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

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f7fafc;
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --accent: #52adc8;
    --accent-hover: #3d8ba6;
    --code-bg: #f3f4f6;
    --blockquote-border: #9acddb;
    --shadow: 0 8px 20px rgba(31, 41, 55, 0.08);
}

body.dark-theme {
    --bg-primary: #12181f;
    --bg-secondary: #1a2330;
    --text-primary: #e5e7eb;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #2a3648;
    --accent: #6bc1dc;
    --accent-hover: #82d0e8;
    --code-bg: #0f1720;
    --blockquote-border: #4a7181;
    --shadow: 0 8px 22px rgba(0, 0, 0, 0.28);
}

html {
    scroll-behavior: smooth;
}

body {
    background: radial-gradient(circle at 20% 10%, rgba(82, 173, 200, 0.12), transparent 42%),
        radial-gradient(circle at 80% -10%, rgba(82, 173, 200, 0.08), transparent 35%),
        var(--bg-primary);
    color: var(--text-primary);
    font-family: "Noto Serif", "PT Serif", "Source Serif Pro", Georgia, "Times New Roman", serif;
    line-height: 1.72;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.container {
    margin: 0 auto;
    max-width: 960px;
    padding: 0 24px;
}

.site-header {
    backdrop-filter: blur(8px);
    background-color: color-mix(in srgb, var(--bg-primary) 86%, transparent);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 20;
}

.nav {
    align-items: center;
    display: flex;
    justify-content: space-between;
    min-height: 64px;
}

.brand {
    color: var(--text-primary);
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.brand:hover {
    color: var(--accent-hover);
    text-decoration: none;
}

.nav-right {
    align-items: center;
    display: flex;
    gap: 1rem;
}

.nav-right a {
    color: var(--text-muted);
    font-size: 0.95rem;
    font-weight: 500;
}

.nav-right a.active {
    color: var(--accent);
}

.theme-toggle {
    background: none;
    border: none;
    border-radius: 50%;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    height: 36px;
    padding: 0.5rem;
    transition: color 0.2s, background-color 0.2s;
    width: 36px;
}

.theme-toggle:hover {
    color: var(--accent);
    background-color: var(--border-color);
}

.theme-toggle.is-active {
    color: var(--accent);
    background-color: rgba(82, 173, 200, 0.16);
}

body.dark-theme .theme-toggle.is-active {
    background-color: rgba(107, 193, 220, 0.24);
}

.unlock-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    padding: 0.34rem 0.78rem;
    transition: color 0.2s, border-color 0.2s, background-color 0.2s;
}

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

.unlock-btn.is-active {
    border-color: rgba(82, 173, 200, 0.35);
    color: var(--accent);
    background-color: rgba(82, 173, 200, 0.14);
}

body.dark-theme .unlock-btn.is-active {
    border-color: rgba(107, 193, 220, 0.45);
    background-color: rgba(107, 193, 220, 0.2);
}

.lang-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    cursor: pointer;
    display: grid;
    grid-template-columns: 1fr 1fr;
    height: 32px;
    padding: 2px;
    position: relative;
    transition: border-color 0.2s, background-color 0.2s;
    width: 64px;
}

.lang-toggle:hover {
    border-color: var(--accent);
}

.lang-toggle:disabled {
    cursor: not-allowed;
    opacity: 0.55;
}

.lang-toggle::before {
    background-color: rgba(82, 173, 200, 0.14);
    border-radius: 999px;
    content: "";
    inset: 2px auto 2px 2px;
    position: absolute;
    transition: transform 0.18s ease;
    width: calc(50% - 2px);
}

body.dark-theme .lang-toggle::before {
    background-color: rgba(107, 193, 220, 0.18);
}

body[data-lang="zh"] .lang-toggle::before {
    transform: translateX(100%);
}

.lang-toggle__option {
    align-items: center;
    color: var(--text-muted);
    display: flex;
    font-size: 0.72rem;
    font-weight: 800;
    justify-content: center;
    letter-spacing: 0.06em;
    position: relative;
    text-transform: uppercase;
    user-select: none;
    z-index: 1;
}

.lang-toggle__option[data-opt="en"] {
    color: var(--accent);
}

body[data-lang="zh"] .lang-toggle__option[data-opt="en"] {
    color: var(--text-muted);
}

body[data-lang="zh"] .lang-toggle__option[data-opt="zh"] {
    color: var(--accent);
}

.hero {
    margin: 2.6rem 0 1.8rem;
}

.hero h1 {
    color: var(--text-primary);
    font-size: clamp(2rem, 3.8vw, 2.8rem);
    margin-bottom: 0.7rem;
}

.hero p {
    color: var(--text-secondary);
    max-width: 42rem;
}

.secret-hint {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 0.7rem;
}

.post-list {
    display: grid;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.post-card[data-secret="true"] {
    display: none;
}

body.show-secret-posts .post-card[data-secret="true"] {
    display: block;
}

.post-card {
    background: color-mix(in srgb, var(--bg-secondary) 70%, var(--bg-primary));
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 1.2rem 1.3rem;
}

