/* ==========================================================================
   贾怀奥 · 十八岁生日档案
   Ark UI — family: corporate (black / white / acid lime) — depth: complex
   Original clean-room implementation. No proprietary assets or fonts.
   ========================================================================== */

/* --- 1. Tokens ----------------------------------------------------------- */

:root {
  /* corporate family */
  --ink: #050505;
  --ink-soft: #0b0b0b;
  --ink-panel: #101010;
  --paper: #f3f3f3;
  --paper-dim: rgba(243, 243, 243, 0.62);
  --paper-faint: rgba(243, 243, 243, 0.34);
  --signal: #f3ff00;
  --signal-ink: #050505;
  --muted: #8a8a8a;
  --line: rgba(243, 243, 243, 0.14);
  --line-strong: rgba(243, 243, 243, 0.3);
  --panel: rgba(5, 5, 5, 0.86);
  --panel-veil: rgba(5, 5, 5, 0.62);

  /* typography */
  --font-ui: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-display: "Arial Narrow", "Helvetica Neue Condensed", "Roboto Condensed",
    "DIN Condensed", Impact, var(--font-ui);
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* geometry */
  --rail-w: 76px;
  --topbar-h: 72px;
  --radius: 0px;
  --gutter: clamp(1.25rem, 4vw, 4.5rem);
  --section-pad: clamp(4.5rem, 9vw, 9rem);

  /* motion */
  --dur-direct: 240ms;
  --dur-reveal: 650ms;
  --ease: cubic-bezier(0.22, 0.8, 0.2, 1);

  /* depth layer (overridden per data-ark-depth) */
  --stage-layer-opacity: 0.5;
  --instrument-shadow: 0.55rem 0.55rem 0 rgba(243, 255, 0, 0.08);
}

/* depth: identity layer only */
[data-ark-depth="minimal"] {
  --stage-layer-opacity: 0.16;
  --instrument-shadow: none;
}

[data-ark-depth="minimal"] .stage-art,
[data-ark-depth="minimal"] .chapter-track,
[data-ark-depth="minimal"] .countdown-note {
  display: none;
}

/* depth: shell + one stage layer */
[data-ark-depth="moderate"] {
  --stage-layer-opacity: 0.32;
}

[data-ark-depth="moderate"] .stage-art-mark {
  display: none;
}

/* depth: full shared system */
[data-ark-depth="complex"] {
  --stage-layer-opacity: 0.5;
}

/* --- 2. Reset ------------------------------------------------------------ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100svh;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-ui);
  font-size: clamp(0.95rem, 0.92rem + 0.15vw, 1.0625rem);
  line-height: 1.7;
  letter-spacing: 0.01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
p,
dl,
dd,
ol,
ul,
figure {
  margin: 0;
}

ol,
ul {
  padding: 0;
  list-style: none;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

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

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 60;
  padding: 0.7rem 1.1rem;
  background: var(--signal);
  color: var(--signal-ink);
  font-weight: 700;
  letter-spacing: 0.06em;
  transform: translateY(-160%);
  transition: transform var(--dur-direct) var(--ease);
}

.skip-link:focus {
  transform: none;
}

/* 跳转目标：保留可见指示，但以内描边呈现，避免整屏描边 */
.main:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: -2px;
}

/* stage grid texture — one coherent stage layer for the whole page */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: calc(var(--stage-layer-opacity) * 0.28);
  background-image: linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 5.5rem 5.5rem;
  mask-image: radial-gradient(120% 90% at 70% 0%, #000 0%, transparent 78%);
}

/* --- 3. Shell ----------------------------------------------------------- */

.shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  grid-template-rows: var(--topbar-h) minmax(0, 1fr) auto auto;
  min-height: 100svh;
}

/* 3.1 Topbar */
.topbar {
  grid-column: 1 / -1;
  grid-row: 1;
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: clamp(1rem, 3vw, 3rem);
  padding: 0 clamp(1rem, 3vw, 2rem);
  background: var(--panel);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 44px;
  flex: 0 0 auto;
}

