:root {
  --bg1: #2a0f1e;
  --bg2: #3a1630;
  --accent: #f472b6;
  --accent-2: #f9a8d4;
  --text: #fff7fb;
  --muted: #f3cde0;
  --card: rgba(255, 255, 255, 0.08);
  --ok: #f472b6;
  --bad: #fb7185;
  --shadow: 0 20px 60px rgba(0,0,0,0.35);
}

body[data-interface="light"] {
  --bg1: #f6f8fb;
  --bg2: #eef2f7;
  --accent: #2563eb;
  --accent-2: #0f766e;
  --text: #111827;
  --muted: #5b6472;
  --card: rgba(255, 255, 255, 0.92);
  --ok: #15803d;
  --bad: #b91c1c;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
}

body[data-interface="dark"] {
  --bg1: #161a21;
  --bg2: #202631;
  --accent: #38bdf8;
  --accent-2: #5eead4;
  --text: #f8fafc;
  --muted: #b7c0cc;
  --card: rgba(255, 255, 255, 0.07);
  --ok: #4ade80;
  --bad: #fb7185;
  --shadow: 0 20px 60px rgba(0,0,0,0.3);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 600px at 10% 10%, #5b1d47 0%, transparent 60%),
                  radial-gradient(1000px 800px at 90% 10%, #4a1b3c 0%, transparent 55%),
                  linear-gradient(180deg, var(--bg1), var(--bg2));
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: 32px 16px;
}

body[data-interface="light"] {
  background: linear-gradient(180deg, var(--bg1), var(--bg2));
}

body[data-interface="dark"] {
  background: linear-gradient(180deg, var(--bg1), var(--bg2));
}

.app {
  width: min(1180px, 100%);
  display: grid;
  gap: 24px;
}

header {
  display: grid;
  gap: 8px;
}

.interface-menu {
  position: fixed;
  top: max(18px, env(safe-area-inset-top));
  right: max(18px, calc((100vw - 1180px) / 2 + 18px));
  width: auto;
  z-index: 30;
}

.interface-trigger {
  width: 58px;
  height: 58px;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 12px;
  padding: 0;
  background: rgba(255,255,255,0.1);
  color: var(--text);
  cursor: pointer;
  font: inherit;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 28px rgba(0,0,0,0.16);
  backdrop-filter: blur(14px);
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.interface-trigger:hover,
.interface-menu.open .interface-trigger {
  transform: translateY(-1px);
  border-color: rgba(255,255,255,0.34);
  background: rgba(255,255,255,0.16);
  box-shadow: 0 14px 34px rgba(0,0,0,0.2);
}

.interface-icon {
  width: 27px;
  height: 27px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.interface-menu-list {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 168px;
  max-width: calc(100vw - 28px);
  display: none;
  padding: 8px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255, 226, 240, 0.96);
  box-shadow: 0 16px 42px rgba(0,0,0,0.2);
  backdrop-filter: blur(14px);
  z-index: 31;
}

.interface-menu.open .interface-menu-list {
  display: grid;
  gap: 6px;
}

.interface-option {
  width: 100%;
  border: 0;
  border-radius: 8px;
  padding: 11px 12px;
  background: transparent;
  color: #3b0a26;
  cursor: pointer;
  font: inherit;
  font-size: 1rem;
  font-weight: 750;
  text-align: left;
  letter-spacing: 0;
}

.interface-option:hover,
.interface-option.active {
  color: #3b0a26;
  background: rgba(244, 114, 182, 0.22);
}

.kicker {
  text-transform: uppercase;
  letter-spacing: 0.3em;
  font-size: 0.75rem;
  color: var(--accent-2);
}

h1 {
  font-family: "IBM Plex Serif", "Georgia", serif;
  font-weight: 600;
  margin: 0;
  font-size: clamp(2rem, 2vw + 1.6rem, 3rem);
}

.sub {
  margin: 0;
  color: var(--muted);
  max-width: 60ch;
  line-height: 1.5;
}

.public-context {
  display: block;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.045);
  box-shadow: 0 10px 28px rgba(0,0,0,0.1);
  backdrop-filter: blur(10px);
  overflow: hidden;
}

.public-toggle {
  width: 100%;
  min-height: 50px;
  border: 0;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 12px;
  align-items: center;
  padding: 11px 14px;
  font: inherit;
  text-align: left;
}

.public-toggle-main {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.public-toggle-title {
  font-weight: 800;
  letter-spacing: 0;
}

.public-toggle-meta {
  color: var(--muted);
  font-size: 0.82rem;
}

.public-toggle-action {
  min-width: 68px;
  justify-self: end;
  padding: 5px 9px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.06);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  text-align: center;
}

.public-chevron {
  width: 28px;
  height: 28px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.06);
  color: var(--text);
  display: inline-grid;
  place-items: center;
  transition: transform 0.16s ease, background 0.16s ease, border-color 0.16s ease;
}

