/* style.css — Question Paper Studio unified stylesheet */
/* Merges designer + validator styling into one consistent design */

/* ============================================================
   RESET & TOKENS
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f4f6fb;
  --bg-card: #ffffff;
  --bg-sidebar: #1a1d29;
  --bg-input: #f8f9fc;
  --border: #e2e5ef;
  --border-focus: #4a6cf7;
  --text: #1a1d29;
  --text-secondary: #6b7085;
  --text-muted: #9499b3;
  --text-sidebar: #c0c4d8;
  --accent: #4a6cf7;
  --accent-light: #e8ecff;
  --green: #4caf50;
  --red: #f44336;
  --orange: #ff9800;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 3px rgba(26,29,41,0.08);
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

html { font-size: 15px; scroll-behavior: smooth; }
body { font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.5; min-height: 100vh; }

/* ============================================================
   HEADER
   ============================================================ */
.app-header {
  background: var(--bg-sidebar); color: #fff; padding: 0.75rem 2rem;
  display: flex; align-items: center; justify-content: space-between;
  position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}
.app-header h1 { font-size: 1.2rem; font-weight: 600; letter-spacing: -0.02em; }
.app-header .subtitle { font-size: 0.78rem; color: var(--text-sidebar); margin-top: 0.05rem; }
.header-actions { display: flex; gap: 0.5rem; align-items: center; }

.btn-sm {
  padding: 0.35rem 0.7rem; font-size: 0.76rem; border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.15); background: transparent;
  color: var(--text-sidebar); cursor: pointer; transition: all 0.15s; text-decoration: none;
}
.btn-sm:hover { background: rgba(255,255,255,0.1); color: #fff; }

/* ============================================================
   TAB NAVIGATION
   ============================================================ */
.tab-bar {
  display: flex; border-bottom: 2px solid var(--border); background: var(--bg-card);
  position: sticky; top: 56px; z-index: 99;
}
.tab-btn {
  padding: 0.7rem 1.5rem; font-size: 0.85rem; font-family: var(--font); font-weight: 500;
  border: none; background: none; cursor: pointer; color: var(--text-muted);
  transition: all 0.15s; position: relative; display: flex; align-items: center; gap: 0.4rem;
}
.tab-btn:hover { color: var(--text); background: var(--bg); }
.tab-btn.active { color: var(--accent); font-weight: 600; }
.tab-btn.active::after {
  content: ''; position: absolute; bottom: -2px; left: 0; right: 0;
  height: 2px; background: var(--accent);
}
.tab-btn .tab-icon { font-size: 1rem; }
.tab-btn .tab-badge {
  font-size: 0.65rem; background: var(--accent-light); color: var(--accent);
  padding: 0.1rem 0.4rem; border-radius: 8px; margin-left: 0.2rem;
}

/* Tab content panels */
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ============================================================
   SHARED BUTTONS
   ============================================================ */
.btn {
  padding: 0.45rem 1rem; font-size: 0.82rem; font-family: var(--font); font-weight: 500;
  border-radius: var(--radius-sm); border: 1px solid var(--border); cursor: pointer;
  transition: all 0.15s; background: var(--bg-card); color: var(--text);
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: #3b5de7; color: #fff; }
.btn-primary:disabled { background: #a0b4f7; border-color: #a0b4f7; }
.btn-danger { border-color: var(--red); color: var(--red); }
.btn-danger:hover { background: var(--red); color: #fff; }

/* ============================================================
   DESIGN TAB — Full-width layout (no sidebar preview)
   ============================================================ */
.design-layout {
  display: grid; grid-template-columns: 1fr 400px; gap: 0;
  min-height: calc(100vh - 110px);
}
@media (max-width: 1024px) {
  .design-layout { grid-template-columns: 1fr; }
}

.design-form {
  padding: 1.5rem 1.5rem 3rem; overflow-y: auto;
}
.design-form-inner { max-width: 680px; margin: 0 auto; }

.design-preview {
  background: var(--bg-sidebar); color: #fff; padding: 1.25rem;
  position: sticky; top: 110px; height: calc(100vh - 110px);
  display: flex; flex-direction: column; overflow: hidden;
}
@media (max-width: 1024px) {
  .design-preview { position: relative; top: 0; height: auto; min-height: 350px; }
}

.preview-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 0.6rem; flex-shrink: 0;
}
.preview-header h2 { font-size: 0.85rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-sidebar); }

