/* ============================================================
   昆山小乙无人机培训学院 - 视觉设计系统
   风格：科技深色 · 沉浸大气
   ============================================================ */

/* ---------- 设计令牌 (Design Tokens) ---------- */
:root {
  /* 主色板 - 科技深色 */
  --color-bg:          #0A0E1A;   /* 主背景 近黑深蓝 */
  --color-bg-soft:     #111729;   /* 次背景 卡片底 */
  --color-bg-elevated: #161D33;   /* 抬升层 卡片hover */
  --color-surface:     #1C2440;   /* 表层 */
  --color-border:      rgba(255,255,255,0.08);
  --color-border-strong: rgba(255,255,255,0.16);

  /* 品牌色 */
  --color-primary:     #00D4FF;   /* 科技青 主色 */
  --color-primary-dark:#0099CC;
  --color-primary-glow:rgba(0,212,255,0.35);
  --color-accent:      #FF6B35;   /* 活力橙 CTA */
  --color-accent-dark: #E5511E;

  /* 文字色 */
  --color-text:        #FFFFFF;
  --color-text-muted:  #A0AABF;   /* 次要文字 */
  --color-text-dim:    #6B7593;   /* 辅助说明 */

  /* 功能色 */
  --color-success:     #00E5A0;
  --color-warning:     #FFB800;

  /* 字体 */
  --font-sans: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Helvetica Neue", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", Consolas, monospace;

  /* 字号 */
  --fs-hero:    clamp(2.5rem, 6vw, 5rem);
  --fs-h1:      clamp(2rem, 4vw, 3.25rem);
  --fs-h2:      clamp(1.75rem, 3vw, 2.5rem);
  --fs-h3:      clamp(1.25rem, 2vw, 1.625rem);
  --fs-lead:    clamp(1.05rem, 1.5vw, 1.25rem);
  --fs-body:    1rem;
  --fs-sm:      0.875rem;
  --fs-xs:      0.75rem;

  /* 间距 */
  --space-section: clamp(4rem, 8vw, 7rem);
  --space-block:   clamp(2rem, 4vw, 3.5rem);

  /* 圆角 */
  --radius-sm: 8px;
  --radius:    14px;
  --radius-lg: 20px;
  --radius-pill: 999px;

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow:    0 8px 30px rgba(0,0,0,0.4);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 40px var(--color-primary-glow);

  /* 过渡 */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --t-fast: 0.2s var(--ease);
  --t: 0.35s var(--ease);
  --t-slow: 0.6s var(--ease-out);

  /* 容器宽度 */
  --container: 1240px;
  --container-narrow: 880px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  overflow-x: hidden;
}

/* 全局背景纹理 - 极细网格 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 0%, rgba(0,212,255,0.06), transparent 50%),
    radial-gradient(circle at 80% 100%, rgba(255,107,53,0.04), transparent 50%);
  pointer-events: none;
  z-index: 0;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--t-fast); }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul, ol { list-style: none; }

/* ---------- 排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

p { color: var(--color-text-muted); }
strong { color: var(--color-text); font-weight: 600; }

/* ---------- 容器与栅格 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
  position: relative;
  z-index: 1;
}
.container-narrow { max-width: var(--container-narrow); }

.section {
  padding-block: var(--space-section);
  position: relative;
}
.section--tight { padding-block: var(--space-block); }

/* 区块标题组件 */
.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto clamp(2.5rem, 5vw, 4rem);
}
.section-head--left { text-align: left; margin-inline: 0; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-primary);
  padding: 6px 14px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-pill);
  background: rgba(0,212,255,0.05);
  margin-bottom: 20px;
}
.eyebrow::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 12px var(--color-primary);
}

.section-title {
  font-size: var(--fs-h2);
  margin-bottom: 16px;
}
.section-title .accent { color: var(--color-primary); }

.section-desc {
  font-size: var(--fs-lead);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  font-size: var(--fs-body);
  font-weight: 600;
  border-radius: var(--radius-pill);
  transition: all var(--t);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}
.btn svg { width: 18px; height: 18px; }

