:root {
  color-scheme: light;
  --color-primary: #2563eb;
  --color-primary-strong: #1d4ed8;
  --color-on-primary: #ffffff;
  --color-accent: #f2b84b;
  --color-on-accent: #172033;
  --color-background: #f7f9fd;
  --background-image-opacity: 0.12;
  --color-foreground: #142033;
  --color-card: #ffffff;
  --color-muted: #eef3fb;
  --color-muted-foreground: #475569;
  --color-border: #d1dbe9;
  --color-control: #8796aa;
  --color-danger: #b42318;
  --color-success: #176b50;
  --color-ring: #1d4ed8;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --motion: 180ms;
  font-family: Inter, "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --color-primary: #7db0ff;
    --color-primary-strong: #a7caff;
    --color-on-primary: #101a2a;
    --color-accent: #f4c466;
    --color-on-accent: #172033;
    --color-background: #101827;
    --background-image-opacity: 0.38;
    --color-foreground: #f1f5fb;
    --color-card: #192537;
    --color-muted: #223149;
    --color-muted-foreground: #c4cfdd;
    --color-border: #45566e;
    --color-control: #94a3b8;
    --color-danger: #ff938a;
    --color-success: #67d3a8;
    --color-ring: #9dc4ff;
  }
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

body {
  position: relative;
  isolation: isolate;
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--color-background);
  color: var(--color-foreground);
  padding: 0 0 env(safe-area-inset-bottom);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background: url("/images/file-transfer-background.png") center / cover no-repeat;
  opacity: var(--background-image-opacity);
  pointer-events: none;
}

button, input, select { font: inherit; color: inherit; }

button, a, label { -webkit-tap-highlight-color: transparent; }

:focus-visible {
  outline: 3px solid var(--color-ring);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: 1rem;
  top: 0.5rem;
  z-index: 20;
  transform: translateY(-160%);
  background: var(--color-card);
  color: var(--color-foreground);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: 0.5rem 0.75rem;
  text-decoration: none;
}

.skip:focus { transform: none; }

.top {
  width: min(78rem, calc(100% - 3rem));
  min-height: 5.5rem;
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 2rem;
  border-bottom: 1px solid var(--color-border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  min-height: 2.75rem;
  color: var(--color-foreground);
  text-decoration: none;
  flex: none;
}

.mark {
  width: 2rem;
  height: 2rem;
  fill: none;
  stroke: var(--color-primary);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.brand-word {
  display: grid;
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.brand-word span {
  margin-top: 0.2rem;
  color: var(--color-muted-foreground);
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.top-caption {
  flex: 1;
  margin: 0;
  color: var(--color-muted-foreground);
  font-size: 0.9rem;
}

.account { display: flex; align-items: center; gap: 0.75rem; }

.who { margin: 0; color: var(--color-muted-foreground); font-weight: 600; }

.page {
  width: min(78rem, calc(100% - 3rem));
  margin: 2.25rem auto 4rem;
}

.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  min-height: 20rem;
  padding: clamp(1.8rem, 4vw, 3.2rem);
  border: 1px solid #cfdbef;
  border-radius: 1.5rem;
  background: #eaf1ff;
}

.hero::before {
  content: "";
  position: absolute;
  inset-block: 0;
  right: 0;
  z-index: 0;
  width: 52%;
  background: url("/images/file-transfer-flow.png") right center / cover no-repeat;
  opacity: 0.16;
  pointer-events: none;
}

.hero-copy { position: relative; z-index: 1; max-width: 38rem; }

.hero-kicker, .eyebrow {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0 0 0.8rem;
  color: var(--color-primary-strong);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.hero-kicker span {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--color-accent);
}

.hero h1 {
  margin: 0;
  color: #142033;
  font-size: clamp(2.65rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.065em;
  text-wrap: balance;
}

.hero h1 span { color: #2459bb; }

.hero-description {
  max-width: 34rem;
  margin: 1.1rem 0 1.55rem;
  color: #40516a;
  font-size: 1rem;
  line-height: 1.7;
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1.2rem;
  margin: 0;
  padding: 0;
  list-style: none;
  color: #273b5b;
  font-size: 0.82rem;
  font-weight: 700;
}

