/* Design Tokens */
:root {
  color-scheme: dark;
  --bg: #0b0d14;
  --surface: rgba(17, 21, 34, 0.6);
  --surface2: rgba(25, 30, 48, 0.52);
  --text: #eef2ff;
  --muted: #abb4d6;
  --border: rgba(191, 206, 255, 0.2);
  --shadow: 0 16px 40px rgba(4, 9, 24, 0.42);
  --accent: #49a9ff;
  --accent2: #ff4fcf;
  --glass: rgba(255, 255, 255, 0.08);
  --noise-opacity: 0.035;
  --focus: rgba(73, 169, 255, 0.5);
  --container: min(1120px, calc(100% - 2rem));
  --radius-card: 28px;
  --radius-image: 24px;
  --radius-pill: 999px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --dur-fast: 220ms;
  --dur-med: 420ms;
  --dur-slow: 900ms;
  --font:
    -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Inter", "Segoe UI", Roboto,
    Arial, sans-serif;
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f7ff;
  --surface: rgba(255, 255, 255, 0.78);
  --surface2: rgba(245, 250, 255, 0.9);
  --text: #111a2e;
  --muted: #4f5d81;
  --border: rgba(113, 133, 180, 0.28);
  --shadow: 0 14px 36px rgba(46, 64, 108, 0.14);
  --accent: #0f7cff;
  --accent2: #f145af;
  --glass: rgba(255, 255, 255, 0.62);
  --noise-opacity: 0.045;
  --focus: rgba(15, 124, 255, 0.35);
}

/* Base / Reset */
* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  position: relative;
  line-height: 1.5;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: color-mix(in srgb, var(--accent) 30%, transparent);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: var(--container);
  margin-inline: auto;
}

.row {
  display: flex;
  align-items: center;
}

/* Atmosphere Background */
.bg-glow,
.bg-noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -2;
}

.bg-glow {
  background:
    radial-gradient(50rem 50rem at 90% -10%, color-mix(in srgb, var(--accent2) 32%, transparent), transparent 60%),
    radial-gradient(42rem 42rem at 12% 120%, color-mix(in srgb, var(--accent) 35%, transparent), transparent 62%),
    linear-gradient(160deg, color-mix(in srgb, var(--bg) 80%, black), var(--bg));
}

.bg-noise {
  z-index: -1;
  opacity: var(--noise-opacity);
  mix-blend-mode: overlay;
  background-image: radial-gradient(circle at 20% 25%, #fff 0.4px, transparent 0.6px),
    radial-gradient(circle at 80% 70%, #fff 0.45px, transparent 0.65px);
  background-size: 2.5px 2.5px, 3.2px 3.2px;
}

/* Topbar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(14px) saturate(130%);
  -webkit-backdrop-filter: blur(14px) saturate(130%);
}

.topbar-inner {
  justify-content: space-between;
  gap: 1rem;
  min-height: 72px;
}

.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 620;
  letter-spacing: -0.015em;
  font-size: clamp(1.05rem, 0.96rem + 0.32vw, 1.22rem);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.volume-control {
  display: inline-flex;
  align-items: center;
  gap: 0.42rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 0.4rem 0.7rem;
  box-shadow: var(--shadow);
}

.volume-control input[type="range"] {
  width: 98px;
  accent-color: var(--accent);
}

.icon-button {
  appearance: none;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, color-mix(in srgb, var(--glass) 80%, transparent), transparent), var(--surface);
  color: var(--text);
  border-radius: 999px;
  width: 2.5rem;
  height: 2.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.22);
}

.icon-button:hover {
  transform: translateY(-1px);
  border-color: color-mix(in srgb, var(--accent) 44%, var(--border));
}

.icon-button:active {
  transform: translateY(0);
  box-shadow: 0 5px 12px rgba(0, 0, 0, 0.2);
}

.icon,
.icon svg {
  width: 20px;
  height: 20px;
  display: block;
}

.icon-button.is-active {
  border-color: color-mix(in srgb, #ff4fcf 48%, var(--accent));
  box-shadow: 0 10px 24px color-mix(in srgb, #ff4fcf 32%, transparent);
  background: linear-gradient(180deg, rgba(255, 79, 207, 0.26), rgba(73, 169, 255, 0.24));
}

