/* ---------------------------------------------------------
   Tokens
--------------------------------------------------------- */

:root {
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;

  --radius-sm: 8px;
  --radius-lg: 16px;

  --shadow-card: 0px 4px 25px 0px rgba(0, 0, 0, 0.1);

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 150ms var(--ease-out-expo);
  --transition-theme: 200ms var(--ease-out-expo);
}

[data-theme='light'] {
  --color-bg: #f7f9fc;
  --color-card-bg: #ffffff;
  --color-heading: #242456;
  --color-body: #4e4e69;
  --color-label-muted: #8181b8;
  --color-accent: #5e61f6;
  --color-accent-hover: #4a4de0;
  --color-accent-active: #3f42c9;
  --color-accent-contrast: #ffffff;
  --color-input-bg: #f7f9fc;
  --color-input-bg-hover: #eef1fa;
  --color-input-border: #d9dcf5;
  --color-input-border-focus: #5e61f6;
  --color-divider: #e2e5f5;
  --color-footer-muted: #455364;
  --color-icon-toggle: #242456;
  --color-btn-outline-border: #c7cdff;
  --color-btn-outline-text: #2d2f80;
  --shadow-btn: 0px 6px 16px 0px rgba(94, 97, 246, 0.25);
}

[data-theme='dark'] {
  --color-bg: #09182a;
  --color-card-bg: #10253e;
  --color-heading: #ffffff;
  --color-body: #c2daf4;
  --color-label-muted: #7ea2c9;
  --color-accent: #5ca8ff;
  --color-accent-hover: #7cb9ff;
  --color-accent-active: #4a95ea;
  --color-accent-contrast: #0f253e;
  --color-input-bg: #09182a;
  --color-input-bg-hover: #0d2136;
  --color-input-border: #18395b;
  --color-input-border-focus: #5ca8ff;
  --color-divider: #18395b;
  --color-footer-muted: #7ea2c9;
  --color-icon-toggle: #7ea2c9;
  --color-btn-outline-border: #2c527e;
  --color-btn-outline-text: #5ca8ff;
  --shadow-btn: 0px 6px 16px 0px rgba(9, 24, 42, 0.5);
}

/* ---------------------------------------------------------
   Reset + base
--------------------------------------------------------- */

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

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-body);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition-theme), color var(--transition-theme);
}

h1, h2, p {
  margin: 0;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.light-only, .dark-only {
  display: none;
}
[data-theme='light'] .light-only { display: block; }
[data-theme='dark'] .dark-only { display: block; }
button .light-only, button .dark-only,
svg.icon-sun, svg.icon-moon { display: none; }
[data-theme='light'] svg.icon-sun { display: block; }

[data-theme='dark'] svg.icon-moon { display: block; }

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* ---------------------------------------------------------
   Background decoration
--------------------------------------------------------- */

.bg-decor {
  position: fixed;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.mountain-1,
.mountain-foreground {
  position: absolute;
  left: 50%;
  width: 1440px;
  max-width: none;
  transform: translateX(-50%);
}

.mountain-1 {
  top: 211px;
}

.mountain-foreground {
  top: 348px;
}

.airplane {
  position: absolute;
  top: 267px;
  left: 0;
  width: 90px;
  animation: airplane-fly 32s linear infinite;
}

@keyframes airplane-fly {
  0% {
    transform: translateX(-150px);
    opacity: 0;
  }
  7% {
    opacity: 1;
  }
  78% {
    opacity: 1;
  }
  85% {
    transform: translateX(calc(100vw + 150px));
    opacity: 0;
  }
  100% {
    transform: translateX(calc(100vw + 150px));
    opacity: 0;
  }
}

@media (max-width: 640px) {
  .mountain { display: none !important; }

  .airplane {
    top: 10px;
    width: 64px;
  }
}

/* ---------------------------------------------------------
   Page layout
--------------------------------------------------------- */

.page {
  position: relative;
  z-index: 1;
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 3rem;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  margin-bottom: 1.75rem;
  padding-left: 2rem;
  padding-right: 2rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-icon {
  width: 27px;
  height: 27px;
  color: var(--color-accent);
  flex-shrink: 0;
}