.hero-points li { display: inline-flex; align-items: center; gap: 0.45rem; }

.point-mark {
  display: grid;
  place-items: center;
  width: 1.4rem;
  height: 1.4rem;
  border: 1px solid #b6c8e5;
  border-radius: 50%;
  color: #2256b1;
  font-size: 0.62rem;
  font-variant-numeric: tabular-nums;
}

.hero-visual { position: relative; z-index: 1; justify-self: center; width: min(100%, 22rem); height: 15rem; }

.visual-orbit {
  position: absolute;
  width: 15rem;
  height: 15rem;
  top: 1rem;
  right: 1rem;
  border: 1px solid #bfd0eb;
  border-radius: 50%;
}

.visual-file {
  position: absolute;
  width: 10rem;
  height: 12rem;
  border: 1px solid #9cb2d3;
  border-radius: 1rem;
}

.visual-file-back { top: 2rem; left: 3.5rem; transform: rotate(-9deg); background: #d5e2f7; }

.visual-file-front {
  top: 1.4rem;
  left: 4.3rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 1.15rem;
  background: #ffffff;
  transform: rotate(4deg);
}

.visual-file-front svg {
  width: 3.1rem;
  height: 3.1rem;
  fill: none;
  stroke: #2563eb;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.visual-file-label { margin-top: 0.75rem; color: #142033; font-size: 0.78rem; font-weight: 800; }
.visual-file-rule { width: 100%; margin: 0.65rem 0; border-top: 1px solid #d1dbe9; }
.visual-file-limit { color: #475569; font-size: 0.62rem; font-weight: 800; letter-spacing: 0.1em; }

.visual-code {
  position: absolute;
  right: 0;
  bottom: 0.45rem;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 0.15rem 0.55rem;
  min-width: 11rem;
  padding: 0.8rem 1rem;
  border: 1px solid #d1dbe9;
  border-radius: 0.9rem;
  background: #ffffff;
}

.visual-code > span:first-child { width: 0.55rem; height: 0.55rem; border-radius: 50%; background: #e7aa37; }
.visual-code > span:nth-child(2) { color: #475569; font-size: 0.65rem; font-weight: 700; }
.visual-code strong { grid-column: 2; color: #142033; font-size: 1.2rem; letter-spacing: 0.1em; font-variant-numeric: tabular-nums; }
.visual-spark { position: absolute; width: 0.65rem; height: 0.65rem; border: 2px solid #e7aa37; border-radius: 50%; }
.visual-spark-one { top: 1rem; left: 2rem; }
.visual-spark-two { right: 0.6rem; top: 4rem; width: 0.4rem; height: 0.4rem; background: #7fa8ed; border-color: #7fa8ed; }

.workflow-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin: 2.75rem 0 1.15rem;
}

.mobile-tabs { display: none; }

.workflow-heading .eyebrow { margin-bottom: 0.15rem; }
.workflow-heading h2 { margin: 0; font-size: 1.6rem; line-height: 1.25; letter-spacing: -0.04em; }
.workflow-heading > p { margin: 0 0 0.15rem; color: var(--color-muted-foreground); font-size: 0.9rem; }

.board { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(20rem, 0.92fr); align-items: start; gap: 1.2rem; }

.card, .sheet, dialog {
  border: 1px solid var(--color-border);
  border-radius: 1.25rem;
  background: var(--color-card);
  color: var(--color-foreground);
}

.card { min-width: 0; padding: clamp(1.2rem, 2.6vw, 1.8rem); }
.card-head { margin-bottom: 1.3rem; }
.card-title-row { display: flex; align-items: flex-start; gap: 0.9rem; }
.card-head h2 { margin: 0 0 0.25rem; font-size: 1.3rem; font-weight: 800; letter-spacing: -0.035em; }
.card-head p { margin: 0; color: var(--color-muted-foreground); font-size: 0.87rem; }

.step-index {
  display: grid;
  place-items: center;
  width: 2.35rem;
  height: 2.35rem;
  flex: none;
  border-radius: 0.75rem;
  background: #eaf1ff;
  color: #2459bb;
  font-size: 0.75rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.step-index-amber { background: #fff2d3; color: #815514; }