.btn--primary {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
  color: #fff;
  box-shadow: 0 8px 24px rgba(255,107,53,0.35);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(255,107,53,0.5);
}

.btn--ghost {
  background: rgba(255,255,255,0.04);
  color: var(--color-text);
  border: 1px solid var(--color-border-strong);
  backdrop-filter: blur(10px);
}
.btn--ghost:hover {
  background: rgba(0,212,255,0.1);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn--link {
  padding: 4px 0;
  color: var(--color-primary);
  font-weight: 500;
}
.btn--link::after {
  content: "→";
  transition: transform var(--t-fast);
}
.btn--link:hover::after { transform: translateX(4px); }

.btn--lg { padding: 18px 36px; font-size: 1.05rem; }

/* ---------- 顶部导航 ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding-block: 18px;
  transition: all var(--t);
  background: linear-gradient(180deg, rgba(10,14,26,0.85), transparent);
  backdrop-filter: blur(0);
}
.nav.scrolled {
  padding-block: 12px;
  background: rgba(10,14,26,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}
.nav__inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}
.logo__mark {
  width: 42px; height: 42px;
  display: grid; place-items: center;
  flex-shrink: 0;
  overflow: hidden;
  border-radius: 10px;
}
/* logo 图片样式 */
.logo__img {
  width: 42px; height: 42px;
  object-fit: contain;
  filter: brightness(0) invert(1); /* 兜底：确保深色背景上可见 */
}
/* 如果图片本身是透明底白色 logo，去掉滤镜 */
.logo__img[src*="logo-light"] {
  filter: none;
}
.logo__mark svg { width: 24px; height: 24px; }
.logo__text small {
  display: block;
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--color-text-dim);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav__menu a {
  padding: 8px 16px;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  border-radius: var(--radius-pill);
  font-weight: 500;
}
.nav__menu a:hover { color: var(--color-text); background: rgba(255,255,255,0.05); }
.nav__menu a.active { color: var(--color-primary); }

.nav__actions { display: flex; align-items: center; gap: 12px; }
.nav__phone {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  display: flex; align-items: center; gap: 8px;
}
.nav__phone svg { width: 16px; height: 16px; color: var(--color-primary); }

.nav__toggle {
  display: none;
  width: 44px; height: 44px;
  border-radius: 10px;
  border: 1px solid var(--color-border-strong);
  align-items: center; justify-content: center;
}
.nav__toggle span {
  width: 18px; height: 2px; background: var(--color-text);
  position: relative;
  transition: all var(--t);
}
.nav__toggle span::before,
.nav__toggle span::after {
  content: ""; position: absolute; left: 0;
  width: 18px; height: 2px; background: var(--color-text);
  transition: all var(--t);
}
.nav__toggle span::before { top: -6px; }
.nav__toggle span::after { top: 6px; }
.nav__toggle.open span { background: transparent; }
.nav__toggle.open span::before { top: 0; transform: rotate(45deg); }
.nav__toggle.open span::after { top: 0; transform: rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 100px;
  overflow: hidden;
}
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero__bg img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center;
}
.hero__bg::after {
  content: "";
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(10,14,26,0.65) 0%, rgba(10,14,26,0.45) 40%, var(--color-bg) 100%),
    linear-gradient(90deg, rgba(10,14,26,0.85) 0%, transparent 60%);
}
.hero__inner {
  position: relative;
  z-index: 2;
  max-width: 880px;
  padding-block: 4rem 6rem;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-pill);
  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(10px);
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin-bottom: 28px;
}
.hero__badge .dot {
  width: 8px; height: 8px;
  background: var(--color-success);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-success);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero__title {
  font-size: var(--fs-hero);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}
.hero__title .line { display: block; }
.hero__title .grad {
  background: linear-gradient(135deg, var(--color-primary) 0%, #7BEDFF 50%, var(--color-primary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__desc {
  font-size: var(--fs-lead);
  color: var(--color-text-muted);
  max-width: 640px;
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 56px;
}

