/* Casper Talks — Atlas light theme, adapted from Casper77 DS personal_site kit */
@import url("tokens.css");

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { background: var(--bg); color: var(--fg); margin: 0; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 32px; }

/* ---------- Header ---------- */
.site-header { position: fixed; inset: 0 0 auto 0; z-index: 50; border-bottom: 1px solid transparent; color: white; transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease); }
.site-header.scrolled { background: oklch(98% 0.012 80 / 0.85); backdrop-filter: blur(14px); border-bottom-color: var(--hairline); color: var(--fg); }
.hdr-row { display: flex; align-items: center; justify-content: space-between; padding: 16px 32px; }
.brand { display: flex; align-items: baseline; text-decoration: none; color: inherit; }
.brand-text { font-family: var(--font-display); font-size: 22px; font-weight: 500; letter-spacing: -0.01em; }
.seventy { font-family: var(--font-mono); color: var(--gold); margin-left: 2px; font-size: 18px; }
.brand-sub { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; margin-left: 12px; opacity: 0.6; }
.nav { display: flex; align-items: center; gap: 28px; }
.nav a:not(.btn) { font-family: var(--font-sans-cn); font-size: 14px; text-decoration: none; color: inherit; opacity: 0.75; transition: opacity var(--dur-fast); }
.nav a:not(.btn):hover { opacity: 1; }
.btn { font-family: var(--font-sans-cn); font-weight: 500; padding: 10px 18px; border-radius: var(--radius-1); border: 1px solid transparent; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; gap: 8px; transition: all var(--dur-fast) var(--ease); font-size: 14px; }
.btn-primary { background: var(--accent); color: var(--accent-on); }
.btn-primary:hover { background: oklch(28% 0.08 264); }
.btn-gold { background: var(--gold); color: var(--accent); }
.btn-gold:hover { background: oklch(78% 0.11 82); }
.btn-outline { background: transparent; color: inherit; border-color: currentColor; }
.btn-outline:hover { background: oklch(0% 0 0 / 0.06); }
.hero .btn-outline { border-color: rgba(255,255,255,0.4); }
.hero .btn-outline:hover { background: rgba(255,255,255,0.1); }
.btn-lg { font-size: 15px; padding: 14px 24px; }
.btn-sm { font-size: 13px; padding: 8px 14px; }
.site-header:not(.scrolled) .btn-primary { background: var(--gold); color: var(--accent); }

/* ---------- Hero ---------- */
.hero { background: var(--bg-deep); color: white; min-height: 82vh; padding: 150px 0 80px; position: relative; overflow: hidden; display: flex; align-items: center; }
.hero-grid { position: absolute; inset: 0; background-image: linear-gradient(oklch(72% 0.105 82 / 0.16) 1px, transparent 1px), linear-gradient(90deg, oklch(72% 0.105 82 / 0.16) 1px, transparent 1px); background-size: 60px 60px; mask-image: radial-gradient(ellipse at 30% 40%, black 30%, transparent 80%); }
.hero-content { position: relative; max-width: 880px; }
.hero-eyebrow { display: flex; align-items: center; gap: 12px; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: rgba(255,255,255,0.7); margin-bottom: 28px; flex-wrap: wrap; }
.hero-eyebrow .dot { width: 6px; height: 6px; border-radius: 999px; background: var(--gold); }
.hero-eyebrow .sep { color: rgba(255,255,255,0.3); }
.hero-title { font-family: var(--font-display); font-weight: 400; font-size: clamp(42px, 6.5vw, 88px); line-height: 1.06; letter-spacing: -0.025em; margin: 0 0 32px; }
.hero-title em { color: var(--gold); font-style: italic; }
.hero-lede { font-family: var(--font-serif-cn); font-size: 18px; line-height: 1.75; color: rgba(255,255,255,0.78); max-width: 620px; margin: 0 0 40px; }
.hero-cta { display: flex; gap: 14px; margin-bottom: 56px; flex-wrap: wrap; }
.hero-meta { display: flex; gap: 48px; padding-top: 32px; border-top: 1px solid rgba(255,255,255,0.12); max-width: 620px; flex-wrap: wrap; }
.stat { display: flex; flex-direction: column; gap: 6px; }
.stat-n { font-family: var(--font-display); font-size: 32px; color: white; line-height: 1; }
.stat-n small { font-size: 18px; color: rgba(255,255,255,0.7); }
.stat-l { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase; color: rgba(255,255,255,0.55); }

/* ---------- Sections ---------- */
.section, .contact { scroll-margin-top: 64px; }
.section { padding: 96px 0; }
.section-head { max-width: 880px; margin-bottom: 56px; }
.eyebrow { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--gold); margin-bottom: 16px; display: block; }
.h1 { font-family: var(--font-display); font-weight: 400; font-size: clamp(34px, 5vw, 54px); line-height: 1.08; letter-spacing: -0.02em; margin: 0; }
.h1 em { color: var(--accent); font-style: italic; }
.section-lede { font-family: var(--font-serif-cn); font-size: 17px; line-height: 1.75; color: var(--fg-2); margin: 20px 0 0; max-width: 640px; }
.cn { font-family: var(--font-serif-cn); }

