/* ===================================
   NavHub · 精选导航
   现代化设计 · 亮暗双主题
   =================================== */

/* ----- CSS 变量定义 ----- */
:root {
    /* 亮色主题 */
    --bg-primary: #f7f8fc;
    --bg-secondary: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.65);
    --bg-glass-hover: rgba(255, 255, 255, 0.85);
    --bg-card: rgba(255, 255, 255, 0.72);
    --text-primary: #1a1b2e;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --border-color: rgba(0, 0, 0, 0.06);
    --border-hover: rgba(99, 102, 241, 0.25);
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.04), 0 4px 16px rgba(0, 0, 0, 0.04);
    --shadow-card-hover: 0 4px 12px rgba(99, 102, 241, 0.12), 0 8px 32px rgba(99, 102, 241, 0.08);
    --shadow-search: 0 2px 8px rgba(0, 0, 0, 0.04), 0 8px 32px rgba(0, 0, 0, 0.06);
    --accent: #6366f1;
    --accent-light: #818cf8;
    --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);
    --blob-1: #6366f1;
    --blob-2: #ec4899;
    --blob-3: #06b6d4;
    --chip-bg: rgba(99, 102, 241, 0.08);
    --chip-bg-hover: rgba(99, 102, 241, 0.12);
    --chip-active-bg: #6366f1;
    --chip-active-text: #ffffff;
    --grid-line: rgba(0, 0, 0, 0.03);
    --link-row-bg: rgba(0, 0, 0, 0.02);
    /* 动态配置变量（由 JS 覆盖） */
    --grid-min-width: 200px;
    --grid-gap: 16px;
    --card-padding: 16px;
    --card-radius: 14px;
    --card-opacity: 1;
}

[data-theme="dark"] {
    --bg-primary: #0f0f1a;
    --bg-secondary: #181828;
    --bg-glass: rgba(24, 24, 40, 0.65);
    --bg-glass-hover: rgba(30, 30, 50, 0.8);
    --bg-card: rgba(30, 30, 50, 0.6);
    --text-primary: #e5e7eb;
    --text-secondary: #9ca3af;
    --text-tertiary: #6b7280;
    --border-color: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(129, 140, 248, 0.3);
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.2), 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-card-hover: 0 4px 12px rgba(99, 102, 241, 0.2), 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-search: 0 2px 8px rgba(0, 0, 0, 0.2), 0 8px 32px rgba(0, 0, 0, 0.3);
    --accent: #818cf8;
    --accent-light: #a5b4fc;
    --accent-gradient: linear-gradient(135deg, #818cf8, #c084fc);
    --blob-1: #4f46e5;
    --blob-2: #be185d;
    --blob-3: #0891b2;
    --chip-bg: rgba(129, 140, 248, 0.1);
    --chip-bg-hover: rgba(129, 140, 248, 0.16);
    --chip-active-bg: #818cf8;
    --chip-active-text: #0f0f1a;
    --grid-line: rgba(255, 255, 255, 0.02);
    --link-row-bg: rgba(255, 255, 255, 0.03);
    /* 动态配置变量（由 JS 覆盖） */
    --grid-min-width: 200px;
    --grid-gap: 16px;
    --card-padding: 16px;
    --card-radius: 14px;
    --card-opacity: 1;
}

/* ----- 全局重置 ----- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background 0.4s ease, color 0.4s ease;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ----- 背景装饰层 ----- */
.bg-decoration {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.12;
    animation: blob-float 20s ease-in-out infinite;
}

.blob-1 {
    width: 500px;
    height: 500px;
    background: var(--blob-1);
    top: -100px;
    left: -80px;
    animation-delay: 0s;
}

.blob-2 {
    width: 400px;
    height: 400px;
    background: var(--blob-2);
    top: 200px;
    right: -100px;
    animation-delay: -7s;
}

.blob-3 {
    width: 450px;
    height: 450px;
    background: var(--blob-3);
    bottom: -100px;
    left: 30%;
    animation-delay: -14s;
}

@keyframes blob-float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(40px, -30px) scale(1.08); }
    66% { transform: translate(-30px, 40px) scale(0.95); }
}

.grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    background-size: 40px 40px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 80%);
}

/* ----- 自定义背景图片（后台配置，body.has-bg-image 时生效） ----- */
.has-bg-image .bg-decoration::before {
    content: '';
    position: absolute;
    inset: -2%;
    background-image: var(--bg-image-url);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: var(--bg-image-opacity, 0.9);
    filter: blur(var(--bg-image-blur, 0px));
    will-change: transform;
}

/* 遮罩层：默认跟随主题背景色，保证文字对比度 */
.has-bg-image .bg-decoration::after {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--bg-primary);
    opacity: var(--bg-overlay-opacity, 0.55);
}

/* 用户指定遮罩颜色时使用自定义色 */
.has-bg-image.bg-overlay-custom .bg-decoration::after {
    background: var(--bg-overlay-color, #000000);
}

/* ----- 顶部导航栏 ----- */
.top-bar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: background 0.4s ease, border-color 0.4s ease;
}

.top-bar-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Logo 可修改：emoji 模式 */
.logo-icon .logo-emoji {
    font-size: 24px;
    line-height: 1;
}

/* Logo 可修改：图片模式 */
.logo-icon .logo-img {
    width: 30px;
    height: 30px;
    object-fit: contain;
    border-radius: 8px;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.top-bar-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* ----- 顶部数字时钟（导航栏下方 · 主标题上方） ----- */
.clock-bar {
    position: relative;
    z-index: 1;
    padding: 22px 24px 3px;
    text-align: center;
    pointer-events: none;
}

.clock-time {
    font-size: 58px;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: 6px;
    font-variant-numeric: tabular-nums;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: opacity 0.3s ease;
}

.clock-time.tick {
    animation: clock-tick 0.6s ease;
}

@keyframes clock-tick {
    0% { opacity: 0.35; transform: translateY(3px); }
    60% { opacity: 1; transform: translateY(-1px); }
    100% { opacity: 1; transform: translateY(0); }
}

.clock-date {
    margin-top: 8px;
    font-size: 16px;
    letter-spacing: 2px;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-glass);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.theme-toggle:hover {
    border-color: var(--border-hover);
    background: var(--chip-bg);
    transform: scale(1.05);
}

.theme-toggle .icon-sun {
    display: block;
}

.theme-toggle .icon-moon {
    display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
    display: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
    display: block;
}

.theme-toggle svg {
    position: absolute;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease;
}

/* 隐藏描述模式 */
.hide-desc .site-desc {
    display: none;
}

.hide-desc .site-name {
    margin-bottom: 0;
}

/* ----- 搜索区域 ----- */
.search-section {
    position: relative;
    z-index: 1;
    padding: 22px 24px 40px;
    text-align: center;
}

.search-container {
    max-width: 640px;
    margin: 0 auto;
}

.search-title {
    font-size: 42px;
    font-weight: 900;
    letter-spacing: -1.5px;
    line-height: 1.2;
    margin-bottom: 8px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: title-slide-in 0.6s ease;
}

@keyframes title-slide-in {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.search-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-weight: 400;
    animation: title-slide-in 0.6s ease 0.1s both;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 0 16px;
    height: 56px;
    box-shadow: var(--shadow-search);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    animation: title-slide-in 0.6s ease 0.2s both;
}

.search-box:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--chip-bg), var(--shadow-search);
}

.search-icon {
    color: var(--text-tertiary);
    flex-shrink: 0;
    transition: color 0.3s ease;
}

.search-box:focus-within .search-icon {
    color: var(--accent);
}

.search-input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    font-size: 15px;
    color: var(--text-primary);
    padding: 0 12px;
    height: 100%;
    font-family: inherit;
}

.search-input::placeholder {
    color: var(--text-tertiary);
}

.search-kbd {
    font-size: 11px;
    font-weight: 500;
    color: var(--text-tertiary);
    background: var(--chip-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 3px 7px;
    font-family: inherit;
    flex-shrink: 0;
    transition: opacity 0.2s ease;
}

