/* ===========================================
   StudyMate Suite — Glass Design System (Theme Update)
   Variables, Reset, Body, Utilities
   =========================================== */

/* ---------- Font: Inter ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ---------- Variables ---------- */
:root {
  /* Primary colors - Updated to vibrant palette */
  --primary: #7C3AED;          /* Purple đậm - thay Indigo */
  --primary-dark: #6D28C9;
  --primary-soft: #F3E8FF;     /* Pastel purple nhẹ */
  --primary-light: #DDD6FE;
  
  /* Success - Green tươi sáng hơn */
  --success: #22C55E;
  --success-soft: #DCFCE7;
  
  /* Warning - Amber vàng ấm */
  --warning: #F59E0B;
  --warning-soft: #FEF3C7;
  
  /* Danger - Red tươi */
  --danger: #EF4444;
  --danger-soft: #FEF2F2;
  
  /* Info - Blue pastel */
  --info: #3B82F6;
  --info-soft: #EFF6FF;
  
  /* Secondary - Teal tươi sáng */
  --secondary: #14B8A6;
  --secondary-soft: #E0F7FA;
  
  /* Text colors */
  --text: #0F172A;
  --text-secondary: #475569;
  --text-muted: #000102;
  
  /* Background - Pastel gradient base */
  --bg: #8aa2f8;              /* Pastel purple nhẹ */
  --surface: #FFFFFF;
  
  /* Card backgrounds - Màu nền riêng biệt cho từng loại thẻ */
  --card-bg: #FFFFFF;
  --card-bg-primary: #F3E8FF;   /* Thẻ thống kê - Tím pastel */
  --card-bg-success: #DCFCE7;   /* Thẻ thành công - Xanh lá pastel */
  --card-bg-warning: #FEF3C7;   /* Thẻ cảnh báo - Vàng kem pastel */
  --card-bg-danger: #FEF2F2;    /* Thẻ lỗi - Đỏ pastel */
  --card-bg-info: #DBEAFE;      /* Thẻ thông tin - Xanh dương pastel */
  --card-bg-secondary: #E0F7FA; /* Thẻ phụ - Teal pastel */
  
  /* Glass effect - Reduced blur for cleaner look */
  --glass-bg: rgba(255,255,255,0.85);
  --glass-bg-hover: rgba(255,255,255,0.95);
  --glass-border: rgba(226,232,240,0.7);
  --glass-border-hover: var(--primary-light);
  --card-bg: rgb(238, 186, 233);
  
  /* Radius & shadows */
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.08);
  
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
}

/* Ambient background blobs - Updated to purple/green theme */
body::before {
  content: '';
  position: fixed;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(124,58,237,0.12) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}
body::after {
  content: '';
  position: fixed;
  bottom: -15%;
  left: -5%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(34,197,94,0.08) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ---------- Container ---------- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; position: relative; z-index: 1; }
.container-sm { max-width: 900px; }

/* ---------- Glass Card ---------- */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.glass:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-md);
}

/* ---------- Typography ---------- */
.text-gradient {
  background: linear-gradient(135deg, var(--text), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- Section ---------- */
.section-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ---------- Grid ---------- */
.grid-auto { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-auto { grid-template-columns: 1fr; }
  .container { padding: 0 16px; }
}

/* ---------- Animations ---------- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
.anim-fade { animation: fadeIn 0.3s ease; }
.anim-up { animation: fadeInUp 0.35s ease; }

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

/* ==========================================
   Dark Mode (global) - Updated palette
   ========================================== */
body.dark-mode {
  --text: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --bg: #0f172a;
  --surface: rgba(30,41,59,0.6);
  --glass-bg: rgba(30,41,59,0.45);
  --glass-bg-hover: rgba(30,41,59,0.6);
  --glass-border: rgba(71,85,105,0.35);
  --glass-border-hover: rgba(124,58,237,0.3);
  --card-bg: rgba(30,41,59,0.5);
  --primary-soft: rgba(124,58,237,0.15);
  --success-soft: rgba(34,197,94,0.12);
  --warning-soft: rgba(245,158,11,0.12);
  --danger-soft: rgba(239,68,68,0.12);
  --info-soft: rgba(59,130,246,0.12);
  --secondary-soft: rgba(20,184,166,0.12);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.25);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.35);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.45);
}
body.dark-mode::before {
  background: radial-gradient(circle, rgba(124,58,237,0.18) 0%, transparent 70%);
}
body.dark-mode::after {
  background: radial-gradient(circle, rgba(34,197,94,0.10) 0%, transparent 70%);
}