/* ── Design Sprint Tools — Shared CSS Design System ─────────── */
/* Mobile-first: 375px base → 768px tablet → 1024px desktop    */

/* ── Custom Properties ────────────────────────────────────── */

:root {
  /* Colors */
  --bg: #f5f5f7;
  --surface: #ffffff;
  --surface-raised: #ffffff;
  --text: #1c1c1e;
  --text-dim: #8e8e93;
  --accent: #0071e3;
  --accent-hover: #0058b0;
  --border: #d1d1d6;
  --shadow-color: #000000;

  /* Sticky note palette */
  --sticky-yellow: #fff176;
  --sticky-yellow-border: #f9a825;
  --sticky-pink: #f8bbd0;
  --sticky-pink-border: #e91e63;
  --sticky-blue: #b3e5fc;
  --sticky-blue-border: #039be5;
  --sticky-green: #c8e6c9;
  --sticky-green-border: #43a047;
  --sticky-orange: #ffe0b2;
  --sticky-orange-border: #fb8c00;
  --sticky-purple: #e1bee7;
  --sticky-purple-border: #8e24aa;

  /* Status / feedback */
  --success: #34c759;
  --success-bg: #d1fae5;
  --success-text: #065f46;
  --error: #ff3b30;
  --error-bg: #fee2e2;
  --error-text: #991b1b;
  --warning: #ff9f0a;
  --warning-bg: #fef3c7;
  --warning-text: #92400e;
  --info-bg: #dbeafe;
  --info-text: #1e40af;
  --color-planning: #1e40af;
  --color-planning-bg: #dbeafe;
  --color-completed: #92400e;
  --color-completed-bg: #fef3c7;
  --purple-text: #6a1b9a;
  --orange-dark-text: #7b3f00;

  /* Timer */
  --timer-normal: #34c759;
  --timer-warning: #ff9f0a;
  --timer-critical: #ff3b30;
  --timer-paused: #8e8e93;

  /* Spacing scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Typography */
  --font: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  --text-xs: 0.6875rem;
  --text-sm: 0.8125rem;
  --text-base: 0.9375rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;
  --text-2xl: 1.75rem;
  --text-3xl: 2.5rem;

  /* Shape */
  --radius-sm: 0.25rem;
  --radius: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 99rem;
}

/* ── Reset ────────────────────────────────────────────────── */

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

/* ── Base ─────────────────────────────────────────────────── */

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  font-size: var(--text-base);
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ── Container ────────────────────────────────────────────── */

.container {
  width: 100%;
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.container-sm {
  max-width: 48rem;
}

.container-md {
  max-width: 64rem;
}

/* ── Responsive Grid ──────────────────────────────────────── */
/* Mobile-first: single column → 2 col @ 768px → 3/4 col @ 1024px */

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

@media (min-width: 48rem) {        /* 768px */
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 64rem) {        /* 1024px */
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* ── Page Header ──────────────────────────────────────────── */

.page-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: var(--space-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.page-header .container {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.page-header h1 {
  font-size: var(--text-lg);
  font-weight: 700;
  flex: 1;
}

.back-link {
  color: var(--text-dim);
  font-size: var(--text-sm);
  font-weight: 500;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 0.3em;
}

.back-link:hover {
  color: var(--accent);
  text-decoration: none;
}

.page-actions {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
  flex-wrap: wrap;
}

/* ── Cards ────────────────────────────────────────────────── */

.card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: 0 2px 8px color-mix(in srgb, var(--shadow-color) 6%, transparent);
  overflow: hidden;
  transition: box-shadow 0.2s, transform 0.2s;
}

.card:hover {
  box-shadow: 0 4px 16px color-mix(in srgb, var(--shadow-color) 10%, transparent);
}

.card-clickable {
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
}

.card-clickable:hover {
  transform: translateY(-2px);
  text-decoration: none;
}

.card-body {
  padding: var(--space-lg);
}

.card-header {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.card-footer {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--border);
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-sm);
}

.card-title {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.card-subtitle {
  font-size: var(--text-sm);
  color: var(--text-dim);
}

.card-icon {
  font-size: 2rem;
  line-height: 1;
  margin-bottom: var(--space-sm);
}

/* Tool cards on landing page */
.tool-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  transition: box-shadow 0.2s, transform 0.2s, border-color 0.2s;
}

.tool-card:hover {
  box-shadow: 0 6px 20px color-mix(in srgb, var(--shadow-color) 12%, transparent);
  border-color: var(--accent);
  transform: translateY(-2px);
  text-decoration: none;
}

