/* ---------------------------------------------------------
   Design tokens
   Concept: a student's grid-paper planner. The background
   carries a faint graph-paper grid; homework items read as
   colored tabs clipped onto the day they're due.
--------------------------------------------------------- */
:root {
  --paper: #eff2f6;
  --grid-line: #dbe2ec;
  --surface: #ffffff;
  --ink: #22283b;
  --ink-muted: #626b85;
  --accent: #f2761d;
  --accent-hover: #d9600a;
  --accent-soft: #ffe8d3;
  --danger: #d1373f;
  --danger-hover: #b42d34;
  --danger-soft: #fff0f1;
  --overlay: rgba(34, 40, 59, 0.45);
  --accent-shadow: rgba(242, 118, 29, 0.4);
  --radius: 10px;

  --subject-1: #f2545b;
  /* coral */
  --subject-2: #f5a623;
  /* amber */
  --subject-3: #2cb1bc;
  /* teal */
  --subject-4: #8b5cf6;
  /* violet */
  --subject-5: #3651e0;
  /* indigo */
  --subject-6: #2f9e44;
  /* green */

  --font-display: "Baloo 2", sans-serif;
  --font-body: "Inter", sans-serif;
  --font-mono: "JetBrains Mono", monospace;

  color-scheme: light;
}

/* Dark theme overrides. The `data-theme` attribute is set on <html>
   by a small inline script in <head> (before first paint, using the
   saved preference or the OS setting) and kept in sync afterwards by
   initThemeToggle() in app.js. */
[data-theme="dark"] {
  --paper: #171a24;
  --grid-line: #262b3a;
  --surface: #1f2330;
  --ink: #e9ebf3;
  --ink-muted: #9aa2bf;
  --accent: #ff9142;
  --accent-hover: #ffab68;
  --accent-soft: #402711;
  --danger: #ff7a7a;
  --danger-hover: #ff9494;
  --danger-soft: #3a1e20;
  --overlay: rgba(0, 0, 0, 0.6);
  --accent-shadow: rgba(255, 145, 66, 0.35);

  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 28px 28px;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color 0.15s ease, color 0.15s ease;
}

h1,
h2,
h3,
.brand {
  font-family: var(--font-display);
}

a {
  color: var(--accent);
}

button {
  font-family: var(--font-body);
  cursor: pointer;
}

/* ---------------- Top nav ---------------- */
.topnav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: var(--surface);
  border-bottom: 2px solid var(--ink);
}

.topnav .brand {
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.topnav .brand .dot {
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
  display: inline-block;
}

.topnav nav {
  display: flex;
  gap: 6px;
}

.topnav nav a,
.topnav nav button {
  font-size: 0.9rem;
  padding: 6px 12px;
  border-radius: var(--radius);
  border: none;
  background: transparent;
  color: var(--ink-muted);
  text-decoration: none;
  white-space: nowrap;
}

.topnav nav a.active,
.topnav nav a:hover,
.topnav nav button:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

/* ---------------- Theme toggle ---------------- */
.theme-toggle {
  border: 1.5px solid var(--ink);
  background: var(--surface);
  color: var(--ink);
  width: 34px;
  height: 34px;
  padding: 0;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  line-height: 1;
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
}

/* Beats ".topnav nav button" on specificity so the icon-button look
   wins over the default text-link nav styling. */
.topnav .theme-toggle {
  border: 1.5px solid var(--ink);
  background: var(--surface);
  color: var(--ink);
  margin-left: 4px;
}

/* Used on pages without a topnav (login.html). */
.theme-toggle-fixed {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 10;
}

/* ---------------- Auth pages ---------------- */
.auth-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.auth-card {
  width: 100%;
  max-width: 380px;
  background: var(--surface);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  padding: 32px 28px;
}