.public-chevron svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.public-context.open .public-chevron {
  transform: rotate(180deg);
  border-color: rgba(255,255,255,0.22);
  background: rgba(255,255,255,0.12);
}

.public-info-body {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 14px;
}

.public-info-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(240px, 0.65fr);
  gap: 14px;
  align-items: stretch;
}

.public-info-card {
  min-width: 0;
}

.public-eyebrow {
  margin-bottom: 6px;
  color: var(--accent-2);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.public-copy {
  margin: 0;
  color: var(--text);
  font-size: 0.9rem;
  line-height: 1.55;
}

.public-points {
  margin: 10px 0 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.55;
}

.public-points li + li {
  margin-top: 4px;
}

.public-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.public-tags span {
  padding: 5px 9px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.06);
  color: var(--text);
  font-size: 0.78rem;
  font-weight: 700;
}

.public-note {
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.05);
  color: var(--muted);
  padding: 12px;
  font-size: 0.86rem;
  line-height: 1.55;
}

.public-note p {
  margin: 0;
}

.public-contact {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(255,255,255,0.08);
  color: var(--muted);
  font-size: 0.84rem;
}

.public-contact strong {
  display: block;
  margin-bottom: 4px;
  color: var(--text);
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.contact-links a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.06);
  color: var(--text);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 700;
}

.contact-links a:hover {
  border-color: rgba(255,255,255,0.26);
  background: rgba(255,255,255,0.12);
}

.public-close-row {
  display: flex;
  justify-content: flex-end;
  margin-top: 10px;
}

.public-close {
  width: auto;
}

body[data-interface="secret"] .public-only {
  display: none !important;
}

.panel {
  background: var(--card);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 20px;
  padding: clamp(20px, 4vw, 32px);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

body[data-interface="light"] .panel {
  border-color: rgba(15, 23, 42, 0.08);
  backdrop-filter: none;
}

body[data-interface="light"] .chip,
body[data-interface="light"] .public-context,
body[data-interface="light"] .public-note,
body[data-interface="light"] .public-tags span,
body[data-interface="light"] .public-toggle-action,
body[data-interface="light"] .public-chevron,
body[data-interface="light"] .contact-links a,
body[data-interface="light"] .settings-panel,
body[data-interface="light"] .mode-card,
body[data-interface="light"] .mode-option,
body[data-interface="light"] .answer-btn,
body[data-interface="light"] .review-item,
body[data-interface="light"] .qa-item,
body[data-interface="light"] .qa-option,
body[data-interface="light"] .stat-item,
body[data-interface="light"] .dropdown-trigger,
body[data-interface="light"] .number-input,
body[data-interface="light"] .field input[type="text"],
body[data-interface="light"] .field input[type="url"] {
  border-color: rgba(15, 23, 42, 0.12);
  background: rgba(255, 255, 255, 0.72);
}

body[data-interface="light"] .public-context {
  box-shadow: 0 14px 38px rgba(15, 23, 42, 0.08);
  backdrop-filter: none;
}

body[data-interface="light"] .public-note,
body[data-interface="light"] .public-tags span,
body[data-interface="light"] .public-toggle-action,
body[data-interface="light"] .public-chevron,
body[data-interface="light"] .contact-links a {
  color: var(--text);
}

body[data-interface="light"] .contact-links a:hover {
  border-color: rgba(37, 99, 235, 0.28);
  background: rgba(37, 99, 235, 0.08);
}

.public-toggle:hover {
  background: rgba(255,255,255,0.05);
}

body[data-interface="light"] .public-toggle:hover {
  background: rgba(37, 99, 235, 0.05);
}

body[data-interface="light"] .interface-menu {
  color: var(--text);
}

body[data-interface="light"] .interface-trigger {
  border-color: rgba(15, 23, 42, 0.14);
  background: #fff;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.12);
}

body[data-interface="light"] .interface-trigger:hover,
body[data-interface="light"] .interface-menu.open .interface-trigger {
  border-color: rgba(15, 23, 42, 0.22);
  background: #f8fafc;
  box-shadow: 0 14px 30px rgba(15, 23, 42, 0.16);
}

body[data-interface="light"] .interface-menu-list {
  background: #fff;
  border-color: rgba(15, 23, 42, 0.12);
  box-shadow: 0 16px 36px rgba(15, 23, 42, 0.14);
}

body[data-interface="light"] .interface-option {
  color: var(--text);
}

body[data-interface="light"] .interface-option:hover,
body[data-interface="light"] .interface-option.active {
  color: var(--text);
  background: rgba(37, 99, 235, 0.1);
}

body[data-interface="light"] .answer-btn:hover,
body[data-interface="light"] .mode-option:hover,
body[data-interface="light"] button.ghost:hover {
  border-color: rgba(37, 99, 235, 0.28);
  background: rgba(37, 99, 235, 0.06);
}

