:root {
  --bg: #eef2f7;
  --card: #ffffff;
  --text: #0b1220;
  --muted: #334155;
  --primary: #22d3ee;
  --danger: #fb7185;
  --border: #b7c3d3;
  --ad-height: 96px;
  --link: #0b5fff;
  --link-hover: #0847bf;
  --link-visited: #6d28d9;
}

html[data-theme="dark"] {
  --bg: #020617;
  --card: #0f172a;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --border: #334155;
  --link: #67b3ff;
  --link-hover: #99cfff;
  --link-visited: #c4a5ff;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  position: relative;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, color-mix(in srgb, var(--primary) 12%, var(--bg)), var(--bg) 45%);
  color: var(--text);
  line-height: 1.5;
  padding-bottom: calc(var(--ad-height) + env(safe-area-inset-bottom) + 20px);
}

.skip-link {
  position: absolute;
  left: 12px;
  top: 0;
  z-index: 30;
  padding: 10px 14px;
  background: var(--card);
  color: var(--text);
  border: 2px solid var(--primary);
  border-radius: 10px;
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-120%);
  transition: transform 160ms ease, opacity 160ms ease;
}

.skip-link:focus {
  transform: translateY(12px);
  outline: none;
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--primary) 55%, transparent);
}

.toast {
  position: fixed;
  top: calc(10px + env(safe-area-inset-top));
  left: 50%;
  transform: translate(-50%, -8px);
  z-index: 20;
  background: color-mix(in srgb, var(--primary) 30%, var(--card));
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 9px 14px;
  font-size: 0.9rem;
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.18);
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

@media (prefers-reduced-motion: reduce) {
  .toast,
  .skip-link {
    transition: none;
  }
}

.app-header {
  position: relative;
  padding: 20px 16px 8px;
  text-align: center;
}

h1 {
  margin: 0;
  font-size: 1.5rem;
}

.subtitle {
  margin: 4px 0 0;
  color: var(--muted);
}

.tab-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  width: min(320px, 100%);
  gap: 8px;
  margin-top: 10px;
  margin-inline: auto;
}

.tab-btn {
  font-size: 0.9rem;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 7px 10px;
  background: var(--card);
  width: 100%;
  text-align: center;
}

.tab-btn:hover {
  border-color: var(--primary);
  color: var(--text);
}

.tab-btn.active {
  color: var(--text);
  border-color: var(--primary);
  background: color-mix(in srgb, var(--primary) 16%, var(--card));
}

#themeSelect,
#langSelect {
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 6px 10px;
}

.header-controls {
  position: absolute;
  top: 16px;
  right: 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  max-width: min(100%, 280px);
}

.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;
}

.app-main {
  max-width: 680px;
  margin: 0 auto;
  padding: 12px 16px 24px;
}

.app-footer {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 16px 24px;
}

.timer-card,
.log-card,
.info-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 14px;
}

.info-card {
  font-size: 0.9rem;
  color: var(--muted);
}

.info-card p {
  margin: 0 0 8px;
}

.offline-hint {
  margin: 0 0 8px;
  padding: 8px 10px;
  font-size: 0.85rem;
  line-height: 1.45;
  color: var(--muted);
  background: color-mix(in srgb, var(--primary) 12%, var(--card));
  border: 1px solid var(--border);
  border-radius: 10px;
}

.info-links {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.guide-list {
  margin: 8px 0 14px;
  padding-left: 18px;
}

.time-display {
  font-size: clamp(2rem, 11vw, 3.5rem);
  font-weight: 800;
  text-align: center;
  letter-spacing: 0.04em;
}

.status {
  margin: 4px 0 14px;
  text-align: center;
  color: var(--muted);
}

.preset-group,
.controls {
  display: grid;
  gap: 8px;
  margin-bottom: 12px;
}

.preset-group {
  grid-template-columns: repeat(4, 1fr);
}

.controls {
  grid-template-columns: repeat(3, 1fr);
}

.custom-form {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin: 8px 0 12px;
  align-items: end;
}

.custom-form .form-error {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--danger);
}

.custom-form label {
  display: grid;
  gap: 4px;
  font-size: 0.9rem;
}

.custom-form input,
.custom-form button {
  min-height: 42px;
}

input,
button {
  border-radius: 10px;
  border: 1px solid var(--border);
  font: inherit;
  color: var(--text);
  background: var(--card);
  padding: 10px;
}

button {
  cursor: pointer;
}

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

button:active {
  transform: translateY(1px);
}

button:disabled {
  opacity: 1;
  color: color-mix(in srgb, var(--muted) 80%, #94a3b8);
  border-color: color-mix(in srgb, var(--border) 70%, var(--muted));
  background: color-mix(in srgb, var(--card) 75%, var(--bg));
  cursor: not-allowed;
}

