/* ===================== 全局重置与基础 ===================== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

/* 主题变量（控制整站配色） */
:root {
  --bg-color: #ffffff;
  --text-color: #111827;
  --card-bg: #ffffff;
  --border-color: #81d8d0;         /* 蒂芙尼蓝 */
  --primary-color: #81d8d0;        /* 蒂芙尼蓝：标题/链接高亮 */
  --accent-pink: #ff4b8b;          /* 粉色：所有按钮 */
  --hover-bg: rgba(129,216,208,.08);  /* 蒂芙尼蓝的浅背景 */
  --shadow-soft: 0 1px 3px rgba(17,24,39,.08);
  --dark-rgb: 17,24,39;
  --tiffany-rgb: 129,216,208;
}

/* 系统暗色模式：仍然复用同一套颜色，不引入新 hex */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #111827;
    --text-color: #ffffff;
    --card-bg: #111827;
    --border-color: #81d8d0;
    --hover-bg: rgba(129,216,208,.16);
    --shadow-soft: 0 1px 3px rgba(0,0,0,.5);
  }
}

/* 手动深色模式开关（在 html 或 body 上加 .dark-mode） */
:root.dark-mode,
.dark-mode {
  --bg-color: #111827;
  --text-color: #ffffff;
  --card-bg: #111827;
  --border-color: #81d8d0;
  --hover-bg: rgba(129,216,208,.16);
  --shadow-soft: 0 1px 3px rgba(0,0,0,.5);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  transition: background-color .25s ease, color .25s ease;
}

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

a:hover {
  text-decoration: underline;
}

/* AdminLTE 内容背景统一 */
.content-wrapper {
  background-color: var(--bg-color);
}

/* ===================== 顶部导航 ===================== */
.main-header.navbar {
  border-bottom: 1px solid var(--border-color);
  background-color: var(--card-bg);
}

.navbar-brand .brand-text {
  font-weight: 700;
  letter-spacing: .5px;
}

.main-header .nav-link {
  color: var(--text-color);
  font-weight: 500;
}

.main-header .nav-link:hover {
  color: var(--primary-color);
}

/* 夜间模式按钮（用文字色 + 蒂芙尼 hover） */
.theme-toggle {
  background: none;
  border: none;
  color: var(--text-color);
  cursor: pointer;
  font-size: 1.1rem;
  padding: .25rem .5rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background-color .2s ease, transform .1s ease;
}

.theme-toggle:hover {
  background-color: var(--hover-bg);
  transform: translateY(-1px);
}

.theme-toggle:focus {
  outline: none;
  box-shadow: 0 0 0 2px rgba(var(--tiffany-rgb), .5);
}

.nav-theme-toggle {
  display: flex;
  align-items: center;
}

/* ===================== Google 搜索头部 ===================== */
.google-style-h1 {
  font-family: "Product Sans", Arial, sans-serif;
}

.google-style-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.google-style-h1 {
  font-size: 3rem;
  font-weight: 400;
  margin-top: 1.5rem;
  margin-bottom: .5rem;
  color: var(--text-color);
  word-wrap: break-word;
}

.google-style-subtitle {
  color: var(--text-color);
  opacity: .7;
  font-size: 1rem;
}

/* 搜索框容器 */
.google-search-wrapper {
  max-width: 600px;
  margin: 0 auto;
}

/* 搜索框样式 */
.google-search-container {
  display: flex;
  width: 100%;
  border-radius: 24px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  background: var(--card-bg);
  transition: box-shadow .2s ease, border-color .2s ease;
}

.google-search-container:focus-within {
  box-shadow: 0 1px 6px rgba(var(--dark-rgb), .15);
  border-color: transparent;
}

.google-search-input {
  flex: 1;
  border: none;
  padding: 12px 18px;
  font-size: 16px;
  background: transparent;
  color: var(--text-color);
  outline: none;
}

.google-search-input::placeholder {
  color: var(--text-color);
  opacity: .5;
}

/* 搜索按钮 = 粉色风格 */
.google-search-button {
  border: none;
  padding: 0 20px;
  background: var(--accent-pink);
  color: #ffffff;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: filter .15s ease, transform .1s ease;
  white-space: nowrap;
}

.google-search-button i {
  margin-right: 6px;
  font-size: 15px;
}

.google-search-button:hover {
  filter: brightness(1.05);
  transform: translateY(-1px);
}

.google-search-button:active {
  transform: translateY(0);
}

/* ===================== 视频区域 ===================== */
.video-container {
  text-align: center;
  margin-top: 1.75rem;
  margin-bottom: .5rem;
}

.video-wrapper {
  width: 100%;
  margin: 0 auto;
  position: relative;
}

.video-wrapper video {
  display: block;
  width: 100%;
  height: auto;
  border-radius: .75rem;
  background-color: #111827; /* 用文字色当视频底色 */
}

.video-caption {
  margin-top: .75rem;
  font-size: 1.05rem;
  color: var(--text-color);
  opacity: .7;
}

.copyright-note {
  margin-top: .25rem;
  font-size: .8rem;
  color: var(--text-color);
  opacity: .6;
}

/* ===================== 通用卡片与文章列表 ===================== */
.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  box-shadow: var(--shadow-soft);
}

.card-header {
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  color: var(--text-color);
}

.list-group-item {
  background-color: var(--card-bg);
  border-color: var(--border-color);
  color: var(--text-color);
}

.list-group-item:hover {
  background-color: var(--hover-bg);
}

.text-muted {
  color: var(--text-color) !important;
  opacity: .7;
}

/* 文章列表（相关视频） */
.article-list .list-group-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .75rem 1rem;
}

.article-list .title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
}

.article-list .meta {
  flex-shrink: 0;
  margin-left: .75rem;
  color: var(--text-color);
  opacity: .6;
  font-size: .8125rem;
}

