/*
 * 디자인 토큰. 색은 역할별로만 쓴다(primary = 잔디 초록 하나).
 * 대비(흰 surface 기준): text 15:1, muted 6.4:1, primary-strong 글자 5.5:1, primary 버튼 흰 글자 5.3:1.
 */
:root {
  --color-primary: #2f7a34;
  --color-primary-hover: #276a2c;
  --color-primary-strong: #256329;
  --color-primary-soft: #e8f3e8;
  --color-on-primary: #ffffff;
  --color-background: #f5f5f2;
  --color-surface: #ffffff;
  --color-surface-alt: #f0f0ec;
  --color-text: #1d1f23;
  --color-muted: #555b66;
  --color-border: #dcdcd6;
  --color-border-strong: #8a8f99;
  --color-success: #23672b;
  --color-warning: #8a5a00;
  --color-error: #b3261e;
  --color-error-soft: #fdecea;
  --color-focus: #3b5bdb;
  --color-check-a: #e6e6e1;
  --color-check-b: #f7f7f4;

  --spacing-2xs: 4px;
  --spacing-xs: 8px;
  --spacing-sm: 12px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 999px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", system-ui, sans-serif;
  --font-size-page-title: 28px;
  --font-size-section-title: 19px;
  --font-size-subheading: 16px;
  --font-size-body: 16px;
  --font-size-caption: 14px;
  --line-height-tight: 1.3;
  --line-height-body: 1.6;

  --touch-target: 44px;
  --duration-fast: 120ms;
  --duration-base: 200ms;
  --ease-out: cubic-bezier(.2, .7, .3, 1);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #4caf50;
    --color-primary-hover: #5cbf60;
    --color-primary-strong: #7fd283;
    --color-primary-soft: #1f2e20;
    --color-on-primary: #0d1a0e;
    --color-background: #141518;
    --color-surface: #1c1d21;
    --color-surface-alt: #25272c;
    --color-text: #ececee;
    --color-muted: #a7abb4;
    --color-border: #33353b;
    --color-border-strong: #6c707a;
    --color-success: #7fd283;
    --color-warning: #f0c060;
    --color-error: #ff8a80;
    --color-error-soft: #3a1f1e;
    --color-focus: #8ea8ff;
    --color-check-a: #26282d;
    --color-check-b: #2e3036;
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--color-background);
  color: var(--color-text);
  font: var(--font-size-body)/var(--line-height-body) var(--font-sans);
  word-break: keep-all;
  overflow-wrap: anywhere;
}
a { color: var(--color-primary-strong); text-underline-offset: 2px; }
p { margin: 0; }
:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 2px; }

.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: var(--spacing-md); top: -100px; z-index: 10;
  background: var(--color-surface); padding: var(--spacing-xs) var(--spacing-md); border-radius: var(--radius-sm);
}
.skip-link:focus { top: var(--spacing-md); }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 var(--spacing-md); }

/* ---------- header ---------- */
.site-header { padding: var(--spacing-xl) 0 var(--spacing-lg); }
.page-title { font-size: var(--font-size-page-title); line-height: var(--line-height-tight); margin: 0 0 var(--spacing-xs); letter-spacing: -0.01em; }
.page-desc { color: var(--color-muted); max-width: 60ch; }
.page-desc strong { color: var(--color-text); }

/* ---------- layout ---------- */
.layout {
  display: grid; gap: var(--spacing-md);
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas: "skin" "scene" "preview" "options";
}
.area-skin { grid-area: skin; }
.area-scene { grid-area: scene; }
.area-preview { grid-area: preview; }
.area-options { grid-area: options; }
@media (min-width: 1024px) {
  .layout {
    grid-template-columns: 360px minmax(0, 1fr);
    grid-template-areas: "skin preview" "scene preview" "options preview";
    align-items: start;
  }
  .area-preview { grid-row: 1 / span 3; position: sticky; top: var(--spacing-md); }
}

.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
}
@media (max-width: 480px) { .panel { padding: var(--spacing-md); } }

