/* Study Planner polish: empty state, spinner, focus outline, touch targets. */

/* Declare color-scheme for dark themes so native controls render correctly. */
html[data-theme="midnight"],
html[data-theme="nocturne"] {
  color-scheme: dark;
}

html[data-theme="breeze"],
html[data-theme="sunrise"],
html[data-theme="forest"],
html[data-theme="amber"] {
  color-scheme: light;
}

/* =====================================================================
   Stronger focus outline (replaces semi-transparent default).
   ===================================================================== */
:root {
  --focus-ring: 0 0 0 3px color-mix(in srgb, var(--accent) 35%, transparent);
}

*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  box-shadow: var(--focus-ring);
  border-radius: inherit;
}

button:focus-visible,
a:focus-visible,
[role="button"]:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* =====================================================================
   Empty state component. Render inside any container: .empty-state
   ===================================================================== */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 32px 20px;
  text-align: center;
  color: var(--ink-muted);
  min-height: 180px;
}

.empty-state__icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent-soft);
  display: grid;
  place-items: center;
  font-size: 22px;
  color: var(--accent);
}

.empty-state__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
  margin: 0;
}

.empty-state__body {
  font-size: 0.92rem;
  line-height: 1.5;
  max-width: 38ch;
  margin: 0;
}

.empty-state__action {
  margin-top: 4px;
}

/* =====================================================================
   Loading spinner. Used by <span class="spinner"> and .btn-spinner.
   ===================================================================== */
@keyframes study-spin {
  to { transform: rotate(360deg); }
}

.spinner,
.btn-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid color-mix(in srgb, var(--ink) 20%, transparent);
  border-top-color: var(--accent);
  animation: study-spin 0.8s linear infinite;
  vertical-align: middle;
}

.spinner--lg {
  width: 24px;
  height: 24px;
  border-width: 3px;
}

.btn-spinner {
  margin-right: 6px;
}

/* Respect reduced-motion preference (a11y.css also covers this globally). */
@media (prefers-reduced-motion: reduce) {
  .spinner,
  .btn-spinner {
    animation-duration: 2s;
  }
}

/* =====================================================================
   Visually hidden helper (for screen-reader-only labels).
   ===================================================================== */
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* =====================================================================
   Minimum touch targets for mobile — ensures 44x44px hit area.
   ===================================================================== */
@media (pointer: coarse) {
  button,
  [role="button"],
  .icon-btn,
  a.btn,
  input[type="button"],
  input[type="submit"] {
    min-height: 44px;
    min-width: 44px;
  }
}

/* =====================================================================
   VISIBLE DESIGN POLISH — layers on top of existing styles.
   These rules add refinement (elevation, motion, accents) without
   changing information architecture.
   ===================================================================== */

/* Smooth default transitions on interactive surfaces. */
.btn,
.chip-btn,
.focus-card,
.subject-column,
.today-item,
.focus-timer-box,
.focus-timer-mode-btn,
.confidence-toggle-btn,
.modal-close-btn,
.focus-break-btn,
.focus-main-btn {
  transition:
    transform 160ms cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 200ms cubic-bezier(0.22, 1, 0.36, 1),
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease;
}

/* Primary button: gradient accent + refined shadow + press feedback. */
body .btn:not(.btn-secondary):not(.subject-add-btn):not([disabled]) {
  background: linear-gradient(135deg, var(--accent) 0%, color-mix(in srgb, var(--accent) 82%, #ffffff 18%) 100%);
  border: 1px solid color-mix(in srgb, var(--accent) 85%, #000 0%);
  color: #fff;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.18) inset,
    0 6px 16px -4px color-mix(in srgb, var(--accent) 55%, transparent);
  font-weight: 650;
  letter-spacing: 0.01em;
}

body .btn:not(.btn-secondary):not(.subject-add-btn):not([disabled]):hover {
  transform: translateY(-1px);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.22) inset,
    0 10px 22px -6px color-mix(in srgb, var(--accent) 65%, transparent);
  filter: saturate(1.05);
}

body .btn:not(.btn-secondary):not(.subject-add-btn):not([disabled]):active {
  transform: translateY(0);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.12) inset,
    0 4px 10px -4px color-mix(in srgb, var(--accent) 50%, transparent);
}