.tool-card .tool-icon {
  font-size: 2rem;
  line-height: 1;
}

.tool-card .tool-name {
  font-size: var(--text-base);
  font-weight: 700;
}

.tool-card .tool-desc {
  font-size: var(--text-sm);
  color: var(--text-dim);
  flex: 1;
}

.tool-card .tool-duration {
  font-size: var(--text-xs);
  color: var(--accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ── Quadrant Layout ──────────────────────────────────────── */
/* Used for: SWOT, Empathy Map, Prioritization Matrix, etc.   */

.quadrant-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 24rem;
}

.quadrant {
  background: var(--surface);
  display: flex;
  flex-direction: column;
  min-height: 12rem;
}

.quadrant-label {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.quadrant-label .quadrant-icon {
  font-size: 1rem;
}

.quadrant-content {
  flex: 1;
  padding: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  overflow-y: auto;
}

/* Quadrant color variants */
.quadrant-s .quadrant-label { color: var(--success-text); background: var(--success-bg); }
.quadrant-w .quadrant-label { color: var(--error-text); background: var(--error-bg); }
.quadrant-o .quadrant-label { color: var(--info-text); background: var(--info-bg); }
.quadrant-t .quadrant-label { color: var(--warning-text); background: var(--warning-bg); }

/* Axis labels (for prioritization matrix etc.) */
.quadrant-axis-x {
  display: flex;
  justify-content: space-between;
  padding: var(--space-xs) var(--space-md);
  font-size: var(--text-xs);
  color: var(--text-dim);
  font-weight: 600;
}

.quadrant-axis-y {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: var(--space-md) var(--space-xs);
  font-size: var(--text-xs);
  color: var(--text-dim);
  font-weight: 600;
  writing-mode: vertical-rl;
}

/* ── Sticky Notes ─────────────────────────────────────────── */

.sticky-note {
  background: var(--sticky-yellow);
  border: 1px solid var(--sticky-yellow-border);
  border-radius: var(--radius);
  padding: var(--space-sm);
  font-size: var(--text-sm);
  line-height: 1.4;
  box-shadow: 2px 2px 6px color-mix(in srgb, var(--shadow-color) 15%, transparent);
  position: relative;
  word-break: break-word;
  min-height: 5rem;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.sticky-note textarea {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  resize: none;
  font-family: var(--font);
  font-size: var(--text-sm);
  color: var(--text);
  width: 100%;
  min-height: 3.5rem;
}

.sticky-note .sticky-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-xs);
  opacity: 0;
  transition: opacity 0.15s;
}

.sticky-note:hover .sticky-actions,
.sticky-note:focus-within .sticky-actions {
  opacity: 1;
}

.sticky-delete {
  background: none;
  border: none;
  cursor: pointer;
  color: color-mix(in srgb, var(--error) 70%, transparent);
  font-size: var(--text-sm);
  padding: 0.1rem 0.3rem;
  border-radius: var(--radius-sm);
  line-height: 1;
}

.sticky-delete:hover {
  color: var(--error);
  background: color-mix(in srgb, var(--error) 10%, transparent);
}

/* Color variants */
.sticky-pink   { background: var(--sticky-pink);   border-color: var(--sticky-pink-border); }
.sticky-blue   { background: var(--sticky-blue);   border-color: var(--sticky-blue-border); }
.sticky-green  { background: var(--sticky-green);  border-color: var(--sticky-green-border); }
.sticky-orange { background: var(--sticky-orange); border-color: var(--sticky-orange-border); }
.sticky-purple { background: var(--sticky-purple); border-color: var(--sticky-purple-border); }

/* Sticky note grid container */
.sticky-board {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(11rem, 1fr));
  gap: var(--space-sm);
  padding: var(--space-sm);
  min-height: 8rem;
}

.sticky-add-btn {
  background: color-mix(in srgb, var(--sticky-yellow) 60%, transparent);
  border: 2px dashed var(--sticky-yellow-border);
  border-radius: var(--radius);
  padding: var(--space-sm);
  font-size: var(--text-xl);
  color: var(--text-dim);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 5rem;
  transition: background 0.15s, color 0.15s;
}

.sticky-add-btn:hover {
  background: color-mix(in srgb, var(--sticky-yellow) 80%, transparent);
  color: var(--text);
}

/* ── Form Inputs ──────────────────────────────────────────── */

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.form-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
}