.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}
.hero__stat .num {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 800;
  color: var(--color-text);
  line-height: 1;
}
.hero__stat .num .unit {
  font-size: 0.5em;
  color: var(--color-primary);
  margin-left: 4px;
}
.hero__stat .label {
  font-size: var(--fs-sm);
  color: var(--color-text-dim);
  margin-top: 8px;
}

.hero__scroll {
  position: absolute;
  bottom: 32px; left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  font-size: var(--fs-xs);
  color: var(--color-text-dim);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
}
.hero__scroll .mouse {
  width: 24px; height: 38px;
  border: 2px solid var(--color-border-strong);
  border-radius: var(--radius-pill);
  position: relative;
}
.hero__scroll .mouse::before {
  content: ""; position: absolute;
  top: 8px; left: 50%;
  width: 3px; height: 8px;
  background: var(--color-primary);
  border-radius: var(--radius-pill);
  transform: translateX(-50%);
  animation: scroll-dot 1.8s infinite;
}
@keyframes scroll-dot {
  0% { opacity: 0; transform: translate(-50%, 0); }
  40% { opacity: 1; }
  100% { opacity: 0; transform: translate(-50%, 14px); }
}

/* ---------- 卡片 ---------- */
.card {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--t);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
  opacity: 0;
  transition: opacity var(--t);
}
.card:hover {
  background: var(--color-bg-elevated);
  border-color: var(--color-border-strong);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.card:hover::before { opacity: 1; }

.card__icon {
  width: 56px; height: 56px;
  display: grid; place-items: center;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(0,212,255,0.15), rgba(0,212,255,0.05));
  border: 1px solid rgba(0,212,255,0.2);
  margin-bottom: 24px;
  color: var(--color-primary);
}
.card__icon svg { width: 28px; height: 28px; }
.card__title {
  font-size: var(--fs-h3);
  margin-bottom: 12px;
}
.card__desc {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* 网格布局 */
.grid { display: grid; gap: 24px; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- 课程卡 ---------- */
.course-card {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--t);
  display: flex;
  flex-direction: column;
}
.course-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow);
}
.course-card__media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
}
.course-card__media img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform var(--t-slow);
}
.course-card:hover .course-card__media img { transform: scale(1.08); }
.course-card__media::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(10,14,26,0.9));
}
.course-card__tag {
  position: absolute;
  top: 16px; left: 16px;
  z-index: 2;
  padding: 6px 12px;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  border-radius: var(--radius-pill);
  background: rgba(0,212,255,0.15);
  border: 1px solid rgba(0,212,255,0.3);
  color: var(--color-primary);
  backdrop-filter: blur(10px);
}
.course-card__tag--hot {
  background: rgba(255,107,53,0.15);
  border-color: rgba(255,107,53,0.3);
  color: var(--color-accent);
}
.course-card__body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.course-card__title {
  font-size: 1.25rem;
  margin-bottom: 8px;
}
.course-card__sub {
  font-size: var(--fs-sm);
  color: var(--color-text-dim);
  margin-bottom: 16px;
}
.course-card__features {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
  flex: 1;
}
.course-card__features li {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  display: flex;
  align-items: flex-start;
  gap: 8px;
}
.course-card__features li::before {
  content: "✓";
  color: var(--color-primary);
  font-weight: 700;
  flex-shrink: 0;
}
.course-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}
.course-card__price {
  display: flex;
  flex-direction: column;
}
.course-card__price .label {
  font-size: var(--fs-xs);
  color: var(--color-text-dim);
}
.course-card__price .val {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
  font-family: var(--font-display);
}
.course-card__price .val small {
  font-size: 0.7em;
  color: var(--color-text-dim);
  font-weight: 400;
}

