/* ============================================================
   Nomic Reader Privacy Policy Hub
   配色 token 严格对齐 lib/core/theme/app_color.dart
   支持 light / dark 双主题（prefers-color-scheme）
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    /* === Color tokens（来自 app_color.dart lightColorScheme） === */
    --color-primary: #22242C;
    --color-on-primary: #FFFFFF;
    --color-primary-container: #FFFFFF;
    --color-on-primary-container: #A7B0C3;

    --color-secondary: #54586A;
    --color-on-secondary: #FFFFFF;
    --color-secondary-container: #D9DEE5;
    --color-on-secondary-container: #949BB6;

    --color-tertiary: #748099;
    --color-accent: #4771C6;

    --color-surface: #F1F3F7;
    --color-surface-bright: #FDFDFD;
    --color-surface-dim: #E2E5EB;
    --color-surface-container: #E9EBED;
    --color-surface-container-low: #EBEDF0;
    --color-surface-container-lowest: #FFFFFF;

    --color-on-surface: #252939;
    --color-on-surface-variant: #9FABBC;

    --color-outline: #C6CEDF;
    --color-outline-variant: #BDC2CC;

    --color-success: #3FC588;
    --color-warning: #FF9800;
    --color-error: #F77373;

    /* === 背景渐变（app_color.dart lightBackgroundGradient） === */
    --bg-gradient: linear-gradient(
        to bottom right,
        #D3DBE8 0%,
        #DFE5EE 25%,
        #F1F3F7 50%,
        #F1F3F7 100%
    );

    /* === 字体 === */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI',
        'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo,
        monospace;

    /* === Spacing scale（4/8 节奏） === */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;

    /* === Radius === */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-pill: 999px;

    /* === Shadow（克制、扁平） === */
    --shadow-xs: 0 1px 2px rgba(34, 36, 44, 0.04);
    --shadow-sm: 0 2px 8px rgba(34, 36, 44, 0.06);
    --shadow-md: 0 6px 20px rgba(34, 36, 44, 0.08);
    --shadow-lg: 0 16px 40px rgba(34, 36, 44, 0.10);

    /* === Motion === */
    --motion-fast: 150ms;
    --motion-base: 220ms;
    --motion-slow: 320ms;
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);

    /* === Layout === */
    --container-max: 920px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-primary: #F0F0F4;
        --color-on-primary: #22242C;
        --color-primary-container: #1B1C21;
        --color-on-primary-container: #8D90A6;

        --color-secondary: #C3CAE5;
        --color-on-secondary: #3D4462;
        --color-secondary-container: #3F4353;
        --color-on-secondary-container: #ABB1C6;

        --color-tertiary: #C8C6F2;
        --color-accent: #6E94D9;

        --color-surface: #1C1C20;
        --color-surface-bright: #23242A;
        --color-surface-dim: #1C1C20;
        --color-surface-container: #22242C;
        --color-surface-container-low: #1E2026;
        --color-surface-container-lowest: #18181C;

        --color-on-surface: #C6CAD9;
        --color-on-surface-variant: #8D90A6;

        --color-outline: #393C48;
        --color-outline-variant: #2B2D38;

        --bg-gradient: linear-gradient(
            to bottom,
            #1E222C 0%,
            #17191F 30%,
            #121215 100%
        );

        --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.30);
        --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.35);
        --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.45);
        --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.55);
    }
}

/* ============================================================
   全局重置
   ============================================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    line-height: 1.7;
    color: var(--color-on-surface);
    background: var(--bg-gradient);
    background-attachment: fixed;
    min-height: 100vh;
    padding: var(--space-6);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* ============================================================
   Container（站点主卡片）
   ============================================================ */

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    background: var(--color-surface-container-lowest);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    border: 1px solid var(--color-outline);
}

/* ============================================================
   首页 Header
   ============================================================ */

header {
    background: var(--color-primary);
    color: var(--color-on-primary);
    padding: var(--space-12) var(--space-8);
    text-align: center;
}

header h1 {
    font-size: 2.4em;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-2);
}

.subtitle {
    font-size: 1.05em;
    font-weight: 500;
    color: var(--color-on-primary-container);
    margin-bottom: var(--space-3);
    letter-spacing: 0.02em;
}

.description {
    font-size: 0.95em;
    color: var(--color-on-primary-container);
    opacity: 0.85;
}

/* ============================================================
   首页应用网格
   ============================================================ */

main {
    padding: var(--space-10) var(--space-8);
}

.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-6);
}

.app-card {
    display: flex;
    flex-direction: column;
    background: var(--color-surface-container-lowest);
    border: 1px solid var(--color-outline);
    border-radius: var(--radius-md);
    padding: var(--space-8);
    text-decoration: none;
    color: inherit;
    cursor: pointer;
    transition: transform var(--motion-base) var(--ease-out),
        box-shadow var(--motion-base) var(--ease-out),
        border-color var(--motion-base) var(--ease-out);
}

