:root {
  --bg-1: #f4f8ff;
  --bg-2: #eef6ee;
  --card: #ffffff;
  --text: #15202b;
  --muted: #5f6d7a;
  --line: #dfe5ee;
  --accent: #0a66c2;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background: linear-gradient(120deg, var(--bg-1), var(--bg-2));
  min-height: 100vh;
}

.topbar {
  text-align: center;
  padding: 24px 16px 10px;
}

.topbar h1 {
  margin: 0;
  font-size: clamp(1.7rem, 2.5vw, 2.2rem);
}

.topbar p {
  margin: 8px 0 0;
  color: var(--muted);
}

.top-nav {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.top-nav a {
  text-decoration: none;
  color: var(--accent);
  background: #e8f1fb;
  border: 1px solid #cfe1f4;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
}

.top-nav a.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.page-grid {
  display: grid;
  grid-template-columns: minmax(180px, 220px) minmax(320px, 760px) minmax(180px, 220px);
  gap: 16px;
  width: min(1240px, 96%);
  margin: 20px auto 32px;
  align-items: start;
}

.ad-column {
  position: sticky;
  top: 14px;
}

.ad-card,
.question-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 8px 20px rgba(12, 27, 45, 0.06);
}

.ad-card {
  padding: 14px;
}

.ad-card h3 {
  margin: 0 0 12px;
  font-size: 1rem;
  font-weight: 600;
}

.ad-placeholder {
  min-height: 250px;
  border: 2px dashed #b6c4d6;
  border-radius: 12px;
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--muted);
  background: #f9fbff;
  padding: 10px;
  line-height: 1.4;
}

.question-column {
  display: flex;
  justify-content: center;
}

.question-card {
  width: 100%;
  padding: 22px;
}

.home-select-card h2 {
  margin: 0;
}

.paper-list {
  display: grid;
  gap: 12px;
}

.paper-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  background: #fbfdff;
}

.paper-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.paper-head h3 {
  margin: 0;
  font-size: 1.03rem;
}

.paper-meta {
  margin: 8px 0 12px;
  color: var(--muted);
  font-size: 0.9rem;
}

.home-actions {
  margin-top: 14px;
}

.seo-content {
  width: min(1240px, 96%);
  margin: 0 auto 28px;
}

.seo-content-inner {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 8px 20px rgba(12, 27, 45, 0.06);
  padding: 18px;
}

.seo-content-inner h2 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}

.seo-content-inner p {
  margin: 0;
  line-height: 1.6;
  color: var(--muted);
}

.card-link-btn {
  display: inline-block;
  text-decoration: none;
  border-radius: 10px;
  padding: 9px 12px;
  font-size: 0.9rem;
  font-weight: 600;
  background: var(--accent);
  color: #fff;
}

.card-link-btn.ghost {
  background: #edf4ff;
  color: var(--accent);
  border: 1px solid #cfe1f4;
}

.form-card h2,
.auth-card h2,
.dashboard-card h2 {
  margin: 0;
}

.form-subtitle {
  margin: 10px 0 16px;
  color: var(--muted);
}

.request-form {
  display: grid;
  gap: 10px;
}

.request-form label {
  font-weight: 600;
  font-size: 0.92rem;
}

.request-form input,
.request-form textarea {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  font-size: 0.95rem;
  font-family: inherit;
  background: #fff;
}

.request-form textarea {
  resize: vertical;
  min-height: 90px;
}

.field label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  font-size: 0.92rem;
}

.field input[type="text"],
.field input[type="file"] {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  font-size: 0.95rem;
  font-family: inherit;
  background: #fff;
}

.alert {
  border-radius: 10px;
  padding: 10px 12px;
  margin: 0 0 14px;
  font-weight: 600;
  font-size: 0.92rem;
}

.alert.success {
  background: #e8f9ee;
  border: 1px solid #b3ebc6;
  color: #14743d;
}

.alert.error {
  background: #fff0f0;
  border: 1px solid #ffc9c9;
  color: #a02b2b;
}

.question-meta {
  margin-bottom: 12px;
  color: var(--accent);
  font-weight: 600;
}

#question-text {
  margin: 0 0 18px;
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  line-height: 1.45;
}

#option-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.question-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  background: #fbfdff;
}

.question-title {
  margin: 0;
  font-size: 1rem;
  line-height: 1.45;
}

.option-sublist {
  margin: 10px 0 0;
  padding-left: 20px;
  display: grid;
  gap: 8px;
}

