/* ============================================
   霖屿工作室 · 极简美学（DeepSeek 式设计语言）
   -------------------------------------------------
   纯白底 / 大幅标题 / 浅灰次表面 / 深蓝强调 / 扁平克制
   ============================================ */

:root {
    /* 配色 */
    --bg:        #ffffff;
    --bg-soft:   #f7f7f8;   /* 次级表面 */
    --code-bg:   #010405;   /* 深色代码面 */
    --ink:       #010405;   /* 主文字（近黑） */
    --ink-2:     #1f2328;
    --muted:     #565d66;
    --muted-2:   #8a929c;
    --accent:    #4d6bfe;   /* DeepSeek 蓝 */
    --line:      #e6e8eb;

    /* 圆角 / 阴影（克制） */
    --r-sm: 10px;
    --r-md: 14px;
    --r-lg: 18px;
    --shadow-hover: 0 12px 40px rgba(1, 4, 5, .10);

    --font: "Inter", -apple-system, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Segoe UI", sans-serif;
    --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "Courier New", monospace;
    --ease: cubic-bezier(.22, .61, .36, 1);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    color: var(--ink);
    background: var(--bg);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 28px; }

/* 通用过渡 */
a, button, .btn, .filter-btn, .project-card, .badge, .announcement-item {
    transition: all .22s var(--ease);
}

/* ============================================
   头部（纯白极简）
   ============================================ */
.site-header {
    background: rgba(255, 255, 255, .86);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
    position: sticky;
    top: 0;
    z-index: 60;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 66px;
}

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

.logo-mark {
    width: 30px; height: 30px;
    display: inline-flex; align-items: center; justify-content: center;
    background: var(--ink);
    color: #fff;
    font-weight: 700;
    font-size: 15px;
    letter-spacing: .5px;
    border-radius: 8px;
}

.logo-text { font-weight: 700; font-size: 18px; color: var(--ink); letter-spacing: .2px; }

.main-nav { display: flex; align-items: center; gap: 30px; }

.main-nav a {
    color: var(--muted);
    font-size: 14px;
    font-weight: 500;
    position: relative;
}

.main-nav a:hover,
.main-nav a.active { color: var(--ink); }

/* 首页导航底部细点 */
.main-nav a.nav-line::after {
    content: "";
    position: absolute;
    left: 50%; bottom: -8px;
    width: 4px; height: 4px;
    border-radius: 50%;
    background: var(--accent);
    transform: translateX(-50%) scale(0);
    transition: transform .22s var(--ease);
}
.main-nav a.nav-line.active::after { transform: translateX(-50%) scale(1); }

.main-nav a.nav-admin {
    padding: 7px 16px;
    border: 1px solid var(--line);
    border-radius: 999px;
    font-size: 13px;
}

.main-nav a.nav-admin:hover {
    border-color: var(--ink);
    color: var(--ink);
}

/* ============================================
   Hero（浅底 · qulin 式粗体大字重标题 + 淡蓝光晕网格）
   ============================================ */
.hero {
    background: #f7f8ff;
    color: var(--ink);
    padding: 130px 0 120px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* 淡蓝 / 青径向光晕 */
.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(640px 640px at 18% 16%, rgba(77, 107, 254, .10), transparent 60%),
        radial-gradient(560px 560px at 84% 26%, rgba(6, 182, 212, .07), transparent 60%),
        radial-gradient(560px 560px at 50% 96%, rgba(77, 107, 254, .06), transparent 60%);
}

/* 微弱网格线 */
.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(15, 23, 42, .035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(15, 23, 42, .035) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-inner { position: relative; z-index: 1; max-width: 860px; margin: 0 auto; }

/* 鼠标追踪光斑（跟随光标的光晕） */
.hero-spotlight {
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    opacity: 0;
    transition: opacity .35s var(--ease);
    background: radial-gradient(460px circle at var(--mx, 50%) var(--my, 40%), rgba(77, 107, 254, .16), rgba(6, 182, 212, .10) 38%, transparent 62%);
}
.hero.is-hover .hero-spotlight { opacity: 1; }

/* 主标题：qulin 式超粗 · 大字重 · 字距收紧 · 自适应 */
.hero h1 {
    margin-top: 24px;
    font-size: clamp(2.6rem, 7vw, 5rem);
    font-weight: 800;
    letter-spacing: -1.5px;
    line-height: 1.05;
    color: var(--ink);
}

.hero-slogan {
    max-width: 100%;
    margin: 26px auto 0;
    font-size: 15px;
    color: var(--muted);
}

/* 渐变强调语：静态渐变 + 单行 + 自适应 */
.gradient-text {
    background: linear-gradient(100deg, #4d6bfe 0%, #7c5cff 30%, #ec6a5c 60%, #f6a94d 90%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    font-size: clamp(1rem, 3.2vw, 1.9rem);
    font-weight: 800;
    letter-spacing: .5px;
    line-height: 1.3;
    white-space: nowrap;
}