.app-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.app-card:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

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

.app-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-secondary-container);
    color: var(--color-secondary);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-5);
}

.app-icon svg {
    width: 28px;
    height: 28px;
    stroke-width: 1.8;
}

.app-card h2 {
    color: var(--color-primary);
    font-size: 1.35em;
    font-weight: 600;
    margin-bottom: var(--space-2);
    letter-spacing: -0.01em;
}

.app-package {
    color: var(--color-on-surface-variant);
    font-size: 0.82em;
    font-family: var(--font-mono);
    margin-bottom: var(--space-3);
}

.app-description {
    color: var(--color-on-surface);
    font-size: 0.92em;
    line-height: 1.6;
    margin-bottom: var(--space-5);
    flex: 1;
}

.view-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-accent);
    font-weight: 600;
    font-size: 0.92em;
}

/* ============================================================
   隐私政策页 Header
   ============================================================ */

.policy-header {
    background: var(--color-primary);
    color: var(--color-on-primary);
    padding: var(--space-10) var(--space-8);
    text-align: center;
}

.policy-header h1 {
    font-size: 2.0em;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-2);
}

.app-name {
    font-size: 1.05em;
    font-weight: 500;
    color: var(--color-on-primary-container);
    margin-bottom: var(--space-2);
}

.last-updated {
    font-size: 0.88em;
    color: var(--color-on-primary-container);
    opacity: 0.8;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    margin-top: var(--space-4);
    padding: var(--space-2) var(--space-4);
    color: var(--color-on-primary);
    text-decoration: none;
    font-size: 0.88em;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-pill);
    transition: background var(--motion-fast) var(--ease-standard),
        border-color var(--motion-fast) var(--ease-standard);
}

.back-link:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.4);
}

.back-link:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* ============================================================
   语言切换（双语页面）
   ============================================================ */

.language-switcher {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-outline);
    padding: var(--space-3) var(--space-8);
    display: flex;
    justify-content: center;
    gap: var(--space-2);
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(8px);
}

.language-switcher a {
    color: var(--color-secondary);
    text-decoration: none;
    font-size: 0.88em;
    font-weight: 500;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-pill);
    transition: background var(--motion-fast) var(--ease-standard),
        color var(--motion-fast) var(--ease-standard);
}

.language-switcher a:hover {
    background: var(--color-secondary-container);
    color: var(--color-primary);
}

.language-switcher a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* ============================================================
   隐私政策正文
   ============================================================ */

.policy-content {
    padding: var(--space-10) var(--space-8);
}

.policy-content section {
    margin-bottom: var(--space-10);
}

.policy-content section:last-of-type {
    margin-bottom: 0;
}

.policy-content h2 {
    color: var(--color-primary);
    font-size: 1.4em;
    font-weight: 600;
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-3);
    border-bottom: 2px solid var(--color-outline);
    letter-spacing: -0.01em;
}

.policy-content h3 {
    color: var(--color-secondary);
    font-size: 1.1em;
    font-weight: 600;
    margin-top: var(--space-6);
    margin-bottom: var(--space-3);
}

.policy-content p {
    margin-bottom: var(--space-4);
    color: var(--color-on-surface);
    line-height: 1.75;
}

.policy-content ul,
.policy-content ol {
    margin-left: var(--space-6);
    margin-bottom: var(--space-4);
}

.policy-content li {
    margin-bottom: var(--space-2);
    color: var(--color-on-surface);
    line-height: 1.7;
}

.policy-content strong {
    color: var(--color-primary);
    font-weight: 600;
}

.policy-content a {
    color: var(--color-accent);
    text-decoration: none;
    word-break: break-all;
    transition: color var(--motion-fast) var(--ease-standard);
}

.policy-content a:hover {
    text-decoration: underline;
}

.policy-content a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

.policy-content code {
    background: var(--color-secondary-container);
    color: var(--color-secondary);
    padding: 2px var(--space-2);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.88em;
}

/* ============================================================
   高亮提示框
   ============================================================ */

.highlight-box {
    background: var(--color-secondary-container);
    border-left: 4px solid var(--color-accent);
    padding: var(--space-4) var(--space-5);
    margin: 0 0 var(--space-8);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.highlight-box p {
    margin-bottom: 0;
    color: var(--color-on-surface);
}

/* ============================================================
   表格
   ============================================================ */

.policy-content table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-4) 0 var(--space-6);
    font-size: 0.92em;
    background: var(--color-surface-container-lowest);
    border: 1px solid var(--color-outline);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.policy-content th,
.policy-content td {
    border-bottom: 1px solid var(--color-outline);
    padding: var(--space-3) var(--space-4);
    text-align: left;
    vertical-align: top;
}

