:root {
  --paper: oklch(93% 0.026 87);
  --paper-deep: oklch(87% 0.042 82);
  --ink: oklch(23% 0.026 58);
  --ink-soft: oklch(43% 0.025 63);
  --cinnabar: oklch(45% 0.15 29);
  --cinnabar-bright: oklch(52% 0.17 29);
  --line: color-mix(in oklch, var(--ink) 22%, transparent);
  --display: "FZKai-Z03", "Kaiti SC", "STKaiti", "LXGW WenKai", cursive;
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 88% 12%, color-mix(in oklch, var(--cinnabar) 9%, transparent), transparent 27rem),
    linear-gradient(105deg, transparent 0 71%, color-mix(in oklch, var(--ink) 4%, transparent) 71% 71.1%, transparent 71.1%),
    var(--paper);
}

button,
input {
  font: inherit;
}

button,
summary,
.drop-zone {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
summary:focus-visible,
input:focus-visible,
.drop-zone:focus-within {
  outline: 2px solid var(--cinnabar);
  outline-offset: 3px;
}

[hidden] {
  display: none !important;
}

.grain {
  position: fixed;
  z-index: -1;
  inset: 0;
  pointer-events: none;
  opacity: 0.19;
  background-image:
    repeating-linear-gradient(0deg, transparent 0 3px, color-mix(in oklch, var(--ink) 6%, transparent) 3px 4px),
    repeating-linear-gradient(90deg, transparent 0 7px, color-mix(in oklch, var(--paper-deep) 24%, transparent) 7px 8px);
  mix-blend-mode: multiply;
}

.site-header {
  position: relative;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  font-family: var(--display);
  font-size: 1.05rem;
  letter-spacing: 0.13em;
  text-decoration: none;
}

.brand-seal {
  display: grid;
  width: 34px;
  aspect-ratio: 1;
  place-items: center;
  border-radius: 2px;
  background: var(--cinnabar);
  color: var(--paper);
  font-size: 1.25rem;
  line-height: 1;
  transform: rotate(-2deg);
}

.admin-access {
  position: relative;
}

.admin-access summary {
  cursor: pointer;
  list-style: none;
  border-bottom: 1px solid currentColor;
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  line-height: 2;
  transition: color 180ms ease;
}

.admin-access summary::-webkit-details-marker {
  display: none;
}

.admin-access summary:hover {
  color: var(--cinnabar);
}

.admin-popover {
  position: absolute;
  top: calc(100% + 18px);
  right: 0;
  width: min(340px, calc(100vw - 32px));
  padding: 28px;
  border: 1px solid var(--line);
  background: color-mix(in oklch, var(--paper) 94%, white);
  box-shadow: 10px 14px 0 color-mix(in oklch, var(--ink) 9%, transparent);
}

.admin-popover::before {
  position: absolute;
  top: -7px;
  right: 18px;
  width: 12px;
  height: 12px;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: var(--paper);
  content: "";
  transform: rotate(45deg);
}

.admin-popover h2,
.download-dialog h2,
.upload-section h2 {
  margin: 4px 0 22px;
  font-family: var(--display);
  font-size: clamp(1.7rem, 4vw, 2.2rem);
  font-weight: 500;
}

.admin-popover label,
.dialog-shell label {
  display: grid;
  gap: 8px;
  margin-top: 16px;
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.admin-popover input,
.dialog-shell input {
  width: 100%;
  border: 0;
  border-bottom: 1px solid var(--ink);
  border-radius: 0;
  padding: 10px 2px;
  background: transparent;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  letter-spacing: normal;
}

main {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
}

.hero {
  min-height: 530px;
  padding: clamp(68px, 11vw, 138px) 0 76px;
}

.kicker,
.eyebrow {
  margin: 0;
  color: var(--cinnabar);
  font-family: var(--sans);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.26em;
}

.kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  animation: reveal 700ms 80ms both cubic-bezier(0.22, 1, 0.36, 1);
}