body[data-interface="light"] .mode-option.active,
body[data-interface="light"] .qa-option.edit-selected {
  background: rgba(37, 99, 235, 0.1);
  border-color: rgba(37, 99, 235, 0.45);
  color: var(--text);
}

body[data-interface="light"] .qa-item {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.12);
}

body[data-interface="light"] .qa-option {
  color: #111827;
  background: #f8fafc;
  border-color: rgba(15, 23, 42, 0.14);
}

body[data-interface="light"] .qa-option.correct {
  background: #dcfce7;
  border-color: #16a34a;
  color: #14532d;
}

body[data-interface="light"] .qa-item .answer {
  color: #166534;
  font-weight: 700;
}

body[data-interface="light"] button.ghost,
body[data-interface="light"] .suggestion-open,
body[data-interface="light"] .pdf-modal-close,
body[data-interface="light"] .pdf-modal-nav button,
body[data-interface="light"] .pdf-modal-link {
  border-color: rgba(15, 23, 42, 0.16);
}

body[data-interface="light"] .progress {
  background: rgba(15, 23, 42, 0.1);
}

body[data-interface="light"] .answer-btn {
  background: #ffffff !important;
  border-color: #cbd5e1 !important;
  color: #0f172a;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.05);
}

body[data-interface="light"] .answer-btn:hover {
  background: #eff6ff !important;
  border-color: #2563eb !important;
}

body[data-interface="light"] .answer-btn.selected {
  background: #dbeafe !important;
  border-color: #1d4ed8 !important;
  box-shadow: inset 0 0 0 1px #1d4ed8;
}

body[data-interface="light"] .answer-btn.correct {
  background: #dcfce7 !important;
  border-color: #16a34a !important;
  color: #14532d !important;
  box-shadow: inset 0 0 0 1px rgba(22, 163, 74, 0.35);
}

body[data-interface="light"] .answer-btn.wrong {
  background: #fee2e2 !important;
  border-color: #dc2626 !important;
  color: #7f1d1d !important;
  box-shadow: inset 0 0 0 1px rgba(220, 38, 38, 0.35);
}

body[data-interface="light"] .answer-btn.correct.selected {
  background: #dcfce7 !important;
  border-color: #15803d !important;
  color: #14532d !important;
}

body[data-interface="light"] .answer-btn.wrong.selected {
  background: #fee2e2 !important;
  border-color: #b91c1c !important;
  color: #7f1d1d !important;
}

body[data-interface="light"] .feedback.ok {
  color: #15803d;
  font-weight: 700;
}

body[data-interface="light"] .feedback.bad {
  color: #b91c1c;
  font-weight: 700;
}

body[data-interface="light"] .question-note,
body[data-interface="light"] .suggestions-box {
  background: #fffbeb;
  border-color: #f59e0b;
  color: #78350f;
}

body[data-interface="light"] .suggestion-meta {
  color: #92400e;
}

body[data-interface="light"] .suggestion-open {
  background: #fff7ed;
  border-color: #f59e0b;
  color: #7c2d12;
}

body[data-interface="light"] .suggestion-open:hover {
  background: #ffedd5;
  border-color: #d97706;
}

body[data-interface="dark"] .panel {
  border-color: rgba(148, 163, 184, 0.16);
  background: rgba(15, 23, 42, 0.74);
}

body[data-interface="dark"] .chip,
body[data-interface="dark"] .settings-panel,
body[data-interface="dark"] .mode-card,
body[data-interface="dark"] .mode-option,
body[data-interface="dark"] .answer-btn,
body[data-interface="dark"] .review-item,
body[data-interface="dark"] .qa-item,
body[data-interface="dark"] .qa-option,
body[data-interface="dark"] .stat-item,
body[data-interface="dark"] .dropdown-trigger,
body[data-interface="dark"] .number-input,
body[data-interface="dark"] .field input[type="text"],
body[data-interface="dark"] .field input[type="url"] {
  border-color: rgba(148, 163, 184, 0.22);
  background: rgba(15, 23, 42, 0.5);
}

body[data-interface="dark"] .interface-menu {
  color: var(--text);
}

body[data-interface="dark"] .interface-trigger {
  border-color: rgba(148, 163, 184, 0.24);
  background: rgba(15, 23, 42, 0.64);
}

body[data-interface="dark"] .interface-trigger:hover,
body[data-interface="dark"] .interface-menu.open .interface-trigger {
  border-color: rgba(148, 163, 184, 0.36);
  background: rgba(30, 41, 59, 0.86);
}

body[data-interface="dark"] .interface-menu-list {
  background: #202631;
  border-color: rgba(255,255,255,0.14);
  box-shadow: 0 16px 42px rgba(0,0,0,0.36);
}

body[data-interface="dark"] .interface-option {
  color: var(--text);
}

body[data-interface="dark"] .interface-option:hover,
body[data-interface="dark"] .interface-option.active {
  color: #e0f2fe;
  background: rgba(56, 189, 248, 0.14);
}

