover {
  border-color: rgba(255,107,53,0.35);
  box-shadow: 0 12px 36px rgba(255,107,53,0.12);
}
.bento__stat-num {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 900;
  color: var(--c-orange);
  line-height: 1;
}
.bento__stat-label {
  font-size: 0.9rem;
  color: var(--c-white-60);
  font-weight: 600;
}

/* 大卡片 - AI 技能培训教学 */
.bento--lg {
  grid-column: span 2;
  padding: 40px 28px;
  background: linear-gradient(135deg, var(--c-dark), var(--c-dark-3));
  border: 1px solid rgba(255,255,255,0.08);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 16px;
}
.bento--lg .bento__icon {
  color: var(--c-orange);
  width: 72px; height: 72px;
}
.bento--lg .bento__name {
  color: var(--c-white);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  white-space: nowrap;
}
.bento--lg .bento__desc {
  color: var(--c-white-50);
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  white-space: nowrap;
}

/* 高亮卡片 */
.bento--highlight {
  background: linear-gradient(135deg, var(--c-orange), var(--c-orange-light));
  border: none;
}
.bento--highlight .bento__icon { color: var(--c-white); }
.bento--highlight .bento__name { color: var(--c-white); font-weight: 800; }
.bento--highlight .bento__desc { color: rgba(255,255,255,0.8); }
.bento--highlight:hover { transform: translateY(-4px) scale(1.01); }

/* 宽卡片 */
.bento--wide { grid-column: span 2; }

.bento__icon {
  width: 44px; height: 44px;
  color: var(--c-orange);
  transition: transform 0.35s var(--ease-spring);
}
.bento:hover .bento__icon { transform: scale(1.1) translateY(-2px); }
.bento__icon svg { width: 100%; height: 100%; }

.bento__name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-text);
  letter-spacing: -0.005em;
  line-height: 1.3;
}
.bento__desc {
  font-size: 0.87rem;
  color: var(--c-text-muted);
  line-height: 1.5;
  margin-top: -4px;
}


/* ================================
   CTA 加入方式
   ================================ */
.section--join {
  background: var(--c-dark);
}

.cta-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 40px;
}

.cta-content { text-align: center; max-width: 500px; }

.cta-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.15em;
  color: var(--c-orange);
  background: var(--c-orange-soft);
  border: 1px solid var(--c-orange-border);
  padding: 5px 16px;
  border-radius: var(--r-full);
  margin-bottom: 16px;
}

.cta-title {
  font-size: clamp(1.6rem, 6.5vw, 2.4rem);
  font-weight: 900;
  letter-spacing: -0.025em;
  line-height: 1.25;
  color: var(--c-white);
  margin-bottom: 16px;
}

.cta-desc {
  font-size: 1.1rem;
  color: var(--c-white-50);
  margin-bottom: 28px;
}

.cta-checklist {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 300px;
  margin: 0 auto;
  text-align: left;
}
.cta-checklist li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-white-70);
}
.cta-checklist svg {
  flex-shrink: 0;
  width: 22px; height: 22px;
  color: var(--c-orange);
}

/* QR区域 */
.cta-qr-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.qr-box {
  width: 200px; height: 200px;
  background: var(--c-white);
  border-radius: var(--r-xl);
  padding: 14px;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}
.qr-code { width: 100%; height: 100%; }
.qr-scan-line {
  position: absolute;
  left: 14px; right: 14px;
  height: 3px;
  background: var(--g-orange);
  top: 14px;
  animation: qrScan 2.5s ease-in-out infinite;
  border-radius: 2px;
  box-shadow: 0 0 12px var(--c-orange-glow);
}
@keyframes qrScan {
  0% { top: 14px; }
  50% { top: calc(100% - 17px); }
  100% { top: 14px; }
}

.qr-text {
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-white-90);
}
.qr-sub {
  font-size: 0.82rem;
  color: var(--c-white-30);
}


/* ================================
   数据展示 Stats
   ================================ */
.section--stats {
  padding-top: 0;
  display: flex;
  align-items: center;
  min-height: 200px;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.stat-card {
  background: var(--c-card-dark);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--r-lg);
  padding: 28px 22px;
  text-align: center;
  transition: all 0.35s var(--ease-out-expo);
}
.stat-card:hover {
  border-color: rgba(255,107,53,0.2);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(255,107,53,0.08);
}
.stat-card__num {
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 900;
  color: var(--c-orange);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-card__suffix {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--c-orange-light);
}
.stat-card__label {
  font-size: 0.92rem;
  color: var(--c-white-50);
  font-weight: 500;
}


