/* VisualMem — visualmem.com */
* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg0: #05070f;
  --bg1: #0a1024;
  --panel: rgba(255,255,255,.045);
  --panel-edge: rgba(255,255,255,.10);
  --text: #eef2ff;
  --muted: #9aa7c7;
  --cyan: #38bdf8;
  --indigo: #818cf8;
  --pink: #f472b6;
  --amber: #fbbf24;
  --yt: #ff0033;
  --radius: 20px;
  --font-d: "Sora", "Hiragino Sans", "Yu Gothic", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  --font-b: "Inter", "Hiragino Sans", "Yu Gothic", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
}

html { scroll-behavior: smooth; }
html, body { overflow-x: clip; }

body {
  font-family: var(--font-b);
  color: var(--text);
  background:
    radial-gradient(1200px 700px at 85% -10%, rgba(129,140,248,.16), transparent 60%),
    radial-gradient(900px 600px at -10% 30%, rgba(56,189,248,.10), transparent 55%),
    radial-gradient(700px 500px at 60% 110%, rgba(244,114,182,.07), transparent 60%),
    linear-gradient(180deg, var(--bg0), var(--bg1) 60%, var(--bg0));
  background-attachment: fixed;
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* faint starfield */
body::before {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    radial-gradient(1.2px 1.2px at 12% 22%, rgba(255,255,255,.5), transparent 100%),
    radial-gradient(1px 1px at 78% 12%, rgba(255,255,255,.4), transparent 100%),
    radial-gradient(1.4px 1.4px at 55% 45%, rgba(255,255,255,.35), transparent 100%),
    radial-gradient(1px 1px at 30% 78%, rgba(255,255,255,.3), transparent 100%),
    radial-gradient(1.2px 1.2px at 92% 62%, rgba(255,255,255,.4), transparent 100%),
    radial-gradient(1px 1px at 5% 55%, rgba(255,255,255,.35), transparent 100%);
}

main, footer { position: relative; z-index: 1; }
/* header en üstte: dil menüsü hero'daki karta gömülmesin */
header { position: relative; z-index: 100; }

h1, h2, h3, .brand-name { font-family: var(--font-d); }

/* ---------- nav ---------- */
.nav {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1160px; margin: 0 auto; padding: 20px 24px;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.brand-mark { filter: drop-shadow(0 2px 10px rgba(56,189,248,.35)); }
.brand-name { font-size: 1.3rem; font-weight: 800; letter-spacing: -.02em; }
.brand-name em, .foot-brand em { font-style: normal; color: var(--cyan); }
.nav-right { display: flex; align-items: center; gap: 12px; }

/* dil kodu rozeti — emoji bayraklar Windows'ta renkli render edilmediği için */
.chip {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 30px; height: 22px; padding: 0 5px; border-radius: 6px;
  font: 700 .66rem var(--font-b); letter-spacing: .06em; color: #cfe4ff;
  background: linear-gradient(135deg, rgba(56,189,248,.22), rgba(129,140,248,.22));
  border: 1px solid rgba(139,180,248,.35);
}
.chip-lg { min-width: 40px; height: 28px; font-size: .78rem; border-radius: 8px; }

.langpick { position: relative; }
.langpick-btn {
  font: 500 .9rem var(--font-b); color: var(--text);
  background: var(--panel); border: 1px solid var(--panel-edge); border-radius: 999px;
  padding: 8px 14px; cursor: pointer;
}
.langpick-btn:hover { border-color: rgba(255,255,255,.25); }
.langpick-menu {
  position: absolute; right: 0; top: calc(100% + 8px); min-width: 200px;
  background: #0d1430; border: 1px solid var(--panel-edge); border-radius: 14px;
  padding: 6px; display: none; z-index: 50;
  box-shadow: 0 16px 48px rgba(0,0,0,.5);
  max-height: 70vh; overflow-y: auto;
}
.langpick-menu.open { display: block; }
.langpick-menu a {
  display: flex; gap: 10px; align-items: center; padding: 8px 12px; border-radius: 9px;
  color: var(--text); text-decoration: none; font-size: .92rem; white-space: nowrap;
}
.langpick-menu a:hover { background: rgba(255,255,255,.07); }
.langpick-menu a.cur { background: rgba(56,189,248,.12); color: var(--cyan); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  font: 600 1rem var(--font-b); text-decoration: none;
  padding: 13px 22px; border-radius: 999px; transition: transform .15s, box-shadow .15s;
}
.btn:hover { transform: translateY(-2px); }
.btn-yt { background: var(--yt); color: #fff; box-shadow: 0 6px 24px rgba(255,0,51,.35); }
.btn-yt:hover { box-shadow: 0 10px 32px rgba(255,0,51,.5); }
.btn-nav { padding: 9px 16px; font-size: .9rem; }
.btn-ghost {
  background: var(--panel); border: 1px solid var(--panel-edge); color: var(--muted);
  cursor: default;
}