.brand h1 {
  font-size: 2rem;
  font-weight: 600;
  color: var(--color-heading);
  letter-spacing: -0.01em;
}

.tagline {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-heading);
}

/* ---------------------------------------------------------
   Card
--------------------------------------------------------- */

.card {
  background: var(--color-card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  display: flex;
  transition: background-color var(--transition-theme);
}

.card-col--form {
  flex: 1 1 60%;
  min-width: 0;
  padding: 2rem 2rem;
  border-right: 1px solid var(--color-divider);
}

.card-col--result {
  flex: 1 1 40%;
  min-width: 0;
  padding: 2.25rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.field-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.5rem;
}

.field-row label {
  font-size: 1.125rem;
  color: var(--color-body);
  line-height: 1.35;
}

.field-row--time {
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--color-divider);
  margin-bottom: 1.75rem;
  padding-top: 0;
}

.field-group-label {
  font-size: 1rem;
  color: var(--color-body);
  margin-bottom: 1rem;
}

.field-group-label strong {
  font-weight: 600;
}

.duration-list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.duration-list .field-row {
  gap: 1.5rem;
}

.row-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.row-label {
  font-family: inherit;
  font-size: 1.125rem;
  line-height: 1.35;
  color: var(--color-body);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.5rem;
  margin-left: -0.5rem;
  flex: 1 1 auto;
  min-width: 0;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.row-label:hover {
  background: var(--color-input-bg-hover);
}

.row-label:focus {
  outline: none;
  background: var(--color-input-bg);
  border-color: var(--color-input-border-focus);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-input-border-focus) 20%, transparent);
}

.row-remove {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--color-label-muted);
  border-radius: 999px;
  cursor: pointer;
  flex-shrink: 0;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.row-remove svg {
  width: 14px;
  height: 14px;
}

.row-remove:hover {
  background: color-mix(in srgb, var(--color-label-muted) 15%, transparent);
  color: var(--color-body);
}

.btn-add-row {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.9rem;
  padding: 0.6rem 1.25rem 0.6rem 1rem;
  border: 1px solid var(--color-btn-outline-border);
  border-radius: var(--radius-sm);
  background: var(--color-card-bg);
  color: var(--color-btn-outline-text);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.btn-add-row svg {
  width: 14px;
  height: 14px;
}

.btn-add-row:hover {
  background: color-mix(in srgb, var(--color-btn-outline-text) 8%, transparent);
  border-color: var(--color-btn-outline-text);
}

/* Inputs */

input[type='number'] {
  font-family: inherit;
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-heading);
  background: var(--color-input-bg);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.85rem;
  min-width: 5.5rem;
  text-align: center;
  flex-shrink: 0;
  -moz-appearance: textfield;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

input[type='number']::-webkit-outer-spin-button,
input[type='number']::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input[type='number']:hover {
  background: var(--color-input-bg-hover);
}

input[type='number']:focus {
  outline: none;
  border-color: var(--color-input-border-focus);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-input-border-focus) 20%, transparent);
}

/* Time picker */

.time-field {
  position: relative;
  display: inline-flex;
  flex-shrink: 0;
}

.time-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: inherit;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-heading);
  background: var(--color-input-bg);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.85rem;
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.time-trigger:hover {
  background: var(--color-input-bg-hover);
}

.time-trigger[aria-expanded='true'] {
  outline: none;
  border-color: var(--color-input-border-focus);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-input-border-focus) 20%, transparent);
}

#timeTriggerText .meridiem-inline {
  font-size: 0.72em;
  font-weight: 600;
  text-transform: uppercase;
  margin-left: 0.1em;
}

.time-field-icon {
  width: 18px;
  height: 18px;
  color: var(--color-accent);
  flex-shrink: 0;
  pointer-events: none;
}

.time-dropdown {
  position: absolute;
  top: calc(100% + 0.6rem);
  right: 0;
  z-index: 20;
  display: none;
  width: 171px;
  height: 246px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-input-border);
  border-radius: 12px;
  box-shadow: 0px 4px 7px 0px rgba(78, 78, 105, 0.3);
  overflow: hidden;
}

