/* ══════════════════════════════════════════════════════════════
   雨耕教育 · 书法古典风格样式
   配色：墨黑 #1A1A1A / 朱砂红 #C23A3A / 宣纸米 #F5F0E8 / 金色 #B8922A
   ══════════════════════════════════════════════════════════════ */

/* ── 变量 ─────────────────────────────────────────── */
:root {
  --black:    #1A1A1A;
  --vermilion:#C23A3A;
  --paper:    #F5F0E8;
  --gold:     #B8922A;
  --teal:     #2D5A5A;
  --moon:     #E8EFF2;
  --bronze:   #8B6914;
  --gray:     #4A4A4A;
  --line:     #D4CFC7;
  --white:    #FFFFFF;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "宋体", serif;
  color: var(--black);
  background: var(--paper);
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ── 容器 ─────────────────────────────────────────── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── 通用区块 ─────────────────────────────────────── */
.section {
  padding: 100px 0;
  position: relative;
}

/* ── 区块标签（壹·关于我们 等） ─────────────────── */
.section-tag {
  font-size: 13px;
  letter-spacing: 3px;
  color: var(--vermilion);
  text-align: center;
  margin-bottom: 12px;
  font-weight: 500;
}

.section-title {
  font-size: 36px;
  text-align: center;
  font-weight: 700;
  color: var(--black);
  margin-bottom: 16px;
}

.section-rule {
  width: 60px;
  height: 2px;
  background: var(--gold);
  margin: 0 auto 48px;
}

/* ══════════════════════════════════════════════════════
   导航栏
   ══════════════════════════════════════════════════════ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(26,26,26,0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(200,195,180,0.15);
  transition: background 0.3s;
}

.navbar.scrolled {
  background: rgba(26,26,26,0.97);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--paper);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 2px;
  flex-shrink: 0;
}

.logo-seal {
  color: var(--vermilion);
  font-size: 22px;
  line-height: 1;
}

.nav-links {
  display: flex;
  gap: 28px;
  margin-left: auto;
}

.nav-links a {
  color: rgba(245,240,232,0.8);
  font-size: 14px;
  letter-spacing: 1px;
  transition: color 0.2s;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transition: transform 0.2s;
}

.nav-links a:hover { color: var(--paper); }
.nav-links a:hover::after { transform: scaleX(1); }

.nav-cta {
  flex-shrink: 0;
  background: var(--vermilion);
  color: var(--white);
  padding: 8px 20px;
  border-radius: 3px;
  font-size: 13px;
  letter-spacing: 1px;
  transition: background 0.2s, transform 0.2s;
}

.nav-cta:hover { background: #a82e2e; transform: translateY(-1px); }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--paper);
  transition: transform 0.3s, opacity 0.3s;
}

/* 移动端侧边菜单 */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -280px;
  width: 260px;
  height: 100vh;
  background: var(--black);
  z-index: 1001;
  padding: 80px 32px 32px;
  transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
}

.mobile-menu.open { right: 0; }

.mobile-menu ul { display: flex; flex-direction: column; gap: 4px; }

.mobile-menu li a {
  display: block;
  color: rgba(245,240,232,0.85);
  padding: 12px 0;
  font-size: 16px;
  border-bottom: 1px solid rgba(200,195,180,0.1);
  transition: color 0.2s;
}

.mobile-menu li a:hover { color: var(--gold); }

.mobile-cta {
  display: inline-block;
  margin-top: 20px;
  background: var(--vermilion);
  color: var(--white);
  padding: 10px 24px;
  border-radius: 3px;
  text-align: center;
  font-size: 14px;
}

/* ══════════════════════════════════════════════════════
   Hero 首屏
   ══════════════════════════════════════════════════════ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding: 0;
  background: #0d0d0d;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: transparent;
  z-index: 1;
}

/* 真实图片背景：放在最底层，被渐变 / 蒙版覆盖后仍能透出氛围 */
.hero-image {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: url('images/banner-1.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  transform: scale(1.05);
  animation: heroZoom 18s ease-in-out infinite alternate;
}

