:root {
  color-scheme: light;
  --ink: #17332f;
  --ink-soft: #55706a;
  --green-950: #103c35;
  --green-800: #166052;
  --green-700: #1b7864;
  --green-500: #43a88c;
  --green-100: #dff3eb;
  --green-050: #eff9f5;
  --warm: #f5f2eb;
  --paper: #fffefa;
  --line: #dbe5e1;
  --shadow: 0 24px 70px rgba(22, 68, 58, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 12% 6%, rgba(145, 204, 185, 0.23), transparent 30rem),
    linear-gradient(180deg, #f8faf7 0, #f4f1ea 64%, #ecf5f0 100%);
  color: var(--ink);
  font-family:
    Inter, "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", Meiryo,
    system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

button,
input,
select {
  font: inherit;
}

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

.page-shell {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 78px;
}

.brand,
.github-link {
  color: var(--ink);
  text-decoration: none;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand-mark {
  position: relative;
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
}

.brand-mark span {
  position: absolute;
  width: 24px;
  height: 7px;
  border-radius: 999px;
  background: var(--green-700);
  box-shadow: 0 1px 2px rgba(11, 60, 50, 0.22);
}

.brand-mark span:nth-child(1) {
  transform: translateY(-7px) scaleX(0.72);
  opacity: 0.55;
}

.brand-mark span:nth-child(2) {
  transform: scaleX(0.88);
  opacity: 0.78;
}

.brand-mark span:nth-child(3) {
  transform: translateY(7px);
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--ink-soft);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.github-link:hover {
  color: var(--green-700);
}

.hero {
  padding: 72px 0 56px;
  text-align: center;
}

.eyebrow,
.section-kicker,
.step-heading p {
  margin: 0;
  color: var(--green-700);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  text-transform: uppercase;
}

.eyebrow span {
  width: 24px;
  height: 1px;
  background: var(--green-500);
}

.hero h1 {
  margin: 14px 0 14px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(4.1rem, 9vw, 7.3rem);
  font-weight: 400;
  letter-spacing: -0.07em;
  line-height: 0.92;
}

.hero h1 span {
  color: var(--green-700);
  font-style: italic;
}

.hero-copy {
  margin: 0;
  color: var(--ink-soft);
  font-size: clamp(1rem, 2vw, 1.22rem);
  line-height: 1.9;
}

.privacy-pill {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-top: 25px;
  padding: 10px 15px;
  border: 1px solid #c8e3d8;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  color: var(--ink-soft);
  font-size: 0.78rem;
  backdrop-filter: blur(8px);
}

.privacy-pill strong {
  color: var(--green-800);
}

.privacy-pill svg {
  width: 18px;
  fill: none;
  stroke: var(--green-700);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.workspace {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 58px);
  border: 1px solid rgba(213, 226, 221, 0.9);
  border-radius: 28px;
  background: rgba(255, 254, 250, 0.94);
  box-shadow: var(--shadow);
}

.workspace::before {
  position: absolute;
  top: -80px;
  right: -90px;
  width: 240px;
  height: 240px;
  border: 35px solid rgba(67, 168, 140, 0.05);
  border-radius: 50%;
  content: "";
}

.step-heading {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 23px;
}

.step-number {
  display: grid;
  flex: 0 0 42px;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid #bcd8ce;
  border-radius: 50%;
  color: var(--green-700);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.15rem;
}

.step-heading h2 {
  margin: 3px 0 0;
  font-size: 1.22rem;
  letter-spacing: -0.02em;
}

.drop-zone {
  position: relative;
  display: flex;
  min-height: 220px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 32px;
  border: 1.5px dashed #8bbcac;
  border-radius: 20px;
  background:
    repeating-linear-gradient(
      -45deg,
      rgba(231, 246, 240, 0.52),
      rgba(231, 246, 240, 0.52) 12px,
      rgba(255, 255, 255, 0.65) 12px,
      rgba(255, 255, 255, 0.65) 24px
    );
  cursor: pointer;
  transition:
    border-color 160ms ease,
    background-color 160ms ease,
    transform 160ms ease;
}

.drop-zone:hover,
.drop-zone.is-dragging {
  border-color: var(--green-700);
  background-color: var(--green-050);
  transform: translateY(-2px);
}

.drop-zone.is-loading {
  pointer-events: none;
  opacity: 0.62;
}

.drop-icon {
  display: grid;
  width: 62px;
  height: 62px;
  margin-bottom: 16px;
  place-items: center;
  border: 1px solid #cae4db;
  border-radius: 50%;
  background: var(--paper);
  box-shadow: 0 8px 26px rgba(27, 120, 100, 0.1);
}

