/* ==========================================================================
   FZClock Global Theme & Layout Variables
   ========================================================================== */
:root {
  --bg-color: #0b0f17;
  --header-bg: #111723;
  --card-bg: #161e2e;
  --led-screen-bg: #090d14;
  --text-primary: #ffffff;
  --text-secondary: #94a3b8;
  --accent-blue: #2563eb;
  --accent-blue-hover: #1d4ed8;
  --accent-glow: rgba(37, 99, 235, 0.35);
  --accent-color: #60a5fa;
  --accent-hover: #3b82f6;
  --danger-red: #dc2626;
  --border-color: #232e42;
  --font-scale: 100%;
}

body.light-mode {
  --bg-color: #f8fafc;
  --header-bg: #ffffff;
  --card-bg: #ffffff;
  --led-screen-bg: #0f172a;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --accent-blue: #2563eb;
  --accent-blue-hover: #1d4ed8;
  --accent-glow: rgba(37, 99, 235, 0.2);
  --accent-color: #2563eb;
  --accent-hover: #1d4ed8;
  --border-color: #e2e8f0;
}

html {
  font-size: var(--font-scale);
  box-sizing: border-box;
}

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

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: background-color 0.2s, color 0.2s;
}

/* ==========================================================================
   Header & Desktop Navigation
   ========================================================================== */
header {
  background-color: var(--header-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  position: relative;
  z-index: 100;
}

.logo a {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.site-logo {
  height: 22px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  transition: height 0.25s ease;
}

nav#nav-menu {
  display: flex;
  gap: 0.35rem;
  overflow-x: auto;
  white-space: nowrap;
}

nav a {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0.5rem 0.9rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.nav-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

nav a:hover {
  color: var(--text-primary);
  background-color: rgba(255, 255, 255, 0.05);
}

nav a.active {
  color: #ffffff;
  background-color: var(--accent-blue);
  box-shadow: 0 2px 10px var(--accent-glow);
}

.controls {
  display: flex;
  gap: 0.4rem;
  align-items: center;
}

.controls button {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.45rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
  transition: all 0.15s ease;
}

.controls button:hover {
  border-color: var(--accent-blue);
  background-color: var(--border-color);
}

/* Hamburger Button (Desktop Hidden) */
#hamburger-btn {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 24px;
  padding: 0;
}

#hamburger-btn span {
  display: block;
  height: 3px;
  width: 100%;
  background-color: var(--text-primary);
  border-radius: 3px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

#hamburger-btn.open span:nth-child(1),
#hamburger-btn.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

#hamburger-btn.open span:nth-child(2),
#hamburger-btn.active span:nth-child(2) {
  opacity: 0;
}

#hamburger-btn.open span:nth-child(3),
#hamburger-btn.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ==========================================================================
   Main Layout & Hero Display Box
   ========================================================================== */
main {
  flex: 1;
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.ad-banner {
  background-color: var(--card-bg);
  border: 1px dashed var(--border-color);
  border-radius: 10px;
  text-align: center;
  padding: 1rem;
  color: var(--text-secondary);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

.vclock-hero {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2.5rem 1.5rem;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.led-box {
  background-color: var(--led-screen-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem 0.5rem;
  margin: 0 auto 2rem auto;
  max-width: 700px;
  box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.8);
  box-sizing: border-box;
  overflow-x: hidden;
}

.clock-display {
  font-family: 'Share Tech Mono', 'Courier New', monospace;
  font-size: clamp(2.1rem, 11vw, 5rem);
  font-weight: 400;
  letter-spacing: 2px;
  color: #60a5fa;
  text-shadow: 0 0 15px rgba(96, 165, 250, 0.6), 0 0 30px rgba(37, 99, 235, 0.3);
  margin: 0;
  line-height: 1;
  white-space: nowrap;
}

/* ==========================================================================
   Buttons & Controls
   ========================================================================== */
.btn-primary {
  background-color: var(--accent-blue);
  color: #ffffff;
  border: none;
  padding: 0.9rem 2.75rem;
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-primary:hover {
  background-color: var(--accent-blue-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

.btn-danger {
  background-color: var(--danger-red);
  color: #ffffff;
  border: none;
  padding: 0.9rem 2.75rem;
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: 10px;
  cursor: pointer;
}

/* ==========================================================================
   Color Swatch Selector (Light & Dark Theme Visibility)
   ========================================================================== */
.color-swatch-btn {
  border: 2px solid rgba(255, 255, 255, 0.2) !important;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.color-swatch-btn[data-color="white"] {
  border: 2px solid #94a3b8 !important;
}

body.light-mode .color-swatch-btn {
  border: 2px solid rgba(0, 0, 0, 0.15) !important;
}

.color-swatch-btn.active {
  transform: scale(1.15);
  box-shadow: 0 0 0 2px var(--bg-color), 0 0 0 4px var(--accent-color);
}

body.light-mode .color-swatch-btn[data-color="white"].active {
  box-shadow: 0 0 0 2px var(--bg-color), 0 0 0 4px #475569;
}

/* ==========================================================================
   Presets & Recently Used
   ========================================================================== */
.preset-section {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.preset-section h3 {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-weight: 600;
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 0.75rem;
  max-width: 700px;
  margin: 0 auto;
}

