:root {
  --blue-deep: #0f0f23;
  --blue-mid: #1a1a3e;
  --white-warm: #f5f0eb;
  --white-dim: rgba(245, 240, 235, 0.6);
  --red-accent: #c0392b;
  --red-glow: rgba(192, 57, 43, 0.4);
  --font-display: "Noto Serif SC", "Source Han Serif SC", serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;
  --space-page: clamp(1.25rem, 5vw, 4rem);
  --content-max: 980px;
  --z-floating: 20;
  --z-toast: 30;
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--white-warm);
  background: var(--blue-deep);
  font-family: var(--font-body);
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

[hidden] {
  display: none !important;
}

body::selection {
  color: var(--blue-deep);
  background: var(--white-warm);
}

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

a {
  color: inherit;
}

button {
  font: inherit;
}

:focus-visible {
  outline: 2px solid var(--white-warm);
  outline-offset: 4px;
}

.section {
  position: relative;
  padding: var(--space-page);
}

.auth-screen {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: var(--space-page);
  background: var(--blue-deep);
}

.auth-form {
  width: min(100%, 26rem);
  text-align: center;
}

.auth-label {
  display: block;
  margin: 0 0 1rem;
  color: var(--white-warm);
  font-family: var(--font-display);
  font-size: clamp(2rem, 9vw, 3.25rem);
  font-weight: 600;
  line-height: 1.2;
  text-wrap: balance;
}

.auth-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.65rem;
}

.auth-input,
.auth-button {
  min-height: 3rem;
  border-radius: 8px;
}

.auth-input {
  width: 100%;
  border: 1px solid rgba(245, 240, 235, 0.22);
  padding: 0.7rem 0.9rem;
  color: var(--white-warm);
  background: rgba(26, 26, 62, 0.5);
}

.auth-input[aria-invalid="true"] {
  border-color: var(--red-accent);
}

.auth-button {
  border: 1px solid rgba(192, 57, 43, 0.72);
  padding: 0 1rem;
  color: var(--white-warm);
  background: var(--red-accent);
  cursor: pointer;
  transition:
    transform 160ms ease-out,
    opacity 160ms ease-out;
}

.auth-button:hover {
  transform: translateY(-1px);
}

.auth-button:active {
  transform: translateY(0) scale(0.98);
}

.auth-error {
  min-height: 1.7rem;
  margin: 0.75rem 0 0;
  color: var(--white-dim);
  font-size: 0.95rem;
}

.hero,
.finale {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  overflow: clip;
}

.hero__inner,
.finale__inner {
  width: min(100%, var(--content-max));
  text-align: center;
}

.hero__heart {
  width: min(60vw, 260px);
  margin: 0 auto clamp(1.75rem, 7vw, 3rem);
  opacity: 0;
  transform: scale(0.8);
  filter: drop-shadow(0 0 18px var(--red-glow));
  animation: heartFadeIn 1.5s ease-out forwards;
}

.hero h1,
.section__header h2,
.finale h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.18;
  text-wrap: balance;
}

.hero h1 {
  font-size: clamp(2.3rem, 11vw, 5rem);
}

.hero p {
  max-width: 32rem;
  margin: 1rem auto 0;
  color: var(--white-dim);
  font-family: var(--font-display);
  font-size: clamp(1rem, 3.6vw, 1.25rem);
  text-wrap: pretty;
}

.scroll-cue {
  position: absolute;
  inset-inline-start: 50%;
  inset-block-end: max(1.25rem, env(safe-area-inset-bottom));
  width: 2.75rem;
  height: 2.75rem;
  display: grid;
  place-items: center;
  color: var(--white-dim);
  text-decoration: none;
  transform: translateX(-50%);
  animation: cueFloat 1.8s ease-in-out infinite;
}

.scroll-cue span {
  font-size: 1.75rem;
  line-height: 1;
}

.timeline {
  min-height: 100dvh;
  background: var(--blue-deep);
}

.section__header {
  width: min(100%, var(--content-max));
  margin: 0 auto clamp(2.5rem, 9vw, 5rem);
}