/* Secondary button refinement. */
body .btn.btn-secondary {
  background: color-mix(in srgb, var(--surface-bg) 80%, var(--accent-soft) 20%);
  border: 1px solid var(--border-subtle);
  color: var(--ink);
}
body .btn.btn-secondary:hover {
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border-subtle));
  background: var(--accent-soft);
  transform: translateY(-1px);
}

/* Subject columns lift on hover, with gentle accent border. */
.subject-column {
  will-change: transform;
}
.subject-column:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md, 0 18px 44px rgba(15, 23, 42, 0.12));
}

/* Focus card gets a subtle gradient top accent + elevated shadow. */
.focus-card {
  position: relative;
  overflow: hidden;
}
.focus-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    transparent,
    color-mix(in srgb, var(--accent) 70%, transparent) 20%,
    color-mix(in srgb, var(--accent) 100%, transparent) 50%,
    color-mix(in srgb, var(--accent) 70%, transparent) 80%,
    transparent
  );
  pointer-events: none;
  opacity: 0.75;
}

/* Today items: sharper left-border accent via existing --todo-accent var. */
.today-item {
  position: relative;
  border-left: 3px solid var(--todo-accent, var(--accent));
  padding-left: calc(var(--today-item-pl, 12px) + 2px);
}
.today-item:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px -8px rgba(15, 23, 42, 0.18);
}

/* Header h1: tighter letter-spacing, subtle accent underline dot. */
.header-main h1 {
  letter-spacing: -0.015em;
  font-feature-settings: "ss01" on, "ss02" on;
}

/* Focus timer box: larger, subtle glow on active session. */
.focus-timer-box {
  position: relative;
}
.focus-timer-box.studying::after,
.focus-timer-box.active::after {
  content: "";
  position: absolute;
  inset: -6px;
  border-radius: inherit;
  pointer-events: none;
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 40%, transparent);
  animation: study-timer-glow 2.4s ease-in-out infinite;
}

@keyframes study-timer-glow {
  0%,
  100% {
    box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 30%, transparent);
  }
  50% {
    box-shadow: 0 0 0 6px color-mix(in srgb, var(--accent) 18%, transparent);
  }
}

/* Confidence toggle buttons: active state with soft pill accent. */
.confidence-toggle-btn.confidence-toggle-active {
  background: linear-gradient(135deg, var(--accent-soft), color-mix(in srgb, var(--accent-soft) 70%, var(--accent) 30%));
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border-subtle));
  color: var(--accent);
  font-weight: 650;
}

/* Modal close button: circular, refined hover. */
.modal-close-btn {
  border-radius: 999px;
}
.modal-close-btn:hover {
  background: color-mix(in srgb, var(--accent-soft) 70%, transparent);
  transform: rotate(90deg);
}

/* Subtle top-of-page accent band, only visible while scrolled to top. */
body:not(.legal-page) .app::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    transparent,
    color-mix(in srgb, var(--accent) 50%, transparent) 20%,
    var(--accent) 50%,
    color-mix(in srgb, var(--accent) 50%, transparent) 80%,
    transparent
  );
  z-index: 1000;
  pointer-events: none;
  opacity: 0.55;
}

/* Focus ring on primary actions (keyboard users) slightly more prominent. */
body .btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--accent) 28%, transparent);
}

/* Active study: left-border accent + subtle pulse on file row and today item. */
.file-row.studying,
.today-item.today-item-studying {
  position: relative;
  border-left: 3px solid var(--accent);
}
.file-row.studying::after,
.today-item.today-item-studying::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  box-shadow: inset 3px 0 0 0 color-mix(in srgb, var(--accent) 60%, transparent);
  animation: study-row-pulse 2.6s ease-in-out infinite;
}
@keyframes study-row-pulse {
  0%, 100% { opacity: 0.65; }
  50%      { opacity: 1; }
}