.answer-box {
  margin-top: 10px;
  border: 1px solid #d9e3f1;
  border-radius: 10px;
  background: #f6f9ff;
  padding: 8px 10px;
}

.answer-box summary {
  cursor: pointer;
  font-weight: 600;
  color: #1a4f8b;
}

.answer-box p {
  margin: 10px 0 0;
  line-height: 1.5;
  color: #1f2f40;
}

.option-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
  background: #fff;
}

.controls {
  margin-top: 22px;
  display: flex;
  gap: 12px;
  justify-content: space-between;
  flex-wrap: wrap;
}

button {
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.95rem;
  font-weight: 600;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}

button:disabled {
  background: #90a4b5;
  cursor: not-allowed;
}

.simple-shell {
  width: min(1020px, 94%);
  margin: 18px auto 32px;
  display: grid;
  gap: 16px;
}

.auth-card,
.dashboard-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 8px 20px rgba(12, 27, 45, 0.06);
  padding: 22px;
}

.auth-card {
  width: min(420px, 100%);
  margin: 0 auto;
}

.dashboard-card h2 {
  margin-bottom: 14px;
}

.upload-row {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 10px;
  margin: 0 0 16px;
  align-items: end;
}

.upload-action {
  display: flex;
  align-items: end;
}

.upload-action button {
  white-space: nowrap;
}

.chip {
  display: inline-block;
  border: 1px solid #d6dce5;
  background: #f3f6fa;
  color: #4c5b69;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.78rem;
  font-weight: 700;
}

.chip-active {
  border-color: #97d8a7;
  background: #e9faee;
  color: #1f7f3e;
}

.action-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.action-group form {
  margin: 0;
}

.action-group a {
  text-decoration: none;
  color: var(--accent);
  border: 1px solid #cfe1f4;
  background: #eef5ff;
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 0.85rem;
  font-weight: 600;
}

.rename-form {
  display: flex;
  gap: 6px;
}

.rename-form input {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 0.84rem;
  min-width: 180px;
}

.danger-btn {
  background: #c23a3a;
}

.mock-host-card {
  padding: 14px;
}

.mock-host-title {
  font-weight: 600;
  margin: 0 0 10px;
  color: var(--accent);
}

.mock-frame {
  width: 100%;
  min-height: 78vh;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 920px;
}

th,
td {
  border: 1px solid var(--line);
  padding: 10px;
  text-align: left;
  vertical-align: top;
  font-size: 0.9rem;
}

th {
  background: #f0f6ff;
  font-weight: 700;
}

.empty-state {
  margin: 0;
  color: var(--muted);
}

@media (max-width: 980px) {
  .page-grid {
    grid-template-columns: 1fr;
  }

  .ad-column {
    position: static;
  }

  .ad-placeholder {
    min-height: 120px;
  }

  .upload-row {
    grid-template-columns: 1fr;
  }

  .upload-action {
    justify-content: flex-start;
  }

  .mock-frame {
    min-height: 65vh;
  }
}

.paper-stack {
  width: 100%;
  display: grid;
  gap: 16px;
}

.paper-hero-card {
  padding: 24px;
  background:
    radial-gradient(circle at top left, rgba(10, 102, 194, 0.12), transparent 38%),
    linear-gradient(135deg, #ffffff, #f6fbff 52%, #f3faf3);
}

.paper-hero-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.paper-kicker {
  margin: 0 0 8px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.76rem;
  font-weight: 700;
}

.paper-hero-title {
  margin: 0;
  font-size: clamp(1.35rem, 2.4vw, 1.9rem);
}

.paper-hero-copy {
  margin: 10px 0 0;
  max-width: 60ch;
  color: var(--muted);
  line-height: 1.6;
}

.paper-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.paper-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 999px;
  border: 1px solid #d7e5f5;
  background: rgba(255, 255, 255, 0.9);
  color: #24415e;
  padding: 8px 12px;
  font-size: 0.88rem;
}

.paper-session-card {
  padding: 22px;
}

.paper-status-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.paper-status-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px;
  background: linear-gradient(180deg, #ffffff, #f8fbff);
}

.paper-status-label {
  display: block;
  color: var(--muted);
  font-size: 0.84rem;
  margin-bottom: 6px;
}

.paper-status-card strong {
  font-size: 1.2rem;
}

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

.paper-page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 0;
}

.paper-toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.paper-mini-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-top: 16px;
}