.brand-mark {
  width: 1.75rem;
  height: 1.75rem;
  border: 1px solid var(--line-strong);
  background: linear-gradient(135deg, transparent 46%, var(--signal) 46% 58%, transparent 58%);
  flex: 0 0 auto;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-text strong {
  font-size: 1rem;
  letter-spacing: 0.16em;
  font-weight: 700;
}

.brand-text small,
.footer-brand small {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.22em;
  color: var(--muted);
}

.topbar-status {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--paper-dim);
  text-transform: uppercase;
  min-width: 0;
}

.topbar-status span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.status-dot {
  width: 7px;
  height: 7px;
  background: var(--signal);
  flex: 0 0 auto;
  animation: pulse 1.8s var(--ease) infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.3;
    transform: scale(0.7);
  }
}

.topbar-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 2vw, 1.75rem);
}

.topbar-nav a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  min-height: 44px;
  padding: 0 0.15rem;
  align-items: center;
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--paper-dim);
  border-bottom: 2px solid transparent;
  transition: color var(--dur-direct) var(--ease), border-color var(--dur-direct) var(--ease);
}

.topbar-nav a span {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--signal);
}

.topbar-nav a:hover,
.topbar-nav a[aria-current="true"] {
  color: var(--paper);
  border-bottom-color: var(--signal);
}

/* 3.2 Rail */
.rail {
  grid-column: 1;
  grid-row: 2 / -1;
  position: sticky;
  top: var(--topbar-h);
  align-self: start;
  height: calc(100svh - var(--topbar-h));
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  padding: 1.5rem 0;
  border-right: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(5, 5, 5, 0.9), rgba(5, 5, 5, 0.4));
}

.rail-list {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  width: 100%;
}

.rail-list a {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.15rem;
  padding: 0.85rem 0.25rem;
  min-height: 44px;
  color: var(--paper-faint);
  transition: color var(--dur-direct) var(--ease), background var(--dur-direct) var(--ease);
}

.rail-list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--signal);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--dur-direct) var(--ease);
}

.rail-index {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.rail-list b {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.rail-list small {
  font-family: var(--font-mono);
  font-size: 0.5rem;
  letter-spacing: 0.16em;
  opacity: 0.7;
}

.rail-list a:hover,
.rail-list a[aria-current="true"] {
  color: var(--paper);
  background: rgba(243, 255, 0, 0.06);
}

.rail-list a[aria-current="true"]::before {
  transform: scaleY(1);
}

.rail-list a[aria-current="true"] .rail-index {
  color: var(--signal);
}

.rail-note {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.18em;
  color: var(--muted);
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

/* 3.3 Main */
.main {
  grid-column: 2;
  grid-row: 2;
  min-width: 0;
}

.section {
  position: relative;
  border-bottom: 1px solid var(--line);
}

.section-inner {
  padding: var(--section-pad) var(--gutter);
  max-width: 1180px;
}

.section--stage {
  border-bottom: 1px solid var(--line);
}

/* --- 4. Hero (01) -------------------------------------------------------- */

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: end;
  padding: clamp(3.5rem, 7vw, 7rem) var(--gutter) clamp(2.5rem, 4vw, 4rem);
  min-height: min(78svh, 46rem);
}

.stage-art {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  opacity: var(--stage-layer-opacity);
}

.stage-art-grid {
  position: absolute;
  inset: clamp(1rem, 4vw, 3rem) clamp(1rem, 4vw, 3rem) 0 auto;
  width: min(46%, 34rem);
  border: 1px solid var(--line);
  background-image: linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 3rem 3rem;
}

.stage-art-panel {
  position: absolute;
  right: 0;
  top: 12%;
  width: min(38%, 26rem);
  height: 76%;
  background: linear-gradient(200deg, rgba(243, 243, 243, 0.09), rgba(5, 5, 5, 0) 62%);
  border-left: 1px solid var(--line);
}