@keyframes heroZoom {
  from { transform: scale(1.05); }
  to   { transform: scale(1.12); }
}

/* 暗色渐变蒙版：上下衰减 + 左右暗化，保证文字对比度 */
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(13,13,13,0.55) 0%, rgba(13,13,13,0.20) 38%, rgba(13,13,13,0.45) 68%, rgba(13,13,13,0.85) 100%),
    linear-gradient(90deg, rgba(13,13,13,0.55) 0%, rgba(13,13,13,0.10) 35%, rgba(13,13,13,0.10) 65%, rgba(13,13,13,0.55) 100%);
  z-index: 2;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  padding: 120px 24px 80px;
}

.hero-eyebrow {
  font-size: 14px;
  letter-spacing: 8px;
  color: rgba(184,146,42,0.9);
  margin-bottom: 24px;
  animation: fadeUp 0.8s ease-out both;
}

.hero-rule {
  width: 40px;
  height: 1px;
  background: rgba(184,146,42,0.4);
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(52px, 8vw, 96px);
  font-weight: 700;
  color: var(--paper);
  letter-spacing: 20px;
  line-height: 1.2;
  margin: 20px 0;
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
  animation: fadeUp 0.8s 0.15s ease-out both;
}

.hero-sub {
  font-size: clamp(20px, 3vw, 28px);
  color: var(--paper);
  letter-spacing: 4px;
  line-height: 1.8;
  margin: 24px 0;
  animation: fadeUp 0.8s 0.3s ease-out both;
}

.hero-desc {
  font-size: 15px;
  color: rgba(245,240,232,0.6);
  letter-spacing: 2px;
  line-height: 2;
  margin: 16px 0 40px;
  animation: fadeUp 0.8s 0.4s ease-out both;
}

.hero-btns {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeUp 0.8s 0.5s ease-out both;
}

.btn-primary {
  display: inline-block;
  background: var(--vermilion);
  color: var(--white);
  padding: 14px 40px;
  border-radius: 3px;
  font-size: 15px;
  letter-spacing: 2px;
  transition: background 0.25s, transform 0.25s, box-shadow 0.25s;
  box-shadow: 0 4px 20px rgba(194,58,58,0.3);
}

.btn-primary:hover {
  background: #a82e2e;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(194,58,58,0.4);
}

.btn-secondary {
  display: inline-block;
  background: transparent;
  color: var(--paper);
  padding: 14px 40px;
  border-radius: 3px;
  font-size: 15px;
  letter-spacing: 2px;
  border: 1px solid rgba(245,240,232,0.3);
  transition: border-color 0.25s, background 0.25s, transform 0.25s;
}

.btn-secondary:hover {
  border-color: var(--gold);
  background: rgba(184,146,42,0.1);
  transform: translateY(-2px);
}

.scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  animation: bounce 2s 1.5s infinite;
}

.scroll-arrow {
  display: block;
  font-size: 24px;
  color: rgba(184,146,42,0.6);
}

/* 浮动毛笔 */
.brush-deco {
  position: absolute;
  right: 8%;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  width: 40px;
  opacity: 0.15;
  animation: floatBrush 6s ease-in-out infinite;
}

/* ══════════════════════════════════════════════════════
   关于我们
   ══════════════════════════════════════════════════════ */
.about {
  background: var(--paper);
}

.about-desc {
  max-width: 760px;
  margin: 0 auto 64px;
  font-size: 16px;
  line-height: 2;
  color: var(--gray);
  text-align: center;
  letter-spacing: 1px;
}

/* 数据统计 */
.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 72px;
}

.stat-item {
  text-align: center;
  padding: 32px 16px;
  background: var(--white);
  border-radius: 4px;
  border: 1px solid var(--line);
  box-shadow: 0 2px 12px rgba(26,26,26,0.04);
  transition: transform 0.25s, box-shadow 0.25s;
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(26,26,26,0.08);
}

