/* ============================================
   style.css - MK体育官网首页 完整样式表
   风格: 现代体育科技风 (渐变Banner, 圆角卡片, 毛玻璃效果)
   响应式: PC + 手机自适应
   暗色模式: 支持
   滚动动画: 基于Intersection Observer (通过CSS class触发)
   hover动画: 丰富交互
   ============================================ */

/* ---------- CSS变量 & 全局重置 ---------- */
:root {
  --color-bg: #f4f6fb;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-secondary: #4a4a6a;
  --color-primary: #1a1a2e;
  --color-accent: #f0c040;
  --color-accent-light: #fae28a;
  --color-border: rgba(0,0,0,0.08);
  --color-glass-bg: rgba(255,255,255,0.6);
  --color-glass-border: rgba(255,255,255,0.3);
  --color-hero-overlay: rgba(26,26,46,0.65);
  --color-hero-start: #0f0c29;
  --color-hero-mid: #302b63;
  --color-hero-end: #24243e;
  --color-card-shadow: rgba(0,0,0,0.06);
  --color-faq-bg: rgba(255,255,255,0.5);
  --color-footer-bg: #1a1a2e;
  --color-footer-text: #ccccdd;
  --radius-card: 20px;
  --radius-button: 40px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

/* 暗色模式 */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #12121a;
    --color-surface: #1e1e30;
    --color-text: #eaeaf0;
    --color-text-secondary: #a0a0c0;
    --color-border: rgba(255,255,255,0.1);
    --color-glass-bg: rgba(30,30,48,0.7);
    --color-glass-border: rgba(255,255,255,0.08);
    --color-hero-overlay: rgba(0,0,0,0.6);
    --color-hero-start: #0b0b14;
    --color-hero-mid: #1a1a2e;
    --color-hero-end: #12121a;
    --color-card-shadow: rgba(0,0,0,0.3);
    --color-faq-bg: rgba(30,30,48,0.5);
    --color-footer-bg: #0b0b14;
    --color-footer-text: #8888aa;
  }
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
  transition: background-color 0.4s, color 0.4s;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

ul, ol {
  list-style: none;
  padding-left: 0;
}

img, svg {
  display: block;
  max-width: 100%;
}

/* ---------- 滚动动画基类 (配合JS或纯CSS) ---------- */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 也可以直接用CSS animation + intersection observer (通过class) */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.7s ease forwards;
}

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

/* ---------- 头部导航 ---------- */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  background: var(--color-glass-bg);
  border-bottom: 1px solid var(--color-glass-border);
  transition: background 0.3s;
}

header nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

header nav > a[aria-label="MK体育首页"] {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--color-accent), #e6b800);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: transform 0.2s;
}

header nav > a[aria-label="MK体育首页"]:hover {
  transform: scale(1.03);
}

header nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  align-items: center;
}

header nav ul li a {
  font-size: 0.95rem;
  font-weight: 500;
  padding: 6px 10px;
  border-radius: 30px;
  color: var(--color-text-secondary);
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}

header nav ul li a:hover {
  background: var(--color-accent);
  color: var(--color-primary);
}

/* 手机导航 - 紧凑 */
@media (max-width: 768px) {
  header nav {
    padding: 10px 16px;
  }
  header nav ul {
    gap: 4px 10px;
  }
  header nav ul li a {
    font-size: 0.82rem;
    padding: 4px 8px;
  }
}

/* ---------- Hero Banner (渐变) ---------- */
#hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(135deg, var(--color-hero-start), var(--color-hero-mid), var(--color-hero-end));
  overflow: hidden;
  padding: 80px 24px 60px;
}

#hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 50%, rgba(240,192,64,0.15) 0%, transparent 50%),
              radial-gradient(circle at 80% 50%, rgba(100,100,255,0.1) 0%, transparent 50%);
  pointer-events: none;
}

#hero article {
  position: relative;
  z-index: 2;
  max-width: 800px;
  color: #ffffff;
  text-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

#hero h1 {
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 20px;
  background: linear-gradient(to right, #f0c040, #ffe680);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

#hero p {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  max-width: 650px;
  margin: 0 auto 36px;
  opacity: 0.92;
  line-height: 1.7;
}

#hero a {
  display: inline-block;
  margin: 8px 12px;
  padding: 14px 40px;
  border-radius: var(--radius-button);
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--transition);
  cursor: pointer;
  text-shadow: none;
}

#hero a:first-of-type {
  background: var(--color-accent);
  color: var(--color-primary);
  box-shadow: 0 8px 28px rgba(240,192,64,0.35);
}

#hero a:first-of-type:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 36px rgba(240,192,64,0.5);
}

#hero a:last-of-type {
  background: transparent;
  border: 2px solid rgba(255,255,255,0.6);
  color: #fff;
}

#hero a:last-of-type:hover {
  background: rgba(255,255,255,0.12);
  border-color: #fff;
  transform: translateY(-2px);
}

@media (max-width: 600px) {
  #hero {
    min-height: 70vh;
    padding: 60px 16px 40px;
  }
  #hero a {
    padding: 12px 28px;
    font-size: 0.95rem;
  }
}