.preview-actions { display: flex; gap: 0.4rem; flex-wrap: wrap; }

.btn-preview {
  padding: 0.35rem 0.8rem; font-size: 0.76rem; border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.15); background: transparent; color: #fff;
  cursor: pointer; transition: all 0.15s; white-space: nowrap; font-family: var(--font);
}
.btn-preview:hover { background: var(--accent); border-color: var(--accent); }
.btn-preview.copied { background: var(--green); border-color: var(--green); }
.btn-preview.danger { border-color: rgba(244,67,54,0.4); color: #ef9a9a; }
.btn-preview.danger:hover { background: var(--red); border-color: var(--red); color: #fff; }

.preview-textarea {
  flex: 1; width: 100%; background: #0f111a; color: #c0c4d8;
  border: 1px solid rgba(255,255,255,0.08); border-radius: var(--radius-sm);
  padding: 0.8rem; font-family: var(--font-mono); font-size: 0.76rem; line-height: 1.6;
  resize: none; overflow-y: auto; min-height: 180px;
}
.preview-textarea:focus { outline: none; border-color: var(--accent); }

.preview-footer {
  margin-top: 0.4rem; font-size: 0.7rem; color: var(--text-muted); flex-shrink: 0; text-align: right;
}

/* ============================================================
   DESIGN — FORM CARDS
   ============================================================ */
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 0.75rem;
  box-shadow: var(--shadow); overflow: hidden;
}
.card-header {
  padding: 0.8rem 1.1rem; cursor: pointer; display: flex;
  justify-content: space-between; align-items: center; user-select: none; transition: background 0.15s;
}
.card-header:hover { background: var(--accent-light); }
.card-title { font-weight: 600; font-size: 0.88rem; color: var(--text); }
.card-toggle { font-size: 1.1rem; color: var(--text-muted); font-weight: 300; width: 20px; text-align: center; }
.card-body { padding: 0.1rem 1.1rem 0.8rem; border-top: 1px solid var(--border); }

/* ============================================================
   DESIGN — FORM ELEMENTS
   ============================================================ */
.form-group { margin-top: 0.65rem; }
.form-group label { display: block; font-size: 0.76rem; font-weight: 500; color: var(--text-secondary); margin-bottom: 0.2rem; }
.form-group input[type="text"],
.form-group input[type="number"],
.form-group select,
.form-group textarea {
  width: 100%; padding: 0.5rem 0.7rem; font-size: 0.83rem; font-family: var(--font);
  color: var(--text); background: var(--bg-input); border: 1px solid var(--border);
  border-radius: var(--radius-sm); transition: border-color 0.15s, box-shadow 0.15s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--border-focus); box-shadow: 0 0 0 3px rgba(74,108,247,0.12);
}
.form-group textarea { resize: vertical; min-height: 55px; }

.form-group-checkbox { margin: 0; }
.checkbox-label {
  display: flex !important; align-items: center; gap: 0.35rem;
  font-size: 0.8rem !important; cursor: pointer; padding: 0.15rem 0;
  font-weight: 400 !important; color: var(--text) !important;
}
.checkbox-label input[type="checkbox"] { width: 15px; height: 15px; accent-color: var(--accent); cursor: pointer; margin: 0; }
.checkbox-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 0.05rem; margin: 0.35rem 0; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; }
@media (max-width: 600px) { .form-row { grid-template-columns: 1fr; } }
.form-section-label {
  font-size: 0.76rem; font-weight: 600; color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.05em; margin: 0.7rem 0 0.25rem;
  padding-top: 0.25rem; border-top: 1px dashed var(--border);
}

/* Marks & Percentages (unchanged from designer) */
.marks-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 0.5rem; margin: 0.35rem 0; }
@media (max-width: 600px) { .marks-grid { grid-template-columns: 1fr; } }
.marks-row { display: flex; align-items: center; gap: 0.4rem; background: var(--bg-input); padding: 0.45rem 0.6rem; border-radius: var(--radius-sm); border: 1px solid var(--border); }
.marks-label { font-size: 0.8rem; font-weight: 500; flex: 1; }
.marks-input { width: 55px !important; text-align: center; padding: 0.25rem !important; }
.marks-unit { font-size: 0.73rem; color: var(--text-muted); min-width: 30px; }