.stat-num {
  font-size: 42px;
  font-weight: 700;
  color: var(--vermilion);
  line-height: 1;
  margin-bottom: 8px;
  font-feature-settings: "tnum";
}

.stat-label {
  font-size: 13px;
  color: var(--gray);
  letter-spacing: 2px;
}

/* 时间轴 */
.timeline {
  margin-top: 20px;
}

.timeline-header {
  text-align: center;
  font-size: 16px;
  color: var(--teal);
  letter-spacing: 4px;
  margin-bottom: 40px;
  font-weight: 600;
}

.timeline-track {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 0 40px;
}

.timeline-line {
  position: absolute;
  top: 10px;
  left: 40px;
  right: 40px;
  height: 1px;
  background: linear-gradient(90deg, var(--line) 0%, var(--gold) 50%, var(--line) 100%);
}

.timeline-item {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  text-align: center;
}

.tl-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gold);
  border: 2px solid var(--paper);
  box-shadow: 0 0 0 3px var(--gold);
  margin-bottom: 12px;
  margin-top: 4px;
}

.tl-year {
  font-size: 13px;
  font-weight: 700;
  color: var(--vermilion);
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.tl-event {
  font-size: 13px;
  color: var(--gray);
  max-width: 100px;
  line-height: 1.5;
}

/* ══════════════════════════════════════════════════════
   核心功能
   ══════════════════════════════════════════════════════ */
.features {
  background: linear-gradient(180deg, var(--moon) 0%, var(--paper) 100%);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 80px;
}

.feature-card {
  background: var(--white);
  border-radius: 4px;
  padding: 40px 32px;
  border: 1px solid var(--line);
  box-shadow: 0 2px 12px rgba(26,26,26,0.04);
  text-align: center;
  transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(26,26,26,0.1);
}

.fc-icon {
  font-size: 40px;
  margin-bottom: 16px;
  line-height: 1;
}

.feature-card h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--black);
  margin-bottom: 12px;
}

.fc-divider {
  width: 40px;
  height: 2px;
  background: var(--gold);
  margin: 0 auto 20px;
}

.fc-list {
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.fc-list li {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.7;
  padding-left: 16px;
  position: relative;
}

.fc-list li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--vermilion);
  font-weight: 700;
}

/* 功能详情区 */
.feature-detail {
  background: var(--white);
  border-radius: 4px;
  padding: 56px 48px;
  border: 1px solid var(--line);
}

.fd-header {
  text-align: center;
  font-size: 20px;
  font-weight: 700;
  color: var(--teal);
  letter-spacing: 3px;
  margin-bottom: 40px;
}

.fd-flow {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 24px;
  margin-bottom: 56px;
  flex-wrap: wrap;
}

.fd-step {
  flex: 1;
  min-width: 180px;
  max-width: 240px;
  text-align: center;
  padding: 24px 16px;
}

.fd-step-icon {
  font-size: 36px;
  margin-bottom: 10px;
  line-height: 1;
}

.fd-step-num {
  font-size: 12px;
  color: var(--vermilion);
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.fd-step-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--black);
  margin-bottom: 8px;
}

.fd-step-desc {
  font-size: 13px;
  color: var(--gray);
  line-height: 1.7;
}

.fd-arrow {
  font-size: 28px;
  color: var(--gold);
  align-self: center;
  flex-shrink: 0;
}

/* 批改结果示意 */
.fd-result {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
  padding: 32px;
  background: linear-gradient(135deg, #faf8f3, #f0ece0);
  border-radius: 4px;
  border: 1px solid var(--line);
}

.fr-left { text-align: center; }

.fr-label {
  font-size: 13px;
  color: var(--gray);
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.fr-box {
  width: 100px;
  height: 100px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 56px;
  font-weight: 700;
}

.fr-box-handwriting {
  background: var(--paper);
  border: 1px solid var(--line);
  color: var(--black);
  font-family: "KaiTi", "楷体", serif;
  box-shadow: 0 2px 8px rgba(26,26,26,0.06);
}