.hero .btn { margin-top: 46px; display: inline-block; }

/* ============================================
   按钮（扁平 · 深色主按钮）
   ============================================ */
.btn {
    display: inline-block;
    padding: 11px 26px;
    border: 1px solid var(--line);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    background: var(--bg);
    color: var(--ink);
    cursor: pointer;
    text-align: center;
    box-shadow: none;
}

.btn:hover { border-color: var(--ink); }

/* 深色主按钮 */
.btn-primary {
    background: var(--ink);
    border: 1px solid var(--ink);
    color: #fff;
}

.btn-primary:hover { background: #2a2e33; border-color: #2a2e33; }

/* 浅色（浅底 Hero 用的描边按钮） */
.btn-light {
    background: transparent;
    border: 1px solid rgba(1, 4, 5, .25);
    color: var(--ink);
    font-weight: 600;
}

.btn-light:hover { background: var(--ink); border-color: var(--ink); color: #fff; }

/* 蓝色强调 */
.btn-link {
    color: var(--accent);
    border-color: transparent;
    padding: 10px 12px;
}

.btn-link:hover { color: #3b58e8; }

.btn-danger {
    border-color: #ffe0e0;
    color: #d64545;
    background: var(--bg);
}

.btn-danger:hover { background: #d64545; border-color: #d64545; color: #fff; }

.btn-block { width: 100%; }

.btn-sm { padding: 5px 14px; font-size: 13px; border-radius: 7px; }

/* ============================================
   通用区块标题（眉题 + 大标题）
   ============================================ */
.section-header { margin-bottom: 40px; }

.section-header .kicker {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--accent);
}

.section-header h2 {
    margin-top: 12px;
    font-size: 38px;
    font-weight: 700;
    letter-spacing: .2px;
    line-height: 1.15;
}

.section-header .lead {
    margin-top: 12px;
    color: var(--muted);
    max-width: 560px;
    font-size: 15px;
}

/* ============================================
   公告系统
   ============================================ */
.announcements-section { padding: 40px 0 8px; }

.announcements-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    border-radius: var(--r-lg);
    background: var(--bg-soft);
    padding: 8px 8px;
}

.announcement-item {
    display: flex;
    gap: 18px;
    align-items: flex-start;
    background: var(--bg);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    padding: 20px 24px;
}

.announcement-item:hover { border-color: var(--ink); }

.announcement-item.is-pinned:hover { border-color: var(--accent); }

.pin-dot {
    flex-shrink: 0;
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--accent);
    margin-top: 11px;
}

.announcement-main { flex: 1; min-width: 0; }

.announcement-item-title { font-size: 16px; font-weight: 600; color: var(--ink); }

.announcement-content {
    margin-top: 5px;
    color: var(--muted);
    font-size: 14px;
    white-space: pre-wrap;
    word-break: break-word;
}

.announcement-time {
    flex-shrink: 0;
    color: var(--muted-2);
    font-size: 13px;
    font-variant-numeric: tabular-nums;
    padding: 3px 0;
    font-family: var(--font-mono);
}

/* ============================================
   项目区块
   ============================================ */
.projects-section { padding: 72px 0 40px; }

/* 分类筛选 */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 40px;
}

.filter-btn {
    padding: 8px 20px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--bg);
    color: var(--muted);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
}

.filter-btn:hover { border-color: var(--ink); color: var(--ink); }

.filter-btn.active { background: var(--ink); border-color: var(--ink); color: #fff; }

/* 项目卡片（浅灰块 · 细边框） */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 22px;
}

.project-card {
    background: var(--bg-soft);
    border: 1px solid transparent;
    border-radius: var(--r-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-4px);
    background: var(--bg);
    border-color: var(--line);
    box-shadow: var(--shadow-hover);
}

.card-cover {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
}

.card-cover img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform .6s var(--ease);
}

.project-card:hover .card-cover img { transform: scale(1.05); }

.card-cover-gradient {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(150deg, #1f2328, #3b58e8, #4d6bfe);
    color: #fff;
}

.cover-title {
    font-size: 26px;
    font-weight: 700;
    padding: 0 20px;
    text-align: center;
    letter-spacing: 2px;
}

.card-body { padding: 22px 26px 26px; display: flex; flex-direction: column; flex: 1; }

.card-category {
    align-self: flex-start;
    font-size: 12px;
    font-weight: 600;
    color: var(--accent);
    background: rgba(77, 107, 254, .10);
    padding: 3px 12px;
    border-radius: 999px;
    margin-bottom: 14px;
}