#percent-container { background: var(--bg-input); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0.5rem 0.7rem; margin: 0.35rem 0; }
.percent-row { display: flex; align-items: center; gap: 0.5rem; margin: 0.25rem 0; }
.percent-label { font-size: 0.8rem; font-weight: 500; min-width: 55px; }
.percent-slider { flex: 1; height: 4px; -webkit-appearance: none; appearance: none; background: var(--border); border-radius: 3px; outline: none; cursor: pointer; }
.percent-slider::-webkit-slider-thumb { -webkit-appearance: none; width: 14px; height: 14px; border-radius: 50%; background: var(--accent); cursor: pointer; border: 2px solid #fff; box-shadow: 0 1px 3px rgba(0,0,0,0.15); }
.percent-slider::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: var(--accent); cursor: pointer; border: 2px solid #fff; }
.percent-input { width: 50px !important; text-align: center; padding: 0.2rem !important; }
.percent-sign { font-size: 0.76rem; color: var(--text-muted); min-width: 12px; }
.percent-total { text-align: right; font-size: 0.76rem; font-weight: 500; color: var(--text-secondary); margin-top: 0.25rem; padding-top: 0.25rem; border-top: 1px solid var(--border); }
.percent-total span { font-weight: 700; }

/* ============================================================
   v3.0.0 — Quick Start Bar, Additional Instructions
   ============================================================ */
.quickstart-bar {
  display: flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.5rem 1rem; margin-bottom: 0.75rem;
  background: linear-gradient(135deg, var(--accent-light), #e0e7ff);
  border: 1px solid var(--accent);
  border-radius: var(--radius); font-size: 0.82rem; font-weight: 500;
  color: var(--accent);
}
.quickstart-step { white-space: nowrap; }
.quickstart-arrow { color: var(--text-muted); font-size: 1rem; }

/* Additional Instructions textarea */
.ai-helper-text {
  font-size: 0.82rem; color: var(--text-secondary);
  margin-bottom: 0.5rem; line-height: 1.5;
}
.ai-textarea {
  width: 100%; min-height: 100px; padding: 0.65rem 0.8rem;
  font-size: 0.85rem; font-family: var(--font);
  color: var(--text); background: #fffdf5;
  border: 1px solid #d4c89a; border-radius: var(--radius-sm);
  resize: vertical; line-height: 1.6;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.ai-textarea:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(74,108,247,0.12);
}

/* Simplified difficulty grid (replaces slider+number dual) */
.diff-grid {
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 0.5rem;
  margin: 0.35rem 0; padding: 0.5rem 0.7rem;
  background: var(--bg-input); border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
@media (max-width: 600px) { .diff-grid { grid-template-columns: 1fr; } }
.diff-item {
  display: flex; align-items: center; gap: 0.35rem;
  justify-content: center;
}
.diff-label { font-size: 0.8rem; font-weight: 500; min-width: 40px; }
.diff-input {
  width: 55px !important; text-align: center;
  padding: 0.3rem 0.25rem !important;
}
.diff-sign { font-size: 0.76rem; color: var(--text-muted); min-width: 12px; }
.diff-total-wrap {
  grid-column: 1 / -1; text-align: right;
  font-size: 0.76rem; font-weight: 500; color: var(--text-secondary);
  padding-top: 0.25rem; border-top: 1px solid var(--border);
  margin-top: 0.1rem;
}
.diff-total-wrap span { font-weight: 700; }

/* Helper text used in advanced sections */
.fp-helper {
  font-size: 0.78rem; color: var(--text-muted);
  margin: 0.25rem 0 0.3rem; line-height: 1.4;
}

/* ============================================================
   VALIDATE TAB
   ============================================================ */
.validate-content { max-width: 1000px; margin: 0 auto; padding: 1.5rem; }

.input-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.75rem; flex-wrap: wrap; gap: 0.5rem; }
.input-header h2 { font-size: 1rem; font-weight: 600; }
.input-actions { display: flex; gap: 0.4rem; flex-wrap: wrap; }

.sample-selector { margin-bottom: 0.8rem; }
.sample-selector select { width: 100%; padding: 0.45rem 0.7rem; font-size: 0.83rem; font-family: var(--font); border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--bg-card); cursor: pointer; }

.input-textarea {
  width: 100%; min-height: 320px; padding: 0.8rem; font-size: 0.8rem; font-family: var(--font-mono);
  border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--bg-card);
  resize: vertical; line-height: 1.6;
}
.input-textarea:focus { outline: none; border-color: var(--border-focus); box-shadow: 0 0 0 3px rgba(74,108,247,0.12); }

.results-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.8rem; flex-wrap: wrap; gap: 0.5rem; }
.results-header h2 { font-size: 1rem; font-weight: 600; }