/* ---------- 时间线（培训流程） ---------- */
.timeline {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0;
  position: relative;
}
.timeline::before {
  content: "";
  position: absolute;
  top: 28px; left: 8%; right: 8%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), rgba(0,212,255,0.2));
}
.timeline__step {
  text-align: center;
  padding: 0 8px;
  position: relative;
}
.timeline__num {
  width: 56px; height: 56px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-primary);
  display: grid; place-items: center;
  font-weight: 700;
  color: var(--color-primary);
  position: relative;
  z-index: 2;
  box-shadow: 0 0 0 6px var(--color-bg), 0 0 20px var(--color-primary-glow);
}
.timeline__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
}
.timeline__desc {
  font-size: var(--fs-xs);
  color: var(--color-text-dim);
  line-height: 1.5;
}

/* ---------- 师资卡 ---------- */
.teacher-card {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--t);
}
.teacher-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow);
}
.teacher-card__photo {
  aspect-ratio: 3 / 4;
  overflow: hidden;
  position: relative;
}
.teacher-card__photo img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: grayscale(0.2);
  transition: all var(--t-slow);
}
.teacher-card:hover .teacher-card__photo img { filter: grayscale(0); transform: scale(1.05); }
.teacher-card__photo::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(10,14,26,0.95));
}
.teacher-card__badge {
  position: absolute;
  top: 16px; right: 16px;
  padding: 4px 10px;
  font-size: var(--fs-xs);
  border-radius: var(--radius-pill);
  background: rgba(0,212,255,0.2);
  border: 1px solid rgba(0,212,255,0.4);
  color: var(--color-primary);
  backdrop-filter: blur(10px);
  z-index: 2;
}
.teacher-card__info {
  padding: 20px 24px 24px;
  margin-top: -50px;
  position: relative;
  z-index: 2;
}
.teacher-card__name {
  font-size: 1.25rem;
  margin-bottom: 4px;
}
.teacher-card__role {
  font-size: var(--fs-sm);
  color: var(--color-primary);
  margin-bottom: 12px;
}
.teacher-card__bio {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ---------- 数据条 ---------- */
.stat-bar {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  position: relative;
  overflow: hidden;
}
.stat-bar::before {
  content: "";
  position: absolute;
  top: -50%; right: -10%;
  width: 400px; height: 400px;
  background: radial-gradient(circle, var(--color-primary-glow), transparent 70%);
  opacity: 0.5;
  pointer-events: none;
}
.stat-bar__item {
  text-align: center;
  position: relative;
  z-index: 1;
}
.stat-bar__num {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3vw, 2.75rem);
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-bar__num .unit {
  font-size: 0.5em;
  color: var(--color-text);
}
.stat-bar__label {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

/* ---------- 图集 ---------- */
.gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(3, 200px);
  gap: 16px;
}
.gallery__item {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  cursor: pointer;
}
.gallery__item img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform var(--t-slow);
}
.gallery__item:hover img { transform: scale(1.1); }
.gallery__item::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(10,14,26,0.9));
  opacity: 0;
  transition: opacity var(--t);
}
.gallery__item:hover::after { opacity: 1; }
.gallery__item .cap {
  position: absolute;
  left: 16px; bottom: 16px;
  z-index: 2;
  font-size: var(--fs-sm);
  font-weight: 600;
  opacity: 0;
  transform: translateY(10px);
  transition: all var(--t);
}
.gallery__item:hover .cap { opacity: 1; transform: translateY(0); }

/* 显式定位 6 张图填满 4列×3行网格，0 空缺 */
/* 布局示意：
   ┌──────┬───────┴──────┬──────┐
   │      │   b(wide)    │  c   │ 行1
   │ a    ├──────┬───────┼──────┤
   │(tall)│  d   │  e(wide)    │ 行2
   ├──────┴──────┴─────────────┤
   │   f(wide 通栏 4列)        │ 行3
   └───────────────────────────┘           */
.gallery__item--a { grid-column: 1; grid-row: 1 / span 2; }   /* student-3 竖版大图 */
.gallery__item--b { grid-column: 2 / span 2; grid-row: 1; }   /* student-1 宽图 */
.gallery__item--c { grid-column: 4; grid-row: 1; }            /* student-5 方 */
.gallery__item--d { grid-column: 2; grid-row: 2; }            /* student-8 方 */
.gallery__item--e { grid-column: 3 / span 2; grid-row: 2; }   /* student-2 宽图 */
.gallery__item--f { grid-column: 1 / span 4; grid-row: 3; }   /* student-10 通栏 */