.fr-arrow {
  font-size: 32px;
  color: var(--gold);
  flex-shrink: 0;
}

.fr-right { min-width: 260px; }

.fr-label { text-align: left; }

.fr-score {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 16px;
}

.fr-score-num {
  font-size: 56px;
  font-weight: 700;
  color: var(--vermilion);
  line-height: 1;
}

.fr-score-unit {
  font-size: 18px;
  color: var(--gray);
}

.fr-score-tag {
  background: var(--vermilion);
  color: var(--white);
  padding: 2px 10px;
  border-radius: 3px;
  font-size: 12px;
}

.fr-strokes {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.fr-stroke-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--gray);
}

.fr-stroke-item span:first-child {
  width: 16px;
  font-weight: 600;
  color: var(--black);
}

.fr-bar {
  flex: 1;
  height: 6px;
  background: rgba(26,26,26,0.08);
  border-radius: 3px;
  overflow: hidden;
}

.fr-bar-fill {
  height: 100%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--vermilion), var(--gold));
  transition: width 1s ease-out;
}

/* ══════════════════════════════════════════════════════
   产品视频
   ══════════════════════════════════════════════════════ */
.video {
  background: var(--black);
  color: var(--paper);
}

.video .section-title { color: var(--paper); }

.video-wrapper {
  max-width: 800px;
  margin: 0 auto 48px;
}

.video-placeholder {
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, #1e1a15, #2a2318);
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  cursor: pointer;
  border: 1px solid rgba(184,146,42,0.2);
  transition: border-color 0.3s;
  position: relative;
  overflow: hidden;
}

.video-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 40% at 50% 50%, rgba(194,58,58,0.08) 0%, transparent 70%);
}

.video-placeholder:hover { border-color: rgba(184,146,42,0.5); }

.vp-play {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: rgba(194,58,58,0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: var(--white);
  transition: transform 0.3s, background 0.3s;
  padding-left: 4px;
}

.video-placeholder:hover .vp-play {
  transform: scale(1.08);
  background: var(--vermilion);
}

.vp-label {
  font-size: 18px;
  color: rgba(245,240,232,0.8);
  letter-spacing: 3px;
}

.vp-sub {
  font-size: 13px;
  color: rgba(245,240,232,0.4);
  letter-spacing: 1px;
}

.video-versions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}

.vv-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(200,195,180,0.12);
  border-radius: 4px;
  padding: 28px 20px;
  text-align: center;
  transition: background 0.25s, border-color 0.25s;
}

.vv-card:hover {
  background: rgba(255,255,255,0.07);
  border-color: rgba(184,146,42,0.3);
}

/* 视频播放器 */
.video-wrapper {
  max-width: 800px;
  margin: 0 auto 48px;
  display: flex;
  justify-content: center;
}

.video-main {
  width: 100%;
  max-width: 800px;
  border-radius: 4px;
  background: #000;
  display: block;
  aspect-ratio: 16 / 9;
}

.vv-video {
  width: 100%;
  margin-top: 16px;
  border-radius: 4px;
  background: #000;
  aspect-ratio: 16 / 9;
}

/* 视频控件默认隐藏，hover时显示 */
video::-webkit-media-controls {
  opacity: 0;
  transition: opacity 0.3s ease;
}

video:hover::-webkit-media-controls {
  opacity: 1;
}

video::-webkit-media-controls-enclosure {
  opacity: 0;
  transition: opacity 0.3s ease;
  background: linear-gradient(transparent, rgba(0,0,0,0.5));
}

video:hover::-webkit-media-controls-enclosure {
  opacity: 1;
}

/* 隐藏画中画和翻译按钮 */
video::-webkit-media-controls-toggle-closed-captions-button,
video::-webkit-media-controls-picture-in-picture-button {
  display: none !important;
}

.vv-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
  margin-bottom: 8px;
}

.vv-desc {
  font-size: 13px;
  color: rgba(245,240,232,0.5);
  margin-bottom: 20px;
  line-height: 1.6;
}