.paper-mini-card {
  border: 1px solid #dbe5f2;
  border-radius: 14px;
  padding: 12px;
  background: #f8fbff;
}

.paper-mini-label {
  display: block;
  color: var(--muted);
  font-size: 0.8rem;
  margin-bottom: 6px;
}

.paper-mini-card strong {
  font-size: 1.02rem;
}

.paper-result-text {
  margin: 16px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.paper-empty-state {
  margin-top: 16px;
}

.paper-question-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.paper-question-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px;
  background: linear-gradient(180deg, #ffffff, #fbfdff);
  box-shadow: 0 10px 22px rgba(12, 27, 45, 0.05);
}

.paper-question-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.paper-question-number {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.92rem;
}

.paper-question-state {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 0.78rem;
  font-weight: 700;
  border: 1px solid #d8e1eb;
  background: #f5f8fb;
  color: #49606f;
}

.paper-question-state.is-answered {
  background: #eef6ff;
  border-color: #cfe1f4;
  color: #1e5a98;
}

.paper-question-state.is-correct {
  background: #ebf9ef;
  border-color: #bde7c6;
  color: #1f7a3f;
}

.paper-question-state.is-wrong {
  background: #fff2f2;
  border-color: #f4c7c7;
  color: #a02b2b;
}

.paper-question-state.is-skipped,
.paper-question-state.is-pending {
  background: #fff8ec;
  border-color: #f0d9a8;
  color: #8a5a07;
}

.paper-question-title {
  margin: 0;
  line-height: 1.6;
  font-size: 1.04rem;
}

.paper-option-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: grid;
  gap: 10px;
}

.paper-option-button {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 14px;
  background: #fff;
  color: var(--text);
  transition: transform 0.16s ease, box-shadow 0.16s ease, border-color 0.16s ease;
}

.paper-option-button:hover:not(:disabled) {
  transform: translateY(-1px);
  border-color: #8ebbe9;
  box-shadow: 0 8px 18px rgba(10, 102, 194, 0.08);
}

.paper-option-button.is-selected {
  border-color: #4e94d8;
  background: #edf6ff;
}

.paper-option-button.is-correct {
  border-color: #52ab74;
  background: #ebf9ef;
}

.paper-option-button.is-wrong {
  border-color: #d87070;
  background: #fff1f1;
}

.paper-option-button:disabled {
  cursor: default;
}

.paper-option-badge {
  width: 34px;
  height: 34px;
  display: inline-grid;
  place-items: center;
  border-radius: 50%;
  background: #edf3fb;
  color: var(--accent);
  font-weight: 700;
  flex: 0 0 34px;
}

.paper-inline-note,
.paper-review {
  margin-top: 14px;
  border-radius: 14px;
  padding: 12px 14px;
  line-height: 1.55;
}

.paper-inline-note {
  border: 1px solid #dbe5f2;
  background: #f7faff;
  color: #49606f;
}

.paper-inline-note.is-saved {
  border-color: #cae6d3;
  background: #eef9f1;
  color: #21673d;
}

.paper-inline-note.is-muted {
  color: var(--muted);
}

.paper-review {
  border: 1px solid #dbe5f2;
  background: #f7faff;
}

.paper-review.is-correct {
  border-color: #bde7c6;
  background: #ecf9ef;
}

.paper-review.is-incorrect {
  border-color: #f1c0c0;
  background: #fff2f2;
}

.paper-review.is-skipped {
  border-color: #f0d9a8;
  background: #fff9ed;
}

.paper-review-title {
  margin: 0 0 8px;
  font-weight: 700;
}

.paper-review p {
  margin: 6px 0 0;
}

.paper-controls {
  margin-top: 20px;
}

.secondary-btn {
  background: #eef5ff;
  color: var(--accent);
  border: 1px solid #cfe1f4;
}

.submit-btn {
  background: #0e8f53;
}

@media (max-width: 980px) {
  .paper-status-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .paper-mini-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .paper-hero-head {
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .paper-status-strip {
    grid-template-columns: 1fr;
  }

  .paper-mini-stats {
    grid-template-columns: 1fr;
  }

  .paper-session-card,
  .paper-hero-card {
    padding: 16px;
  }

  .paper-option-button {
    padding: 11px 12px;
  }

  .paper-toolbar-actions {
    width: 100%;
  }

  .paper-toolbar-actions button,
  .paper-toolbar-actions .secondary-btn,
  .paper-toolbar-actions .submit-btn {
    flex: 1 1 160px;
  }
}