body[data-interface="dark"] .mode-option.active,
body[data-interface="dark"] .qa-option.edit-selected {
  background: rgba(56, 189, 248, 0.14);
  border-color: rgba(125, 211, 252, 0.55);
  color: #e0f2fe;
}

body[data-interface="dark"] .qa-item {
  background: rgba(15, 23, 42, 0.82);
  border-color: rgba(148, 163, 184, 0.26);
}

body[data-interface="dark"] .qa-option {
  color: #f8fafc;
  background: rgba(30, 41, 59, 0.92);
  border-color: rgba(148, 163, 184, 0.26);
}

body[data-interface="dark"] .qa-option.correct {
  background: rgba(22, 101, 52, 0.74);
  border-color: #4ade80;
  color: #dcfce7;
}

body[data-interface="dark"] .qa-item .answer {
  color: #86efac;
  font-weight: 700;
}

body[data-interface="dark"] .answer-btn {
  background: #111827 !important;
  border-color: #334155 !important;
  color: #f8fafc;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.28);
}

body[data-interface="dark"] .answer-btn:hover {
  background: #172033 !important;
  border-color: #38bdf8 !important;
}

body[data-interface="dark"] .answer-btn.selected {
  background: #0c4a6e !important;
  border-color: #7dd3fc !important;
  color: #f0f9ff !important;
  box-shadow: inset 0 0 0 1px rgba(125, 211, 252, 0.55);
}

body[data-interface="dark"] .answer-btn.correct {
  background: rgba(20, 83, 45, 0.92) !important;
  border-color: #4ade80 !important;
  color: #dcfce7 !important;
  box-shadow: inset 0 0 0 1px rgba(74, 222, 128, 0.45);
}

body[data-interface="dark"] .answer-btn.wrong {
  background: rgba(127, 29, 29, 0.92) !important;
  border-color: #f87171 !important;
  color: #fee2e2 !important;
  box-shadow: inset 0 0 0 1px rgba(248, 113, 113, 0.45);
}

body[data-interface="dark"] .answer-btn.correct.selected {
  background: rgba(20, 83, 45, 0.96) !important;
  border-color: #86efac !important;
  color: #dcfce7 !important;
}

body[data-interface="dark"] .answer-btn.wrong.selected {
  background: rgba(127, 29, 29, 0.96) !important;
  border-color: #fca5a5 !important;
  color: #fee2e2 !important;
}

body[data-interface="dark"] .feedback.ok {
  color: #86efac;
  font-weight: 700;
}

body[data-interface="dark"] .feedback.bad {
  color: #fca5a5;
  font-weight: 700;
}

body[data-interface="dark"] .question-note,
body[data-interface="dark"] .suggestions-box {
  background: rgba(120, 53, 15, 0.32);
  border-color: rgba(251, 191, 36, 0.62);
  color: #fde68a;
}

body[data-interface="dark"] .suggestion-meta {
  color: #fcd34d;
}

body[data-interface="dark"] .suggestion-open {
  background: rgba(120, 53, 15, 0.42);
  border-color: rgba(251, 191, 36, 0.66);
  color: #fde68a;
}

body[data-interface="dark"] .suggestion-open:hover {
  background: rgba(146, 64, 14, 0.55);
  border-color: #fbbf24;
}

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
}

.chip {
  border: 1px solid rgba(255,255,255,0.1);
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--text);
  display: inline-flex;
  gap: 8px;
  align-items: center;
}

.chip strong { color: inherit; }

.question {
  font-size: 1.35rem;
  line-height: 1.4;
  margin: 16px 0 24px 0;
}

.question-media-wrap {
  margin-top: 14px;
}

.question-media {
  width: min(520px, 100%);
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.22);
  box-shadow: 0 8px 24px rgba(0,0,0,0.25);
  background: rgba(255,255,255,0.05);
}

.question-media-list {
  display: grid;
  gap: 10px;
}

.qa-image {
  width: min(420px, 100%);
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.2);
  margin: 8px 0 10px 0;
  display: block;
}

.answers {
  display: grid;
  gap: 12px;
}

.answer-btn {
  background: rgba(255,255,255,0.08);
  border: 1px solid transparent;
  border-radius: 14px;
  padding: 14px 16px;
  text-align: left;
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
  transition: transform 0.15s ease, border 0.15s ease, background 0.15s ease;
}

.answer-btn:hover {
  transform: translateY(-2px);
  border-color: rgba(255,255,255,0.2);
}

.answer-btn.correct {
  background: rgba(34, 197, 94, 0.38);
  border-color: rgba(34, 197, 94, 0.8);
}

.answer-btn.wrong {
  background: rgba(239, 68, 68, 0.35);
  border-color: rgba(239, 68, 68, 0.85);
}

.answer-btn.selected {
  border-color: rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.14);
}

.answer-btn.wrong.selected {
  background: rgba(239, 68, 68, 0.45);
  border-color: rgba(239, 68, 68, 0.95);
}

