/*
 * AZ-700 Exam Trainer - single stylesheet, mobile-first.
 *
 * One breakpoint (768px) separates "phone" from "everything wider". Below it,
 * result tables collapse into stacked cards and the exam action bar sticks to
 * the bottom of the viewport, because scrolling a six-thousand-pixel-tall
 * question image back down to reach a grading button is not acceptable.
 */

:root {
  --bg: #f7f6f3;
  --surface: #ffffff;
  --text: #1f2420;
  --muted: #6b665f;
  --border: #ddd8d0;
  --brand: #1c6b4f;
  --brand-dark: #144f3a;
  --good: #1e7d32;
  --good-bg: #e6f4ea;
  --bad: #b3261e;
  --bad-bg: #fbe9e7;
  --warn: #8a6100;
  --warn-bg: #fdf3d9;
  --radius: 10px;
  --gap: 12px;
  --touch: 48px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14171a;
    --surface: #1c2024;
    --text: #eef0ee;
    --muted: #a2a7a0;
    --border: #333a35;
    --brand: #35a37c;
    --brand-dark: #4bbd93;
    --good: #6fce8a;
    --good-bg: #163524;
    --bad: #f28b83;
    --bad-bg: #3a1f1c;
    --warn: #e0bd4e;
    --warn-bg: #3a3018;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.45;
}

a { color: var(--brand-dark); }

h1, h2, h3 { line-height: 1.25; margin: 0 0 8px; }
h1 { font-size: 1.4rem; }
h2 { font-size: 1.15rem; }
h3 { font-size: 1rem; }

p { margin: 0 0 var(--gap); }

.muted { color: var(--muted); }
.good { color: var(--good); }
.bad { color: var(--bad); }
.warn { color: var(--warn); }

/* ---------------------------------------------------------------- layout */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px max(16px, env(safe-area-inset-left));
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar-brand {
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
  color: var(--text);
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px max(16px, env(safe-area-inset-left)) 24px max(16px, env(safe-area-inset-right));
}

.page-wide { max-width: 960px; }

.section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: var(--gap);
}

.row { display: flex; align-items: center; justify-content: space-between; gap: var(--gap); }
.row-wrap { flex-wrap: wrap; }
.stack { display: flex; flex-direction: column; gap: var(--gap); }

/* ---------------------------------------------------------------- alerts */

.alert {
  border-radius: var(--radius);
  padding: 12px 14px;
  margin-bottom: var(--gap);
  border: 1px solid transparent;
}
.alert-error { background: var(--bad-bg); color: var(--bad); border-color: var(--bad); }
.alert-success { background: var(--good-bg); color: var(--good); border-color: var(--good); }
.alert-info { background: var(--warn-bg); color: var(--warn); border-color: var(--warn); }

/* --------------------------------------------------------------- buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--touch);
  padding: 10px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--brand-dark); }

.btn-danger { background: var(--bad); border-color: var(--bad); color: #fff; }
.btn-good { background: var(--good); border-color: var(--good); color: #fff; }
.btn-warn { background: var(--warn); border-color: var(--warn); color: #1f2420; }

.btn-block { display: flex; width: 100%; }
.btn-link {
  background: none; border: none; padding: 4px 8px; color: var(--brand-dark);
  font-weight: 600; cursor: pointer; text-decoration: underline; min-height: auto;
}

.btn-group { display: flex; flex-direction: column; gap: 10px; }
.btn-group-row { display: flex; flex-direction: row; gap: 10px; }
.btn-group-row .btn { flex: 1; }

/* Big vertical menu buttons: the whole tappable area is at least --touch tall
   and full-width, so a thumb on a phone cannot easily miss. */
.menu-list { display: flex; flex-direction: column; gap: 10px; }
.menu-list .btn { min-height: 56px; font-size: 1.05rem; justify-content: flex-start; padding-left: 20px; }

/* --------------------------------------------------------------- forms */

label { display: block; font-weight: 600; margin-bottom: 6px; }

input[type="text"], input[type="number"], select {
  width: 100%;
  min-height: var(--touch);
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
}

.option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 8px;
  font-weight: 500;
  cursor: pointer;
}
.option input[type="radio"], .option input[type="checkbox"] {
  width: 22px; height: 22px; flex: none;
}
.option input[type="number"] { width: 100px; margin-left: auto; }