.vv-btn {
  display: inline-block;
  border: 1px solid rgba(184,146,42,0.5);
  color: var(--gold);
  padding: 8px 20px;
  border-radius: 3px;
  font-size: 13px;
  letter-spacing: 1px;
  transition: background 0.2s, color 0.2s;
}

.vv-btn:hover {
  background: rgba(184,146,42,0.15);
}

/* ══════════════════════════════════════════════════════
   产品截图（手机模拟）
   ══════════════════════════════════════════════════════ */
.screenshots {
  background: var(--paper);
}

.screens-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.screen-card { display: flex; flex-direction: column; align-items: center; }

.sc-phone {
  width: 200px;
  height: 400px;
  background: var(--black);
  border-radius: 28px;
  padding: 12px;
  box-shadow: 0 20px 60px rgba(26,26,26,0.2), 0 0 0 1px rgba(26,26,26,0.1);
  position: relative;
  margin-bottom: 24px;
}

.sc-phone::before {
  content: '';
  position: absolute;
  top: 18px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 6px;
  background: rgba(26,26,26,0.5);
  border-radius: 3px;
  z-index: 1;
}

.sc-phone-screen {
  width: 100%;
  height: 100%;
  background: var(--paper);
  border-radius: 20px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.sc-label {
  background: var(--vermilion);
  color: var(--white);
  font-size: 10px;
  padding: 4px 8px;
  text-align: center;
  letter-spacing: 2px;
}

.sc-content {
  flex: 1;
  padding: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.sc-title {
  font-size: 10px;
  font-weight: 600;
  color: var(--black);
  text-align: center;
  letter-spacing: 1px;
}

.sc-score-circle {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  border: 3px solid var(--vermilion);
  display: flex;
  align-items: center;
  justify-content: center;
}

.scc-inner { text-align: center; }
.scc-num { font-size: 22px; font-weight: 700; color: var(--vermilion); display: block; line-height: 1; }
.scc-label { font-size: 9px; color: var(--gray); }

.sc-badges {
  font-size: 9px;
  color: var(--gray);
  background: rgba(26,26,26,0.05);
  padding: 2px 8px;
  border-radius: 10px;
}

.sc-history {
  font-size: 9px;
  color: var(--vermilion);
  margin-top: auto;
}

.sc-teacher-stats {
  display: flex;
  gap: 8px;
  width: 100%;
  justify-content: center;
}

.sts-item {
  text-align: center;
  background: rgba(26,26,26,0.05);
  padding: 4px 6px;
  border-radius: 4px;
  flex: 1;
}
.sts-item span { display: block; font-size: 14px; font-weight: 700; color: var(--black); }
.sts-item small { font-size: 8px; color: var(--gray); }

.sc-radar {
  width: 80px;
  height: 80px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sr-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(184,146,42,0.3);
}
.sr-ring-1 { width: 80px; height: 80px; }
.sr-ring-2 { width: 52px; height: 52px; }
.sr-ring-3 { width: 26px; height: 26px; }

.sr-label {
  position: absolute;
  font-size: 9px;
  color: var(--gray);
  font-weight: 600;
}
.sr-l1 { right: -2px; top: 50%; transform: translateY(-50%); }
.sr-l2 { left: -2px; top: 50%; transform: translateY(-50%); }
.sr-l3 { top: -2px; left: 50%; transform: translateX(-50%); }
.sr-l4 { bottom: -2px; left: 50%; transform: translateX(-50%); }

.sc-trend { width: 100%; }
.st-line svg { width: 100%; height: 50px; }
.st-labels { font-size: 8px; color: var(--gray); text-align: center; margin-top: 2px; }

.sc-push {
  background: rgba(26,26,26,0.06);
  border-radius: 4px;
  padding: 6px 8px;
  width: 100%;
}

.sp-badge {
  font-size: 8px;
  color: var(--vermilion);
  margin-bottom: 3px;
}
.sp-text { font-size: 8px; color: var(--gray); line-height: 1.5; }