.answer-btn.correct.selected {
  background: rgba(34, 197, 94, 0.08);
  border-color: rgba(34, 197, 94, 0.35);
}

.feedback {
  margin-top: 16px;
  min-height: 24px;
  font-size: 0.95rem;
}

.question-note {
  margin: 12px 0 16px 0;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(250, 204, 21, 0.45);
  background: rgba(250, 204, 21, 0.1);
  color: #fde68a;
  font-size: 0.92rem;
  line-height: 1.45;
}

.suggestions-box {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(250, 204, 21, 0.45);
  background: rgba(250, 204, 21, 0.1);
  color: #fde68a;
  font-size: 0.95rem;
  line-height: 1.45;
  display: grid;
  gap: 8px;
}

.suggestion-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: 0.85rem;
  color: rgba(255, 244, 214, 0.85);
}

.suggestion-open {
  border: 1px solid rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.08);
  color: var(--text);
  border-radius: 999px;
  padding: 6px 10px;
  cursor: pointer;
  font: inherit;
}

.suggestion-open:hover {
  background: rgba(255,255,255,0.14);
}

.pdf-modal {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(10, 12, 24, 0.72);
  backdrop-filter: blur(8px);
}

.pdf-modal-card {
  width: min(1100px, 100%);
  max-height: min(88vh, 980px);
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
  gap: 12px;
  overflow: hidden;
  padding: 18px;
  border-radius: 22px;
  border: 1px solid rgba(255,255,255,0.12);
  background: linear-gradient(180deg, rgba(28, 31, 56, 0.98), rgba(20, 23, 42, 0.98));
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
}

.pdf-modal-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
}

.pdf-modal-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.pdf-modal-sub {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.4;
}

.pdf-modal-close {
  border: 1px solid rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.08);
  color: var(--text);
  border-radius: 999px;
  padding: 8px 12px;
  cursor: pointer;
  font: inherit;
}

.pdf-modal-close:hover {
  background: rgba(255,255,255,0.14);
}

.pdf-modal-fragment {
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(250, 204, 21, 0.1);
  border: 1px solid rgba(250, 204, 21, 0.35);
  color: #fde68a;
  line-height: 1.5;
  font-size: 0.95rem;
  overflow: auto;
}

.pdf-modal-preview {
  display: grid;
  gap: 10px;
  min-height: 0;
  overflow: auto;
}

.pdf-modal-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.pdf-modal-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.pdf-modal-nav button {
  border: 1px solid rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.08);
  color: var(--text);
  border-radius: 999px;
  padding: 8px 12px;
  cursor: pointer;
  font: inherit;
}

.pdf-modal-nav button:hover:not(:disabled) {
  background: rgba(255,255,255,0.14);
}

.pdf-modal-nav button:disabled {
  opacity: 0.45;
  cursor: default;
}

.pdf-modal-page {
  color: var(--muted);
  font-size: 0.92rem;
}

.pdf-modal-canvas-wrap {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 220px;
  padding: 8px;
  border-radius: 16px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  overflow: auto;
}

.pdf-modal-canvas {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.18);
  background: white;
}

.pdf-modal-status {
  color: var(--muted);
  font-size: 0.9rem;
}

.pdf-modal-frame {
  width: 100%;
  min-height: 420px;
  height: min(62vh, 760px);
  border: 0;
  border-radius: 16px;
  background: rgba(255,255,255,0.05);
}

.pdf-modal-link {
  align-self: start;
  border: 1px solid rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.08);
  color: var(--text);
  border-radius: 999px;
  padding: 8px 12px;
  text-decoration: none;
  font: inherit;
}

.pdf-modal-link:hover {
  background: rgba(255,255,255,0.14);
}

body.modal-open {
  overflow: hidden;
  touch-action: none;
}

.suggestions-box > div:first-child {
  word-break: break-word;
}

.feedback.ok { color: var(--ok); }
.feedback.bad { color: var(--bad); }

.actions {
  margin-top: 24px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.menu-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: minmax(0, 1fr);
}

.menu-actions {
  justify-content: center;
  margin-top: 18px;
  flex-wrap: nowrap;
}

.menu-actions button {
  flex: 1 1 0;
  min-width: 0;
  max-width: 220px;
  white-space: nowrap;
}

.menu-start-actions {
  justify-content: center;
  margin-top: 18px;
}

.menu-start-actions .primary {
  min-width: min(280px, 100%);
}

.field {
  display: grid;
  gap: 8px;
}

.field label {
  font-size: 0.85rem;
  color: var(--muted);
}

.field input[type="text"],
.field input[type="url"] {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 10px;
  padding: 10px 12px;
  color: var(--text);
  font-size: 0.95rem;
}

.mode-card {
  margin-top: 12px;
  padding: 14px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.1);
  background: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.04));
  display: grid;
  gap: 12px;
}

.settings-panel {
  margin-top: 16px;
  padding: 14px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.05);
}