.stage-art-scan {
  position: absolute;
  top: 12%;
  bottom: 12%;
  right: min(16%, 11rem);
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--signal), transparent);
  animation: scan 6s var(--ease) infinite;
}

@keyframes scan {
  0%,
  100% {
    transform: translateX(-26px);
    opacity: 0.35;
  }
  50% {
    transform: translateX(26px);
    opacity: 1;
  }
}

.stage-art-mark {
  position: absolute;
  right: clamp(1rem, 4vw, 3rem);
  bottom: -0.12em;
  font-family: var(--font-display);
  font-size: clamp(6rem, 20vw, 18rem);
  font-weight: 900;
  line-height: 0.8;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(243, 243, 243, 0.22);
}

.hero-copy {
  position: relative;
  max-width: 44rem;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--signal);
  margin-bottom: clamp(1rem, 2vw, 1.75rem);
}

.kicker::before {
  content: "";
  width: 2.5rem;
  height: 2px;
  background: var(--signal);
  flex: 0 0 auto;
}

.display {
  font-family: var(--font-ui);
  font-weight: 900;
  font-size: clamp(3.25rem, 9.5vw, 8rem);
  line-height: 0.94;
  letter-spacing: -0.045em;
  margin-bottom: clamp(1.25rem, 2.5vw, 2rem);
}

.display-line {
  display: block;
}

.display-line--outline {
  color: transparent;
  -webkit-text-stroke: 1px rgba(243, 243, 243, 0.55);
}

@supports not (-webkit-text-stroke: 1px #000) {
  .display-line--outline {
    color: rgba(243, 243, 243, 0.32);
  }
}

.lede {
  max-width: 34rem;
  color: var(--paper-dim);
  margin-bottom: clamp(1.75rem, 3vw, 2.5rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0 1.5rem;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--paper);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  transition: background var(--dur-direct) var(--ease), color var(--dur-direct) var(--ease),
    border-color var(--dur-direct) var(--ease), transform var(--dur-direct) var(--ease);
}

.btn::before {
  content: "→";
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--signal);
  transition: transform var(--dur-direct) var(--ease);
}

.btn:hover {
  border-color: var(--paper);
  transform: translateX(2px);
}

.btn:hover::before {
  transform: translateX(3px);
}

.btn--primary {
  background: var(--signal);
  color: var(--signal-ink);
  border-color: var(--signal);
}

.btn--primary::before {
  color: var(--signal-ink);
}

.btn--primary:hover {
  background: #ffffff;
  border-color: #ffffff;
}

.btn--ghost {
  border-color: var(--line);
  color: var(--paper-dim);
  font-size: 0.8125rem;
}

.btn--ghost::before {
  content: none;
}

.hero-foot {
  margin-top: clamp(2rem, 4vw, 3rem);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero-foot span {
  color: var(--signal);
  margin: 0 0.5rem;
}

/* 4.1 Dossier + countdown */
.dossier {
  position: relative;
  align-self: end;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--instrument-shadow);
}

.dossier-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.dossier-head strong {
  color: var(--signal);
  font-weight: 600;
}

.dossier-list > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--line);
}

.dossier-list dt {
  font-size: 0.8125rem;
  color: var(--muted);
  letter-spacing: 0.06em;
}

.dossier-list dd {
  font-weight: 600;
  letter-spacing: 0.04em;
  text-align: right;
}

.countdown {
  padding: 1.1rem 1rem 1.25rem;
  border-top: 1px solid var(--line);
}

.countdown-label {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.countdown-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3.6vw, 2.15rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.2;
  margin: 0.35rem 0 0.15rem;
  color: var(--paper);
}

.countdown-value.is-today {
  color: var(--signal);
}

.countdown-state {
  font-size: 0.8125rem;
  color: var(--paper-dim);
}

.countdown-scale {
  display: grid;
  grid-template-columns: repeat(18, 1fr);
  gap: 3px;
  margin: 0.9rem 0 0.5rem;
  height: 10px;
}