/* ---------- FAQ ---------- */
.faq {
  max-width: var(--container-narrow);
  margin-inline: auto;
}
.faq__item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  background: var(--color-bg-soft);
  overflow: hidden;
  transition: border-color var(--t);
}
.faq__item.open { border-color: var(--color-border-strong); }
.faq__q {
  width: 100%;
  text-align: left;
  padding: 22px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--color-text);
}
.faq__q .icon {
  width: 24px; height: 24px;
  flex-shrink: 0;
  display: grid; place-items: center;
  border-radius: 50%;
  background: rgba(0,212,255,0.1);
  color: var(--color-primary);
  transition: transform var(--t);
  font-size: 1.2rem;
}
.faq__item.open .faq__q .icon { transform: rotate(45deg); }
.faq__a {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--t-slow);
}
.faq__item.open .faq__a { max-height: 400px; }
.faq__a-inner {
  padding: 0 24px 24px;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* ---------- CTA 大横幅 ---------- */
.cta-banner {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  padding: clamp(3rem, 6vw, 5rem);
  background:
    linear-gradient(135deg, rgba(0,212,255,0.15), rgba(255,107,53,0.1)),
    linear-gradient(135deg, var(--color-bg-elevated), var(--color-bg-soft));
  border: 1px solid var(--color-border-strong);
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 48px;
  align-items: center;
}
.cta-banner::before {
  content: "";
  position: absolute;
  top: -100px; right: -100px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, var(--color-primary-glow), transparent 70%);
  pointer-events: none;
}
.cta-banner__title {
  font-size: var(--fs-h2);
  margin-bottom: 16px;
  position: relative;
}
.cta-banner__desc {
  color: var(--color-text-muted);
  margin-bottom: 28px;
  font-size: var(--fs-lead);
  position: relative;
}
.cta-banner__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  position: relative;
}
.cta-banner__contact {
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: relative;
  z-index: 1;
}
.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 20px;
  background: rgba(0,0,0,0.25);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}
.contact-item__icon {
  width: 44px; height: 44px;
  flex-shrink: 0;
  border-radius: 12px;
  background: rgba(0,212,255,0.1);
  display: grid; place-items: center;
  color: var(--color-primary);
}
.contact-item__icon svg { width: 22px; height: 22px; }
.contact-item__label {
  font-size: var(--fs-xs);
  color: var(--color-text-dim);
}
.contact-item__value {
  font-size: 1.05rem;
  font-weight: 600;
}

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-section);
  background: var(--color-bg);
  position: relative;
}
.footer__top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--color-border);
}
.footer__brand .logo { margin-bottom: 20px; }
.footer__about {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 24px;
}
.footer__col h4 {
  font-size: 1rem;
  margin-bottom: 20px;
  color: var(--color-text);
}
.footer__col ul { display: flex; flex-direction: column; gap: 12px; }
.footer__col a {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}
.footer__col a:hover { color: var(--color-primary); }

.footer__bottom {
  padding-block: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: var(--fs-sm);
  color: var(--color-text-dim);
}
.footer__bottom a:hover { color: var(--color-primary); }

