/* PenEcho sponsors page — Swiss Canvas design language. */

:root {
  --bg: #fafafa;
  --card: #ffffff;
  --ink: #18181b;
  --muted: #52525b;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --line: #e4e4e7;
  --gold: #8a5a00;
  --gold-deep: #5f3e00;
  --gold-soft: #fff7dc;
  --gold-line: #d8b75b;
  --radius: 14px;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }

.sponsors-body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font: 400 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}

:where(.sponsors-body) a { color: var(--accent); text-decoration: none; }
.sponsors-body a:hover { text-decoration: underline; }
.sponsors-body :focus-visible { outline: 3px solid rgba(37, 99, 235, 0.38); outline-offset: 3px; }

/* ---------- top navigation ---------- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 32px;
  height: 52px;
  padding: 0 max(22px, calc((100vw - 980px) / 2));
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--line);
}

.site-nav-logo { color: var(--ink); font-size: 17px; font-weight: 600; letter-spacing: -0.02em; }
.site-nav-logo:hover { text-decoration: none; }

.site-nav nav { display: flex; gap: 26px; }
.site-nav nav a { color: var(--ink); font-size: 13.5px; opacity: 0.82; }
.site-nav nav a:hover { opacity: 1; text-decoration: none; }
.site-nav nav a[aria-current="page"] { opacity: 1; font-weight: 600; }

.sponsors-nav-spacer { flex: 1; display: flex; justify-content: flex-end; align-items: center; gap: 14px; }
.nav-login { font-size: 13.5px; color: var(--ink); opacity: 0.82; }
.nav-login:hover { opacity: 1; text-decoration: none; }

/* ---------- hero ---------- */

.sponsors-main {
  width: min(980px, calc(100% - 44px));
  margin: 0 auto;
  padding: clamp(56px, 9vh, 96px) 0 72px;
}

.sponsors-hero { text-align: center; }
.sponsors-kicker {
  margin: 0;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.sponsors-hero h1 {
  margin: 10px 0 0;
  font-size: clamp(38px, 5vw, 56px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.08;
}
.sponsors-lead { max-width: 56ch; margin: 18px auto 0; color: var(--muted); font-size: 17px; }
.sponsors-hero .sponsors-button { margin-top: 28px; }

.sponsors-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  font-weight: 500;
}
.sponsors-button:hover { background: var(--accent-hover); text-decoration: none; }
.sponsors-button.ghost { background: var(--card); color: var(--accent); border: 1px solid var(--line); }
.sponsors-button.ghost:hover { border-color: var(--accent); }

/* ---------- sections ---------- */

.sponsors-section { margin-top: clamp(44px, 7vh, 72px); }
.sponsors-section-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}
.sponsors-section-head h2 { margin: 0; font-size: 26px; font-weight: 700; letter-spacing: -0.02em; }
.sponsors-label {
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
}

/* golden sponsor — always the first sponsorship placement */

.golden-sponsor {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(170px, 220px) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 58px);
  align-items: center;
  padding: clamp(32px, 5vw, 58px);
  background: linear-gradient(135deg, #fffdf6 0%, var(--gold-soft) 100%);
  border: 1px solid var(--gold-line);
  border-radius: calc(var(--radius) + 4px);
  box-shadow: 0 20px 50px rgba(95, 62, 0, 0.10);
}
.golden-sponsor::after {
  position: absolute;
  z-index: -1;
  right: -78px;
  top: -104px;
  width: 250px;
  height: 250px;
  border: 1px solid rgba(138, 90, 0, 0.18);
  border-radius: 50%;
  content: "";
}
.golden-mark {
  display: grid;
  place-items: center;
  align-content: center;
  aspect-ratio: 1;
  border: 1px solid var(--gold-line);
  border-radius: 50%;
  background: var(--ink);
  color: #f6d67a;
  box-shadow: inset 0 0 0 8px rgba(246, 214, 122, 0.08);
}
.golden-mark strong { font-family: Georgia, serif; font-size: clamp(56px, 8vw, 84px); font-weight: 500; line-height: 0.86; }
.golden-mark span { margin-top: 12px; color: #fff7dc; font-size: 11px; font-weight: 700; letter-spacing: 0.18em; text-transform: uppercase; }
.golden-copy .sponsors-kicker { color: var(--gold-deep); }
.golden-copy h3 { margin: 7px 0 0; font-size: clamp(26px, 3.2vw, 36px); line-height: 1.18; letter-spacing: -0.025em; }
.golden-copy p:not(.sponsors-kicker) { max-width: 60ch; margin: 14px 0 0; color: #574b33; }
.golden-copy .sponsors-button { margin-top: 22px; }
.golden-button { background: var(--gold-deep); }
.golden-button:hover { background: #412b00; }

