/* ─── Reset & Base ──────────────────────────────────────────── */

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

:root {
  --primary: #7c3aed;
  --primary-light: #8b5cf6;
  --primary-dark: #6d28d9;
  --primary-bg: #f5f3ff;
  --success: #10b981;
  --success-bg: #ecfdf5;
  --error: #ef4444;
  --error-bg: #fef2f2;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --white: #ffffff;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 6px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--primary-dark);
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ─── Navbar ───────────────────────────────────────────────── */

.navbar {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--gray-900);
  text-decoration: none;
}

.brand-icon {
  font-size: 1.4rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 8px 16px;
  border-radius: var(--radius-xs);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--gray-600);
  transition: all 0.2s;
}

.nav-link:hover {
  background: var(--gray-100);
  color: var(--gray-900);
}

.nav-register {
  background: var(--primary);
  color: var(--white) !important;
}

.nav-register:hover {
  background: var(--primary-dark);
}

.nav-user {
  font-size: 0.9rem;
  color: var(--gray-500);
  padding: 0 8px;
}

.nav-logout {
  color: var(--gray-400);
  font-size: 0.85rem;
}

/* ─── Main Content ─────────────────────────────────────────── */

.main-content {
  flex: 1;
  padding: 40px 0;
}

/* ─── Buttons ──────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  border: none;
  border-radius: var(--radius-xs);
  font-size: 0.95rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-outline:hover {
  background: var(--primary-bg);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--gray-500);
}

.btn-ghost:hover {
  background: var(--gray-100);
  color: var(--gray-700);
}

.btn-full {
  width: 100%;
  justify-content: center;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.85rem;
}

.btn-reply-toggle {
  margin-top: 12px;
  color: var(--primary);
  background: var(--primary-bg);
  border: 1px solid var(--primary);
}

.btn-reply-toggle:hover {
  background: var(--primary);
  color: var(--white);
}

/* ─── Alerts ───────────────────────────────────────────────── */

.alert {
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  font-size: 0.9rem;
  font-weight: 500;
}

.alert-error {
  background: var(--error-bg);
  color: var(--error);
  border: 1px solid #fecaca;
}

.alert-success {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid #a7f3d0;
}

/* ─── Hero Section ─────────────────────────────────────────── */

.hero {
  display: flex;
  align-items: center;
  gap: 60px;
  padding: 60px 0;
}

.hero-content {
  flex: 1;
}

.hero-title {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--gray-900);
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--gray-500);
  line-height: 1.7;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 12px;
}

.hero-illustration {
  flex: 0 0 300px;
}

.hero-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  border: 1px solid var(--gray-200);
}

.hero-card-header {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--white);
  padding: 14px 20px;
  font-weight: 600;
  font-size: 0.9rem;
}

.hero-card-body {
  padding: 20px;
}

.hero-question {
  background: var(--gray-100);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  margin-bottom: 12px;
  position: relative;
}

.hero-answer {
  background: var(--primary-bg);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  color: var(--primary-dark);
  border-left: 3px solid var(--primary);
}

/* ─── Features ─────────────────────────────────────────────── */

.features {
  padding: 40px 0 60px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--white);
  padding: 32px 24px;
  border-radius: var(--radius);
  text-align: center;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--gray-900);
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--gray-500);
  line-height: 1.6;
}

/* ─── Auth Pages ───────────────────────────────────────────── */

.auth-page {
  display: flex;
  justify-content: center;
  padding: 40px 0;
}

.auth-card {
  background: var(--white);
  padding: 40px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  width: 100%;
  max-width: 420px;
}

.auth-card h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.auth-desc {
  color: var(--gray-500);
  font-size: 0.9rem;
  margin-bottom: 28px;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.auth-footer {
  text-align: center;
  margin-top: 24px;
  font-size: 0.9rem;
  color: var(--gray-500);
}

/* ─── Forms ────────────────────────────────────────────────── */

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray-700);
}

.form-group input,
.form-group textarea {
  padding: 10px 14px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-xs);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
  background: var(--white);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}

/* ─── Dashboard ────────────────────────────────────────────── */

.dash-header {
  margin-bottom: 32px;
}

.dash-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.dash-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.stat-card {
  background: var(--white);
  padding: 20px;
  border-radius: var(--radius-sm);
  text-align: center;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
}

.stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--gray-500);
}

.dash-section {
  margin-bottom: 32px;
}

.dash-section h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--gray-800);
}

.inbox-link-box {
  display: flex;
  gap: 8px;
  align-items: center;
}

.inbox-link-box input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-xs);
  font-size: 0.9rem;
  font-family: monospace;
  background: var(--gray-50);
  color: var(--gray-700);
}

