/* Base styles for Prelumo tutoring marketplace */

/* Import Inter font from Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* CSS variables for theme colors.  The default theme is light (Aurora). */
:root {
  /* Light theme */
  --bg: #FFFFFF;
  --surface: #F8FAFC;
  --surface-2: #EEF2F6;
  --text: #0F172A;
  --muted: #64748B;
  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --accent: #0EA5E9;
  --success: #059669;
  --warning: #D97706;
  --danger: #DC2626;
  --border: #E2E8F0;
  --star: #F59E0B;
  --tier-gold: #F4B400;
  --tier-indigo: #4F46E5;
}

/* Dark theme overrides (Nebula) */
[data-theme="nebula"] {
  --bg: #0B0C10;
  --surface: #12131A;
  --surface-2: #171923;
  --text: #E8EAF2;
  --muted: #A7AEC0;
  --primary: #8B5CF6;
  --primary-hover: #7C3AED;
  --accent: #22D3EE;
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;
  --border: #262A36;
  --star: #F59E0B;
  --tier-gold: #F4C95D;
  --tier-indigo: #6366F1;
}

/* Global resets */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

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

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

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

header .nav-links a {
  margin-left: 1rem;
  font-weight: 500;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease;
  text-align: center;
}

.btn-primary {
  background-color: var(--primary);
  color: white;
  border: none;
}
.btn-primary:hover {
  background-color: var(--primary-hover);
}

.btn-secondary {
  background-color: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  background-color: var(--surface);
}

/* Sections */
section {
  padding: 2rem 1rem;
}

.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 60vh;
  background-size: cover;
  background-position: center;
  position: relative;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(rgba(0,0,0,0.3), rgba(0,0,0,0.6));
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: 2rem;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.feature-card {
  background-color: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.5rem;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.feature-card h3 {
  margin-top: 1rem;
  margin-bottom: 0.5rem;
  font-size: 1.25rem;
}

.feature-card p {
  color: var(--muted);
  font-size: 0.9rem;
}

/* Cards for tutors, companies */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card {
  background-color: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1rem;
  box-shadow: 0 4px 8px rgba(0,0,0,0.03);
  display: flex;
  flex-direction: column;
}

.card-header {
  display: flex;
  align-items: center;
  margin-bottom: 0.75rem;
}

.card-header img.avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  margin-right: 0.75rem;
  border: 3px solid var(--tier-indicator, var(--muted));
}

.card-header .name {
  font-weight: 600;
  font-size: 1.1rem;
}

.badge {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
  margin-left: 0.5rem;
  background-color: var(--surface);
  border: 1px solid var(--border);
}

.badge.tier1 {
  background-color: var(--surface);
  color: var(--muted);
}

.badge.tier2 {
  background-color: var(--tier-indigo);
  color: #fff;
}

.badge.tier3 {
  background-color: var(--tier-gold);
  color: #000;
}

.rating {
  display: flex;
  align-items: center;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.rating .stars {
  color: var(--star);
  margin-right: 0.25rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.tag {
  background-color: var(--surface);
  border: 1px solid var(--border);
  padding: 0.1rem 0.4rem;
  border-radius: 0.4rem;
  font-size: 0.7rem;
  color: var(--muted);
}

.card-footer {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.availability-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: 0.4rem;
  margin-top: 0.75rem;
}

.slot {
  padding: 0.25rem;
  text-align: center;
  border-radius: 0.25rem;
  background-color: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.8rem;
}
.slot.available {
  background-color: var(--success);
  color: white;
}
.slot.full {
  background-color: var(--danger);
  color: white;
}

/* Form styles */
form {
  max-width: 400px;
  margin: 2rem auto;
  background-color: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 2rem;
}

form h2 {
  margin-bottom: 1rem;
  text-align: center;
}

form .form-group {
  margin-bottom: 1rem;
}

form label {
  display: block;
  margin-bottom: 0.25rem;
  font-weight: 500;
}

form input[type="text"],
form input[type="email"],
form input[type="password"],
form select {
  width: 100%;
  padding: 0.5rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
  background-color: var(--surface);
  color: var(--text);
}

form .error {
  color: var(--danger);
  font-size: 0.8rem;
  margin-top: 0.25rem;
}

.theme-toggle {
  cursor: pointer;
  display: flex;
  align-items: center;
  margin-left: 1rem;
  background-color: var(--surface-2);
  padding: 0.3rem 0.6rem;
  border-radius: 0.5rem;
  font-size: 0.8rem;
  border: 1px solid var(--border);
}
.theme-toggle svg {
  margin-right: 0.3rem;
}

/* Footer */
footer {
  padding: 2rem 1rem;
  background-color: var(--surface);
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.9rem;
}

.footer-links a {
  margin: 0 0.5rem;
  color: var(--muted);
}
.footer-links a:hover {
  color: var(--primary);
}

@media (min-width: 768px) {
  .hero {
    flex-direction: row;
    text-align: left;
    padding: 4rem 2rem;
  }
  .hero-content {
    max-width: 50%;
  }
}