/* ================================
   案例展示 Cases
   ================================ */
.section--cases {
  background: var(--c-dark-2);
}
.cases-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.case-card {
  background: var(--c-card-dark);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--r-xl);
  padding: 32px;
  transition: all 0.35s var(--ease-out-expo);
  position: relative;
  overflow: hidden;
}
.case-card:hover {
  border-color: rgba(255,107,53,0.2);
  transform: translateY(-5px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.25);
}
.case-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--g-orange);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease-out-expo);
}
.case-card:hover::before { transform: scaleX(1); }
.case-card__tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--c-orange);
  background: var(--c-orange-soft);
  border: 1px solid var(--c-orange-border);
  padding: 4px 12px;
  border-radius: var(--r-full);
  margin-bottom: 16px;
}
.case-card__title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--c-white);
  margin-bottom: 12px;
  line-height: 1.3;
}
.case-card__desc {
  font-size: 0.98rem;
  color: var(--c-white-50);
  line-height: 1.7;
  margin-bottom: 20px;
}
.case-card__result {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--c-orange-light);
}
.case-card__result svg {
  width: 20px; height: 20px;
  color: var(--c-orange);
  flex-shrink: 0;
}


/* ================================
   共建项目 Projects
   ================================ */
.section--projects {
  background: var(--c-dark-2);
}
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.project-card {
  background: var(--c-card-dark);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--r-xl);
  padding: 32px;
  display: flex;
  flex-direction: column;
  transition: all 0.35s var(--ease-out-expo);
  position: relative;
  overflow: hidden;
}
.project-card:hover {
  border-color: rgba(255,107,53,0.2);
  transform: translateY(-5px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.25);
}
.project-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--g-orange);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease-out-expo);
}
.project-card:hover::before { transform: scaleX(1); }
.project-card__status {
  display: inline-flex;
  align-self: flex-start;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--c-orange);
  background: var(--c-orange-soft);
  border: 1px solid var(--c-orange-border);
  padding: 4px 12px;
  border-radius: var(--r-full);
  margin-bottom: 16px;
  text-transform: uppercase;
}
.project-card__status--pre {
  color: #60A5FA;
  background: rgba(96,165,250,0.1);
  border-color: rgba(96,165,250,0.2);
}
.project-card__status--reserved {
  color: var(--c-white-50);
  background: rgba(255,255,255,0.05);
  border-color: rgba(255,255,255,0.1);
}
.project-card__name {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--c-white);
  margin-bottom: 14px;
  line-height: 1.25;
}
.project-card__desc {
  font-size: 1rem;
  color: var(--c-white-50);
  line-height: 1.75;
  margin-bottom: 24px;
  flex: 1;
}
.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--c-orange);
  padding: 12px 20px;
  border: 1.5px solid var(--c-orange-border);
  border-radius: var(--r-full);
  transition: all 0.25s var(--ease-out-expo);
  align-self: flex-start;
}
.project-card__link:hover {
  background: var(--c-orange);
  color: var(--c-white);
  border-color: var(--c-orange);
}
.project-card__link svg {
  width: 16px; height: 16px;
}
.project-card--reserved {
  opacity: 0.85;
}
.project-card--reserved .project-card__actions {
  display: none;
}

.project-card__qr-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 20px;
}
.project-card__qr {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.project-card__qr img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  border-radius: var(--r-md);
  border: 1px solid rgba(255,255,255,0.08);
  background: var(--c-white);
  padding: 6px;
}
.project-card__qr span {
  font-size: 0.75rem;
  color: var(--c-white-40);
}
.project-card__qr--empty {
  width: 100%;
  aspect-ratio: 1 / 1;
  justify-content: center;
  border: 1.5px dashed rgba(255,255,255,0.1);
  border-radius: var(--r-md);
  padding: 16px;
}
.project-card__qr--empty svg {
  width: 36px; height: 36px;
  color: var(--c-white-20);
}
.project-card__qr--empty span {
  font-size: 0.75rem;
  color: var(--c-white-30);
}

