/* ============================================================
   设计系统 - Design System
   深蓝主色 (Deep Blue) + 橙色强调 (Orange Accent)
   ============================================================ */

:root {
  /* 主色 - 深蓝 */
  --color-primary: #0a2b5e;
  --color-primary-dark: #071c40;
  --color-primary-light: #1a4a8a;
  --color-primary-50: #eef3fa;

  /* 强调色 - 橙色 */
  --color-accent: #ff7a1a;
  --color-accent-dark: #e85d00;
  --color-accent-light: #ff9a4d;
  --color-accent-50: #fff2e8;

  /* 中性色 */
  --color-white: #ffffff;
  --color-black: #0a0f1a;
  --color-gray-50: #f6f8fb;
  --color-gray-100: #eef1f6;
  --color-gray-200: #dde3ec;
  --color-gray-300: #c2cce0;
  --color-gray-400: #8a97ad;
  --color-gray-500: #5b6678;
  --color-gray-600: #3a4354;
  --color-gray-700: #242c3a;
  --color-gray-900: #0f1622;

  /* 功能色 */
  --color-success: #16a34a;
  --color-warning: #d97706;
  --color-danger: #dc2626;
  --color-info: #2563eb;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(10, 43, 94, 0.06);
  --shadow-md: 0 4px 12px rgba(10, 43, 94, 0.08);
  --shadow-lg: 0 12px 32px rgba(10, 43, 94, 0.12);
  --shadow-xl: 0 24px 48px rgba(10, 43, 94, 0.16);

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* 字体 */
  --font-sans: 'Inter', 'Segoe UI', 'PingFang SC', sans-serif;
  --font-arabic: 'Cairo', 'Tajawal', 'Segoe UI', sans-serif;

  /* 布局 */
  --container: 1200px;
  --header-height: 76px;
  --transition: 0.25s ease;

  /* RTL 支持 */
  --start: left;
  --end: right;
}

/* 当语言为阿拉伯语时，启用 RTL */
html[dir='rtl'] {
  --start: right;
  --end: left;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-sans);
  color: var(--color-gray-700);
  background: var(--color-white);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* 阿拉伯语字体 */
html[lang='ar'] body {
  font-family: var(--font-arabic);
}

a {
  color: inherit;
  text-decoration: none;
}

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

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

input,
textarea,
select {
  font: inherit;
}

ul,
ol {
  list-style: none;
}

/* ============================================================
   排版 Typography
   ============================================================ */
h1,
h2,
h3,
h4,
h5 {
  color: var(--color-primary);
  font-weight: 700;
  line-height: 1.25;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  text-align: center;
  margin-bottom: 0.75rem;
}

.section-subtitle {
  text-align: center;
  color: var(--color-gray-400);
  font-size: 1.05rem;
  max-width: 640px;
  margin: 0 auto 3rem;
}

/* ============================================================
   布局 Layout
   ============================================================ */
.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.section {
  padding: clamp(3rem, 8vw, 6rem) 0;
}

.section-alt {
  background: var(--color-gray-50);
}

/* ============================================================
   按钮 Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(255, 122, 26, 0.35);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(255, 122, 26, 0.4);
}

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

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-light {
  background: var(--color-white);
  color: var(--color-primary);
}

.btn-light:hover {
  background: var(--color-primary-50);
}

.btn-lg {
  padding: 1rem 2.25rem;
  font-size: 1.05rem;
}

/* ============================================================
   头部 Header
   ============================================================ */
.header {
  position: fixed;
  top: 0;
  inset-inline: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-gray-100);
  z-index: 100;
  transition: box-shadow var(--transition);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-primary);
}

.logo svg {
  width: 36px;
  height: 36px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav a {
  font-weight: 500;
  color: var(--color-gray-600);
  position: relative;
  transition: color var(--transition);
}

.nav a::after {
  content: '';
  position: absolute;
  inset-inline: 0;
  bottom: -6px;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transition: transform var(--transition);
}

.nav a:hover,
.nav a.active {
  color: var(--color-primary);
}

.nav a:hover::after,
.nav a.active::after {
  transform: scaleX(1);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* 语言切换器 */
.lang-switcher {
  position: relative;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-gray-200);
  font-weight: 500;
  color: var(--color-gray-600);
  transition: all var(--transition);
}

.lang-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  inset-inline-end: 0;
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 160px;
  padding: 0.5rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition);
  z-index: 110;
}

.lang-switcher.open .lang-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-option {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-sm);
  text-align: start;
  transition: background var(--transition);
}

.lang-option:hover {
  background: var(--color-primary-50);
}

.lang-option .flag {
  font-size: 1.2rem;
}

.lang-option .name {
  font-weight: 500;
  color: var(--color-gray-700);
}

.lang-option.active {
  background: var(--color-primary-50);
}

.lang-option.active .name {
  color: var(--color-primary);
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-primary);
}

