/* =========================================================================
   planer-von-exinia — waldgruen / petrol / teal glass theme
   No cyan. No build step — hand-authored CSS custom properties + classes.
   ========================================================================= */

:root {
  /* Petrol — primary, buttons, focus, borders */
  --color-petrol-50:  #f0fafa;
  --color-petrol-100: #d2f0eb;
  --color-petrol-200: #a6e0d6;
  --color-petrol-300: #76cdbe;
  --color-petrol-400: #4ab5a3;
  --color-petrol-500: #2d9387;
  --color-petrol-600: #1f7669;
  --color-petrol-700: #1a5e54;
  --color-petrol-800: #163e38;
  --color-petrol-900: #0a3a3a;
  --color-petrol-950: #04201d;

  /* Waldgruen — secondary, success, pills, exam-prep */
  --color-wald-50:  #eaf5e7;
  --color-wald-100: #d2ebcf;
  --color-wald-200: #cae8c8;
  --color-wald-300: #a4d5a0;
  --color-wald-400: #7eb77a;
  --color-wald-500: #5a9957;
  --color-wald-600: #3f7a3d;
  --color-wald-700: #2d5a2c;
  --color-wald-800: #1c3e1c;
  --color-wald-900: #0a1f0a;
  --color-wald-950: #040f04;

  /* Teal — glow, gradients, highlights (sits between petrol and wald) */
  --color-teal-50:  #e8f5f2;
  --color-teal-100: #bde0d6;
  --color-teal-200: #8bc7b9;
  --color-teal-300: #5cab9c;
  --color-teal-400: #358d80;
  --color-teal-500: #1a6e64;
  --color-teal-600: #0e5550;
  --color-teal-700: #0a4240;
  --color-teal-800: #082e2c;
  --color-teal-900: #0a2a2e;
  --color-teal-950: #031513;

  /* Glow shadows — petrol focus, wald accent (no cyan) */
  --shadow-glow-sm: 0 0 8px rgba(74, 181, 163, 0.35), 0 0 16px rgba(74, 181, 163, 0.15);
  --shadow-glow-md: 0 0 12px rgba(74, 181, 163, 0.5), 0 0 24px rgba(90, 153, 87, 0.30);
  --shadow-glow-lg: 0 0 24px rgba(74, 181, 163, 0.6), 0 0 48px rgba(90, 153, 87, 0.40);

  /* Glass surfaces */
  --glass-card:    rgba(14, 34, 30, 0.55);
  --glass-elev:    rgba(20, 44, 39, 0.50);
  --glass-input:   rgba(10, 26, 23, 0.55);
  --glass-pill:    rgba(74, 181, 163, 0.10);
  --glass-pill-em: rgba(90, 153, 87, 0.10);
  --glass-border:  rgba(168, 220, 207, 0.18);
  --glass-border-em: rgba(168, 220, 207, 0.28);

  /* Theme base */
  --bg-base: #06120f;
  --bg-elev: #0a1f1b;
  --text-base: #e6f3ee;
  --text-muted: #8fb3a8;
  --gradient-neon: linear-gradient(135deg, #4ab5a3 0%, #5a9957 100%);
  --gradient-bg:
    radial-gradient(ellipse at top, rgba(74, 181, 163, 0.10), transparent 60%),
    radial-gradient(ellipse at bottom right, rgba(90, 153, 87, 0.07), transparent 60%),
    #06120f;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--gradient-bg);
  background-attachment: fixed;
  color: var(--text-base);
  min-height: 100vh;
  line-height: 1.5;
}

/* ----- Layout primitives ----- */

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem;
  position: relative;
  z-index: 1;
}
.row { display: flex; gap: 1rem; align-items: center; }
.col { display: flex; flex-direction: column; gap: 0.75rem; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
@media (max-width: 720px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

/* ----- Glass cards ----- */

.card {
  background: var(--glass-card);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  padding: 1.25rem;
  box-shadow: 0 8px 32px rgba(10, 42, 38, 0.45),
              inset 0 1px 0 rgba(255, 255, 255, 0.04),
              var(--shadow-glow-sm);
  transition: box-shadow 200ms ease, transform 200ms ease, border-color 200ms ease;
}
.card:hover {
  box-shadow: 0 8px 32px rgba(10, 42, 38, 0.55),
              inset 0 1px 0 rgba(255, 255, 255, 0.06),
              var(--shadow-glow-md);
  border-color: rgba(168, 220, 207, 0.28);
}
.card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 0.75rem;
}
.card-title { font-size: 1.125rem; font-weight: 600; color: var(--color-petrol-200); }

