/* ============================================================
   WHY CALENDAR - CSS STYLES
   ============================================================ */

/* ============================================================
   CSS VARIABLES
   ============================================================ */
:root {
  --bg-base: #050510;
  --grad-1: #667eea;
  --grad-2: #764ba2;
  --grad-3: #f093fb;
  --grad-4: #f5576c;
  --grad-5: #4facfe;
  --grad-6: #00f2fe;

  --glass-bg: rgba(255, 255, 255, 0.07);
  --glass-bg-hover: rgba(255, 255, 255, 0.12);
  --glass-bg-strong: rgba(255, 255, 255, 0.13);
  --glass-border: rgba(255, 255, 255, 0.13);
  --glass-border-hover: rgba(255, 255, 255, 0.28);
  --glass-blur: 22px;
  --glass-blur-heavy: 40px;
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  --glass-shadow-lg: 0 16px 64px rgba(0, 0, 0, 0.6);
  --glass-highlight: inset 1px 1px 0 rgba(255, 255, 255, 0.18);

  --text-primary: #f0f0ff;
  --text-secondary: rgba(240, 240, 255, 0.58);
  --text-muted: rgba(240, 240, 255, 0.35);
  --accent: #a78bfa;
  --accent-2: #f0abfc;

  --font-display: 'Barlow Condensed', 'D-DIN-PRO', 'Noto Sans SC', sans-serif;
  --font-body: 'Noto Sans SC', sans-serif;

  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --radius-xl: 40px;
  --radius-pill: 999px;

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-med: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.55s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

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

/* ============================================================
   ANIMATED BACKGROUND
   ============================================================ */
.bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  animation: float 20s ease-in-out infinite;
}

.blob-1 {
  width: 600px;
  height: 600px;
  background: linear-gradient(135deg, var(--grad-1), var(--grad-2));
  top: -200px;
  left: -200px;
  animation-delay: 0s;
}

.blob-2 {
  width: 500px;
  height: 500px;
  background: linear-gradient(135deg, var(--grad-3), var(--grad-4));
  top: 50%;
  right: -150px;
  animation-delay: -5s;
  animation-duration: 25s;
}

.blob-3 {
  width: 450px;
  height: 450px;
  background: linear-gradient(135deg, var(--grad-5), var(--grad-6));
  bottom: -150px;
  left: 30%;
  animation-delay: -10s;
  animation-duration: 22s;
}

.blob-4 {
  width: 350px;
  height: 350px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  top: 20%;
  right: 20%;
  animation-delay: -15s;
  animation-duration: 18s;
  opacity: 0.3;
}

@keyframes float {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  25% {
    transform: translate(50px, -30px) scale(1.05);
  }
  50% {
    transform: translate(-20px, 50px) scale(0.95);
  }
  75% {
    transform: translate(-40px, -20px) scale(1.02);
  }
}

/* ============================================================
   CONTAINER & LAYOUT
   ============================================================ */
.container {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 48px);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================================================
   HEADER
   ============================================================ */
.header {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: clamp(24px, 5vw, 48px) 0 clamp(16px, 3vw, 32px);
  text-align: center;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: clamp(8px, 1.5vw, 12px) clamp(14px, 2vw, 20px);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  font-size: clamp(12px, 1.5vw, 14px);
  transition: var(--transition-fast);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  position: absolute;
  left: clamp(16px, 4vw, 48px);
  top: clamp(20px, 4vw, 36px);
  opacity: 1;
  visibility: visible;
  transition:
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast),
    opacity var(--transition-med),
    visibility var(--transition-med);
}

.back-link:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  color: var(--text-primary);
  transform: translateX(-4px);
}

.spec-link {
  display: inline-flex;
  align-items: center;
  gap: clamp(10px, 1.5vw, 14px);
  padding: clamp(12px, 2.2vw, 18px) clamp(18px, 3vw, 26px);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  color: var(--accent);
  font-size: clamp(13px, 2vw, 16px);
  transition: 
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  margin-top: 16px;
  min-height: clamp(44px, 6vw, 56px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.20);
  position: relative;
  overflow: hidden;
  isolation: isolate;
  animation: spec-link-pulse 3.2s ease-in-out infinite;
  opacity: 1;
  visibility: visible;
  transition:
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    opacity var(--transition-med),
    visibility var(--transition-med);
}

.spec-link:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  color: var(--accent-2);
  transform: translateY(-2px);
  box-shadow: 0 18px 56px rgba(167, 139, 250, 0.22);
}