/* ---------- Featured talks ---------- */
.featured { background: white; border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); }
.talk-cards { display: flex; flex-direction: column; gap: 32px; }
.talk-card { display: grid; grid-template-columns: 1.2fr 1fr; gap: 48px; padding: 44px 48px; background: var(--bg); border: 1px solid var(--hairline); border-radius: var(--radius-3); position: relative; overflow: hidden; }
.talk-card::before { content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--gold); }
.tc-eyebrow { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--fg-3); margin-bottom: 14px; }
.tc-title { font-family: var(--font-serif-cn); font-size: clamp(26px, 3vw, 34px); font-weight: 500; line-height: 1.2; margin: 0 0 6px; color: var(--fg); }
.tc-subtitle { font-family: var(--font-serif-cn); font-size: 17px; color: var(--fg-2); margin: 0 0 20px; line-height: 1.5; }
.tc-meta { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 24px; }
.tag { font-family: var(--font-mono); font-size: 11px; padding: 4px 10px; border-radius: 999px; background: white; color: var(--fg-2); border: 1px solid var(--hairline); }
.tag-gold { background: var(--gold-soft); border-color: transparent; color: oklch(40% 0.08 82); }
.tc-links { display: flex; gap: 12px; flex-wrap: wrap; }
.tc-note { font-family: var(--font-sans-cn); font-size: 13px; color: var(--fg-3); margin-top: 16px; }
.tc-outline { border-left: 1px solid var(--hairline); padding-left: 32px; align-self: center; }
.tc-outline-label { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--gold); margin-bottom: 14px; }
.tc-outline ol { margin: 0; padding: 0; list-style: none; counter-reset: seg; }
.tc-outline li { font-family: var(--font-sans-cn); font-size: 14px; line-height: 1.5; color: var(--fg-2); padding: 7px 0 7px 34px; position: relative; counter-increment: seg; border-bottom: 1px solid var(--hairline); }
.tc-outline li:last-child { border-bottom: none; }
.tc-outline li::before { content: counter(seg, decimal-leading-zero); position: absolute; left: 0; top: 8px; font-family: var(--font-mono); font-size: 11px; color: var(--gold); }

/* ---------- Workshops ---------- */
.workshops { background: var(--bg); }
.ws-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.ws-card { display: block; padding: 28px; background: white; border: 1px solid var(--hairline); border-radius: var(--radius-2); text-decoration: none; color: inherit; transition: box-shadow var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease); }
.ws-card:hover { box-shadow: var(--shadow-2); transform: translateY(-2px); }
.ws-date { font-family: var(--font-mono); font-size: 11px; color: var(--gold); margin-bottom: 10px; }
.ws-title { font-family: var(--font-serif-cn); font-size: 19px; font-weight: 500; margin: 0 0 8px; color: var(--fg); }
.ws-desc { font-family: var(--font-sans-cn); font-size: 14px; line-height: 1.6; color: var(--fg-2); margin: 0 0 14px; }
.ws-link { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; color: var(--accent); }
.ws-card:hover .ws-link { text-decoration: underline; text-decoration-color: var(--gold); text-underline-offset: 3px; }

/* ---------- Timeline ---------- */
.timeline { background: white; border-top: 1px solid var(--hairline); }
.talk-list { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--hairline); }
.talk-row { display: grid; grid-template-columns: 90px 2.2fr 1.4fr 100px; gap: 24px; padding: 18px 0; border-bottom: 1px solid var(--hairline); align-items: baseline; }
.talk-date { color: var(--gold); font-size: 12px; font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.talk-topic { font-family: var(--font-serif-cn); font-size: 17px; color: var(--fg); }
.talk-venue { font-family: var(--font-sans-cn); font-size: 13px; color: var(--fg-2); }
.talk-loc { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--fg-3); text-align: right; }

/* ---------- Contact ---------- */
.contact { background: var(--bg-deep); color: white; padding: 110px 0; }
.contact .h1 { color: white; }
.contact .h1 em { color: var(--gold); }
.contact-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 64px; align-items: start; }
.contact-intro { font-family: var(--font-serif-cn); font-size: 16px; line-height: 1.8; color: rgba(255,255,255,0.78); margin: 24px 0 8px; max-width: 520px; }
.topic-list { list-style: none; padding: 0; margin: 24px 0 0; }
.topic-list li { padding: 12px 0 12px 22px; border-bottom: 1px solid rgba(255,255,255,0.12); color: rgba(255,255,255,0.85); font-family: var(--font-serif-cn); font-size: 16px; position: relative; }
.topic-list li::before { content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%); width: 10px; height: 1px; background: var(--gold); }
.contact-direct { padding: 32px; background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.12); border-radius: var(--radius-2); }
.contact-direct .eyebrow { margin-bottom: 8px; }
.email { font-family: var(--font-mono); font-size: 17px; color: white; text-decoration: none; display: block; margin: 4px 0 20px; word-break: break-all; }
.email:hover { color: var(--gold); }
.contact-hint { font-family: var(--font-mono); font-size: 11px; color: rgba(255,255,255,0.45); margin: 16px 0 0; }

/* ---------- Footer ---------- */
.site-footer { background: oklch(15% 0.04 256); color: rgba(255,255,255,0.55); padding: 40px 0; }
.ftr-row { display: flex; justify-content: space-between; align-items: baseline; gap: 24px; flex-wrap: wrap; }
.ftr-brand { font-family: var(--font-display); font-size: 18px; color: rgba(255,255,255,0.85); }
.ftr-brand .seventy { font-size: 15px; }
.ftr-note { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.06em; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .container { padding: 0 20px; }
  .hdr-row { padding: 14px 20px; }
  .nav a:not(.btn) { display: none; }
  .brand-sub { display: none; }
  .hero { padding: 120px 0 56px; min-height: auto; }
  .hero-meta { gap: 28px; }
  .section { padding: 64px 0; }
  .talk-card { grid-template-columns: 1fr; gap: 28px; padding: 28px 24px; }
  .tc-outline { border-left: none; padding-left: 0; border-top: 1px solid var(--hairline); padding-top: 24px; }
  .ws-grid { grid-template-columns: 1fr; }
  .talk-row { grid-template-columns: 1fr; gap: 4px; }
  .talk-loc { text-align: left; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
}