.post-card h2 {
    font-size: 1.35rem;
    line-height: 1.35;
    margin-bottom: 0.35rem;
}

.post-card .meta {
    color: var(--text-muted);
    font-size: 0.88rem;
    margin-bottom: 0.5rem;
}

.secret-badge {
    background: rgba(82, 173, 200, 0.15);
    border: 1px solid rgba(82, 173, 200, 0.35);
    border-radius: 999px;
    color: var(--accent);
    display: inline-block;
    font-size: 0.73rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    margin-bottom: 0.5rem;
    padding: 0.09rem 0.5rem;
    text-transform: uppercase;
}

.post-card p {
    color: var(--text-secondary);
    margin-bottom: 0.55rem;
}

.read-more {
    display: inline-block;
    font-size: 0.92rem;
    font-weight: 600;
}

.empty {
    border: 1px dashed var(--border-color);
    border-radius: 10px;
    color: var(--text-secondary);
    padding: 1rem;
}

.post {
    margin: 1.8rem 0 2.4rem;
}

.secret-gate {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin: 1.8rem 0 2.4rem;
    padding: 1.25rem 1.3rem;
    background: color-mix(in srgb, var(--bg-secondary) 70%, var(--bg-primary));
}

.secret-gate h2 {
    color: var(--text-primary);
    font-size: 1.2rem;
    margin-bottom: 0.45rem;
}

.secret-gate p {
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

body[data-post-secret="true"] #post-content {
    display: none;
}

body[data-post-secret="true"] #secret-locked-message {
    display: block;
}

body[data-post-secret="true"].secret-unlocked #post-content {
    display: block;
}

body[data-post-secret="true"].secret-unlocked #secret-locked-message {
    display: none;
}

.is-hidden {
    display: none !important;
}

.back-link {
    color: var(--text-muted);
    display: inline-block;
    font-size: 0.9rem;
    margin-bottom: 0.8rem;
}

.post-header {
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.2rem;
    padding-bottom: 0.9rem;
}

.post-header h1 {
    font-size: clamp(1.9rem, 4vw, 2.6rem);
    line-height: 1.25;
    margin-bottom: 0.4rem;
}

.post-header .meta {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 0.45rem;
}

.post-header .summary {
    color: var(--text-secondary);
    font-size: 0.97rem;
}

.markdown-body > * {
    margin-bottom: 0.95rem;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
    color: var(--text-primary);
    line-height: 1.35;
    margin-top: 1.3rem;
    margin-bottom: 0.6rem;
}

.markdown-body h1 {
    font-size: 1.85rem;
}

.markdown-body h2 {
    border-bottom: 1px solid var(--border-color);
    font-size: 1.45rem;
    padding-bottom: 0.35rem;
}

.markdown-body h3 {
    font-size: 1.2rem;
}

.markdown-body p,
.markdown-body li,
.markdown-body blockquote {
    color: var(--text-secondary);
}

.markdown-body ul,
.markdown-body ol {
    padding-left: 1.35rem;
}

.markdown-body li {
    margin-bottom: 0.35rem;
}

.markdown-body pre {
    background: var(--code-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    overflow-x: auto;
    padding: 0.7rem 0.78rem;
}

.markdown-body code {
    background: var(--code-bg);
    border-radius: 6px;
    font-family: "Consolas", "Monaco", "Courier New", monospace;
    font-size: 0.86em;
    padding: 0.1rem 0.32rem;
}

.markdown-body pre code {
    background: transparent;
    border-radius: 0;
    font-family: "Menlo", "Consolas", "Liberation Mono", "Courier New", monospace;
    font-size: 0.8rem;
    line-height: 1.45;
    letter-spacing: -0.01em;
    -moz-tab-size: 4;
    padding: 0;
    tab-size: 4;
}

.markdown-body pre code.hljs {
    background: transparent;
    display: block;
    padding: 0;
}

.markdown-body blockquote {
    border-left: 4px solid var(--blockquote-border);
    margin: 1rem 0;
    padding: 0.2rem 0 0.2rem 0.95rem;
}

.markdown-body img {
    border-radius: 10px;
    display: block;
    margin: 1.1rem auto;
    max-width: 100%;
}

.markdown-body hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 1.2rem 0;
}

.footer {
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.86rem;
    margin-bottom: 1.5rem;
    padding-top: 1rem;
}

@media (max-width: 760px) {
    .container {
        padding: 0 16px;
    }

    .nav {
        align-items: flex-start;
        flex-direction: column;
        gap: 0.6rem;
        padding: 0.7rem 0;
    }

    .nav-right {
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .hero {
        margin-top: 2rem;
    }

    .post-card {
        padding: 1rem;
    }
}