.settings-panel .mode-card {
  margin-top: 0;
}

.settings-actions {
  justify-content: center;
  margin-top: 14px;
}

.settings-header {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 12px;
}

#settings-back-btn,
#qa-back-btn,
#stats-back-btn {
  border-color: rgba(251, 113, 133, 0.82);
  background: rgba(244, 63, 94, 0.2);
  color: #ffe4e6;
  font-weight: 800;
  box-shadow: 0 8px 22px rgba(190, 18, 60, 0.2);
}

#settings-back-btn:hover,
#qa-back-btn:hover,
#stats-back-btn:hover {
  border-color: #fb7185;
  background: rgba(244, 63, 94, 0.32);
  color: #fff1f2;
}

body[data-interface="light"] #settings-back-btn,
body[data-interface="light"] #qa-back-btn,
body[data-interface="light"] #stats-back-btn {
  border-color: #e11d48;
  background: #fff1f2;
  color: #9f1239;
  box-shadow: 0 8px 20px rgba(225, 29, 72, 0.16);
}

body[data-interface="light"] #settings-back-btn:hover,
body[data-interface="light"] #qa-back-btn:hover,
body[data-interface="light"] #stats-back-btn:hover {
  background: #ffe4e6;
  color: #881337;
}

body[data-interface="dark"] #settings-back-btn,
body[data-interface="dark"] #qa-back-btn,
body[data-interface="dark"] #stats-back-btn {
  border-color: #fb7185;
  background: rgba(159, 18, 57, 0.58);
  color: #ffe4e6;
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.22);
}

body[data-interface="dark"] #settings-back-btn:hover,
body[data-interface="dark"] #qa-back-btn:hover,
body[data-interface="dark"] #stats-back-btn:hover {
  background: rgba(190, 18, 60, 0.72);
  color: #fff1f2;
}

.view-header {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 44px;
  padding: 0 142px;
}

.view-header #qa-back-btn,
.view-header #settings-back-btn,
.view-header #stats-back-btn {
  position: absolute;
  top: 0;
  left: 0;
}

.view-title {
  margin: 0;
  color: var(--text);
  text-align: center;
  font-size: clamp(1.15rem, 1vw + 1rem, 1.55rem);
  font-weight: 850;
  line-height: 1.25;
}

.stats-view-title {
  font-size: clamp(1rem, 0.7vw + 0.95rem, 1.28rem);
  font-weight: 800;
}

.stats-actions {
  justify-content: center;
  margin-top: -4px;
}

.mode-switch {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.mode-option {
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.04);
  color: var(--text);
  border-radius: 14px;
  padding: 12px 14px;
  text-align: left;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.mode-option:hover {
  transform: translateY(-1px);
  border-color: rgba(255,255,255,0.26);
}

.mode-option.active {
  background: rgba(244, 114, 182, 0.18);
  border-color: rgba(249, 168, 212, 0.65);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.08);
}

.mode-option strong {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.mode-option span {
  display: block;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.4;
}

.mode-details {
  display: grid;
  gap: 10px;
}

.number-input {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 10px;
  padding: 10px 12px;
  color: var(--text);
  font-size: 0.95rem;
  width: 100%;
}

.field-hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.4;
}

.dropdown {
  position: relative;
  width: 100%;
}

.dropdown-trigger {
  width: 100%;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 10px;
  padding: 10px 12px;
  color: var(--text);
  font-size: 0.95rem;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  cursor: pointer;
}

.dropdown-trigger::after {
  content: "▾";
  font-size: 0.9rem;
  color: var(--muted);
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: linear-gradient(180deg, rgba(255, 226, 240, 0.95), rgba(255, 199, 225, 0.95));
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 12px;
  box-shadow: var(--shadow);
  z-index: 5;
  max-height: 260px;
  overflow: auto;
  display: none;
}

.dropdown.open .dropdown-menu {
  display: block;
}

.dropdown-item {
  padding: 10px 12px;
  cursor: pointer;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  font-size: 0.95rem;
  color: #3b0a26;
}

body[data-interface="light"] .dropdown-menu {
  background: #fff;
  border-color: rgba(15, 23, 42, 0.12);
}

body[data-interface="light"] .dropdown-item {
  color: var(--text);
}

body[data-interface="light"] .dropdown-item:hover {
  background: rgba(37, 99, 235, 0.08);
}

body[data-interface="dark"] .dropdown-menu {
  background: #202631;
  border-color: rgba(255,255,255,0.14);
}

body[data-interface="dark"] .dropdown-item {
  color: var(--text);
}

body[data-interface="dark"] .dropdown-item:hover {
  background: rgba(56, 189, 248, 0.14);
}

.dropdown-item:last-child {
  border-bottom: none;
}

.dropdown-item:hover {
  background: rgba(242, 114, 182, 0.25);
}

.dropdown-item[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
}

.stats-list {
  display: grid;
  gap: 10px;
  margin-top: 8px;
}

.stat-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  font-size: 0.95rem;
}