/* ---------- hero ---------- */
.hero {
  max-width: 1160px; margin: 0 auto; padding: 56px 24px 80px;
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 56px; align-items: center;
}
.kicker {
  color: var(--cyan); font-weight: 600; letter-spacing: .14em; text-transform: uppercase;
  font-size: .82rem; margin-bottom: 14px;
}
.hero h1 {
  font-size: clamp(2.4rem, 5.4vw, 3.9rem); line-height: 1.08; font-weight: 800;
  letter-spacing: -.03em; margin-bottom: 20px;
  background: linear-gradient(92deg, #fff 30%, var(--cyan) 75%, var(--indigo));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .sub { color: var(--muted); font-size: 1.13rem; max-width: 34em; margin-bottom: 30px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.demo-hint { margin-top: 26px; color: var(--muted); font-size: .88rem; opacity: .85; }

/* ---------- flashcard demo ---------- */
.card-demo {
  background: linear-gradient(165deg, rgba(255,255,255,.08), rgba(255,255,255,.03));
  border: 1px solid var(--panel-edge); border-radius: 26px; padding: 18px;
  box-shadow: 0 30px 80px rgba(0,0,0,.5), 0 0 0 1px rgba(56,189,248,.06), 0 0 60px rgba(56,189,248,.07);
  max-width: min(400px, 100%); justify-self: center; width: 100%;
  backdrop-filter: blur(12px);
}
/* minmax(0,1fr): 1fr'nin min-content'i görselin gerçek genişliğine şişmesin (mobil taşma) */
.card-imgs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.card-imgs img {
  width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: 13px; display: block;
  border: 1px solid rgba(255,255,255,.07);
}
.card-word { display: flex; align-items: baseline; gap: 12px; padding: 16px 6px 4px; flex-wrap: wrap; }
.word-main { font-family: var(--font-d); font-size: 2rem; font-weight: 700; letter-spacing: -.02em; }
.word-phon { color: var(--cyan); font-size: 1rem; }
.cefr {
  margin-left: auto; font-size: .72rem; font-weight: 700; color: #052033;
  background: var(--cyan); border-radius: 7px; padding: 3px 8px; letter-spacing: .05em;
}
.card-speeds { display: flex; gap: 8px; padding: 10px 2px; }
.speed {
  flex: 1; font: 600 .88rem var(--font-b); color: var(--text);
  background: rgba(255,255,255,.06); border: 1px solid var(--panel-edge);
  border-radius: 11px; padding: 10px 6px; cursor: pointer; transition: all .15s;
}
.speed:hover { background: rgba(56,189,248,.14); border-color: rgba(56,189,248,.4); }
.speed-active { background: rgba(56,189,248,.2); border-color: var(--cyan); color: var(--cyan); }
.speed.playing { animation: pulse .9s ease-in-out infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 5px rgba(56,189,248,.15); } }
.card-langs { display: flex; gap: 6px; flex-wrap: wrap; padding: 8px 2px 2px; justify-content: center; }
.card-langs button {
  min-width: 36px; height: 26px; font: 700 .7rem var(--font-b); letter-spacing: .06em;
  color: var(--muted); background: rgba(255,255,255,.05);
  border: 1px solid var(--panel-edge); border-radius: 8px;
  cursor: pointer; transition: all .12s;
}
.card-langs button:hover { background: rgba(56,189,248,.12); color: var(--text); }
.card-langs button.cur { border-color: var(--cyan); background: rgba(56,189,248,.18); color: var(--cyan); }