@media (max-width: 900px) {
  .menu-toggle {
    display: flex;
  }
  .nav {
    position: fixed;
    top: var(--header-height);
    inset-inline-start: 0;
    inset-inline-end: 0;
    flex-direction: column;
    background: var(--color-white);
    padding: 1.5rem;
    gap: 1.25rem;
    box-shadow: var(--shadow-lg);
    transform: translateY(-150%);
    transition: transform 0.35s ease;
  }
  html[dir='rtl'] .nav {
    transform: translateY(-150%);
  }
  .nav.open {
    transform: translateY(0);
  }
}

/* ============================================================
   通用卡片
   ============================================================ */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

/* 标签/徽章 */
.badge {
  display: inline-block;
  padding: 0.3rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
}

.badge-accent {
  background: var(--color-accent-50);
  color: var(--color-accent-dark);
}

.badge-primary {
  background: var(--color-primary-50);
  color: var(--color-primary);
}

/* 通用 section header */
.eyebrow {
  color: var(--color-accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.85rem;
  display: block;
  margin-bottom: 0.75rem;
}

/* 通用 grid */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}
.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}
.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 900px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 560px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* 工具类 */
.text-center {
  text-align: center;
}
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mb-4 { margin-bottom: 1rem; }
.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }

/* 页脚 */
.footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.75);
  padding: 4rem 0 0;
}

.footer a {
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition);
}

.footer a:hover {
  color: var(--color-accent);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2.5rem;
  padding-bottom: 3rem;
}

.footer-brand .logo {
  color: var(--color-white);
  margin-bottom: 1rem;
}

.footer-brand p {
  max-width: 300px;
  font-size: 0.9rem;
}

.footer-title {
  color: var(--color-white);
  font-size: 1.05rem;
  margin-bottom: 1.25rem;
  font-weight: 700;
}

.footer-links li {
  margin-bottom: 0.65rem;
  font-size: 0.9rem;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 1.5rem 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

.footer-social {
  display: flex;
  gap: 0.75rem;
}

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.footer-social a:hover {
  background: var(--color-accent);
  color: var(--color-white);
}

@media (max-width: 900px) {
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}
@media (max-width: 560px) {
  .footer-top {
    grid-template-columns: 1fr;
  }
}

/* 回到顶部 */
.back-top {
  position: fixed;
  bottom: 24px;
  inset-inline-end: 24px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-white);
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  z-index: 90;
  transition: all var(--transition);
}

.back-top:hover {
  background: var(--color-accent-dark);
  transform: translateY(-3px);
}

.back-top.show {
  display: flex;
}

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

.animate-up {
  animation: fadeInUp 0.6s ease both;
}

/* 通用响应式图片 */
.img-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 表单通用 */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-weight: 600;
  color: var(--color-gray-700);
  margin-bottom: 0.45rem;
  font-size: 0.9rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  transition: all var(--transition);
  background: var(--color-white);
  color: var(--color-gray-700);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(10, 43, 94, 0.1);
}

textarea.form-control {
  min-height: 120px;
  resize: vertical;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 560px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

/* 警告框 */
.alert {
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  margin-bottom: 1rem;
  display: none;
}

.alert-success {
  background: #ecfdf5;
  color: var(--color-success);
  border: 1px solid #a7f3d0;
}

.alert-error {
  background: #fef2f2;
  color: var(--color-danger);
  border: 1px solid #fecaca;
}

/* Cookie 弹窗 */
.cookie-bar {
  position: fixed;
  bottom: 0;
  inset-inline: 0;
  background: var(--color-white);
  box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.12);
  z-index: 200;
  padding: 1.25rem 0;
  transform: translateY(100%);
  transition: transform 0.4s ease;
}

.cookie-bar.show {
  transform: translateY(0);
}

.cookie-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.cookie-text {
  font-size: 0.9rem;
  color: var(--color-gray-600);
}

.cookie-text a {
  color: var(--color-primary);
  text-decoration: underline;
}

.cookie-actions {
  display: flex;
  gap: 0.75rem;
  flex-shrink: 0;
}

.cookie-actions .btn {
  padding: 0.6rem 1.25rem;
  font-size: 0.85rem;
}

@media (max-width: 700px) {
  .cookie-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* 在线聊天按钮 */
.chat-float {
  position: fixed;
  bottom: 90px;
  inset-inline-end: 24px;
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.chat-btn {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition);
}

.chat-btn:hover {
  transform: scale(1.08);
}

.chat-whatsapp {
  background: #25d366;
}
.chat-live {
  background: var(--color-primary);
}

.chat-tooltip {
  position: absolute;
  inset-inline-end: 66px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--color-white);
  color: var(--color-gray-700);
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  font-weight: 600;
  box-shadow: var(--shadow-md);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.chat-btn:hover .chat-tooltip {
  opacity: 1;
}

/* 加载状态 */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: var(--color-white);
  animation: spin 0.8s linear infinite;
}

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

/* 骨架屏 */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-gray-100) 25%,
    var(--color-gray-200) 50%,
    var(--color-gray-100) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.3s infinite;
  border-radius: var(--radius-md);
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}