.form-label .required {
  color: var(--error);
  margin-left: 0.2em;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--space-sm) 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: var(--text-base);
  font-family: var(--font);
  background: var(--surface);
  color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-textarea {
  resize: vertical;
  min-height: 6rem;
  line-height: 1.5;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 15%, transparent);
}

.form-input.error,
.form-textarea.error {
  border-color: var(--error);
}

.form-hint {
  font-size: var(--text-xs);
  color: var(--text-dim);
}

.form-error {
  font-size: var(--text-xs);
  color: var(--error);
  display: none;
}

.form-error.visible {
  display: block;
}

.form-select {
  appearance: none;
  padding-right: 2rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238e8e93' d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  cursor: pointer;
}

/* ── Buttons ──────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  border: none;
  border-radius: var(--radius);
  font-size: var(--text-sm);
  font-family: var(--font);
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
  transition: background 0.15s, box-shadow 0.15s, transform 0.1s;
  user-select: none;
}

.btn:active {
  transform: scale(0.97);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-ghost {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--bg);
  border-color: color-mix(in srgb, var(--border) 80%, var(--text));
}

.btn-danger {
  background: var(--error);
  color: #fff;
}

.btn-danger:hover:not(:disabled) {
  background: color-mix(in srgb, var(--error) 85%, #000);
}

.btn-success {
  background: var(--success);
  color: #fff;
}

.btn-sm {
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--text-xs);
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: var(--space-md) var(--space-xl);
  font-size: var(--text-base);
}

.btn-icon {
  padding: var(--space-sm);
  width: 2.25rem;
  height: 2.25rem;
}

.btn-group {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

/* ── Timer Display ────────────────────────────────────────── */

.timer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-lg);
}

.timer-display {
  font-size: var(--text-3xl);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  font-family: var(--font-mono);
  color: var(--timer-normal);
  transition: color 0.3s;
  line-height: 1;
}

.timer-display.warning {
  color: var(--timer-warning);
}

.timer-display.critical {
  color: var(--timer-critical);
  animation: pulse-red 1s ease-in-out infinite;
}

.timer-display.paused {
  color: var(--timer-paused);
}

.timer-display.complete {
  color: var(--timer-paused);
}

@keyframes pulse-red {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.timer-label {
  font-size: var(--text-sm);
  color: var(--text-dim);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.timer-progress {
  width: 100%;
  max-width: 16rem;
  height: 0.375rem;
  background: var(--border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.timer-progress-fill {
  height: 100%;
  background: var(--timer-normal);
  border-radius: var(--radius-full);
  transition: width 1s linear, background 0.3s;
}

.timer-progress-fill.warning {
  background: var(--timer-warning);
}

.timer-progress-fill.critical {
  background: var(--timer-critical);
}

.timer-controls {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
}

/* Compact timer bar (for tool header) */
.timer-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
}

.timer-bar .timer-display {
  font-size: var(--text-xl);
  padding: 0;
}

/* ── Modal ────────────────────────────────────────────────── */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: color-mix(in srgb, var(--shadow-color) 55%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--space-md);
  opacity: 0;
  transition: opacity 0.2s;
}

.modal-overlay.visible {
  opacity: 1;
}

.modal {
  background: var(--surface);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 28rem;
  max-height: calc(100vh - var(--space-xl));
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 60px color-mix(in srgb, var(--shadow-color) 30%, transparent);
  transform: translateY(0.5rem) scale(0.97);
  transition: transform 0.2s, opacity 0.2s;
}

.modal-overlay.visible .modal {
  transform: translateY(0) scale(1);
}

.modal-lg {
  max-width: 48rem;
}

.modal-header {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.modal-title {
  font-size: var(--text-lg);
  font-weight: 700;
}

.modal-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-dim);
  font-size: var(--text-xl);
  padding: var(--space-xs);
  border-radius: var(--radius);
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s;
}

.modal-close:hover {
  background: var(--bg);
  color: var(--text);
}

.modal-body {
  padding: var(--space-lg);
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: var(--space-sm);
  flex-shrink: 0;
}

/* ── Badges ───────────────────────────────────────────────── */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25em;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.badge-default    { background: var(--bg); color: var(--text-dim); border: 1px solid var(--border); }
.badge-accent     { background: color-mix(in srgb, var(--accent) 15%, transparent); color: var(--accent); }
.badge-success    { background: var(--success-bg); color: var(--success-text); }
.badge-error      { background: var(--error-bg); color: var(--error-text); }
.badge-warning    { background: var(--warning-bg); color: var(--warning-text); }
.badge-info       { background: var(--info-bg); color: var(--info-text); }
.badge-planning   { background: var(--color-planning-bg); color: var(--color-planning); }
.badge-completed  { background: var(--color-completed-bg); color: var(--color-completed); }

