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

/* Variables */
:root {
    --bg: #fafafa;
    --text: #1a1a1a;
    --text-secondary: #555;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --border: #e5e5e5;
    --card-bg: #fff;
    --max-width: 760px;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", sans-serif;
    --font-mono: "SF Mono", "Fira Code", monospace;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #111;
        --text: #e5e5e5;
        --text-secondary: #999;
        --accent: #60a5fa;
        --accent-hover: #93bbfd;
        --border: #333;
        --card-bg: #1a1a1a;
    }
}

/* Base */
html { font-size: 16px; scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s;
}
a:hover { color: var(--accent-hover); }

/* Nav */
header {
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
}

nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.02em;
}
.site-title:hover { color: var(--accent); }

.nav-links { display: flex; gap: 1.5rem; }
.nav-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}
.nav-links a:hover { color: var(--text); }

/* Main */
main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem 4rem;
}

/* Hero */
.hero {
    padding: 4rem 0 3rem;
    border-bottom: 1px solid var(--border);
}

.hero h1 {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.6;
}

/* Sections */
.section {
    padding: 2.5rem 0;
    border-bottom: 1px solid var(--border);
}

.section:last-child { border-bottom: none; }

.section h2 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 1.2rem;
    letter-spacing: -0.02em;
    text-transform: uppercase;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Cards */
.cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1.25rem 1.5rem;
}

.card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.card p {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.6;
}

/* Lists */
.focus-list, .beliefs {
    list-style: none;
    padding: 0;
}

.focus-list li, .beliefs li {
    padding: 0.5rem 0;
    padding-left: 1.2rem;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.focus-list li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent);
}

.beliefs li::before {
    content: "·";
    position: absolute;
    left: 0;
    font-weight: 700;
    color: var(--accent);
}

.focus-list li strong { color: var(--text); }

/* Blockquote */
blockquote {
    border-left: 3px solid var(--accent);
    padding: 0.8rem 1.2rem;
    margin: 0 0 1rem;
    background: var(--card-bg);
    border-radius: 0 4px 4px 0;
}

blockquote p {
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: 0.05em;
}

blockquote cite {
    display: block;
    margin-top: 0.3rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-style: normal;
}

/* Post list */
.section-intro {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.post-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.post {
    display: flex;
    gap: 1.2rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
    align-items: baseline;
}

.post:last-child { border-bottom: none; }

.post time {
    flex-shrink: 0;
    font-size: 0.82rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    width: 6.5rem;
}

.post h3 {
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 0.25rem;
    color: var(--text);
}

.post h3 a {
    color: var(--text);
    transition: color 0.2s;
}

.post h3 a:hover {
    color: var(--accent);
}

.post p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.wechat-cta {
    margin-top: 1.5rem;
    padding: 1rem 1.2rem;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: center;
}

/* Footer */
footer {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem 1.5rem;
    border-top: 1px solid var(--border);
}

footer p {
    color: var(--text-secondary);
    font-size: 0.82rem;
}

/* Responsive */
@media (min-width: 640px) {
    .hero h1 { font-size: 2.4rem; }
    .cards { grid-template-columns: 1fr 1fr 1fr; }
}

@media (max-width: 480px) {
    .hero { padding: 2.5rem 0 2rem; }
    .hero h1 { font-size: 1.6rem; }
    nav { flex-direction: column; gap: 0.8rem; }
}