/* CSS Variables */
:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-tertiary: #0f3460;
  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --accent: #e94560;
  --accent-hover: #ff6b6b;
  --success: #4ecca3;
  --warning: #ffc107;
  --danger: #e94560;
  --border-radius: 12px;
  --transition: 0.2s ease;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

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

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

/* App Container */
#app {
  height: 100%;
  position: relative;
}

/* Screen Management */
.screen {
  display: none;
  flex-direction: column;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}

.screen.active {
  display: flex;
}

/* Header */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--bg-tertiary);
  min-height: 60px;
}

header h1 {
  font-size: 1.25rem;
  font-weight: 600;
  flex: 1;
  text-align: center;
}

header .spacer {
  width: 44px;
}

/* Main Content */
main {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 16px;
  max-width: 100%;
  box-sizing: border-box;
}

/* Footer */
footer {
  padding: 16px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--bg-tertiary);
}

.footer-buttons {
  display: flex;
  gap: 12px;
  align-items: center;
}

.btn-edit-mode {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  padding: 12px;
  border-radius: var(--border-radius);
}

.btn-edit-mode.active {
  background: var(--accent);
  color: var(--text-primary);
}

.footer-buttons .btn-large {
  flex: 1;
}

/* Buttons */
.btn {
  font-family: inherit;
  font-size: 1rem;
  font-weight: 500;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 12px 24px;
}

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

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

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

.btn-secondary:hover, .btn-secondary:active {
  background: var(--bg-secondary);
}

.btn-text {
  background: transparent;
  color: var(--accent);
  padding: 12px;
}

.btn-icon {
  background: transparent;
  color: var(--text-primary);
  font-size: 1.5rem;
  padding: 8px;
}

.btn-small {
  font-size: 0.875rem;
  padding: 8px 16px;
  min-height: 36px;
}

.btn-large {
  width: 100%;
  font-size: 1.125rem;
  padding: 16px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Timer List */
.timer-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.timer-card {
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  padding: 16px;
  box-shadow: var(--shadow);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.timer-card-content {
  flex: 1;
  cursor: pointer;
  transition: opacity var(--transition);
}

.timer-card-content:active {
  opacity: 0.7;
}

.timer-card-name {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.timer-card-details {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.timer-card-reorder {
  display: none;
  flex-direction: column;
  gap: 4px;
  margin-right: 8px;
}

.timer-list.edit-mode .timer-card-reorder {
  display: flex;
}

.btn-reorder {
  background: var(--bg-tertiary);
  border: none;
  color: var(--text-primary);
  font-size: 0.75rem;
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-reorder:hover, .btn-reorder:active {
  background: var(--accent);
}

.timer-card-actions {
  display: none;
  flex-direction: column;
  gap: 8px;
}

.timer-list.edit-mode .timer-card-actions {
  display: flex;
}

.btn-card-action {
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 8px 12px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition);
}

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

.btn-edit:hover, .btn-edit:active {
  background: var(--accent);
}

.btn-delete {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
}

.btn-delete:hover, .btn-delete:active {
  background: var(--danger);
  color: var(--text-primary);
}

.empty-message {
  text-align: center;
  color: var(--text-secondary);
  padding: 48px 16px;
}

.empty-message.hidden {
  display: none;
}

/* Auth Styles */
.error-message {
  color: var(--danger);
  font-size: 0.875rem;
  margin-bottom: 16px;
  text-align: center;
}

.error-message.hidden {
  display: none;
}

.auth-switch {
  text-align: center;
  color: var(--text-secondary);
  margin-top: 24px;
  font-size: 0.875rem;
}

.auth-switch .btn-text {
  font-size: 0.875rem;
  padding: 4px 8px;
}

#login-form,
#signup-form {
  max-width: 400px;
  margin: 0 auto;
}

#signup-form.hidden,
#login-form.hidden {
  display: none;
}

.visit-count {
  font-size: 0.75rem;
  color: var(--text-secondary);
  min-width: 60px;
}

.visit-count:empty {
  display: none;
}

.auth-area {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
}

.user-email {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.user-email:empty {
  display: none;
}

/* Form Styles */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-group input {
  width: 100%;
  padding: 14px;
  font-size: 1rem;
  font-family: inherit;
  background: var(--bg-secondary);
  border: 1px solid var(--bg-tertiary);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  transition: border-color var(--transition);
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.checkbox-group {
  margin-top: 8px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  font-size: 1rem;
  color: var(--text-primary);
}

.checkbox-label input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--accent);
  cursor: pointer;
}

/* Intervals Section */
.intervals-section {
  margin-top: 24px;
  max-width: 100%;
  overflow: hidden;
}

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

.section-header h2 {
  font-size: 1rem;
  font-weight: 600;
}

.intervals-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.btn-add-bottom {
  margin-top: 16px;
  width: 100%;
}

.btn-save-bottom {
  margin-top: 24px;
  width: 100%;
  margin-bottom: 24px;
}

.interval-item {
  display: flex;
  gap: 8px;
  align-items: center;
  background: var(--bg-secondary);
  padding: 10px;
  border-radius: var(--border-radius);
  max-width: 100%;
  box-sizing: border-box;
}

