/* --- 设计升级：全局变量 --- */
:root {
  --primary-color-start: #3B82F6;
  --primary-color-end: #60A5FA;
  --bg-color: #F9FAFB;
  --card-bg-color: #FFFFFF;
  --heading-text-color: #1F2937;
  --body-text-color: #4B5563;
  --subtle-text-color: #9CA3AF;
  --border-color: #E5E7EB;          
  --shadow-color: rgba(99, 102, 241, 0.1);
  --shadow-hover-color: rgba(99, 102, 241, 0.2);
}

:root[data-theme="dark"] {
  --bg-color: #18181B;
  --card-bg-color: #27272A;
  --heading-text-color: #F4F4F5;
  --body-text-color: #A1A1AA;
  --subtle-text-color: #71717A;
  --border-color: #3f3f46;          
  --shadow-color: rgba(0, 0, 0, 0.2);
  --shadow-hover-color: rgba(0, 0, 0, 0.3);
}

/* --- 基础样式 --- */
body {
  font-family: 'Inter', "PingFang SC", "Microsoft YaHei", sans-serif;
  margin: 0;
  background-color: var(--bg-color);
  color: var(--body-text-color);
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px;
}

/* --- 提醒与公告 --- */
.main-warning {
  background-color: #FFF1F2;
  color: #991B1B;
  border: 1px solid #FECDD3;
  border-left: 5px solid #F87171;
  border-radius: 8px;
  padding: 15px 20px;
  margin-bottom: 30px;
  font-weight: 600;
  text-align: center;
  user-select: none;
}

[data-theme="dark"] .main-warning {
    background-color: #450a0a;
    color: #FCA5A5;
    border-color: #7f1d1d;
    border-left-color: #F87171;
}

.alert {
  background-color: #FEFCE8;
  color: #A16207;
  border: 1px solid #FDE68A;
  border-radius: 8px;
  margin-bottom: 30px;
  text-align: center;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

[data-theme="dark"] .alert {
  background-color: #3f3f46;
  color: #FDE68A;
  border-color: #71717A;
}

.rotating-alert-box {
  min-height: 35px;
  overflow: hidden;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
}

.alert-message {
  position: absolute;
  width: 100%;
  opacity: 0;
  white-space: nowrap;
  transition: opacity 0.8s ease-in-out;
  text-align: center;
}

.alert-message.active {
  opacity: 1;
}

.alert-text-content {
  display: inline-block;
}

.alert-message.scrolling .alert-text-content {
  animation-name: marquee-scroll;
  animation-timing-function: linear;
  animation-iteration-count: 1;
  will-change: transform;
}

@keyframes marquee-scroll {
  from { transform: translateX(0); }
  to { /* JS 动态设置 */ }
}

/* --- 搜索与筛选 --- */
.search-bar {
  margin-bottom: 30px;
  display: flex;
  gap: 15px;
  align-items: center;
}

.search-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
  flex-grow: 1;
}

.search-bar input {
    width: 100%;
    padding: 12px 90px 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background-color: var(--card-bg-color);
    color: var(--body-text-color);
    font-size: 1em;
    outline: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    transition: all 0.2s ease;
    box-sizing: border-box;
}

.search-bar input:focus {
    border-color: var(--primary-color-end);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

[data-theme="dark"] .search-bar input {
    background-color: var(--card-bg-color);
    color: var(--heading-text-color);
    border-color: var(--border-color);
}

.clear-btn {
    position: absolute;
    right: 15px;
    cursor: pointer;
    color: var(--subtle-text-color);
    font-size: 1.2em;
    font-weight: bold;
    background: none;
    border: none;
    padding: 0;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    transition: color 0.2s ease;
}

.clear-btn:hover {
    color: var(--body-text-color);
}

.filter-btn {
    position: absolute;
    right: 45px;
    top: 50%;
    transform: translateY(-50%);
    height: 36px;
    width: 36px;
    border-radius: 50%;
    background-color: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--subtle-text-color);
    transition: background-color 0.2s ease, color 0.2s ease;
}

.filter-btn:hover {
    background-color: var(--bg-color);
    color: var(--body-text-color);
}

.filter-btn svg {
    pointer-events: none;
}

.filter-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.filter-modal.visible {
    opacity: 1;
    pointer-events: auto;
}

.filter-modal-content {
    background-color: var(--card-bg-color);
    border-radius: 16px;
    width: 90%;
    max-width: 500px;
    padding: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transform: scale(0.95);
    transition: transform 0.3s ease;
}

.filter-modal.visible .filter-modal-content {
    transform: scale(1);
}

.filter-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 15px;
    margin-bottom: 15px; /* 将外边距改为15px */
    border-bottom: 1px solid var(--border-color);
}