.policy-content thead th {
    background: var(--color-primary);
    color: var(--color-on-primary);
    font-weight: 600;
    border-bottom: none;
}

.policy-content tbody tr:nth-child(even) {
    background: var(--color-surface-container-low);
}

.policy-content tbody tr:last-child td {
    border-bottom: none;
}

.policy-content td {
    color: var(--color-on-surface);
}

.policy-content td strong {
    color: var(--color-primary);
}

/* ============================================================
   联系信息块
   ============================================================ */

.policy-content .contact-info {
    background: var(--color-surface);
    border: 1px solid var(--color-outline);
    border-left: 4px solid var(--color-secondary);
    border-radius: var(--radius-md);
    padding: var(--space-5) var(--space-6);
    margin: var(--space-4) 0;
    font-size: 1em;
}

.policy-content .contact-info p {
    margin-bottom: var(--space-2);
    color: var(--color-on-surface);
}

.policy-content .contact-info p:last-child {
    margin-bottom: 0;
}

.policy-content .contact-info strong {
    display: inline-block;
    min-width: 100px;
    color: var(--color-primary);
}

/* ============================================================
   双语分隔与版本锚点
   ============================================================ */

.language-divider {
    margin: var(--space-12) 0 var(--space-10);
    text-align: center;
    border-top: 1px solid var(--color-outline);
    padding-top: var(--space-10);
    position: relative;
}

.language-divider::before {
    content: '';
    position: absolute;
    top: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--color-accent);
    border-radius: var(--radius-pill);
}

.language-divider .divider-label {
    display: inline-block;
    background: var(--color-surface-container-lowest);
    padding: 0 var(--space-4);
    color: var(--color-on-surface-variant);
    font-size: 0.85em;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

/* ============================================================
   Footer
   ============================================================ */

footer {
    background: var(--color-surface);
    padding: var(--space-8);
    text-align: center;
    border-top: 1px solid var(--color-outline);
}

footer p {
    color: var(--color-secondary);
    font-size: 0.88em;
    margin-bottom: var(--space-2);
}

footer p:last-child {
    margin-bottom: 0;
}

footer .contact-info {
    color: var(--color-on-surface-variant);
    font-size: 0.85em;
}

/* ============================================================
   响应式
   ============================================================ */

@media (max-width: 768px) {
    body {
        padding: var(--space-3);
    }

    header {
        padding: var(--space-10) var(--space-5);
    }

    header h1 {
        font-size: 1.9em;
    }

    main {
        padding: var(--space-6) var(--space-5);
    }

    .app-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }

    .app-card {
        padding: var(--space-6);
    }

    .policy-header {
        padding: var(--space-8) var(--space-5);
    }

    .policy-header h1 {
        font-size: 1.6em;
    }

    .language-switcher {
        padding: var(--space-2) var(--space-4);
    }

    .policy-content {
        padding: var(--space-6) var(--space-5);
    }

    .policy-content h2 {
        font-size: 1.2em;
    }

    .policy-content h3 {
        font-size: 1.02em;
    }

    .policy-content table {
        font-size: 0.82em;
    }

    .policy-content th,
    .policy-content td {
        padding: var(--space-2) var(--space-3);
    }

    .policy-content .contact-info strong {
        min-width: 84px;
    }

    footer {
        padding: var(--space-5);
    }
}

@media (max-width: 375px) {
    header h1 {
        font-size: 1.6em;
    }

    .policy-content {
        padding: var(--space-5) var(--space-4);
    }

    .policy-content table {
        font-size: 0.78em;
    }
}

/* ============================================================
   打印
   ============================================================ */

@media print {
    body {
        background: white;
        padding: 0;
    }

    .container {
        box-shadow: none;
        border: none;
        max-width: 100%;
    }

    header,
    .policy-header {
        background: white;
        color: var(--color-primary);
        padding: var(--space-4) 0;
    }

    header h1,
    .policy-header h1 {
        color: var(--color-primary);
    }

    .language-switcher,
    .back-link {
        display: none;
    }

    .policy-content thead th {
        background: #eee;
        color: var(--color-primary);
    }

    .policy-content tbody tr:nth-child(even) {
        background: transparent;
    }

    .highlight-box,
    .policy-content .contact-info {
        background: transparent;
        border-color: #999;
    }

    footer {
        border-top: 1px solid #999;
    }
}

/* ============================================================
   选中文本 / Reduced motion
   ============================================================ */

::selection {
    background: var(--color-accent);
    color: #FFFFFF;
}

::-moz-selection {
    background: var(--color-accent);
    color: #FFFFFF;
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}