/* ---------- 浮动咨询按钮 ---------- */
.float-consult {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.float-consult__btn {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border-strong);
  display: grid; place-items: center;
  color: var(--color-text);
  box-shadow: var(--shadow);
  transition: all var(--t);
  position: relative;
}
.float-consult__btn:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.float-consult__btn svg { width: 24px; height: 24px; }
.float-consult__btn--primary {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 8px 24px rgba(255,107,53,0.4);
}
.float-consult__btn--primary:hover { color: #fff; }
.float-consult__btn .tip {
  position: absolute;
  right: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border-strong);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: var(--fs-xs);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t-fast);
}
.float-consult__btn:hover .tip { opacity: 1; }

/* 弹窗 */
.modal {
  position: fixed; inset: 0;
  z-index: 200;
  display: none;
  align-items: center; justify-content: center;
  padding: 24px;
  background: rgba(10,14,26,0.8);
  backdrop-filter: blur(8px);
}
.modal.open { display: flex; }
.modal__panel {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  padding: 40px;
  max-width: 400px;
  width: 100%;
  text-align: center;
  position: relative;
  animation: modal-in var(--t-slow);
}
@keyframes modal-in {
  from { opacity: 0; transform: translateY(20px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.modal__close {
  position: absolute;
  top: 16px; right: 16px;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
  display: grid; place-items: center;
  font-size: 1.2rem;
}
.modal__close:hover { background: rgba(255,255,255,0.1); }
.modal__title { margin-bottom: 8px; }
.modal__desc { color: var(--color-text-muted); margin-bottom: 24px; font-size: var(--fs-sm); }
.modal__qr {
  width: 220px; height: 220px;
  margin: 0 auto 20px;
  background: #fff;
  border-radius: var(--radius);
  padding: 16px;
  display: grid; place-items: center;
}
.modal__qr img { width: 100%; height: 100%; object-fit: contain; }
.modal__hint { font-size: var(--fs-sm); color: var(--color-text-dim); }

/* ---------- 滚动入场动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}
.reveal[data-delay="1"] { transition-delay: 0.1s; }
.reveal[data-delay="2"] { transition-delay: 0.2s; }
.reveal[data-delay="3"] { transition-delay: 0.3s; }
.reveal[data-delay="4"] { transition-delay: 0.4s; }

/* ---------- 页面通用 Hero（内页） ---------- */
.page-hero {
  padding-top: 180px;
  padding-bottom: 80px;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}
.page-hero__bg {
  position: absolute; inset: 0; z-index: 0;
}
.page-hero__bg img { width: 100%; height: 100%; object-fit: cover; opacity: 0.3; }
.page-hero__bg::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(10,14,26,0.6), var(--color-bg));
}
.page-hero__inner { position: relative; z-index: 1; max-width: 760px; }
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-sm);
  color: var(--color-text-dim);
  margin-bottom: 20px;
}
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb .sep { opacity: 0.5; }
.page-hero__title {
  font-size: var(--fs-h1);
  margin-bottom: 16px;
}
.page-hero__desc {
  font-size: var(--fs-lead);
  color: var(--color-text-muted);
}

/* ---------- 内容详情排版 ---------- */
.prose { max-width: var(--container-narrow); margin-inline: auto; }
.prose h2 { font-size: var(--fs-h2); margin: 2.5rem 0 1rem; }
.prose h3 { font-size: var(--fs-h3); margin: 2rem 0 1rem; }
.prose p { margin-bottom: 1.25rem; line-height: 1.85; color: var(--color-text-muted); }
.prose ul { margin: 1rem 0 1.5rem; padding-left: 0; }
.prose ul li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 10px;
  color: var(--color-text-muted);
}
.prose ul li::before {
  content: ""; position: absolute;
  left: 0; top: 0.7em;
  width: 8px; height: 8px;
  border-radius: 2px;
  background: var(--color-primary);
}
.prose blockquote {
  margin: 1.5rem 0;
  padding: 20px 24px;
  border-left: 3px solid var(--color-primary);
  background: var(--color-bg-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--color-text);
}

