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

:root,
html[data-theme="black"] {
  --bg: #000000;
  --bg-overlay: rgba(0, 0, 0, 0.92);
  --surface: #0a0a0a;
  --surface-raised: #111111;
  --border: #222222;
  --border-soft: #333333;
  --text: #f5f5f5;
  --text-muted: #888888;
  --text-subtle: #777777;
  --btn-bg: #111111;
  --btn-primary-bg: #ffffff;
  --btn-primary-text: #000000;
  --spinner-track: rgba(255, 255, 255, 0.2);
  --spinner-head: #ffffff;
  --backdrop: rgba(0, 0, 0, 0.6);
}

html[data-theme="white"] {
  --bg: #ffffff;
  --bg-overlay: rgba(255, 255, 255, 0.92);
  --surface: #f5f5f5;
  --surface-raised: #ffffff;
  --border: #dddddd;
  --border-soft: #cccccc;
  --text: #111111;
  --text-muted: #555555;
  --text-subtle: #666666;
  --btn-bg: #ffffff;
  --btn-primary-bg: #111111;
  --btn-primary-text: #ffffff;
  --spinner-track: rgba(0, 0, 0, 0.15);
  --spinner-head: #111111;
  --backdrop: rgba(0, 0, 0, 0.35);
}

html[data-theme="gradient-sunset"] {
  --bg: linear-gradient(160deg, #ff6b6b 0%, #6b2d5c 100%);
  --bg-overlay: rgba(40, 10, 30, 0.82);
  --surface: rgba(20, 10, 20, 0.55);
  --surface-raised: rgba(30, 15, 25, 0.7);
  --border: rgba(255, 255, 255, 0.15);
  --border-soft: rgba(255, 255, 255, 0.25);
  --text: #fff8f5;
  --text-muted: rgba(255, 248, 245, 0.75);
  --text-subtle: rgba(255, 248, 245, 0.65);
  --btn-bg: rgba(255, 255, 255, 0.12);
  --btn-primary-bg: #fff8f5;
  --btn-primary-text: #4a1535;
  --spinner-track: rgba(255, 255, 255, 0.25);
  --spinner-head: #ffffff;
  --backdrop: rgba(20, 0, 10, 0.55);
}

html[data-theme="gradient-ocean"] {
  --bg: linear-gradient(160deg, #0ea5e9 0%, #0f766e 100%);
  --bg-overlay: rgba(5, 40, 50, 0.82);
  --surface: rgba(5, 30, 40, 0.55);
  --surface-raised: rgba(8, 40, 50, 0.7);
  --border: rgba(255, 255, 255, 0.15);
  --border-soft: rgba(255, 255, 255, 0.25);
  --text: #f0fdfa;
  --text-muted: rgba(240, 253, 250, 0.75);
  --text-subtle: rgba(240, 253, 250, 0.65);
  --btn-bg: rgba(255, 255, 255, 0.12);
  --btn-primary-bg: #f0fdfa;
  --btn-primary-text: #0f4c5c;
  --spinner-track: rgba(255, 255, 255, 0.25);
  --spinner-head: #ffffff;
  --backdrop: rgba(0, 20, 30, 0.55);
}

html[data-theme="gradient-forest"] {
  --bg: linear-gradient(160deg, #166534 0%, #052e16 100%);
  --bg-overlay: rgba(5, 30, 15, 0.82);
  --surface: rgba(5, 25, 12, 0.55);
  --surface-raised: rgba(8, 35, 18, 0.7);
  --border: rgba(255, 255, 255, 0.12);
  --border-soft: rgba(255, 255, 255, 0.22);
  --text: #f0fdf4;
  --text-muted: rgba(240, 253, 244, 0.75);
  --text-subtle: rgba(240, 253, 244, 0.65);
  --btn-bg: rgba(255, 255, 255, 0.1);
  --btn-primary-bg: #f0fdf4;
  --btn-primary-text: #14532d;
  --spinner-track: rgba(255, 255, 255, 0.2);
  --spinner-head: #ffffff;
  --backdrop: rgba(0, 15, 5, 0.55);
}

