:root {
  --primary: #1e3a8a;
  --primary-dark: #172e6b;
  --primary-light: #dbeafe;
  --success: #16a34a;
  --danger: #dc2626;
  --warning: #d97706;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --bg: #f1f5f9;
  --card-bg: #ffffff;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.05);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container { width: 100%; max-width: 860px; margin: 0 auto; padding: 0 16px; }

/* ===== Header ===== */
.site-header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand { display: flex; flex-direction: column; align-items: flex-start; gap: 2px; }
.brand-logo { height: 30px; width: auto; }
.brand-text { font-weight: 700; font-size: 15px; }

@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .3; } }

/* ===== Progress ===== */
.progress-wrap { padding: 20px 0 8px; }
.progress-info { display: flex; justify-content: space-between; font-size: 13px; font-weight: 600; color: var(--text-muted); margin-bottom: 6px; }
.progress-info #progress-percent { color: var(--primary); }
.progress-bar { height: 10px; background: var(--primary-light); border-radius: 999px; overflow: hidden; }
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), #3b82f6);
  border-radius: 999px;
  transition: width .4s ease;
  width: 0;
}

/* ===== Card & Layout ===== */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin: 16px 0;
}
.section-title { font-size: 20px; font-weight: 700; margin-bottom: 4px; }
.section-subtitle { color: var(--text-muted); font-size: 14px; margin-bottom: 20px; }
.section-icon {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-weight: 700;
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 8px;
  letter-spacing: .5px;
  text-transform: uppercase;
}

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 600px) { .grid { grid-template-columns: 1fr; } }

/* ===== Field ===== */
.field { margin-bottom: 4px; }
.field label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.field .req { color: var(--danger); }
.field input[type="text"],
.field input[type="email"],
.field input[type="number"],
.field input[type="date"],
.field input[type="file"],
.field select,
.field textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  background: #fff;
  color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}
.field textarea { min-height: 90px; resize: vertical; }
.field.invalid input, .field.invalid select, .field.invalid textarea {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(220,38,38,.1);
}
.error-msg { color: var(--danger); font-size: 12px; margin-top: 4px; min-height: 0; display: none; }
.field.invalid .error-msg { display: block; }

/* Option list (radio/checkbox) */
.option-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 2px; }
.option-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 14px;
  font-size: 14px;
  cursor: pointer;
  background: #fff;
  transition: all .15s;
  user-select: none;
}
.option-item:hover { border-color: var(--primary); background: var(--primary-light); }
.option-item input { accent-color: var(--primary); width: 16px; height: 16px; }

/* ===== Module selection ===== */
.module-list { display: flex; flex-direction: column; gap: 10px; }
.module-item {
  display: block;
  cursor: pointer;
  position: relative;
}
.module-item > input { position: absolute; opacity: 0; pointer-events: none; }
.module-box {
  display: flex;
  align-items: center;
  gap: 14px;
  border: 2px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  transition: all .15s;
  background: #fff;
}
.module-item > input:checked + .module-box {
  border-color: var(--primary);
  background: var(--primary-light);
}
.module-box:hover { border-color: var(--primary); }
.module-icon {
  flex: 0 0 auto;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .5px;
}
.module-text { display: flex; flex-direction: column; }
.module-text strong { font-size: 15px; }
.module-text small { color: var(--text-muted); font-size: 13px; }

.module-sub {
  margin-left: 34px;
  padding-left: 18px;
  border-left: 2px dashed var(--border);
  display: flex;
  flex-direction: column;
  gap: 10px;
  animation: slideDown .25s ease;
}
.module-item.sub .module-box { padding: 10px 14px; }
.module-item.sub .module-icon { width: 36px; height: 36px; font-size: 11px; background: var(--primary-dark); }

.module-error { display: none; color: var(--danger); font-size: 13px; margin-top: 10px; font-weight: 600; }
.module-error.show { display: block; }

/* ===== Animations ===== */
.page { animation: fadeIn .3s ease; }
.section-card { animation: fadeIn .35s ease; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== Buttons ===== */
.actions { display: flex; gap: 10px; margin-top: 24px; flex-wrap: wrap; }
.btn {
  padding: 11px 22px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: all .15s;
}
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-danger { background: transparent; color: var(--danger); border: 1px solid var(--danger); }
.btn-danger:hover { background: var(--danger); color: #fff; }

/* ===== Answer preview ===== */
.preview-group { margin-bottom: 22px; }
.preview-group h4 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--primary);
  margin-bottom: 8px;
  border-bottom: 2px solid var(--primary-light);
  padding-bottom: 8px;
}
.preview-table { width: 100%; font-size: 14px; border-collapse: collapse; }
.preview-table td { padding: 7px 10px 7px 0; vertical-align: top; border-bottom: 1px solid var(--border); }
.preview-table tr:last-child td { border-bottom: none; }
.preview-table td:first-child { color: var(--text-muted); width: 38%; }
.preview-table td:last-child { font-weight: 600; word-break: break-word; }

.submit-status {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
  border: 1px solid transparent;
  display: none;
}
.submit-status.ok {
  color: #166534;
  background: #f0fdf4;
  border-color: #bbf7d0;
  display: block;
}
.submit-status.fail {
  color: #b91c1c;
  background: #fef2f2;
  border-color: #fecaca;
  display: block;
}
.pdf-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 16px;
  background: var(--primary);
  color: #fff;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 700;
}
.pdf-download:hover { background: var(--primary-dark); }

/* ===== Footer ===== */
.site-footer {
  margin-top: auto;
  text-align: center;
  color: var(--text-muted);
  font-size: 12px;
  padding: 20px 0;
}

/* ===== Mobile Responsive ===== */
@media (max-width: 768px) {
  .container { padding: 0 12px; }
  .card { padding: 18px 14px; }
  .section-title { font-size: 18px; }
}

@media (max-width: 480px) {
  html { -webkit-text-size-adjust: 100%; }
  body { font-size: 15px; }
  .header-inner { height: 54px; gap: 8px; }
  .brand-text { font-size: 13px; }
  .brand-badge { font-size: 12px; padding: 5px 8px; }

  .progress-wrap { padding: 14px 0 6px; }
  .progress-bar { height: 8px; }

  .grid { gap: 12px; }
  .field input[type="text"],
  .field input[type="email"],
  .field input[type="number"],
  .field input[type="date"],
  .field input[type="file"],
  .field select,
  .field textarea { padding: 11px 12px; font-size: 16px; }

  .module-box { padding: 12px 12px; gap: 12px; }
  .module-icon { width: 40px; height: 40px; font-size: 12px; }
  .module-text strong { font-size: 14px; }
  .module-text small { font-size: 12px; }
  .module-sub { margin-left: 10px; padding-left: 12px; }
  .module-item.sub .module-box { padding: 10px 12px; }

  .option-item {
    flex: 1 1 100%;
    justify-content: flex-start;
    padding: 12px 14px;
    font-size: 15px;
  }
  .option-item input { width: 18px; height: 18px; }

  .actions { flex-direction: column; }
  .actions .btn { width: 100%; padding: 13px 20px; font-size: 15px; }

  .preview-table td { display: block; width: 100%; padding: 4px 0; border-bottom: none; }
  .preview-table td:first-child { width: 100%; font-size: 13px; }
  .preview-table td:last-child { margin-bottom: 8px; }

  .submit-status { font-size: 13px; }
}