:root {
  --bg-primary: #F8F9FD;
  --bg-secondary: #FFFFFF;
  --bg-tertiary: #F1F3F9;
  --text-primary: #2D3436;
  --text-secondary: #636E72;
  --text-heading: #1E1E2D;
  --border-color: #E2E8F0;
  --shadow-color: rgba(0,0,0,0.08);
  --shadow-lg: 0 25px 50px rgba(108, 92, 231, 0.15);
  --card-bg: #FFFFFF;
  --navbar-bg: rgba(255,255,255,0.95);
  --footer-bg: #1E1E2D;
  --footer-text: rgba(255,255,255,0.7);
  --btn-ghost-border: #E2E8F0;
  --primary: #6C5CE7;
  --primary-dark: #5A4BD1;
  --secondary: #FF6B6B;
  --accent: #FFD93D;
  --green: #10B981;
  --input-bg: #F8F9FD;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-primary: #121218;
  --bg-secondary: #1E1E2D;
  --bg-tertiary: #252536;
  --text-primary: #E2E8F0;
  --text-secondary: #A0AEC0;
  --text-heading: #F7FAFC;
  --border-color: #2D2D3F;
  --shadow-color: rgba(0,0,0,0.4);
  --shadow-lg: 0 25px 50px rgba(108, 92, 231, 0.25);
  --card-bg: #1E1E2D;
  --navbar-bg: rgba(18, 18, 24, 0.95);
  --footer-bg: #0F0F1A;
  --footer-text: rgba(255,255,255,0.5);
  --btn-ghost-border: #2D2D3F;
  --input-bg: #252536;
}

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

body {
  font-family: 'Cairo', 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background 0.3s, color 0.3s;
}

.container {
  width: 90%;
  max-width: 1240px;
  margin: 0 auto;
}

.btn {
  padding: 0.7rem 1.8rem;
  border-radius: 50px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: 'Cairo', sans-serif;
}

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

.btn-ghost:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 4px 15px rgba(108, 92, 231, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(108, 92, 231, 0.5);
}

.theme-toggle {
  background: transparent;
  border: 2px solid var(--border-color);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  margin-right: 1rem;
  color: var(--text-primary);
}

.theme-toggle:hover {
  border-color: var(--primary);
  background: var(--bg-tertiary);
}