.spec-link::before {
  content: '';
  position: absolute;
  inset: -40%;
  background: radial-gradient(circle, rgba(167, 139, 250, 0.36) 0%, rgba(167, 139, 250, 0) 70%);
  filter: blur(14px);
  z-index: -1;
  animation: spec-link-glow 4.8s ease-in-out infinite;
}

.spec-link svg {
  width: clamp(18px, 2.4vw, 22px);
  height: clamp(18px, 2.4vw, 22px);
  flex-shrink: 0;
}

.spec-link-text {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  line-height: 1.05;
}

.spec-link-title {
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--text-primary);
  font-size: clamp(16px, 2.6vw, 20px);
  letter-spacing: 0.2px;
}

.spec-link-hint {
  margin-top: 3px;
  font-size: clamp(11px, 1.7vw, 13px);
  color: var(--text-muted);
}

.spec-link:hover .spec-link-hint {
  color: var(--accent);
}

.spec-link:focus-visible {
  outline: 3px solid rgba(167, 139, 250, 0.55);
  outline-offset: 4px;
}

@keyframes spec-link-pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.78;
  }
}

@keyframes spec-link-glow {
  0%, 100% {
    opacity: 0.4;
    transform: scale(0.95);
  }
  50% {
    opacity: 0.92;
    transform: scale(1.08);
  }
}

.logo {
  font-family: var(--font-display);
  font-size: clamp(32px, 6vw, 56px);
  font-weight: 800;
  background: linear-gradient(135deg, var(--grad-1), var(--grad-2), var(--grad-3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: clamp(4px, 1vw, 8px);
  letter-spacing: -1px;
}

.subtitle {
  font-size: clamp(11px, 1.5vw, 14px);
  color: var(--text-muted);
  letter-spacing: clamp(2px, 1vw, 4px);
  text-transform: uppercase;
}

/* ============================================================
   MAIN CONTENT
   ============================================================ */
.main-content {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(24px, 4vw, 60px);
  padding: clamp(16px, 3vw, 32px) 0 clamp(32px, 5vw, 60px);
  align-items: start;
  transition: gap var(--transition-med);
}

/* ============================================================
   CALENDAR SECTION (LEFT)
   ============================================================ */
.calendar-section {
  display: flex;
  justify-content: center;
}

.calendar-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur-heavy));
  -webkit-backdrop-filter: blur(var(--glass-blur-heavy));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: clamp(20px, 4vw, 40px);
  box-shadow: var(--glass-shadow-lg);
  width: 100%;
  max-width: 480px;
  transition: 
    border-color var(--transition-med),
    padding var(--transition-med),
    max-width var(--transition-med),
    height var(--transition-med);
}

.calendar-card:hover {
  border-color: var(--glass-border-hover);
}

/* Calendar Navigation */
.calendar-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: clamp(16px, 3vw, 28px);
  transition: margin-bottom var(--transition-med);
}

.nav-btn {
  width: clamp(36px, 6vw, 48px);
  height: clamp(36px, 6vw, 48px);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: 
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast),
    width var(--transition-med),
    height var(--transition-med);
}

.nav-btn:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  color: var(--text-primary);
  transform: scale(1.05);
}

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

.nav-btn img {
  width: clamp(18px, 3vw, 24px);
  height: clamp(18px, 3vw, 24px);
  transition: width var(--transition-med), height var(--transition-med);
}

.current-month {
  font-family: var(--font-display);
  font-size: clamp(18px, 3vw, 26px);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 1px;
  white-space: nowrap;
  transition: font-size var(--transition-med);
}

/* Year Navigation */
.year-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(10px, 2vw, 20px);
  margin-top: clamp(16px, 3vw, 28px);
  padding-top: clamp(14px, 3vw, 24px);
  border-top: 1px solid var(--glass-border);
  transition: 
    gap var(--transition-med),
    margin-top var(--transition-med),
    padding-top var(--transition-med);
}

.year-btn {
  width: clamp(28px, 5vw, 36px);
  height: clamp(28px, 5vw, 36px);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: 
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast),
    width var(--transition-med),
    height var(--transition-med);
}

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

.year-btn img {
  width: clamp(12px, 2vw, 16px);
  height: clamp(12px, 2vw, 16px);
  transition: width var(--transition-med), height var(--transition-med);
}

.current-year {
  font-family: var(--font-display);
  font-size: clamp(14px, 2.5vw, 20px);
  font-weight: 600;
  color: var(--text-secondary);
  min-width: clamp(60px, 10vw, 90px);
  text-align: center;
  transition: 
    font-size var(--transition-med),
    min-width var(--transition-med);
}

