/* ============================================================
 * 公共全局样式 common.css
 * 适用：index首页 + qa问答页面 两个HTML共同引入
 * 注意：页面独有组件不要写在此文件，写在页面专属css
 ============================================================ */

/* --------------------------
1. Fluent Design CSS变量（两套页面完全一致）
---------------------------*/
:root {
    --fluent-primary: #0078D4;
    --fluent-primary-hover: #106EBE;
    --fluent-primary-pressed: #005A9E;
    --neutral-0: #FFFFFF;
    --neutral-10: #F3F3F3;
    --neutral-20: #EBEBEB;
    --neutral-30: #DCDCDC;
    --neutral-40: #C8C8C8;
    --neutral-100: #949494;
    --neutral-200: #6E6E6E;
    --neutral-300: #424242;
    --neutral-400: #242424;
    --text-primary: var(--neutral-400);
    --text-secondary: var(--neutral-200);
    --text-disabled: var(--neutral-100);

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.04), 0 2px 6px rgba(0, 0, 0, 0.03);
    --shadow-flyout: 0 4px 16px rgba(0, 0, 0, 0.08), 0 1px 4px rgba(0, 0, 0, 0.04);
    --shadow-float: 0 8px 32px rgba(0, 0, 0, 0.10), 0 2px 8px rgba(0, 0, 0, 0.04);

    --fluent-ease: cubic-bezier(0, 0, 0.2, 1);
    --transition-fast: 150ms var(--fluent-ease);
    --transition-normal: 200ms var(--fluent-ease);
    --transition-slow: 300ms var(--fluent-ease);

    --glass-bg: rgba(255, 255, 255, 0.50);
    --glass-bg-heavy: rgba(255, 255, 255, 0.72);
    --glass-border: rgba(0, 0, 0, 0.06);
    --blur-base: 16px;
    --page-bg: #e8edf5;
}

/* 深色模式系统自动适配 */
@media (prefers-color-scheme: dark) {
    :root {
        --fluent-primary: #4A9EFF;
        --fluent-primary-hover: #6BB3FF;
        --fluent-primary-pressed: #2A7FD4;
        --neutral-0: #1F1F1F;
        --neutral-10: #2D2D2D;
        --neutral-20: #383838;
        --neutral-30: #444444;
        --neutral-100: #8A8A8A;
        --neutral-200: #ADADAD;
        --neutral-300: #D0D0D0;
        --neutral-400: #FFFFFF;

        --glass-bg: rgba(40, 40, 40, 0.55);
        --glass-bg-heavy: rgba(30, 30, 30, 0.78);
        --glass-border: rgba(255, 255, 255, 0.06);
        --page-bg: #121212;

        --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.3);
        --shadow-flyout: 0 4px 16px rgba(0, 0, 0, 0.4);
        --shadow-float: 0 8px 32px rgba(0, 0, 0, 0.5);
    }
}

/* --------------------------
2. 全局基础重置样式（两份页面完全共用）
---------------------------*/
* {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    margin: 0;
    padding: 0;
    min-height: 100%;
    scroll-behavior: smooth;
    background: var(--page-bg);
    overflow-x: hidden;
}

body {
    position: relative;
    isolation: isolate;
    min-height: 100vh;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-primary);
    background-color: var(--page-bg);
    background-image: url("./img/bg.jpg");
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    background-attachment: fixed;
    overflow-x: hidden;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background: linear-gradient(180deg, rgba(245, 248, 255, 0.10) 0%, rgba(21, 30, 48, 0.05) 100%);
}

body>* {
    position: relative;
    z-index: 1;
}

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

button,
input,
select,
textarea {
    font: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    outline: none;
}

/* --------------------------
3. Iconify图标公共样式（两页面共用）
---------------------------*/
.icon-svg {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.2em;
    height: 1.2em;
    vertical-align: middle;
    flex-shrink: 0;
    color: inherit;
    font-size: 1.2em;
}
.icon-sm {
    width: 1em;
    height: 1em;
    font-size: 1em;
}
.icon-lg {
    width: 1.5em;
    height: 1.5em;
    font-size: 1.5em;
}
.icon-xl {
    width: 2.4em;
    height: 2.4em;
    font-size: 2.4em;
}