/* ---------- sections ---------- */
section h2 {
  font-size: clamp(1.7rem, 3.4vw, 2.4rem); font-weight: 800; letter-spacing: -.02em;
  text-align: center; margin-bottom: 12px;
}
.section-sub { color: var(--muted); text-align: center; max-width: 44em; margin: 0 auto 44px; }

.how { max-width: 1160px; margin: 0 auto; padding: 60px 24px; }
.features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.feature {
  background: var(--panel); border: 1px solid var(--panel-edge); border-radius: var(--radius);
  padding: 26px 22px; transition: transform .18s, border-color .18s;
}
.feature:hover { transform: translateY(-4px); border-color: rgba(56,189,248,.35); }
.f-ico { font-size: 1.9rem; margin-bottom: 14px; }
.feature h3 { font-size: 1.06rem; font-weight: 700; margin-bottom: 9px; }
.feature p { color: var(--muted); font-size: .93rem; }

.stats {
  max-width: 1160px; margin: 20px auto; padding: 34px 24px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
  border-top: 1px solid rgba(255,255,255,.07); border-bottom: 1px solid rgba(255,255,255,.07);
}
.stat { text-align: center; }
.stat b {
  display: block; font-family: var(--font-d); font-size: clamp(1.7rem, 3.6vw, 2.5rem);
  font-weight: 800; letter-spacing: -.02em;
  background: linear-gradient(92deg, var(--cyan), var(--indigo));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat span { color: var(--muted); font-size: .9rem; }

.channels { max-width: 1160px; margin: 0 auto; padding: 70px 24px; }
.ch-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.ch-card {
  display: flex; align-items: center; gap: 14px; text-decoration: none; color: var(--text);
  background: var(--panel); border: 1px solid var(--panel-edge); border-radius: 16px;
  padding: 16px 18px; transition: transform .15s, border-color .15s, background .15s;
}
.ch-card:hover { transform: translateY(-3px); border-color: rgba(255,0,51,.5); background: rgba(255,0,51,.05); }
.ch-card b { display: block; font-size: 1rem; }
.ch-card span { color: var(--muted); font-size: .82rem; }
.ch-go { margin-left: auto; color: var(--muted); font-size: .82rem; display: flex; align-items: center; gap: 6px; white-space: nowrap; }
.ch-card:hover .ch-go { color: var(--yt); }

.about { max-width: 780px; margin: 0 auto; padding: 40px 24px 90px; }
.about p { color: var(--muted); margin-bottom: 16px; }

/* ---------- footer ---------- */
footer { border-top: 1px solid rgba(255,255,255,.07); background: rgba(0,0,0,.25); }
.foot-inner { max-width: 1160px; margin: 0 auto; padding: 40px 24px; text-align: center; }
.foot-brand {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-d); font-weight: 800; font-size: 1.05rem; margin-bottom: 14px;
}
.foot-note { color: var(--muted); font-size: .85rem; max-width: 40em; margin: 0 auto 18px; }
.foot-links { display: flex; gap: 26px; justify-content: center; margin-bottom: 16px; }
.foot-links a { color: var(--text); text-decoration: none; font-size: .92rem; opacity: .85; }
.foot-links a:hover { color: var(--cyan); opacity: 1; }
.foot-copy { color: var(--muted); font-size: .8rem; opacity: .7; }

/* ---------- privacy page ---------- */
.legal { max-width: 760px; margin: 0 auto; padding: 40px 24px 90px; }
.legal h1 { font-size: 2rem; margin-bottom: 6px; }
.legal .updated { color: var(--muted); font-size: .88rem; margin-bottom: 34px; }
.legal h2 { font-size: 1.2rem; text-align: left; margin: 30px 0 10px; }
.legal p, .legal li { color: var(--muted); font-size: .96rem; }
.legal ul { padding-left: 22px; margin: 10px 0; }
.legal a { color: var(--cyan); }

/* ---------- responsive ---------- */
@media (max-width: 920px) {
  .hero { grid-template-columns: 1fr; padding-top: 30px; gap: 44px; }
  .features { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); row-gap: 28px; }
}
@media (max-width: 560px) {
  .features { grid-template-columns: 1fr; }
  .nav { padding: 14px 16px; }
  .langpick-btn span { display: none; }
  .btn-nav { display: none; }
}