.drop-icon svg {
  width: 32px;
  fill: none;
  stroke: var(--green-700);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.drop-title {
  font-size: 1.02rem;
  font-weight: 800;
}

.drop-subtitle {
  margin-top: 8px;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.file-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
}

.file-card-main {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--line);
}

.file-type {
  display: grid;
  flex: 0 0 44px;
  width: 44px;
  height: 50px;
  place-items: center;
  border-radius: 6px 12px 6px 6px;
  background: var(--green-100);
  color: var(--green-800);
  font-size: 0.7rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.file-name-wrap {
  display: flex;
  min-width: 0;
  flex: 1;
  flex-direction: column;
  gap: 5px;
}

.file-name-wrap strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-name-wrap span,
.field small,
.result-copy small {
  color: var(--ink-soft);
  font-size: 0.76rem;
}

.text-button {
  border: 0;
  background: transparent;
  color: var(--green-700);
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 800;
}

.metadata-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0;
  padding: 18px 20px;
  gap: 18px;
}

.metadata-grid div:not(:first-child) {
  padding-left: 18px;
  border-left: 1px solid var(--line);
}

.metadata-grid dt {
  color: var(--ink-soft);
  font-size: 0.68rem;
  font-weight: 700;
}

.metadata-grid dd {
  margin: 5px 0 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.83rem;
  font-weight: 750;
}

.settings {
  padding-top: 48px;
}

.settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.field-label {
  font-size: 0.83rem;
  font-weight: 800;
}

select,
.number-control {
  width: 100%;
  height: 50px;
  border: 1px solid #bfd2cc;
  border-radius: 11px;
  background: #fff;
}

select {
  padding: 0 14px;
  color: var(--ink);
  cursor: pointer;
}

.number-control {
  display: grid;
  grid-template-columns: 48px 1fr 48px;
  overflow: hidden;
}

.number-control button,
.number-control input {
  border: 0;
  background: #fff;
  color: var(--ink);
}

.number-control button {
  color: var(--green-700);
  cursor: pointer;
  font-size: 1.2rem;
}

.number-control button:hover {
  background: var(--green-050);
}

.number-control input {
  width: 100%;
  border-right: 1px solid var(--line);
  border-left: 1px solid var(--line);
  text-align: center;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-weight: 800;
  -moz-appearance: textfield;
}

.number-control input::-webkit-inner-spin-button,
.number-control input::-webkit-outer-spin-button {
  margin: 0;
  -webkit-appearance: none;
}

select:focus,
.number-control:focus-within {
  border-color: var(--green-500);
  outline: 3px solid rgba(67, 168, 140, 0.13);
}

.conversion-preview {
  display: grid;
  grid-template-columns: 1fr auto 1fr 1.35fr;
  align-items: center;
  margin-top: 24px;
  padding: 20px 22px;
  border: 1px solid #cce2d9;
  border-radius: 15px;
  background: var(--green-050);
  gap: 20px;
}

.conversion-preview > div {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.conversion-preview span {
  color: var(--ink-soft);
  font-size: 0.7rem;
  font-weight: 700;
}

.conversion-preview strong {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 1rem;
}

.conversion-arrow {
  color: var(--green-500) !important;
  font-size: 1.35rem !important;
}

.preview-output strong {
  color: var(--green-700);
}

.preview-detail {
  padding-left: 20px;
  border-left: 1px solid #c4ddd3;
}

.preview-detail span {
  line-height: 1.45;
}

.notice {
  margin-top: 16px;
  padding: 13px 15px;
  border-radius: 10px;
  font-size: 0.8rem;
  line-height: 1.55;
}

.warning {
  border: 1px solid #ecd49e;
  background: #fff9e9;
  color: #765b1d;
}

.primary-button {
  display: flex;
  width: 100%;
  min-height: 57px;
  align-items: center;
  justify-content: center;
  gap: 13px;
  margin-top: 24px;
  border: 0;
  border-radius: 13px;
  background: var(--green-950);
  color: #fff;
  box-shadow: 0 10px 22px rgba(16, 60, 53, 0.2);
  cursor: pointer;
  font-weight: 800;
  transition:
    background-color 160ms ease,
    transform 160ms ease;
}

.primary-button:hover {
  background: var(--green-800);
  transform: translateY(-1px);
}

.primary-button:disabled {
  cursor: wait;
  opacity: 0.6;
  transform: none;
}

.primary-button svg,
.download-button svg {
  width: 20px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.progress-panel {
  margin-top: 19px;
}