.project-card__actions {
  display: flex;
  gap: 10px;
  margin-top: auto;
}
.project-card__btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  padding: 12px 14px;
  border-radius: var(--r-full);
  border: 1.5px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.25s var(--ease-out-expo);
}
.project-card__btn--primary {
  color: var(--c-white);
  background: var(--g-orange);
  border-color: transparent;
}
.project-card__btn--primary:hover {
  filter: brightness(1.1);
}
.project-card__btn--secondary {
  color: var(--c-white);
  background: transparent;
  border-color: var(--c-orange-border);
}
.project-card__btn--secondary:hover {
  background: var(--c-orange);
  border-color: var(--c-orange);
}


/* ================================
   常见问题 FAQ
   ================================ */
.section--faq {
  background: linear-gradient(180deg, var(--c-dark-2), var(--c-dark));
}
.faq-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
}
.faq-item {
  background: var(--c-card-dark);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: all 0.35s var(--ease-out-expo);
}
.faq-item:hover { border-color: rgba(255,107,53,0.15); }
.faq-item[open] { border-color: rgba(255,107,53,0.2); }
.faq-item[open] .faq-arrow { transform: rotate(180deg); }
.faq-header {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 24px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.faq-header::-webkit-details-marker { display: none; }
.faq-q {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--c-white-90);
  line-height: 1.45;
}
.faq-arrow {
  width: 22px; height: 22px;
  color: var(--c-white-30);
  flex-shrink: 0;
  transition: transform 0.35s var(--ease-out-expo);
}
.faq-arrow svg { width: 100%; height: 100%; }
.faq-body {
  padding: 0 24px 24px;
  color: var(--c-white-50);
  font-size: 0.98rem;
  line-height: 1.75;
  animation: accOpen 0.4s var(--ease-out-expo);
}


/* ================================
   Footer
   ================================ */
.footer {
  background: var(--c-dark-2);
  padding: 3.5rem 0 3rem;
  border-top: 1px solid rgba(255,255,255,0.04);
}

.footer__top {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  margin-bottom: 24px;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--c-white-90);
}
.footer__logo-svg {
  width: 26px; height: 26px;
  color: var(--c-orange);
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 24px;
}
.footer__links a {
  font-size: 14px;
  color: var(--c-white-30);
  transition: color 0.2s;
}
.footer__links a:hover { color: var(--c-orange); }

.footer__divider {
  height: 1px;
  background: rgba(255,255,255,0.05);
  margin-bottom: 20px;
}

.footer__copy {
  text-align: center;
  font-size: 0.8rem;
  color: var(--c-white-15);
}


/* ================================
   固定底部CTA（移动端）
   ================================ */
.fixed-cta {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px calc(14px + env(safe-area-inset-bottom));
  background: rgba(13,13,13,0.95);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-top: 1px solid rgba(255,255,255,0.06);
  transform: translateY(100%);
  transition: transform 0.4s var(--ease-out-expo);
}
.fixed-cta.show { transform: translateY(0); }

.fixed-cta__text {
  font-size: 14px;
  color: var(--c-white-50);
}
.fixed-cta__text strong {
  color: var(--c-orange);
  font-size: 16px;
}

.fixed-cta__btn {
  flex-shrink: 0;
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  color: var(--c-white);
  background: var(--g-orange);
  padding: 13px 28px;
  border-radius: var(--r-full);
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-glow);
  transition: all 0.25s var(--ease-out-expo);
}
.fixed-cta__btn:active { transform: scale(0.95); }


/* ================================
   返回顶部
   ================================ */
.backtop {
  position: fixed;
  bottom: 84px; right: 20px;
  z-index: 80;
  width: 46px; height: 46px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(13,13,13,0.85);
  backdrop-filter: blur(12px);
  color: var(--c-white-50);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all 0.3s var(--ease-out-expo);
}
.backtop.show {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.backtop:active { transform: scale(0.9); }
.backtop svg { width: 20px; height: 20px; }


/* ================================
   滚动渐显动画
   ================================ */
[data-animate] {
  opacity: 0;
  transform: translateY(36px);
  transition:
    opacity 0.7s var(--ease-out-expo),
    transform 0.7s var(--ease-out-expo);
}
[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}