/* Timer display: lift font-size slightly for at-a-glance readability. */
.focus-timer-display {
  font-size: clamp(1.8rem, 26cqw, 2.8rem);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* < 3 min session warning badge. */
.focus-timer-warn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.72rem;
  font-weight: 600;
  color: #b45309;
  background: color-mix(in srgb, #f59e0b 18%, transparent);
  border: 1px solid color-mix(in srgb, #f59e0b 40%, transparent);
  border-radius: 999px;
  padding: 2px 8px;
  margin-top: 4px;
  animation: focus-warn-fade 400ms ease-out;
}
@keyframes focus-warn-fade {
  from { opacity: 0; transform: translateY(-2px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Subject meter: color-banded base fallback when not overridden. */
.subject-meter-fill[data-band="low"]  { background: var(--meter-low); }
.subject-meter-fill[data-band="mid"]  { background: var(--meter-mid); }
.subject-meter-fill[data-band="high"] { background: var(--meter-high); }

/* Calendar event type badge (icon prefix). */
.ws-month-event[data-type]::before,
.ws-all-day-event[data-type]::before {
  margin-right: 4px;
  font-size: 0.85em;
}
.ws-month-event[data-type="deadline"]::before,
.ws-all-day-event[data-type="deadline"]::before { content: "\26A0\FE0F"; }
.ws-month-event[data-type="exam"]::before,
.ws-all-day-event[data-type="exam"]::before     { content: "\1F4DD"; }
.ws-month-event[data-type="study"]::before,
.ws-all-day-event[data-type="study"]::before    { content: "\1F4DA"; }
.ws-month-event[data-type="reminder"]::before,
.ws-all-day-event[data-type="reminder"]::before { content: "\23F0"; }

/* All-day event chip: dashed bottom border marks "no specific time". */
.ws-all-day-event {
  border-bottom: 2px dashed color-mix(in srgb, var(--accent) 50%, transparent);
}

/* Assignment status filter chips (visual pills). */
.assignments-filter-bar {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 8px 0;
}
.assignments-filter-chip {
  border: 1px solid var(--border-subtle);
  background: var(--surface-bg);
  color: var(--ink-muted);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 140ms ease, color 140ms ease, border-color 140ms ease;
}
.assignments-filter-chip:hover {
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border-subtle));
}
.assignments-filter-chip[aria-pressed="true"] {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 50%, var(--border-subtle));
}

/* Password strength meter. */
.pw-strength {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  margin-top: 6px;
}
.pw-strength__bar {
  height: 4px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--ink) 10%, transparent);
  transition: background-color 160ms ease;
}
.pw-strength[data-score="1"] .pw-strength__bar:nth-child(-n+1),
.pw-strength[data-score="2"] .pw-strength__bar:nth-child(-n+2),
.pw-strength[data-score="3"] .pw-strength__bar:nth-child(-n+3),
.pw-strength[data-score="4"] .pw-strength__bar:nth-child(-n+4) {
  background: var(--pw-color, var(--accent));
}
.pw-strength[data-score="1"] { --pw-color: #ef4444; }
.pw-strength[data-score="2"] { --pw-color: #f59e0b; }
.pw-strength[data-score="3"] { --pw-color: #3b82f6; }
.pw-strength[data-score="4"] { --pw-color: #10b981; }
.pw-strength__label {
  grid-column: 1 / -1;
  font-size: 0.72rem;
  color: var(--ink-muted);
  margin-top: 2px;
}

/* =====================================================================
   Calendar: current-time indicator line (red across today's column).
   ===================================================================== */
.ws-day-col { position: relative; }
.ws-now-line {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: #ef4444;
  z-index: 30;
  pointer-events: none;
  box-shadow: 0 0 8px rgba(239, 68, 68, 0.45);
}
.ws-now-line__dot {
  position: absolute;
  left: -5px;
  top: -4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #ef4444;
  box-shadow: 0 0 0 2px #fff, 0 0 12px rgba(239, 68, 68, 0.55);
}
html[data-theme="midnight"] .ws-now-line__dot,
html[data-theme="nocturne"] .ws-now-line__dot {
  box-shadow: 0 0 0 2px #0f172a, 0 0 12px rgba(239, 68, 68, 0.7);
}

