/* Sumi Mahjong landing styles · neutral palette · re-theme via CSS vars */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Noto+Serif+SC:wght@400;500;600;700&display=swap');

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

:root {
  --paper:      #FAFAF8;
  --paper-2:    #F2EFE9;
  --paper-3:    #E8E3D8;
  --ink:        #1F1E1B;
  --ink-2:      #3A3833;
  --muted:      #76726A;
  --line:       rgba(31, 30, 27, 0.12);
  --accent:     #1F6FEB;
  --accent-dark:#0A5DD0;
  --surface:    rgba(255,255,255,0.62);
  --surface-2:  rgba(255,255,255,0.92);
  --shadow-sm:  0 1px 3px rgba(31,30,27,0.06);
  --shadow-md:  0 4px 18px rgba(31,30,27,0.08);
  --shadow-lg:  0 18px 48px rgba(31,30,27,0.12);
  --radius:     14px;
  --radius-lg:  22px;
  --max-w:      1120px;
  --serif:      'Noto Serif SC', 'Songti SC', 'Songti TC', serif;
  --sans:       'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans', sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:      #18181A;
    --paper-2:    #1F1F22;
    --paper-3:    #25252A;
    --ink:        #ECECEE;
    --ink-2:      #C8C8CB;
    --muted:      #8E8E93;
    --line:       rgba(255,255,255,0.10);
    --surface:    rgba(36,36,40,0.62);
    --surface-2:  rgba(36,36,40,0.92);
    --shadow-sm:  none;
    --shadow-md:  none;
    --shadow-lg:  none;
  }
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(circle at 50% -10%, var(--paper-2) 0%, transparent 60%),
    linear-gradient(180deg, var(--paper) 0%, var(--paper-2) 55%, var(--paper-3) 100%);
  background-attachment: fixed;
  min-height: 100vh;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent-dark); text-decoration: none; }
a:hover { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }

/* ---- Nav ---- */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.nav-inner { max-width: var(--max-w); margin: 0 auto; padding: 14px 22px; display: flex; align-items: center; gap: 18px; }
.nav-brand { display: flex; align-items: center; gap: 10px; font-weight: 600; color: var(--ink); }
.nav-brand img { width: 30px; height: 30px; border-radius: 7px; box-shadow: var(--shadow-sm); }
.nav-brand .name-cn { font-family: var(--serif); font-size: 18px; }
.nav-brand .name-en { font-size: 13px; color: var(--muted); margin-left: 4px; }
.nav-links { margin-left: auto; display: flex; gap: 22px; align-items: center; }
.nav-links a { color: var(--ink-2); font-size: 14px; font-weight: 500; }
.nav-links a:hover { color: var(--accent-dark); text-decoration: none; }
@media (max-width: 720px) { .nav-links a:not(.btn) { display: none; } }

/* ---- Layout ---- */
.section { max-width: var(--max-w); margin: 0 auto; padding: 80px 22px; }
.section-narrow { max-width: 760px; padding: 60px 22px; }
.divider { max-width: var(--max-w); margin: 0 auto; padding: 0 22px; }
.divider::after { content: ""; display: block; height: 1px; background: var(--line); }

/* ---- Hero ---- */
.hero { max-width: 920px; margin: 0 auto; padding: 80px 22px 40px; text-align: center; }
.hero-icon { width: 110px; height: 110px; border-radius: 26px; box-shadow: var(--shadow-md); margin-bottom: 26px; }
.hero h1 { font-size: clamp(34px, 6vw, 58px); font-weight: 700; letter-spacing: -0.01em; line-height: 1.15; margin-bottom: 18px; }
.lede { font-size: 17px; color: var(--ink-2); max-width: 640px; margin: 0 auto; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 30px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 22px; border-radius: 999px; font-weight: 600; font-size: 14px; transition: transform .12s ease, background .12s ease, color .12s ease; }
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn-primary { background: var(--ink); color: var(--paper); border: 1px solid var(--ink); }
.btn-primary:hover { background: var(--ink-2); color: var(--paper); }
.btn-outline { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn-outline:hover { background: var(--surface-2); color: var(--ink); }
.hero-meta { display: flex; flex-wrap: wrap; gap: 18px; justify-content: center; margin-top: 26px; color: var(--muted); font-size: 13px; }
.hero-meta span::before { content: "·"; margin-right: 18px; color: var(--line); }
.hero-meta span:first-child::before { display: none; }

/* ---- Hero posters ---- */
.hero-posters { max-width: var(--max-w); margin: 30px auto 0; padding: 0 22px; display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; }
.hero-poster { background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; box-shadow: var(--shadow-sm); }
.hero-poster img { width: 100%; height: auto; border-radius: 8px; display: block; }