.overall-banner {
  padding: 0.8rem 1.2rem; border-radius: var(--radius); font-size: 1.05rem; font-weight: 700;
  margin-bottom: 0.8rem; text-align: center;
}
.overall-banner.ready { background: #e8f5e9; color: #2e7d32; border: 1px solid #c8e6c9; }
.overall-banner.not-ready { background: #fbe9e7; color: #c62828; border: 1px solid #ffccbc; }
.banner-icon { font-size: 1.2rem; margin-right: 0.4rem; }

.stats-row {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 0.4rem; margin-bottom: 0.8rem;
}
.stat-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0.5rem 0.7rem; text-align: center; }
.stat-label { font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.stat-value { font-size: 1.2rem; font-weight: 700; color: var(--text); }
.stat-value.stat-critical { color: var(--red); }
.stat-value.stat-high { color: var(--orange); }
.stat-value.stat-medium { color: #e65100; }
.stat-value.stat-low { color: var(--accent); }

.results-list { margin-bottom: 0.8rem; }
.result-item {
  padding: 0.5rem 0.7rem; border-radius: var(--radius-sm); margin-bottom: 0.25rem;
  border-left: 3px solid var(--border); background: var(--bg-card);
  font-size: 0.83rem; line-height: 1.5;
}
.result-item.result-critical { border-left-color: var(--red); background: #fff5f5; }
.result-item.result-high { border-left-color: var(--orange); background: #fff8e1; }
.result-item.result-medium { border-left-color: #e65100; background: #fff3e0; }
.result-item.result-low { border-left-color: var(--accent); }
.result-item.result-pass { border-left-color: var(--green); background: #f1f8e9; }
.severity-icon { font-weight: 700; margin-right: 0.25rem; }
.result-critical .severity-icon { color: var(--red); }
.result-high .severity-icon { color: var(--orange); }
.result-medium .severity-icon { color: #e65100; }
.result-low .severity-icon { color: var(--accent); }
.result-pass .severity-icon { color: var(--green); }
.result-rule { font-weight: 600; color: var(--text-muted); margin-right: 0.25rem; }
.result-location { display: block; font-size: 0.76rem; color: var(--text-muted); margin-top: 0.15rem; }
.result-suggestion { font-size: 0.78rem; color: var(--accent); margin-top: 0.15rem; padding: 0.25rem 0.4rem; background: var(--accent-light); border-radius: 3px; }

.repair-section { margin-top: 1.2rem; padding-top: 1.2rem; border-top: 2px solid var(--border); }
.repair-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.6rem; flex-wrap: wrap; gap: 0.5rem; }
.repair-header h3 { font-size: 0.9rem; font-weight: 600; }
.repair-textarea {
  width: 100%; min-height: 220px; padding: 0.8rem; font-size: 0.8rem; font-family: var(--font-mono);
  border: 1px solid var(--border); border-radius: var(--radius-sm); background: #fafafa;
  resize: vertical; line-height: 1.6; color: #333;
}
.btn-copied { background: var(--green) !important; color: #fff !important; border-color: var(--green) !important; }

/* ============================================================
   EXPORT TAB (placeholder)
   ============================================================ */
.export-content { max-width: 600px; margin: 0 auto; padding: 3rem 1.5rem; text-align: center; }
.export-icon { font-size: 3rem; margin-bottom: 1rem; }
.export-content h2 { font-size: 1.2rem; font-weight: 600; margin-bottom: 0.5rem; }
.export-content p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 1rem; line-height: 1.6; }

/* ============================================================
   SCROLLBAR
   ============================================================ */
.preview-textarea::-webkit-scrollbar, .input-textarea::-webkit-scrollbar,
.repair-textarea::-webkit-scrollbar { width: 5px; }
.preview-textarea::-webkit-scrollbar-track, .input-textarea::-webkit-scrollbar-track,
.repair-textarea::-webkit-scrollbar-track { background: transparent; }
.preview-textarea::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 3px; }
.input-textarea::-webkit-scrollbar-thumb, .repair-textarea::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 600px) {
  .app-header { padding: 0.6rem 1rem; flex-wrap: wrap; gap: 0.4rem; }
  .tab-btn { padding: 0.5rem 0.8rem; font-size: 0.8rem; }
  .tab-btn .tab-label { display: none; }
  .validate-content { padding: 1rem; }
  .design-form { padding: 1rem; }
  .stats-row { grid-template-columns: repeat(3, 1fr); }
  .checkbox-grid { grid-template-columns: 1fr; }
}