/* ================================
   响应式 · 平板 (640+)
   ================================ */
@media (min-width: 640px) {
  .nav__links { display: flex; }
  .nav__burger { display: none; }
  .hero__content { padding: 0 40px; }
  .hero__main { max-width: 720px; }
  .hero__actions { flex-direction: row; justify-content: center; }
  .hero__stat-divider { height: 44px; }
  .bento-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
  }
  .bento--lg { grid-column: span 2; }
  .bento--wide { grid-column: span 3; }
  .stats-grid { grid-template-columns: repeat(4, 1fr); }
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .cta-wrap { flex-direction: row; text-align: left; }
  .cta-content { text-align: left; max-width: 420px; }
  .cta-checklist { margin: 0; }
  .fixed-cta { display: none; }
  .backtop { bottom: 32px; }
  .footer__top {
    flex-direction: row;
    justify-content: space-between;
  }
}


/* ================================
   响应式 · 桌面 (960+)
   ================================ */
@media (min-width: 960px) {
  :root { --container: 1080px; }

  /* Hero 双栏 */
  .hero { padding: 140px 0 120px; }
  .hero__content {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    text-align: left;
    gap: 36px;
  }
  .hero__main {
    max-width: 460px;
    text-align: left;
  }
  .hero__tag { margin-bottom: 28px; }
  .hero__title { margin-bottom: 18px; }
  .hero__subtitle { margin-bottom: 20px; }
  .hero__desc { margin-bottom: 34px; }
  .hero__stats {
    justify-content: flex-start;
    margin-bottom: 38px;
  }
  .hero__actions {
    flex-direction: row;
    justify-content: flex-start;
  }
  .hero__side { display: block; flex: 0 0 40%; max-width: 440px; }
  .hero__side-card { padding: 28px; }
  .hero__side-header { padding: 18px 20px; }
  .hero__side-body { padding: 0 20px 20px 64px; }

  .hero__stats { gap: 28px; padding: 24px 40px; }
  .hero__stat-num { font-size: 2.2rem; }
  .hero__stat-divider { height: 48px; }
  .accordion { max-width: 900px; }
  .acc-header { padding: 26px 32px; }
  .acc-body { padding: 0 32px 28px 88px; }
  .timeline { max-width: 800px; }
  .timeline::before { left: 31px; }
  .tl-inner { width: 62px; height: 62px; }
  .tl-icon { width: 28px; height: 28px; }
  .tl-item { gap: 28px; padding-bottom: 44px; }
  .bento-grid { grid-template-columns: repeat(4, 1fr); gap: 16px; }
  .bento { padding: 32px 24px; }
  .bento--lg { grid-column: span 2; grid-row: span 2; padding: 44px 36px; }
  .bento--lg .bento__icon { width: 88px; height: 88px; }
  .bento--highlight { grid-column: span 2; }
  .bento--wide { grid-column: span 2; }
  .cases-grid { grid-template-columns: repeat(3, 1fr); }
  .projects-grid { grid-template-columns: repeat(3, 1fr); }
  .faq-grid { grid-template-columns: repeat(2, 1fr); max-width: 1100px; }
  .cta-content { max-width: 520px; }
  .cta-title { font-size: clamp(1.8rem, 4vw, 2.6rem); }
}

/* 更大桌面屏 (1280+) */
@media (min-width: 1280px) {
  :root { --container: 1240px; }

  .hero__content { gap: 60px; }
  .hero__main { max-width: 580px; }
  .hero__side { flex: 0 0 44%; max-width: 520px; }
  .hero__side-card { padding: 40px; }
  .hero__side-header { padding: 22px 24px; }
  .hero__side-body { padding: 0 24px 24px 72px; }
  .hero__title-line { font-size: clamp(3.2rem, 5vw, 5.2rem); }
  .hero__stats { gap: 36px; padding: 26px 44px; }

  .accordion { max-width: 1000px; }
  .timeline { max-width: 900px; }
  .bento-grid { gap: 20px; }
  .bento { padding: 36px 28px; }
  .bento--lg { padding: 52px 40px; }
  .bento--lg .bento__icon { width: 100px; height: 100px; }
  .cta-wrap { gap: 52px; }
  .cta-content { max-width: 580px; }
}


/* ================================
   无障碍：减少动画
   ================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  [data-animate] {
    opacity: 1;
    transform: none;
  }
}