.stack, .field, .guest-note, .inbox, .auth { display: grid; gap: 0.75rem; }
.stack { gap: 1.1rem; }
.field { gap: 0.4rem; }
.field label, .modes legend { font-weight: 700; }
.optional { margin-left: 0.35rem; color: var(--color-muted-foreground); font-size: 0.78rem; font-weight: 500; }

input, select {
  width: 100%;
  min-height: 2.85rem;
  border: 1px solid var(--color-control);
  border-radius: 0.7rem;
  padding: 0.65rem 0.85rem;
  background: var(--color-card);
}

input::placeholder { color: #64748b; opacity: 1; }
input[aria-invalid="true"], select[aria-invalid="true"] { border-color: var(--color-danger); }
.hint, .meta, .note, .drop-hint, .who { margin: 0; color: var(--color-muted-foreground); }
.hint { font-size: 0.82rem; line-height: 1.5; }

.guest-note {
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1.1rem;
  padding: 0.85rem 1rem;
  border: 1px solid #bdd0f0;
  border-radius: 0.85rem;
  background: #f1f6ff;
}

.guest-note strong { display: block; color: #19488f; font-size: 0.88rem; }
.guest-note p { margin: 0.15rem 0 0; color: #40516a; font-size: 0.8rem; }

.modes { display: grid; gap: 0.6rem; margin: 0; padding: 0; border: 0; }
.modes legend { margin-bottom: 0.15rem; }

.choice {
  display: grid;
  grid-template-columns: 1.2rem minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.75rem;
  min-height: 4rem;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: 0.8rem;
  background: var(--color-card);
  cursor: pointer;
  transition: border-color var(--motion) ease, background-color var(--motion) ease;
}

.choice:has(input:checked) { border-color: var(--color-primary); background: #f2f6ff; }
.choice input { width: 1.1rem; height: 1.1rem; min-height: 0; margin: 0; accent-color: var(--color-primary); }
.choice-copy { display: grid; gap: 0.08rem; min-width: 0; }
.choice-copy strong { font-size: 0.9rem; line-height: 1.3; }
.choice-short { display: none; }
.choice-copy > span { color: var(--color-muted-foreground); font-size: 0.76rem; line-height: 1.35; }
.choice-tag { padding: 0.2rem 0.45rem; border-radius: 999px; background: var(--color-muted); color: var(--color-muted-foreground); font-size: 0.7rem; font-weight: 700; white-space: nowrap; }

.options { padding: 0.95rem; border-radius: 0.85rem; background: var(--color-muted); }
.options input, .options select { background: var(--color-card); }

.conversion-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.75rem; }
.conversion-grid .field { min-width: 0; }
.conversion-check { display: flex; align-items: center; gap: 0.6rem; font-size: 0.85rem; cursor: pointer; }
.conversion-check input { width: 1.1rem; height: 1.1rem; min-height: 0; margin: 0; accent-color: var(--color-primary); }
.prepared-preview { margin-top: 1.5rem; padding-top: 1.25rem; border-top: 1px solid var(--color-border); }
.prepared-preview h3 { margin: 0 0 0.5rem; font-size: 1.05rem; }
.prepared-preview > .hint { margin-bottom: 1rem; }
.preview-file { min-width: 0; padding-block: 0.8rem; border-bottom: 1px solid var(--color-border); }
.preview-file strong { display: block; overflow-wrap: anywhere; }
.preview-file .result-actions { margin-bottom: 0; }
.preview-media { display: block; width: 100%; max-height: 24rem; margin-top: 0.8rem; object-fit: contain; border: 0; background: var(--color-muted); }
iframe.preview-media { height: 24rem; }
.preview-text { max-height: 20rem; overflow: auto; white-space: pre-wrap; overflow-wrap: anywhere; font: inherit; font-size: 0.85rem; }

.drop {
  position: relative;
  display: grid;
  place-items: center;
  gap: 0.35rem;
  min-height: 9.5rem;
  padding: 1.2rem;
  border: 1.5px dashed #8ba2c1;
  border-radius: 0.9rem;
  background: #f7f9fd;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--motion) ease, background-color var(--motion) ease;
}

.drop input {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  min-height: 0;
  padding: 0;
  opacity: 0;
  cursor: pointer;
}

