/* ============================================
   Young Seek - 品牌视觉系统 & 全局样式
   ============================================ */

/* ---------- CSS Variables 品牌色彩系统 ---------- */
:root {
  /* 主色系 - 五色品牌体系 */
  --color-red: #F54336;
  --color-red-light: #FF6B5E;
  --color-red-dark: #D63025;
  --color-red-bg: #FFF0EE;

  --color-blue: #21A7F2;
  --color-blue-light: #4DBFF7;
  --color-blue-dark: #0E8BD1;
  --color-blue-bg: #E8F6FE;

  --color-yellow: #F5B82E;
  --color-yellow-light: #FFCC4D;
  --color-yellow-dark: #D99A15;
  --color-yellow-bg: #FFF8E8;

  --color-green: #58B249;
  --color-green-light: #7CC46F;
  --color-green-dark: #409233;
  --color-green-bg: #EDF7EB;

  --color-teal: #25D0B8;
  --color-teal-light: #4DDCC9;
  --color-teal-dark: #15B59F;
  --color-teal-bg: #E6FAF7;

  /* 中性色 */
  --color-gray-900: #1A1A2E;
  --color-gray-800: #2D3748;
  --color-gray-700: #4A5568;
  --color-gray-600: #718096;
  --color-gray-500: #A0AEC0;
  --color-gray-400: #CBD5E0;
  --color-gray-300: #E2E8F0;
  --color-gray-200: #EDF2F7;
  --color-gray-100: #F7FAFC;
  --color-white: #FFFFFF;

  /* 文字颜色 */
  --text-primary: #1A1A2E;
  --text-secondary: #4A5568;
  --text-tertiary: #718096;
  --text-light: #A0AEC0;

  /* 字体 */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-display: 'Poppins', -apple-system, BlinkMacSystemFont, 'PingFang SC', sans-serif;

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);
  --shadow-glow-red: 0 8px 24px rgba(245, 67, 54, 0.25);
  --shadow-glow-blue: 0 8px 24px rgba(33, 167, 242, 0.25);
  --shadow-glow-yellow: 0 8px 24px rgba(245, 184, 46, 0.25);
  --shadow-glow-green: 0 8px 24px rgba(88, 178, 73, 0.25);
  --shadow-glow-teal: 0 8px 24px rgba(37, 208, 184, 0.25);

  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* 容器 */
  --container-max: 1200px;
  --container-padding: 24px;
}

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

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

body {
  font-family: var(--font-primary);
  color: var(--text-primary);
  line-height: 1.6;
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

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

.container-wide {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* ---------- 按钮系统 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-red), var(--color-red-light));
  color: var(--color-white);
  box-shadow: var(--shadow-glow-red);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(245, 67, 54, 0.35);
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-red);
  border: 2px solid var(--color-red);
}

.btn-secondary:hover {
  background: var(--color-red);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-blue {
  background: linear-gradient(135deg, var(--color-blue), var(--color-blue-light));
  color: var(--color-white);
  box-shadow: var(--shadow-glow-blue);
}

.btn-blue:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(33, 167, 242, 0.35);
}

.btn-green {
  background: linear-gradient(135deg, var(--color-green), var(--color-green-light));
  color: var(--color-white);
  box-shadow: var(--shadow-glow-green);
}

.btn-green:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(88, 178, 73, 0.35);
}

.btn-outline-white {
  background: transparent;
  color: var(--color-white);
  border: 2px solid var(--color-white);
}

.btn-outline-white:hover {
  background: var(--color-white);
  color: var(--color-red);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 18px 40px;
  font-size: 18px;
}

.btn-sm {
  padding: 10px 24px;
  font-size: 14px;
}

/* ---------- 标题样式 ---------- */
.section-title {
  text-align: center;
  margin-bottom: 60px;
}

.section-title .subtitle {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-red);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
  padding: 6px 16px;
  background: var(--color-red-bg);
  border-radius: var(--radius-full);
}

.section-title h2 {
  font-size: 42px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-title p {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.section-title.blue .subtitle {
  color: var(--color-blue);
  background: var(--color-blue-bg);
}

.section-title.green .subtitle {
  color: var(--color-green);
  background: var(--color-green-bg);
}

.section-title.yellow .subtitle {
  color: var(--color-yellow-dark);
  background: var(--color-yellow-bg);
}

/* ---------- 卡片样式 ---------- */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.card-icon {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  margin-bottom: 24px;
}

.card-icon.red { background: var(--color-red-bg); color: var(--color-red); }
.card-icon.blue { background: var(--color-blue-bg); color: var(--color-blue); }
.card-icon.yellow { background: var(--color-yellow-bg); color: var(--color-yellow); }
.card-icon.green { background: var(--color-green-bg); color: var(--color-green); }
.card-icon.teal { background: var(--color-teal-bg); color: var(--color-teal); }

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

.card p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.7;
}

/* ---------- 标签/徽章 ---------- */
.badge {
  display: inline-block;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-full);
}

.badge-red { background: var(--color-red-bg); color: var(--color-red); }
.badge-blue { background: var(--color-blue-bg); color: var(--color-blue); }
.badge-yellow { background: var(--color-yellow-bg); color: var(--color-yellow-dark); }
.badge-green { background: var(--color-green-bg); color: var(--color-green); }
.badge-teal { background: var(--color-teal-bg); color: var(--color-teal-dark); }

/* ---------- 分隔线 ---------- */
.divider {
  width: 60px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--color-red), var(--color-yellow));
  margin: 0 auto;
}

/* ---------- 动画 ---------- */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-40px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(40px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.animate-float { animation: float 6s ease-in-out infinite; }
.animate-pulse { animation: pulse 2s ease-in-out infinite; }
.animate-bounce { animation: bounce 2s ease-in-out infinite; }

.animate-on-scroll {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .section-title h2 {
    font-size: 36px;
  }
}

@media (max-width: 768px) {
  :root {
    --container-padding: 20px;
  }

  .section-title {
    margin-bottom: 40px;
  }

  .section-title h2 {
    font-size: 28px;
  }

  .section-title p {
    font-size: 16px;
  }

  .btn {
    padding: 12px 24px;
    font-size: 14px;
  }

  .btn-lg {
    padding: 14px 28px;
    font-size: 16px;
  }

  .card {
    padding: 24px;
  }
}

@media (max-width: 480px) {
  .section-title h2 {
    font-size: 24px;
  }
}

/* ---------- 滚动条美化 ---------- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-gray-100);
}

::-webkit-scrollbar-thumb {
  background: var(--color-gray-400);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-500);
}

/* ---------- 选择文字颜色 ---------- */
::selection {
  background: var(--color-red-light);
  color: var(--color-white);
}