/* Today Button Wrapper - Fixed width container */
.today-btn-wrapper {
  width: clamp(60px, 10vw, 80px);
  display: flex;
  justify-content: flex-end;
  transition: width var(--transition-med);
}

.today-btn {
  padding: clamp(6px, 1vw, 10px) clamp(12px, 2vw, 20px);
  background: linear-gradient(135deg, var(--grad-1), var(--grad-2));
  border: none;
  border-radius: var(--radius-pill);
  color: white;
  font-size: clamp(11px, 1.5vw, 13px);
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: 
    opacity var(--transition-med),
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    padding var(--transition-med),
    font-size var(--transition-med);
}

.today-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
}

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

.today-btn.hidden {
  opacity: 0;
  pointer-events: none;
}

/* When Today button is hidden, collapse wrapper so year selector stays centered */
.today-btn-wrapper:has(.today-btn.hidden) {
  width: 0;
  min-width: 0;
  overflow: hidden;
  margin: 0;
}

/* Weekday Headers */
.weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: clamp(4px, 1vw, 8px);
  margin-bottom: clamp(8px, 2vw, 14px);
  transition: 
    gap var(--transition-med),
    margin-bottom var(--transition-med);
}

.weekday {
  text-align: center;
  font-size: clamp(10px, 1.5vw, 13px);
  font-weight: 600;
  color: var(--text-muted);
  padding: clamp(6px, 1vw, 10px) 4px;
  letter-spacing: 1px;
  transition: 
    font-size var(--transition-med),
    padding var(--transition-med);
}

.weekday:nth-child(7),
.weekday:nth-child(1) {
  color: var(--accent-2);
}

/* Days Grid */
.days-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: clamp(4px, 1vw, 8px);
  transition: gap var(--transition-med);
}

.day-cell {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(13px, 2vw, 16px);
  font-weight: 500;
  color: var(--text-primary);
  background: var(--glass-bg);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  position: relative;
  transition: 
    background var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    font-size var(--transition-med);
}

.day-cell:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border);
  transform: scale(1.1);
}

.day-cell.empty {
  background: transparent;
  pointer-events: none;
}

.day-cell.today {
  background: linear-gradient(135deg, var(--grad-1), var(--grad-2));
  color: white;
  font-weight: 700;
  box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
  transition: 
    background var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
}

.day-cell.today:hover {
  transform: scale(1.15);
  box-shadow: 0 6px 25px rgba(102, 126, 234, 0.5);
}

.day-cell.selected {
  background: var(--glass-bg-strong);
  border-color: var(--accent);
  box-shadow: 0 0 20px rgba(167, 139, 250, 0.3);
  transition: 
    background var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.day-cell:nth-child(7n+1) {
  color: var(--accent-2);
}

.day-cell:nth-child(7n) {
  color: var(--accent);
}

/* ============================================================
   DATETIME SECTION (RIGHT)
   ============================================================ */
.datetime-section {
  display: flex;
  justify-content: center;
}

.datetime-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur-heavy));
  -webkit-backdrop-filter: blur(var(--glass-blur-heavy));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: clamp(28px, 5vw, 56px) clamp(24px, 4vw, 48px);
  box-shadow: var(--glass-shadow-lg);
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: 
    border-color var(--transition-med),
    padding var(--transition-med),
    max-width var(--transition-med);
}

.datetime-card:hover {
  border-color: var(--glass-border-hover);
}

/* Date Display */
.date-display {
  margin-bottom: clamp(24px, 5vw, 48px);
  transition: margin-bottom var(--transition-med);
}

.date-day {
  font-family: var(--font-display);
  font-size: clamp(72px, 18vw, 140px);
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(135deg, var(--grad-1), var(--grad-3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
  filter: drop-shadow(0 4px 30px rgba(102, 126, 234, 0.3));
  transition: font-size var(--transition-med);
}

.date-weekday {
  font-size: clamp(18px, 3vw, 26px);
  font-weight: 600;
  color: var(--accent);
  margin-top: clamp(4px, 1vw, 10px);
  letter-spacing: clamp(3px, 1vw, 6px);
  text-transform: uppercase;
  transition: 
    font-size var(--transition-med),
    margin-top var(--transition-med),
    letter-spacing var(--transition-med);
}

.date-full {
  font-size: clamp(13px, 2vw, 17px);
  color: var(--text-secondary);
  margin-top: clamp(8px, 2vw, 14px);
  letter-spacing: 2px;
  transition: 
    font-size var(--transition-med),
    margin-top var(--transition-med);
}