html[data-theme="gradient-midnight"] {
  --bg: linear-gradient(160deg, #4338ca 0%, #1e1b4b 100%);
  --bg-overlay: rgba(15, 10, 40, 0.85);
  --surface: rgba(15, 12, 35, 0.55);
  --surface-raised: rgba(20, 16, 45, 0.72);
  --border: rgba(255, 255, 255, 0.12);
  --border-soft: rgba(255, 255, 255, 0.22);
  --text: #eef2ff;
  --text-muted: rgba(238, 242, 255, 0.75);
  --text-subtle: rgba(238, 242, 255, 0.65);
  --btn-bg: rgba(255, 255, 255, 0.1);
  --btn-primary-bg: #eef2ff;
  --btn-primary-text: #312e81;
  --spinner-track: rgba(255, 255, 255, 0.2);
  --spinner-head: #ffffff;
  --backdrop: rgba(5, 0, 20, 0.6);
}

html[data-theme="gradient-slate"] {
  --bg: linear-gradient(160deg, #64748b 0%, #0f172a 100%);
  --bg-overlay: rgba(10, 15, 25, 0.85);
  --surface: rgba(15, 20, 30, 0.55);
  --surface-raised: rgba(20, 25, 35, 0.72);
  --border: rgba(255, 255, 255, 0.12);
  --border-soft: rgba(255, 255, 255, 0.22);
  --text: #f8fafc;
  --text-muted: rgba(248, 250, 252, 0.75);
  --text-subtle: rgba(248, 250, 252, 0.65);
  --btn-bg: rgba(255, 255, 255, 0.1);
  --btn-primary-bg: #f8fafc;
  --btn-primary-text: #0f172a;
  --spinner-track: rgba(255, 255, 255, 0.2);
  --spinner-head: #ffffff;
  --backdrop: rgba(0, 5, 15, 0.6);
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  background-attachment: fixed;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

.hidden {
  display: none !important;
}

.loader {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: #000;
  z-index: 100;
}

.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--spinner-track);
  border-top-color: var(--spinner-head);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--bg-overlay);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
}

.sync-status {
  margin: 0.25rem 0 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  gap: 0.5rem;
}

.icon-btn {
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--border-soft);
  border-radius: 0.5rem;
  background: var(--btn-bg);
  color: var(--text);
  cursor: pointer;
}

.icon-btn:hover {
  opacity: 0.85;
}

.main {
  flex: 1;
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem 1.25rem 2rem;
}

.empty-state,
.setup-state {
  margin-top: 2rem;
  padding: 1.5rem;
  border: 1px dashed var(--border-soft);
  border-radius: 0.75rem;
  text-align: center;
  color: var(--text-muted);
  background: var(--surface);
}

.empty-state h2,
.setup-state h2 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  color: var(--text);
}

.empty-state p,
.setup-state p {
  margin: 0.5rem 0;
  line-height: 1.5;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border-soft);
  background: var(--btn-bg);
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
}

.btn.primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  border-color: var(--btn-primary-bg);
}

.btn:hover {
  opacity: 0.9;
}

.lists-grid {
  display: grid;
  gap: 1rem;
}

@media (min-width: 641px) {
  .lists-grid.multi-column {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.list-card {
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--surface);
  overflow: hidden;
  backdrop-filter: blur(8px);
}

.list-card-header {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.list-card-header h2 {
  margin: 0;
  font-size: 0.9375rem;
  font-weight: 600;
}

.list-count {
  font-size: 0.75rem;
  color: var(--text-subtle);
}

.reminder-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.reminder-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--border);
}

.reminder-item:last-child {
  border-bottom: none;
}

.reminder-check {
  width: 1rem;
  height: 1rem;
  margin-top: 0.125rem;
  flex-shrink: 0;
}

.reminder-body {
  min-width: 0;
  flex: 1;
}

.reminder-title {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.4;
  word-break: break-word;
}

.reminder-meta {
  margin: 0.25rem 0 0;
  font-size: 0.75rem;
  color: var(--text-subtle);
}

.reminder-notes {
  margin: 0.25rem 0 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.settings {
  position: fixed;
  inset: 0;
  z-index: 50;
}

.settings-backdrop {
  position: absolute;
  inset: 0;
  background: var(--backdrop);
}

.settings-sheet {
  position: absolute;
  inset: 0;
  background: var(--surface-raised);
  display: flex;
  flex-direction: column;
  overflow: auto;
}

.settings-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 1.25rem 1rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--surface-raised);
  z-index: 2;
}

.settings-header h2 {
  margin: 0;
  font-size: 1.375rem;
}

.settings-subtitle {
  margin: 0.25rem 0 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.setup-progress {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 4.5rem;
  background: var(--surface-raised);
  z-index: 1;
}

.progress-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.375rem;
  min-width: 4.5rem;
}

