/* ============================================
   Pomodoro Timer — Design System & Styles
   ============================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Color palette */
  --clr-bg-primary: #ffeee6;
  --clr-bg-secondary: #f1f5f9;
  --clr-bg-card: #ffffff;
  --clr-bg-card-hover: #ffffff;

  /* Work mode colors */
  --clr-work: #e63946;
  --clr-work-soft: rgba(230, 57, 70, 0.08);
  --clr-work-glow: rgba(230, 57, 70, 0.15);
  --clr-work-gradient-start: #ff4d5a;
  --clr-work-gradient-end: #ff7657;

  /* Break mode colors */
  --clr-break: #0ea5e9;
  --clr-break-soft: rgba(14, 165, 233, 0.08);
  --clr-break-glow: rgba(14, 165, 233, 0.15);
  --clr-break-gradient-start: #38bdf8;
  --clr-break-gradient-end: #0ea5e9;

  /* Active mode (set via JS) */
  --clr-accent: var(--clr-work);
  --clr-accent-soft: var(--clr-work-soft);
  --clr-accent-glow: var(--clr-work-glow);
  --clr-gradient-start: var(--clr-work-gradient-start);
  --clr-gradient-end: var(--clr-work-gradient-end);

  /* Text */
  --clr-text: #1e293b;
  --clr-text-muted: #64748b;
  --clr-text-dim: #94a3b8;

  /* Borders & misc */
  --clr-border: rgba(0, 0, 0, 0.04);
  --clr-glass-border: rgba(0, 0, 0, 0.03);
  --clr-success: #10b981;
  --clr-danger: #ef4444;

  /* Sizing */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 16px 40px -12px rgba(15, 23, 42, 0.08), 0 4px 16px -8px rgba(15, 23, 42, 0.02);
  --shadow-lg: 0 24px 60px -16px rgba(15, 23, 42, 0.15), 0 6px 20px -8px rgba(15, 23, 42, 0.03);
  --shadow-glow: 0 10px 24px -8px var(--clr-accent-glow);

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
}

/* Break mode overrides — toggled via .break-mode on <body> */
body.break-mode {
  --clr-accent: var(--clr-break);
  --clr-accent-soft: var(--clr-break-soft);
  --clr-accent-glow: var(--clr-break-glow);
  --clr-gradient-start: var(--clr-break-gradient-start);
  --clr-gradient-end: var(--clr-break-gradient-end);
  --clr-bg-primary: #f0f9ff;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--clr-bg-primary);
  color: var(--clr-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
  transition: background var(--transition-slow);
}

/* ---------- Main Container ---------- */
.container {
  width: 100%;
  max-width: 520px;
  padding: 32px 20px 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
}

/* ---------- Header / Title ---------- */
.app-header {
  text-align: center;
  margin-bottom: 4px;
}

.app-title {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--clr-text-muted);
}

.app-title span {
  color: var(--clr-accent);
  transition: color var(--transition-normal);
}

/* ---------- Card ---------- */
.glass-card {
  width: 100%;
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-glass-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-md);
  transition: background var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.glass-card:hover {
  background: var(--clr-bg-card-hover);
  box-shadow: var(--shadow-lg);
}

/* ---------- Mode Label ---------- */
.mode-label {
  text-align: center;
  margin-bottom: 8px;
}

.mode-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  background: var(--clr-accent-soft);
  color: var(--clr-accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: background var(--transition-normal), color var(--transition-normal);
}

.mode-badge .icon {
  font-size: 1rem;
}

/* ---------- Timer Ring ---------- */
.timer-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 12px 0 8px;
}

.timer-ring {
  position: relative;
  width: 280px;
  height: 280px;
}

.timer-ring svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.timer-ring .ring-bg {
  fill: none;
  stroke: rgba(15, 23, 42, 0.04);
  stroke-width: 6;
}

.timer-ring .ring-progress {
  fill: none;
  stroke: url(#gradient);
  stroke-width: 6;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.4s linear;
}

.timer-display {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.timer-time {
  font-family: var(--font-mono);
  font-size: 3.5rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--clr-text);
  line-height: 1;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
  transition: text-shadow var(--transition-normal);
}

.timer-session-count {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  margin-top: 6px;
  letter-spacing: 0.04em;
}

/* ---------- Overtime Label ---------- */
.overtime-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #e63946;
  background: rgba(230, 57, 70, 0.08);
  padding: 3px 12px;
  border-radius: var(--radius-full);
  margin-top: 4px;
  animation: overtime-pulse 1.5s ease-in-out infinite;
}