.interval-item input {
  padding: 10px;
  font-size: 0.875rem;
  background: var(--bg-tertiary);
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--text-primary);
  min-width: 0;
  box-sizing: border-box;
}

.interval-item input:focus {
  outline: none;
  border-color: var(--accent);
}

.interval-name {
  flex: 2;
  min-width: 0;
}

.interval-duration {
  flex: 0 0 70px;
  text-align: center;
  width: 70px;
}

.interval-remove {
  background: transparent;
  border: none;
  color: var(--danger);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
}

/* Running Screen */
#running-screen {
  transition: background-color 0.3s ease;
}

#running-screen header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  background: transparent;
  border-bottom: none;
  min-height: auto;
  padding: 8px 16px;
}

#running-screen header h1 {
  display: none;
}

#running-screen.running {
  background-color: #33FF33;
}

#running-screen.running .countdown-display {
  color: #ffffff;
}

#running-screen.running .current-interval-name {
  color: #000000;
}

#running-screen.running .next-interval-name,
#running-screen.running .progress-info {
  color: #000000;
}

#running-screen.running .btn-icon {
  color: #000000;
}

#running-screen.paused {
  background-color: #FF3333;
}

#running-screen.paused .countdown-display {
  color: #ffffff;
}

#running-screen.paused .current-interval-name {
  color: #000000;
}

#running-screen.paused .next-interval-name,
#running-screen.paused .progress-info {
  color: #000000;
}

#running-screen.paused .btn-icon {
  color: #000000;
}

#running-screen.resting {
  background-color: #1a1a2e;
}

#running-screen.resting .countdown-display {
  color: #ffffff;
}

#running-screen.resting .current-interval-name {
  color: var(--primary);
}

#running-screen.resting .next-interval-name,
#running-screen.resting .progress-info {
  color: var(--text-secondary);
}

#running-screen.resting .btn-icon {
  color: var(--text);
}

.running-main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2px;
  padding-top: 36px;
  text-align: center;
  overflow: hidden;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  width: calc(100vw - 4px);
  padding: 0 2px;
  font-size: min(6vh, 8vw);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.current-interval-name {
  font-family: 'Bebas Neue', sans-serif;
  font-size: min(15vh, 28vw);
  font-weight: 400;
  color: var(--accent);
  margin-bottom: 0;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  line-height: 1.1;
  width: calc(100vw - 4px);
  max-width: calc(100vw - 4px);
  padding: 0 2px;
  text-align: center;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.next-interval-name {
  font-size: min(5vh, 7vw);
  color: var(--text-secondary);
  margin-bottom: 4px;
  min-height: 1.1em;
  width: calc(100vw - 4px);
  padding: 0 2px;
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.countdown-display {
  font-family: 'Bebas Neue', 'Hiragino Kaku Gothic Pro', 'Yu Gothic', sans-serif;
  font-size: min(30vh, 58vw);
  font-weight: 400;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  margin-bottom: 4px;
  transition: color var(--transition);
  letter-spacing: -0.03em;
  width: calc(100vw - 4px);
  max-width: calc(100vw - 4px);
  overflow: hidden;
  padding: 0 2px;
  text-align: center;
}

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

.countdown-display.rest {
  color: var(--success);
}

.countdown-display.pre-countdown {
  color: var(--accent);
}

.timer-controls {
  width: 100%;
  max-width: 400px;
  display: flex;
  flex-direction: row;
  gap: 12px;
  padding: 0 16px;
}

.timer-controls .btn {
  flex: 1;
  padding: 12px 16px;
  font-size: 1rem;
}

/* Context Menu */
.context-menu {
  position: fixed;
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  z-index: 1000;
}

.context-menu.hidden {
  display: none;
}

.context-action {
  display: block;
  width: 100%;
  padding: 16px 24px;
  font-size: 1rem;
  font-family: inherit;
  text-align: left;
  background: transparent;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  transition: background var(--transition);
}

.context-action:hover, .context-action:active {
  background: var(--bg-tertiary);
}

.context-action.danger {
  color: var(--danger);
}

/* Overlay for context menu */
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 999;
}

/* Responsive Adjustments */
@media (min-width: 768px) {
  main {
    max-width: 600px;
    margin: 0 auto;
  }
}

#running-screen main {
  max-width: none;
}

/* Landscape mode - use height-based sizing */
@media (orientation: landscape) {
  .countdown-display {
    font-size: min(45vh, 58vw);
  }

  .current-interval-name {
    font-size: min(18vh, 28vw);
  }

  .progress-info {
    font-size: min(8vh, 6vw);
  }

  .next-interval-name {
    font-size: min(8vh, 8vw);
  }
}

/* Safe Area for notched devices */
@supports (padding-top: env(safe-area-inset-top)) {
  header {
    padding-top: calc(16px + env(safe-area-inset-top));
  }

  footer {
    padding-bottom: calc(16px + env(safe-area-inset-bottom));
  }
}

/* Animation for countdown warning */
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.countdown-display.warning {
  animation: pulse 0.5s ease-in-out;
}