.section-title {
  display: flex; align-items: center; gap: var(--spacing-xs);
  font-size: var(--font-size-section-title); line-height: var(--line-height-tight); margin: 0 0 var(--spacing-md);
}
.step {
  display: inline-grid; place-items: center; width: 26px; height: 26px; flex: none;
  border-radius: var(--radius-full); background: var(--color-primary-soft); color: var(--color-primary-strong);
  font-size: var(--font-size-caption); font-weight: 700;
}
.optional { font-size: var(--font-size-caption); font-weight: 400; color: var(--color-muted); }
.subheading { font-size: var(--font-size-subheading); margin: var(--spacing-lg) 0 var(--spacing-sm); }
.section-head { display: flex; flex-wrap: wrap; gap: var(--spacing-sm); align-items: center; justify-content: space-between; margin-bottom: var(--spacing-md); }
.section-head .section-title { margin: 0; }

.helper { font-size: var(--font-size-caption); color: var(--color-muted); }
.error-text { font-size: var(--font-size-caption); color: var(--color-error); margin-top: var(--spacing-2xs); font-weight: 600; }

/* ---------- form controls ---------- */
.field-label { display: block; font-size: var(--font-size-caption); font-weight: 600; margin-bottom: var(--spacing-2xs); }
.input, .select {
  min-height: var(--touch-target); padding: 0 var(--spacing-sm);
  border: 1px solid var(--color-border-strong); border-radius: var(--radius-md);
  background: var(--color-surface); color: var(--color-text); font: inherit;
  transition: border-color var(--duration-fast);
}
.input:hover, .select:hover { border-color: var(--color-text); }
.input[aria-invalid="true"] { border-color: var(--color-error); background: var(--color-error-soft); }
.select { width: 100%; cursor: pointer; }
.select-sm { width: auto; min-height: 36px; font-size: var(--font-size-caption); }
.input-row { display: flex; gap: var(--spacing-xs); }
.input-row .input { flex: 1; min-width: 0; }
.name-form .helper { margin-top: var(--spacing-2xs); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--spacing-xs);
  min-height: var(--touch-target); padding: 0 var(--spacing-md);
  border-radius: var(--radius-md); border: 1px solid transparent;
  font: inherit; font-weight: 600; cursor: pointer; white-space: nowrap;
  transition: background-color var(--duration-fast), border-color var(--duration-fast), transform var(--duration-fast);
}
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled { cursor: not-allowed; opacity: .55; }
.btn-primary { background: var(--color-primary); color: var(--color-on-primary); }
.btn-primary:hover:not(:disabled) { background: var(--color-primary-hover); }
.btn-secondary { background: var(--color-surface); color: var(--color-text); border-color: var(--color-border-strong); }
.btn-secondary:hover:not(:disabled) { background: var(--color-surface-alt); }
.btn-ghost { background: transparent; color: var(--color-primary-strong); padding: 0 var(--spacing-xs); }
.btn-ghost:hover { background: var(--color-primary-soft); }
.btn-wide { width: 100%; }
.btn[aria-busy="true"]::before {
  content: ""; width: 14px; height: 14px; border-radius: 50%;
  border: 2px solid currentColor; border-right-color: transparent; animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.check { display: flex; align-items: center; gap: var(--spacing-xs); min-height: 36px; cursor: pointer; font-size: var(--font-size-body); }
.check input { width: 18px; height: 18px; margin: 0; accent-color: var(--color-primary); flex: none; cursor: pointer; }
.color-field { display: inline-flex; align-items: center; gap: var(--spacing-xs); font-size: var(--font-size-caption); color: var(--color-muted); min-height: 36px; cursor: pointer; }
.color-field input { width: 40px; height: 32px; padding: 2px; border: 1px solid var(--color-border-strong); border-radius: var(--radius-sm); background: var(--color-surface); cursor: pointer; }

.divider { display: flex; align-items: center; gap: var(--spacing-sm); margin: var(--spacing-md) 0; color: var(--color-muted); font-size: var(--font-size-caption); }
.divider::before, .divider::after { content: ""; flex: 1; height: 1px; background: var(--color-border); }