.countdown-scale i {
  background: rgba(243, 243, 243, 0.16);
  transition: background var(--dur-direct) var(--ease), box-shadow var(--dur-direct) var(--ease);
}

.countdown-scale i.is-lit {
  background: var(--signal);
  box-shadow: 0 0 8px rgba(243, 255, 0, 0.55);
}

.countdown-note {
  font-size: 0.6875rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* 4.2 Chapter track */
.chapter-track {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.chapter-track li + li {
  border-left: 1px solid var(--line);
}

.chapter-track a {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.25rem var(--gutter) 1.4rem;
  min-height: 44px;
  transition: background var(--dur-direct) var(--ease);
}

.chapter-track small {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.chapter-track strong {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.chapter-track a:hover {
  background: rgba(243, 255, 0, 0.07);
}

.chapter-track a:hover small {
  color: var(--signal);
}

/* --- 5. Section head ---------------------------------------------------- */

.section-head {
  position: relative;
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--font-ui);
  font-weight: 900;
  font-size: clamp(2rem, 5vw, 3.75rem);
  line-height: 0.95;
  letter-spacing: -0.03em;
}

.section-head .rule {
  display: block;
  height: 1px;
  margin-top: 1.25rem;
  background: linear-gradient(90deg, var(--signal), var(--line) 22%, transparent 72%);
}

.section-lede {
  max-width: 42rem;
  color: var(--paper-dim);
  margin-bottom: clamp(2.25rem, 4vw, 3.5rem);
}

/* 入场遮罩只在脚本可用时启用，避免禁用脚本时内容被永久裁掉 */
html.js [data-reveal] {
  clip-path: inset(0 100% 0 0);
  transform: translateX(-12px);
  transition: clip-path var(--dur-reveal) var(--ease), transform var(--dur-reveal) var(--ease);
}

html.js [data-reveal][data-visible="true"] {
  clip-path: inset(0);
  transform: none;
}

/* --- 6. Archive timeline (02) ------------------------------------------- */

/* 单元格用自身描边而不是“间隙露底色”，这样最后一行不满时不会留下灰块 */
.timeline {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.timeline-item {
  background: var(--ink);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 1.5rem 1.25rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-height: 14rem;
}

.timeline-item small {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.18em;
  color: var(--signal);
}

.timeline-item h3 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.timeline-item p {
  color: var(--paper-dim);
  font-size: 0.9375rem;
}

.timeline-item:nth-child(2n) {
  background: var(--ink-soft);
}

/* --- 7. Message (03) --------------------------------------------------- */

.message {
  position: relative;
  max-width: 52rem;
  padding: clamp(1.75rem, 4vw, 3rem) clamp(1.5rem, 4vw, 3rem) clamp(1.5rem, 3vw, 2.25rem);
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 2px solid var(--signal);
  box-shadow: var(--instrument-shadow);
}

.message-index {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: clamp(1rem, 2vw, 1.5rem);
}

.message-text {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 2.75rem);
  font-weight: 900;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.message-from {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.message-name {
  font-weight: 700;
  letter-spacing: 0.12em;
}

.message-name::before {
  content: "— ";
  color: var(--signal);
}

.message-meta {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

/* --- 8. Wish list (04) -------------------------------------------------- */

.wish-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 24rem), 1fr));
  border-top: 1px solid var(--line);
}

.wish-list li {
  display: flex;
  align-items: baseline;
  gap: 1.1rem;
  padding: 0.95rem 0.5rem;
  border-bottom: 1px solid var(--line);
  font-size: 1rem;
  color: var(--paper-dim);
  transition: color var(--dur-direct) var(--ease), padding-left var(--dur-direct) var(--ease);
}

.wish-list li:nth-child(odd) {
  padding-right: 2rem;
}

.wish-list li span {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--muted);
  flex: 0 0 auto;
}