/* LSD Mode */
html[data-lsd="on"] body::after {
  content: "";
  position: fixed;
  inset: -18%;
  pointer-events: none;
  z-index: 2;
  opacity: 0.22;
  mix-blend-mode: screen;
  background: conic-gradient(
    from 0deg,
    rgba(255, 0, 153, 0.55),
    rgba(0, 255, 255, 0.45),
    rgba(76, 0, 255, 0.5),
    rgba(255, 236, 92, 0.44),
    rgba(255, 0, 153, 0.55)
  );
  filter: blur(26px);
  animation: lsd-overlay-spin 8s linear infinite;
}

html[data-lsd="on"] .bg-glow {
  background:
    radial-gradient(44rem 44rem at 8% 15%, rgba(255, 0, 174, 0.54), transparent 58%),
    radial-gradient(54rem 54rem at 88% 2%, rgba(0, 238, 255, 0.46), transparent 60%),
    radial-gradient(42rem 42rem at 14% 93%, rgba(126, 73, 255, 0.44), transparent 64%),
    radial-gradient(38rem 38rem at 92% 86%, rgba(146, 255, 0, 0.3), transparent 60%),
    linear-gradient(130deg, #070a18, #151130 45%, #10171f);
  filter: blur(8px) saturate(2);
  transform: scale(1.04);
  animation: lsd-bg-drift 11s ease-in-out infinite alternate, lsd-hue-spin 9s linear infinite;
}

html[data-lsd="on"] .bg-noise {
  opacity: 0.09;
  animation: lsd-noise-shift 900ms steps(2, end) infinite;
}

html[data-lsd="on"] .topbar,
html[data-lsd="on"] .page-card,
html[data-lsd="on"] .volume-control,
html[data-lsd="on"] .btn,
html[data-lsd="on"] .icon-button {
  backdrop-filter: blur(22px) saturate(190%);
  -webkit-backdrop-filter: blur(22px) saturate(190%);
}

html[data-lsd="on"] .page-card::after {
  content: "";
  position: absolute;
  inset: -14%;
  pointer-events: none;
  opacity: 0.2;
  mix-blend-mode: screen;
  filter: blur(20px);
  background:
    radial-gradient(circle at 20% 30%, rgba(255, 88, 88, 0.35), transparent 42%),
    radial-gradient(circle at 70% 70%, rgba(63, 255, 187, 0.35), transparent 40%),
    radial-gradient(circle at 80% 20%, rgba(191, 92, 255, 0.35), transparent 45%);
  animation: lsd-card-shift 6.5s ease-in-out infinite;
}

html[data-lsd="on"] .title,
html[data-lsd="on"] .badge,
html[data-lsd="on"] .brand {
  text-shadow: 0 0 14px rgba(136, 255, 233, 0.34), 0 0 20px rgba(255, 92, 197, 0.24);
}

html[data-lsd="on"] .media-frame {
  animation: lsd-frame-drift 5.2s ease-in-out infinite;
  box-shadow: 0 24px 52px rgba(6, 0, 36, 0.58);
}

html[data-lsd="on"] .media-frame.loaded .media-image {
  animation: media-float 5.4s ease-in-out infinite, lsd-image-hue 4.2s linear infinite;
}

html[data-lsd="on"] .btn-primary {
  animation: lsd-hue-spin 4.8s linear infinite;
}

/* Main Card Layout */
.main {
  padding: clamp(1.1rem, 2vw, 2rem) 0 clamp(2.2rem, 4vw, 3.2rem);
}

.page-card {
  position: relative;
  overflow: hidden;
  background: linear-gradient(165deg, color-mix(in srgb, var(--surface2) 78%, transparent), var(--surface));
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
  padding: clamp(1rem, 3.5vw, 2.2rem);
  min-height: min(76vh, 760px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.4rem, 3vw, 2.6rem);
  isolation: isolate;
}