.dropzone {
  display: flex; flex-direction: column; align-items: center; gap: var(--spacing-2xs); text-align: center;
  padding: var(--spacing-md); border: 1.5px dashed var(--color-border-strong); border-radius: var(--radius-md);
  cursor: pointer; transition: background-color var(--duration-fast), border-color var(--duration-fast);
}
.dropzone:hover, .dropzone.is-over { background: var(--color-primary-soft); border-color: var(--color-primary); }
.dropzone:focus-within { outline: 3px solid var(--color-focus); outline-offset: 2px; }
.dropzone-title { font-weight: 600; color: var(--color-primary-strong); }

.skin-info { display: flex; align-items: center; gap: var(--spacing-sm); margin-top: var(--spacing-md); padding-top: var(--spacing-md); border-top: 1px solid var(--color-border); }
.skin-info canvas {
  width: 64px; height: 64px; flex: none; image-rendering: pixelated; border-radius: var(--radius-sm);
  background: repeating-conic-gradient(var(--color-check-a) 0 25%, var(--color-check-b) 0 50%) 0 0 / 8px 8px;
}
.skin-name { font-weight: 700; }

.status { margin-top: var(--spacing-sm); font-size: var(--font-size-caption); font-weight: 600; }
.status:empty { display: none; }
.status[data-tone="success"] { color: var(--color-success); }
.status[data-tone="error"] { color: var(--color-error); }
.status[data-tone="loading"] { color: var(--color-muted); }

/* ---------- options ---------- */
.options { display: grid; gap: var(--spacing-lg); }
fieldset { border: 0; padding: 0; margin: 0; min-width: 0; display: grid; gap: var(--spacing-xs); }
legend { font-size: var(--font-size-caption); font-weight: 700; color: var(--color-muted); padding: 0; margin-bottom: var(--spacing-xs); letter-spacing: .02em; }
.field { display: block; }
.field.inline { display: flex; align-items: center; justify-content: space-between; gap: var(--spacing-sm); flex-wrap: wrap; }
.field.range { display: grid; grid-template-columns: 1fr auto; align-items: center; }
.field.range .field-label { margin: 0; }
.field.range output { font-size: var(--font-size-caption); color: var(--color-muted); font-variant-numeric: tabular-nums; }
.field.range input { grid-column: 1 / -1; width: 100%; height: 32px; margin: 0; accent-color: var(--color-primary); cursor: pointer; }
.options .btn-ghost { justify-self: start; }

/* ---------- preview ---------- */
.segmented { display: inline-flex; padding: 3px; gap: 2px; background: var(--color-surface-alt); border-radius: var(--radius-md); }
.segmented label { position: relative; }
.segmented input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.segmented span {
  display: grid; place-items: center; min-height: 38px; padding: 0 var(--spacing-md);
  border-radius: var(--radius-sm); font-size: var(--font-size-caption); font-weight: 600; color: var(--color-muted);
  transition: background-color var(--duration-fast), color var(--duration-fast);
}
.segmented input:checked + span { background: var(--color-surface); color: var(--color-text); box-shadow: 0 1px 2px rgba(0, 0, 0, .12); }
.segmented input:focus-visible + span { outline: 3px solid var(--color-focus); outline-offset: 1px; }

.stage { position: relative; margin: 0; }
.stage canvas {
  display: block; width: 100%; height: auto; aspect-ratio: 8 / 5; border-radius: var(--radius-md);
  background: repeating-conic-gradient(var(--color-check-a) 0 25%, var(--color-check-b) 0 50%) 0 0 / 20px 20px;
  transition: transform 70ms var(--ease-out);
}
.stage-caption { margin-top: var(--spacing-xs); font-size: var(--font-size-caption); color: var(--color-muted); }
.empty-state {
  position: absolute; inset: 0; bottom: 30px; display: grid; place-content: center; gap: var(--spacing-2xs);
  text-align: center; padding: var(--spacing-lg);
}
.empty-title { font-weight: 700; font-size: var(--font-size-subheading); }
.empty-state[hidden] { display: none; }

.preview-tools { display: flex; flex-wrap: wrap; gap: var(--spacing-xs) var(--spacing-lg); margin-top: var(--spacing-xs); }