/* ================================
   项目管理后台
   ================================ */
.admin-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  vertical-align: middle;
  width: 10px; height: 10px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.08);
  cursor: pointer;
  margin-left: 6px;
  opacity: 0.9;
  transition: all 0.25s var(--ease-out-expo);
}
.admin-trigger:hover {
  background: var(--c-orange);
  box-shadow: 0 0 16px rgba(255,107,53,0.5);
  transform: scale(1.3);
}

.admin-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0,0,0,0.75);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s var(--ease-out-expo);
}
.admin-overlay.is-visible {
  opacity: 1;
  visibility: visible;
}

.admin-modal {
  background: var(--c-card-dark);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--r-xl);
  width: 100%;
  max-width: 400px;
  padding: 28px;
  transform: translateY(16px) scale(0.98);
  transition: all 0.3s var(--ease-out-expo);
}
.admin-overlay.is-visible .admin-modal {
  transform: translateY(0) scale(1);
}
.admin-modal--wide { max-width: 760px; }

.admin-panel-body {
  display: flex;
  gap: 24px;
  max-height: 54vh;
  min-height: 320px;
}
.admin-panel-col {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.admin-panel-col:first-child {
  border-right: 1px solid rgba(255,255,255,0.06);
  padding-right: 24px;
}
.admin-panel-col .admin-form {
  overflow-y: auto;
  padding-right: 6px;
}
.admin-panel-col .admin-project-list {
  flex: 1;
  max-height: none;
  overflow-y: auto;
  padding-right: 6px;
}
.admin-panel-col .admin-form__title {
  margin-bottom: 14px;
  flex-shrink: 0;
}

.admin-modal__title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--c-white);
  margin-bottom: 20px;
}

.admin-input {
  width: 100%;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--c-white-90);
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--r-md);
  padding: 12px 14px;
  margin-bottom: 12px;
  outline: none;
  transition: all 0.25s var(--ease-out-expo);
}
.admin-input::placeholder { color: var(--c-white-30); }
.admin-input:focus {
  border-color: var(--c-orange);
  background: rgba(255,255,255,0.06);
}
.admin-input.is-error {
  border-color: #ef4444;
  animation: shake 0.4s var(--ease-out-expo);
}
.admin-input--area {
  resize: vertical;
  min-height: 80px;
}
select.admin-input {
  color: var(--c-white-70);
  cursor: pointer;
}

.admin-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 8px;
}

.admin-btn {
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  padding: 10px 18px;
  border-radius: var(--r-md);
  border: none;
  cursor: pointer;
  transition: all 0.25s var(--ease-out-expo);
}
.admin-btn--primary {
  color: var(--c-white);
  background: var(--g-orange);
}
.admin-btn--primary:hover { filter: brightness(1.1); }
.admin-btn--secondary {
  color: var(--c-white-70);
  background: rgba(255,255,255,0.06);
}
.admin-btn--secondary:hover { background: rgba(255,255,255,0.1); }
.admin-btn--danger {
  color: #ef4444;
  background: rgba(239,68,68,0.08);
  border: 1px solid rgba(239,68,68,0.15);
  padding: 6px 12px;
  font-size: 0.8rem;
}
.admin-btn--danger:hover {
  background: rgba(239,68,68,0.15);
}

.admin-divider {
  height: 1px;
  background: rgba(255,255,255,0.06);
  margin: 20px 0;
}

.admin-form__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-white-90);
  margin-bottom: 12px;
}

.admin-project-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 220px;
  overflow-y: auto;
  padding-right: 6px;
}
.admin-project-list::-webkit-scrollbar { width: 4px; }
.admin-project-list::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.1);
  border-radius: var(--r-full);
}

.admin-project-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--r-md);
}
.admin-project-item strong {
  display: block;
  font-size: 0.95rem;
  color: var(--c-white);
  margin-bottom: 2px;
}
.admin-project-status {
  font-size: 0.75rem;
  color: var(--c-white-40);
}