.search-box:focus-within .search-kbd {
    opacity: 0;
}

.search-clear {
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: var(--text-tertiary);
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.2s ease;
}

.search-clear.visible {
    display: flex;
}

.search-clear:hover {
    background: var(--chip-bg);
    color: var(--text-primary);
}

/* 搜索引擎快捷入口 */
.search-engines {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 16px;
    flex-wrap: wrap;
    animation: title-slide-in 0.6s ease 0.3s both;
}

.engine-btn {
    padding: 6px 16px;
    font-size: 13px;
    font-weight: 500;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    background: var(--bg-glass);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.25s ease;
    font-family: inherit;
}

.engine-btn:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.engine-btn.active {
    background: var(--chip-active-bg);
    color: var(--chip-active-text);
    border-color: transparent;
}

/* ----- 分类筛选栏 ----- */
.category-bar {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px 24px;
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.category-chip {
    padding: 8px 18px;
    font-size: 14px;
    font-weight: 500;
    border: 1px solid var(--border-color);
    border-radius: 24px;
    background: var(--bg-glass);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.25s ease;
    font-family: inherit;
    white-space: nowrap;
}

.category-chip:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
    background: var(--chip-bg-hover);
    transform: translateY(-2px);
}

.category-chip.active {
    background: var(--chip-active-bg);
    color: var(--chip-active-text);
    border-color: transparent;
    box-shadow: 0 2px 12px rgba(99, 102, 241, 0.25);
}

/* ----- 卡片区域 ----- */
.cards-section {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px 80px;
}

/* 分类分组 */
.category-group {
    margin-bottom: 48px;
    animation: fade-in-up 0.5s ease;
}

@keyframes fade-in-up {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

.category-group:last-child {
    margin-bottom: 0;
}

.category-group-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.category-group-title::before {
    content: '';
    width: 4px;
    height: 20px;
    border-radius: 2px;
    background: var(--accent-gradient);
}

.category-group-count {
    font-size: 13px;
    font-weight: 400;
    color: var(--text-tertiary);
    margin-left: 4px;
}

/* 卡片网格 */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(var(--grid-min-width, 200px), 1fr));
    gap: var(--grid-gap, 16px);
}

/* 单个卡片 */
.site-card {
    display: flex;
    flex-direction: column;
    min-height: var(--card-min-height, 0px);
    background: color-mix(in srgb, var(--bg-card) calc(var(--card-opacity, 1) * 100%), transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--card-radius, 14px);
    text-decoration: none;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-card);
    position: relative;
    overflow: hidden;
}

/* 卡片主跳转区（flex:1 撑开剩余高度，卡片调高时把底部链接行顶到下边缘） */
.site-card-main {
    display: flex;
    align-items: center;
    gap: 14px;
    flex: 1 1 auto;
    padding: var(--card-padding, 16px) calc(var(--card-padding, 16px) + 2px);
    text-decoration: none;
    color: var(--text-primary);
    cursor: pointer;
}

/* 卡片底部：链接 + 复制按钮（margin-top:auto 确保始终贴在卡片下边缘） */
.site-link-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: auto;
    padding: 7px calc(var(--card-padding, 16px) + 2px);
    border-top: 1px solid var(--border-color);
    background: color-mix(in srgb, var(--link-row-bg) calc(var(--card-opacity, 1) * 100%), transparent);
}

.site-url {
    flex: 1;
    min-width: 0;
    font-size: 11px;
    color: var(--text-tertiary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-variant-numeric: tabular-nums;
}

.site-copy-btn {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    font-size: 11px;
    font-family: inherit;
    line-height: 1;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.site-copy-btn:hover {
    color: var(--chip-active-text);
    background: var(--chip-active-bg);
    border-color: transparent;
    transform: translateY(-1px);
}

.site-copy-btn:active {
    transform: translateY(0) scale(0.96);
}

.site-copy-btn.copied {
    color: #fff;
    background: #22c55e;
    border-color: transparent;
}

.site-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    border-radius: var(--card-radius, 14px);
}

.site-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-card-hover);
    background: color-mix(in srgb, var(--bg-glass-hover) calc(var(--card-opacity, 1) * 100%), transparent);
}