.eyebrow {
  margin: 0 0 0.45rem;
  color: var(--red-accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0;
  text-transform: uppercase;
}

.section__header h2,
.finale h2 {
  font-size: clamp(1.9rem, 7vw, 3.6rem);
}

.timeline__track {
  position: relative;
  width: min(100%, var(--content-max));
  margin: 0 auto;
  display: grid;
  gap: clamp(1.25rem, 4vw, 2rem);
}

.timeline__line {
  display: none;
}

.timeline-node {
  position: relative;
  display: grid;
  grid-template-columns: 1.15rem minmax(0, 1fr);
  gap: 0.9rem;
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 0.6s ease-out,
    transform 0.6s ease-out;
}

.timeline-node.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.timeline-node__marker {
  width: 0.75rem;
  height: 0.75rem;
  margin-top: 1.4rem;
  border-radius: 999px;
  background: var(--white-dim);
}

.timeline-node--confession .timeline-node__marker {
  width: 1.15rem;
  height: 1.15rem;
  margin-left: -0.2rem;
  background: var(--red-accent);
  box-shadow: 0 0 18px var(--red-glow);
}

.timeline-node--month .timeline-node__marker {
  background: rgba(192, 57, 43, 0.76);
  box-shadow: 0 0 12px rgba(192, 57, 43, 0.25);
  animation: markerPulse 2.4s ease-out infinite;
}

.timeline-node__content {
  min-width: 0;
  padding: clamp(1rem, 4vw, 1.4rem);
  border: 1px solid rgba(245, 240, 235, 0.12);
  border-radius: 8px;
  background: rgba(26, 26, 62, 0.42);
}

.timeline-node--confession .timeline-node__content {
  border-color: rgba(192, 57, 43, 0.42);
  background: var(--blue-mid);
  box-shadow: 0 0 24px rgba(192, 57, 43, 0.12);
}

.timeline-node__date,
.timeline-node__source {
  margin: 0;
  color: var(--white-dim);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.timeline-node h3 {
  margin: 0.35rem 0 0.95rem;
  color: var(--white-warm);
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 5vw, 1.8rem);
  font-weight: 600;
  line-height: 1.35;
  text-wrap: balance;
}

.timeline-node blockquote {
  margin: 0;
  padding: 0 0 0 1rem;
  border-left: 2px solid rgba(192, 57, 43, 0.55);
  color: rgba(245, 240, 235, 0.86);
  text-wrap: pretty;
}

.timeline-node blockquote p,
.timeline-node__note {
  overflow-wrap: anywhere;
}

.timeline-node blockquote p {
  margin: 0.5rem 0;
}

.timeline-node__note {
  margin: 0.95rem 0 0;
  color: var(--white-dim);
  font-size: 0.95rem;
  text-wrap: pretty;
}

.timeline-node__source {
  margin-top: 1rem;
  font-size: 0.72rem;
}

.counter {
  margin: clamp(1.2rem, 5vw, 2rem) auto 0;
  color: var(--white-warm);
  font-family: var(--font-mono);
  font-size: clamp(2rem, 11vw, 4rem);
  font-variant-numeric: tabular-nums;
  line-height: 1.15;
  overflow-wrap: anywhere;
}

.finale__line {
  margin: 1.35rem 0 0;
  color: var(--white-dim);
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 4.2vw, 1.35rem);
  text-wrap: balance;
}

.future-modules {
  position: fixed;
  z-index: var(--z-floating);
  inset-inline: 50%;
  inset-block-end: max(1rem, env(safe-area-inset-bottom));
  width: min(calc(100% - 2rem), 28rem);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.35rem;
  padding: 0.35rem;
  border: 1px solid rgba(245, 240, 235, 0.16);
  border-radius: 8px;
  background: rgba(15, 15, 35, 0.94);
  transform: translateX(-50%);
}

.future-modules a {
  min-width: 0;
  min-height: 3rem;
  display: grid;
  place-items: center;
  gap: 0.05rem;
  border-radius: 6px;
  color: rgba(245, 240, 235, 0.76);
  font-size: 0.8rem;
  line-height: 1.15;
  text-align: center;
  text-decoration: none;
  transition:
    background 160ms ease-out,
    color 160ms ease-out,
    transform 160ms ease-out;
}