.page-card::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-radius: inherit;
  border: 1px solid transparent;
  background: linear-gradient(140deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0) 45%) border-box;
  -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
}

.page-card.glass {
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
}

.page-card.is-entering {
  animation: card-in var(--dur-med) var(--ease);
}

.page-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.35rem, 3vw, 2.2rem);
}

.media-wrap {
  order: -1;
}

.media-frame {
  position: relative;
  width: 100%;
  border-radius: var(--radius-image);
  border: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.33);
  overflow: hidden;
  aspect-ratio: var(--media-ratio, 16 / 10);
  background: color-mix(in srgb, var(--surface2) 65%, #000);
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-radius: inherit;
  background: linear-gradient(170deg, rgba(255, 255, 255, 0.28), rgba(255, 255, 255, 0) 30%);
}

.media-skeleton {
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, rgba(255, 255, 255, 0.06) 20%, rgba(255, 255, 255, 0.2) 30%, rgba(255, 255, 255, 0.06) 42%);
  background-size: 200% 100%;
  animation: shimmer 1.5s linear infinite;
}

.media-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
  opacity: 0;
  transform: scale(1.01);
  transition: opacity var(--dur-med) var(--ease), transform 7s linear;
}

.media-frame.loaded .media-image {
  opacity: 1;
  transform: scale(1.03);
  animation: media-float 8s ease-in-out infinite;
}

.media-frame.loaded .media-skeleton {
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease);
}

/* Typography + Content */
.content {
  display: grid;
  align-content: center;
  gap: 1.05rem;
}

.badge {
  width: fit-content;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.44rem 0.82rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--border));
  background: linear-gradient(140deg, rgba(255, 255, 255, 0.18), rgba(255, 255, 255, 0.02));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18);
  color: color-mix(in srgb, var(--accent) 72%, #fff);
  font-size: clamp(1.2rem, 1rem + 1.6vw, 2.2rem);
  font-weight: 650;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  animation: pop-in var(--dur-med) var(--ease), badge-glow 2.6s ease-in-out infinite;
}

.kicker {
  color: var(--muted);
  font-size: clamp(0.78rem, 0.74rem + 0.21vw, 0.9rem);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.title {
  margin: 0;
  font-size: clamp(2rem, 1.55rem + 2.1vw, 2.75rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.description {
  margin: 0;
  color: var(--muted);
  font-size: clamp(1rem, 0.94rem + 0.28vw, 1.12rem);
  line-height: 1.56;
  max-width: 60ch;
}

.signature {
  margin: 0.15rem 0 0;
  color: color-mix(in srgb, var(--text) 90%, var(--accent2) 10%);
  font-family: "Snell Roundhand", "Bradley Hand", "Segoe Script", "Apple Chancery", cursive;
  font-size: clamp(1.6rem, 1.2rem + 1.6vw, 2.4rem);
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.nav {
  margin-top: clamp(0.4rem, 1vw, 0.7rem);
  display: flex;
  gap: 0.72rem;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: inherit;
  font-size: 0.98rem;
  font-weight: 580;
  padding: 0.78rem 1.3rem;
  min-width: 136px;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.btn-primary {
  color: #fff;
  border-color: color-mix(in srgb, var(--accent) 54%, #fff 8%);
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--accent) 90%, #fff 6%), color-mix(in srgb, var(--accent) 75%, #003067));
  box-shadow: 0 10px 24px color-mix(in srgb, var(--accent) 32%, transparent);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
  filter: brightness(1.07);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: 0 5px 16px color-mix(in srgb, var(--accent) 22%, transparent);
}

.btn-secondary {
  color: var(--text);
  border-color: var(--border);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
}

.btn-secondary:hover:not(:disabled) {
  transform: translateY(-1px);
  border-color: color-mix(in srgb, var(--accent) 36%, var(--border));
  background: color-mix(in srgb, var(--surface2) 84%, transparent);
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.progress {
  margin-top: 0.4rem;
  font-size: 0.85rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* Audio Unlock Overlay */
.audio-unlock {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 80;
  background: color-mix(in srgb, var(--bg) 68%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.audio-unlock.hidden {
  display: none;
}