/* --------------------------
4. 滚动条公共样式
---------------------------*/
::-webkit-scrollbar {
    width: 5px;
    height: 5px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--neutral-30);
    border-radius: 999px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--neutral-40);
}

/* --------------------------
5. 顶部导航 top‑nav 公共组件（两份页面导航结构一致）
---------------------------*/
.top-nav {
    position: sticky;
    top: 12px;
    z-index: 40;
    width: min(1180px, calc(100% - 28px));
    min-height: 50px;
    margin: 12px auto 0;
    padding: 6px 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-base)) saturate(130%);
    -webkit-backdrop-filter: blur(var(--blur-base));
    box-shadow: var(--shadow-card);
    transition: background var(--transition-normal), box-shadow var(--transition-normal);
    flex-wrap: wrap;
}
.top-nav.scrolled {
    background: var(--glass-bg-heavy);
    box-shadow: var(--shadow-flyout);
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1 1 auto;
}
.nav-right {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
    justify-content: flex-end;
    position: relative;
}

.nav-brand {
    min-width: 0;
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
}
.nav-brand .full-name {
    display: inline;
}
.nav-brand .short-name {
    display: none;
}

.nav-btn {
    padding: 6px 14px;
    border-radius: var(--radius-md);
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-primary);
    background: transparent;
    border: 1px solid transparent;
    transition: all var(--transition-fast);
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.nav-btn:hover {
    background: var(--neutral-10);
    border-color: var(--glass-border);
}
.nav-btn:active {
    background: var(--neutral-20);
}

.nav-btn-rounded {
    border-radius: 999px !important;
    background: rgba(0, 120, 212, 0.08);
    border-color: rgba(0, 120, 212, 0.2);
    color: var(--fluent-primary-pressed);
    padding: 6px 18px;
}
.nav-btn-rounded:hover {
    background: rgba(0, 120, 212, 0.15);
    border-color: var(--fluent-primary);
}
.nav-btn-rounded:active {
    background: rgba(0, 120, 212, 0.25);
}

/* --------------------------
6. Modal弹窗公共组件，两个页面弹窗完全复用
---------------------------*/
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: rgba(0, 0, 0, 0.30);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}
.modal-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

.modal-card {
    width: 100%;
    max-width: 720px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    padding: 22px 24px 24px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    background: var(--glass-bg-heavy);
    backdrop-filter: blur(var(--blur-base)) saturate(130%);
    -webkit-backdrop-filter: blur(var(--blur-base));
    box-shadow: var(--shadow-float);
    transform: scale(.97) translateY(8px);
    opacity: 0;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
}
.modal-overlay.open .modal-card {
    transform: scale(1) translateY(0);
    opacity: 1;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--neutral-20);
    flex-shrink: 0;
}
.modal-header h3 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.05rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}
.modal-close {
    padding: 5px 8px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
    font-size: 1rem;
    transition: background var(--transition-fast);
}
.modal-close:hover {
    background: var(--neutral-10);
}
.modal-body {
    flex: 1;
    overflow-y: auto;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}
.modal-body .highlight {
    color: var(--fluent-primary-pressed);
    font-weight: 600;
}

/* --------------------------
7. 公共工具类动画、工具class
---------------------------*/
.fade-in {
    animation: fadeIn 400ms var(--fluent-ease) forwards;
}
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.flex { display: flex; }
.items-center { align-items: center; }
.gap-2 { gap: 8px; }
.text-sm { font-size: 0.85rem; }
.text-soft { color: var(--text-secondary); }
.mb-4 { margin-bottom: 16px; }
.mt-2 { margin-top: 8px; }

.tag {
    display: inline-block;
    padding: 2px 12px;
    border-radius: 999px;
    background: rgba(0, 120, 212, 0.06);
    color: var(--fluent-primary-pressed);
    font-size: 0.7rem;
    font-weight: 500;
    border: 1px solid rgba(0, 120, 212, 0.08);
}

/* --------------------------
8. 减少透明度偏好适配（无障碍，禁用毛玻璃）
---------------------------*/
@media (prefers-reduced-transparency: reduce) {
    .top-nav,
    .modal-card {
        backdrop-filter: none !important;
        -webkit-backdrop-filter: none !important;
        background: var(--neutral-0) !important;
    }
}