/* ── Custom Properties ───────────────────────────────────────── */
:root {
  --bg-base:          #0d0f12;
  --bg-surface:       #131720;
  --bg-card:          #161b24;
  --bg-card-hover:    #1b2130;

  --border-subtle:    rgba(255, 255, 255, 0.06);
  --border-card:      rgba(255, 255, 255, 0.09);
  --border-accent:    rgba(110, 168, 254, 0.35);

  --accent-primary:   #6ea8fe;
  --accent-glow:      rgba(110, 168, 254, 0.12);
  --accent-dim:       rgba(110, 168, 254, 0.55);
  --accent-badge-bg:  rgba(110, 168, 254, 0.1);
  --accent-badge-br:  rgba(110, 168, 254, 0.2);

  --text-primary:     #e8eaf0;
  --text-secondary:   #8b95a6;
  --text-tertiary:    #525e70;
  --text-time:        #f0f4ff;
  --text-accent:      #6ea8fe;

  --bg-radial:        rgba(110, 168, 254, 0.07);

  --shadow-card:      0 2px 12px rgba(0, 0, 0, 0.4),
                      0 1px 3px rgba(0, 0, 0, 0.5);
  --shadow-hover:     0 8px 32px rgba(0, 0, 0, 0.6),
                      0 2px 8px rgba(0, 0, 0, 0.4),
                      0 0 0 1px rgba(110, 168, 254, 0.18),
                      0 0 24px rgba(110, 168, 254, 0.06);

  --radius-card:      14px;
  --radius-badge:     5px;

  --font-ui:          -apple-system, BlinkMacSystemFont, "Segoe UI",
                      "Helvetica Neue", Arial, sans-serif;
  --font-mono:        "SF Mono", "Cascadia Code", "Fira Code",
                      "Consolas", "Courier New", monospace;

  --transition-card:  200ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

:root[data-theme="light"] {
  --bg-base:          #f5f7fa;
  --bg-surface:       #ffffff;
  --bg-card:          #ffffff;
  --bg-card-hover:    #fbfcfe;

  --border-subtle:    rgba(15, 23, 42, 0.06);
  --border-card:      rgba(15, 23, 42, 0.09);
  --border-accent:    rgba(37, 99, 235, 0.35);

  --accent-primary:   #2563eb;
  --accent-glow:      rgba(37, 99, 235, 0.08);
  --accent-dim:       rgba(37, 99, 235, 0.45);
  --accent-badge-bg:  rgba(37, 99, 235, 0.08);
  --accent-badge-br:  rgba(37, 99, 235, 0.2);

  --text-primary:     #0f172a;
  --text-secondary:   #475569;
  --text-tertiary:    #94a3b8;
  --text-time:        #0b1220;
  --text-accent:      #2563eb;

  --bg-radial:        rgba(37, 99, 235, 0.08);

  --shadow-card:      0 1px 2px rgba(15, 23, 42, 0.04),
                      0 2px 8px rgba(15, 23, 42, 0.06);
  --shadow-hover:     0 8px 28px rgba(15, 23, 42, 0.10),
                      0 2px 6px rgba(15, 23, 42, 0.06),
                      0 0 0 1px rgba(37, 99, 235, 0.18),
                      0 0 24px rgba(37, 99, 235, 0.05);
}

/* ── Reset & Base ────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-base);
  background-image:
    radial-gradient(
      ellipse 80% 50% at 50% -10%,
      var(--bg-radial) 0%,
      transparent 70%
    );
  color: var(--text-primary);
  font-family: var(--font-ui);
  min-height: 100dvh;
  padding: 3rem 1.5rem 4rem;
  transition: background-color var(--transition-card),
              color var(--transition-card);
}

/* ── Page Header ─────────────────────────────────────────────── */
.page-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.page-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-accent);
  margin-bottom: 1rem;
  opacity: 0.8;
}

.page-eyebrow::before,
.page-eyebrow::after {
  content: '';
  display: block;
  width: 28px;
  height: 1px;
  background: var(--accent-dim);
}

.page-title {
  font-family: var(--font-ui);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--text-primary);
}

.page-title-accent {
  color: var(--text-accent);
}

.page-subtitle {
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
}

/* ── Clock Grid ──────────────────────────────────────────────── */
.clock-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  max-width: 1080px;
  margin: 0 auto;
}

.clock-grid[data-clock-mode="analog"] .time-display { display: none; }
.clock-grid[data-clock-mode="digital"] .analog-display { display: none; }

@media (max-width: 860px) {
  .clock-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 520px) {
  .clock-grid {
    grid-template-columns: 1fr;
  }

  body {
    padding: 2rem 1rem 3rem;
  }
}

/* ── Clock Card ──────────────────────────────────────────────── */
.clock-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-card);
  padding: 1.75rem 1.75rem 1.625rem;
  box-shadow: var(--shadow-card);
  cursor: default;
  position: relative;
  overflow: hidden;
  transition:
    transform var(--transition-card),
    box-shadow var(--transition-card),
    background-color var(--transition-card),
    border-color var(--transition-card);

