/* Shared base styles for article pages (manifest / ai-happiness / subagent-evolution).
   Page-specific rules and overrides stay in each page's inline <style> block,
   which is loaded after this file and therefore wins on equal specificity. */

:root {
    --red: #d21f2f;
    --red-deep: #7f1018;
    --gold: #d6aa4f;
    --gold-dim: #6f5628;
    --bg: #090909;
    --panel: #111;
    --panel-soft: #15110d;
    --text: #eee8df;
    --text-muted: #9a9187;
    --border: #322820;
    --line: #3d1519;
}

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

body {
    min-height: 100vh;
    background:
        linear-gradient(90deg, rgba(214, 170, 79, 0.035) 1px, transparent 1px),
        linear-gradient(180deg, rgba(201, 23, 30, 0.045), transparent 28rem),
        var(--bg);
    background-size: 44px 44px, 100% 100%, auto;
    color: var(--text);
    font-family: -apple-system, "Helvetica Neue", "Noto Sans SC", "PingFang SC", sans-serif;
    line-height: 1.9;
    padding: 2rem 1.5rem;
    text-rendering: optimizeLegibility;
}

::selection {
    background: var(--red-deep);
    color: #fff7ed;
}

.skip-link {
    position: fixed;
    z-index: 20;
    top: 0.8rem;
    left: 0.8rem;
    padding: 0.65rem 0.9rem;
    color: var(--bg);
    background: var(--gold);
    font-size: 0.82rem;
    font-weight: 700;
    transform: translateY(-160%);
}

.skip-link:focus {
    transform: translateY(0);
}

.container {
    position: relative;
    max-width: 920px;
    margin: 3.2rem auto;
    border: 1px solid #967737;
    border: 1px solid color-mix(in srgb, var(--gold) 70%, #000 30%);
    border-radius: 4px;
    padding: 0 3.2rem;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.025), transparent 14rem),
        linear-gradient(135deg, rgba(210, 31, 47, 0.08), transparent 18rem),
        var(--panel);
    box-shadow:
        0 0 0 1px rgba(0, 0, 0, 0.75),
        0 26px 80px rgba(0, 0, 0, 0.55);
    overflow: hidden;
}

.container::before,
.container::after {
    content: "";
    position: absolute;
    width: 7rem;
    height: 7rem;
    pointer-events: none;
}

.container::before {
    top: 0;
    left: 0;
    border-top: 2px solid var(--red);
    border-left: 2px solid var(--red);
}

.container::after {
    right: 0;
    bottom: 0;
    border-right: 2px solid var(--gold-dim);
    border-bottom: 2px solid var(--gold-dim);
}

header {
    position: relative;
    padding: 3rem 0 2.2rem;
    border-bottom: 1px solid var(--line);
    margin-bottom: 2.5rem;
}

header::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -1px;
    width: 38%;
    height: 2px;
    background: linear-gradient(90deg, var(--red), var(--gold));
}

h1 {
    font-size: 2.15rem;
    color: var(--red);
    letter-spacing: 0;
    margin-bottom: 0.6rem;
    line-height: 1.25;
    text-shadow: 0 0 22px rgba(210, 31, 47, 0.22);
}

.subtitle {
    color: var(--text-muted);
    font-size: 1rem;
}

.nav-back {
    display: inline-block;
    margin-top: 0.8rem;
    color: var(--gold);
    text-decoration: none;
    font-size: 0.85rem;
    border-bottom: 1px solid transparent;
    transition: color 0.2s, border-color 0.2s;
}

.nav-back:hover {
    color: var(--red);
    border-bottom-color: var(--red);
}

section {
    position: relative;
    margin-bottom: 2.65rem;
}

h2 {
    display: flex;
    align-items: center;
    gap: 0.72rem;
    font-size: 0.82rem;
    color: var(--gold);
    letter-spacing: 0.16em;
    margin-bottom: 1.05rem;
    font-weight: 700;
    white-space: nowrap;
}

h2::before {
    content: "";
    width: 0.62rem;
    height: 0.62rem;
    background: var(--red);
    box-shadow: 0 0 0 1px var(--gold-dim);
    transform: rotate(45deg);
    flex: 0 0 auto;
}

h2::after {
    content: "";
    height: 1px;
    background: linear-gradient(90deg, var(--border), transparent);
    flex: 1;
}

p {
    margin-bottom: 0.8rem;
    font-size: 0.95rem;
    color: #e7e2d8;
    color: color-mix(in srgb, var(--text) 92%, var(--text-muted));
}

blockquote {
    margin: 0.8rem 0 1.2rem;
    padding: 0.7rem 0 0.7rem 1.1rem;
    border-left: 2px solid var(--red);
    background: linear-gradient(90deg, rgba(210, 31, 47, 0.08), transparent);
    color: var(--text);
    font-size: 0.95rem;
}

blockquote p {
    margin-bottom: 0;
    color: var(--text);
}

hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 2.5rem 0;
}

footer {
    margin-top: 3rem;
    padding: 1.5rem 0 2rem;
    border-top: 1px solid var(--border);
    font-size: 0.78rem;
    color: #8b8177;
    text-align: center;
}

@media (max-width: 640px) {
    body {
        padding: 1rem;
    }

    .container {
        margin: 1rem auto;
        padding: 0 1.35rem;
    }

    header {
        padding-top: 2.7rem;
    }

    h1 {
        font-size: 1.68rem;
    }

    h2 {
        letter-spacing: 0.08em;
    }
}