.progress-copy {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  color: var(--ink-soft);
  font-size: 0.75rem;
}

.progress-copy strong {
  color: var(--green-800);
}

.progress-track {
  overflow: hidden;
  height: 8px;
  border-radius: 999px;
  background: #e2ebe7;
}

.progress-track span {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--green-700), #66bea5);
  transition: width 180ms ease;
}

.result {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  margin-top: 26px;
  padding: 19px 20px;
  border: 1px solid #acd9c8;
  border-radius: 16px;
  background: #f0faf6;
  gap: 15px;
}

.result-check {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 50%;
  background: var(--green-700);
  color: white;
}

.result-check svg {
  width: 22px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.result-copy {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 3px;
}

.result-copy > span {
  color: var(--green-800);
  font-size: 0.72rem;
  font-weight: 800;
}

.result-copy strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.download-button {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  gap: 8px;
  padding: 0 15px;
  border: 1px solid #9fcdbc;
  border-radius: 9px;
  background: white;
  color: var(--green-800);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 800;
}

.download-button:hover {
  border-color: var(--green-700);
}

.slicer-guide {
  display: grid;
  grid-template-columns: 0.9fr 1.5fr;
  padding: 100px 8px 90px;
  gap: clamp(48px, 9vw, 110px);
}

.guide-intro h2 {
  margin: 8px 0 18px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.1rem, 4vw, 3rem);
  font-weight: 400;
  letter-spacing: -0.045em;
}

.guide-intro > p:last-child {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.85;
}

.guide-intro strong {
  color: var(--green-700);
}

.guide-steps {
  margin: 0;
  padding: 0;
  list-style: none;
}

.guide-steps li {
  display: grid;
  grid-template-columns: 42px 1fr;
  padding: 21px 0;
  border-bottom: 1px solid rgba(156, 187, 177, 0.45);
  gap: 16px;
}

.guide-steps li:first-child {
  padding-top: 0;
}

.guide-steps li > span {
  color: var(--green-500);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.95rem;
}

.guide-steps strong {
  font-size: 0.93rem;
}

.guide-steps p {
  margin: 6px 0 0;
  color: var(--ink-soft);
  font-size: 0.78rem;
  line-height: 1.6;
}

.guide-steps b {
  color: var(--green-800);
}

footer {
  display: flex;
  justify-content: space-between;
  padding: 28px 0 38px;
  border-top: 1px solid rgba(156, 187, 177, 0.48);
  color: var(--ink-soft);
  font-size: 0.72rem;
}

footer span:first-child {
  color: var(--ink);
  font-weight: 800;
}

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 10;
  max-width: min(420px, calc(100% - 48px));
  padding: 14px 17px;
  border: 1px solid #ebc8bf;
  border-radius: 11px;
  background: #fff8f6;
  color: #843d2c;
  box-shadow: 0 14px 40px rgba(66, 31, 22, 0.18);
  font-size: 0.83rem;
  line-height: 1.5;
}

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

[hidden] {
  display: none !important;
}

@media (max-width: 760px) {
  .page-shell {
    width: min(100% - 24px, 680px);
  }

  .site-header {
    height: 66px;
  }

  .hero {
    padding: 50px 0 42px;
  }

  .hero h1 {
    font-size: clamp(3rem, 14vw, 4.2rem);
  }

  .desktop-only {
    display: none;
  }

  .privacy-pill {
    align-items: flex-start;
    border-radius: 14px;
    text-align: left;
  }

  .workspace {
    border-radius: 21px;
  }

  .metadata-grid {
    grid-template-columns: 1fr 1fr;
  }

  .metadata-grid div:not(:first-child) {
    padding-left: 0;
    border-left: 0;
  }

  .metadata-grid div:nth-child(even) {
    padding-left: 18px;
    border-left: 1px solid var(--line);
  }

  .settings-grid {
    grid-template-columns: 1fr;
  }

  .conversion-preview {
    grid-template-columns: 1fr auto 1fr;
  }

  .preview-detail {
    grid-column: 1 / -1;
    padding: 14px 0 0;
    border-top: 1px solid #c4ddd3;
    border-left: 0;
  }

  .result {
    grid-template-columns: auto 1fr;
  }

  .download-button {
    grid-column: 1 / -1;
    justify-content: center;
  }

  .slicer-guide {
    grid-template-columns: 1fr;
    padding: 72px 5px 64px;
  }

  footer {
    flex-direction: column;
    gap: 8px;
  }
}

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