.time-dropdown.is-open {
  display: flex;
}

.time-col {
  flex: 1 1 0;
  min-width: 0;
  height: 100%;
  overflow-y: auto;
  padding: 0.5rem 0.25rem;
  scrollbar-width: thin;
}

.time-col::-webkit-scrollbar {
  width: 4px;
}

.time-col::-webkit-scrollbar-thumb {
  background: var(--color-input-border);
  border-radius: 4px;
}

.time-option {
  display: block;
  width: 100%;
  padding: 0.5rem 0;
  border: none;
  background: none;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-body);
  text-align: center;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.time-option:hover {
  background: var(--color-input-bg-hover);
}

.time-option.is-selected {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--color-accent);
  color: var(--color-accent-contrast);
}

.time-option.is-selected:hover {
  background: var(--color-accent);
}

/* Result column */

.result-label {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-label-muted);
  margin-bottom: 0.25rem;
}

.result-time {
  font-size: 2rem;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 1.25rem;
  font-variant-numeric: tabular-nums;
}

.result-time .meridiem {
  font-size: 1.125rem;
  text-transform: uppercase;
  margin-left: 0.15em;
}

.btn-calendar {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-accent-contrast);
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem 0.75rem 1.25rem;
  cursor: pointer;
  box-shadow: var(--shadow-btn);
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-calendar svg {
  width: 16px;
  height: 16px;
}

.btn-calendar:hover {
  background: var(--color-accent-hover);
  text-decoration: none;
}

.btn-calendar:active {
  background: var(--color-accent-active);
  box-shadow: none;
}

.btn-calendar[aria-disabled='true'] {
  opacity: 0.6;
  cursor: default;
  pointer-events: none;
  transform: none;
}

.illustration {
  position: relative;
  width: 100%;
  max-width: 200px;
  margin-top: auto;
  padding-top: 32%;
}

.illustration .suitcase {
  width: 100%;
  right: -20px;
  position: relative;
}

.illustration .bubble {
  position: absolute;
  width: 35%;
  top: 14.5%;
  left: -12%;
  animation: bubble-in 550ms var(--ease-out-expo) both;
  animation-delay: 300ms;
}

@keyframes bubble-in {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------------------------------------------------------
   Footer
--------------------------------------------------------- */

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  margin-top: 1.5rem;
  font-size: 0.875rem;
}

.credit {
  color: var(--color-footer-muted);
}

.credit a {
  font-weight: 600;
}

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

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--color-icon-toggle);
  border-radius: 999px;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

.theme-toggle:hover {
  background: color-mix(in srgb, var(--color-icon-toggle) 12%, transparent);
}

/* ---------------------------------------------------------
   Responsive
--------------------------------------------------------- */

@media (max-width: 780px) {
  .card {
    flex-direction: column;
  }

  .card-col--form {
    border-right: none;
    border-bottom: 1px solid var(--color-divider);
    padding: 1.75rem 1.5rem;
  }

  .card-col--result {
    padding: 1.75rem 1.5rem 2rem;
  }
}

@media (max-width: 560px) {
  .page {
    padding: 1rem 1rem 2.5rem;
  }

  .site-header {
    margin-bottom: 1.25rem;
    flex-wrap: nowrap;
    padding-left: 0;
    padding-right: 0;
  }

  .brand h1 {
    font-size: 1.5rem;
  }

  .tagline {
    font-size: 1rem;
  }

  .field-row--time {
    flex-direction: column;
    align-items: stretch;
    gap: 0.4rem;
    border-bottom: none;
    padding-bottom: 0;
  }

  .time-field {
    width: 100%;
    margin: 12px auto;
  }

  .time-trigger {
    width: 100%;
    justify-content: space-between;
  }

  .duration-list .field-row {
    gap: 0.75rem;
  }

  .duration-list {
    gap: 0.3rem;
  }

  .btn-add-row {
    width: 100%;
    justify-content: center;
  }

  .result-time {
    font-size: 1.75rem;
  }

  .btn-calendar {
    width: 100%;
    justify-content: center;
  }

  .footer-meta {
    justify-content: space-between;
  }
}