.progress-dot {
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.75rem;
  font-weight: 700;
  border: 2px solid var(--border-soft);
  color: var(--text-muted);
  background: var(--btn-bg);
}

.progress-step.is-active .progress-dot,
.progress-step.is-done .progress-dot {
  border-color: var(--text);
  color: var(--btn-primary-text);
  background: var(--btn-primary-bg);
}

.progress-label {
  font-size: 0.6875rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.progress-step.is-active .progress-label {
  color: var(--text);
  font-weight: 600;
}

.progress-line {
  width: 2rem;
  height: 2px;
  background: var(--border-soft);
  margin-bottom: 1.25rem;
}

.settings-body {
  padding: 1rem 1.25rem 2.5rem;
  display: grid;
  gap: 1rem;
  max-width: 640px;
  margin: 0 auto;
  width: 100%;
}

.setup-card {
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.25rem;
  background: var(--surface);
  display: grid;
  gap: 0.875rem;
}

.setup-card.is-locked {
  opacity: 0.55;
  pointer-events: none;
}

.setup-card-muted {
  opacity: 0.95;
}

.card-badge {
  display: inline-flex;
  width: fit-content;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--btn-bg);
  border: 1px solid var(--border-soft);
  color: var(--text-muted);
}

.card-title {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 600;
}

.card-lead {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--text-muted);
}

.card-lead.is-success,
.status-text.is-success {
  color: #4ade80;
}

.status-text.is-error {
  color: #f87171;
}

.hint {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.field {
  display: grid;
  gap: 0.375rem;
}

.field-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text);
}

.input-row {
  display: flex;
  gap: 0.5rem;
}

.input-row input {
  flex: 1;
  min-width: 0;
}

.field input[type="text"],
.field input[type="url"],
.field input[type="password"] {
  width: 100%;
  padding: 0.75rem 0.875rem;
  border-radius: 0.625rem;
  border: 1px solid var(--border-soft);
  background: var(--btn-bg);
  color: var(--text);
}

.btn-block {
  width: 100%;
}

.btn-small {
  padding: 0.5rem 0.75rem;
  font-size: 0.8125rem;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.status-text {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.info-box {
  border: 1px solid var(--border);
  border-radius: 0.625rem;
  padding: 0.75rem 0.875rem;
  background: var(--btn-bg);
  font-size: 0.8125rem;
  line-height: 1.5;
}

.info-box summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--text);
}

.info-box p {
  margin: 0.625rem 0 0;
  color: var(--text-muted);
}

.guide-steps {
  margin: 0;
  padding-left: 1.125rem;
  display: grid;
  gap: 1rem;
  font-size: 0.875rem;
  line-height: 1.55;
}

.guide-steps li {
  padding-left: 0.25rem;
}

.guide-sublist {
  margin: 0.5rem 0 0;
  padding-left: 1.125rem;
  display: grid;
  gap: 0.35rem;
  color: var(--text-muted);
}

.copy-field {
  display: grid;
  gap: 0.375rem;
}

.copy-block {
  display: flex;
  align-items: stretch;
  gap: 0.5rem;
  border: 1px solid var(--border-soft);
  border-radius: 0.625rem;
  background: var(--btn-bg);
  overflow: hidden;
}

.copy-block code {
  flex: 1;
  padding: 0.75rem 0.875rem;
  font-size: 0.8125rem;
  line-height: 1.4;
  word-break: break-all;
  color: var(--text);
}

.copy-block .btn,
.copy-block .copy-btn {
  border: none;
  border-left: 1px solid var(--border-soft);
  border-radius: 0;
  background: transparent;
}

.appearance-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.625rem;
}

.appearance-swatch {
  display: grid;
  gap: 0.375rem;
  padding: 0.5rem;
  border: 2px solid transparent;
  border-radius: 0.625rem;
  background: var(--btn-bg);
  cursor: pointer;
  text-align: left;
}

.appearance-swatch.is-active {
  border-color: var(--text);
}

.appearance-preview {
  display: block;
  height: 2.5rem;
  border-radius: 0.375rem;
  border: 1px solid var(--border-soft);
}

.appearance-label {
  font-size: 0.6875rem;
  color: var(--text-muted);
}

.lists-container {
  display: grid;
  gap: 0.5rem;
}

.list-option {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.75rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: 0.625rem;
  background: var(--btn-bg);
  font-size: 0.9375rem;
}

@media (max-width: 640px) {
  .appearance-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .setup-progress {
    top: 5rem;
  }
}