/* ---------- 价格表 ---------- */
.price-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.price-table th, .price-table td {
  padding: 18px 24px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}
.price-table th {
  background: var(--color-bg-elevated);
  font-weight: 600;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}
.price-table tr:last-child td { border-bottom: none; }
.price-table tr:hover td { background: rgba(0,212,255,0.03); }
.price-table .price { color: var(--color-accent); font-weight: 700; }

/* ---------- 信息块（图文左右） ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.split__media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  aspect-ratio: 4 / 3;
}
.split__media img { width: 100%; height: 100%; object-fit: cover; }
.split__content .eyebrow { margin-bottom: 16px; }
.split__content h2 { margin-bottom: 20px; }
.split__content p { margin-bottom: 16px; }
.split__list {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.split__list li {
  display: flex;
  gap: 12px;
  font-size: var(--fs-body);
}
.split__list li .check {
  flex-shrink: 0;
  width: 24px; height: 24px;
  border-radius: 50%;
  background: rgba(0,212,255,0.15);
  color: var(--color-primary);
  display: grid; place-items: center;
  font-size: 0.8rem;
  margin-top: 2px;
}

/* ---------- 标签芯片 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  font-size: var(--fs-xs);
  border-radius: var(--radius-pill);
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}
.chip--primary {
  background: rgba(0,212,255,0.1);
  border-color: rgba(0,212,255,0.3);
  color: var(--color-primary);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .timeline { grid-template-columns: repeat(3, 1fr); gap: 32px 0; }
  .timeline::before { display: none; }
  .footer__top { grid-template-columns: 1fr 1fr; gap: 40px; }
  .cta-banner { grid-template-columns: 1fr; gap: 32px; }
  .gallery { grid-template-columns: repeat(3, 1fr); grid-template-rows: repeat(3, 180px); }
  /* 平板：重置显式定位，改为方格流式 */
  .gallery__item--a,
  .gallery__item--b,
  .gallery__item--c,
  .gallery__item--d,
  .gallery__item--e,
  .gallery__item--f { grid-column: auto; grid-row: auto; }
}

@media (max-width: 768px) {
  .nav__menu, .nav__phone { display: none; }
  .nav__toggle { display: flex; }
  .nav__menu.open {
    display: flex;
    position: absolute;
    top: 100%; left: 16px; right: 16px;
    flex-direction: column;
    align-items: stretch;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-lg);
    padding: 12px;
    gap: 4px;
    box-shadow: var(--shadow-lg);
  }
  .nav__menu.open a { padding: 12px 16px; }

  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .stat-bar { grid-template-columns: repeat(2, 1fr); padding: 28px; gap: 24px; }
  .timeline { grid-template-columns: repeat(2, 1fr); gap: 32px 16px; }
  .split { grid-template-columns: 1fr; gap: 32px; }
  .footer__top { grid-template-columns: 1fr; gap: 32px; }
  .gallery { grid-template-columns: repeat(2, 1fr); grid-template-rows: none; grid-auto-rows: 150px; }
  /* 手机：全部重置为方格，整齐 2 列 */
  .gallery__item--a,
  .gallery__item--b,
  .gallery__item--c,
  .gallery__item--d,
  .gallery__item--e,
  .gallery__item--f { grid-column: auto; grid-row: auto; }

  .hero__stats { gap: 24px; }
  .hero__stat { flex: 1 1 40%; }
  .float-consult { right: 16px; bottom: 16px; }
  .section { padding-block: clamp(3rem, 10vw, 4rem); }
}

@media (max-width: 480px) {
  .stat-bar { grid-template-columns: 1fr; }
  .hero__cta { flex-direction: column; align-items: stretch; }
  .hero__cta .btn { width: 100%; }
}

/* ---------- 工具类 ---------- */
.text-center { text-align: center; }
.text-primary { color: var(--color-primary); }
.text-accent { color: var(--color-accent); }
.mt-0 { margin-top: 0; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-0 { margin-bottom: 0; }
.hide-mobile { }
.show-mobile { display: none; }
@media (max-width: 768px) {
  .hide-mobile { display: none !important; }
  .show-mobile { display: block !important; }
}