.wish-list li:hover {
  color: var(--paper);
  padding-left: 1.1rem;
}

.wish-list li:hover span {
  color: var(--signal);
}

/* --- 9. Candles (05) ---------------------------------------------------- */

.cake-stage {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(18rem, 0.6fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: end;
}

.cake {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: center;
  gap: 0;
  padding: clamp(2rem, 5vw, 4rem) 0 0;
  border: 1px solid var(--line);
  background: radial-gradient(120% 80% at 50% 12%, rgba(243, 255, 0, 0.06), transparent 62%),
    linear-gradient(180deg, rgba(16, 16, 16, 0.9), rgba(5, 5, 5, 0.9));
  min-height: 22rem;
}

.candles {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: clamp(2px, 0.85vw, 12px);
  padding: 0 0.75rem 0.25rem;
  width: 100%;
}

/* 蜡烛等分可用宽度，最多 22px：18 支在任何屏宽下都落在蛋糕之内 */
.candle {
  position: relative;
  flex: 1 1 0;
  width: auto;
  min-width: 0;
  max-width: 22px;
  height: 5.25rem;
  background: linear-gradient(180deg, rgba(243, 243, 243, 0.9), rgba(243, 243, 243, 0.42));
  border: 1px solid transparent;
  padding: 0;
  transition: transform var(--dur-direct) var(--ease), background var(--dur-direct) var(--ease);
}

.candle::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: calc(100% + 4px);
  width: 0.55rem;
  height: 1.05rem;
  transform: translateX(-50%) scale(1);
  transform-origin: bottom center;
  background: radial-gradient(circle at 50% 68%, #ffffff 0%, var(--signal) 52%, rgba(243, 255, 0, 0) 74%);
  border-radius: 50% 50% 45% 45%;
  filter: drop-shadow(0 0 8px rgba(243, 255, 0, 0.65));
  opacity: 1;
  transition: opacity 320ms var(--ease), transform 320ms var(--ease);
  animation: flicker 1.8s var(--ease) infinite;
}

/* 熄灭时升起的一缕烟 */
.candle::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: calc(100% + 7px);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(243, 243, 243, 0.8), rgba(243, 243, 243, 0) 70%);
  opacity: 0;
  transform: translate(-50%, 4px) scale(0.45);
  pointer-events: none;
}

.candle.is-puff::before {
  animation: puff 900ms var(--ease) forwards;
}

@keyframes puff {
  0% {
    opacity: 0.85;
    transform: translate(-50%, 0) scale(0.45);
  }
  55% {
    opacity: 0.45;
    transform: translate(-50%, -20px) scale(1.1);
  }
  100% {
    opacity: 0;
    transform: translate(-60%, -46px) scale(2);
  }
}

@keyframes flicker {
  0%,
  100% {
    transform: translateX(-50%) scale(1) rotate(0deg);
  }
  40% {
    transform: translateX(-52%) scale(1.06, 0.94) rotate(-2deg);
  }
  70% {
    transform: translateX(-48%) scale(0.94, 1.06) rotate(2deg);
  }
}

.candle.is-out {
  background: rgba(243, 243, 243, 0.16);
}

.candle.is-out::after {
  opacity: 0;
  transform: translateX(-50%) scale(0.18) translateY(3px);
  animation: none;
}

/* 吹灭时横扫整排蜡烛的一道光，作为“吹气”的动作反馈 */
.candles {
  position: relative;
}

.candles::after {
  content: "";
  position: absolute;
  left: -4%;
  right: -4%;
  top: -0.9rem;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--signal), transparent);
  opacity: 0;
  pointer-events: none;
}

.candles.is-gust::after {
  animation: gust 760ms var(--ease);
}

@keyframes gust {
  0% {
    opacity: 0;
    transform: translateX(-42%) scaleX(0.25);
  }
  30% {
    opacity: 0.95;
  }
  100% {
    opacity: 0;
    transform: translateX(6%) scaleX(1);
  }
}

.candle:hover {
  transform: translateY(-3px);
}

.candle:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

/* varied candle heights (no inline styles: CSP-safe) */
.candle:nth-child(3n) {
  height: 4.5rem;
}

