/* ========================================
   Underground Theme — bunkerist
   ======================================== */

:root,
[data-theme="dark"] {
    --bg: #0a0a12;
    --bg-surface: #12121e;
    --bg-surface-raised: #1a1a2a;
    --border: rgba(255,255,255,0.08);
    --border-strong: rgba(255,255,255,0.14);
    --text: #e0e0e0;
    --text-strong: #fff;
    --text-muted: rgba(255,255,255,0.4);
    --accent: #e94560;
    --accent-hover: #d63b54;
    --accent-glow: rgba(233,69,96,0.15);
    --code-bg: rgba(255,255,255,0.06);
    --tag-bg: rgba(255,255,255,0.06);
    --shadow: 0 2px 20px rgba(0,0,0,0.4);
}

[data-theme="light"] {
    --bg: #f0f0f4;
    --bg-surface: #fff;
    --bg-surface-raised: #f8f8fa;
    --border: #e0e0e4;
    --border-strong: #d0d0d4;
    --text: #2a2a3e;
    --text-strong: #0a0a12;
    --text-muted: #888;
    --accent: #e94560;
    --accent-hover: #d63b54;
    --accent-glow: rgba(233,69,96,0.12);
    --code-bg: #f0f0f4;
    --tag-bg: #eee;
    --shadow: 0 2px 12px rgba(0,0,0,0.06);
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    transition: background 0.3s, color 0.3s;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

/* Container */
.container { max-width: 800px; margin: 0 auto; padding: 0 1.5rem; }

/* ---- Header ---- */
.site-header {
    padding: 1rem 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    margin-bottom: 2.5rem;
}
.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.site-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-strong);
    text-decoration: none;
    letter-spacing: -0.02em;
}
.site-header__right {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}
.site-nav { display: flex; gap: 0.25rem; }
.site-nav__link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 0.3rem 0.6rem;
    border-radius: 2px;
    transition: color 0.2s, background 0.2s;
}
.site-nav__link:hover { color: var(--text-strong); background: var(--accent-glow); }
.site-nav__link.active { color: var(--accent); background: var(--accent-glow); }

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-muted);
    cursor: pointer;
    width: 30px;
    height: 30px;
    border-radius: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s, border-color 0.2s;
}
.theme-toggle:hover { color: var(--text-strong); border-color: var(--border-strong); }
.theme-toggle__icon--light { display: none; }
.theme-toggle__icon--dark { display: block; }
[data-theme="light"] .theme-toggle__icon--light { display: block; }
[data-theme="light"] .theme-toggle__icon--dark { display: none; }

/* ---- Content ---- */
.content { font-size: 1rem; color: var(--text); }
.content h1, .content h2, .content h3 { margin: 1.5em 0 0.5em; line-height: 1.3; color: var(--text-strong); }
.content p { margin-bottom: 1em; }
.content img { max-width: 100%; height: auto; border-radius: 2px; margin: 1em 0; }
.content a { color: var(--accent); }
.content code { font-family: 'SFMono-Regular', Consolas, monospace; background: var(--code-bg); padding: 0.15em 0.4em; border-radius: 2px; font-size: 0.9em; }
.content pre { background: #0a0a12; color: #e0e0e0; padding: 1rem; border-radius: 2px; overflow-x: auto; margin: 1em 0; border: 1px solid rgba(255,255,255,0.06); }
.content pre code { background: none; padding: 0; }
.content blockquote { border-left: 3px solid var(--accent); padding-left: 1rem; color: var(--text-muted); margin: 1em 0; }
.content table { width: 100%; border-collapse: collapse; margin: 1em 0; }
.content th, .content td { padding: 0.5rem 0.75rem; border: 1px solid var(--border); text-align: left; }
.content th { font-weight: 600; color: var(--text-strong); }

/* ---- Hero (Homepage) ---- */
.hero { margin-bottom: 2.5rem; }
.hero h1 { font-size: 2.2rem; line-height: 1.2; color: var(--text-strong); margin-bottom: 1rem; }
.hero__image { width: 100%; height: 300px; object-fit: cover; border-radius: 2px; }

/* ---- Blog Header ---- */
.blog-header { margin-bottom: 2.5rem; }
.blog-header h1 { font-size: 2rem; color: var(--text-strong); margin-bottom: 0.5rem; }
.blog-header__desc { color: var(--text-muted); }
.blog-header__desc p { margin-bottom: 0; }

/* ---- Post Grid ---- */
.post-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
@media (max-width: 640px) { .post-grid { grid-template-columns: 1fr; } }

.post-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 2px;
    overflow: hidden;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.post-card:hover {
    border-color: var(--border-strong);
    box-shadow: var(--shadow);
}
.post-card__image-link { display: block; overflow: hidden; }
.post-card__image { width: 100%; height: 180px; object-fit: cover; display: block; }
.post-card__body { padding: 1rem; }
.post-card__meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}
.post-card__title { font-size: 1.05rem; line-height: 1.4; margin-bottom: 0.5rem; }
.post-card__title a { color: var(--text-strong); text-decoration: none; }
.post-card__title a:hover { color: var(--accent); }
.post-card__tags { display: flex; flex-wrap: wrap; gap: 0.3rem; }

/* Tags */
.tag {
    display: inline-block;
    background: var(--tag-bg);
    padding: 0.15rem 0.5rem;
    border-radius: 2px;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: background 0.2s, color 0.2s;
}
a.tag:hover { background: var(--accent-glow); color: var(--accent); }

/* Tag Filter */
.tag-filter {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    padding: 0.6rem 1rem;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 2px;
    font-size: 0.85rem;
    color: var(--text-muted);
}
.tag-filter__clear { font-size: 0.8rem; margin-left: auto; }
.no-results { color: var(--text-muted); font-size: 0.95rem; }

/* ---- Single Post ---- */
.post { margin-bottom: 3rem; }
.post__header { margin-bottom: 1.5rem; }
.post__header h1 { font-size: 2rem; color: var(--text-strong); margin-bottom: 0.5rem; }
.post__date { font-size: 0.85rem; color: var(--text-muted); }
.post__author { font-size: 0.85rem; color: var(--text-muted); margin-left: 0.5rem; }
.post__featured-image { width: 100%; border-radius: 2px; margin-bottom: 1.5rem; }
.post__footer { margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid var(--border); }
.post__tags { display: flex; flex-wrap: wrap; gap: 0.3rem; }
.post__nav { padding-top: 1.5rem; border-top: 1px solid var(--border); }
.post__nav a { color: var(--text-muted); font-size: 0.9rem; }
.post__nav a:hover { color: var(--accent); }

/* ---- Error ---- */
.error-page { text-align: center; padding: 5rem 0; }
.error-page h1 { font-size: 5rem; color: var(--accent); margin-bottom: 0.5rem; }
.error-page p { font-size: 1.1rem; color: var(--text-muted); margin-bottom: 2rem; }

/* ---- Button ---- */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--accent);
    color: #fff;
    text-decoration: none;
    border-radius: 2px;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    transition: background 0.2s;
}
.btn:hover { background: var(--accent-hover); color: #fff; }

/* ---- Footer ---- */
.site-footer {
    margin-top: 4rem;
    padding: 1.5rem 0;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.85rem;
}
.site-footer a { color: var(--text-muted); }
.site-footer a:hover { color: var(--accent); }

.site-logo { max-height: 40px; width: auto; display: block; }