.stat-item span {
  color: var(--muted);
  font-size: 0.85rem;
}

button.primary {
  background: var(--accent);
  color: #3b0a26;
  border: none;
  border-radius: 999px;
  padding: 12px 20px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 10px 20px rgba(242, 158, 56, 0.3);
}

body[data-interface="light"] button.primary {
  color: #fff;
  box-shadow: 0 10px 20px rgba(37, 99, 235, 0.16);
}

button.primary:hover { transform: translateY(-2px); }

button.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 999px;
  padding: 12px 20px;
  cursor: pointer;
}

button.ghost.small {
  padding: 6px 12px;
  font-size: 0.8rem;
}

#abandon-btn {
  color: #fecaca;
  border-color: rgba(239, 68, 68, 0.55);
  background: rgba(239, 68, 68, 0.14);
  padding: 10px 14px;
  min-height: 40px;
  white-space: nowrap;
}

#abandon-btn:hover {
  background: rgba(239, 68, 68, 0.22);
  border-color: rgba(239, 68, 68, 0.75);
}

#suggestions-btn {
  color: #fde68a;
  border-color: rgba(250, 204, 21, 0.6);
  background: rgba(250, 204, 21, 0.16);
  padding: 10px 14px;
  min-height: 40px;
  white-space: nowrap;
}

#suggestions-btn:hover {
  background: rgba(250, 204, 21, 0.24);
  border-color: rgba(250, 204, 21, 0.8);
}

body[data-interface="light"] #abandon-btn {
  color: #991b1b;
  border-color: #f87171;
  background: #fef2f2;
  font-weight: 700;
}

body[data-interface="light"] #abandon-btn:hover {
  color: #7f1d1d;
  border-color: #dc2626;
  background: #fee2e2;
}

body[data-interface="light"] #suggestions-btn {
  color: #854d0e;
  border-color: #f59e0b;
  background: #fffbeb;
  font-weight: 700;
}

body[data-interface="light"] #suggestions-btn:hover {
  color: #713f12;
  border-color: #d97706;
  background: #fef3c7;
}

body[data-interface="dark"] #abandon-btn {
  color: #fecaca;
  border-color: #f87171;
  background: rgba(127, 29, 29, 0.42);
  font-weight: 700;
}

body[data-interface="dark"] #abandon-btn:hover {
  color: #fee2e2;
  border-color: #fca5a5;
  background: rgba(127, 29, 29, 0.62);
}

body[data-interface="dark"] #suggestions-btn {
  color: #fde68a;
  border-color: #fbbf24;
  background: rgba(120, 53, 15, 0.42);
  font-weight: 700;
}

body[data-interface="dark"] #suggestions-btn:hover {
  color: #fef3c7;
  border-color: #fcd34d;
  background: rgba(146, 64, 14, 0.58);
}

.hidden { display: none; }

.top-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  min-height: 34px;
  gap: 14px;
}

.result {
  font-size: 1.2rem;
  line-height: 1.6;
  color: var(--muted);
}

.review-list {
  margin-top: 16px;
  display: grid;
  gap: 10px;
}

.review-item {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 0.95rem;
  line-height: 1.4;
}

.review-item strong {
  color: var(--text);
}

.review-panel {
  display: grid;
  gap: 16px;
}

.review-list-container {
  max-height: 70vh;
  overflow: auto;
  display: grid;
  gap: 16px;
  padding-right: 4px;
}

.qa-item {
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
}

.qa-item .question {
  margin: 0 0 8px 0;
  font-size: 1rem;
}

.qa-item .answer {
  color: var(--accent-2);
  font-size: 0.95rem;
}

.qa-options {
  display: grid;
  gap: 6px;
  margin: 8px 0 6px 0;
  padding: 0;
  list-style: none;
  font-size: 0.95rem;
}

.qa-option {
  padding: 6px 10px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.04);
}

.qa-option.editable {
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.1s ease;
}

.qa-option.editable:hover {
  border-color: rgba(255,255,255,0.22);
  background: rgba(255,255,255,0.09);
  transform: translateY(-1px);
}

.qa-option.edit-selected {
  border-color: rgba(244, 114, 182, 0.75);
  background: rgba(244, 114, 182, 0.22);
  color: #ffe8f4;
}

.qa-option.correct {
  border-color: rgba(34, 197, 94, 0.6);
  background: rgba(34, 197, 94, 0.18);
  color: #d9fbe2;
}

.qa-edit-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
  align-items: center;
}

.qa-note {
  font-size: 0.84rem;
  color: var(--muted);
  margin-top: 8px;
}

.answer-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 999px;
  background: rgba(34, 197, 94, 0.2);
  border: 1px solid rgba(34, 197, 94, 0.5);
  color: #c8facc;
  margin-left: 8px;
  vertical-align: middle;
}

.progress {
  height: 8px;
  border-radius: 999px;
  background: rgba(255,255,255,0.12);
  overflow: hidden;
  margin-top: 12px;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 0.25s ease;
}