.candle:nth-child(4n) {
  height: 6rem;
}

.candle:nth-child(7n) {
  height: 5.75rem;
}

.cake-body {
  position: relative;
  width: min(100%, 34rem);
  height: 9rem;
  margin-top: -2px;
}

.cake-tier {
  position: absolute;
  inset: auto 0 0 0;
  height: 7.25rem;
  background: linear-gradient(180deg, #1c1c1c 0%, #0d0d0d 100%);
  border: 1px solid var(--line-strong);
}

.cake-tier::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 2.5rem 100%;
  opacity: 0.5;
}

.cake-frosting {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 7.25rem;
  height: 1.1rem;
  background: var(--signal);
  clip-path: polygon(
    0 0,
    100% 0,
    100% 45%,
    93.75% 100%,
    87.5% 45%,
    81.25% 100%,
    75% 45%,
    68.75% 100%,
    62.5% 45%,
    56.25% 100%,
    50% 45%,
    43.75% 100%,
    37.5% 45%,
    31.25% 100%,
    25% 45%,
    18.75% 100%,
    12.5% 45%,
    6.25% 100%,
    0 45%
  );
}

.cake-plate {
  position: absolute;
  left: -1.5rem;
  right: -1.5rem;
  bottom: -0.55rem;
  height: 0.55rem;
  background: rgba(243, 243, 243, 0.22);
}

.cake-panel {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  padding: 1.5rem;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--instrument-shadow);
}

.cake-panel .actions {
  flex-direction: column;
  align-items: stretch;
}

.cake-panel .btn {
  justify-content: flex-start;
}

.cake-status {
  font-size: 1rem;
  color: var(--paper);
}

.cake-progress {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.cake-progress-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.cake-progress-label b {
  color: var(--signal);
}

.cake-progress-bar {
  display: block;
  height: 4px;
  background: rgba(243, 243, 243, 0.14);
  overflow: hidden;
}

.cake-progress-bar i {
  display: block;
  height: 100%;
  width: 100%;
  background: var(--signal);
  transform-origin: left center;
  transition: transform var(--dur-reveal) var(--ease);
}

.cake-result {
  padding: 0.9rem 1rem;
  border-left: 2px solid var(--signal);
  background: rgba(243, 255, 0, 0.08);
  font-weight: 600;
  letter-spacing: 0.04em;
}

.cake-result[hidden] {
  display: none;
}

.cake-note {
  font-size: 0.8125rem;
  color: var(--muted);
}

/* --- 10. Colophon + footer --------------------------------------------- */

/* 站点署名：位于最后一节横线之下、页脚之上，白色低对比、不加章节标题 */
.colophon {
  grid-column: 2;
  grid-row: 3;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: clamp(1.35rem, 2.6vw, 2rem) var(--gutter) clamp(1.5rem, 2.8vw, 2.25rem);
}

.colophon-line {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  line-height: 1.95;
  letter-spacing: 0.06em;
  color: rgba(243, 243, 243, 0.46);
}

.colophon-link {
  color: inherit;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-direct) var(--ease), border-color var(--dur-direct) var(--ease);
}

.colophon-link:hover,
.colophon-link:focus-visible {
  color: rgba(243, 243, 243, 0.82);
  border-bottom-color: currentColor;
}

.footer {
  grid-column: 2;
  grid-row: 4;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto;
  gap: 1.5rem;
  align-items: center;
  padding: clamp(2rem, 4vw, 3rem) var(--gutter);
  border-top: 1px solid var(--line);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.footer-brand p {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.footer-brand strong {
  letter-spacing: 0.14em;
}

.footer-meta {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.footer-credit {
  color: var(--paper-dim);
}

.footer-credit::before {
  content: "◆ ";
  color: var(--signal);
}

.footer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: flex-end;
}

.footer-note {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--signal);
  min-height: 1.2em;
}