/* ── Alerts ───────────────────────────────────────────────── */

.alert {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius);
  font-size: var(--text-sm);
  border: 1px solid transparent;
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
}

.alert-success { background: var(--success-bg); color: var(--success-text); border-color: color-mix(in srgb, var(--success) 40%, transparent); }
.alert-error   { background: var(--error-bg);   color: var(--error-text);   border-color: color-mix(in srgb, var(--error)   40%, transparent); }
.alert-warning { background: var(--warning-bg); color: var(--warning-text); border-color: color-mix(in srgb, var(--warning) 40%, transparent); }
.alert-info    { background: var(--info-bg);    color: var(--info-text);    border-color: color-mix(in srgb, var(--accent)  30%, transparent); }

/* ── Idea List (for brainstorming outputs) ────────────────── */

.idea-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.idea-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: var(--text-sm);
}

.idea-item .idea-num {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--text-dim);
  min-width: 1.5rem;
  margin-top: 0.1rem;
}

.idea-item .idea-text {
  flex: 1;
}

.idea-item .idea-actions {
  display: flex;
  gap: var(--space-xs);
  opacity: 0;
  transition: opacity 0.15s;
}

.idea-item:hover .idea-actions {
  opacity: 1;
}

/* ── Dot Voting ───────────────────────────────────────────── */

.dot-vote {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

.dot {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  transition: transform 0.1s;
}

.dot:hover {
  transform: scale(1.3);
}

.dot.empty {
  background: var(--border);
}

/* ── Utility: Section ─────────────────────────────────────── */

.section {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  margin-bottom: var(--space-lg);
  overflow: hidden;
}

.section-header {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.section-title {
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.section-body {
  padding: var(--space-lg);
}

/* ── Divider ──────────────────────────────────────────────── */

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-lg) 0;
}

/* ── Empty State ──────────────────────────────────────────── */

.empty-state {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  color: var(--text-dim);
}

.empty-state .empty-icon {
  font-size: 3rem;
  line-height: 1;
  margin-bottom: var(--space-md);
}

.empty-state h3 {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--space-xs);
}

.empty-state p {
  font-size: var(--text-sm);
}

/* ── Footer ───────────────────────────────────────────────── */

.page-footer {
  text-align: center;
  padding: var(--space-xl) 0;
  color: var(--text-dim);
  font-size: var(--text-xs);
  border-top: 1px solid var(--border);
  margin-top: var(--space-2xl);
}

/* ── Utility classes ──────────────────────────────────────── */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-center { text-align: center; }
.text-right  { text-align: right; }
.text-dim    { color: var(--text-dim); }
.text-accent { color: var(--accent); }
.text-sm     { font-size: var(--text-sm); }
.text-xs     { font-size: var(--text-xs); }
.font-bold   { font-weight: 700; }
.mt-sm       { margin-top: var(--space-sm); }
.mt-md       { margin-top: var(--space-md); }
.mt-lg       { margin-top: var(--space-lg); }
.mb-sm       { margin-bottom: var(--space-sm); }
.mb-md       { margin-bottom: var(--space-md); }
.mb-lg       { margin-bottom: var(--space-lg); }
.flex        { display: flex; }
.flex-col    { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-sm      { gap: var(--space-sm); }
.gap-md      { gap: var(--space-md); }
.w-full      { width: 100%; }
.hidden      { display: none !important; }

/* ── Responsive adjustments ──────────────────────────────── */
/* Tablet: 768px */
@media (min-width: 48rem) {
  .container { padding: 0 var(--space-lg); }

  .quadrant-grid { min-height: 32rem; }
  .quadrant { min-height: 16rem; }

  .timer-display { font-size: calc(var(--text-3xl) * 1.3); }

  .modal { max-width: 32rem; }
}

/* Desktop: 1024px */
@media (min-width: 64rem) {
  .container { padding: 0 var(--space-xl); }

  .sticky-board { grid-template-columns: repeat(auto-fill, minmax(12rem, 1fr)); }

  .modal-lg { max-width: 52rem; }
}

/* Mobile-only adjustments: < 768px */
@media (max-width: 47.9375rem) {
  .quadrant-grid {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }

  .quadrant {
    min-height: 10rem;
  }

  .timer-display { font-size: var(--text-2xl); }

  .page-actions { width: 100%; }

  .modal { max-height: 90vh; }

  .card-footer { flex-wrap: wrap; }
}