.drop:focus-within, .drop.over { border-color: var(--color-primary); background: #eef4ff; }
.drop:focus-within { outline: 3px solid var(--color-ring); outline-offset: 3px; }
.drop input:focus-visible { outline: none; }
.drop-icon { width: 2rem; height: 2rem; margin-bottom: 0.15rem; fill: none; stroke: var(--color-primary); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.drop-title { font-size: 0.95rem; font-weight: 800; }
.drop-hint { font-size: 0.78rem; }
.file-limit { margin: -0.45rem 0 0; color: var(--color-muted-foreground); font-size: 0.76rem; }

.picked-heading { color: var(--color-muted-foreground); font-size: 0.78rem; font-weight: 700; }
.picked, .files, .mine-list, .summary ul { display: grid; gap: 0.5rem; margin: 0; padding: 0; list-style: none; }
.picked-item, .files li, .mine-list li { display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; min-width: 0; padding: 0.7rem 0; border-bottom: 1px solid var(--color-border); }
.picked-item > div, .files li > div, .mine-list li > div { display: grid; min-width: 0; overflow-wrap: anywhere; }
.picked-name, .files strong, .mine-list strong { font-size: 0.85rem; font-weight: 700; }
.picked-size, .files li span { color: var(--color-muted-foreground); font-size: 0.76rem; }
.picked-remove { flex: none; min-height: 2.25rem; padding: 0.35rem 0.6rem; border: 1px solid var(--color-border); border-radius: 0.55rem; background: transparent; color: var(--color-muted-foreground); cursor: pointer; }
.picked-remove:hover { color: var(--color-foreground); background: var(--color-muted); }

.button, .files a, .icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.85rem;
  border: 1px solid var(--color-border);
  border-radius: 0.7rem;
  padding: 0.65rem 1rem;
  background: var(--color-card);
  color: var(--color-foreground);
  font-weight: 700;
  text-decoration: none;
  text-align: center;
  cursor: pointer;
  touch-action: manipulation;
  transition: background-color var(--motion) ease, border-color var(--motion) ease, color var(--motion) ease, opacity var(--motion) ease;
}

.button:hover, .files a:hover, .icon-button:hover { border-color: #9aabc2; background: var(--color-muted); }
.button.primary, .files a { border-color: var(--color-primary-strong); background: var(--color-primary); color: var(--color-on-primary); }
.button.primary:hover, .files a:hover { border-color: var(--color-primary-strong); background: var(--color-primary-strong); color: var(--color-on-primary); }
.button.secondary { border-color: #a9c1e9; background: #eaf1ff; color: #19488f; }
.button.secondary:hover { border-color: #7d9fdb; background: #dce8fb; }
.button.quiet { background: transparent; }
.button.danger { border-color: var(--color-danger); background: transparent; color: var(--color-danger); }
.button:active:not(:disabled), .files a:active, .icon-button:active { opacity: 0.82; }
.button:disabled { opacity: 0.48; cursor: not-allowed; }
.upload-action { width: 100%; min-height: 3.15rem; }
.icon-button { width: 2.85rem; padding: 0; flex: none; }
.icon-button svg { width: 1.25rem; height: 1.25rem; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }

.error { margin: 0; color: var(--color-danger); font-size: 0.83rem; font-weight: 700; }
.error:empty { display: none; }
.upload-status { min-height: 1.3rem; margin: -0.65rem 0 0; color: var(--color-muted-foreground); font-size: 0.8rem; }
.upload-status:empty { display: none; }
progress { width: 100%; height: 0.55rem; accent-color: var(--color-primary); }

.result { margin-top: 1rem; }
.share-result { padding: 1.1rem; border: 1px solid #bdd0f0; border-radius: 0.95rem; background: #f5f8ff; }
.share-result .eyebrow { margin-bottom: 0.25rem; }
.result-code { margin: 0.15rem 0 0.35rem; color: #19488f; font-size: clamp(2rem, 5vw, 2.7rem); letter-spacing: 0.1em; font-variant-numeric: tabular-nums; }
.result-message { margin: 0.35rem 0 0.7rem; color: var(--color-foreground); font-size: 0.88rem; font-weight: 600; }
.share-result .meta { font-size: 0.78rem; }
.result-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 0.75rem 0; }
.share-url { margin: 0 0 0.75rem; overflow-wrap: anywhere; font-size: 0.78rem; }
.share-url a { color: var(--color-primary-strong); }
.files { margin-top: 0.8rem; }
.files li { align-items: center; }
.files li > a { flex: none; min-width: 4.25rem; min-height: 2.5rem; padding: 0.4rem 0.75rem; font-size: 0.8rem; }
.files li > span.spent { color: var(--color-danger); font-weight: 700; }

