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

:root {
  --bg: #0f0f11;
  --bg2: #17171a;
  --bg3: #1e1e23;
  --border: #2a2a32;
  --text: #e8e8ec;
  --text2: #9090a0;
  --accent: #7c6fde;
  --accent2: #a598f5;
  --tag-bg: rgba(124,111,222,0.12);
  --tag-color: #a598f5;
  --warn: #f0a050;
  --warn-bg: rgba(240,160,80,0.08);
  --font: 'Inter', 'PingFang SC', 'Hiragino Sans GB', system-ui, sans-serif;
}

html { font-size: 16px; scroll-behavior: smooth; }
body { background: var(--bg); color: var(--text); font-family: var(--font); line-height: 1.7; min-height: 100vh; }

a { color: var(--accent2); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── NAV ── */
nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2rem; height: 56px;
  border-bottom: 1px solid var(--border);
  background: rgba(15,15,17,0.85); backdrop-filter: blur(12px);
  position: sticky; top: 0; z-index: 100;
}
.nav-logo { font-weight: 700; font-size: 1rem; letter-spacing: -0.02em; color: var(--text); }
.nav-logo span { color: var(--accent2); }
.nav-links { display: flex; gap: 1.5rem; }
.nav-links a { color: var(--text2); font-size: 0.9rem; transition: color .15s; }
.nav-links a:hover { color: var(--text); text-decoration: none; }

/* ── HERO (index only) ── */
.hero {
  padding: 5rem 2rem 3rem;
  max-width: 860px; margin: 0 auto;
}
.hero-eyebrow { font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent2); margin-bottom: 1rem; }
.hero h1 { font-size: clamp(2rem,5vw,3rem); font-weight: 800; letter-spacing: -0.03em; line-height: 1.15; }
.hero p { margin-top: 1.2rem; color: var(--text2); font-size: 1.05rem; max-width: 560px; }

/* ── ARTICLE CARDS ── */
.articles-section { max-width: 860px; margin: 0 auto; padding: 2rem 2rem 5rem; }
.section-label { font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text2); margin-bottom: 1.5rem; padding-bottom: 0.75rem; border-bottom: 1px solid var(--border); }

.card-grid { display: flex; flex-direction: column; gap: 1rem; }

.card {
  display: block;
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 12px; padding: 1.5rem 1.75rem;
  transition: border-color .2s, transform .15s;
  color: var(--text);
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }

.card-meta { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.7rem; }
.card-date { font-size: 0.8rem; color: var(--text2); }
.tag { font-size: 0.72rem; padding: 2px 8px; border-radius: 4px; background: var(--tag-bg); color: var(--tag-color); font-weight: 500; }
.card h2 { font-size: 1.15rem; font-weight: 700; letter-spacing: -0.02em; line-height: 1.35; margin-bottom: 0.5rem; }
.card p { font-size: 0.9rem; color: var(--text2); }
.card-arrow { float: right; color: var(--accent2); font-size: 1.1rem; }

/* ── ARTICLE PAGE ── */
.article-wrap { max-width: 740px; margin: 0 auto; padding: 3rem 2rem 6rem; }

.article-header { margin-bottom: 2.5rem; }
.article-back { display: inline-flex; align-items: center; gap: 0.4rem; font-size: 0.85rem; color: var(--text2); margin-bottom: 2rem; transition: color .15s; }
.article-back:hover { color: var(--text); text-decoration: none; }

.article-eyebrow { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1rem; }
.article-date { font-size: 0.82rem; color: var(--text2); }
.article-header h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); font-weight: 800; letter-spacing: -0.03em; line-height: 1.25; }
.article-header .subtitle { margin-top: 1rem; color: var(--text2); font-size: 0.95rem; line-height: 1.6; }

.divider { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }

/* ── ARTICLE BODY ── */
.article-body h2 {
  font-size: 1.25rem; font-weight: 700; letter-spacing: -0.02em;
  margin: 2.5rem 0 0.9rem; color: var(--text);
}
.article-body h3 {
  font-size: 1.05rem; font-weight: 600; margin: 1.75rem 0 0.6rem; color: var(--text);
}
.article-body p { margin-bottom: 1rem; font-size: 0.97rem; color: var(--text); }
.article-body ul, .article-body ol { padding-left: 1.5rem; margin-bottom: 1rem; }
.article-body li { margin-bottom: 0.4rem; font-size: 0.97rem; }
.article-body strong { color: var(--text); font-weight: 600; }

.article-body blockquote {
  border-left: 3px solid var(--border);
  padding: 0.6rem 1.2rem; margin: 1.25rem 0;
  background: var(--bg2); border-radius: 0 8px 8px 0;
  color: var(--text2); font-size: 0.9rem;
}

.warn-box {
  background: var(--warn-bg); border: 1px solid rgba(240,160,80,0.2);
  border-radius: 8px; padding: 0.85rem 1.1rem; margin: 0.5rem 0;
  font-size: 0.88rem; color: var(--warn);
}

/* table */
.table-wrap { overflow-x: auto; margin: 1.25rem 0; }
table { width: 100%; border-collapse: collapse; font-size: 0.87rem; }
th { background: var(--bg3); color: var(--text2); text-align: left; padding: 0.6rem 0.9rem; font-weight: 600; border-bottom: 1px solid var(--border); }
td { padding: 0.6rem 0.9rem; border-bottom: 1px solid var(--border); vertical-align: top; }
tr:last-child td { border-bottom: none; }

/* ── FOOTER ── */
footer { border-top: 1px solid var(--border); padding: 1.75rem 2rem; text-align: center; font-size: 0.82rem; color: var(--text2); }
footer span { color: var(--text2); }

/* ── RESPONSIVE ── */
@media (max-width: 600px) {
  nav { padding: 0 1rem; }
  .hero, .articles-section, .article-wrap { padding-left: 1.2rem; padding-right: 1.2rem; }
  .card { padding: 1.2rem; }
}