.filter-modal-title {
    font-size: 1.2em;
    font-weight: 600;
    color: var(--heading-text-color);
}

.filter-modal-close {
    background: none;
    border: none;
    font-size: 1.8em;
    color: var(--subtle-text-color);
    cursor: pointer;
    line-height: 1;
    padding: 0;
}

.filter-options {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.filter-option-tag {
    padding: 8px 16px;
    border-radius: 20px;
    background-color: var(--bg-color);
    color: var(--body-text-color);
    cursor: pointer;
    font-size: 0.95em;
    transition: background-color 0.2s ease, color 0.2s ease;
    border: 1px solid var(--border-color);
}

.filter-option-tag:hover {
    background-color: var(--border-color);
}

.filter-option-tag.active {
    background-color: var(--primary-color-start);
    color: #fff;
    border-color: var(--primary-color-start);
    font-weight: 500;
}

/* --- 卡片样式 --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 30px;
}

.card {
  background-color: var(--card-bg-color);
  border-radius: 16px;
  border: 1px solid var(--border-color);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s, box-shadow 0.3s;
  box-shadow: 0 4px 6px -1px var(--shadow-color), 0 2px 4px -2px var(--shadow-color);
}
.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 10px 15px -3px var(--shadow-hover-color), 0 4px 6px -4px var(--shadow-hover-color);
}

.card-header {
  display: flex;
  align-items: center;
  margin-bottom: 16px;
}

.icon-background {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    margin-right: 16px;
    background-color: var(--bg-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.card-icon {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0;
}

/* --- 新增：无图标卡片的样式变体 --- */

/* 当 card 同时有 no-icon 类时应用以下样式 */
.card.no-icon .card-header {
    justify-content: center; /* 头部内容居中 */
    text-align: center;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color); /* 增加一条分割线代替图标 */
}

.card.no-icon .card-title {
    font-size: 1.35em; /* 标题字号可以稍微大一点 */
}

.lazy-icon {
  opacity: 0;
  transition: opacity 0.5s ease-in-out;
}

.lazy-icon.loaded {
  opacity: 1;
}

.card-title {
  font-size: 1.25em;
  font-weight: 600;
  color: var(--heading-text-color);
  margin: 0;
}

.card-description {
  font-size: 0.95em;
  color: var(--body-text-color);
  flex-grow: 1;
  margin-bottom: 20px;
  line-height: 1.5;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  text-overflow: ellipsis;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.update-time {
  font-size: 0.85em;
  color: var(--subtle-text-color);
}

.install-btn {
  background-image: linear-gradient(to right, var(--primary-color-start) 0%, var(--primary-color-end) 100%);
  color: white;
  text-decoration: none;
  padding: 10px 24px;
  border-radius: 20px;
  font-weight: 500;
  font-size: 0.9em;
  transition: all 0.3s ease;
  border: none;
  box-shadow: 0 4px 6px rgba(59, 130, 246, 0.2);
}
.install-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 7px 10px rgba(59, 130, 246, 0.3);
}

.no-results {
    text-align: center;
    grid-column: 1 / -1;
    padding: 40px 0;
    color: var(--subtle-text-color);
}

/* --- 页脚样式 (尺寸优化版) --- */
.site-footer {
  text-align: center;
  padding: 15px 20px; /* 减小了上下的内边距 */
  margin-top: 30px; /* 减小了与上方内容的距离 */
  border-top: 1px solid var(--border-color);
  font-size: 0.9em;
  color: var(--subtle-text-color);
}

.site-footer p {
  margin: 5px 0;
}

.site-footer a {
  color: var(--body-text-color);
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s;
}

.site-footer a:hover {
  color: var(--primary-color-start);
  text-decoration: underline;
}

.brand-name {
    font-weight: bold;
}

/* --- 文本页面样式 --- */
.page-header {
  text-align: left;
  padding: 20px 0;
  margin-bottom: 30px; /* 将外边距改为30px */
  border-bottom: 1px solid var(--border-color);
}

/* --- 响应式优化 --- */
@media (max-width: 768px) {
    .container {
        padding: 20px 15px;
    }
    
    .main-warning,
    .rotating-alert-box {
        padding: 12px 15px;
        font-size: 0.9em;
        margin-bottom: 20px;
    }

    .search-bar {
        flex-direction: column;
    }
}

/* --- 终极版 Banner 轮播样式 --- */
.banner-container {
  position: relative;
  overflow: hidden;
  height: 250px;
  border-radius: 20px;
  margin-bottom: 40px;
  box-shadow: 0 10px 25px -5px rgba(59, 130, 246, 0.2);
  -webkit-user-select: none;
  user-select: none;
}