.inbox {
  justify-items: start;
  gap: 0.7rem;
  margin-bottom: 1.2rem;
  padding: 1rem;
  border: 1px solid var(--color-border);
  border-radius: 0.9rem;
  background: var(--color-muted);
}

.inbox-copy strong { font-size: 0.9rem; }
.inbox-copy p { margin: 0.15rem 0 0; color: var(--color-muted-foreground); font-size: 0.8rem; }
.inbox-wait { width: 100%; padding-top: 0.8rem; border-top: 1px solid var(--color-border); }
.inbox-wait .code { margin: 0.2rem 0; color: var(--color-primary-strong); }
.status-line { margin-top: 0.65rem; font-size: 0.8rem; }
.receive-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 0.75rem; padding-top: 1.1rem; border-top: 1px solid var(--color-border); }
.receive-row:has(#receive-password-field:not([hidden])) { grid-template-columns: minmax(0, 1fr); }
.grow { min-width: 0; }

.code { margin: 0.25rem 0; font-size: 2.2rem; font-weight: 800; letter-spacing: 0.12em; font-variant-numeric: tabular-nums; }
.text-link { color: var(--color-primary-strong); font-weight: 700; text-underline-offset: 0.15em; }
.text-button { justify-self: start; min-height: 2.75rem; padding: 0.5rem 0; border: 0; background: transparent; color: var(--color-primary-strong); font-weight: 700; text-decoration: underline; text-underline-offset: 0.15em; cursor: pointer; }
.spent { color: var(--color-danger); font-weight: 700; }
.eyebrow { margin: 0 0 0.35rem; color: var(--color-muted-foreground); font-size: 0.75rem; font-weight: 800; letter-spacing: 0.05em; text-transform: uppercase; }

.mine { grid-column: 1 / -1; margin-top: 1.2rem; }
.mine-list { gap: 0; }
.mine-list li { min-height: 4rem; }
.mine-list li > div:first-child { flex: 1; }
.mine-list li > div:last-child { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.mine-list .button { min-height: 2.5rem; padding: 0.45rem 0.75rem; font-size: 0.8rem; }

.share-qr-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: fit-content;
  margin: 0.8rem 0;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 0.8rem;
  background: var(--color-card);
}
.share-qr-card figcaption { color: var(--color-muted-foreground); font-size: 0.8rem; font-weight: 700; }
.share-qr { display: block; width: 7rem; height: 7rem; padding: 0.25rem; border-radius: 0.55rem; background: #fff; }
.inbox-share { display: flex; align-items: center; gap: 0.75rem; }
.inbox-share .share-qr { width: 5.5rem; height: 5.5rem; }

.sheet { width: min(44rem, calc(100% - 2rem)); margin: 2rem auto 4rem; padding: clamp(1.25rem, 4vw, 2.5rem); }
.sheet h1 { margin: 0 0 0.8rem; font-size: 1.8rem; letter-spacing: -0.04em; }
.sheet .note { margin: 0.5rem 0; }
.sheet .meta { margin: 0.5rem 0 1rem; font-size: 0.85rem; }

.summary { padding: 0.85rem; border: 1px solid var(--color-danger); border-radius: 0.75rem; background: color-mix(in srgb, var(--color-danger) 9%, var(--color-card)); }
.summary p { margin: 0 0 0.4rem; font-weight: 800; }
.summary a { color: var(--color-danger); font-weight: 700; }

dialog {
  width: min(29rem, calc(100vw - 2rem));
  max-height: min(90dvh, 42rem);
  overflow: auto;
  padding: 0;
}

dialog::backdrop { background: rgba(12, 22, 38, 0.58); }
.auth { gap: 1rem; padding: clamp(1.2rem, 4vw, 1.7rem); }
.auth-bar { display: flex; align-items: flex-start; justify-content: space-between; gap: 0.75rem; }
.auth h2 { margin: 0 0 0.25rem; font-size: 1.45rem; letter-spacing: -0.04em; }
.auth-bar p { max-width: 21rem; }
.req { margin-left: 0.25rem; color: var(--color-danger); font-size: 0.8rem; font-weight: 700; }
.secret { display: flex; align-items: center; gap: 0.5rem; }
.secret input { flex: 1; }
.secret .button { flex: none; }