/* ---------- 通用 Section ---------- */
section {
  padding: 80px 24px;
}

section > article {
  max-width: var(--max-width);
  margin: 0 auto;
}

section h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 32px;
  position: relative;
  display: inline-block;
}

section h2::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 60px;
  height: 4px;
  background: var(--color-accent);
  border-radius: 4px;
}

section p {
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  font-size: 1.05rem;
  line-height: 1.8;
}

/* ---------- 圆角卡片 (毛玻璃) ---------- */
.card, section ul, section ol, details, #knowledge article[id^="article"] {
  background: var(--color-glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-card);
  padding: 28px 32px;
  box-shadow: 0 8px 24px var(--color-card-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover, section ul:hover, details:hover, #knowledge article[id^="article"]:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px var(--color-card-shadow);
}

section ul, section ol {
  list-style: none;
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

section ul li, section ol li {
  padding-left: 28px;
  position: relative;
  line-height: 1.6;
}

section ul li::before {
  content: '✦';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-size: 1.1rem;
}

section ol li {
  counter-increment: item;
}

section ol li::before {
  content: counter(item) '.';
  position: absolute;
  left: 0;
  font-weight: 700;
  color: var(--color-accent);
}

/* ---------- 各section微调 ---------- */
#about, #products, #services, #solutions, #industries, #features, #benefits, #workflow, #knowledge, #faq, #howto, #contact {
  scroll-margin-top: 80px;
}

#about article, #products article, #services article, #solutions article, #industries article,
#features article, #benefits article, #workflow article, #knowledge article, #faq article, #howto article, #contact article {
  background: var(--color-surface);
  border-radius: var(--radius-card);
  padding: 40px 36px;
  box-shadow: 0 4px 20px var(--color-card-shadow);
  transition: background 0.3s;
}

@media (max-width: 600px) {
  section {
    padding: 48px 16px;
  }
  #about article, #products article, #services article, #solutions article, #industries article,
  #features article, #benefits article, #workflow article, #knowledge article, #faq article, #howto article, #contact article {
    padding: 24px 20px;
  }
}

/* ---------- 知识中心文章卡片 ---------- */
#knowledge ul {
  margin-bottom: 32px;
}

#knowledge ul li a {
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}

#knowledge ul li a:hover {
  border-bottom-color: var(--color-accent);
  color: var(--color-accent);
}

#knowledge article[id^="article"] {
  margin-top: 20px;
  padding: 24px 28px;
}

#knowledge article[id^="article"] h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
  color: var(--color-text);
}

/* ---------- FAQ (details) ---------- */
#faq details {
  margin-bottom: 12px;
  padding: 16px 24px;
  cursor: pointer;
  border-radius: 16px;
  background: var(--color-faq-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: background 0.2s;
}

#faq details[open] {
  background: var(--color-glass-bg);
}

#faq summary {
  font-weight: 600;
  font-size: 1.05rem;
  padding: 4px 0;
  outline: none;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

#faq summary::-webkit-details-marker {
  display: none;
}

#faq summary::after {
  content: '+';
  font-size: 1.4rem;
  font-weight: 300;
  transition: transform 0.3s;
  color: var(--color-accent);
}

#faq details[open] summary::after {
  content: '−';
  transform: rotate(180deg);
}

#faq details p {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

/* ---------- 联系 & 底部 ---------- */
#contact ul li {
  padding: 8px 0;
  font-size: 1.05rem;
}

#contact ul li::before {
  content: '📞';
  margin-right: 10px;
  color: var(--color-accent);
}

#contact ul li:nth-child(2)::before {
  content: '✉️';
}

#contact ul li:nth-child(3)::before {
  content: '📍';
}

footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: 48px 24px 32px;
  text-align: center;
}

footer section {
  max-width: var(--max-width);
  margin: 0 auto;
}

footer h2 {
  font-size: 1.4rem;
  margin-bottom: 16px;
  color: #fff;
}

footer p {
  font-size: 0.95rem;
  opacity: 0.8;
  margin-bottom: 12px;
}

footer ul {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
  margin: 20px 0 16px;
}

footer ul li a {
  color: var(--color-accent-light);
  transition: color 0.2s;
}

footer ul li a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

/* ---------- 响应式细节 ---------- */
@media (max-width: 480px) {
  header nav ul {
    justify-content: center;
    gap: 4px 6px;
  }
  .card, section ul, section ol, details, #knowledge article[id^="article"] {
    padding: 18px 16px;
  }
  section h2 {
    font-size: 1.6rem;
  }
  footer ul {
    gap: 12px;
  }
}

/* ---------- 滚动动画默认隐藏 (配合JS) ---------- */
.section-hidden {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.section-visible {
  opacity: 1;
  transform: translateY(0);
}

/* 所有section默认应用滚动动画 (如果希望纯CSS自动触发, 可加animation, 但此处用class控制) */
section > article {
  will-change: transform, opacity;
}

/* 额外的hover效果: 按钮 & 链接 */
a[href]:not(nav a):hover {
  color: var(--color-accent);
}

/* 选中文本高亮 */
::selection {
  background: var(--color-accent);
  color: var(--color-primary);
}

/* 滚动条美化 */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg);
}
::-webkit-scrollbar-thumb {
  background: var(--color-accent);
  border-radius: 10px;
}

/* 打印样式 */
@media print {
  header, footer, #hero a {
    display: none;
  }
  body {
    background: #fff;
    color: #000;
  }
}