.banner-wrapper {
  display: flex;
  height: 100%;
}

.banner-slide {
  flex-shrink: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.banner-slide a {
  display: block;
  width: 100%;
  height: 100%;
}

.banner-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: rgba(0, 0, 0, 0.3);
  color: white;
  border: none;
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  opacity: 0;
  transition: opacity 0.3s ease, background-color 0.3s ease;
}

.banner-container:hover .banner-nav {
  opacity: 1;
}

.banner-nav:hover {
  background-color: rgba(0, 0, 0, 0.6);
}

.banner-nav.prev {
  left: 15px;
}

.banner-nav.next {
  right: 15px;
}

@media (max-width: 768px) {
  .banner-nav {
    display: none;
  }
}

.banner-dots {
  position: absolute;
  bottom: 15px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 10;
}

.banner-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  transition: all 0.3s ease;
}

.banner-dot:hover {
  background-color: rgba(255, 255, 255, 0.8);
}

.banner-dot.active {
  background-color: white;
  width: 20px;
  border-radius: 4px;
}

[data-theme="dark"] .banner-dot {
  border: 1px solid rgba(255, 255, 255, 0.5);
  background-color: transparent;
}
[data-theme="dark"] .banner-dot.active {
  background-color: white;
  border-color: white;
}
/* --- 新增：置顶警告框样式 --- */
.warning-box {
  background-color: #FFFBEB; /* 淡黄色背景 */
  color: #B45309; /* 深黄色/棕色文字 */
  border: 1px solid #FDE68A;
  border-left: 5px solid #F59E0B; /* 左侧有加粗的强调线 */
  border-radius: 8px;
  padding: 15px 20px;
  margin-bottom: 30px;
  font-weight: 500;
}

/* 暗黑模式下的警告框 */
[data-theme="dark"] .warning-box {
    background-color: #422006;
    color: #FDE047;
    border-color: #78350F;
    border-left-color: #F59E0B;
}
/* --- 新增：“回到顶部”按钮样式 --- */
.back-to-top-btn {
    position: fixed; /* 固定在视口位置 */
    bottom: 30px;
    right: 30px;
    width: 45px;
    height: 45px;
    background-color: var(--card-bg-color);
    color: var(--accent-color);
    border: 1px solid var(--border-color);
    border-radius: 50%; /* 圆形 */
    font-size: 22px;
    font-weight: bold;
    cursor: pointer;
    z-index: 1000;
    
    /* 默认隐藏 */
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px); /* 从下方滑入 */
    
    display: flex;
    align-items: center;
    justify-content: center;
    
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease-in-out;
}

/* 按钮可见时的样式 */
.back-to-top-btn.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top-btn:hover {
    background-color: var(--accent-color);
    color: #fff;
    box-shadow: 0 6px 16px rgba(0, 122, 255, 0.3);
}

/* 暗黑模式下的 hover 效果 */
[data-theme="dark"] .back-to-top-btn:hover {
    color: #fff;
    background-color: var(--accent-hover);
}
/* --- 新增：Tab 切换与粘性导航样式 --- */

/* 1. Tab 导航栏 (粘性头部) */
.tab-nav {
    position: -webkit-sticky; /* 兼容 Safari */
    position: sticky;
    top: 0; /* 粘在屏幕顶部 */
    background-color: var(--bg-color); /* 需要背景色以覆盖下方内容 */
    padding: 15px 0 0 0; /* 顶部留出空间 */
    z-index: 100; /* 确保在内容之上 */
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 30px;
    display: flex;
    gap: 20px; /* 按钮之间的间距 */
}

/* 2. Tab 按钮 */
.tab-btn {
    background: none;
    border: none;
    padding: 10px 5px; /* 调整按钮的点击区域 */
    font-size: 1.2em;
    font-weight: 600;
    color: var(--subtle-text-color); /* 未选中时的颜色 */
    cursor: pointer;
    position: relative;
    transition: color 0.3s ease;
}

.tab-btn:hover {
    color: var(--heading-text-color);
}

/* 3. Tab 按钮的激活状态 */
.tab-btn.active {
    color: var(--heading-text-color); /* 选中时的颜色 */
}

/* 激活状态的下划线 */
.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background-color: var(--primary-color-start);
    border-radius: 2px;
}

/* 4. Tab 内容面板 */
.tab-pane {
    display: none; /* 默认所有面板都隐藏 */
}

.tab-pane.active {
    display: block; /* 只有带 active 类的面板才显示 */
}
/* --- About Page Styles --- */
.banner-title {
    font-size: 2.5em;
    font-weight: 700;
    text-align: center;
    color: var(--heading-text-color);
    margin: 40px 0 60px;
    letter-spacing: 2px;
}