/* ----- Typography ----- */

h1 {
  font-size: 2rem; font-weight: 700; margin: 0 0 1rem;
  background: var(--gradient-neon);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 32px rgba(74, 181, 163, 0.15);
}
h2 { font-size: 1.25rem; font-weight: 600; margin: 0; color: var(--color-petrol-200); }
.muted { color: var(--text-muted); font-size: 0.875rem; }

/* ----- Buttons (glass) ----- */

.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--color-petrol-700);
  background: var(--glass-elev);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: var(--color-petrol-200);
  font-weight: 500;
  cursor: pointer;
  transition: all 200ms ease;
  text-decoration: none;
}
.btn:hover {
  box-shadow: var(--shadow-glow-md);
  border-color: var(--color-petrol-400);
  color: var(--color-petrol-100);
  text-decoration: none;
}
.btn-primary {
  background: var(--gradient-neon);
  border: 1px solid transparent;
  color: #031513;
  font-weight: 600;
  box-shadow: var(--shadow-glow-sm);
}
.btn-primary:hover {
  box-shadow: var(--shadow-glow-lg);
  transform: translateY(-1px);
  color: #031513;
}
.btn-ghost {
  background: transparent;
  border-color: var(--color-wald-700);
  color: var(--color-wald-300);
}
.btn-ghost:hover {
  border-color: var(--color-wald-400);
  color: var(--color-wald-200);
  box-shadow: 0 0 12px rgba(90, 153, 87, 0.35);
}
.btn-icon {
  width: 2rem;
  height: 2rem;
  padding: 0;
  font-size: 1.1rem;
  line-height: 1;
  justify-content: center;
  color: var(--text-muted);
  border-color: var(--glass-border);
}
.btn-icon:hover {
  color: var(--color-wald-200);
  border-color: var(--color-wald-500);
  box-shadow: 0 0 8px rgba(90, 153, 87, 0.45);
}

/* ----- Forms (glass) ----- */

input, select, textarea {
  background: var(--glass-input);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: var(--text-base);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  padding: 0.5rem 0.75rem;
  font: inherit;
  width: 100%;
  transition: border-color 200ms ease, box-shadow 200ms ease, background 200ms ease;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--color-petrol-400);
  box-shadow: 0 0 0 3px rgba(74, 181, 163, 0.15), var(--shadow-glow-sm);
  background: rgba(10, 26, 23, 0.70);
}
input::placeholder, textarea::placeholder { color: var(--text-muted); opacity: 0.7; }
label { font-size: 0.875rem; color: var(--text-muted); display: block; margin-bottom: 0.25rem; }

/* ----- Date picker (deadline, semester start) -----
   Native <input type="date"> with a themed indicator. The picker opens on
   the whole field (not just the icon) via the showPicker() JS handler that
   the form wires up. */

input[type="date"].date-picker {
  cursor: pointer;
  min-height: 2.5rem;
  padding-right: 2.25rem;
  color-scheme: dark;
}
input[type="date"].date-picker::-webkit-calendar-picker-indicator {
  -webkit-appearance: none;
  appearance: none;
  width: 1.25rem;
  height: 1.25rem;
  margin: 0;
  padding: 0;
  cursor: pointer;
  opacity: 0.85;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23a4d5a0' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><rect x='3' y='4' width='18' height='18' rx='2' ry='2'/><line x1='16' y1='2' x2='16' y2='6'/><line x1='8' y1='2' x2='8' y2='6'/><line x1='3' y1='10' x2='21' y2='10'/></svg>");
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  filter: drop-shadow(0 0 4px rgba(90, 153, 87, 0.45));
  transition: opacity 200ms ease, transform 200ms ease;
}
input[type="date"].date-picker::-webkit-calendar-picker-indicator:hover {
  opacity: 1;
  transform: scale(1.1);
}
input[type="date"].date-picker::-moz-calendar-picker-indicator {
  width: 1.25rem;
  height: 1.25rem;
  cursor: pointer;
  filter: invert(0.85) sepia(0.5) saturate(2) hue-rotate(85deg);
}

/* ----- Progress bar ----- */

.progress {
  position: relative;
  height: 0.625rem;
  background: rgba(10, 26, 23, 0.55);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  border-radius: 999px;
  overflow: hidden;
  margin-top: 0.5rem;
  border: 1px solid var(--glass-border);
}
.progress-fill {
  height: 100%;
  background: var(--gradient-neon);
  border-radius: 999px;
  box-shadow: 0 0 8px rgba(74, 181, 163, 0.6);
  transition: width 400ms ease;
}
.progress-label { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.25rem; display: flex; justify-content: space-between; }