/* ===================== CTA 区域（按钮粉色） ===================== */
.btn-cta {
  background: var(--accent-pink);
  border-color: var(--accent-pink);
  color: #ffffff;
  font-weight: 600;
  display: inline-block;
  width: 100%;
  animation: subtlePulse 1.6s ease-in-out infinite;
}

.btn-cta:hover {
  filter: brightness(1.05);
  color: #ffffff;
}

.btn-cta:focus {
  box-shadow: 0 0 0 .2rem rgba(255,75,139,.3);
  outline: 0;
}

/* ===================== 主内容 Section 样式 ===================== */
.main-content {
  width: 100%;
  margin-bottom: 2.5rem;
  padding: 0;
}

.section {
  margin-bottom: 2rem;
  background-color: var(--card-bg);
  padding: 1.5rem 1.25rem;
  border-radius: .75rem;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-soft);
}

.section-title {
  font-size: 1.35rem;
  margin-bottom: 1.25rem;
  color: var(--primary-color); /* 蒂芙尼蓝标题 */
  font-weight: 700;
  text-align: center;
}

/* 查询表单 */
.query-form {
  display: flex;
  flex-direction: column;
  gap: .75rem;
  max-width: 500px;
  margin: 0 auto 1rem;
}

.query-label {
  font-weight: 600;
  font-size: .9rem;
  color: var(--text-color);
  opacity: .75;
}

.query-input {
  padding: .5rem .75rem;
  font-size: 1rem;
  border: 1px solid var(--border-color);
  border-radius: .5rem;
  outline: none;
  background-color: var(--card-bg);
  color: var(--text-color);
}

.query-input::placeholder {
  color: var(--text-color);
  opacity: .5;
}

.query-input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 1px rgba(var(--tiffany-rgb), .4);
}

/* 查询按钮 = 粉色风格 */
.query-button {
  background-color: var(--accent-pink);
  color: #ffffff;
  padding: .6rem 1rem;
  font-size: 1rem;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 600;
  transition: filter .15s ease, transform .1s ease;
}

.query-button:hover {
  filter: brightness(1.05);
  transform: translateY(-1px);
}

.query-button:active {
  transform: translateY(0);
}

.tips {
  font-size: .85rem;
  color: var(--text-color);
  opacity: .7;
  text-align: center;
}

/* 轮播图：宽度占满当前 section */
.carousel-section .carousel {
  position: relative;
  width: 100%;
  margin: 0 auto;
  border-radius: .75rem;
  overflow: hidden;
  background-color: #111827;
}

.carousel-item {
  display: none;
  width: 100%;
}

.carousel-item img {
  width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
}

.carousel-item.active {
  display: block;
}

/* 轮播左右按钮：也用粉色 */
.carousel-control {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: var(--accent-pink);
  color: #ffffff;
  border: none;
  font-size: 1.5rem;
  padding: .4rem .7rem;
  cursor: pointer;
  z-index: 10;
  border-radius: 999px;
  line-height: 1;
  transition: filter .15s ease, transform .1s ease;
}

.carousel-control:hover {
  filter: brightness(1.05);
  transform: translateY(-52%);
}

.carousel-control.prev {
  left: .75rem;
}

.carousel-control.next {
  right: .75rem;
}

/* FAQ */
.faq-item {
  margin-bottom: 1rem;
}

.faq-question {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-color);
  margin-bottom: .35rem;
}

.faq-answer {
  font-size: .95rem;
  color: var(--text-color);
  opacity: .8;
  margin-left: 1.2rem;
}

.faq-answer li {
  margin-bottom: .3rem;
}

/* 评价 */
.review-item {
  margin-bottom: 1.1rem;
}

.review-user {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-color);
  margin-bottom: .3rem;
}

.review-text {
  font-size: .95rem;
  color: var(--text-color);
  opacity: .8;
  margin-left: 1.2rem;
}

/* 联系我们 */
.contact-section p,
.contact-section li {
  font-size: .95rem;
  color: var(--text-color);
}

.contact-section ul {
  padding-left: 1.25rem;
  margin-top: .5rem;
}

/* ===================== 友情链接 & 底部 ===================== */
.friend-link a {
  display: inline-block;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text-color);
  text-decoration: underline;
  word-break: break-all;
}

.friend-link a:hover {
  text-decoration: none;
}

.site-footer {
  color: var(--text-color);
  opacity: .7;
  font-size: .875rem;
  padding: 1.25rem 0 .5rem;
  border-top: 1px solid var(--border-color);
  margin-top: 1.5rem;
}

.site-footer a {
  text-decoration: underline;
}

.site-footer a:hover {
  text-decoration: none;
}

/* ===================== 动画与辅助 ===================== */
@keyframes subtlePulse {
  0%, 100% {
    opacity: .95;
    text-shadow: 0 0 0 rgba(255,75,139,.25);
  }
  50% {
    opacity: 1;
    text-shadow: 0 0 6px rgba(255,75,139,.35);
  }
}

@media (prefers-reduced-motion: reduce) {
  .btn-cta {
    animation: none;
  }
}

/* ===================== 响应式优化 ===================== */
@media (max-width: 767.98px) {
  .google-style-header {
    margin-bottom: 2rem;
  }

  .google-style-h1 {
    font-size: 2.3rem;
  }

  .google-search-wrapper {
    max-width: 100%;
    padding: 0 .5rem;
  }

  .card {
    box-shadow: none;
  }

  .main-content {
    margin-bottom: 2rem;
  }

  .section {
    padding: 1.25rem 1rem;
    border-radius: .75rem;
  }

  .btn-cta {
    width: 100%;
  }
}

@media (min-width: 576px) {
  .btn-cta {
    width: auto;
  }
}