.future-modules a:hover {
  color: var(--white-warm);
  background: rgba(245, 240, 235, 0.08);
  transform: translateY(-1px);
}

.future-modules a:active {
  transform: translateY(0) scale(0.98);
}

.future-modules span[aria-hidden="true"] {
  font-size: 1.1rem;
  line-height: 1;
}

.version {
  position: absolute;
  inset-inline-start: max(1rem, env(safe-area-inset-left));
  inset-block-end: max(1rem, env(safe-area-inset-bottom));
  max-width: calc(100% - 6rem);
  margin: 0;
  color: rgba(245, 240, 235, 0.42);
  font-family: var(--font-mono);
  font-size: 0.74rem;
}

.moon-button {
  position: absolute;
  z-index: var(--z-floating);
  inset-inline-end: max(1rem, env(safe-area-inset-right));
  inset-block-end: calc(max(1rem, env(safe-area-inset-bottom)) + 4.25rem);
  width: 3rem;
  height: 3rem;
  display: grid;
  place-items: center;
  border: 1px solid rgba(245, 240, 235, 0.2);
  border-radius: 999px;
  color: var(--white-warm);
  background: rgba(15, 15, 35, 0.92);
  cursor: pointer;
  transition:
    transform 160ms ease-out,
    opacity 160ms ease-out;
}

.moon-button:hover {
  transform: translateY(-2px);
}

.moon-button:active {
  transform: translateY(0) scale(0.96);
}

.moon-button span {
  font-size: 1.45rem;
  line-height: 1;
}

.toast {
  position: fixed;
  z-index: var(--z-toast);
  inset-inline: 1rem;
  inset-block-end: calc(max(1rem, env(safe-area-inset-bottom)) + 4.25rem);
  max-width: 28rem;
  margin-inline: auto;
  padding: 0.85rem 1rem;
  border: 1px solid rgba(245, 240, 235, 0.16);
  border-radius: 8px;
  color: var(--white-warm);
  background: rgba(15, 15, 35, 0.96);
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition:
    opacity 180ms ease-out,
    transform 180ms ease-out;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes heartFadeIn {
  from {
    opacity: 0;
    transform: scale(0.8);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes cueFloat {
  0%,
  100% {
    transform: translateX(-50%) translateY(0);
  }

  50% {
    transform: translateX(-50%) translateY(-8px);
  }
}

@keyframes markerPulse {
  0%,
  100% {
    opacity: 0.72;
    transform: scale(1);
  }

  50% {
    opacity: 1;
    transform: scale(1.26);
  }
}

@media (min-width: 768px) {
  .hero__heart {
    width: min(30vw, 310px);
  }

  .timeline__track {
    gap: 2.6rem;
  }

  .timeline__line {
    position: absolute;
    inset-block: 1.5rem;
    inset-inline-start: 8px;
    display: block;
    width: 1px;
    background: rgba(192, 57, 43, 0.52);
  }

  .timeline-node {
    grid-template-columns: 1.15rem minmax(0, 1fr);
    gap: 1.6rem;
  }
}

@media (max-width: 420px) {
  .auth-row {
    grid-template-columns: 1fr;
  }

  .auth-button {
    width: 100%;
  }
}

@media (max-width: 520px) {
  .version {
    inset-block-end: calc(max(1rem, env(safe-area-inset-bottom)) + 4.6rem);
    max-width: calc(100% - 2rem);
  }
}

@media (min-width: 1100px) {
  .timeline__line {
    inset-inline-start: 50%;
  }

  .timeline-node {
    grid-template-columns: minmax(0, 1fr) 1.15rem minmax(0, 1fr);
    gap: 1.75rem;
    align-items: start;
  }

  .timeline-node__marker {
    grid-column: 2;
    justify-self: center;
  }

  .timeline-node__content {
    grid-column: 3;
  }

  .timeline-node:nth-of-type(even) .timeline-node__content {
    grid-column: 1;
    grid-row: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .hero__heart,
  .timeline-node,
  .toast {
    opacity: 1;
    transform: none;
  }
}