  /* Entrance animation */
  animation: cardReveal 0.5s cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

.clock-card:nth-child(1) { animation-delay: 0.04s; }
.clock-card:nth-child(2) { animation-delay: 0.09s; }
.clock-card:nth-child(3) { animation-delay: 0.14s; }
.clock-card:nth-child(4) { animation-delay: 0.19s; }
.clock-card:nth-child(5) { animation-delay: 0.24s; }
.clock-card:nth-child(6) { animation-delay: 0.29s; }

@keyframes cardReveal {
  from {
    opacity: 0;
    transform: translateY(18px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Top-edge accent line */
.clock-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--accent-dim) 30%,
    var(--accent-primary) 50%,
    var(--accent-dim) 70%,
    transparent 100%
  );
  opacity: 0;
  transition: opacity var(--transition-card);
}

/* Subtle glow behind card on hover */
.clock-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-card);
  background: radial-gradient(
    ellipse 80% 60% at 50% 0%,
    var(--accent-glow) 0%,
    transparent 70%
  );
  opacity: 0;
  transition: opacity var(--transition-card);
  pointer-events: none;
}

.clock-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  background-color: var(--bg-card-hover);
  border-color: var(--border-accent);
}

.clock-card:hover::before { opacity: 1; }
.clock-card:hover::after  { opacity: 1; }

/* ── Card Inner Layout ───────────────────────────────────────── */
.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1.375rem;
}

.city-name {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  line-height: 1.2;
}

.city-country {
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  letter-spacing: 0.04em;
  margin-top: 0.2rem;
  text-transform: uppercase;
}

.tz-badge {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-accent);
  background: var(--accent-badge-bg);
  border: 1px solid var(--accent-badge-br);
  border-radius: var(--radius-badge);
  padding: 0.25em 0.55em;
  line-height: 1;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

/* ── Time Display ────────────────────────────────────────────── */
.time-display {
  position: relative;
}

.time-hm {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4vw, 2.5rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--text-time);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.time-sep {
  opacity: 0.45;
  display: inline-block;
  animation: colonBlink 1s step-start infinite;
}

@keyframes colonBlink {
  0%,  49% { opacity: 0.45; }
  50%, 100% { opacity: 0.12; }
}

.time-seconds-row {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-top: 0.375rem;
}

.time-ss {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
}

.time-ampm {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-accent);
  opacity: 0.85;
}

/* ── Analog Display ──────────────────────────────────────────── */
.analog-display {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0.5rem 0;
}

.clock-face {
  width: 140px;
  height: 140px;
}

.clock-face .face {
  fill: none;
  stroke: var(--border-subtle);
  stroke-width: 1.5;
}

.clock-face .hand {
  stroke-linecap: round;
  transform-origin: 70px 70px;
}

.clock-face .hour-hand {
  stroke: var(--text-primary);
  stroke-width: 3.5;
}

.clock-face .minute-hand {
  stroke: var(--text-secondary);
  stroke-width: 2.5;
}

.clock-face .second-hand {
  stroke: var(--accent-primary);
  stroke-width: 1.5;
}

.clock-face .center-dot {
  fill: var(--accent-primary);
}

/* ── Date Display ────────────────────────────────────────────── */
.card-divider {
  height: 1px;
  background: var(--border-subtle);
  margin: 1.125rem 0 0.875rem;
}

.date-display {
  font-size: 0.75rem;
  color: var(--text-secondary);
  letter-spacing: 0.01em;
}

/* ── Footer ──────────────────────────────────────────────────── */
.page-footer {
  text-align: center;
  margin-top: 3rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  letter-spacing: 0.08em;
  opacity: 0.6;
}

/* ── Live indicator dot ──────────────────────────────────────── */
.live-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4);
  animation: livePulse 2s ease-out infinite;
  vertical-align: middle;
  margin-right: 0.375rem;
}

@keyframes livePulse {
  0%   { box-shadow: 0 0 0 0   rgba(34, 197, 94, 0.5); }
  60%  { box-shadow: 0 0 0 6px rgba(34, 197, 94, 0);   }
  100% { box-shadow: 0 0 0 0   rgba(34, 197, 94, 0);   }
}

/* ── Toggles ─────────────────────────────────────────────────── */
.toggle-group {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  z-index: 10;
  display: flex;
  gap: 0.5rem;
}

.btn-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border-card);
  border-radius: 999px;
  box-shadow: var(--shadow-card);
  cursor: pointer;
  transition:
    background-color var(--transition-card),
    color var(--transition-card),
    border-color var(--transition-card),
    transform var(--transition-card);
  font: inherit;
}

.btn-toggle:hover {
  color: var(--text-accent);
  border-color: var(--border-accent);
  transform: translateY(-1px);
}

.btn-toggle:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.btn-toggle svg {
  width: 1.125rem;
  height: 1.125rem;
  display: block;
}

.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }

:root[data-theme="light"] .theme-toggle .icon-sun  { display: block; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: none; }