.score {
  font-size: clamp(2.4rem, 2vw + 1.6rem, 3.2rem);
  color: var(--accent-2);
  font-weight: 600;
  margin: 12px 0 0 0;
}

@media (max-width: 640px) {
  body {
    min-height: 100svh;
    place-items: start center;
    padding: 86px 16px 24px;
  }
  .app {
    gap: 18px;
  }
  .interface-menu {
    top: max(14px, env(safe-area-inset-top));
    right: 14px;
  }
  .interface-trigger {
    width: 50px;
    height: 50px;
  }
  .interface-icon {
    width: 24px;
    height: 24px;
  }
  .interface-menu-list {
    width: 154px;
  }
  header {
    gap: 6px;
  }
  .public-toggle {
    grid-template-columns: minmax(0, 1fr) auto auto;
    gap: 8px;
    min-height: 42px;
    padding: 9px 12px;
  }
  .public-toggle-meta {
    font-size: 0.78rem;
  }
  .public-toggle-action {
    min-width: 62px;
    padding: 5px 8px;
    font-size: 0.74rem;
  }
  .public-info-body {
    padding: 12px;
  }
  .public-info-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .public-copy,
  .public-note {
    font-size: 0.86rem;
  }
  .public-tags {
    gap: 6px;
  }
  .public-contact {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }
  .contact-links {
    justify-content: flex-start;
  }
  .contact-links a {
    flex: 1 1 auto;
    justify-content: center;
  }
  .stats { flex-direction: column; align-items: flex-start; }
  .question { font-size: 1.2rem; }
  .stats button.ghost.small { align-self: flex-start; }
  .stats.quiz-stats { flex-direction: row; align-items: center; }
  .menu-grid { gap: 24px; }
  .panel { padding: 20px; }
  .actions { flex-direction: column; align-items: stretch; }
  .menu-actions {
    flex-direction: row;
    align-items: center;
  }
  .menu-actions button {
    width: auto;
    padding-left: 10px;
    padding-right: 10px;
  }
  button.primary, button.ghost { width: 100%; justify-content: center; }
  .menu-actions button { width: auto; }
  .view-header #settings-back-btn,
  .view-header #qa-back-btn,
  .view-header #stats-back-btn {
    width: auto;
    align-self: flex-start;
  }
  .view-header {
    min-height: 86px;
    padding: 46px 0 0;
  }
  .view-title {
    font-size: 1.08rem;
  }
  .mode-switch { grid-template-columns: 1fr; }
  .review-list-container { max-height: 75vh; padding-right: 0; }
  .qa-item { padding: 14px; }
  .suggestions-box { padding: 12px; font-size: 0.92rem; }
  .suggestion-meta { flex-direction: column; align-items: stretch; }
  .suggestion-open { width: 100%; justify-content: center; text-align: center; padding: 10px 12px; }
  .pdf-modal { padding: 10px; align-items: end; }
  .pdf-modal-card {
    width: 100%;
    max-height: 92vh;
    padding: 14px;
    border-radius: 18px 18px 0 0;
    grid-template-rows: auto auto minmax(280px, 1fr);
  }
  .pdf-modal-top { flex-direction: column; align-items: stretch; }
  .pdf-modal-title { font-size: 0.98rem; }
  .pdf-modal-sub { font-size: 0.84rem; }
  .pdf-modal-close { width: 100%; text-align: center; padding: 10px 12px; }
  .pdf-modal-fragment {
    max-height: 24vh;
    font-size: 0.9rem;
    padding: 12px;
  }
  .pdf-modal-preview {
    gap: 8px;
    align-content: start;
  }
  .pdf-modal-toolbar {
    align-items: stretch;
  }
  .pdf-modal-nav {
    width: 100%;
  }
  .pdf-modal-nav button {
    flex: 1 1 0;
    text-align: center;
  }
  .pdf-modal-page,
  .pdf-modal-status {
    width: 100%;
  }
  .pdf-modal-canvas-wrap {
    min-height: 200px;
    max-height: 46vh;
    padding: 6px;
  }
  .pdf-modal-frame {
    min-height: 220px;
    height: 34vh;
    display: none;
    border-radius: 12px;
  }
  .pdf-modal-link {
    width: 100%;
    text-align: center;
    padding: 10px 12px;
  }
  #quiz-panel .stats { position: sticky; top: 0; z-index: 2; background: rgba(255, 230, 242, 0.6); backdrop-filter: blur(8px); padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,0.2); }
  body[data-interface="light"] #quiz-panel .stats { background: rgba(246, 248, 251, 0.88); border-bottom-color: rgba(15, 23, 42, 0.08); }
  body[data-interface="dark"] #quiz-panel .stats { background: rgba(22, 26, 33, 0.88); border-bottom-color: rgba(255,255,255,0.12); }
  #stats-panel .stats { gap: 10px; }
  #stats-panel .actions { width: 100%; }
}