.card-title { font-size: 19px; font-weight: 700; letter-spacing: .2px; }

.card-desc {
    color: var(--muted);
    font-size: 14px;
    margin-top: 8px;
    flex: 1;
}

.card-actions { margin-top: 20px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }

.card-actions .btn-arrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--accent);
}

.card-actions .btn-arrow svg { transition: transform .22s var(--ease); }

.project-card:hover .card-actions .btn-arrow svg { transform: translateX(4px); }

/* ============================================
   底部
   ============================================ */
.site-footer {
    margin-top: 90px;
    border-top: 1px solid var(--line);
    background: var(--bg-soft);
    padding: 34px 0;
    text-align: center;
    color: var(--muted);
    font-size: 13px;
}

.site-footer p + p { margin-top: 8px; }

.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--ink); }

.footer-sep { margin: 0 10px; color: var(--line); }

.beian-link { display: inline-flex; align-items: center; gap: 6px; }
.beian-icon { flex-shrink: 0; vertical-align: middle; }

/* ============================================
   空状态 / 提示条
   ============================================ */
.empty-state {
    text-align: center;
    padding: 90px 20px;
    color: var(--muted);
}

.alert {
    padding: 13px 18px;
    border-radius: 10px;
    margin-bottom: 22px;
    font-size: 14px;
    line-height: 1.6;
}

.alert-success { background: #edf8f0; color: #1b7f4d; border: 1px solid #bfe8cf; }
.alert-danger { background: #fdf1f1; color: #d64545; border: 1px solid #f6cfcf; }
.alert-success p, .alert-danger p { margin: 0; }

/* ============================================
   登录页（柔和浅底）
   ============================================ */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-soft);
    padding: 24px;
}

.login-box {
    width: 100%;
    max-width: 400px;
    background: var(--bg);
    border: 1px solid var(--line);
    border-radius: var(--r-lg);
    padding: 40px 36px 32px;
    animation: fadeUp .5s var(--ease);
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.login-head { text-align: center; margin-bottom: 28px; }

.login-head .logo-mark {
    width: 40px; height: 40px;
    font-size: 18px;
    border-radius: 10px;
    margin: 0 auto 16px;
    display: flex;
}

.login-head h1 { font-size: 19px; font-weight: 700; letter-spacing: .3px; }

.login-sub {
    margin-top: 8px;
    font-size: 12px;
    color: var(--muted);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.login-back { margin-top: 20px; text-align: center; font-size: 13px; color: var(--muted); }
.login-back a:hover { color: var(--ink); }

/* ============================================
   后台
   ============================================ */
.admin-header {
    background: var(--ink);
    border-bottom: none;
}

.admin-header .logo-text { color: #f4f5f6; }

.admin-header .main-nav a { color: #9aa1a9; }
.admin-header .main-nav a:hover,
.admin-header .main-nav a.active { color: #fff; }

.admin-main { padding: 40px 0 60px; }

.admin-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.admin-toolbar h2 { font-size: 24px; font-weight: 700; letter-spacing: .2px; }

/* 表格 */
.admin-table-wrap {
    background: var(--bg);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    overflow: hidden;
}

.admin-table { width: 100%; border-collapse: collapse; min-width: 760px; }

.admin-table th,
.admin-table td {
    padding: 14px 18px;
    text-align: left;
    font-size: 14px;
    border-bottom: 1px solid var(--line);
    vertical-align: middle;
}

.admin-table thead th {
    background: var(--bg-soft);
    font-weight: 600;
    color: var(--muted);
    font-size: 13px;
    letter-spacing: .2px;
}

.admin-table tbody tr:last-child td { border-bottom: none; }

.admin-table tbody tr:hover { background: var(--bg-soft); }

.th-actions { width: 150px; }

.td-title { font-weight: 600; }

.table-thumb {
    width: 74px; height: 46px;
    object-fit: cover;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-soft);
}

.table-thumb-empty {
    font-size: 12px;
    color: var(--muted);
    border: 1px dashed var(--line);
}

.td-actions { white-space: nowrap; }
.td-actions .btn + .btn { margin-left: 8px; }

/* 徽标 */
.badge {
    display: inline-block;
    font-size: 12px;
    font-weight: 500;
    padding: 3px 12px;
    border-radius: 999px;
}

.badge-on { background: #edf8f0; color: #1b7f4d; }
.badge-off { background: var(--bg-soft); color: var(--muted-2); }
.badge:hover { opacity: .8; }

/* 表单 */
.admin-form {
    background: var(--bg);
    border: 1px solid var(--line);
    border-radius: var(--r-lg);
    padding: 32px 36px;
    max-width: 740px;
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

.form-group { margin-bottom: 22px; }

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 9px;
    letter-spacing: .1px;
}