#startBtn {
  background: color-mix(in srgb, var(--primary) 24%, var(--card));
}

.secondary {
  color: var(--muted);
}

.log-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.log-backup-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 10px;
}

.log-backup-tools .btn-log-backup {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 6px 12px;
  min-height: 0;
  line-height: 1.25;
  border-radius: 8px;
}

.log-list {
  list-style: none;
  padding: 0;
  margin: 12px 0 0;
  display: grid;
  gap: 10px;
}

.log-day-group {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: color-mix(in srgb, var(--card) 96%, var(--bg));
  overflow: hidden;
}

.log-day-summary {
  cursor: pointer;
  list-style: none;
  padding: 10px 12px;
  font-weight: 600;
  color: var(--text);
  background: color-mix(in srgb, var(--card) 90%, var(--bg));
  border-bottom: 1px solid transparent;
}

.log-day-group[open] .log-day-summary {
  border-bottom-color: var(--border);
}

.log-day-summary::-webkit-details-marker {
  display: none;
}

.log-day-list {
  list-style: none;
  margin: 0;
  padding: 10px;
  display: grid;
  gap: 10px;
}

.log-item {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  display: grid;
  gap: 8px;
  background: color-mix(in srgb, var(--card) 90%, var(--bg));
}

.log-top {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: center;
}

.log-meta {
  color: var(--muted);
  font-size: 0.85rem;
}

.log-item textarea {
  width: 100%;
  min-height: 84px;
  resize: none;
}

.log-memo {
  margin: 0;
  white-space: pre-wrap;
  color: var(--text);
}

.log-memo.empty {
  color: var(--muted);
}

.log-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.log-actions button {
  font-size: 0.86rem;
  padding: 6px 10px;
  min-height: 34px;
}

.delete-btn {
  border-color: color-mix(in srgb, var(--danger) 55%, var(--border));
}

.empty-log {
  color: var(--muted);
  margin: 12px 0 0;
}

.ad-slot {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 5;
  min-height: var(--ad-height);
  border-top: 1px solid var(--border);
  background: var(--bg);
  padding: 8px 12px calc(8px + env(safe-area-inset-bottom));
}

.ad-label {
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 4px;
}

#adsense-anchor-placeholder {
  height: 58px;
  border: 1px dashed #475569;
  border-radius: 8px;
  display: grid;
  place-items: center;
  color: var(--muted);
}

.policy-modal {
  border: 1px solid var(--border);
  border-radius: 14px;
  width: min(640px, calc(100% - 24px));
  background: var(--card);
  color: var(--text);
}

.policy-modal article {
  box-sizing: border-box;
  max-height: min(78vh, 620px);
  overflow-y: auto;
  padding: 12px 16px 10px;
}

.policy-modal .policy-subheading {
  margin: 14px 0 6px;
  font-size: 1rem;
  font-weight: 700;
}

.policy-modal .policy-subheading:first-of-type {
  margin-top: 10px;
}

.policy-modal .policy-para-small {
  margin: 0 0 8px;
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.45;
}

.guide-intro {
  margin: 0 0 14px;
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.45;
}

.guide-section {
  margin-bottom: 14px;
}

.guide-section:last-of-type {
  margin-bottom: 10px;
}

.guide-section h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 700;
}

.guide-para {
  margin: 0 0 8px;
  font-size: 0.92rem;
  line-height: 1.5;
}

.guide-para:last-child {
  margin-bottom: 0;
}

.policy-modal::backdrop {
  background: rgba(2, 6, 23, 0.72);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 12px;
  padding-top: 10px;
  position: sticky;
  bottom: 0;
  background: linear-gradient(
    to bottom,
    color-mix(in srgb, var(--card) 0%, transparent) 0%,
    var(--card) 12px
  );
}

.modal-actions-row {
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 10px;
}

.link-like {
  background: transparent;
  color: var(--link);
  border: none;
  text-decoration: underline;
  padding: 4px;
}

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

a:visited {
  color: var(--link-visited);
}

a:hover,
a:focus-visible,
.link-like:hover,
.link-like:focus-visible {
  color: var(--link-hover);
}

.ellipsis-btn {
  width: 100%;
  margin: 0;
  letter-spacing: 0.2px;
  font-weight: 700;
  font-size: 0.82rem;
}

.preset-btn.active-preset {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--primary) 55%, transparent) inset;
}

.custom-wrap[hidden] {
  display: none;
}

.policy-modal a {
  color: var(--link);
}

@media (max-width: 540px) {
  .header-controls {
    position: static;
    justify-content: center;
    max-width: none;
    margin-bottom: 6px;
  }

  .custom-form {
    grid-template-columns: 1fr 1fr;
  }

  .custom-form button {
    grid-column: 1 / -1;
  }
}