/* ── DARK MODE (default) ──────────────────────── */
  :root {
    --bg: #07090d;
    --surface: #181b22;
    --surface2: #1f2430;
    --border: #2b3240;
    --accent: #f2efeb;
    --accent2: #9a8cff;
    --accent3: #ff8ebc;
    --text: #f4f6fb;
    --text-muted: #adb3bf;
    --z1: #8ac5ff;
    --z2: #8de1b8;
    --z3: #ffd27e;
    --z4: #b69aff;
    --z5: #ff8ebc;
    --header-bg: rgba(7,9,13,0.94);
    --overlay-bg: rgba(6,8,12,0.72);
    --overlay-bg2: rgba(6,8,12,0.80);
    --row-border: rgba(74,86,108,0.45);
    --row-border2: rgba(74,86,108,0.35);
    --badge-future-bg: rgba(58,69,88,0.85);
    --badge-done-bg: rgba(141,225,184,0.14);
    --badge-next-bg: rgba(154,140,255,0.16);
    --alert-bg: rgba(255,142,188,0.10);
    --alert-border: rgba(255,142,188,0.28);
    --alert-ok-bg: rgba(141,225,184,0.10);
    --alert-ok-border: rgba(141,225,184,0.25);
    --filter-active-bg: rgba(154,140,255,0.15);
    --confirm-border: rgba(200,208,222,0.28);
    --shadow: 0 12px 40px rgba(0,0,0,0.45);
  }

  /* ── LIGHT MODE ────────────────────────────────── */
  [data-theme="light"] {
    --bg: #f1f3f8;
    --surface: #ffffff;
    --surface2: #f1f4fa;
    --border: #d9e0ec;
    --accent: #4d9eee;
    --accent2: #d96a74;
    --accent3: #d7a344;
    --text: #1b2533;
    --text-muted: #5c6f8a;
    --z1: #27b07c;
    --z2: #4d9eee;
    --z3: #d7a344;
    --z4: #8f73df;
    --z5: #d96a74;
    --header-bg: rgba(246,247,251,0.94);
    --overlay-bg: rgba(15,23,42,0.28);
    --overlay-bg2: rgba(15,23,42,0.38);
    --row-border: rgba(151,167,191,0.36);
    --row-border2: rgba(151,167,191,0.26);
    --badge-future-bg: #e9eef7;
    --badge-done-bg: rgba(39,176,124,0.16);
    --badge-next-bg: rgba(91,140,255,0.16);
    --alert-bg: rgba(228,111,127,0.10);
    --alert-border: rgba(228,111,127,0.26);
    --alert-ok-bg: rgba(39,176,124,0.10);
    --alert-ok-border: rgba(39,176,124,0.24);
    --filter-active-bg: rgba(91,140,255,0.14);
    --confirm-border: rgba(151,167,191,0.38);
    --shadow: 0 10px 28px rgba(67,84,110,0.14);
  }

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

  body {
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: radial-gradient(circle at top center, rgba(154,140,255,0.08), transparent 42%), var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
  }

  /* MAIN */
  main {
    flex: 1 0 auto;
    width: 100%;
    padding: 32px;
    max-width: 1200px;
    margin: 0 auto;
  }

  .app-footer {
    margin-top: auto;
    flex-shrink: 0;
  }

  section { display: none; }
  section.visible { display: block; }

  /* DASHBOARD */
  .section-title {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 8px;
  }

  .section-sub {
    font-size: 15px;
    color: var(--text-muted);
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    margin-bottom: 28px;
  }

  .field input[type="date"] {
    color-scheme: dark;
  }

  .field input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(0.72);
    cursor: pointer;
  }

  /* CHART SIMPLE */
  .chart-wrap {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 24px;
    margin-bottom: 28px;
  }

  .chart-title {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .chart-title::before {
    content: '';
    display: inline-block;
    width: 8px; height: 8px;
    border-radius: 2px;
    background: var(--accent);
  }

  .bar-chart {
    display: flex;
    align-items: flex-end;
    gap: 6px;
    height: 120px;
  }

  .bar-col {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    height: 100%;
    justify-content: flex-end;
  }

  .bar {
    width: 100%;
    background: var(--accent2);
    border-radius: 3px 3px 0 0;
    transition: height 0.6s ease;
    position: relative;
    cursor: pointer;
  }

  .bar:hover { filter: brightness(1.3); }

  .bar-label {
    font-size: 9px;
    color: var(--text-muted);
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    text-align: center;
    line-height: 1.2;
  }

  /* COURSES TABLE */
  .table-wrap {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    overflow: hidden;
    margin-bottom: 28px;
  }

  .table-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  table { width: 100%; border-collapse: collapse; }

  th {
    text-align: left;
    padding: 10px 16px;
    font-size: 10px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-muted);
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    border-bottom: 1px solid var(--border);
    font-weight: 400;
  }

  td {
    padding: 12px 16px;
    font-size: 13px;
    border-bottom: 1px solid var(--row-border);
  }

  tr:last-child td { border-bottom: none; }
  tr:hover td { background: var(--surface2); }