@media (prefers-color-scheme: dark) {
  .hero { border-color: #425674; background: #1a2a43; }
  .hero::before { opacity: 0.1; }
  .hero h1, .visual-file-label, .visual-code strong { color: #f1f5fb; }
  .hero h1 span { color: #9dc4ff; }
  .hero-description, .hero-points { color: #d6e0ef; }
  .point-mark, .visual-orbit { border-color: #506887; }
  .visual-file-back { border-color: #536d91; background: #314866; }
  .visual-file-front, .visual-code { border-color: #4c5f79; background: #202f45; }
  .visual-file-rule { border-color: #4c5f79; }
  .visual-code > span:nth-child(2), .visual-file-limit { color: #c4cfdd; }
  .guest-note { border-color: #435c7f; background: #21324d; }
  .guest-note strong { color: #c5dcff; }
  .guest-note p { color: #d0dbea; }
  .choice:has(input:checked) { background: #22344f; }
  .drop { border-color: #7186a3; background: #1d2b3f; }
  .drop:focus-within, .drop.over { background: #223a5b; }
  .button.secondary { border-color: #526d96; background: #263a58; color: #d7e6ff; }
  .button.secondary:hover { background: #314968; }
  .share-result { border-color: #435c7f; background: #1d2c42; }
  .result-code, .share-url a { color: #a7caff; }
  .inbox { background: #1d2b3f; }
  .inbox-wait { border-color: var(--color-border); }
  .share-qr-card { border-color: var(--color-border); background: var(--color-card); }
  input::placeholder { color: #bdc9d8; }
}

@media (max-width: 900px) {
  .page { margin-top: 1.5rem; }
  .hero { grid-template-columns: minmax(0, 1.2fr) minmax(14rem, 0.8fr); padding: 2.3rem; }
  .hero-visual { transform: scale(0.88); transform-origin: center right; }
  .board { grid-template-columns: minmax(0, 1fr) minmax(17rem, 0.9fr); }
}

@media (max-width: 720px) {
  body::before { background-position: 18% center; }
  .top, .page { width: min(100% - 2rem, 42rem); }
  .top { min-height: 4rem; gap: 1rem; }
  .top-caption { display: none; }
  .account { margin-left: auto; }
  .page { margin-top: 0.65rem; margin-bottom: 1.25rem; }
  .hero { display: block; min-height: 0; padding: 0.75rem 0.9rem; border-radius: 0.9rem; }
  .hero::before { width: 64%; opacity: 0.12; }
  .hero-kicker { margin-bottom: 0.15rem; font-size: 0.68rem; }
  .hero h1 { margin: 0.15rem 0 0.35rem; font-size: 1.3rem; line-height: 1.2; }
  .hero h1 br, .hero-description, .hero-visual { display: none; }
  .hero-points { display: flex; flex-wrap: wrap; gap: 0.3rem 0.4rem; margin: 0; padding: 0; list-style: none; }
  .hero-points li { gap: 0; padding: 0.12rem 0.42rem; border: 1px solid var(--color-border); border-radius: 999px; font-size: 0.65rem; }
  .hero-points .point-mark { display: none; }
  .mobile-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 0.25rem; margin: 0.55rem 0; padding: 0.25rem; border: 1px solid var(--color-border); border-radius: 0.85rem; background: var(--color-muted); }
  .mobile-tabs button { min-height: 2.75rem; border: 0; border-radius: 0.6rem; background: transparent; color: var(--color-muted-foreground); font: inherit; font-weight: 800; cursor: pointer; }
  .mobile-tabs button[aria-pressed="true"] { background: var(--color-card); color: var(--color-primary-strong); box-shadow: 0 0 0 1px var(--color-border); }
  .workflow-heading { display: none; }
  .board { display: block; }
  .board[data-mobile-view="send"] .receive-card, .board[data-mobile-view="receive"] .send-card { display: none; }
  .board .card { padding: 0.8rem; border-radius: 0.95rem; }
  .card-head { margin-bottom: 0.6rem; }
  .card-title-row { align-items: center; gap: 0.55rem; }
  .step-index, .card-head p { display: none; }
  .card-head h2 { margin: 0; font-size: 1.05rem; }
  .guest-note { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; padding: 0.45rem 0.6rem; }
  .guest-note strong { font-size: 0.77rem; }
  .guest-note p { display: none; }
  .guest-note .button { min-height: 2.35rem; padding: 0.4rem 0.55rem; font-size: 0.75rem; }
  #send-form { gap: 0.55rem; }
  .modes { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.4rem; }
  .choice { min-height: 3.25rem; padding: 0.45rem; }
  .choice-copy > span { display: none; }
  .choice-long { display: none; }
  .choice-short { display: inline; }
  .choice-tag { display: none; }
  #note-field, #file-limit { display: none; }
  .drop { min-height: 5rem; padding: 0.6rem; gap: 0.15rem; }
  .drop-icon { width: 1.5rem; height: 1.5rem; margin: 0; }
  .drop-title { font-size: 0.84rem; }
  .drop-hint { display: none; }
  .upload-action { min-height: 3rem; }
  .picked { max-height: 5rem; overflow: auto; }
  .inbox { gap: 0.5rem; padding: 0.65rem; }
  .inbox-copy strong { font-size: 0.82rem; }
  .inbox-copy p, .receive-row .hint { display: none; }
  .receive-row { grid-template-columns: 1fr; gap: 0.5rem; padding-top: 0.65rem; }
  .receive-row .button { width: 100%; }
  .mine { grid-column: auto; }
}

