/* =========================
   Student Planner - style.css
   Professional layout + consistent styling
   ========================= */

/* CSS Variables for theme */
:root {
    --bg: #f5f7fb;
    --card: #ffffff;
    --text: #0f172a;
    --muted: #64748b;
    --border: #e2e8f0;
  
    --primary: #2563eb;
    --primary-2: #1d4ed8;
    --secondary: #0ea5e9;
  
    --danger: #ef4444;
    --warning: #f59e0b;
    --success: #22c55e;
  
    --shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
    --radius: 14px;
  }
  
  /* Dark theme overrides */
  body.dark {
    --bg: #0b1220;
    --card: #0f1b33;
    --text: #e5e7eb;
    --muted: #94a3b8;
    --border: rgba(148, 163, 184, 0.22);
  
    --shadow: 0 10px 25px rgba(0, 0, 0, 0.35);
  }
  
  * { box-sizing: border-box; }
  
  body {
    margin: 0;
    font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
  }
  
  /* Container */
  .container {
    width: min(1100px, 92%);
    margin: 0 auto;
  }
  
  /* Navbar */
  .navbar {
    position: sticky;
    top: 0;
    z-index: 5;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
  }
  body.dark .navbar {
    background: rgba(15, 27, 51, 0.65);
  }
  
  .nav-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 0;
  }
  
  .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    user-select: none;
  }
  .brand-dot {
    width: 12px;
    height: 12px;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
  }
  .brand-title {
    font-weight: 800;
    letter-spacing: 0.2px;
  }
  
  .nav-links {
    display: flex;
    align-items: center;
    gap: 14px;
  }
  .nav-links a {
    text-decoration: none;
    color: var(--muted);
    padding: 8px 10px;
    border-radius: 10px;
  }
  .nav-links a:hover {
    color: var(--text);
    background: rgba(37, 99, 235, 0.10);
  }
  .nav-links a.active {
    color: var(--text);
    background: rgba(37, 99, 235, 0.14);
  }
  
  /* Cards */
  .card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 18px;
    margin: 18px 0;
  }
  
  /* Buttons */
  .btn {
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text);
    padding: 10px 14px;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 650;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: transform 0.05s ease, background 0.15s ease, border 0.15s ease;
  }
  .btn:active { transform: translateY(1px); }
  
  .btn-primary {
    background: var(--primary);
    border-color: transparent;
    color: #fff;
  }
  .btn-primary:hover { background: var(--primary-2); }
  
  .btn-secondary {
    background: rgba(14, 165, 233, 0.12);
    border-color: rgba(14, 165, 233, 0.35);
  }
  .btn-secondary:hover {
    background: rgba(14, 165, 233, 0.20);
  }
  
  .btn-ghost:hover {
    background: rgba(100, 116, 139, 0.12);
  }
  
  /* Typography helpers */
  h1, h2, h3 { margin: 0 0 10px; }
  .muted { color: var(--muted); }
  .small { font-size: 0.92rem; }
  
  /* Footer */
  .footer {
    border-top: 1px solid var(--border);
    padding: 16px 0;
    margin-top: 24px;
  }
  .footer-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    font-size: 0.95rem;
  }
  
  /* Hero */
  .hero {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 18px;
    align-items: center;
  }
  .hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 14px 0;
  }
  .hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-top: 12px;
  }
  .stat {
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 12px;
    background: rgba(37, 99, 235, 0.06);
  }
  .stat-num {
    font-size: 1.6rem;
    font-weight: 900;
  }
  .stat-label { color: var(--muted); font-size: 0.92rem; }
  
  .hero-preview .preview-card {
    border: 1px dashed rgba(100, 116, 139, 0.45);
    border-radius: 16px;
    padding: 16px;
    background: rgba(100, 116, 139, 0.08);
  }
  .preview-title { font-weight: 800; margin-bottom: 10px; }
  .preview-list { margin: 0; padding-left: 16px; }
  .preview-list li { margin: 8px 0; }
  .preview-footer { margin-top: 10px; color: var(--muted); font-size: 0.92rem; }
  
  .dot {
    display: inline-block;
    width: 10px; height: 10px;
    border-radius: 999px;
    margin-right: 8px;
  }
  .dot-green { background: var(--success); }
  .dot-yellow { background: var(--warning); }
  .dot-blue { background: var(--secondary); }
  
  /* Layout grids */
  .grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
  }
  .grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
  .card.inner {
    box-shadow: none;
    margin: 0;
  }
  