/* Time Display */
.time-display {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: clamp(2px, 0.5vw, 6px);
  margin-bottom: clamp(16px, 3vw, 28px);
  transition: 
    gap var(--transition-med),
    margin-bottom var(--transition-med);
}

.time-hours,
.time-minutes {
  font-family: var(--font-display);
  font-size: clamp(42px, 12vw, 80px);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  min-width: 2ch;
  text-align: center;
  transition: font-size var(--transition-med);
}

.time-separator {
  font-family: var(--font-display);
  font-size: clamp(42px, 12vw, 80px);
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  animation: blink 1s ease-in-out infinite;
  transition: font-size var(--transition-med);
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.time-seconds-wrapper {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding-top: clamp(4px, 1vw, 10px);
  transition: padding-top var(--transition-med);
}

.time-seconds {
  font-family: var(--font-display);
  font-size: clamp(18px, 4vw, 32px);
  font-weight: 600;
  color: var(--accent-2);
  line-height: 1;
  transition: font-size var(--transition-med);
}

/* Digital Time */
.digital-time {
  font-family: var(--font-display), monospace;
  font-size: clamp(12px, 1.8vw, 15px);
  color: var(--text-muted);
  letter-spacing: clamp(2px, 0.5vw, 4px);
  padding: clamp(8px, 1.5vw, 12px) clamp(16px, 3vw, 28px);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  transition: 
    font-size var(--transition-med),
    letter-spacing var(--transition-med),
    padding var(--transition-med);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  text-align: center;
  padding: clamp(20px, 4vw, 36px) 0;
  color: var(--text-muted);
  font-size: clamp(11px, 1.5vw, 13px);
  letter-spacing: 1px;
  transition: padding var(--transition-med);
}

/* ============================================================
   FULLSCREEN TOGGLE (DESKTOP)
   ============================================================ */
.fullscreen-toggle {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 1400;
  padding: 11px 18px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  color: var(--text-primary);
  background: rgba(20, 20, 36, 0.68);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.4px;
  box-shadow: 0 8px 26px rgba(0, 0, 0, 0.28);
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    border-color var(--transition-fast),
    background var(--transition-fast);
}

.fullscreen-toggle:hover {
  transform: translateY(-2px);
  border-color: var(--glass-border-hover);
  background: rgba(30, 30, 52, 0.78);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.34);
}

.fullscreen-toggle:focus-visible {
  outline: 3px solid rgba(167, 139, 250, 0.55);
  outline-offset: 3px;
}

body.is-fullscreen .container {
  justify-content: center;
}

body.is-fullscreen .main-content {
  flex: 0 0 auto;
  align-items: center;
  padding: 0;
}

body.is-fullscreen .back-link,
body.is-fullscreen .spec-link {
  opacity: 0 !important;
  pointer-events: none !important;
  animation-play-state: paused;
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.calendar-card {
  animation: fadeInUp 0.6s ease-out;
}

.datetime-card {
  animation: fadeInUp 0.6s ease-out 0.1s both;
}

.header,
.footer {
  transition:
    opacity var(--transition-med),
    transform var(--transition-med),
    max-height var(--transition-med),
    padding var(--transition-med);
}

/* ============================================================
   PICKER MODAL
   ============================================================ */
.picker-modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.picker-modal.active {
  opacity: 1;
  visibility: visible;
}

.picker-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
}

.picker-content {
  position: relative;
  background: rgba(20, 20, 30, 0.9);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: clamp(20px, 4vw, 32px);
  box-shadow: var(--glass-shadow-lg);
  min-width: clamp(300px, 80vw, 380px);
  transform: scale(0.9) translateY(20px);
  opacity: 0;
  will-change: transform, opacity;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.25s ease;
}

.picker-modal.active .picker-content {
  transform: scale(1) translateY(0);
  opacity: 1;
}

.picker-content-wide {
  min-width: clamp(320px, 85vw, 480px);
}

.picker-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: clamp(16px, 3vw, 24px);
}

.picker-title {
  font-family: var(--font-display);
  font-size: clamp(18px, 4vw, 24px);
  font-weight: 700;
  color: var(--text-primary);
}

.picker-nav-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.picker-nav-btn:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  color: var(--text-primary);
  transform: scale(1.05);
}

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

/* Month Grid */
.month-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(8px, 2vw, 12px);
}