/* --- 11. Confetti ------------------------------------------------------- */

.confetti {
  position: fixed;
  inset: 0;
  z-index: 50;
  pointer-events: none;
  overflow: hidden;
}

.confetti i {
  position: absolute;
  top: -1.5rem;
  width: 8px;
  height: 14px;
  background: var(--signal);
  opacity: 0;
  animation: drop 1.9s var(--ease) forwards;
}

.confetti i:nth-child(3n) {
  background: var(--paper);
}

.confetti i:nth-child(4n) {
  height: 8px;
  width: 8px;
}

.confetti i:nth-child(1) { left: 8%; animation-delay: 0ms; }
.confetti i:nth-child(2) { left: 16%; animation-delay: 120ms; }
.confetti i:nth-child(3) { left: 24%; animation-delay: 60ms; }
.confetti i:nth-child(4) { left: 33%; animation-delay: 200ms; }
.confetti i:nth-child(5) { left: 41%; animation-delay: 30ms; }
.confetti i:nth-child(6) { left: 50%; animation-delay: 170ms; }
.confetti i:nth-child(7) { left: 58%; animation-delay: 90ms; }
.confetti i:nth-child(8) { left: 66%; animation-delay: 230ms; }
.confetti i:nth-child(9) { left: 74%; animation-delay: 45ms; }
.confetti i:nth-child(10) { left: 82%; animation-delay: 150ms; }
.confetti i:nth-child(11) { left: 89%; animation-delay: 75ms; }
.confetti i:nth-child(12) { left: 95%; animation-delay: 190ms; }

@keyframes drop {
  0% {
    opacity: 1;
    transform: translateY(0) rotate(0deg);
  }
  100% {
    opacity: 0;
    transform: translateY(112svh) rotate(420deg);
  }
}

/* --- 12. Scroll hint (portrait) ----------------------------------------- */

.scroll-hint {
  display: none;
}

@media (max-width: 900px), (orientation: portrait) {
  .scroll-hint {
    position: fixed;
    right: clamp(0.9rem, 4vw, 1.75rem);
    bottom: calc(5.5rem + env(safe-area-inset-bottom));
    z-index: 30;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.6rem;
    pointer-events: none;
    opacity: 1;
    transition: opacity 420ms var(--ease), transform 420ms var(--ease);
  }

  .scroll-hint.is-hidden {
    opacity: 0;
    transform: translateY(10px);
  }

  /* 一层很轻的暗色晕染，保证提示叠在卡片上时依然清晰 */
  .scroll-hint::before {
    content: "";
    position: absolute;
    inset: -1rem -0.7rem;
    background: radial-gradient(58% 58% at 50% 58%, rgba(5, 5, 5, 0.78), transparent 74%);
    z-index: -1;
  }

  .scroll-hint-label {
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 0.5625rem;
    letter-spacing: 0.24em;
    color: var(--muted);
  }

  .scroll-hint-track {
    position: relative;
    display: block;
    width: 1px;
    height: 3.5rem;
    background: linear-gradient(180deg, transparent, rgba(243, 243, 243, 0.38));
  }

  .scroll-hint-track i {
    position: absolute;
    left: 50%;
    top: 0;
    width: 3px;
    height: 0.85rem;
    margin-left: -1.5px;
    background: var(--signal);
    box-shadow: 0 0 8px rgba(243, 255, 0, 0.55);
    animation: hintTravel 1.9s var(--ease) infinite;
  }

  .scroll-hint-track::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: -0.3rem;
    width: 0.4rem;
    height: 0.4rem;
    margin-left: -0.2rem;
    border-right: 1px solid rgba(243, 243, 243, 0.42);
    border-bottom: 1px solid rgba(243, 243, 243, 0.42);
    transform: rotate(45deg);
  }

  @keyframes hintTravel {
    0% {
      transform: translateY(-0.85rem);
      opacity: 0;
    }
    30%,
    70% {
      opacity: 1;
    }
    100% {
      transform: translateY(3.5rem);
      opacity: 0;
    }
  }
}

