:root,
[data-theme="light"] {
  color-scheme: light;
  --bg: #FFFDF8;
  --surface: #FFFFFF;
  --surface-muted: #FAF5E9;
  --text: #2B2B2B;
  --text-secondary: #6B7280;
  --border: #EADFCB;
  --primary: #10B981;
  --primary-hover: #059669;
  --success: #22C55E;
  --danger: #EF4444;
  --shadow: 0 20px 45px color-mix(in srgb, var(--text) 12%, transparent);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111827;
  --surface: #1A2333;
  --surface-muted: #243041;
  --text: #F3F4F6;
  --text-secondary: #9CA3AF;
  --border: #334155;
  --primary: #34D399;
  --primary-hover: #10B981;
  --success: #4ADE80;
  --danger: #F87171;
  --shadow: 0 24px 60px color-mix(in srgb, var(--text) 20%, transparent);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", sans-serif;
  background:
    radial-gradient(circle at top left, color-mix(in srgb, var(--primary) 14%, transparent), transparent 34%),
    radial-gradient(circle at bottom right, color-mix(in srgb, var(--surface-muted) 70%, transparent), transparent 26%),
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--bg) 88%, var(--surface) 12%) 0%,
      var(--bg) 48%,
      color-mix(in srgb, var(--bg) 82%, var(--surface-muted) 18%) 100%
    );
  color: var(--text);
}

body.modal-open {
  overflow: hidden;
}

button,
input {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

input {
  appearance: none;
}

.todo-shell {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding:
    max(88px, calc(env(safe-area-inset-top) + 24px))
    max(18px, env(safe-area-inset-right))
    max(36px, env(safe-area-inset-bottom))
    max(18px, env(safe-area-inset-left));
}

.page-tools {
  position: fixed;
  top: max(18px, calc(env(safe-area-inset-top) + 18px));
  right: max(18px, calc(env(safe-area-inset-right) + 18px));
  z-index: 24;
}

.todo-card {
  width: min(100%, 940px);
  padding: 32px;
  border: 1px solid color-mix(in srgb, var(--border) 82%, var(--surface));
  border-radius: 36px;
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  box-shadow: var(--shadow);
  backdrop-filter: blur(22px);
}

.app-header {
  margin-bottom: 24px;
}

.app-nav {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.hero-copy-block {
  min-width: 0;
}

.eyebrow,
.section-label {
  margin: 0 0 8px;
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow {
  color: var(--primary);
}

.app-header h1 {
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  line-height: 1.04;
  letter-spacing: -0.04em;
}

.hero-copy {
  max-width: 34rem;
  margin: 12px 0 0;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  align-items: center;
}

.hero-stats {
  min-width: 122px;
  padding: 16px 18px;
  border: 1px solid color-mix(in srgb, var(--primary) 22%, var(--border));
  border-radius: 24px;
  background: linear-gradient(
    180deg,
    color-mix(in srgb, var(--surface) 88%, var(--primary)),
    color-mix(in srgb, var(--surface-muted) 90%, var(--surface))
  );
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
}

.stat-label {
  margin-top: 6px;
  display: block;
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.composer-card,
.group-card,
.empty-state {
  border: 1px solid color-mix(in srgb, var(--border) 82%, var(--surface));
  background: color-mix(in srgb, var(--surface-muted) 82%, var(--surface));
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--surface) 76%, transparent);
}

.composer-card {
  margin-bottom: 24px;
  padding: 24px;
  border-radius: 28px;
  display: grid;
  gap: 18px;
}

.composer-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
}

.composer-heading h2,
.group-title,
.empty-state h2,
.modal-heading h2 {
  margin: 0;
  letter-spacing: -0.02em;
}

.section-copy,
.modal-note {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.94rem;
  line-height: 1.55;
}

.composer {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) repeat(2, minmax(148px, 0.7fr)) auto;
  gap: 12px;
  align-items: end;
}

.field,
.field-grid {
  min-width: 0;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.field-label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 600;
}

.todo-input {
  width: 100%;
  min-height: 52px;
  padding: 14px 16px;
  border: 1px solid color-mix(in srgb, var(--border) 82%, var(--surface));
  border-radius: 18px;
  background: color-mix(in srgb, var(--surface) 94%, var(--surface-muted));
  color: var(--text);
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease, background-color 0.2s ease;
}

.todo-input::placeholder {
  color: var(--text-secondary);
}

.todo-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--primary) 18%, transparent);
  background: var(--surface);
}