  .badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 10px;
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-weight: 700;
  }

  .badge-done { background: var(--badge-done-bg); color: var(--z1); }
  .badge-next { background: var(--badge-next-bg); color: var(--accent); }
  .badge-future { background: var(--badge-future-bg); color: var(--text-muted); }

  /* PLAN VIEW */
  .week-grid {
    display: grid;
    gap: 12px;
    margin-bottom: 28px;
  }

  .week-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
    overflow: hidden;
  }

  .week-header {
    background: var(--surface2);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
  }

  .week-num {
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 12px;
    color: var(--accent);
    letter-spacing: 2px;
  }

  .week-date {
    font-size: 14px;
    color: var(--text-muted);
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  }

  .session-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    border-bottom: 1px solid var(--row-border2);
    transition: background 0.15s;
    cursor: pointer;
  }

  .session-row:last-child { border-bottom: none; }
  .session-row:hover { background: var(--surface2); }

  .session-check {
    width: 18px; height: 18px;
    border-radius: 4px;
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.2s;
    font-size: 11px;
  }

  .session-check.done { background: var(--z1); border-color: var(--z1); color: #000; }

  .session-format {
    flex: 1;
    font-size: 13px;
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.4;
  }

  .zone-tag {
    display: inline-block;
    width: 20px; height: 16px;
    border-radius: 3px;
    font-size: 9px;
    text-align: center;
    line-height: 16px;
    font-weight: 700;
    margin-right: 1px;
  }

  .session-meta {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
    align-items: center;
  }

  .session-date-badge {
    font-size: 12px;
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-muted);
    background: var(--surface2);
    padding: 3px 8px;
    border-radius: 3px;
    white-space: nowrap;
  }

  .pe-badge {
    font-size: 12px;
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-muted);
    background: var(--surface2);
    padding: 3px 8px;
    border-radius: 3px;
  }

  .duration-badge {
    font-size: 13px;
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--accent2);
    font-weight: 600;
  }

  .optional-tag {
    font-size: 11px;
    color: var(--text-muted);
    font-style: italic;
  }

  /* LOG FORM */
  .form-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 28px;
    margin-bottom: 28px;
  }

  .form-card h3 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 20px;
  }

  .form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
  }

  .field label {
    display: block;
    font-size: 10px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-muted);
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    margin-bottom: 6px;
  }

  .field input, .field select, .field textarea {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 7px;
    color: var(--text);
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 13px;
    padding: 10px 12px;
    outline: none;
    transition: border-color 0.2s;
  }

  .field input:focus, .field select:focus { border-color: var(--accent2); }

  .btn {
    background: var(--accent);
    color: #11131a;
    border: none;
    padding: 11px 24px;
    border-radius: 16px;
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
  }

  .btn:hover { filter: brightness(1.1); transform: translateY(-1px); }

  .btn-ghost {
    background: none;
    border: 1px solid var(--border);
    color: var(--text);
  }

  .btn-ghost:hover { border-color: var(--text-muted); background: var(--surface2); transform: none; }

  /* Log table */
  .mono { font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif; }

  .allure-fast { color: var(--z1); }
  .allure-mid { color: var(--accent2); }
  .allure-slow { color: var(--text-muted); }

  /* Alerts */
  .alert {
    background: var(--alert-bg);
    border: 1px solid var(--alert-border);
    border-radius: 8px;
    padding: 14px 18px;
    margin-bottom: 16px;
    font-size: 13px;
  }

  .alert-title {
    font-weight: 700;
    color: var(--accent3);
    margin-bottom: 4px;
    font-size: 12px;
    letter-spacing: 1px;
    text-transform: uppercase;
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  }

  .alert-ok {
    background: var(--alert-ok-bg);
    border-color: var(--alert-ok-border);
  }

  .alert-ok .alert-title { color: var(--z1); }


  @media (max-width: 640px) {
    main { padding: 16px; }
  }

  /* Light mode specific overrides */
  [data-theme="light"] body {
    background: radial-gradient(circle at top center, rgba(91,140,255,0.10), transparent 40%), var(--bg);
    color: var(--text);
  }
  [data-theme="light"] .bar {
    background: var(--accent2);
  }
  [data-theme="light"] input,
  [data-theme="light"] select,
  [data-theme="light"] textarea {
    background: var(--bg);
    color: var(--text);
    border-color: var(--border);
  }
  [data-theme="light"] .field input[type="date"] {
    color-scheme: light;
  }
  [data-theme="light"] .field input[type="date"]::-webkit-calendar-picker-indicator {
    filter: none;
  }
  [data-theme="light"] input::placeholder {
    color: var(--text-muted);
  }
  [data-theme="light"] .btn:not(.btn-ghost) {
    color: #f6fbff;
  }
  [data-theme="light"] .btn-ghost {
    color: var(--text);
    border-color: var(--border);
    background: transparent;
  }
  [data-theme="light"] tr:hover td {
    background: var(--surface2);
  }