.auth-card h1 {
  font-size: 1.4rem;
  margin: 0 0 4px;
}

.auth-card p.tagline {
  color: var(--ink-muted);
  margin: 0 0 24px;
  font-size: 0.92rem;
}

label {
  display: block;
  font-size: 0.82rem;
  color: var(--ink-muted);
  margin-bottom: 6px;
}

input[type="email"],
input[type="text"],
input[type="date"],
input[type="time"],
input[type="number"],
textarea,
select {
  width: 100%;
  padding: 10px 12px;
  border: 1.5px solid var(--grid-line);
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  background: var(--paper);
  color: var(--ink);
  margin-bottom: 16px;
}

input[type="email"],
input[type="text"],
input[type="date"],
input[type="time"],
input[type="number"],
textarea {
  -webkit-appearance: none;
  appearance: none;
}

input:focus,
textarea:focus,
select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.btn-primary {
  width: 100%;
  padding: 11px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

#status,
#account-status {
  margin-top: 14px;
  font-size: 0.85rem;
  color: var(--ink-muted);
  min-height: 1.2em;
}

/* ---------------- Calendar page ---------------- */
main.app {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px;
}

.calendar-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.calendar-toolbar .nav-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  border: 1.5px solid var(--ink);
  background: var(--surface);
  border-radius: 8px;
  width: 34px;
  height: 34px;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.range-label {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  min-width: 160px;
  text-align: center;
}

.view-toggle {
  display: flex;
  border: 1.5px solid var(--ink);
  border-radius: 8px;
  overflow: hidden;
}

.view-toggle button {
  border: none;
  background: var(--surface);
  padding: 7px 14px;
  font-size: 0.85rem;
  color: var(--ink-muted);
  border-left: 1.5px solid var(--ink);
}

.view-toggle button:first-child {
  border-left: none;
}

.view-toggle button.active {
  background: var(--ink);
  color: var(--paper);
}

/* Month grid */
.month-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 6px;
  width: 100%;
  box-sizing: border-box;
  overflow-x: hidden;
}

.weekday-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-muted);
  text-align: center;
  padding-bottom: 4px;
}

.day-cell {
  background: var(--surface);
  border: 1.5px solid var(--grid-line);
  border-radius: 8px;
  min-height: 92px;
  min-width: 0;
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}

.day-cell.today {
  border-color: var(--accent);
  border-width: 2px;
}

.day-cell.outside {
  opacity: 0.4;
}

.day-number {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-muted);
}

.hw-tab {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.72rem;
  padding: 2px 6px;
  border-radius: 4px;
  color: white;
  border: none;
  text-align: left;
  width: 100%;
  min-width: 0;
}

.hw-tab input[type="checkbox"] {
  flex-shrink: 0;
  width: 12px;
  height: 12px;
  margin: 0;
  accent-color: white;
}

.hw-tab-label {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  cursor: pointer;
}

.hw-tab.done .hw-tab-label {
  text-decoration: line-through;
  opacity: 0.7;
}

.hw-tab.test::after {
  content: " 📝";
}

.hw-tab.study::after {
  content: " 📚";
}

.hw-tab.do::after {
  content: " ✏️";
}

/* Week / day views: simple vertical agenda */
.agenda-day {
  background: var(--surface);
  border: 1.5px solid var(--grid-line);
  border-radius: 8px;
  padding: 10px;
  margin-bottom: 10px;
}

.agenda-day h3 {
  margin: 0 0 8px;
  font-size: 0.95rem;
}

.agenda-day.today h3 {
  color: var(--accent);
}

.agenda-empty {
  color: var(--ink-muted);
  font-size: 0.85rem;
  font-style: italic;
}

.agenda-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 0;
  border-top: 1px solid var(--grid-line);
}

.agenda-item:first-of-type {
  border-top: none;
}

.agenda-item input[type="checkbox"] {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

.checkbox-spacer {
  display: inline-block;
  width: 16px;
  flex-shrink: 0;
}

.agenda-item.done .agenda-item-label {
  text-decoration: line-through;
  opacity: 0.55;
}

.agenda-item-label {
  cursor: pointer;
}

.subject-chip {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.agenda-item .time {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-muted);
  width: 52px;
  flex-shrink: 0;
}