.sc-desc { text-align: center; max-width: 220px; }

.sc-role {
  font-size: 13px;
  color: var(--vermilion);
  margin-bottom: 4px;
  letter-spacing: 2px;
}

.sc-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--black);
  margin-bottom: 8px;
}

.sc-desc p {
  font-size: 13px;
  color: var(--gray);
  line-height: 1.7;
}

/* ══════════════════════════════════════════════════════
   适用场景
   ══════════════════════════════════════════════════════ */
.scenarios {
  background: linear-gradient(180deg, var(--moon) 0%, var(--paper) 100%);
}

.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.scenario-card {
  background: var(--white);
  border-radius: 4px;
  padding: 32px 24px;
  text-align: center;
  border: 1px solid var(--line);
  box-shadow: 0 2px 12px rgba(26,26,26,0.04);
  transition: transform 0.25s, box-shadow 0.25s;
}

.scenario-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(26,26,26,0.08);
}

.sc-icon {
  font-size: 36px;
  margin-bottom: 14px;
  line-height: 1;
}

.sc-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--black);
  margin-bottom: 10px;
}

.sc-title + p {
  font-size: 13px;
  color: var(--gray);
  line-height: 1.7;
}

.scenarios-tags {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.scenarios-tags span {
  font-size: 13px;
  color: var(--teal);
  letter-spacing: 1px;
  padding: 6px 16px;
  border: 1px solid rgba(45,90,90,0.2);
  border-radius: 20px;
}

/* ══════════════════════════════════════════════════════
   合作案例
   ══════════════════════════════════════════════════════ */
.cases {
  background: var(--paper);
}

.cases-intro {
  text-align: center;
  font-size: 16px;
  color: var(--gray);
  margin-bottom: 48px;
  line-height: 1.8;
}

.cases-intro strong { color: var(--vermilion); }

/* 校园风光图片廊 */
.cases-gallery {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  grid-template-rows: 220px 220px;
  gap: 14px;
  margin-bottom: 56px;
}

.cg-item {
  position: relative;
  overflow: hidden;
  margin: 0;
  border-radius: 2px;
  background: var(--black);
}

.cg-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s ease, filter 0.4s ease;
  filter: saturate(0.9);
}

.cg-item:hover img {
  transform: scale(1.06);
  filter: saturate(1.05);
}

.cg-item figcaption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 16px 18px;
  font-size: 13px;
  color: var(--paper);
  background: linear-gradient(to top, rgba(26,26,26,0.78), rgba(26,26,26,0));
  letter-spacing: 1px;
  line-height: 1.6;
}

.cg-item figcaption span {
  display: inline-block;
  font-size: 12px;
  color: var(--gold);
  letter-spacing: 2px;
  margin-right: 6px;
}

.cg-item-wide { grid-column: span 4; grid-row: span 2; }
.cg-item:not(.cg-item-wide) { grid-column: span 2; }

.cases-logos {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

.cl-item {
  width: 120px;
  height: 56px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: var(--gray);
  letter-spacing: 1px;
  transition: border-color 0.2s, color 0.2s;
}

.cl-item:last-child { color: var(--gold); cursor: pointer; }
.cl-item:hover { border-color: var(--gold); color: var(--black); }

.case-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.case-card {
  background: var(--white);
  border-radius: 4px;
  padding: 32px;
  border: 1px solid var(--line);
  box-shadow: 0 2px 12px rgba(26,26,26,0.04);
  border-left: 3px solid var(--vermilion);
}

/* 图文案例卡片 */
.case-card-media {
  padding: 0;
  overflow: hidden;
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 0;
}

.cc-media {
  position: relative;
  min-height: 240px;
  background: var(--black);
  overflow: hidden;
}

.cc-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s ease;
}

.case-card-media:hover .cc-media img { transform: scale(1.05); }

.cc-media-tag {
  position: absolute;
  top: 14px;
  left: 14px;
  background: rgba(26,26,26,0.75);
  color: var(--paper);
  font-size: 11px;
  letter-spacing: 2px;
  padding: 4px 10px;
  border-radius: 2px;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.cc-body { padding: 28px 32px; }
.case-card-media .cc-title { margin-bottom: 18px; }