  /* Section header */
  .section-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 10px;
  }
  .pill {
    padding: 8px 12px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: rgba(37, 99, 235, 0.08);
    font-weight: 700;
  }
  
  /* Forms */
  .task-form { margin-top: 8px; }
  .form-group { margin: 12px 0; }
  label {
    display: block;
    font-weight: 750;
    margin-bottom: 6px;
  }
  input, select {
    width: 100%;
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text);
    outline: none;
  }
  input:focus, select:focus {
    border-color: rgba(37, 99, 235, 0.6);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
  }
  .help { color: var(--muted); }
  
  .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 12px;
  }
  .form-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
  }
  
  .message {
    margin-top: 10px;
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid transparent;
    display: none; /* shown via JS */
  }
  .message.success {
    display: block;
    border-color: rgba(34, 197, 94, 0.35);
    background: rgba(34, 197, 94, 0.12);
  }
  .message.error {
    display: block;
    border-color: rgba(239, 68, 68, 0.35);
    background: rgba(239, 68, 68, 0.12);
  }
  
  /* Controls */
  .controls {
    display: grid;
    grid-template-columns: 1.2fr 1fr 1fr 1fr;
    gap: 12px;
    align-items: end;
  }
  .control-group label { font-size: 0.95rem; }
  
  /* Progress */
  .progress-wrap {
    margin-top: 14px;
    border-top: 1px dashed rgba(100, 116, 139, 0.35);
    padding-top: 14px;
  }
  .progress-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
  }
  .badges { display: flex; gap: 8px; flex-wrap: wrap; }
  .badge {
    border: 1px solid var(--border);
    background: rgba(100, 116, 139, 0.10);
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 0.9rem;
  }
  .progress-bar {
    height: 12px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: rgba(100, 116, 139, 0.12);
    overflow: hidden;
    margin-top: 10px;
  }
  .progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    width: 0%;
  }
  
  /* Task List */
  .task-list {
    list-style: none;
    padding: 0;
    margin: 0;
  }
  .task-item {
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 12px;
    margin: 10px 0;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 12px;
    background: rgba(37, 99, 235, 0.04);
  }
  .task-main {
    display: grid;
    gap: 6px;
  }
  .task-title {
    font-weight: 850;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
  }
  .tag {
    font-size: 0.82rem;
    padding: 4px 10px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: rgba(100, 116, 139, 0.10);
    color: var(--muted);
  }
  .tag.high { background: rgba(239, 68, 68, 0.12); border-color: rgba(239, 68, 68, 0.28); }
  .tag.medium { background: rgba(245, 158, 11, 0.12); border-color: rgba(245, 158, 11, 0.30); }
  .tag.low { background: rgba(34, 197, 94, 0.12); border-color: rgba(34, 197, 94, 0.30); }
  
  .task-meta { color: var(--muted); font-size: 0.92rem; }
  .task-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  .btn-danger {
    border-color: rgba(239, 68, 68, 0.28);
    background: rgba(239, 68, 68, 0.12);
  }
  .btn-danger:hover {
    background: rgba(239, 68, 68, 0.18);
  }
  .btn-success {
    border-color: rgba(34, 197, 94, 0.30);
    background: rgba(34, 197, 94, 0.12);
  }
  .btn-success:hover {
    background: rgba(34, 197, 94, 0.18);
  }
  
  .task-item.done {
    opacity: 0.85;
    background: rgba(34, 197, 94, 0.06);
  }
  .task-item.done .task-title span.text {
    text-decoration: line-through;
    color: var(--muted);
  }
  
  /* Simple table */
  .table-wrap { overflow-x: auto; }
  .simple-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
  }
  .simple-table th, .simple-table td {
    border: 1px solid var(--border);
    padding: 10px;
    text-align: left;
  }
  .simple-table th { background: rgba(37, 99, 235, 0.08); }
  
  /* Lists */
  .list { margin: 0; padding-left: 18px; }
  .list li { margin: 8px 0; }
  
  /* Responsive */
  @media (max-width: 900px) {
    .hero { grid-template-columns: 1fr; }
    .grid-3 { grid-template-columns: 1fr; }
    .grid-2 { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .controls { grid-template-columns: 1fr 1fr; }
  }
  
  @media (max-width: 520px) {
    .nav-wrap { flex-direction: column; align-items: flex-start; }
    .controls { grid-template-columns: 1fr; }
    .hero-stats { grid-template-columns: 1fr; }
  }