/* Floating add button */
.fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  border: none;
  font-size: 1.6rem;
  box-shadow: 0 4px 14px var(--accent-shadow);
}

.fab:hover {
  background: var(--accent-hover);
}

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-backdrop.hidden {
  display: none;
}

.hidden {
  display: none !important;
}

.modal {
  background: var(--surface);
  border-radius: var(--radius);
  border: 2px solid var(--ink);
  width: 100%;
  max-width: 420px;
  padding: 24px;
  max-height: 90vh;
  overflow-y: auto;
}

.modal h2 {
  margin-top: 0;
  font-size: 1.15rem;
}

.type-toggle {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.type-toggle label {
  flex: 1;
  border: 1.5px solid var(--grid-line);
  border-radius: 8px;
  text-align: center;
  padding: 8px;
  margin: 0;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--ink-muted);
}

.type-toggle input {
  display: none;
}

.type-toggle input:checked+span {
  color: var(--accent);
  font-weight: 700;
}

.type-toggle label:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 4px;
}

.btn-secondary {
  flex: 1;
  padding: 10px;
  background: var(--paper);
  border: 1.5px solid var(--grid-line);
  border-radius: 8px;
  font-size: 0.9rem;
}

.modal-actions .btn-primary {
  flex: 2;
  width: auto;
}

.modal-actions-vertical {
  flex-direction: column;
}

.recovery-banner {
  background: var(--danger-soft);
  border: 1.5px solid var(--danger);
}

.recovery-banner h3 {
  color: var(--danger);
}

.btn-danger {
  padding: 10px;
  background: var(--danger);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer;
}

.btn-danger:hover {
  background: var(--danger-hover);
}

.btn-danger-outline {
  background: transparent;
  color: var(--danger);
  border: 1.5px solid var(--danger);
}

.btn-danger-outline:hover {
  background: var(--danger);
  color: white;
}

.modal-actions .btn-danger {
  flex: none;
  width: auto;
}

/* ---------------- Test planner form (plan.html) ---------------- */
.planner-card {
  background: var(--surface);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  padding: 28px;
  max-width: 640px;
  margin: 20px auto;
}

.planner-card h1 {
  font-size: 1.3rem;
  margin: 0 0 4px;
}

.planner-card p.tagline {
  color: var(--ink-muted);
  margin: 0 0 24px;
  font-size: 0.9rem;
}

.planner-warning {
  margin: 0 0 20px;
  padding: 10px 12px;
  border: 1.5px solid var(--danger);
  border-radius: 8px;
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 0.9rem;
}

.estimate-preview {
  margin: 0 0 20px;
  padding: 12px 16px;
  border: 1.5px solid var(--accent);
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--ink);
  font-size: 0.9rem;
}

.estimate-preview.hidden {
  display: none !important;
}

/* ---------------- Upcoming tests overview (plan.html) ---------------- */
.tests-overview {
  background: var(--surface);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  padding: 24px 28px;
  max-width: 640px;
  margin: 20px auto 0;
}

.tests-overview h2 {
  font-size: 1.05rem;
  margin: 0 0 4px;
}

.tests-overview .tagline {
  color: var(--ink-muted);
  margin: 0 0 18px;
  font-size: 0.85rem;
}

.tests-overview-empty {
  color: var(--ink-muted);
  font-size: 0.9rem;
  margin: 0;
}

.test-overview-row {
  display: block;
  border: 1.5px solid var(--grid-line);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 10px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease;
}

.test-overview-row:last-child {
  margin-bottom: 0;
}

.test-overview-row:hover {
  border-color: var(--accent);
}

.test-overview-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

.test-overview-name {
  font-weight: 600;
  font-family: var(--font-display);
}

.test-overview-date {
  font-size: 0.82rem;
  color: var(--ink-muted);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.test-overview-stats {
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-size: 0.85rem;
  color: var(--ink-muted);
}

.test-overview-overdue {
  display: inline-block;
  margin-top: 8px;
  padding: 2px 10px;
  border-radius: 20px;
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 0.78rem;
  font-weight: 600;
}