.cc-tag {
  font-size: 12px;
  color: var(--vermilion);
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.cc-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--black);
  margin-bottom: 16px;
}

.cc-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cc-list li {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.7;
  padding-left: 16px;
  position: relative;
}

.cc-list li::before { content: '·'; position: absolute; left: 0; color: var(--vermilion); font-weight: 700; }
.cc-list li strong { color: var(--black); }

/* ══════════════════════════════════════════════════════
   联系我们
   ══════════════════════════════════════════════════════ */
.contact {
  background: var(--black);
  color: var(--paper);
}

.contact .section-title { color: var(--paper); }

.contact-intro {
  text-align: center;
  font-size: 15px;
  color: rgba(245,240,232,0.6);
  max-width: 640px;
  margin: 0 auto 56px;
  line-height: 1.9;
  letter-spacing: 1px;
}

.contact-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 56px;
  align-items: start;
}

.contact-info { display: flex; flex-direction: column; gap: 28px; }

.ci-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(200,195,180,0.1);
}

.ci-item:last-child { border-bottom: none; }

.ci-icon { font-size: 22px; }

.ci-label {
  font-size: 12px;
  color: rgba(184,146,42,0.8);
  letter-spacing: 3px;
}

.ci-value {
  font-size: 15px;
  color: var(--paper);
  letter-spacing: 1px;
}

.ci-qr {
  width: 80px;
  height: 80px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(200,195,180,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(245,240,232,0.3);
  font-size: 32px;
  margin-top: 8px;
}

/* 表单 */
.contact-form { display: flex; flex-direction: column; gap: 20px; }

.cf-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.cf-field { display: flex; flex-direction: column; gap: 8px; }

.cf-field label {
  font-size: 12px;
  color: rgba(184,146,42,0.8);
  letter-spacing: 2px;
}

.cf-field input {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(200,195,180,0.2);
  border-radius: 3px;
  padding: 12px 14px;
  color: var(--paper);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}

.cf-field input::placeholder { color: rgba(245,240,232,0.3); }
.cf-field input:focus { border-color: var(--gold); }

.cf-radios {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.cf-radio {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: rgba(245,240,232,0.7);
  cursor: pointer;
}

.cf-radio input[type="radio"] { accent-color: var(--vermilion); }

.cf-submit {
  background: var(--vermilion);
  color: var(--white);
  border: none;
  padding: 14px;
  border-radius: 3px;
  font-size: 15px;
  letter-spacing: 3px;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.2s, transform 0.2s;
}

.cf-submit:hover { background: #a82e2e; transform: translateY(-1px); }

.cf-msg {
  text-align: center;
  font-size: 14px;
  min-height: 20px;
  color: var(--gold);
}

/* ══════════════════════════════════════════════════════
   底部
   ══════════════════════════════════════════════════════ */
.footer {
  background: #111;
  color: var(--paper);
}

.footer-cta {
  text-align: center;
  padding: 64px 24px;
  border-bottom: 1px solid rgba(200,195,180,0.1);
}

.fc-tagline {
  font-size: 28px;
  margin-bottom: 24px;
  letter-spacing: 4px;
}

.fc-btns {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 12px;
  padding: 24px;
  flex-wrap: wrap;
  font-size: 13px;
  color: rgba(245,240,232,0.5);
}

.footer-links a { transition: color 0.2s; }
.footer-links a:hover { color: var(--gold); }
.fl-sep { opacity: 0.3; }

.footer-bottom {
  text-align: center;
  padding: 24px;
  border-top: 1px solid rgba(200,195,180,0.08);
  font-size: 12px;
  color: rgba(245,240,232,0.3);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.fb-seal {
  color: var(--vermilion);
  font-size: 32px;
  opacity: 0.6;
}

/* ══════════════════════════════════════════════════════
   动画
   ══════════════════════════════════════════════════════ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}