@keyframes overtime-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ---------- Controls ---------- */
.controls {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 4px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: none;
  border-radius: var(--radius-full);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  outline: none;
  letter-spacing: 0.02em;
}

.btn:active {
  transform: scale(0.95);
}

.btn-primary {
  padding: 12px 36px;
  background: linear-gradient(135deg, var(--clr-gradient-start), var(--clr-gradient-end));
  color: #fff;
  box-shadow: var(--shadow-glow), var(--shadow-sm);
  font-size: 0.95rem;
}

.btn-primary:hover {
  filter: brightness(1.05);
  box-shadow: 0 10px 24px -6px var(--clr-accent-glow), var(--shadow-md);
}

.btn-secondary {
  padding: 10px 22px;
  background: rgba(0, 0, 0, 0.025);
  color: var(--clr-text-muted);
  border: 1px solid rgba(0, 0, 0, 0.06);
}

.btn-secondary:hover {
  background: rgba(0, 0, 0, 0.05);
  color: var(--clr-text);
}

.btn-icon {
  width: 42px;
  height: 42px;
  padding: 0;
  border-radius: 50%;
  font-size: 1.1rem;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.78rem;
}

.btn-danger {
  padding: 6px 14px;
  font-size: 0.78rem;
  background: rgba(239, 68, 68, 0.06);
  color: var(--clr-danger);
  border: 1px solid rgba(239, 68, 68, 0.15);
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.12);
}

.btn-success {
  padding: 6px 14px;
  font-size: 0.78rem;
  background: rgba(16, 185, 129, 0.06);
  color: var(--clr-success);
  border: 1px solid rgba(16, 185, 129, 0.15);
}

.btn-success:hover {
  background: rgba(16, 185, 129, 0.12);
}

.btn-break {
  padding: 12px 36px;
  background: linear-gradient(135deg, #38bdf8, #0ea5e9);
  color: #fff;
  font-size: 0.95rem;
  box-shadow: 0 10px 24px -8px rgba(14, 165, 233, 0.3), var(--shadow-sm);
}

.btn-break:hover {
  filter: brightness(1.05);
  box-shadow: 0 10px 24px -6px rgba(14, 165, 233, 0.4), var(--shadow-md);
}

.btn-interrupt {
  padding: 10px 22px;
  background: rgba(245, 158, 11, 0.08);
  color: #d97706;
  border: 1px solid rgba(245, 158, 11, 0.2);
  font-size: 0.88rem;
}

.btn-interrupt:hover {
  background: rgba(245, 158, 11, 0.15);
  border-color: rgba(245, 158, 11, 0.35);
  box-shadow: 0 4px 12px -4px rgba(245, 158, 11, 0.2);
}

/* ---------- Settings Section ---------- */
.settings-card {
  padding: 22px 28px;
}

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

.btn-setting-reset {
  padding: 5px 12px;
  font-size: 0.72rem;
  background: rgba(0, 0, 0, 0.025);
  color: var(--clr-text-dim);
  border: 1px solid rgba(0, 0, 0, 0.06);
  transition: all var(--transition-fast);
}

.btn-setting-reset:hover {
  background: rgba(0, 0, 0, 0.06);
  color: var(--clr-text-muted);
  border-color: rgba(0, 0, 0, 0.1);
}

.btn-setting-reset.disabled {
  opacity: 0.35;
  pointer-events: none;
}

.section-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-title .icon {
  font-size: 0.95rem;
}

.settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.setting-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.setting-label {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.setting-input-group {
  display: flex;
  align-items: center;
  gap: 2px;
  background: rgba(0, 0, 0, 0.02);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.setting-input-group:focus-within {
  border-color: var(--clr-accent);
  background: rgba(255, 255, 255, 0.8);
}

.setting-input-group input {
  width: 100%;
  background: transparent;
  border: none;
  outline: none;
  color: var(--clr-text);
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  padding: 8px 10px;
  text-align: center;
}

.setting-input-group input::-webkit-inner-spin-button,
.setting-input-group input::-webkit-outer-spin-button {
  -webkit-appearance: none;
}

.setting-input-group input[type='number'] {
  -moz-appearance: textfield;
}

.setting-unit {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  padding-right: 10px;
  white-space: nowrap;
}

.setting-input-group.disabled {
  opacity: 0.4;
  pointer-events: none;
}

/* ---------- History Section ---------- */
.history-card {
  padding: 22px 28px;
}

