/* Düzenli Matematik Ödev — ortak stil
   Düzen: tek sütun, telefon öncelikli; panel geniş ekranda iki sütuna açılır.
   Renk: logodaki lacivert-mavi vurgu, maviye çalan nötrler. */
:root {
  --bg: #f3f5fa;
  --card: #ffffff;
  --ink: #17203a;
  --ink-2: #4a5670;
  --ink-3: #7a849a;
  --line: #d9dfeb;
  --accent: #1d4fc4;
  --accent-ink: #ffffff;
  --accent-soft: #e6edfc;
  --ok: #2f7d32; --ok-soft: #e6f3e4;
  --bad: #b3361f; --bad-soft: #fbe9e4;
  --warn: #8a5a00; --warn-soft: #fbf0d6;
  --info: #1f5fa8; --info-soft: #e5eef9;
  --f-display: "Lexend", "Segoe UI", system-ui, sans-serif;
  --f-body: "Atkinson Hyperlegible", "Segoe UI", system-ui, sans-serif;
  --r: 10px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e121b; --card: #171d2a; --ink: #e9edf6; --ink-2: #aab3c7; --ink-3: #7b859b; --line: #283247;
    --accent: #7fb2ff; --accent-ink: #0c2367; --accent-soft: #1b2b52;
    --ok: #7cc97f; --ok-soft: #1c3320; --bad: #f08a72; --bad-soft: #3a1f19; --warn: #e8b54d; --warn-soft: #362a12; --info: #8db8ec; --info-soft: #182a40;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0e121b; --card: #171d2a; --ink: #e9edf6; --ink-2: #aab3c7; --ink-3: #7b859b; --line: #283247;
  --accent: #7fb2ff; --accent-ink: #0c2367; --accent-soft: #1b2b52;
  --ok: #7cc97f; --ok-soft: #1c3320; --bad: #f08a72; --bad-soft: #3a1f19; --warn: #e8b54d; --warn-soft: #362a12; --info: #8db8ec; --info-soft: #182a40;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--f-body); font-size: 16px; line-height: 1.5;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
  padding-block: 12px 40px;
}
h1, h2, h3 { font-family: var(--f-display); font-weight: 600; margin: 0; text-wrap: balance; }
h1 { font-size: 1.35rem; } h2 { font-size: 1.1rem; } h3 { font-size: 1rem; }
.wrap { max-width: 560px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 14px 16px; }
.muted { color: var(--ink-2); } .faint { color: var(--ink-3); font-size: .85rem; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.between { justify-content: space-between; }
.stack { display: flex; flex-direction: column; gap: 10px; }
.grid2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.num { font-variant-numeric: tabular-nums; }
label { font-size: .85rem; color: var(--ink-2); display: block; margin-bottom: 4px; }
input, select, textarea {
  width: 100%; font: inherit; color: var(--ink); background: var(--card);
  border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; min-height: 44px;
}
textarea { min-height: 120px; resize: vertical; }
input:focus-visible, select:focus-visible, textarea:focus-visible, button:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button, .btn {
  font: inherit; font-weight: 600; cursor: pointer; border-radius: 8px; min-height: 44px; padding: 8px 16px;
  border: 1px solid var(--line); background: var(--card); color: var(--ink); text-decoration: none;
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
}
button:hover, .btn:hover { border-color: var(--ink-3); }
button.primary, .btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
button.ghost { border-color: transparent; background: transparent; color: var(--ink-2); }
button.small, .btn.small { min-height: 34px; padding: 4px 12px; font-size: .85rem; }
button:active { transform: scale(.98); }
.full { width: 100%; }
.pill { display: inline-block; font-size: .78rem; font-weight: 600; padding: 2px 10px; border-radius: 99px; white-space: nowrap; }
.p-ok { background: var(--ok-soft); color: var(--ok); } .p-bad { background: var(--bad-soft); color: var(--bad); }
.p-warn { background: var(--warn-soft); color: var(--warn); } .p-info { background: var(--info-soft); color: var(--info); }
.p-acc { background: var(--accent-soft); color: var(--accent); } .p-mute { background: var(--bg); color: var(--ink-3); border: 1px solid var(--line); }
.err { color: var(--bad); font-size: .88rem; min-height: 1.2em; }
.banner { background: var(--warn-soft); color: var(--warn); border-radius: var(--r); padding: 10px 14px; font-size: .88rem; }
.list > * { border-top: 1px solid var(--line); padding: 10px 0; }
.list > *:first-child { border-top: 0; }
.bar { height: 8px; background: var(--bg); border-radius: 4px; overflow: hidden; }
.bar > i { display: block; height: 100%; border-radius: 4px; }
.stat { background: var(--bg); border-radius: 8px; padding: 10px 12px; }
.stat b { display: block; font-family: var(--f-display); font-size: 1.4rem; font-weight: 600; font-variant-numeric: tabular-nums; }
.stat span { font-size: .8rem; color: var(--ink-2); }
.brand { display: flex; align-items: center; gap: 10px; }
.logo { width: 38px; height: 38px; border-radius: 9px; flex: none; display: block; }
.qimg { width: 100%; max-width: 100%; border-radius: 8px; border: 1px solid var(--line); background: #fff; display: block; }
.opts { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 8px; }
.opts button { font-family: var(--f-display); font-size: 1.15rem; min-height: 54px; padding: 0; }
.opts button.sel-ok { background: var(--ok-soft); border-color: var(--ok); color: var(--ok); }
.opts button.sel-bad { background: var(--bad-soft); border-color: var(--bad); color: var(--bad); }
.opts button.right { border-color: var(--ok); border-width: 2px; }
.tabs { display: flex; gap: 4px; background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 4px; overflow-x: auto; }
.tabs button { min-height: 38px; border: 0; background: transparent; color: var(--ink-2); font-size: .9rem; padding: 4px 12px; flex: none; }
.tabs button.on { background: var(--accent-soft); color: var(--accent); }
.modal-back { position: fixed; inset: 0; background: rgba(10, 14, 26, .5); display: flex; align-items: flex-end; justify-content: center; z-index: 50; padding: 12px; padding-bottom: max(12px, env(safe-area-inset-bottom, 0px)); }
.modal { background: var(--card); color: var(--ink); border-radius: 14px; width: 100%; max-width: 560px; max-height: 88vh; overflow: auto; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
@media (min-width: 700px) { .modal-back { align-items: center; } }
@media (prefers-reduced-motion: no-preference) { .fade { animation: fade .25s ease-out; } @keyframes fade { from { opacity: .4; transform: translateY(4px); } to { opacity: 1; transform: none; } } }