/* ============================================
   Shared Base Styles
   ============================================ */

/* ---- CSS Variables ---- */
:root {
  --bg-primary:   #f4f5f7;
  --bg-secondary: #ffffff;
  --bg-tertiary:  #e2e8f0;
  --text-primary:   #0f172a;
  --text-secondary: #475569;
  --text-muted:     #64748b;
  --accent:         #2491b6;
  --glass-bg:       rgba(255,255,255,0.6);
  --glass-border:   rgba(255,255,255,0.4);
  --glass-shadow:   0 8px 32px rgba(0,0,0,0.08);
}

[data-theme="dark"] {
  --bg-primary:   #0a0a0a;
  --bg-secondary: #0f172a;
  --bg-tertiary:  #1e293b;
  --text-primary:   #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted:     #64748b;
  --accent:         #2bb3e0;
  --glass-bg:       rgba(15,23,42,0.55);
  --glass-border:   rgba(255,255,255,0.08);
  --glass-shadow:   0 8px 32px rgba(0,0,0,0.4);
}

/* ---- Base ---- */
html {
  scroll-behavior: auto;
}

body {
  overflow-x: hidden;
  background: var(--bg-primary);
  color: var(--text-primary);
}

::selection {
  background: rgba(36,145,182,0.3);
  color: inherit;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* ---- Glassmorphism Utilities ---- */
.glass-nav {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(1.6);
  -webkit-backdrop-filter: blur(20px) saturate(1.6);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
}

.glass-card:hover {
  border-color: rgba(36,145,182,0.3);
  box-shadow: 0 12px 40px rgba(36,145,182,0.12);
}

.glass-icon {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  transition: all .2s ease;
}

.glass-btn {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
}

.glass-badge {
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
  transition: all .25s ease;
  cursor: pointer;
}

.glass-badge:hover,
.glass-badge.unlocked {
  background: rgba(36,145,182,0.15);
  border-color: rgba(36,145,182,0.4);
  color: var(--accent);
  box-shadow: 0 0 20px rgba(36,145,182,0.15);
}

.glass-sidebar {
  background: var(--glass-bg);
  backdrop-filter: blur(24px) saturate(1.6);
  -webkit-backdrop-filter: blur(24px) saturate(1.6);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

/* ---- Form Floating Labels ---- */
.form-input:focus ~ .form-label,
.form-input:not(:placeholder-shown) ~ .form-label {
  top: -1.25rem;
  font-size: 0.75rem;
  color: var(--accent);
}