/* --- 13. Responsive ----------------------------------------------------- */

@media (max-width: 1180px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
  }

  .dossier {
    width: min(100%, 32rem);
  }

  .cake-stage {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .footer-meta {
    grid-column: 1 / -1;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.25rem 1.5rem;
  }
}

@media (max-width: 900px), (orientation: portrait) {
  .shell {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto minmax(0, 1fr) auto auto auto;
  }

  .topbar {
    position: static;
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
    padding: 0.85rem clamp(1rem, 4vw, 2rem);
  }

  .topbar-status {
    order: 3;
    width: 100%;
  }

  .topbar-nav {
    display: none;
  }

  .main {
    grid-column: 1;
    grid-row: 2;
  }

  .rail {
    grid-column: 1;
    grid-row: 5;
    position: sticky;
    bottom: 0;
    top: auto;
    height: auto;
    flex-direction: row;
    justify-content: center;
    border-right: 0;
    border-top: 1px solid var(--line);
    background: var(--panel);
    backdrop-filter: blur(14px);
    padding: 0.35rem 0.5rem calc(0.35rem + env(safe-area-inset-bottom));
    z-index: 45;
  }

  .rail-list {
    flex-direction: row;
    justify-content: space-between;
    gap: 0;
  }

  .rail-list li {
    flex: 1 1 0;
  }

  .rail-list small {
    display: none;
  }

  .rail-list a::before {
    left: 0;
    right: 0;
    top: 0;
    bottom: auto;
    width: auto;
    height: 2px;
    transform: scaleX(0);
    transform-origin: left;
  }

  .rail-list a[aria-current="true"]::before {
    transform: scaleX(1);
  }

  .rail-note {
    display: none;
  }

  .colophon {
    grid-column: 1;
    grid-row: 3;
  }

  .footer {
    grid-column: 1;
    grid-row: 4;
    padding-bottom: 1.5rem;
  }

  .hero {
    min-height: 0;
    padding-top: clamp(2.5rem, 9vw, 4.5rem);
  }

  .stage-art-grid {
    width: 74%;
    opacity: 0.6;
  }

  .stage-art-panel {
    display: none;
  }

  .chapter-track {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .chapter-track li:nth-child(3) {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .chapter-track li:nth-child(4) {
    border-top: 1px solid var(--line);
  }

  .chapter-track a {
    padding: 1rem 1.25rem 1.15rem;
  }

  .wish-list li:nth-child(odd) {
    padding-right: 0.5rem;
  }

  .candles {
    gap: clamp(2px, 0.7vw, 6px);
    padding-inline: 0.6rem;
  }

  .candle {
    height: 4.25rem;
  }

  .candle:nth-child(3n) { height: 3.5rem; }
  .candle:nth-child(4n) { height: 4.75rem; }
  .candle:nth-child(7n) { height: 4.5rem; }
}

@media (max-width: 520px) {
  .brand-text small {
    display: none;
  }

  .display {
    line-height: 1.02;
  }

  .hero-foot {
    font-size: 0.625rem;
    letter-spacing: 0.16em;
  }

  .wish-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .message-from {
    gap: 0.4rem;
  }

  .candle::after {
    width: 0.45rem;
    height: 0.85rem;
  }

  /* 首屏两枚按钮在窄屏铺满一行（不要作用到竖向排列的蜡烛面板） */
  .hero .actions .btn {
    flex: 1 1 12rem;
  }
}

/* --- 14. Reduced motion ------------------------------------------------- */

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  html.js [data-reveal] {
    clip-path: none;
    transform: none;
  }

  .confetti {
    display: none;
  }

  .scroll-hint-track i {
    animation: none;
    transform: translateY(1.35rem);
    opacity: 1;
  }
}

/* --- 15. Print ---------------------------------------------------------- */

@media print {
  body::before,
  .stage-art,
  .rail,
  .topbar,
  .confetti,
  .scroll-hint {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .shell {
    display: block;
  }
}