/* flagship banner card */

.flagship-sponsor {
  display: grid;
  grid-template-columns:minmax(230px, 300px) minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
  padding: clamp(28px, 4vw, 48px);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.flagship-mark { display: grid; place-items: center; }
.flagship-mark img { max-width: 100%; height: auto; }

.flagship-copy h3 { margin: 6px 0 0; font-size: 22px; font-weight: 650; letter-spacing: -0.01em; }
.flagship-copy p { margin: 10px 0 0; color: var(--muted); font-size: 15px; max-width: 58ch; }
.flagship-copy a { display: inline-block; margin-top: 16px; font-size: 15px; }

/* three large Flagship placements; the Golden tier is intentionally separate */

.flagship-slots { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.flagship-slot {
  min-height: 160px;
  padding: 28px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.flagship-slot-number { color: var(--accent); font-size: 12px; font-weight: 700; letter-spacing: 0.12em; }
.flagship-slot h3 { margin: 42px 0 0; font-size: 19px; letter-spacing: -0.01em; }

/* become-a-sponsor cards */

.sponsor-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }

.sponsor-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 30px 28px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.sponsor-card h3 { margin: 0; font-size: 20px; font-weight: 600; letter-spacing: -0.01em; }
.sponsor-card p { margin: 8px 0 0; color: var(--muted); font-size: 14px; flex: 1; }
.sponsor-card .sponsors-button { margin-top: 20px; }

.sponsors-note { margin: 18px 0 0; color: var(--muted); font-size: 13px; }

/* FAQ */

.faq-list { display: grid; gap: 12px; }
.faq-list details {
  padding: 18px 22px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.faq-list summary {
  cursor: pointer;
  font-size: 15.5px;
  font-weight: 600;
  list-style: none;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; float: right; color: var(--muted); font-size: 18px; line-height: 1; }
.faq-list details[open] summary::after { content: "–"; }
.faq-list details p { margin: 10px 0 0; color: var(--muted); font-size: 14.5px; }

/* ---------- footer ---------- */

.site-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  padding: 22px max(22px, calc((100vw - 980px) / 2));
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12.5px;
}
.site-footer nav { display: flex; gap: 18px; margin-left: auto; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--ink); }

/* ---------- language toggle ---------- */

.sponsors-body .site-language-toggle { border-color: var(--line); background: rgba(255, 255, 255, 0.7); }
.sponsors-body .site-language-toggle button { color: var(--muted); }
.sponsors-body .site-language-toggle button[aria-pressed="true"] { background: var(--ink); color: #fff; }

/* ---------- responsive ---------- */

@media (max-width: 860px) {
  .golden-sponsor { grid-template-columns: minmax(150px, 190px) minmax(0, 1fr); }
  .flagship-sponsor { grid-template-columns: minmax(230px, 1fr); text-align: left; }
  .flagship-slots { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .sponsor-grid { grid-template-columns: 1fr; }
  .site-nav { gap: 20px; overflow-x: auto; }
}

@media (max-width: 680px) {
  .sponsors-main { width: calc(100% - 32px); }
  .golden-sponsor { grid-template-columns: 1fr; }
  .golden-mark { width: min(190px, 70vw); }
  .flagship-slots { grid-template-columns: 1fr; }
  .flagship-slot { min-height: 0; }
  .flagship-slot h3 { margin-top: 32px; }
  .site-nav { padding: 0 16px; }
  .site-footer { padding: 20px 16px; }
}