/* ---- Eyebrow / titles ---- */
.eyebrow { text-transform: uppercase; letter-spacing: 0.14em; font-size: 12px; font-weight: 700; color: var(--accent-dark); margin-bottom: 12px; }
h2 { font-size: clamp(26px, 4vw, 38px); font-weight: 700; letter-spacing: -0.01em; margin-bottom: 14px; }

/* ---- Features grid ---- */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; margin-top: 30px; }
.feature { background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-sm); }
.feature-glyph { width: 44px; height: 44px; border-radius: 12px; background: var(--paper-3); color: var(--ink); display: grid; place-items: center; font-family: var(--serif); font-size: 20px; font-weight: 600; margin-bottom: 14px; }
.feature h3 { font-size: 17px; font-weight: 600; margin-bottom: 6px; }
.feature p { color: var(--ink-2); font-size: 14px; }

/* ---- Lang strip ---- */
.lang-strip { max-width: var(--max-w); margin: 0 auto; padding: 24px 22px; display: flex; align-items: center; gap: 18px; }
.lang-strip-label { color: var(--muted); font-size: 13px; }
.lang-list { display: flex; flex-wrap: wrap; gap: 10px; }
.lang-list span { padding: 4px 10px; background: var(--surface-2); border: 1px solid var(--line); border-radius: 999px; font-size: 13px; }

/* ---- CTA ---- */
.cta-section { max-width: 860px; margin: 0 auto; padding: 100px 22px; text-align: center; }

/* ---- Footer ---- */
footer { border-top: 1px solid var(--line); margin-top: 40px; padding: 50px 22px 30px; background: var(--surface); }
.foot-inner { max-width: var(--max-w); margin: 0 auto; display: flex; flex-wrap: wrap; gap: 36px; justify-content: space-between; }
.foot-brand { display: flex; align-items: center; gap: 12px; font-weight: 600; font-size: 15px; }
.foot-brand img { width: 36px; height: 36px; border-radius: 8px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 36px; }
.foot-col { display: flex; flex-direction: column; gap: 6px; }
.foot-col-title { text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted); font-size: 11px; font-weight: 700; margin-bottom: 4px; }
.foot-col a { color: var(--ink-2); font-size: 13px; }
.foot-bottom { max-width: var(--max-w); margin: 40px auto 0; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; color: var(--muted); font-size: 12px; }

/* ---- Legal page (privacy / terms) ---- */
.legal-page { max-width: 760px; margin: 0 auto; padding: 60px 22px 100px; }
.legal-page .back-link { display: inline-block; margin-bottom: 22px; color: var(--accent-dark); font-size: 14px; }
.legal-page h1 { font-size: 34px; font-weight: 700; margin-bottom: 6px; }
.legal-page .updated { color: var(--muted); font-size: 13px; margin-bottom: 30px; }
.legal-page h2 { font-size: 22px; margin: 30px 0 12px; }
.legal-page h3 { font-size: 16px; margin: 22px 0 8px; }
.legal-page p, .legal-page li { color: var(--ink-2); font-size: 15px; margin-bottom: 12px; line-height: 1.7; }
.legal-page ul, .legal-page ol { padding-left: 22px; }
.legal-page table { width: 100%; border-collapse: collapse; margin: 14px 0 18px; font-size: 14px; }
.legal-page th, .legal-page td { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.legal-page th { color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; }
.legal-page code { background: var(--paper-3); padding: 1px 6px; border-radius: 4px; font-size: 12px; }

/* ---- Lang dropdown ---- */
.lang-dropdown { position: relative; }
.lang-dropdown-trigger { display: inline-flex; align-items: center; gap: 6px; background: transparent; border: 1px solid var(--line); border-radius: 999px; padding: 6px 12px; font: inherit; font-size: 13px; color: var(--ink-2); cursor: pointer; }
.lang-dropdown-trigger:hover { background: var(--surface-2); color: var(--ink); }
.lang-dropdown-trigger .caret { font-size: 11px; color: var(--muted); }
.lang-dropdown-menu { position: absolute; right: 0; top: calc(100% + 8px); background: var(--surface-2); border: 1px solid var(--line); border-radius: 10px; box-shadow: var(--shadow-md); min-width: 140px; padding: 6px; display: none; flex-direction: column; gap: 2px; z-index: 100; }
.lang-dropdown-menu.open { display: flex; }
.lang-dropdown-item { background: transparent; border: 0; color: var(--ink-2); text-align: left; padding: 7px 10px; border-radius: 7px; font: inherit; font-size: 13px; cursor: pointer; }
.lang-dropdown-item:hover, .lang-dropdown-item.active { background: var(--paper-3); color: var(--ink); }