.kicker span {
  width: 42px;
  height: 1px;
  background: currentColor;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(210px, 1fr);
  align-items: end;
  gap: clamp(36px, 10vw, 140px);
  margin-top: 30px;
}

.hero h1 {
  margin: 0;
  max-width: 760px;
  font-family: var(--display);
  font-size: clamp(4.2rem, 10vw, 8.7rem);
  font-weight: 400;
  letter-spacing: -0.055em;
  line-height: 0.99;
  text-wrap: balance;
  animation: reveal 900ms 160ms both cubic-bezier(0.22, 1, 0.36, 1);
}

.hero-note {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 22px;
  padding-bottom: 12px;
  animation: reveal 800ms 300ms both cubic-bezier(0.22, 1, 0.36, 1);
}

.hero-note p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
  line-height: 1.9;
}

.vertical-mark {
  border-top: 3px solid var(--cinnabar);
  padding-top: 8px;
  color: var(--cinnabar);
  font-family: var(--display);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  writing-mode: vertical-rl;
}

.library {
  position: relative;
  padding: 58px 0 96px;
  border-top: 1px solid var(--ink);
}

.library::before {
  position: absolute;
  top: -4px;
  left: 0;
  width: 92px;
  height: 7px;
  background: var(--cinnabar);
  content: "";
}

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 34px;
}

.section-heading h2 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2rem, 5vw, 3.8rem);
  font-weight: 400;
}

.section-heading p {
  margin: 0;
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 0.74rem;
  letter-spacing: 0.11em;
}

.file-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: archive;
}

.file-item {
  counter-increment: archive;
  border-top: 1px solid var(--line);
  opacity: 0;
  transform: translateY(12px);
  animation: item-in 560ms calc(40ms * var(--i)) forwards cubic-bezier(0.22, 1, 0.36, 1);
}

.file-item:last-child {
  border-bottom: 1px solid var(--line);
}

.file-button {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr) 38px;
  align-items: center;
  width: 100%;
  min-height: 82px;
  border: 0;
  padding: 13px 4px;
  background: transparent;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.file-button::before {
  color: var(--cinnabar);
  content: counter(archive, decimal-leading-zero);
  font-family: var(--sans);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
}

.file-name {
  overflow-wrap: anywhere;
  font-size: clamp(1rem, 2vw, 1.22rem);
  line-height: 1.55;
  transition: transform 240ms cubic-bezier(0.22, 1, 0.36, 1);
}

.file-arrow {
  color: var(--cinnabar);
  font-family: var(--sans);
  font-size: 1.5rem;
  text-align: right;
  transition: transform 240ms cubic-bezier(0.22, 1, 0.36, 1);
}

.file-button:hover .file-name,
.file-button:focus-visible .file-name {
  transform: translateX(10px);
}

.file-button:hover .file-arrow,
.file-button:focus-visible .file-arrow {
  transform: translateX(4px);
}

.empty-state {
  margin: 42px 0;
  color: var(--ink-soft);
}

.upload-section {
  display: grid;
  grid-template-columns: minmax(220px, 0.8fr) minmax(360px, 1.2fr);
  gap: clamp(42px, 8vw, 120px);
  margin: 0 calc(50% - 50vw);
  padding: 74px max(24px, calc((100vw - 1180px) / 2));
  background: var(--ink);
  color: var(--paper);
}

.upload-section p:not(.eyebrow) {
  color: color-mix(in oklch, var(--paper) 72%, transparent);
  line-height: 1.8;
}

.upload-form {
  display: grid;
  gap: 16px;
}

.upload-form > input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.drop-zone {
  display: grid;
  min-height: 180px;
  place-items: center;
  align-content: center;
  gap: 6px;
  border: 1px dashed color-mix(in oklch, var(--paper) 42%, transparent);
  cursor: pointer;
  transition: border-color 180ms ease, background 180ms ease;
}