.month-item {
  padding: clamp(10px, 2vw, 14px) clamp(8px, 1.5vw, 12px);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  text-align: center;
  font-size: clamp(14px, 3vw, 16px);
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.month-item:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.month-item.selected {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* Year Grid */
.year-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(8px, 2vw, 12px);
  max-height: 300px;
  overflow-y: auto;
  padding: 4px;
}

.year-item {
  padding: clamp(10px, 2vw, 14px) clamp(6px, 1vw, 10px);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  text-align: center;
  font-size: clamp(14px, 3vw, 16px);
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.year-item:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.year-item.selected {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* Picker Trigger */
.picker-trigger {
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.picker-trigger:hover {
  background: var(--glass-bg-hover);
}

.picker-trigger:active {
  background: var(--glass-bg);
}

/* ============================================================
   RESPONSIVE DESIGN
   ============================================================ */
@media (max-width: 1024px) {
  .main-content {
    grid-template-columns: 1fr;
    gap: clamp(20px, 4vw, 40px);
  }

  .calendar-section,
  .datetime-section {
    justify-content: center;
  }

  .calendar-card,
  .datetime-card {
    max-width: min(480px, 100%);
  }

  .datetime-card {
    order: -1;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .header {
    padding: 24px 0 20px;
  }

  .back-link {
    position: static;
    margin-bottom: 16px;
    font-size: 15px;
  }

  .logo {
    font-size: 38px;
  }

  .subtitle {
    font-size: 13px;
  }

  .calendar-card {
    padding: 20px 16px;
  }

  .datetime-card {
    padding: 28px 20px;
  }

  .nav-btn {
    width: 44px;
    height: 44px;
  }

  .nav-btn img {
    width: 22px;
    height: 22px;
  }

  .current-month {
    font-size: 22px;
  }

  .weekday {
    font-size: 14px;
  }

  .day-cell {
    font-size: 16px;
  }

  .current-year {
    font-size: 18px;
    min-width: 70px;
  }

  .year-btn {
    width: 44px;
    height: 44px;
  }

  .year-btn img {
    width: 20px;
    height: 20px;
  }

  .today-btn {
    font-size: 14px;
  }

  .date-day {
    font-size: 80px;
  }

  .date-weekday {
    font-size: 22px;
  }

  .date-full {
    font-size: 16px;
  }

  .time-hours,
  .time-minutes {
    font-size: 48px;
  }

  .time-separator {
    font-size: 48px;
  }

  .time-seconds {
    font-size: 22px;
  }

  .digital-time {
    font-size: 15px;
  }

  .today-btn-wrapper {
    width: 50px;
  }

  /* Picker modal - larger on mobile */
  .picker-title {
    font-size: 22px;
  }

  .picker-nav-btn {
    width: 44px;
    height: 44px;
  }

  .month-item,
  .year-item {
    font-size: 17px;
  }

  .fullscreen-toggle {
    display: none;
  }
}

/* Mobile portrait: keep the "designated calendar" CTA pinned */
@media (orientation: portrait) and (pointer: coarse) and (max-width: 1024px) {
  .spec-link {
    position: fixed;
    top: max(10px, env(safe-area-inset-top));
    left: 50%;
    transform: translateX(-50%);
    z-index: 1200;
    margin-top: 0;
    padding: 10px 18px;
    width: calc(100% - 32px);
    max-width: 520px;
    justify-content: center;
    animation: spec-link-pulse 3.4s ease-in-out infinite;
  }

  .spec-link:hover {
    transform: translateX(-50%);
  }

  .header {
    padding-top: 90px;
  }
}

@media (orientation: landscape) and (pointer: coarse) and (max-width: 1024px) {
  .spec-link {
    position: static;
    top: auto;
    left: auto;
    transform: none;
    width: auto;
    max-width: none;
    margin-top: 16px;
    animation: spec-link-pulse 2.8s ease-in-out infinite;
  }

  .spec-link:hover {
    transform: translateY(-2px);
  }

  .header {
    padding-top: clamp(24px, 5vw, 48px);
  }
}

@media (pointer: coarse) and (max-width: 1024px) {
  .fullscreen-toggle {
    display: none;
  }
}

/* ============================================================
   CUSTOM SCROLLBAR
   ============================================================ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-base);
}

::-webkit-scrollbar-thumb {
  background: var(--glass-bg-strong);
  border-radius: var(--radius-pill);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--glass-border-hover);
}

/* ============================================================
   SELECTION
   ============================================================ */
::selection {
  background: var(--accent);
  color: var(--bg-base);
}