.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.history-actions {
  display: flex;
  gap: 8px;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 320px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(0, 0, 0, 0.1) transparent;
}

.history-list::-webkit-scrollbar {
  width: 4px;
}

.history-list::-webkit-scrollbar-track {
  background: transparent;
}

.history-list::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.12);
  border-radius: 2px;
}

.history-empty {
  text-align: center;
  padding: 28px 0;
  color: var(--clr-text-dim);
  font-size: 0.85rem;
}

.history-empty .icon {
  display: block;
  font-size: 1.8rem;
  margin-bottom: 8px;
  opacity: 0.4;
}

/* History date group */
.history-date-group {
  margin-bottom: 8px;
}

.history-date-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  letter-spacing: 0.06em;
  padding: 6px 0 4px;
  border-bottom: 1px solid var(--clr-border);
  margin-bottom: 4px;
}

.history-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.015);
  transition: background var(--transition-fast);
  font-size: 0.82rem;
}

.history-item:hover {
  background: rgba(0, 0, 0, 0.035);
}

.history-item .mode-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.history-item .mode-dot.work {
  background: var(--clr-work);
  box-shadow: 0 0 6px rgba(255, 95, 95, 0.2);
}

.history-item .mode-dot.break {
  background: var(--clr-break);
  box-shadow: 0 0 6px rgba(14, 165, 233, 0.2);
}

.history-item .time-range {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--clr-text-muted);
}

.history-item .duration {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--clr-text);
}

.overtime-badge {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  font-weight: 600;
  color: #e63946;
  background: rgba(230, 57, 70, 0.08);
  padding: 1px 6px;
  border-radius: var(--radius-full);
  margin-left: 4px;
  letter-spacing: 0.02em;
}

.interrupted-badge {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  font-weight: 600;
  color: #d97706;
  background: rgba(245, 158, 11, 0.08);
  padding: 1px 6px;
  border-radius: var(--radius-full);
  margin-left: 4px;
  letter-spacing: 0.02em;
}

/* ---------- Confirm Modal ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

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

.modal-dialog {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  box-shadow: var(--shadow-lg);
  text-align: center;
  max-width: 320px;
  width: 90%;
  transform: scale(0.92);
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-overlay.show .modal-dialog {
  transform: scale(1);
}

.modal-message {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--clr-text);
  margin-bottom: 20px;
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.modal-actions .btn {
  padding: 8px 24px;
  font-size: 0.85rem;
}

/* ---------- Toast Notification ---------- */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: 12px 24px;
  border-radius: var(--radius-full);
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.06);
  color: var(--clr-text);
  font-size: 0.85rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(12px);
  z-index: 1000;
  opacity: 0;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
  pointer-events: none;
}

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

.toast.toast-success {
  border-color: rgba(16, 185, 129, 0.3);
}

/* ---------- Pulse animation for active timer ---------- */
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 0 0 var(--clr-accent-glow); }
  50% { box-shadow: 0 0 0 10px transparent; }
}

.timer-ring.active .ring-progress {
  filter: drop-shadow(0 2px 6px var(--clr-accent-glow));
}

/* ---------- Overtime visual state ---------- */
@keyframes overtime-ring-pulse {
  0%, 100% { filter: drop-shadow(0 2px 8px rgba(230, 57, 70, 0.25)); }
  50% { filter: drop-shadow(0 2px 16px rgba(230, 57, 70, 0.5)); }
}

.timer-ring.overtime .ring-progress {
  animation: overtime-ring-pulse 1.5s ease-in-out infinite;
}

.timer-ring.overtime .timer-time {
  color: #e63946;
}

/* ---------- Fade-in animation ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.glass-card {
  animation: fadeInUp 0.5s ease both;
}

.glass-card:nth-child(2) { animation-delay: 0.08s; }
.glass-card:nth-child(3) { animation-delay: 0.16s; }
.glass-card:nth-child(4) { animation-delay: 0.24s; }

/* ---------- Responsive ---------- */
@media (max-width: 480px) {
  .container {
    padding: 20px 14px 40px;
    gap: 20px;
  }

  .glass-card {
    padding: 20px;
    border-radius: var(--radius-md);
  }

  .timer-ring {
    width: 240px;
    height: 240px;
  }

  .timer-time {
    font-size: 2.8rem;
  }

  .settings-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .controls {
    gap: 8px;
  }

  .btn-primary {
    padding: 10px 28px;
    font-size: 0.88rem;
  }

  .history-card {
    padding: 18px 20px;
  }
}