.site-card:active {
    transform: translateY(-1px);
}

.site-card:hover .site-favicon {
    transform: scale(1.1);
}

.site-favicon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    transition: transform 0.3s ease;
    position: relative;
}

/* 自动识别的 Logo 图片（尽量占满方框：40px 容器内 36px 图标，四周仅留 2px；细描边） */
.site-favicon .favicon-img {
    width: 36px;
    height: 36px;
    object-fit: contain;
    border-radius: 2px;
    background: rgba(255, 255, 255, 0.92);
    box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.04);
    display: block;
}

/* Logo 加载失败时回退字母图标（20px 与占满后的图片观感一致） */
.site-favicon .favicon-letter {
    display: none;
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    line-height: 1;
}

.site-favicon .favicon-img.failed {
    display: none;
}

.site-favicon .favicon-img.failed + .favicon-letter {
    display: block;
}

.site-info {
    flex: 1;
    min-width: 0;
}

.site-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 3px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color 0.3s ease;
}

.site-desc {
    font-size: 12px;
    color: var(--text-secondary);
    white-space: normal;
    word-break: break-word;
    overflow-wrap: anywhere;
    line-height: 1.45;
}

.site-card:hover .site-name {
    color: var(--accent);
}

/* 卡片内高亮文字 */
.highlight {
    background: var(--accent);
    color: #fff;
    border-radius: 2px;
    padding: 0 2px;
}

/* ----- 空状态 ----- */
.empty-state {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 80px 24px;
    color: var(--text-tertiary);
}

.empty-state svg {
    margin-bottom: 16px;
    opacity: 0.4;
}

.empty-state p {
    font-size: 15px;
}

/* ----- 页脚 ----- */
.footer {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 32px 24px;
    color: var(--text-tertiary);
    font-size: 13px;
    border-top: 1px solid var(--border-color);
}

/* ----- 响应式 ----- */
@media (max-width: 768px) {
    .clock-bar {
        padding: 14px 16px 2px;
    }

    .clock-time {
        font-size: 42px;
        letter-spacing: 4px;
    }

    .clock-date {
        font-size: 13px;
        letter-spacing: 1px;
    }

    .search-section {
        padding: 14px 20px 32px;
    }

    .search-title {
        font-size: 32px;
    }

    .search-subtitle {
        font-size: 14px;
    }

    .search-box {
        height: 50px;
    }

    .search-kbd {
        display: none;
    }

    .top-bar-inner {
        padding: 0 16px;
        height: 56px;
    }

    .category-bar {
        padding: 0 16px 20px;
        gap: 6px;
    }

    .category-chip {
        padding: 6px 14px;
        font-size: 13px;
    }

    .cards-section {
        padding: 0 16px 60px;
    }

    .cards-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 12px;
    }

    .site-card-main {
        padding: 12px 14px;
        gap: 10px;
    }

    .site-link-row {
        padding: 6px 14px;
    }

    .site-favicon {
        width: 36px;
        height: 36px;
        font-size: 16px;
    }

    .site-favicon .favicon-img {
        width: 32px;
        height: 32px;
    }

    .site-name {
        font-size: 13px;
    }

    .site-desc {
        font-size: 11px;
    }

    .category-group {
        margin-bottom: 36px;
    }
}

@media (max-width: 480px) {
    .clock-time {
        font-size: 34px;
        letter-spacing: 3px;
    }

    .search-title {
        font-size: 26px;
    }

    .cards-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }

    .site-card-main {
        flex-direction: column;
        text-align: center;
        padding: 14px 10px;
    }

    .site-info {
        text-align: center;
    }

    .site-desc {
        display: none;
    }

    .site-link-row {
        padding: 6px 10px;
    }
}

/* ----- 减少动画偏好 ----- */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }

    .blob {
        animation: none;
    }
}

/* ----- 选中文字样式 ----- */
::selection {
    background: var(--accent);
    color: #fff;
}

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

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--text-tertiary);
    border-radius: 4px;
    opacity: 0.3;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}