/* app.css — modern, mobil öncelikli, koyu/açık tema */
:root {
  --bg: #0f172a; --bg2: #1e293b; --card: #1e293b; --card2: #273449;
  --txt: #e2e8f0; --muted: #94a3b8; --line: #334155;
  --accent: #6366f1; --accent2: #818cf8;
  --good: #10b981; --warn: #f59e0b; --bad: #ef4444; --hard: #f97316;
  --radius: 16px; --shadow: 0 6px 24px rgba(0,0,0,.35);
}
:root[data-theme="light"] {
  --bg: #f1f5f9; --bg2: #fff; --card: #fff; --card2: #f8fafc;
  --txt: #0f172a; --muted: #64748b; --line: #e2e8f0; --shadow: 0 6px 20px rgba(2,6,23,.08);
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg); color: var(--txt);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.5; min-height: 100vh; padding-bottom: 76px;
}

/* Üst bar */
.topbar {
  position: sticky; top: 0; z-index: 20; display: flex; align-items: center;
  justify-content: space-between; gap: 12px; padding: 12px 16px;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line);
  padding-top: max(12px, env(safe-area-inset-top));
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand .logo { font-size: 26px; }
.brand strong { display: block; font-size: 16px; }
.brand small { color: var(--muted); font-size: 11px; }
.icon-btn {
  background: var(--card); border: 1px solid var(--line); color: var(--txt);
  border-radius: 12px; width: 40px; height: 40px; font-size: 18px; cursor: pointer;
}

/* Görünüm konteyneri */
.view { max-width: 760px; margin: 0 auto; padding: 16px; }

/* Kartlar / paneller */
.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px; box-shadow: var(--shadow); }
.panel + .panel { margin-top: 14px; }
h2.section { font-size: 14px; text-transform: uppercase; letter-spacing: .5px;
  color: var(--muted); margin: 4px 2px 12px; }

/* İstatistik kutuları */
.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px; }
.stat .num { font-size: 30px; font-weight: 700; line-height: 1; }
.stat .lbl { color: var(--muted); font-size: 12px; margin-top: 6px; }
.stat.due .num { color: var(--accent2); }
.stat.streak .num { color: var(--warn); }
.stat.done .num { color: var(--good); }

/* Butonlar */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--accent); color: #fff; border: none; border-radius: 12px;
  padding: 12px 18px; font-size: 15px; font-weight: 600; cursor: pointer; width: 100%; }
.btn:active { transform: translateY(1px); }
.btn.secondary { background: var(--card2); color: var(--txt); border: 1px solid var(--line); }
.btn.ghost { background: transparent; color: var(--accent2); border: 1px solid var(--line); }
.btn.sm { width: auto; padding: 8px 14px; font-size: 13px; }
.btn-row { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.btn-row .btn { width: auto; flex: 1; }

/* Deste listesi */
.deck { display: flex; align-items: center; gap: 12px; padding: 14px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  margin-bottom: 10px; cursor: pointer; }
.deck:active { background: var(--card2); }
.deck .dot { width: 12px; height: 12px; border-radius: 50%; flex: 0 0 auto; }
.deck .meta { flex: 1; min-width: 0; }
.deck .meta strong { display: block; }
.deck .meta small { color: var(--muted); }
.deck .badge { background: var(--card2); border: 1px solid var(--line); color: var(--accent2);
  border-radius: 999px; padding: 4px 10px; font-size: 12px; font-weight: 700; }

/* Çalışma seansı */
.study-wrap { max-width: 620px; margin: 0 auto; }
.progress { height: 6px; background: var(--card2); border-radius: 999px; overflow: hidden; margin-bottom: 16px; }
.progress > i { display: block; height: 100%; background: var(--accent); transition: width .3s; }
.flashcard { background: var(--card); border: 1px solid var(--line); border-radius: 20px;
  padding: 28px 22px; min-height: 220px; box-shadow: var(--shadow); display: flex;
  flex-direction: column; justify-content: center; text-align: center; font-size: 20px; }
.flashcard .front { font-weight: 600; }
.flashcard hr { border: none; border-top: 1px dashed var(--line); width: 100%; margin: 20px 0; }
.flashcard .back { font-size: 18px; color: var(--txt); }
.flashcard .tags { margin-top: 16px; }
.flashcard .cloze { color: var(--accent2); font-weight: 700; }
.tag { display: inline-block; background: var(--card2); border: 1px solid var(--line);
  color: var(--muted); border-radius: 999px; padding: 2px 10px; font-size: 11px; margin: 2px; }
.grade-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 16px; }
.grade { border: none; border-radius: 12px; padding: 12px 6px; color: #fff; cursor: pointer;
  font-weight: 700; font-size: 14px; }
.grade small { display: block; font-weight: 500; font-size: 11px; opacity: .85; margin-top: 3px; }
.grade.again { background: var(--bad); } .grade.hard { background: var(--hard); }
.grade.good { background: var(--good); } .grade.easy { background: var(--accent); }
.reveal-btn { margin-top: 16px; }
.empty { text-align: center; color: var(--muted); padding: 40px 16px; }
.empty .big { font-size: 44px; }

/* Formlar */
label.field { display: block; margin-bottom: 12px; font-size: 13px; color: var(--muted); }
label.field span { display: block; margin-bottom: 6px; }
input, textarea, select {
  width: 100%; background: var(--bg2); border: 1px solid var(--line); color: var(--txt);
  border-radius: 10px; padding: 11px 12px; font-size: 15px; font-family: inherit; }
textarea { min-height: 90px; resize: vertical; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* Kart listesi (deste detay) */
.cardrow { background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 12px 14px; margin-bottom: 8px; display: flex; gap: 10px; align-items: flex-start; }
.cardrow .c-front { flex: 1; font-size: 14px; }
.cardrow .c-actions { display: flex; gap: 6px; }
.mini { background: var(--card2); border: 1px solid var(--line); color: var(--muted);
  border-radius: 8px; padding: 5px 9px; cursor: pointer; font-size: 13px; }
.back-link { color: var(--accent2); cursor: pointer; font-size: 14px; margin-bottom: 12px;
  display: inline-block; }

/* Alt sekmeler */
.tabbar { position: fixed; bottom: 0; left: 0; right: 0; z-index: 20; display: flex;
  background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(10px);
  border-top: 1px solid var(--line); padding-bottom: env(safe-area-inset-bottom); }
.tab { flex: 1; background: none; border: none; color: var(--muted); padding: 10px 4px 12px;
  font-size: 11px; cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 3px; }
.tab span { font-size: 20px; }
.tab.active { color: var(--accent2); }

/* Toast */
.toast { position: fixed; left: 50%; bottom: 86px; transform: translateX(-50%) translateY(20px);
  background: var(--card2); color: var(--txt); border: 1px solid var(--line); box-shadow: var(--shadow);
  padding: 12px 18px; border-radius: 12px; font-size: 14px; opacity: 0; pointer-events: none;
  transition: .25s; z-index: 30; max-width: 90vw; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.note { background: color-mix(in srgb, var(--warn) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--warn) 40%, transparent); color: var(--txt);
  border-radius: 12px; padding: 12px 14px; font-size: 13px; margin-bottom: 14px; }
.hint { color: var(--muted); font-size: 12px; margin-top: 8px; }
kbd { background: var(--card2); border: 1px solid var(--line); border-bottom-width: 2px;
  border-radius: 6px; padding: 1px 6px; font-size: 12px; }