.form-group label em { color: #d64545; font-style: normal; }

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="password"],
.form-group textarea {
    width: 100%;
    padding: 11px 15px;
    border: 1px solid var(--line);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    background: var(--bg);
    transition: border-color .2s, box-shadow .2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(77, 107, 254, .12);
}

.form-group textarea { resize: vertical; }

.form-group input[type="file"] { font-size: 13px; }

.form-hint { font-size: 12px; color: var(--muted); margin-top: 7px; }

.form-checkbox { display: flex; align-items: center; min-height: 44px; }

.form-checkbox label {
    display: flex;
    align-items: center;
    gap: 9px;
    font-weight: 500;
    margin: 0;
    cursor: pointer;
}

.form-checkbox input { width: 17px; height: 17px; accent-color: var(--accent); }

.form-actions { display: flex; gap: 14px; margin-top: 8px; }

.image-preview { margin-bottom: 14px; }

.image-preview img {
    width: 230px;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border-radius: 10px;
    border: 1px solid var(--line);
}

.admin-footer {
    border-top: 1px solid var(--line);
    padding: 22px 0;
    text-align: center;
    color: var(--muted);
    font-size: 13px;
    background: var(--bg-soft);
}

/* ============================================
   项目简介弹窗（Modal）
   ============================================ */
.no-scroll { overflow: hidden; }

.modal {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    visibility: hidden;
    transition: opacity .25s var(--ease), visibility .25s var(--ease);
}
.modal.open { opacity: 1; visibility: visible; }

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(8, 8, 14, .55);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.modal-card {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 520px;
    max-height: 82vh;
    overflow-y: auto;
    background: var(--bg);
    border: 1px solid var(--line);
    border-radius: var(--r-lg);
    padding: 30px 32px;
    box-shadow: var(--shadow-hover);
    transform: translateY(16px) scale(.98);
    transition: transform .28s var(--ease);
}
.modal.open .modal-card { transform: none; }

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 32px; height: 32px;
    border: none;
    background: var(--bg-soft);
    color: var(--muted);
    border-radius: 50%;
    font-size: 20px;
    line-height: 1;
    cursor: pointer;
}
.modal-close:hover { background: var(--ink); color: #fff; }

.modal-category {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: var(--accent);
    background: rgba(77, 107, 254, .10);
    padding: 3px 12px;
    border-radius: 999px;
}

.modal-title {
    margin-top: 14px;
    font-size: 22px;
    font-weight: 700;
    letter-spacing: .2px;
}

.modal-body {
    margin-top: 14px;
    color: var(--ink-2);
    font-size: 15px;
    line-height: 1.8;
    white-space: pre-wrap;
    word-break: break-word;
}

.modal-actions { margin-top: 26px; }

/* ============================================
   动效 & 无障碍
   ============================================ */
:root { --ease-out: cubic-bezier(.22, .61, .36, 1); }

/* Hero 入场（纯 CSS，fail-open：始终落回可见态） */
.hero-inner > * {
    opacity: 0;
    animation: hero-in 600ms var(--ease-out) both;
}
.hero-inner > :nth-child(1) { animation-delay: 60ms; }
.hero-inner > :nth-child(2) { animation-delay: 150ms; }
.hero-inner > :nth-child(3) { animation-delay: 260ms; }
@keyframes hero-in {
    from { opacity: 0; transform: translateY(18px); }
    to   { opacity: 1; transform: none; }
}

/* 滚动显现：隐藏态仅在 .has-js 下生效 → fail-open */
.has-js .reveal {
    opacity: 0;
    transform: translateY(22px);
    transition: opacity .6s var(--ease-out), transform .6s var(--ease-out);
    transition-delay: var(--d, 0s);
}
.has-js .reveal.shown { opacity: 1; transform: none; }

/* 项目卡片顶部渐变细线 + 定位上下文 */
.project-card { position: relative; }
.project-card::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, #4d6bfe, #06b6d4);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform .5s var(--ease-out);
    z-index: 3;
}
.project-card:hover::before { transform: scaleX(1); }

/* 可访问焦点环（仅键盘导航触发） */
:where(a, button, .btn, .filter-btn, .badge, input, textarea, select):focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 6px;
}

/* 优先减少动效 */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    .hero-inner > * { opacity: 1 !important; transform: none !important; }
    .has-js .reveal, .has-js .reveal.shown { opacity: 1 !important; transform: none !important; }
    .hero-spotlight { opacity: 0 !important; }
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 720px) {
    .hero { padding: 84px 0 76px; }
    .main-nav { gap: 18px; }
    .main-nav a { font-size: 13px; }
    .form-row { grid-template-columns: 1fr; }
    .announcement-item { flex-direction: column; gap: 6px; }
    .announcement-time { padding: 0; }
}