.results { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--spacing-sm); grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 600px) { .results { grid-template-columns: minmax(0, 1fr); } }
.result { display: flex; flex-direction: column; gap: var(--spacing-xs); }
.result canvas {
  display: block; width: 100%; height: auto; aspect-ratio: 8 / 5; border-radius: var(--radius-sm); border: 1px solid var(--color-border);
  background: repeating-conic-gradient(var(--color-check-a) 0 25%, var(--color-check-b) 0 50%) 0 0 / 12px 12px;
}
@media (max-width: 600px) {
  .result { display: grid; grid-template-columns: 120px 1fr; align-items: center; gap: var(--spacing-sm); }
  .result canvas { grid-row: span 2; }
}
.result-name { font-weight: 700; font-size: var(--font-size-caption); }
.result-name span { font-weight: 400; color: var(--color-muted); }
.result .btn { font-size: var(--font-size-caption); }

.download-all { margin-top: var(--spacing-md); display: grid; gap: var(--spacing-2xs); }

.howto { margin-top: var(--spacing-lg); border-top: 1px solid var(--color-border); padding-top: var(--spacing-md); }
.howto summary { cursor: pointer; font-weight: 600; min-height: var(--touch-target); display: flex; align-items: center; }
.howto ol { margin: var(--spacing-xs) 0 0; padding-left: 1.3em; color: var(--color-muted); display: grid; gap: var(--spacing-2xs); }
.howto strong, .howto em { color: var(--color-text); }

/* ---------- footer ---------- */
.site-footer { padding-top: var(--spacing-xl); padding-bottom: var(--spacing-2xl); font-size: var(--font-size-caption); color: var(--color-muted); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0ms !important; animation-duration: 0ms !important; }
}
.empty-state .btn { justify-self: center; margin-top: var(--spacing-xs); }
.howto summary { list-style: none; gap: var(--spacing-xs); }
.howto summary::-webkit-details-marker { display: none; }
.howto summary::before { content: "▸"; color: var(--color-muted); transition: transform var(--duration-base) var(--ease-out); }
.howto[open] summary::before { transform: rotate(90deg); }

/* ---------- 상호작용 고르기 ---------- */
.scene-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--spacing-xs); }
.scene-option { position: relative; display: block; cursor: pointer; }
.scene-option input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.scene-card {
  display: flex; flex-direction: column; gap: 2px; height: 100%; min-height: 64px;
  padding: var(--spacing-sm); border: 1.5px solid var(--color-border); border-radius: var(--radius-md);
  transition: border-color var(--duration-fast), background-color var(--duration-fast);
}
.scene-option:hover .scene-card { border-color: var(--color-border-strong); }
.scene-option input:checked + .scene-card { border-color: var(--color-primary); background: var(--color-primary-soft); }
.scene-option input:checked + .scene-card .scene-name::before { content: "✓ "; color: var(--color-primary-strong); }
.scene-option input:focus-visible + .scene-card { outline: 3px solid var(--color-focus); outline-offset: 2px; }
.scene-name { font-weight: 700; font-size: var(--font-size-caption); }
.scene-desc { font-size: 13px; color: var(--color-muted); line-height: var(--line-height-tight); }

/* ---------- 재생 도구 ---------- */
.preview-tools { align-items: center; }
.preview-tools .btn { min-width: 140px; }
.preview-tools .btn[aria-pressed="true"] { border-color: var(--color-primary); color: var(--color-primary-strong); background: var(--color-primary-soft); }
.inline-field { display: flex; align-items: center; gap: var(--spacing-xs); }
.inline-field .field-label { margin: 0; }
.prop-group { display: grid; gap: var(--spacing-xs); }

/* ---------- GIF ---------- */
.gif-box { margin-top: var(--spacing-lg); padding-top: var(--spacing-md); border-top: 1px solid var(--color-border); gap: var(--spacing-sm); }
.gif-box legend { float: left; width: 100%; font-size: var(--font-size-subheading); font-weight: 700; color: var(--color-text); letter-spacing: 0; margin-bottom: var(--spacing-2xs); padding: 0; }
.gif-row { display: flex; flex-wrap: wrap; align-items: flex-end; gap: var(--spacing-sm); }
.gif-row .field { flex: 1 1 140px; }
.gif-row .color-field { min-height: var(--touch-target); }