.field { margin-bottom: 16px; }
.field .hint { font-weight: 400; color: var(--muted); font-size: 0.9rem; margin-top: 4px; }

/* --------------------------------------------------------------- tables */

table.responsive {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
}
table.responsive th, table.responsive td {
  text-align: left;
  padding: 10px 8px;
  border-bottom: 1px solid var(--border);
}
table.responsive th { color: var(--muted); font-weight: 600; font-size: 0.9rem; }
table.responsive tbody tr:hover { background: var(--bg); }

@media (max-width: 768px) {
  table.responsive thead { display: none; }
  table.responsive, table.responsive tbody, table.responsive tr, table.responsive td { display: block; width: 100%; }
  table.responsive tr {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 10px;
    padding: 4px 10px;
  }
  table.responsive td {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border);
    padding: 8px 0;
  }
  table.responsive td:last-child { border-bottom: none; }
  table.responsive td::before {
    content: attr(data-label);
    font-weight: 600;
    color: var(--muted);
  }
}

/* ----------------------------------------------------------------- tabs */

.tabs { display: flex; gap: 6px; margin-bottom: var(--gap); flex-wrap: wrap; }
.tabs a {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  font-size: 0.92rem;
}
.tabs a.active { background: var(--brand); border-color: var(--brand); color: #fff; }

/* ------------------------------------------------------------ exam image */

.image-viewer {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: var(--gap);
}
.image-viewer-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  flex-wrap: wrap;
}
.image-viewer-toolbar .btn { min-height: 40px; padding: 6px 12px; font-weight: 700; }
.image-viewer-zoom { min-width: 48px; text-align: center; color: var(--muted); font-size: 0.9rem; }
.image-viewer-status { margin-left: auto; color: var(--muted); font-size: 0.85rem; }

.image-viewer-scroll {
  overflow: auto;
  max-height: 70vh;
  background: #fff;
  text-align: center;
  touch-action: pan-x pan-y pinch-zoom;
}
.image-viewer-scroll img {
  display: inline-block;
  max-width: none;
  height: auto;
}

/* --------------------------------------------------------- exam layout */

.exam-header { margin-bottom: var(--gap); }
.exam-meta { color: var(--muted); font-size: 0.92rem; }

.exam-flag-form { margin-top: 4px; }

/* Sticky action bar: the reason the whole layout is mobile-first. A question
   image can be six times taller than the screen; the grading buttons must
   never require scrolling to reach. */
.action-bar {
  position: sticky;
  bottom: 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  margin: 0 calc(-1 * max(16px, env(safe-area-inset-left))) 0 calc(-1 * max(16px, env(safe-area-inset-right)));
  padding: 10px max(16px, env(safe-area-inset-left)) calc(10px + env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-right));
}

.grade-buttons { display: flex; gap: 8px; }
.grade-buttons .btn { flex: 1; flex-direction: column; gap: 2px; font-size: 0.95rem; }
.grade-buttons .btn small { font-weight: 400; opacity: 0.85; }

.secondary-actions { display: flex; justify-content: space-between; align-items: center; margin-top: 8px; gap: 8px; }

/* ------------------------------------------------------------- details */

details.answer-row { border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 8px; }
details.answer-row summary {
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-weight: 600;
  min-height: var(--touch);
  align-items: center;
}
details.answer-row summary::-webkit-details-marker { display: none; }
details.answer-row .answer-row-body { padding: 0 14px 14px; }
details.answer-row .answer-row-body img { width: 100%; height: auto; border: 1px solid var(--border); border-radius: 6px; margin-bottom: 8px; }

.badge { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: 0.82rem; font-weight: 700; }
.badge-good { background: var(--good-bg); color: var(--good); }
.badge-bad { background: var(--bad-bg); color: var(--bad); }
.badge-warn { background: var(--warn-bg); color: var(--warn); }

/* ------------------------------------------------------------- desktop */

@media (min-width: 769px) {
  .page { padding-top: 24px; }
  .menu-list { max-width: 420px; }
  .action-bar { margin: 0; border-radius: 0 0 var(--radius) var(--radius); }
}