/* ===================================================
   Assessment Pages — Shared Styles
   Matches surgeflashcards.com landing page design system
   =================================================== */

:root {
  --bg: #FAFBFC;
  --bg-alt: #F1F5F9;
  --bg-dark: #0F172A;
  --bg-dark-lighter: #1E293B;
  --text-primary: #0F172A;
  --text-body: #334155;
  --text-secondary: #64748B;
  --text-on-dark: #FFFFFF;
  --text-on-dark-muted: rgba(255,255,255,0.7);
  --accent: #7C3AED;
  --accent-hover: #6D28D9;
  --accent-light: rgba(124,58,237,0.1);
  --blue: #3B82F6;
  --green: #10B981;
  --red: #EF4444;
  --amber: #F59E0B;
  --card: #FFFFFF;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --max-width: 1200px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text-body);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== NAV ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 24px;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
}
.nav.scrolled {
  padding: 12px 24px;
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}
.nav-logo img {
  height: 48px;
  width: auto;
}
.nav.scrolled .nav-logo img {
  height: 44px;
}
.footer-brand .nav-logo img {
  height: 64px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--text-primary); }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.nav-signin {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
}
.nav-signin:hover { color: var(--text-primary); }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 100px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--blue));
  color: white;
  box-shadow: 0 4px 15px rgba(124,58,237,0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(124,58,237,0.4);
}
.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.btn-outline:hover {
  background: var(--accent-light);
}
.btn-lg { padding: 14px 36px; font-size: 16px; }
.btn-xl { padding: 18px 48px; font-size: 18px; }

/* ===== HAMBURGER & MOBILE MENU ===== */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  right: -100%;
  width: 300px;
  height: 100vh;
  background: white;
  z-index: 1001;
  padding: 80px 32px 32px;
  box-shadow: var(--shadow-xl);
  transition: right var(--transition);
  flex-direction: column;
  gap: 8px;
}
.mobile-menu.open { right: 0; }
.mobile-menu a {
  display: block;
  padding: 12px 0;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-body);
  border-bottom: 1px solid var(--bg-alt);
}
.mobile-menu a:hover { color: var(--accent); }
.mobile-menu .btn { margin-top: 16px; text-align: center; }
.mobile-menu-close {
  position: absolute;
  top: 24px;
  right: 24px;
  background: none;
  border: none;
  font-size: 28px;
  cursor: pointer;
  color: var(--text-secondary);
  line-height: 1;
}
.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 1000;
  opacity: 0;
  transition: opacity var(--transition);
}
.mobile-overlay.open { opacity: 1; }

/* ===== CARDS (replace glassmorphism) ===== */
.glass-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(0,0,0,0.06);
  padding: 2rem;
}

/* ===== SECTION HEADERS ===== */
.section-header {
  text-align: center;
  margin-bottom: 2rem;
}
.section-header h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}
.section-header p {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* ===== PAGE CONTENT (spacing from fixed nav) ===== */
.page-content {
  padding-top: 100px;
  padding-bottom: 64px;
}
.page-content .container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* ===== FOOTER ===== */
.footer {
  background: var(--bg-dark);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 64px 24px 32px;
  color: var(--text-on-dark-muted);
}
.footer-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
  margin-top: 12px;
  color: var(--text-on-dark-muted);
  max-width: 280px;
}
.footer h4 {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: rgba(255,255,255,0.4);
  margin-bottom: 16px;
}
.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links a {
  font-size: 14px;
  color: var(--text-on-dark-muted);
  transition: color var(--transition);
}
.footer-links a:hover { color: white; }
.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.06);
  text-align: center;
  font-size: 13px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-actions { display: none; }
  .hamburger { display: flex; }
  .mobile-menu { display: flex; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .page-content { padding-top: 80px; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
}