.theme-dark {
  --background: #040a13;
  --background-alt: rgba(12, 22, 35, 0.68);
  --background-alt-strong: rgba(8, 17, 28, 0.86);
  --text-primary: #f2f6ff;
  --text-secondary: rgba(198, 212, 235, 0.85);
  --accent: #6ac7ff;
  --accent-strong: #7be0ff;
  --panel-border: rgba(120, 150, 200, 0.2);
  --panel-grid: rgba(120, 150, 200, 0.1);
  --header-backdrop: rgba(5, 11, 22, 0.55);
  --footer-backdrop: rgba(6, 11, 22, 0.68);
  --button-text: #041021;
  --button-gradient-start: #6fd3ff;
  --button-gradient-mid: #7f7bff;
  --button-gradient-end: #4ff5c2;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
}

.theme-light {
  --background: #f5f1e8;
  --background-alt: rgba(255, 250, 243, 0.78);
  --background-alt-strong: rgba(255, 255, 250, 0.92);
  --text-primary: #1a2431;
  --text-secondary: rgba(36, 48, 66, 0.8);
  --accent: #3c8bf1;
  --accent-strong: #236bd7;
  --panel-border: rgba(70, 90, 140, 0.12);
  --panel-grid: rgba(70, 90, 140, 0.08);
  --header-backdrop: rgba(255, 253, 247, 0.86);
  --footer-backdrop: rgba(245, 240, 232, 0.94);
  --button-text: #f8fbff;
  --button-gradient-start: #6bbcff;
  --button-gradient-mid: #ff9f7b;
  --button-gradient-end: #ffd86b;
  --shadow: 0 18px 55px rgba(80, 62, 40, 0.16);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  font-family: "Inter", "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--background);
  color: var(--text-primary);
  scroll-behavior: smooth;
}

body {
  position: relative;
  transition: background 0.6s ease, color 0.6s ease;
}

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

.site-header {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  width: min(1180px, calc(100% - 48px));
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  backdrop-filter: blur(16px);
  background: var(--header-backdrop);
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.site-brand {
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 18px;
}

.site-nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 4px 0;
  position: relative;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.25s ease;
  opacity: 0.7;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.toggle-button {
  border: 1px solid var(--panel-border);
  background: var(--background-alt);
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease, transform 0.25s ease;
}

.toggle-button:hover,
.toggle-button:focus-visible {
  background: var(--background-alt-strong);
  color: var(--text-primary);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.scene-layer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  z-index: 0;
}

#scene-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.content {
  position: relative;
  z-index: 10;
  padding-top: 140px;
}

.content--lifted {
  padding-top: 120px;
}

.content--lifted section {
  min-height: 60vh;
  align-items: flex-start;
  padding-top: 60px;
}

section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
}

.panel {
  max-width: min(860px, 100%);
  padding: 48px 56px;
  border-radius: 28px;
  border: 1px solid var(--panel-border);
  background:
    linear-gradient(135deg, transparent 0%, var(--panel-grid) 100%),
    var(--background-alt);
  backdrop-filter: blur(22px);
  box-shadow: var(--shadow);
  display: grid;
  gap: 18px;
}

.panel--minimal {
  background: transparent;
  border: none;
  box-shadow: none;
  backdrop-filter: none;
}

.panel h1,
.panel h2 {
  margin: 0;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.panel h1 {
  font-size: clamp(2.6rem, 5vw, 4.1rem);
}

.panel h2 {
  font-size: clamp(2.1rem, 4vw, 3rem);
}

.panel.life-visual {
  max-width: min(1040px, 100%);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 36px;
}

.panel p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.6;
}

.primary-action {
  justify-self: start;
  border: none;
  border-radius: 999px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  background: linear-gradient(
    115deg,
    var(--button-gradient-start) 0%,
    var(--button-gradient-mid) 45%,
    var(--button-gradient-end) 100%
  );
  background-size: 200% 200%;
  color: var(--button-text);
  box-shadow: 0 15px 35px rgba(20, 60, 140, 0.45);
  transition: transform 0.25s ease, box-shadow 0.25s ease, filter 0.25s ease;
  animation: primaryActionFlow 10s ease-in-out infinite;
}

.primary-action:hover,
.primary-action:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 20px 45px rgba(20, 60, 140, 0.55);
  filter: brightness(1.05);
}

@keyframes primaryActionFlow {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

.section-caption {
  text-transform: uppercase;
  letter-spacing: 0.25em;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.site-footer {
  position: relative;
  z-index: 12;
  margin-top: 80px;
  padding: 48px 24px 32px;
  text-align: center;
  font-size: 0.95rem;
  color: var(--text-secondary);
  background: var(--footer-backdrop);
  border-top: 1px solid var(--panel-border);
}