@keyframes floatBrush {
  0%, 100% { transform: translateY(-50%) rotate(-2deg); }
  50%       { transform: translateY(-54%) rotate(2deg); }
}

/* 入场动画（Intersection Observer 触发） */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ══════════════════════════════════════════════════════
   小程序二维码弹窗
   ══════════════════════════════════════════════════════ */
.mini-program-modal {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.mini-program-modal.open {
  visibility: visible;
  opacity: 1;
}

.mini-program-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(26, 26, 26, 0.72);
}

.mini-program-dialog {
  position: relative;
  width: min(100%, 390px);
  padding: 42px 32px 32px;
  text-align: center;
  background: var(--paper);
  border: 1px solid rgba(184, 146, 42, 0.55);
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.28);
  transform: translateY(12px) scale(0.98);
  transition: transform 0.25s ease;
}

.mini-program-modal.open .mini-program-dialog {
  transform: translateY(0) scale(1);
}

.mini-program-close {
  position: absolute;
  top: 10px;
  right: 14px;
  width: 36px;
  height: 36px;
  border: 0;
  background: transparent;
  color: var(--gray);
  font: 32px/1 Arial, sans-serif;
  cursor: pointer;
}

.mini-program-close:hover { color: var(--vermilion); }

.mini-program-kicker {
  margin-bottom: 8px;
  color: var(--vermilion);
  font-size: 13px;
  letter-spacing: 3px;
}

.mini-program-dialog h2 {
  margin-bottom: 22px;
  color: var(--black);
  font-size: 26px;
}

.mini-program-qr {
  width: min(100%, 280px);
  aspect-ratio: 1;
  margin: 0 auto 20px;
  object-fit: contain;
  background: var(--white);
  border: 8px solid var(--white);
}

.mini-program-dialog p {
  color: var(--gray);
  font-size: 15px;
  line-height: 1.8;
}

body.modal-open { overflow: hidden; }

/* ══════════════════════════════════════════════════════
   响应式
   ══════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  .about-stats { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: 1fr; max-width: 480px; margin-left: auto; margin-right: auto; }
  .screens-grid { grid-template-columns: repeat(3, 1fr); gap: 20px; }
  .sc-phone { width: 160px; height: 320px; }
  .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
  .case-list { grid-template-columns: 1fr; }
  .case-card-media { grid-template-columns: 240px 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-info { flex-direction: row; flex-wrap: wrap; gap: 20px; }
  .ci-item { flex: 1; min-width: 200px; }
}

@media (max-width: 768px) {
  .nav-links, .nav-cta { display: none; }
  .nav-hamburger { display: flex; }

  .hero-title { letter-spacing: 10px; }
  .hero-sub { letter-spacing: 2px; }

  .about-stats { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .stat-num { font-size: 32px; }

  .timeline-track { flex-direction: column; gap: 24px; padding: 0; }
  .timeline-line { display: none; }
  .timeline-item { flex-direction: row; text-align: left; gap: 16px; align-items: center; }
  .tl-dot { margin-bottom: 0; flex-shrink: 0; }
  .tl-year { margin-bottom: 0; }

  .screens-grid { grid-template-columns: 1fr; gap: 48px; }
  .sc-phone { width: 180px; height: 360px; }
  .scenarios-grid { grid-template-columns: 1fr; }

  .cf-row { grid-template-columns: 1fr; }
  .cf-radios { grid-template-columns: 1fr; }

  .video-versions { grid-template-columns: 1fr; }

  .cases-gallery {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(4, 180px);
    gap: 10px;
  }
  .cg-item-wide { grid-column: span 2; grid-row: span 1; }
  .cg-item:not(.cg-item-wide) { grid-column: span 1; }
  .case-card-media { grid-template-columns: 1fr; }
  .cc-media { min-height: 200px; }
  .cc-body { padding: 24px 24px; }

  .footer-cta { padding: 48px 24px; }
  .fc-tagline { font-size: 22px; }
}