@media (max-width: 480px) {
  .top, .page { width: calc(100% - 1.25rem); }
  .top { min-height: 3.75rem; }
  .brand-word { font-size: 1.2rem; }
  .mark { width: 1.8rem; height: 1.8rem; }
  .page { margin-top: 0.55rem; margin-bottom: 1rem; }
  .hero { padding: 0.7rem 0.8rem; border-radius: 0.85rem; }
  .hero h1 { font-size: 1.22rem; }
  .hero-points { gap: 0.25rem; }
  .hero-points li { font-size: 0.62rem; }
  .mobile-tabs { margin-block: 0.45rem; }
  .card { padding: 0.75rem; border-radius: 0.9rem; }
  .card-head { margin-bottom: 0.5rem; }
  .card-head h2 { font-size: 1.02rem; }
  .choice { grid-template-columns: 1.1rem minmax(0, 1fr) auto; gap: 0.45rem; min-height: 3rem; padding: 0.4rem; }
  .choice-copy strong { font-size: 0.82rem; }
  .choice-copy > span { font-size: 0.7rem; }
  .choice-tag { font-size: 0.65rem; }
  .receive-row { grid-template-columns: 1fr; }
  .receive-row .button { width: 100%; }
  .guest-note { grid-template-columns: 1fr auto; }
  .guest-note .button { justify-self: start; }
  .picked-item, .files li, .mine-list li { align-items: flex-start; }
  .mine-list li { flex-wrap: wrap; }
  .mine-list li > div:last-child { width: 100%; }
  .mine-list li > div:last-child .button { flex: 1; }
  .result-code { font-size: 2.15rem; }
}

@media (max-width: 420px) and (max-height: 720px) {
  .board .card { padding: 0.65rem; }
  .inbox { gap: 0.35rem; padding: 0.45rem; }
  .receive-row { gap: 0.4rem; padding-top: 0.5rem; }
  .hero-points li:nth-child(n + 2) { display: none; }
  #send-guest { display: none; }
  .guest-note { padding: 0.3rem 0.5rem; }
  .guest-note .button { display: none; }
  #send-form { gap: 0.4rem; }
  .modes { gap: 0.3rem; }
  #code-options { gap: 0.25rem; padding: 0.4rem 0.5rem; }
  #code-options .field { grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: 0.45rem; }
  #code-options .field label { white-space: nowrap; font-size: 0.78rem; }
  #target-code-hint { display: none; }
  .choice { min-height: 2.85rem; padding: 0.32rem; }
  .choice-copy strong { font-size: 0.77rem; line-height: 1.15; }
  .drop { min-height: 4rem; padding: 0.4rem; }
  .upload-action { min-height: 2.8rem; }
  #picked { order: 1; }
}

@media (max-width: 720px) and (prefers-color-scheme: dark) {
  .hero::before { opacity: 0.1; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}