.timing-history {
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1.5px solid var(--grid-line);
}

.timing-history h2 {
  font-size: 1.05rem;
  margin: 0 0 6px;
}

.timing-history .tagline {
  color: var(--ink-muted);
  font-size: 0.82rem;
  margin: 0 0 14px;
}

.time-sample-row {
  padding: 12px 0;
  border-top: 1px solid var(--grid-line);
}

.time-sample-summary {
  margin: 0 0 8px;
  font-size: 0.82rem;
  color: var(--ink-muted);
}

.time-sample-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 8px;
  align-items: end;
}

.time-sample-controls label {
  margin: 0;
  font-size: 0.78rem;
}

.time-sample-controls input {
  margin-top: 4px;
}

.time-sample-controls button {
  width: auto;
  padding: 9px 10px;
  font-size: 0.8rem;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

fieldset {
  border: none;
  padding: 0;
  margin: 0 0 20px;
}

fieldset>legend {
  font-size: 0.82rem;
  color: var(--ink-muted);
  margin-bottom: 8px;
  padding: 0;
}

.weekday-picker {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.weekday-picker label {
  margin: 0;
  cursor: pointer;
}

.weekday-picker input {
  display: none;
}

.weekday-picker span {
  display: inline-block;
  padding: 7px 11px;
  border-radius: 8px;
  border: 1.5px solid var(--grid-line);
  font-size: 0.82rem;
  color: var(--ink-muted);
}

.weekday-picker input:checked+span {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.days-off-row {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.days-off-row input {
  margin-bottom: 0;
  flex: 1;
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 6px;
}

.chip {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--paper);
  border: 1.5px solid var(--grid-line);
  border-radius: 20px;
  padding: 4px 6px 4px 12px;
  font-size: 0.82rem;
  font-family: var(--font-mono);
}

.chip button {
  border: none;
  background: none;
  color: var(--ink-muted);
  font-size: 1rem;
  line-height: 1;
  padding: 2px 6px;
}

.chip button:hover {
  color: var(--danger);
}

.material-row {
  border: 1.5px solid var(--grid-line);
  border-radius: 8px;
  padding: 14px;
  margin-bottom: 12px;
  position: relative;
}

.material-row .remove-material {
  position: absolute;
  top: 10px;
  right: 10px;
  border: none;
  background: none;
  color: var(--ink-muted);
  font-size: 1.1rem;
}

.material-row .remove-material:hover {
  color: var(--danger);
}

.material-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 12px;
}

.material-grid .field-row-3 {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
}

.m-kind-hint {
  margin: 6px 0 0;
  font-size: 0.78rem;
  color: var(--ink-muted);
}

.add-material-btn {
  width: 100%;
  padding: 10px;
  background: var(--paper);
  border: 1.5px dashed var(--grid-line);
  border-radius: 8px;
  color: var(--ink-muted);
  font-size: 0.88rem;
  margin-bottom: 20px;
}

.add-material-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

@media (max-width: 560px) {
  .topnav {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 16px;
  }

  .topnav nav {
    width: 100%;
    justify-content: space-between;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .topnav nav::-webkit-scrollbar {
    display: none;
  }

  .topnav nav {
    -ms-overflow-style: none;
    scrollbar-width: none;
  }

  .topnav nav a,
  .topnav nav button {
    padding: 6px 8px;
  }

  .calendar-toolbar {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .calendar-toolbar .nav-group {
    justify-content: space-between;
  }

  .calendar-toolbar .view-toggle {
    display: flex;
  }

  .calendar-toolbar .view-toggle button {
    flex: 1;
  }

  .month-grid {
    gap: 3px;
  }

  .day-cell {
    min-height: 64px;
    padding: 4px;
  }

  .weekday-label {
    font-size: 0.62rem;
  }

  .field-row,
  .material-grid,
  .material-grid .field-row-3 {
    grid-template-columns: 1fr;
  }

  .time-sample-controls {
    grid-template-columns: 1fr 1fr;
  }

  .time-sample-controls label {
    grid-column: 1 / -1;
  }
}