/* ============================================================
   SUMI 下载站 · 样式表（纯 CSS，无 JS · 纯白极简）
   ============================================================ */

:root {
    --bg: #ffffff;
    --text: #111111;
    --text-soft: #3d3d3d;
    --muted: #8a8f98;
    --line: #e8e8e8;
    --btn: #111111;
    --btn-hover: #333333;

    /* 字体 */
    --font-sans: "Segoe UI", system-ui, -apple-system, "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    --font-mono: ui-monospace, "Cascadia Code", "JetBrains Mono", Consolas,
        "SF Mono", Menlo, monospace;

    /* 布局 */
    --page-max: 1040px;
    --header-h: 60px;

    color-scheme: light;
}

/* ---------- 基础 ---------- */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.65;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

::selection {
    background: var(--text);
    color: #fff;
}

:focus-visible {
    outline: 2px solid var(--text);
    outline-offset: 3px;
    border-radius: 2px;
}

/* ---------- 顶部导航 ---------- */

.site-header {
    position: sticky;
    top: 0;
    z-index: 40;
    background: rgba(255, 255, 255, 0.94);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--line);
}

.header-inner {
    max-width: var(--page-max);
    margin-inline: auto;
    height: var(--header-h);
    padding-inline: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

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

/* Logo：纯色小方块 */
.chip-logo {
    width: 22px;
    height: 22px;
    border-radius: 6px;
    background: var(--text);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3px;
    padding: 5px;
}
.chip-logo i {
    background: #fff;
    border-radius: 1px;
}

.brand-name {
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 0.04em;
}
.brand-name em {
    font-style: normal;
    font-weight: 400;
    color: var(--muted);
    margin-left: 2px;
}

.nav {
    display: flex;
    align-items: center;
    gap: 4px;
}
.nav a {
    padding: 7px 12px;
    border-radius: 999px;
    font-size: 13.5px;
    color: #5c5c5c;
    transition: color 0.15s, background-color 0.15s;
}
.nav a:hover {
    color: var(--text);
    background: #f4f4f4;
}
.nav-cta {
    margin-left: 8px;
    color: #fff !important;
    background: var(--btn) !important;
}
.nav-cta:hover {
    background: var(--btn-hover) !important;
}
.nav-cta span {
    font-size: 12px;
    vertical-align: 1px;
}

/* ---------- Hero ---------- */

.hero {
    max-width: var(--page-max);
    margin-inline: auto;
    padding: 84px 24px 64px;
}

.hero-kicker {
    display: block;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: #9aa0a8;
    margin-bottom: 18px;
}

.hero-title {
    font-size: clamp(1.9rem, 4.6vw, 3rem);
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: 0.005em;
}

/* 第二行淡灰，形成层次 */
.grad-text {
    color: #b3b8c0;
}

.hero-sub {
    margin-top: 18px;
    color: var(--muted);
    font-size: 15px;
}

/* 统计 */
.hero-stats {
    margin-top: 40px;
    display: flex;
    flex-wrap: wrap;
}
.stat {
    padding-right: 44px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.stat + .stat {
    border-left: 1px solid var(--line);
    padding-left: 44px;
}
.stat strong {
    font-size: 20px;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.01em;
}
.stat span {
    font-size: 12px;
    color: #9aa0a8;
}

/* ---------- 目录 ---------- */

.catalog {
    max-width: var(--page-max);
    margin-inline: auto;
    padding: 16px 24px 32px;
    display: flex;
    flex-direction: column;
    gap: 64px;
}

.group {
    scroll-margin-top: calc(var(--header-h) + 20px);
}

.group-head {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    margin-bottom: 22px;
}
.group-no {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 600;
    color: #b0b4ba;
    padding-top: 5px;
}
.group-head h2 {
    font-size: 17px;
    font-weight: 700;
    letter-spacing: 0.01em;
}
.group-head p {
    margin-top: 4px;
    font-size: 13px;
    color: #9aa0a8;
}

/* 卡片网格 */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
}

/* ---------- 卡片 ---------- */

.card {
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 22px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 12px;
    transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.card:hover {
    border-color: var(--text);
    box-shadow: 0 4px 14px rgba(17, 17, 17, 0.06);
}

.card-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 16px;
}

.card-no {
    font-family: var(--font-mono);
    font-size: 22px;
    font-weight: 700;
    line-height: 1;
    color: #e4e6ea;
    transition: color 0.18s ease;
}
.card:hover .card-no {
    color: var(--text);
}

/* 应用图标：纯色小方块 */
.app-icon {
    width: 48px;
    height: 48px;
    border-radius: 11px;
    display: grid;
    place-items: center;
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: #fff;
}

.icon-exe {
    background: #2563eb;
}
.icon-exe-mx {
    background: #0d9488;
}
.icon-dmg {
    background: #6b7280;
}
.icon-zip {
    background: #16a34a;
}
.icon-7z {
    background: #ea580c;
}

/* 标题与描述 */
.card-title {
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 600;
    line-height: 1.55;
    color: var(--text-soft);
    word-break: break-all;
    margin-bottom: 6px;
}

.card-desc {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 14px;
}

.card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 18px;
}

.badge {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.02em;
    padding: 2px 9px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: #fafafa;
    color: #666;
    white-space: nowrap;
}

.meta-size {
    font-family: var(--font-mono);
    font-size: 12px;
    color: #9aa0a8;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

/* 下载按钮：纯色 */
.download {
    margin-top: auto;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 16px;
    border-radius: 10px;
    font-size: 13.5px;
    font-weight: 600;
    letter-spacing: 0.02em;
    color: #fff;
    background: var(--btn);
    transition: background 0.15s ease;
}
.download:hover {
    background: var(--btn-hover);
}
.dl-arrow {
    font-size: 14px;
    line-height: 1;
    transition: transform 0.15s ease;
}
.download:hover .dl-arrow {
    transform: translateY(2px);
}

/* ---------- 页脚 ---------- */

.site-footer {
    margin-top: 40px;
    border-top: 1px solid var(--line);
    padding: 44px 24px 40px;
    text-align: center;
    color: var(--muted);
    font-size: 13px;
}
.footer-brand {
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: var(--text);
    margin-bottom: 8px;
}
.site-footer a {
    color: var(--text);
    border-bottom: 1px solid #c9c9c9;
    transition: border-color 0.15s;
}
.site-footer a:hover {
    border-bottom-color: var(--text);
}
.footer-copy {
    margin-top: 14px;
    font-size: 12px;
    color: #b0b4ba;
}

/* ---------- 响应式 ---------- */

@media (max-width: 720px) {
    .hero {
        padding: 56px 20px 44px;
    }
    .hero-sub br {
        display: none;
    }
    .stat {
        padding-right: 24px;
    }
    .stat + .stat {
        padding-left: 24px;
    }
    .catalog {
        padding: 12px 20px 24px;
        gap: 48px;
    }
    .cards {
        grid-template-columns: 1fr;
    }
    .nav a:not(.nav-cta) {
        display: none;
    }
}

/* ---------- 动效偏好 ---------- */

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    *,
    *::before,
    *::after {
        transition: none !important;
        animation: none !important;
    }
}