/* ========================================
   lfloorball-goalkeeper — 软曲守门技术
   低饱和度优雅风格
   ======================================== */

/* --- 变量 --- */
:root {
  --sage: #8BA888;
  --sage-dark: #6B8568;
  --sage-light: #C5D5C2;
  --cream: #F5F1EB;
  --cream-dark: #E8E2D9;
  --terracotta: #C4956A;
  --terracotta-dark: #A67850;
  --text: #3D3929;
  --text-light: #6B6655;
  --text-muted: #999588;
  --white: #FFFFFF;
  --shadow-sm: 0 1px 4px rgba(61, 57, 41, 0.08);
  --shadow-md: 0 4px 20px rgba(61, 57, 41, 0.12);
  --shadow-lg: 0 8px 40px rgba(61, 57, 41, 0.16);
  --radius: 12px;
  --radius-lg: 20px;
  --max-width: 1100px;
  --font-cn: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-en-heading: Georgia, "Times New Roman", serif;
  --font-en-body: "Segoe UI", system-ui, -apple-system, sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-cn);
  color: var(--text);
  background-color: var(--cream);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

/* --- 排版 --- */
h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0.02em;
}

h1 { font-size: 3.2rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.4rem; }
h4 { font-size: 1.1rem; }

p { margin-bottom: 1rem; }

a {
  color: var(--sage-dark);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--terracotta); }

.en {
  font-family: var(--font-en-body);
  letter-spacing: 0.01em;
}

.en-serif {
  font-family: var(--font-en-heading);
  font-style: italic;
}

/* --- 容器 --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* --- 导航栏 --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(245, 241, 235, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--cream-dark);
  transition: all var(--transition);
}

.nav.scrolled {
  background: rgba(245, 241, 235, 0.95);
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 60px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.nav-brand {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--sage-dark);
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-light);
  font-size: 0.95rem;
  position: relative;
  padding-bottom: 4px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--sage);
  transition: width var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-links a.active {
  color: var(--sage-dark);
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 8rem 2rem 5rem;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  opacity: 0.06;
  pointer-events: none;
}

.hero-bg .circle {
  position: absolute;
  border-radius: 50%;
  border: 2px solid var(--sage);
}

.hero-bg .circle-1 {
  width: 400px; height: 400px;
  top: -100px; right: -100px;
}

.hero-bg .circle-2 {
  width: 200px; height: 200px;
  bottom: 10%; left: 5%;
  border-color: var(--terracotta);
}

.hero-bg .circle-3 {
  width: 150px; height: 150px;
  top: 30%; left: 15%;
  border-color: var(--sage-light);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 680px;
}

.hero-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 2rem;
  display: block;
  opacity: 0.85;
}

.hero h1 {
  color: var(--text);
  margin-bottom: 0.5rem;
}

.hero .subtitle {
  font-family: var(--font-en-heading);
  font-style: italic;
  font-size: 1.3rem;
  color: var(--sage-dark);
  margin-bottom: 1.5rem;
  letter-spacing: 0.04em;
}

.hero .desc {
  color: var(--text-light);
  font-size: 1.05rem;
  line-height: 1.9;
  max-width: 540px;
  margin: 0 auto;
}

.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  animation: bounce 2s infinite;
}

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

.hero-scroll svg {
  width: 20px;
  height: 20px;
}

/* --- 板块通用 --- */
.section {
  padding: 6rem 2rem;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header .tag {
  display: inline-block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--terracotta);
  background: rgba(196, 149, 106, 0.1);
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 1rem;
}

.section-header h2 {
  margin-bottom: 0.5rem;
}

.section-header .en-subtitle {
  font-family: var(--font-en-heading);
  font-style: italic;
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* --- 卡片 --- */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  overflow: hidden;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2.5rem;
}

.card-media {
  height: 200px;
  background: linear-gradient(135deg, var(--sage-light) 0%, var(--cream) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.card-media svg {
  width: 80px;
  height: 80px;
  opacity: 0.6;
  transition: transform var(--transition);
}

.card:hover .card-media svg {
  transform: scale(1.08);
}

.card-media.theory {
  background: linear-gradient(135deg, #d5cfc8 0%, #f0ebe0 100%);
}

.card-media.video {
  background: linear-gradient(135deg, #c5d5c2 0%, #e5efe2 100%);
}

.card-body {
  padding: 2rem;
}

.card-body h3 {
  margin-bottom: 0.6rem;
}

.card-body p {
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.7;
}

.card-action {
  display: inline-block;
  margin-top: 1.2rem;
  padding: 9px 24px;
  border: 1.5px solid var(--sage-dark);
  border-radius: 24px;
  color: var(--sage-dark);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
}

.card-action:hover {
  background: var(--sage-dark);
  color: var(--white);
  transform: none;
}

/* --- 底部 --- */
.footer {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--cream-dark);
}

.footer a {
  color: var(--text-light);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

/* --- 子页面 --- */
.page-hero {
  padding: 8rem 2rem 4rem;
  text-align: center;
  background: linear-gradient(180deg, var(--sage-light) 0%, transparent 100%);
}

.page-hero h1 {
  color: var(--text);
  margin-bottom: 0.5rem;
}

.page-hero .en-subtitle {
  font-family: var(--font-en-heading);
  font-style: italic;
  color: var(--sage-dark);
  font-size: 1.2rem;
  margin-bottom: 1rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 2rem;
  transition: color var(--transition);
}

.back-link:hover { color: var(--terracotta); }

/* --- 教材列表 --- */
.content-list {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 2rem 5rem;
}

.content-item {
  display: flex;
  gap: 1.5rem;
  padding: 2rem;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
  transition: all var(--transition);
  border-left: 3px solid transparent;
}

.content-item:hover {
  box-shadow: var(--shadow-md);
  border-left-color: var(--sage);
}

.content-item-num {
  font-family: var(--font-en-heading);
  font-size: 2.5rem;
  color: var(--sage-light);
  line-height: 1;
  min-width: 50px;
  text-align: center;
}

.content-item-info h3 {
  margin-bottom: 0.3rem;
}

.content-item-info .meta {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.content-item-info .desc {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

/* --- 视频卡片 --- */
.video-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all var(--transition);
}

.video-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.video-thumb {
  width: 100%;
  height: 220px;
  background: linear-gradient(135deg, #d5cfc8 0%, #e8e2d9 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-thumb svg {
  width: 50px;
  height: 50px;
  opacity: 0.4;
}

.video-info {
  padding: 1.5rem;
}

.video-info h3 {
  font-size: 1.1rem;
  margin-bottom: 0.3rem;
}

.video-info .platform {
  color: #FB7299;
  font-size: 0.8rem;
  font-weight: 500;
}

.video-placeholder {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

/* --- 响应式 --- */
@media (max-width: 768px) {
  h1 { font-size: 2.2rem; }
  h2 { font-size: 1.6rem; }

  .hero { min-height: auto; padding: 7rem 1.5rem 4rem; }
  .hero .subtitle { font-size: 1.1rem; }
  .hero .desc { font-size: 0.95rem; }

  .section { padding: 4rem 1.5rem; }
  .cards-grid { grid-template-columns: 1fr; gap: 1.5rem; }

  .nav-links { gap: 1rem; }
  .nav-links a { font-size: 0.85rem; }

  .content-item { flex-direction: column; gap: 0.8rem; }
  .content-item-num { text-align: left; }

  .page-hero { padding: 6rem 1.5rem 3rem; }
}

@media (max-width: 480px) {
  .container { padding: 0 1rem; }
  .nav-inner { padding: 0 1rem; }
  .hero-icon { width: 60px; height: 60px; }
}