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

:root {
  /* Light theme */
  --bg-primary: #ffffff;
  --bg-secondary: #f5f7fa;
  --text-primary: #1a202c;
  --text-secondary: #4a5568;
  --accent-primary: #3182ce;
  --accent-secondary: #63b3ed;
  --border-color: #e2e8f0;
  --success-color: #48bb78;
  --danger-color: #e53e3e;
  --shadow-color: rgba(0, 0, 0, 0.1);

  /* Sizes */
  --header-height: 64px;
  --footer-height: 48px;
  --border-radius: 8px;
  --transition-speed: 0.3s;

  /* Fonts */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

/* Dark Theme */
[data-theme="dark"] {
  --bg-primary: #1a202c;
  --bg-secondary: #2d3748;
  --text-primary: #f7fafc;
  --text-secondary: #cbd5e0;
  --accent-primary: #63b3ed;
  --accent-secondary: #3182ce;
  --border-color: #4a5568;
  --shadow-color: rgba(0, 0, 0, 0.3);
}

body {
  font-family: var(--font-primary);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.5;
  transition: background-color var(--transition-speed), color var(--transition-speed);
  min-height: 100vh;
}

/* Layout */
.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  padding: 2rem 1rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  margin-bottom: 1rem;
  font-weight: 600;
}

h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

/* Header */
header {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  box-shadow: 0 2px 4px var(--shadow-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo .material-icons {
  font-size: 1.8rem;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 1rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  transition: background-color var(--transition-speed), color var(--transition-speed);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-link .material-icons {
  font-size: 1.25rem;
}

.nav-link:hover {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}

.nav-link.active {
  color: var(--accent-primary);
  font-weight: 500;
}

.nav-link.active .material-icons {
  color: var(--accent-primary);
}

.theme-toggle {
  cursor: pointer;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-speed);
  width: 40px;
  height: 40px;
  border-radius: 50%;
}

.theme-toggle:hover {
  color: var(--accent-primary);
  background-color: var(--bg-secondary);
}

/* Footer */
footer {
  height: var(--footer-height);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  padding: 0 2rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Views */
.view {
  display: none;
  animation: fadeIn 0.3s ease-in-out;
}

.view.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Button Styles */
.btn {
  padding: 0.5rem 1.25rem;
  border-radius: var(--border-radius);
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition-speed);
  border: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 80px;
}

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

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

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

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

.btn-danger {
  background-color: var(--danger-color);
  color: white;
}

.btn-danger:hover {
  opacity: 0.9;
}

/* Form Elements */
input, select {
  padding: 0.5rem;
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-primary);
  transition: all var(--transition-speed);
}

input:focus, select:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 2px var(--accent-secondary);
}

label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
  display: block;
}

/* Clock Styles */
.clock-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  margin-bottom: 2rem;
}

@media (min-width: 768px) {
  .clock-container {
    flex-direction: row;
    justify-content: center;
    align-items: center;
  }
}

.analog-clock {
  width: 300px;
  height: 300px;
  position: relative;
}

.clock-face {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: var(--bg-secondary);
  position: relative;
  box-shadow: 0 4px 12px var(--shadow-color);
  transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
}

.marking {
  position: absolute;
  width: 4px;
  height: 16px;
  background-color: var(--text-primary);
  left: 50%;
  transform: translateX(-50%);
}

.marking-12 {
  top: 12px;
}

.marking-3 {
  top: 50%;
  left: calc(100% - 12px);
  transform: translateY(-50%) rotate(90deg);
}

.marking-6 {
  bottom: 12px;
  transform: translateX(-50%) rotate(180deg);
}

.marking-9 {
  top: 50%;
  left: 12px;
  transform: translateY(-50%) rotate(270deg);
}

.hour-hand, .minute-hand, .second-hand {
  position: absolute;
  bottom: 50%;
  left: 50%;
  transform-origin: bottom center;
  background-color: var(--text-primary);
  border-radius: 4px;
}

.hour-hand {
  width: 8px;
  height: 25%;
  transform: translateX(-50%) rotate(0deg);
  z-index: 10;
}

.minute-hand {
  width: 6px;
  height: 35%;
  transform: translateX(-50%) rotate(0deg);
  z-index: 20;
}

.second-hand {
  width: 2px;
  height: 40%;
  transform: translateX(-50%) rotate(0deg);
  background-color: var(--accent-primary);
  z-index: 30;
  transition: none;
}

.center-dot {
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--accent-primary);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 40;
}

.digital-time {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.time {
  font-size: 4rem;
  font-weight: 600;
  letter-spacing: -2px;
  font-variant-numeric: tabular-nums;
}

.date {
  font-size: 1.25rem;
  color: var(--text-secondary);
}

.time-zone {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.clock-settings {
  display: flex;
  gap: 2rem;
  justify-content: center;
  margin-top: 1rem;
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* Alarm Styles */
.alarm-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  margin-bottom: 2rem;
}

.current-time {
  font-size: 3rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.alarm-display {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.alarm-display input[type="time"] {
  font-size: 1.5rem;
  padding: 0.5rem 1rem;
  width: 180px;
}