.drop-zone:hover,
.drop-zone.is-dragging {
  border-color: var(--paper);
  background: color-mix(in oklch, var(--paper) 7%, transparent);
}

.drop-zone > span:last-child {
  color: color-mix(in oklch, var(--paper) 60%, transparent);
  font-family: var(--sans);
  font-size: 0.78rem;
}

.drop-symbol {
  color: var(--cinnabar-bright);
  font-family: var(--sans);
  font-size: 2.5rem;
  font-weight: 200;
}

.button {
  min-height: 46px;
  border: 0;
  border-radius: 0;
  padding: 0 20px;
  cursor: pointer;
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  transition: filter 160ms ease, transform 160ms ease;
}

.button:hover {
  filter: brightness(1.09);
}

.button:active {
  transform: translateY(1px);
}

.button:disabled {
  cursor: wait;
  filter: grayscale(0.5);
  opacity: 0.62;
}

.button-dark {
  width: 100%;
  margin-top: 20px;
  background: var(--ink);
  color: var(--paper);
}

.button-red {
  background: var(--cinnabar);
  color: var(--paper);
}

.text-button {
  border: 0;
  border-bottom: 1px solid currentColor;
  padding: 0 0 3px;
  background: transparent;
  color: var(--cinnabar);
  cursor: pointer;
}

.form-error,
.form-status {
  min-height: 1.4em;
  margin: 12px 0 0;
  color: var(--cinnabar);
  font-family: var(--sans);
  font-size: 0.76rem;
  line-height: 1.5;
}

.upload-section .form-status {
  color: var(--paper-deep);
}

footer {
  display: flex;
  justify-content: space-between;
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 28px 0 38px;
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
}

.download-dialog {
  width: min(500px, calc(100% - 32px));
  max-width: none;
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--ink);
}

.download-dialog::backdrop {
  background: color-mix(in oklch, var(--ink) 72%, transparent);
  backdrop-filter: blur(3px);
}

.dialog-shell {
  position: relative;
  padding: clamp(32px, 8vw, 54px);
  border-top: 6px solid var(--cinnabar);
  background: var(--paper);
  box-shadow: 16px 18px 0 color-mix(in oklch, var(--ink) 22%, transparent);
}

.dialog-close {
  position: absolute;
  top: 16px;
  right: 18px;
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  font-family: var(--sans);
  font-size: 1.7rem;
  font-weight: 200;
}

.dialog-filename {
  margin: -10px 0 26px;
  color: var(--ink-soft);
  line-height: 1.65;
  overflow-wrap: anywhere;
}

.dialog-shell .button {
  width: 100%;
  margin-top: 10px;
}

.toast {
  position: fixed;
  z-index: 50;
  right: 24px;
  bottom: 24px;
  max-width: min(360px, calc(100% - 48px));
  padding: 13px 18px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--sans);
  font-size: 0.8rem;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 220ms ease, transform 220ms ease;
}

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

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

@keyframes item-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 720px) {
  .site-header,
  main,
  footer {
    width: min(100% - 32px, 1180px);
  }

  .site-header {
    padding: 17px 0;
  }

  .brand {
    font-size: 0.9rem;
  }

  .brand-seal {
    width: 30px;
  }

  .admin-popover {
    position: fixed;
    top: 72px;
    right: 16px;
  }

  .hero {
    min-height: 450px;
    padding: 72px 0 60px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 42px;
  }

  .hero h1 {
    font-size: clamp(3.65rem, 18vw, 6rem);
  }

  .hero-note {
    max-width: 310px;
    margin-left: auto;
  }

  .section-heading {
    align-items: flex-end;
  }

  .file-button {
    grid-template-columns: 42px minmax(0, 1fr) 28px;
    min-height: 74px;
  }

  .upload-section {
    grid-template-columns: 1fr;
    margin-inline: -16px;
    padding-inline: 24px;
  }

  footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 9px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}