/* ─── Questions List ───────────────────────────────────────── */

.questions-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.question-card {
  background: var(--white);
  padding: 20px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  border-left: 4px solid var(--gray-300);
}

.question-card.unanswered {
  border-left-color: var(--primary);
}

.question-card.answered {
  border-left-color: var(--success);
}

.q-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.q-badge {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 20px;
}

.badge-pending {
  background: var(--primary-bg);
  color: var(--primary);
}

.badge-answered {
  background: var(--success-bg);
  color: var(--success);
}

.q-date {
  font-size: 0.8rem;
  color: var(--gray-400);
}

.q-content {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--gray-800);
}

.q-reply {
  margin-top: 16px;
  padding: 14px;
  background: var(--success-bg);
  border-radius: var(--radius-xs);
  border-left: 3px solid var(--success);
}

.reply-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--success);
}

.reply-text {
  margin-top: 6px;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--gray-700);
}

.reply-date {
  display: block;
  margin-top: 6px;
  font-size: 0.8rem;
  color: var(--gray-400);
}

.reply-form {
  margin-top: 12px;
}

.reply-form textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-xs);
  font-size: 0.9rem;
  font-family: inherit;
  resize: vertical;
  outline: none;
}

.reply-form textarea:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}

.reply-actions {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

/* ─── Empty State ──────────────────────────────────────────── */

.empty-state {
  text-align: center;
  padding: 60px 20px;
  background: var(--white);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 16px;
}

.empty-state p {
  font-size: 1rem;
  color: var(--gray-500);
}

.empty-hint {
  font-size: 0.85rem !important;
  color: var(--gray-400) !important;
  margin-top: 8px;
}

/* ─── Inbox Page ───────────────────────────────────────────── */

.inbox-page {
  max-width: 640px;
  margin: 0 auto;
}

.inbox-header {
  text-align: center;
  padding: 40px 0 32px;
}

.inbox-avatar {
  font-size: 3.5rem;
  margin-bottom: 12px;
}

.inbox-header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.inbox-desc {
  font-size: 1rem;
  color: var(--gray-500);
}

.ask-section {
  background: var(--white);
  padding: 28px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  margin-bottom: 32px;
}

.ask-section h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.ask-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.ask-form textarea {
  width: 100%;
  padding: 14px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  resize: vertical;
  outline: none;
  transition: border-color 0.2s;
}

.ask-form textarea:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}

.qa-section h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.qa-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.qa-item {
  background: var(--white);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  overflow: hidden;
}

.qa-question,
.qa-reply {
  display: flex;
  gap: 14px;
  padding: 18px 20px;
}

.qa-question {
  border-bottom: 1px solid var(--gray-100);
}

.qa-icon {
  flex-shrink: 0;
  font-size: 1.2rem;
  padding-top: 2px;
}

.qa-body {
  flex: 1;
}

.qa-text {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--gray-800);
}

.qa-text.reply {
  color: var(--primary-dark);
}

.qa-meta {
  font-size: 0.78rem;
  color: var(--gray-400);
  margin-top: 4px;
}

/* ─── Error Page ───────────────────────────────────────────── */

.error-page {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 50vh;
}

.error-content {
  text-align: center;
}

.error-content h1 {
  font-size: 5rem;
  font-weight: 800;
  color: var(--gray-300);
  line-height: 1;
}

.error-content p {
  font-size: 1.1rem;
  color: var(--gray-500);
  margin: 16px 0 32px;
}

/* ─── Footer ───────────────────────────────────────────────── */

.footer {
  text-align: center;
  padding: 24px 0;
  border-top: 1px solid var(--gray-200);
  margin-top: 40px;
}

.footer p {
  font-size: 0.85rem;
  color: var(--gray-400);
}

/* ─── Responsive ───────────────────────────────────────────── */

@media (max-width: 768px) {
  .hero {
    flex-direction: column;
    gap: 32px;
    padding: 40px 0;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-illustration {
    flex: 0 0 auto;
    width: 100%;
    max-width: 320px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .dash-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
  }

  .stat-card {
    padding: 14px 10px;
  }

  .stat-number {
    font-size: 1.5rem;
  }

  .inbox-link-box {
    flex-direction: column;
    align-items: stretch;
  }

  .auth-card {
    padding: 28px 24px;
  }

  .qa-question,
  .qa-reply {
    padding: 14px 16px;
  }
}

@media (max-width: 480px) {
  .dash-stats {
    gap: 8px;
  }

  .stat-card {
    padding: 12px 8px;
  }

  .stat-number {
    font-size: 1.3rem;
  }

  .q-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}