.active-alarm {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem;
  border-radius: var(--border-radius);
  background-color: var(--bg-secondary);
  box-shadow: 0 4px 12px var(--shadow-color);
  animation: pulse 1.5s infinite;
}

.active-alarm .alarm-time {
  font-size: 2rem;
  font-weight: 600;
}

.hidden {
  display: none;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(49, 130, 206, 0.4);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(49, 130, 206, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(49, 130, 206, 0);
  }
}

.preset-alarms, .preset-timers {
  margin-top: 2rem;
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.preset-btn {
  padding: 0.75rem;
  border-radius: var(--border-radius);
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all var(--transition-speed);
  font-weight: 500;
}

.preset-btn:hover {
  background-color: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

.alarm-list {
  margin-top: 2rem;
  width: 100%;
  max-width: 600px;
}

.alarm-items {
  margin-top: 0.5rem;
}

.alarm-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  border-radius: var(--border-radius);
  background-color: var(--bg-secondary);
  margin-bottom: 0.5rem;
  transition: background-color var(--transition-speed);
}

.alarm-item:hover {
  background-color: var(--border-color);
}

/* Timer Styles */
.timer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  margin-bottom: 2rem;
}

.timer-display {
  font-size: 4rem;
  font-weight: 600;
  letter-spacing: -2px;
  font-variant-numeric: tabular-nums;
}

.timer-controls {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: center;
}

.timer-input {
  display: flex;
  gap: 1rem;
}

.time-unit {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.time-unit input {
  width: 80px;
  text-align: center;
  font-size: 1.5rem;
  padding: 0.5rem;
  font-variant-numeric: tabular-nums;
}

.timer-actions {
  display: flex;
  gap: 1rem;
}

/* Stopwatch Styles */
.stopwatch-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  margin-bottom: 2rem;
}

.stopwatch-display {
  font-size: 4rem;
  font-weight: 600;
  letter-spacing: -2px;
  font-variant-numeric: tabular-nums;
}

.stopwatch-controls {
  display: flex;
  gap: 1rem;
}

.lap-container {
  margin-top: 2rem;
  width: 100%;
  max-width: 600px;
}

.lap-list {
  margin-top: 0.5rem;
  max-height: 300px;
  overflow-y: auto;
}

.lap-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  border-radius: var(--border-radius);
  background-color: var(--bg-secondary);
  margin-bottom: 0.5rem;
  transition: background-color var(--transition-speed);
}

.lap-item:hover {
  background-color: var(--border-color);
}

/* Alert Modal */
.alert-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-speed);
}

.alert-modal.active {
  opacity: 1;
  pointer-events: auto;
}

.alert-content {
  background-color: var(--bg-primary);
  padding: 2rem;
  border-radius: var(--border-radius);
  max-width: 400px;
  width: 90%;
  text-align: center;
  box-shadow: 0 8px 24px var(--shadow-color);
  transform: translateY(20px);
  transition: transform var(--transition-speed);
}

.alert-modal.active .alert-content {
  transform: translateY(0);
}

#alert-title {
  margin-bottom: 0.5rem;
  color: var(--accent-primary);
}

#alert-message {
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

/* Section Headers */
.section-header, .subsection-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.section-header {
  margin-bottom: 2rem;
}

.subsection-header {
  margin-bottom: 1rem;
  margin-top: 2rem;
}

.section-icon {
  color: var(--accent-primary);
  font-size: 2rem;
}

.subsection-header .material-icons {
  color: var(--accent-primary);
  font-size: 1.5rem;
}

.section-header h2 {
  margin-bottom: 0;
  font-size: 1.75rem;
}

.subsection-header h3 {
  margin-bottom: 0;
}

/* Holidays Styles */
.holidays-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 1rem;
}

.holidays-description {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  text-align: center;
}

.featured-holiday {
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 12px var(--shadow-color);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.featured-holiday::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(to right, var(--accent-primary), var(--accent-secondary));
}

.countdown-display {
  margin-top: 1.5rem;
}

.countdown-time {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -1px;
  color: var(--accent-primary);
  font-variant-numeric: tabular-nums;
}

.countdown-date {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

.holiday-list {
  margin-bottom: 2rem;
}

.holiday-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.holiday-item {
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
  border: 1px solid var(--border-color);
}

.holiday-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 16px var(--shadow-color);
}

.holiday-name {
  font-weight: 600;
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.holiday-date {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.holiday-countdown {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent-primary);
  margin-top: auto;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border-color);
}

.custom-holiday {
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius);
  padding: 1.5rem;
}

.custom-holiday-form {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 1rem;
  align-items: end;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group input {
  height: 40px;
}

@media (max-width: 768px) {
  header {
    padding: 0 1rem;
  }

  .nav-links {
    gap: 0.25rem;
  }
  
  .nav-link {
    padding: 0.5rem;
  }
  
  .nav-text {
    display: none;
  }
  
  .nav-link .material-icons {
    font-size: 1.5rem;
  }

  .timer-input {
    flex-direction: column;
    gap: 0.5rem;
  }

  .clock-settings {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }
}