.audio-unlock-card {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1rem;
  width: min(92vw, 330px);
  text-align: center;
  background: var(--surface2);
  box-shadow: var(--shadow);
}

.audio-unlock-card p {
  margin: 0 0 0.8rem;
  color: var(--muted);
}

.confetti {
  pointer-events: none;
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.confetti-piece {
  position: absolute;
  width: 10px;
  height: 16px;
  border-radius: 3px;
  opacity: 0.9;
  transform: translate3d(0, -18vh, 0);
  animation: confetti-fall 3.2s linear infinite;
}

/* Responsive Layout */
@media (min-width: 900px) {
  .page-card {
    padding: clamp(1.4rem, 3.2vw, 2.6rem);
  }

  .page-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
    gap: clamp(2rem, 3vw, 2.8rem);
  }

  .media-wrap {
    order: 2;
  }

  .content {
    order: 1;
  }
}

@media (hover: hover) and (pointer: fine) {
  .media-frame:hover .media-image {
    transform: scale(1.06);
  }
}

@media (max-width: 600px) {
  .topbar-inner {
    min-height: 64px;
  }

  .volume-control {
    padding-inline: 0.55rem;
  }

  .volume-control input[type="range"] {
    width: 76px;
  }

  .btn {
    flex: 1;
    min-width: 44%;
  }
}

/* Motion Safety */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .media-frame.loaded .media-image {
    transform: none;
  }
}

/* Keyframes */
@keyframes card-in {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.99);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes shimmer {
  from {
    background-position: 200% 0;
  }
  to {
    background-position: -200% 0;
  }
}

@keyframes pop-in {
  0% {
    opacity: 0;
    transform: translateY(3px) scale(0.94);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes badge-glow {
  0%,
  100% {
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18), 0 0 0 rgba(73, 169, 255, 0);
  }
  50% {
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18), 0 0 18px rgba(73, 169, 255, 0.24);
  }
}

@keyframes confetti-fall {
  from {
    transform: translate3d(0, -18vh, 0) rotate(0deg);
  }
  to {
    transform: translate3d(9vw, 110vh, 0) rotate(680deg);
  }
}

@keyframes media-float {
  0%,
  100% {
    transform: scale(1.03) translateY(0);
  }
  50% {
    transform: scale(1.08) translateY(-1.4%);
  }
}

@keyframes lsd-overlay-spin {
  from {
    transform: rotate(0deg) scale(1);
  }
  to {
    transform: rotate(360deg) scale(1.08);
  }
}

@keyframes lsd-bg-drift {
  0% {
    transform: scale(1.03) translate3d(-1%, 0, 0);
  }
  50% {
    transform: scale(1.07) translate3d(1%, -1.5%, 0);
  }
  100% {
    transform: scale(1.04) translate3d(-0.5%, 1%, 0);
  }
}

@keyframes lsd-hue-spin {
  0% {
    filter: hue-rotate(0deg);
  }
  100% {
    filter: hue-rotate(360deg);
  }
}

@keyframes lsd-noise-shift {
  0% {
    transform: translate3d(0, 0, 0);
  }
  33% {
    transform: translate3d(-0.7%, 0.6%, 0);
  }
  66% {
    transform: translate3d(0.8%, -0.6%, 0);
  }
  100% {
    transform: translate3d(0, 0, 0);
  }
}

@keyframes lsd-card-shift {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  50% {
    transform: translate3d(1.2%, -1%, 0) scale(1.05);
  }
}

@keyframes lsd-frame-drift {
  0%,
  100% {
    transform: translate3d(0, 0, 0) rotate(0deg);
  }
  50% {
    transform: translate3d(0.7%, -0.8%, 0) rotate(-0.4deg);
  }
}

@keyframes lsd-image-hue {
  0% {
    filter: saturate(1.85) contrast(1.15) brightness(1.08) hue-rotate(0deg);
  }
  50% {
    filter: saturate(2.2) contrast(1.24) brightness(1.15) hue-rotate(155deg);
  }
  100% {
    filter: saturate(1.85) contrast(1.15) brightness(1.08) hue-rotate(320deg);
  }
}