.cards {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
  padding: 28px;
  border-radius: 20px;
  background:
    linear-gradient(160deg, transparent 0%, var(--panel-grid) 100%),
    var(--background-alt);
  border: 1px solid var(--panel-border);
  box-shadow: var(--shadow);
  display: grid;
  gap: 12px;
}

.card h3 {
  margin: 0;
  font-size: 1.35rem;
}

.card p {
  margin: 0;
  color: var(--text-secondary);
}

.card .placeholder-button {
  justify-self: start;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--panel-border);
  background: var(--background-alt);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

.clock-wrapper {
  display: grid;
  gap: 32px;
}

.primary-clock {
  padding: 32px;
  border-radius: 24px;
  border: 1px solid var(--panel-border);
  background:
    linear-gradient(160deg, transparent 0%, var(--panel-grid) 100%),
    var(--background-alt);
  box-shadow: var(--shadow);
  text-align: center;
}

.primary-clock .clock-time {
  font-size: clamp(3rem, 7vw, 5.4rem);
  font-weight: 600;
  letter-spacing: 0.08em;
}

.clock-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.clock-card {
  padding: 22px;
  border-radius: 18px;
  border: 1px solid var(--panel-border);
  background:
    linear-gradient(180deg, transparent 0%, var(--panel-grid) 100%),
    var(--background-alt);
  box-shadow: var(--shadow);
  display: grid;
  gap: 6px;
}

.clock-card .city {
  font-weight: 600;
  font-size: 1.1rem;
}

.clock-card .time {
  font-size: 1.4rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
}

.clock-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.clock-controls input,
.clock-controls select {
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--panel-border);
  background: var(--background-alt);
  color: var(--text-primary);
  font-size: 0.95rem;
}

.clock-controls button {
  padding: 10px 18px;
  border-radius: 12px;
  border: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: var(--button-text);
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  box-shadow: 0 12px 25px rgba(20, 60, 140, 0.4);
}

.clock-controls button:hover,
.clock-controls button:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 16px 30px rgba(20, 60, 140, 0.45);
}

.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;
}

.life-controls form {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-top: 18px;
}

.life-controls label,
.life-controls fieldset {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.life-controls input,
.life-controls select {
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--panel-border);
  background: var(--background-alt);
  color: var(--text-primary);
  font-size: 0.95rem;
}

.life-controls fieldset {
  border: 1px dashed var(--panel-border);
  border-radius: 18px;
  padding: 12px 16px;
}

.life-controls legend {
  padding: 0 6px;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-secondary);
}

.radio-option {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
}

.life-caption {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 10px;
}

.life-visual {
  padding: 32px;
  overflow: visible;
}

.life-grid {
  display: grid;
  gap: 10px;
  padding-bottom: 60px;
  width: max-content;
  margin: 0 auto;
}

.life-row {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 10px;
  align-items: center;
}

.life-year {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-align: right;
}

.weeks-wrap {
  display: grid;
  grid-template-columns: repeat(52, 12px);
  gap: 6px;
  justify-content: flex-start;
}

.week {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 1px solid rgba(120, 150, 200, 0.15);
  background: rgba(255, 255, 255, 0.05);
  transition: transform 0.2s ease, background 0.3s ease;
}

.week--complete {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
}

.week--current {
  box-shadow: 0 0 0 3px rgba(44, 127, 246, 0.35);
  transform: scale(1.2);
}

.longevity-row {
  display: grid;
  grid-template-columns: 120px 1fr auto;
  align-items: center;
  gap: 12px;
  padding-left: 60px;
}

.longevity-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.longevity-bar {
  position: relative;
  height: 6px;
  border-radius: 999px;
  background: rgba(80, 120, 180, 0.2);
  overflow: hidden;
}

.longevity-fill {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  border-radius: inherit;
  background: linear-gradient(120deg, var(--accent), var(--accent-strong));
}

.longevity-value {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

@media (max-width: 760px) {
  .life-row {
    grid-template-columns: 50px 1fr;
  }
  .longevity-row {
    grid-template-columns: 1fr;
    padding-left: 0;
  }
  .longevity-label {
    order: -1;
  }
}

@media (max-width: 840px) {
  .site-header {
    top: 16px;
    padding-inline: 18px;
  }

  .panel {
    padding: 36px;
  }

  .primary-action {
    width: 100%;
    justify-self: stretch;
    text-align: center;
  }
}

@media (max-width: 560px) {
  .site-header {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .site-nav {
    flex-wrap: wrap;
    justify-content: center;
  }

  .header-controls {
    justify-content: center;
  }

  section {
    padding-inline: 16px;
  }

  .panel {
    padding: 28px;
  }
}