/* ========================================
   灵译隐私政策 - 样式文件
   Apple-inspired design with frosted glass
   ======================================== */

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

:root {
    /* 色彩系统 */
    --color-bg: #f5f5f7;
    --color-bg-elevated: rgba(255, 255, 255, 0.72);
    --color-bg-glass: rgba(255, 255, 255, 0.56);
    --color-text-primary: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-text-tertiary: #86868b;
    --color-accent: #0071e3;
    --color-accent-hover: #0077ed;
    --color-border: rgba(0, 0, 0, 0.08);
    --color-border-strong: rgba(0, 0, 0, 0.14);

    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
        "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas, monospace;

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;

    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08);

    /* 毛玻璃 */
    --blur-sm: blur(12px);
    --blur-md: blur(20px);
    --blur-lg: blur(40px);

    /* 间距 */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 40px;
    --space-2xl: 64px;
    --space-3xl: 96px;

    /* 过渡 */
    --transition-fast: 120ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 280ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* 深色模式 */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #000000;
        --color-bg-elevated: rgba(28, 28, 30, 0.8);
        --color-bg-glass: rgba(44, 44, 46, 0.6);
        --color-text-primary: #f5f5f7;
        --color-text-secondary: #a1a1a6;
        --color-text-tertiary: #86868b;
        --color-accent: #2997ff;
        --color-accent-hover: #4da3ff;
        --color-border: rgba(255, 255, 255, 0.1);
        --color-border-strong: rgba(255, 255, 255, 0.18);
    }
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text-primary);
    background: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* 背景模糊装饰 */
.background-blur {
    position: fixed;
    top: -20%;
    right: -10%;
    width: 60vw;
    height: 60vw;
    border-radius: 50%;
    background: radial-gradient(
        circle,
        rgba(0, 113, 227, 0.08) 0%,
        rgba(0, 113, 227, 0) 70%
    );
    filter: var(--blur-lg);
    pointer-events: none;
    z-index: -1;
}

@media (prefers-color-scheme: dark) {
    .background-blur {
        background: radial-gradient(
            circle,
            rgba(41, 151, 255, 0.12) 0%,
            rgba(41, 151, 255, 0) 70%
        );
    }
}

/* ---------- Header ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-bg-glass);
    backdrop-filter: var(--blur-md);
    -webkit-backdrop-filter: var(--blur-md);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    max-width: 820px;
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.brand-icon {
    font-size: 1.4rem;
}

.brand-name {
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.brand-sub {
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
    font-weight: 400;
}

.lang-switcher {
    display: flex;
    gap: var(--space-xs);
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    padding: 3px;
}

.lang-btn {
    background: transparent;
    border: none;
    padding: var(--space-sm) var(--space-md);
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

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

.lang-btn.active {
    background: var(--color-bg-elevated);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-sm);
}

/* ---------- Main Content ---------- */
.main-content {
    max-width: 820px;
    margin: 0 auto;
    padding: var(--space-3xl) var(--space-lg) var(--space-3xl);
}

.policy-content {
    animation: fadeIn var(--transition-smooth) ease-out;
}

.policy-content.hidden {
    display: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ---------- Hero ---------- */
.hero {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.hero h1 {
    font-size: 2.8rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    line-height: 1.1;
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.last-updated {
    font-size: 0.95rem;
    color: var(--color-text-tertiary);
}

/* ---------- Sections ---------- */
.section {
    margin-bottom: var(--space-2xl);
}

.section h2 {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.015em;
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
}

.section h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-top: var(--space-xl);
    margin-bottom: var(--space-md);
    color: var(--color-text-primary);
}

.section p {
    margin-bottom: var(--space-md);
    color: var(--color-text-secondary);
    line-height: 1.75;
}

.section strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

/* ---------- Lists ---------- */
.section ul,
.section ol {
    padding-left: var(--space-lg);
    margin-bottom: var(--space-md);
}

.section li {
    margin-bottom: var(--space-sm);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.section li strong {
    color: var(--color-text-primary);
}

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

.check-list .cross {
    padding-left: var(--space-md);
    position: relative;
}

.tag-list {
    list-style: none;
    padding-left: 0;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.tag-list li {
    background: var(--color-bg-glass);
    backdrop-filter: var(--blur-sm);
    border: 1px solid var(--color-border);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

/* ---------- Table ---------- */
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--space-md);
    font-size: 0.9rem;
    background: var(--color-bg-elevated);
    backdrop-filter: var(--blur-sm);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

thead {
    background: var(--color-bg-glass);
}

th {
    text-align: left;
    padding: var(--space-md);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-bottom: 1px solid var(--color-border-strong);
}

td {
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    vertical-align: top;
}

tr:last-child td {
    border-bottom: none;
}

/* ---------- Code ---------- */
code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: var(--color-bg-glass);
    border: 1px solid var(--color-border);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--color-accent);
}

/* ---------- Links ---------- */
a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

/* ---------- Footer ---------- */
.policy-footer {
    margin-top: var(--space-3xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text-tertiary);
    font-size: 0.95rem;
}

.policy-footer .tagline {
    margin-top: var(--space-sm);
    font-size: 0.85rem;
    font-style: italic;
    opacity: 0.7;
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
    .hero h1 {
        font-size: 2rem;
    }

    .section h2 {
        font-size: 1.25rem;
    }

    .header-inner {
        padding: var(--space-sm) var(--space-md);
    }

    .main-content {
        padding: var(--space-xl) var(--space-md);
    }

    table {
        font-size: 0.82rem;
    }

    th,
    td {
        padding: var(--space-sm);
    }
}