.primary-button,
.ghost-button,
.danger-button,
.theme-toggle,
.fab-button {
  min-height: 46px;
  border: 1px solid transparent;
  border-radius: 16px;
  font-weight: 700;
  transition: transform 0.18s ease, background-color 0.18s ease, border-color 0.18s ease, opacity 0.18s ease;
}

.primary-button:hover,
.ghost-button:hover,
.danger-button:hover,
.theme-toggle:hover,
.fab-button:hover {
  transform: translateY(-1px);
}

.primary-button:disabled,
.ghost-button:disabled,
.danger-button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.primary-button {
  padding: 0 18px;
  background: var(--primary);
  border-color: var(--primary);
  color: var(--surface);
}

.primary-button:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}

.ghost-button {
  padding: 0 16px;
  background: color-mix(in srgb, var(--surface-muted) 76%, var(--surface));
  border-color: color-mix(in srgb, var(--border) 86%, var(--surface));
  color: var(--text);
}

.ghost-button:hover,
.theme-toggle:hover {
  background: color-mix(in srgb, var(--surface) 68%, var(--surface-muted));
  border-color: color-mix(in srgb, var(--primary) 20%, var(--border));
}

.danger-button {
  padding: 0 16px;
  background: color-mix(in srgb, var(--danger) 12%, var(--surface));
  border-color: color-mix(in srgb, var(--danger) 18%, var(--border));
  color: var(--danger);
}

.danger-button:hover {
  background: color-mix(in srgb, var(--danger) 16%, var(--surface));
}

.theme-toggle {
  width: 48px;
  min-width: 48px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--surface) 82%, var(--surface-muted));
  border-color: color-mix(in srgb, var(--border) 86%, var(--surface));
  color: var(--text);
}

.page-theme-toggle {
  border-color: color-mix(in srgb, var(--border) 74%, var(--surface));
  background: color-mix(in srgb, var(--surface) 90%, transparent);
  box-shadow: 0 10px 28px color-mix(in srgb, var(--text) 12%, transparent);
  backdrop-filter: blur(18px);
}

.theme-toggle-icon {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.theme-toggle-icon circle {
  fill: currentColor;
  stroke: none;
}

.list-panel,
.task-groups {
  display: grid;
  gap: 18px;
}

.group-card {
  padding: 18px;
  border-radius: 28px;
}

.group-card.group-upcoming {
  border-color: color-mix(in srgb, var(--primary) 18%, var(--border));
}

.group-card.group-expired {
  border-color: color-mix(in srgb, var(--danger) 16%, var(--border));
}

.group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.group-label {
  margin-bottom: 4px;
}

.group-title {
  font-size: 1.08rem;
}

.group-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  min-height: 34px;
  padding: 4px 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 74%, var(--surface-muted));
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 700;
}

.todo-list {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  list-style: none;
}

.todo-item {
  display: grid;
  gap: 14px;
  padding: 18px;
  border: 1px solid color-mix(in srgb, var(--border) 84%, var(--surface));
  border-radius: 24px;
  background: color-mix(in srgb, var(--surface) 94%, var(--surface-muted));
}

.todo-item.is-completed {
  border-color: color-mix(in srgb, var(--success) 22%, var(--border));
  background: color-mix(in srgb, var(--success) 10%, var(--surface));
}

.todo-main {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.toggle-button {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 2px solid color-mix(in srgb, var(--text-secondary) 42%, var(--border));
  border-radius: 999px;
  background: var(--surface);
}

.toggle-button::after {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--surface);
  transform: scale(0);
  transition: transform 0.15s ease;
}

.todo-item.is-completed .toggle-button {
  border-color: var(--success);
  background: var(--success);
}

.todo-item.is-completed .toggle-button::after {
  transform: scale(1);
}

.todo-content {
  min-width: 0;
}

.todo-topline {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.todo-text {
  display: block;
  font-size: 1.02rem;
  font-weight: 600;
  line-height: 1.45;
  word-break: break-word;
}

.todo-item.is-completed .todo-text {
  color: var(--text-secondary);
  text-decoration: line-through;
  opacity: 0.78;
}

.todo-badge {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
}

.todo-badge.badge-upcoming {
  background: color-mix(in srgb, var(--primary) 12%, var(--surface));
  color: var(--primary);
}

.todo-badge.badge-expired {
  background: color-mix(in srgb, var(--danger) 14%, var(--surface));
  color: var(--danger);
}

.todo-badge.badge-completed {
  background: color-mix(in srgb, var(--success) 14%, var(--surface));
  color: var(--success);
}

.todo-meta-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  margin-top: 10px;
}

.todo-meta {
  color: var(--text-secondary);
  font-size: 0.86rem;
}

.item-actions {
  display: flex;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 10px;
}