.about-section {
    margin-bottom: 60px;
}

.about-section h2 {
    font-size: 1.8em;
    color: var(--heading-text-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
    margin-bottom: 25px;
}

.intro-content p {
    font-size: 1.05em;
    line-height: 1.8;
    margin-bottom: 20px;
}

.philosophy-list {
    list-style: none;
    padding-left: 0;
}

.philosophy-list li {
    font-size: 1.05em;
    padding-left: 30px;
    position: relative;
    margin-bottom: 15px;
}

.philosophy-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    top: 2px;
    color: var(--primary-color-start);
    font-weight: bold;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.contact-item {
    background-color: var(--card-bg-color);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    padding: 30px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.contact-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px var(--shadow-hover-color);
}

.contact-icon {
    width: 64px;
    height: 64px;
    color: var(--primary-color-start);
    margin-bottom: 20px;
}

.contact-icon svg {
    width: 100%;
    height: 100%;
}

.contact-item .item-title {
    font-size: 1.2em;
    font-weight: 600;
    color: var(--heading-text-color);
    margin-bottom: 10px;
}

.contact-item .contact-link {
    text-decoration: none;
    color: var(--body-text-color);
    font-weight: 500;
    background-color: var(--bg-color);
    padding: 8px 16px;
    border-radius: 20px;
    transition: background-color 0.2s, color 0.2s;
    border: 1px solid var(--border-color);
}

.contact-item .contact-link:hover {
    background-color: var(--primary-color-start);
    border-color: var(--primary-color-start);
    color: #fff;
}


@media (max-width: 768px) {
    .banner-title {
        font-size: 2em;
        margin: 30px 0 40px;
    }
    .about-section h2 {
        font-size: 1.5em;
    }
}
/* --- 嵌入式反馈表单样式 --- */
.embedded-form {
    background-color: var(--card-bg-color);
    padding: 25px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    margin-top: 20px;
}

.feedback-form .form-group {
    margin-bottom: 15px;
}

.feedback-form label {
    display: block;
    font-size: 0.9em;
    font-weight: 500;
    color: var(--heading-text-color);
    margin-bottom: 5px;
}

.feedback-form input[type="email"],
.feedback-form select,
.feedback-form textarea {
    width: 100%;
    box-sizing: border-box;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-color);
    color: var(--body-text-color);
    font-family: 'Inter', sans-serif;
    font-size: 0.95em;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.feedback-form input[type="email"]:focus,
.feedback-form select:focus,
.feedback-form textarea:focus {
    border-color: var(--primary-color-start);
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.feedback-form select {
    appearance: none;
    -webkit-appearance: none;
    background-image: url('data:image/svg+xml;utf8,<svg fill="currentColor" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M7 10l5 5 5-5z"/></svg>');
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 16px;
    padding-right: 30px;
}

html[data-theme="dark"] .feedback-form select {
    background-image: url('data:image/svg+xml;utf8,<svg fill="white" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M7 10l5 5 5-5z"/></svg>');
}

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

.feedback-form .submit-feedback-btn {
    display: block;
    width: 100%;
    padding: 12px 20px;
    margin-top: 10px; /* 调整了间距 */
    border: none;
    border-radius: 8px;
    background-color: var(--primary-color-start);
    color: #fff;
    font-size: 1.05em;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
    text-align: center;
    box-sizing: border-box;
}

.feedback-form .submit-feedback-btn:hover {
    background-color: var(--primary-color-end);
    transform: translateY(-2px);
}

.feedback-form .submit-feedback-btn:disabled {
    background-color: var(--subtle-text-color);
    cursor: not-allowed;
    transform: none;
}

.required-asterisk {
    color: #ff4d4f;
    margin-left: 2px;
}

/* 提交状态消息样式 */
.form-status-message {
    margin-top: 15px;
    text-align: center;
    font-weight: 500;
    font-size: 0.95em;
    padding: 10px;
    border-radius: 8px;
}

.form-status-message.success {
    background-color: #e6f7ff;
    border: 1px solid #91d5ff;
    color: #096dd9;
}

html[data-theme="dark"] .form-status-message.success {
    background-color: #112a45;
    border-color: #177ddc;
    color: #69c0ff;
}

.form-status-message.error {
    background-color: #fff1f0;
    border: 1px solid #ffa39e;
    color: #cf1322;
}

html[data-theme="dark"] .form-status-message.error {
    background-color: #3c1d1f;
    border-color: #a61d24;
    color: #ff7875;
}