.admin-file {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  margin-bottom: 12px;
  background: rgba(255,255,255,0.03);
  border: 1px dashed rgba(255,255,255,0.12);
  border-radius: var(--r-md);
  cursor: pointer;
  transition: all 0.25s var(--ease-out-expo);
}
.admin-file:hover {
  border-color: var(--c-orange);
  background: rgba(255,107,53,0.04);
}
.admin-file__input {
  position: absolute;
  width: 1px; height: 1px;
  opacity: 0;
  overflow: hidden;
}
.admin-file__btn {
  flex-shrink: 0;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--c-white);
  background: var(--g-orange);
  padding: 8px 14px;
  border-radius: var(--r-md);
}
.admin-file__name {
  font-size: 0.85rem;
  color: var(--c-white-40);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.admin-qr-preview {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  min-height: 80px;
}
.admin-qr-preview img {
  width: 80px; height: 80px;
  object-fit: contain;
  border-radius: var(--r-sm);
  border: 1px solid rgba(255,255,255,0.08);
  background: var(--c-white);
  padding: 4px;
}
.admin-btn--small {
  padding: 6px 12px;
  font-size: 0.8rem;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}

/* 编辑模式按钮样式 */

@media (max-width: 640px) {
  .admin-panel-body {
    flex-direction: column;
    gap: 18px;
    max-height: none;
    min-height: auto;
  }
  .admin-panel-col:first-child {
    border-right: none;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    padding-right: 0;
    padding-bottom: 18px;
  }
  .admin-panel-col .admin-project-list {
    max-height: 180px;
    flex: none;
  }
  .admin-panel-col .admin-form {
    overflow-y: visible;
  }
}

@media (max-width: 480px) {
  .admin-modal { padding: 22px; }
  .admin-overlay { padding: 16px; }
}

/* ========== 管理面板 Tab 切换 ========== */
.admin-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 20px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding-bottom: 12px;
}
.admin-tab {
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--c-white-50);
  background: transparent;
  border: none;
  padding: 8px 18px;
  cursor: pointer;
  position: relative;
  transition: all 0.25s var(--ease-out-expo);
}
.admin-tab.active {
  color: var(--c-orange);
}
.admin-tab.active::after {
  content: '';
  position: absolute;
  bottom: -13px; left: 0; right: 0;
  height: 2px;
  background: var(--c-orange);
  border-radius: var(--r-full);
}
.admin-tab:hover:not(.active) {
  color: var(--c-white-80);
}
.admin-tab-content {
  display: none;
}
.admin-tab-content.active {
  display: block;
}

/* 项目列表操作按钮组 */
.admin-project-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

/* 编辑模式按钮样式 */
.btn.is-editing {
  background: linear-gradient(135deg, #60A5FA, #3B82F6);
  box-shadow: 0 4px 20px rgba(59,130,246,0.3);
}

/* ========== FAQ 二维码管理区 ========== */
.admin-faq-section {
  max-height: 52vh;
  overflow-y: auto;
  padding-right: 6px;
}
.admin-faq-hint {
  font-size: 0.85rem;
  color: var(--c-white-40);
  margin-bottom: 18px;
}
.admin-faq-qrs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 10px;
}
.admin-faq-qr-item {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--r-md);
  padding: 14px;
}
.admin-faq-qr-item .admin-file {
  margin-bottom: 10px;
}
.admin-faq-qr-item .admin-input {
  margin-bottom: 0;
}

/* ========== 页面 FAQ 二维码展示 ========== */
.faq-qr-container {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.faq-qr-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.faq-qr-item img {
  width: 195px;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  border-radius: var(--r-md);
  border: 1px solid rgba(255,255,255,0.08);
  background: var(--c-white);
  padding: 8px;
  filter: brightness(0.7);
}
.faq-qr-item span {
  font-size: 1rem;
  color: var(--c-white-50);
  font-weight: 600;
}