/* ----- Per-section slider (Waldgrün) ----- */

input[type="range"].week-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 0.5rem;
  background: var(--color-wald-800);
  border-radius: 999px;
  border: 1px solid var(--glass-border);
  outline: none;
  margin: 0.5rem 0;
  padding: 0;
  cursor: default;
}
input[type="range"].week-slider::-webkit-slider-runnable-track {
  height: 0.5rem;
  background: linear-gradient(
    to right,
    var(--color-wald-500) 0%,
    var(--color-wald-500) var(--val, 0%),
    var(--color-wald-800) var(--val, 0%),
    var(--color-wald-800) 100%
  );
  border-radius: 999px;
}
input[type="range"].week-slider::-moz-range-track {
  height: 0.5rem;
  background: var(--color-wald-800);
  border-radius: 999px;
}
input[type="range"].week-slider::-moz-range-progress {
  height: 0.5rem;
  background: var(--color-wald-500);
  border-radius: 999px;
}
input[type="range"].week-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: var(--color-wald-300);
  border: 2px solid var(--color-wald-500);
  box-shadow: 0 0 6px rgba(90, 153, 87, 0.6);
  margin-top: -0.25rem;
  cursor: default;
}
input[type="range"].week-slider::-moz-range-thumb {
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: var(--color-wald-300);
  border: 2px solid var(--color-wald-500);
  box-shadow: 0 0 6px rgba(90, 153, 87, 0.6);
  cursor: default;
}

/* ----- Pills / tags (glass) ----- */

.pill {
  display: inline-block;
  padding: 0.125rem 0.55rem;
  border-radius: 999px;
  font-size: 0.75rem;
  background: var(--glass-pill);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: var(--color-petrol-200);
  border: 1px solid var(--glass-border);
}
.pill-emerald {
  background: var(--glass-pill-em);
  color: var(--color-wald-200);
  border-color: var(--glass-border-em);
}

/* ----- Calendar grid ----- */

.cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.5rem;
  margin-top: 1rem;
}
.cal-cell {
  min-height: 80px;
  padding: 0.5rem;
  background: rgba(14, 34, 30, 0.40);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  display: flex; flex-direction: column; gap: 0.25rem;
  font-size: 0.875rem;
  transition: border-color 200ms ease, box-shadow 200ms ease;
}
.cal-cell.empty { background: transparent; border-color: transparent; backdrop-filter: none; -webkit-backdrop-filter: none; }
.cal-cell.today {
  border-color: var(--color-petrol-400);
  box-shadow: 0 0 0 1px rgba(74, 181, 163, 0.25), var(--shadow-glow-sm);
  background: rgba(20, 50, 44, 0.55);
}
.cal-cell .date-num { font-weight: 600; color: var(--color-petrol-300); }
.cal-cell .cal-task {
  font-size: 0.75rem;
  padding: 0.125rem 0.375rem;
  background: rgba(90, 153, 87, 0.12);
  border: 1px solid rgba(90, 153, 87, 0.28);
  border-radius: 6px;
  color: var(--color-wald-200);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}

/* ----- Task list ----- */

.task { display: flex; align-items: center; gap: 0.5rem; padding: 0.5rem; border-radius: 8px; }
.task:hover { background: rgba(74, 181, 163, 0.06); }
.task input[type=checkbox] {
  width: 1.1rem; height: 1.1rem;
  accent-color: var(--color-petrol-400);
  cursor: pointer;
}
.task.done .task-title { text-decoration: line-through; color: var(--text-muted); }
.task-title { flex: 1; }
.task-deadline { font-size: 0.75rem; color: var(--text-muted); }

/* ----- Misc ----- */

a { color: var(--color-petrol-300); text-decoration: none; }
a:hover { color: var(--color-petrol-200); text-decoration: underline; }
.spacer { flex: 1; }
hr { border: none; border-top: 1px solid var(--glass-border); margin: 1rem 0; }
.nav { display: flex; gap: 1rem; margin-bottom: 1.5rem; }

/* Fallback for browsers without backdrop-filter: keep a flat dark tint */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .card { background: var(--bg-elev); }
  .btn { background: var(--bg-elev); }
  input, select, textarea { background: var(--bg-elev); }
  .progress { background: var(--bg-elev); }
  .cal-cell { background: var(--bg-elev); }
}