/* ---------------------------------------------------------------------
   Vacay - styles.css
   Plain vanilla CSS (no framework). Uses Bootstrap's default color
   palette for familiar tab/button styling, with a medium-blue gradient
   theme for the app chrome.
--------------------------------------------------------------------- */

:root {
  /* Bootstrap-inspired default palette */
  --bs-blue: #0d6efd;
  --bs-blue-dark: #0b5ed7;
  --bs-blue-darker: #0a58ca;
  --bs-gray-100: #f8f9fa;
  --bs-gray-200: #e9ecef;
  --bs-gray-400: #ced4da;
  --bs-gray-600: #6c757d;
  --bs-gray-800: #343a40;
  --bs-success: #198754;
  --bs-success-dark: #146c43;
  --bs-white: #ffffff;

  /* App theme: medium blue gradient */
  --theme-gradient: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  --theme-color: #2563eb;

  --radius: 0.5rem;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bs-gray-100);
  color: var(--bs-gray-800);
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
.app-header {
  background: var(--theme-gradient);
  color: var(--bs-white);
  padding: 1rem 1.25rem;
  text-align: center;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.app-title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* Tabs (Bootstrap nav-tabs inspired) */
.tabs {
  display: flex;
  border-bottom: 1px solid var(--bs-gray-400);
  background-color: var(--bs-white);
  padding: 0 0.5rem;
}

.tab-btn {
  appearance: none;
  border: 1px solid transparent;
  border-top-left-radius: var(--radius);
  border-top-right-radius: var(--radius);
  background: transparent;
  color: var(--bs-blue);
  font-size: 1rem;
  font-weight: 500;
  padding: 0.75rem 1.25rem;
  margin: 0.25rem 0.15rem 0;
  cursor: pointer;
  transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out;
}

.tab-btn:hover {
  color: var(--bs-blue-darker);
  background-color: var(--bs-gray-200);
}

.tab-btn.active {
  color: var(--bs-gray-800);
  background-color: var(--bs-white);
  border-color: var(--bs-gray-400) var(--bs-gray-400) var(--bs-white);
}

.tab-btn:focus-visible {
  outline: 2px solid var(--bs-blue);
  outline-offset: 2px;
}

/* Main content */
.app-main {
  flex: 1;
  width: 100%;
  max-width: 40rem;
  margin: 0 auto;
  padding: 1rem;
}

.tab-panel {
  display: block;
}

.tab-panel[hidden] {
  display: none;
}

.loading-message {
  color: var(--bs-gray-600);
  text-align: center;
  margin-top: 2rem;
}

/* Countdown cards */
.countdown-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.countdown-card {
  background: var(--bs-white);
  border: 1px solid var(--bs-gray-200);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.countdown-label {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--bs-gray-800);
}

.countdown-datetime {
  font-size: 0.8rem;
  color: var(--bs-gray-600);
}

.countdown-timer {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--bs-blue);
  font-variant-numeric: tabular-nums;
}

/* Buttons (Bootstrap btn-primary / btn-success inspired) */
.btn {
  display: inline-block;
  font-weight: 400;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  user-select: none;
  border: 1px solid transparent;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  border-radius: var(--radius);
  transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out;
}

.btn-primary {
  color: var(--bs-white);
  background-color: var(--bs-blue);
  border-color: var(--bs-blue);
}

.btn-primary:hover {
  background-color: var(--bs-blue-dark);
  border-color: var(--bs-blue-darker);
}

.btn-success {
  color: var(--bs-white);
  background-color: var(--bs-success);
  border-color: var(--bs-success);
  align-self: flex-start;
}

.btn-success:hover {
  background-color: var(--bs-success-dark);
  border-color: var(--bs-success-dark);
}

.btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

/* Share tab */
.share-card {
  background: var(--bs-white);
  border: 1px solid var(--bs-gray-200);
  border-radius: var(--radius);
  padding: 2rem 1.25rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  text-align: center;
}

.share-label {
  margin: 0;
  font-weight: 600;
  color: var(--bs-gray-800);
}

.qrcode {
  display: inline-flex;
  padding: 0.75rem;
  background: var(--bs-white);
  border-radius: var(--radius);
}

.qrcode img,
.qrcode canvas,
.qrcode table {
  display: block;
  max-width: 100%;
  height: auto;
}

.share-url {
  margin: 0;
  color: var(--bs-blue);
  font-size: 0.95rem;
  word-break: break-all;
}

/* Responsive tweaks */
@media (min-width: 576px) {
  .app-title {
    font-size: 1.75rem;
  }

  .tab-btn {
    font-size: 1.05rem;
    padding: 0.85rem 1.5rem;
  }
}

@media (max-width: 400px) {
  .tab-btn {
    flex: 1;
    padding: 0.65rem 0.5rem;
    font-size: 0.9rem;
  }

  .app-main {
    padding: 0.75rem;
  }
}