/* ===== 提交项目 ===== */
.section--submit {
  background: var(--c-dark-2);
}
.submit-form {
  background: linear-gradient(135deg, #0D0D0D, #151515);
  border: 1px solid var(--c-border-light);
  border-radius: var(--r-lg);
  padding: clamp(28px, 4vw, 44px);
  max-width: 680px;
  margin: 0 auto;
}
.submit-form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 14px;
}
.submit-form__field {
  display: flex;
  flex-direction: column;
}
.submit-form__field + .submit-form__field {
  margin-top: 14px;
}
.submit-form__row .submit-form__field + .submit-form__field {
  margin-top: 0;
}
.submit-form__field .submit-input {
  flex: 1;
  min-height: 48px;
}
.submit-input {
  font-family: inherit;
  font-size: 0.95rem;
  line-height: 1.5;
  min-height: 48px;
  background: var(--c-dark-3);
  border: 1px solid var(--c-border-light);
  border-radius: var(--r-sm);
  padding: 13px 16px;
  color: var(--c-white);
  width: 100%;
  box-sizing: border-box;
  transition: border-color 0.25s;
  outline: none;
}
.submit-input:focus { border-color: var(--c-orange); }
.submit-input--area { resize: vertical; min-height: 100px; }
.submit-input--area + .submit-input { margin-top: 14px; }
.submit-input + .submit-input { margin-top: 14px; }
.submit-form__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 20px;
}
.submit-form__hint {
  font-size: 0.85rem;
  color: var(--c-white-40);
  margin: 0;
}
.submit-file {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  margin: 6px 0 4px;
  cursor: pointer;
}
.submit-file__input { display: none; }
.submit-file__btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--c-orange);
  background: rgba(255,107,53,0.08);
  border: 1px dashed rgba(255,107,53,0.25);
  border-radius: var(--r-sm);
  padding: 10px 20px;
  transition: all 0.25s;
}
.submit-file__btn:hover {
  background: rgba(255,107,53,0.14);
  border-color: var(--c-orange);
}
.submit-file__hint {
  font-size: 0.78rem;
  color: var(--c-white-30);
}
.submit-file__preview {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}
.submit-file__preview-item {
  position: relative;
  width: 64px; height: 64px;
  border-radius: var(--r-sm);
  overflow: hidden;
  border: 1px solid var(--c-border-light);
  background: var(--c-dark-3);
  display: flex;
  align-items: center;
  justify-content: center;
}
.submit-file__preview-item img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.submit-file__preview-item .file-icon {
  font-size: 1.6rem;
  color: var(--c-white-40);
}
.submit-file__preview-remove {
  position: absolute;
  top: -4px; right: -4px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--c-danger, #ef4444);
  color: #fff;
  border: none;
  font-size: 12px;
  line-height: 18px;
  text-align: center;
  cursor: pointer;
  padding: 0;
}
.submit-form__success {
  text-align: center;
  padding: 28px;
}
.submit-form__success svg {
  width: 56px; height: 56px;
  color: var(--c-orange);
  margin-bottom: 14px;
}
.submit-form__success h3 {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--c-white);
  margin-bottom: 8px;
}
.submit-form__success p {
  color: var(--c-white-50);
  font-size: 0.95rem;
}
@media (max-width: 640px) {
  .submit-form__row { grid-template-columns: 1fr; }
  .submit-form__footer { flex-direction: column; text-align: center; }
}

/* ===== 项目筛选 ===== */
.projects-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
  justify-content: center;
}
.projects-filter__btn {
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--c-white-50);
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  padding: 8px 18px;
  border-radius: var(--r-full);
  cursor: pointer;
  transition: all 0.25s var(--ease-out-expo);
}
.projects-filter__btn:hover {
  color: var(--c-white);
  background: rgba(255,255,255,0.08);
}
.projects-filter__btn.active {
  color: var(--c-white);
  background: var(--g-orange);
  border-color: transparent;
}

/* ===== Admin: 提交审核面板 ===== */
.admin-submissions-list {
  max-height: 40vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.admin-submission-item {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--r-sm);
  padding: 14px 16px;
}
.admin-submission__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}
.admin-submission__header strong {
  font-size: 1rem;
  color: var(--c-white);
}
.admin-submission__meta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 0.8rem;
  color: var(--c-white-40);
  margin-bottom: 8px;
}
.admin-submission__desc {
  font-size: 0.88rem;
  color: var(--c-white-60);
  line-height: 1.6;
  margin-bottom: 10px;
}
.admin-submission__actions {
  display: flex;
  gap: 8px;
}
@media (max-width: 640px) {
  .admin-faq-qrs { grid-template-columns: 1fr; }
  .faq-qr-container { flex-direction: column; gap: 20px; align-items: center; }
  .tl-illustration { display: none; }
}

/* ===== 点子堆 · 标签贴墙 ===== */
.section--ideas {
  padding: 80px 0;
  position: relative;
  overflow: hidden;
}

.idea-wall {
  position: relative;
  width: 100%;
  margin-top: 40px;
}

.idea-wall__surface {
  position: relative;
  width: 100%;
  min-height: 480px;
  padding: 20px;
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
  gap: 0;
  justify-content: center;
}