.empty-state {
  min-height: 240px;
  padding: 28px;
  border-radius: 28px;
  display: grid;
  place-items: center;
  text-align: center;
}

.empty-state[hidden] {
  display: none;
}

.empty-state p,
.group-empty {
  max-width: 26rem;
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.6;
}

.group-empty {
  padding: 18px;
  border-radius: 20px;
  text-align: center;
  background: color-mix(in srgb, var(--surface) 62%, var(--surface-muted));
}

.fab-button {
  position: fixed;
  right: max(18px, calc(env(safe-area-inset-right) + 18px));
  bottom: max(18px, calc(env(safe-area-inset-bottom) + 18px));
  z-index: 20;
  display: none;
  align-items: center;
  gap: 10px;
  padding: 0 18px;
  border-radius: 999px;
  background: var(--primary);
  color: var(--surface);
  box-shadow: var(--shadow);
}

.fab-icon {
  font-size: 1.35rem;
  line-height: 1;
}

.modal-shell[hidden] {
  display: none;
}

.modal-shell {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  padding:
    max(24px, env(safe-area-inset-top))
    max(16px, env(safe-area-inset-right))
    max(24px, env(safe-area-inset-bottom))
    max(16px, env(safe-area-inset-left));
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, var(--text) 14%, transparent);
  backdrop-filter: blur(18px);
}

.modal-sheet {
  position: relative;
  width: min(100%, 560px);
  max-height: min(760px, 100%);
  display: grid;
  grid-template-rows: auto 1fr;
  border: 1px solid color-mix(in srgb, var(--border) 82%, var(--surface));
  border-radius: 30px;
  background: color-mix(in srgb, var(--surface) 96%, transparent);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.modal-header {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 18px 20px 14px;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 80%, var(--surface));
}

.modal-heading {
  min-width: 0;
  text-align: center;
}

.modal-utility,
.modal-save {
  min-width: 72px;
}

.modal-body {
  padding: 20px;
  overflow: auto;
}

.sheet-card {
  display: grid;
  gap: 14px;
  padding: 18px;
  border: 1px solid color-mix(in srgb, var(--border) 82%, var(--surface));
  border-radius: 24px;
  background: color-mix(in srgb, var(--surface-muted) 80%, var(--surface));
}

.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;
}

@media (max-width: 820px) {
  .todo-shell {
    align-items: start;
    padding-top: max(84px, calc(env(safe-area-inset-top) + 18px));
    padding-bottom: max(96px, env(safe-area-inset-bottom));
  }

  .todo-card {
    padding: 24px 18px;
    border-radius: 30px;
  }

  .app-nav,
  .hero-actions,
  .composer-heading,
  .group-header,
  .todo-topline {
    display: grid;
  }

  .hero-actions {
    grid-template-columns: 1fr;
    align-items: center;
  }

  .hero-stats {
    justify-self: stretch;
  }

  .composer-card {
    display: none;
  }

  .fab-button {
    display: inline-flex;
  }

  .todo-item {
    padding: 16px;
  }

  .item-actions button {
    flex: 1 1 0;
  }

  .modal-shell {
    place-items: end stretch;
    padding: 0;
  }

  .modal-sheet {
    width: 100%;
    max-height: min(100dvh, 100%);
    border-right: none;
    border-bottom: none;
    border-left: none;
    border-radius: 28px 28px 0 0;
  }

  .modal-header {
    padding:
      max(14px, env(safe-area-inset-top))
      max(16px, env(safe-area-inset-right))
      14px
      max(16px, env(safe-area-inset-left));
  }

  .modal-body {
    padding:
      20px
      max(16px, env(safe-area-inset-right))
      max(24px, env(safe-area-inset-bottom))
      max(16px, env(safe-area-inset-left));
  }
}

@media (max-width: 640px) {
  .todo-shell {
    padding-right: max(12px, env(safe-area-inset-right));
    padding-left: max(12px, env(safe-area-inset-left));
  }

  .page-tools {
    top: max(12px, calc(env(safe-area-inset-top) + 12px));
    right: max(12px, calc(env(safe-area-inset-right) + 12px));
  }

  .todo-card {
    padding: 20px 16px;
    border-radius: 26px;
  }

  .app-header h1 {
    font-size: 2rem;
  }

  .hero-copy {
    font-size: 0.95rem;
  }

  .field-grid {
    grid-template-columns: 1fr;
  }

  .item-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .fab-button {
    right: max(12px, calc(env(safe-area-inset-right) + 12px));
    left: max(12px, calc(env(safe-area-inset-left) + 12px));
    justify-content: center;
  }
}