/* ============================================
   AI大模型应用日报 - Editorial Tech 设计
   美学方向：深色编辑杂志风 + 科技质感
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;600;700;900&family=Noto+Sans+SC:wght@300;400;500;700&family=JetBrains+Mono:wght@400;600&display=swap');

:root {
    /* 色彩系统 - 深色暖调 */
    --bg: #0f0f12;
    --bg-elevated: #1a1a20;
    --bg-card: #16161c;
    --bg-hover: #1e1e26;
    --text: #e8e6e3;
    --text-secondary: #a8a4a0;
    --text-muted: #6b6764;
    --border: #2a2a32;
    --border-light: #35353f;
    --accent: #e8a838;
    --accent-dim: #b8862c;
    --accent-glow: rgba(232, 168, 56, 0.12);
    --link: #6cb6ff;
    --link-hover: #8ecbff;
    --danger: #e57373;
    --success: #81c784;
    --radius: 4px;
    --radius-lg: 8px;
    --shadow: 0 4px 24px rgba(0,0,0,0.4);
    --shadow-hover: 0 8px 40px rgba(0,0,0,0.5);
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --font-serif: "Noto Serif SC", "Songti SC", "STSong", serif;
    --font-sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    --font-mono: "JetBrains Mono", "SF Mono", "Consolas", monospace;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* 背景纹理 */
body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: 
        radial-gradient(ellipse at 20% 0%, rgba(232, 168, 56, 0.04) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 100%, rgba(108, 182, 255, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 28px;
    position: relative;
    z-index: 1;
}

/* ============================================
   Header
   ============================================ */
header {
    position: relative;
    padding: 100px 0 64px;
    border-bottom: 1px solid var(--border);
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: 
        linear-gradient(180deg, rgba(232, 168, 56, 0.03) 0%, transparent 100%),
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100'%3E%3Ccircle cx='50' cy='50' r='0.5' fill='%2335353f'/%3E%3C/svg%3E");
    background-size: 100% 100%, 24px 24px;
    pointer-events: none;
}

header .container {
    position: relative;
    z-index: 1;
}

.header-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 20px;
    animation: fadeInUp 0.6s ease;
}

.header-label::before {
    content: '';
    width: 24px;
    height: 1px;
    background: var(--accent);
}

header h1 {
    font-family: var(--font-serif);
    font-size: 2.4rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.25;
    color: var(--text);
    margin-bottom: 16px;
    animation: fadeInUp 0.6s ease 0.1s both;
}

header h1 .accent {
    color: var(--accent);
    font-style: italic;
}

header .subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 480px;
    animation: fadeInUp 0.6s ease 0.2s both;
}

header .header-meta {
    display: flex;
    gap: 24px;
    margin-top: 32px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    animation: fadeInUp 0.6s ease 0.3s both;
}

header .header-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

header .header-meta span::before {
    content: '';
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--accent-dim);
}

/* ============================================
   Main Layout
   ============================================ */
main {
    padding: 56px 0 80px;
    position: relative;
    z-index: 1;
}

section {
    margin-bottom: 64px;
}

.section-title {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 28px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.section-title h2 {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text);
    letter-spacing: 0.02em;
}

.section-title .section-num {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-dim);
    letter-spacing: 0.1em;
}

/* ============================================
   日报卡片
   ============================================ */
.daily-list {
    display: flex;
    flex-direction: column;
    gap: 1px;
    background: var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.daily-card {
    display: block;
    text-decoration: none;
    color: inherit;
    background: var(--bg-card);
    padding: 28px;
    transition: background var(--transition), transform var(--transition);
    position: relative;
    overflow: hidden;
}

.daily-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--accent);
    transform: scaleY(0);
    transform-origin: top;
    transition: transform var(--transition);
}

.daily-card:hover {
    background: var(--bg-hover);
}

.daily-card:hover::before {
    transform: scaleY(1);
}

.daily-card .card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
}

.daily-card .date {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.daily-card .date-badge {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--accent);
    border: 1px solid var(--accent-dim);
    padding: 2px 10px;
    border-radius: 2px;
    letter-spacing: 0.05em;
}

.daily-card .title {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
    line-height: 1.5;
    color: var(--text);
    transition: color var(--transition);
}

.daily-card:hover .title {
    color: var(--accent);
}

.daily-card .summary {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.75;
    margin-bottom: 14px;
}

.daily-card .tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--text-muted);
    padding: 2px 8px;
    border: 1px solid var(--border-light);
    border-radius: 2px;
    letter-spacing: 0.03em;
}

/* ============================================
   关于
   ============================================ */
.about {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--border);
}

.about p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.85;
}

.about .about-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent-dim);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 12px;
}

/* ============================================
   日报详情页
   ============================================ */
.daily-content {
    padding-top: 0;
}

.daily-content h1 {
    font-family: var(--font-serif);
    font-size: 1.7rem;
    font-weight: 700;
    margin-bottom: 10px;
    line-height: 1.35;
    color: var(--text);
    letter-spacing: -0.01em;
}

.daily-content .meta {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 36px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 12px;
}

.daily-content .meta::after {
    content: '';
    flex: 1;
    height: 1px;
    background: linear-gradient(to right, var(--border), transparent);
}

.daily-content h2 {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 600;
    margin: 40px 0 18px;
    color: var(--text);
    padding-left: 14px;
    border-left: 3px solid var(--accent);
    line-height: 1.4;
}