.preset-btn {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.preset-btn:hover {
  border-color: var(--accent-blue);
  background-color: var(--card-bg);
  color: var(--accent-blue);
}

/* ==========================================================================
   Modal Dialogs & Overlays
   ========================================================================== */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  z-index: 999;
  justify-content: center;
  align-items: center;
  padding: 1rem;
}

.modal-overlay.active {
  display: flex;
}

.modal-box {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  width: 100%;
  max-width: 480px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  animation: modalSlide 0.25s ease-out;
}

@keyframes modalSlide {
  from { transform: translateY(-20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h2 {
  margin: 0;
  font-size: 1.3rem;
  color: var(--text-primary);
}

.modal-close-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.8rem;
  cursor: pointer;
  line-height: 1;
}

.modal-close-btn:hover {
  color: var(--text-primary);
}

.modal-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  text-align: left;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.form-row.time-selectors {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.modal-select, .modal-input {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.65rem 1rem;
  border-radius: 8px;
  font-size: 1rem;
  outline: none;
  width: 100%;
}

.modal-select:focus, .modal-input:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 8px var(--accent-glow);
}

.sound-input-group {
  display: flex;
  gap: 0.5rem;
}

.checkbox-group {
  flex-direction: row;
  align-items: center;
  gap: 0.6rem;
}

.checkbox-group input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent-blue);
  cursor: pointer;
}

.modal-footer {
  padding: 1.25rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

/* Social Share Grid */
.share-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 0.5rem;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.9rem;
  color: #ffffff;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.share-btn:hover {
  opacity: 0.9;
  transform: translateY(-2px);
}

.share-btn.wa { background-color: #25D366; }
.share-btn.fb { background-color: #1877F2; }
.share-btn.tw { background-color: #000000; border: 1px solid var(--border-color); }
.share-btn.pin { background-color: #E60023; }
.share-btn.li { background-color: #0A66C2; }
.share-btn.mail { background-color: #64748b; }

.copy-link-box {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

/* SEO Content Section */
.seo-content {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 2rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

.seo-content h2 {
  color: var(--text-primary);
  margin-top: 0;
}

footer {
  text-align: center;
  padding: 1.5rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   Unified Mobile Responsive Styles (2-Column Grid Navigation & Digit Scaling)
   ========================================================================== */
@media (max-width: 768px) {
  header {
    padding: 0.75rem 1rem;
    position: relative;
  }

  .site-logo {
    height: 18px;
  }

  #hamburger-btn {
    display: flex !important;
  }

  /* 2-Column Grid Mobile Dropdown (No Scrollbar Required) */
  nav#nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    grid-template-columns: repeat(2, 1fr);
    gap: 6px;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 0.5rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    z-index: 999;
    max-height: none !important;
    overflow: visible !important;
  }

  nav#nav-menu.active,
  nav#nav-menu.open {
    display: grid !important;
    opacity: 1;
  }

  nav#nav-menu a {
    padding: 0.5rem 0.65rem;
    font-size: clamp(0.8rem, 3.5vw, 0.9rem) !important;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    width: 100%;
    box-sizing: border-box;
    border-radius: 6px;
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  nav#nav-menu a .nav-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
  }

  nav#nav-menu a.active {
    background-color: rgba(96, 165, 250, 0.15);
    border-color: var(--accent-color);
  }

  /* Hero & Action Buttons Spacing */
  .vclock-hero {
    padding: 1.5rem 1rem;
  }

  .vclock-hero .btn-primary,
  .vclock-hero .btn-secondary,
  .vclock-hero .btn-danger {
    margin: 0.5rem 0.25rem;
    width: 100%;
    max-width: 280px;
  }

  .controls-action-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem !important;
  }

  /* Mobile Digit Overflow Capping */
  .clock-display {
    font-size: clamp(1.8rem, 8vw, 2.25rem) !important;
    letter-spacing: 0px !important;
    max-width: 100% !important;
    overflow: hidden !important;
  }

  .stopwatch-primary-digits {
    font-size: clamp(1.6rem, 7.5vw, 2.1rem) !important;
    letter-spacing: 0px !important;
  }

  .stopwatch-ms-digits {
    font-size: clamp(1.1rem, 5vw, 1.4rem) !important;
    letter-spacing: 0px !important;
  }

  .stopwatch-labels-row {
    gap: 0.75rem !important;
    font-size: 0.6rem !important;
  }

  .preset-grid,
  .share-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ==========================================================================
   Mobile Calendar Grid Font Scaling & Overflow Fix
   ========================================================================== */
@media (max-width: 768px) {
  /* Cap calendar day numbers inside cells */
  .calendar-day-cell {
    min-height: 42px !important;
    padding: 0.2rem !important;
    font-size: clamp(0.9rem, 4vw, 1.1rem) !important;
  }

  /* Cap calendar column headers (Sun, Mon, Tue...) */
  .calendar-day-header {
    font-size: clamp(0.65rem, 3vw, 0.75rem) !important;
    padding: 0.35rem 0.1rem !important;
    letter-spacing: 0px !important;
  }

  /* Reduce grid cell gap slightly on small screens */
  .calendar-grid {
    gap: 3px !important;
  }
}