/* Clickable month label (hover affordance). */
.ws-month-label--clickable {
  cursor: pointer;
  border-radius: 8px;
  padding: 2px 8px;
  transition: background-color 140ms ease, color 140ms ease;
}
.ws-month-label--clickable:hover {
  background: var(--accent-soft);
  color: var(--accent);
}
.ws-month-label--clickable:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.ws-month-label--clickable::after {
  content: " \25BE";
  font-size: 0.8em;
  opacity: 0.55;
}

/* Plan popover divider. */
.ws-plan-divider {
  height: 1px;
  background: var(--border-subtle);
  margin: 4px 0;
}

/* =====================================================================
   Stundenplan: conflict marker + phone swipe hint.
   ===================================================================== */
.tt-conflict {
  position: relative;
  box-shadow: 0 0 0 2px #ef4444, 0 4px 14px rgba(239, 68, 68, 0.25) !important;
  z-index: 3;
}
.tt-conflict::after {
  content: "\26A0\FE0F conflict";
  position: absolute;
  top: 4px;
  right: 4px;
  font-size: 0.66rem;
  font-weight: 700;
  color: #b91c1c;
  background: rgba(254, 226, 226, 0.95);
  border-radius: 6px;
  padding: 1px 6px;
  letter-spacing: 0.02em;
}
html[data-theme="midnight"] .tt-conflict::after,
html[data-theme="nocturne"] .tt-conflict::after {
  background: rgba(127, 29, 29, 0.85);
  color: #fecaca;
}

/* Phone timetable: swipe affordance (hint on first visit only if desired). */
@media (max-width: 720px) {
  .tt-day-nav.phone-only {
    gap: 10px;
    padding: 6px 4px;
  }
  .tt-day-nav-btn {
    min-width: 44px;
    min-height: 44px;
  }
}

/* Print stylesheet: hide chrome, expand calendar. */
@media print {
  body { background: #fff !important; color: #000 !important; padding: 0 !important; }
  .header-row,
  .ws-sidebar,
  .ws-sidebar-toggle,
  .ws-plan,
  .ws-view-toggle,
  .ws-today-btn,
  .ws-nav-arrows,
  .ws-add-task-btn,
  .site-footer,
  .phone-bottom-nav,
  .header-menu,
  .ws-scroll-btn,
  .app::before {
    display: none !important;
  }
  .weekly-shell {
    box-shadow: none !important;
    background: #fff !important;
  }
  .ws-grid,
  .ws-month-grid {
    background: #fff !important;
    box-shadow: none !important;
  }
  .ws-event,
  .ws-month-event,
  .ws-all-day-event {
    box-shadow: none !important;
    print-color-adjust: exact;
    -webkit-print-color-adjust: exact;
  }
  .ws-now-line { display: none !important; }
  /* Stundenplan print polish */
  .tt-day-nav,
  .timetable-board-actions,
  .timetable-tabs,
  .tt-sidebar,
  #tabMenu,
  .tt-day-nav.phone-only {
    display: none !important;
  }
  .timetable-board {
    padding: 0 !important;
    box-shadow: none !important;
  }
  .timetable-slot-lesson {
    box-shadow: none !important;
    print-color-adjust: exact;
    -webkit-print-color-adjust: exact;
  }
  @page { margin: 10mm; }
}

/* Scale respects reduced-motion. */
@media (prefers-reduced-motion: reduce) {
  .btn,
  .chip-btn,
  .focus-card,
  .subject-column,
  .today-item,
  .focus-timer-box,
  .focus-timer-mode-btn,
  .confidence-toggle-btn,
  .modal-close-btn,
  .focus-break-btn,
  .focus-main-btn {
    transition: none;
  }
  .focus-timer-box.studying::after,
  .focus-timer-box.active::after,
  .file-row.studying::after,
  .today-item.today-item-studying::after {
    animation: none;
  }
}