.daily-content h3 {
    font-size: 0.98rem;
    font-weight: 600;
    margin: 28px 0 10px;
    color: var(--text);
    line-height: 1.5;
}

.daily-content p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.95;
    margin-bottom: 16px;
}

.daily-content p strong {
    color: var(--text);
    font-weight: 600;
}

/* 无序列表 */
.daily-content ul {
    list-style: none;
    padding-left: 0;
    margin-bottom: 16px;
}

.daily-content ul li {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 14px;
    padding-left: 20px;
    position: relative;
}

.daily-content ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 13px;
    width: 6px;
    height: 1px;
    background: var(--accent);
}

.daily-content ul li strong {
    color: var(--text);
    font-weight: 600;
}

/* 有序列表 */
.daily-content ol {
    list-style: none;
    padding-left: 0;
    counter-reset: ol-counter;
    margin-bottom: 16px;
}

.daily-content ol li {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 14px;
    padding-left: 32px;
    position: relative;
    counter-increment: ol-counter;
}

.daily-content ol li::before {
    content: counter(ol-counter, decimal-leading-zero);
    position: absolute;
    left: 0;
    top: 2px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--accent-dim);
    font-weight: 600;
    letter-spacing: 0.05em;
}

/* 链接 */
.daily-content a {
    color: var(--link);
    text-decoration: none;
    border-bottom: 1px solid rgba(108, 182, 255, 0.3);
    transition: border-color var(--transition), color var(--transition);
}

.daily-content a:hover {
    color: var(--link-hover);
    border-bottom-color: var(--link-hover);
}

/* 分隔线 */
.daily-content hr {
    border: none;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border-light), transparent);
    margin: 32px 0;
}

/* 引用块 */
.daily-content blockquote {
    margin: 24px 0;
    padding: 20px 24px;
    background: var(--bg-elevated);
    border-left: 2px solid var(--accent-dim);
    border-radius: 0 var(--radius) var(--radius) 0;
}

.daily-content blockquote p {
    margin-bottom: 0;
    font-size: 0.82rem;
    color: var(--text-muted);
    font-style: italic;
}

/* 行内代码 */
.daily-content code {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    background: var(--bg-elevated);
    padding: 2px 6px;
    border-radius: 3px;
    color: var(--accent);
    border: 1px solid var(--border);
}

/* 编辑推荐 */
.daily-content .editor-pick {
    margin-top: 48px;
    padding: 32px;
    background: linear-gradient(135deg, var(--bg-elevated) 0%, var(--bg-card) 100%);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    position: relative;
    overflow: hidden;
}

.daily-content .editor-pick::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(to right, var(--accent), transparent);
}

.daily-content .editor-pick h2 {
    margin-top: 0;
    border-left: none;
    padding-left: 0;
    color: var(--accent);
}

.daily-content .editor-pick h3 {
    color: var(--accent);
}

.daily-content .editor-pick p {
    color: var(--text);
}

.daily-content .editor-pick blockquote {
    background: rgba(232, 168, 56, 0.05);
}

/* 返回链接 */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 36px;
    color: var(--text-muted);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.03em;
    transition: color var(--transition);
    padding: 6px 0;
}

.back-link:hover {
    color: var(--accent);
}

.back-link::before {
    content: '←';
    transition: transform var(--transition);
}

.back-link:hover::before {
    transform: translateX(-3px);
}

/* ============================================
   Footer
   ============================================ */
footer {
    text-align: center;
    padding: 40px 0 56px;
    color: var(--text-muted);
    font-size: 0.78rem;
    border-top: 1px solid var(--border);
    position: relative;
    z-index: 1;
}

footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

footer .footer-label {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent-dim);
}

/* ============================================
   Loading
   ============================================ */
.loading {
    text-align: center;
    color: var(--text-muted);
    padding: 80px 0;
    font-size: 0.85rem;
    font-family: var(--font-mono);
    letter-spacing: 0.05em;
}

.loading::after {
    content: '...';
    animation: dots 1.5s steps(4) infinite;
}

@keyframes dots {
    0%, 25% { content: '.'; }
    50% { content: '..'; }
    75%, 100% { content: '...'; }
}

/* ============================================
   动画
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.daily-card {
    animation: fadeInUp 0.4s ease both;
}

.daily-card:nth-child(1) { animation-delay: 0.05s; }
.daily-card:nth-child(2) { animation-delay: 0.1s; }
.daily-card:nth-child(3) { animation-delay: 0.15s; }
.daily-card:nth-child(4) { animation-delay: 0.2s; }
.daily-card:nth-child(5) { animation-delay: 0.25s; }
.daily-card:nth-child(6) { animation-delay: 0.3s; }

/* ============================================
   响应式
   ============================================ */
@media (max-width: 600px) {
    header { padding: 72px 0 48px; }
    header h1 { font-size: 1.7rem; }
    main { padding: 40px 0 56px; }
    section { margin-bottom: 48px; }
    .daily-card { padding: 22px; }
    .daily-card .title { font-size: 1rem; }
    .daily-content h1 { font-size: 1.35rem; }
    .daily-content h2 { font-size: 1.1rem; }
    .container { padding: 0 20px; }
    .about { padding: 24px; }
    .daily-content .editor-pick { padding: 24px; }
}