/* ---- 标签贴 ---- */
.idea-tag:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 8px 24px rgba(0,0,0,0.35);
  z-index: 10;
}

@keyframes tagEnter {
  0% { opacity: 0; transform: scale(0.5); }
  100% { opacity: 1; transform: scale(1); }
}

.idea-tag {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  margin: 4px 6px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  user-select: none;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  border: 1px solid rgba(255,255,255,0.08);
  z-index: 1;
  animation: tagEnter 0.4s ease both;
  will-change: transform;
}

/* 标签风格变体 */
.idea-tag--style0 { border-radius: 8px; }                              /* 圆角简约 */
.idea-tag--style1 { border-radius: 4px 12px 4px 12px; }               /* 波浪异形 */
.idea-tag--style2 { border-radius: 12px 4px; }                        /* 反向波浪 */
.idea-tag--style3 { border-radius: 4px; border-left: 3px solid; }     /* 左侧粗边 */
.idea-tag--style4 { border-radius: 8px; border-bottom: 3px solid; }   /* 底部粗边 */
.idea-tag--style5 { border-radius: 12px; background: transparent !important; border-width: 2px; } /* 镂空 */

/* 标签颜色主题（覆盖 inline bg） */
.idea-tag--c0 { background: linear-gradient(135deg, #FF6B35, #FF8C42); color: #fff; }
.idea-tag--c1 { background: linear-gradient(135deg, #FF4500, #FF6347); color: #fff; }
.idea-tag--c2 { background: linear-gradient(135deg, #7C3AED, #A855F7); color: #fff; }
.idea-tag--c3 { background: linear-gradient(135deg, #059669, #34D399); color: #fff; }
.idea-tag--c4 { background: linear-gradient(135deg, #2563EB, #60A5FA); color: #fff; }
.idea-tag--c5 { background: linear-gradient(135deg, #D97706, #FBBF24); color: #fff; }
.idea-tag--c6 { background: linear-gradient(135deg, #DB2777, #F472B6); color: #fff; }
.idea-tag--c7 { background: linear-gradient(135deg, #1D4ED8, #6366F1); color: #fff; }
.idea-tag--c8 { border: 1px solid rgba(255,107,53,0.4); background: rgba(255,107,53,0.08); color: #FF8C42; }
.idea-tag--c9 { border: 1px solid rgba(255,255,255,0.15); background: rgba(255,255,255,0.05); color: #e0e0e0; }

/* 系统精选标识 */
.idea-tag__badge {
  font-size: 10px;
  color: #FFD700;
  text-shadow: 0 0 4px rgba(255,215,0,0.5);
  flex-shrink: 0;
}

/* ---- 标签展开弹窗 ---- */
.idea-tag-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  padding: 20px;
}

.idea-tag-overlay.active {
  opacity: 1;
  visibility: visible;
}

.idea-tag-expanded {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px;
  max-width: 520px;
  width: 100%;
  position: relative;
  transform: scale(0.9) translateY(20px);
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.idea-tag-overlay.active .idea-tag-expanded {
  transform: scale(1) translateY(0);
}

.idea-tag-expanded__close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 24px;
  cursor: pointer;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  transition: all 0.2s;
}

.idea-tag-expanded__close:hover {
  background: var(--border);
  color: var(--text);
}

.idea-tag-expanded__badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: #FFD700;
  margin-bottom: 12px;
}

.idea-tag-expanded__title {
  font-size: 24px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 12px;
  color: var(--text);
}

.idea-tag-expanded__content {
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.idea-tag-expanded__actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.idea-tag-expanded__actions .btn {
  font-size: 13px;
}

/* ---- 统计条 ---- */
.idea-wall__stats {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 28px;
  font-size: 13px;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

/* ---- 移动端 ---- */
@media (max-width: 640px) {
  .idea-wall__surface {
    min-height: 360px;
    padding: 12px;
  }
  .idea-tag {
    padding: 6px 12px;
    font-size: 12px;
    margin: 3px 4px;
  }
  .idea-tag-expanded {
    padding: 28px 24px;
  }
  .idea-tag-expanded__title {
    font-size: 20px;
  }
  .idea-wall__stats {
    gap: 12px;
  }
}