:root {
  --bg: #f6f8ff;
  --bg-card: #ffffff;
  --primary: #4c8dff;
  --primary-soft: #dbe8ff;
  --primary-dark: #2a6bd9;
  --pink: #ffd1e0;
  --pink-strong: #ff7eb6;
  --green: #d4f5d8;
  --green-strong: #4caf50;
  --yellow: #fff3c2;
  --yellow-strong: #ffc94c;
  --danger: #ff5e7a;
  --danger-soft: #ffe1e7;
  --text: #1f2a44;
  --text-soft: #5a6685;
  --line: #e3e8f5;
  --shadow: 0 6px 20px rgba(76, 141, 255, 0.12);
  --shadow-soft: 0 3px 10px rgba(76, 141, 255, 0.08);
  --radius-lg: 22px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --footer-h: 40px;
  --topbar-h: 60px;
  --font-pixel: 'Press Start 2P', monospace;
  --font-body: 'Pretendard GOV', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, #e3edff 0%, transparent 60%),
    radial-gradient(1000px 500px at 110% 10%, #ffe6f1 0%, transparent 55%),
    var(--bg);
  min-height: 100dvh;
  -webkit-tap-highlight-color: transparent;
  overflow-x: hidden;
}

button { font-family: inherit; }

/* ===== 스크린 공통 ===== */
.screen { display: none; }
.screen.active { display: block; }

/* 스플래시 (1, 2단계) — body가 footer 공간 확보 */
body { padding-bottom: var(--footer-h); }
#screen-ratio.active,
#screen-size.active { min-height: calc(100dvh - var(--footer-h)); }

#screen-ratio .screen-inner,
#screen-size .screen-inner {
  max-width: 920px;
  margin: 0 auto;
  padding: 44px 20px 28px;
  text-align: center;
}

.brand {
  font-family: var(--font-pixel);
  font-size: clamp(22px, 4.5vw, 42px);
  letter-spacing: 2px;
  line-height: 1.4;
  margin: 0;
  background: linear-gradient(135deg, #4c8dff 0%, #ff7eb6 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.brand-sub {
  font-size: clamp(14px, 3vw, 17px);
  color: var(--text-soft);
  margin: 6px 0 26px;
  font-weight: 500;
}
.screen-title {
  font-size: clamp(18px, 4vw, 22px);
  margin: 0 0 20px;
  font-weight: 700;
}

/* 토피바의 작은 브랜드: 픽셀 폰트 소형 */
.brand-small {
  font-family: var(--font-pixel);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 1px;
  margin: 0 0 0 4px;
  background: linear-gradient(135deg, #4c8dff 0%, #ff7eb6 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}

/* ===== 선택 카드 ===== */
.choice-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
@media (max-width: 720px) {
  .choice-grid { grid-template-columns: 1fr; gap: 14px; }
}
.choice-card {
  background: var(--bg-card);
  border: 3px solid transparent;
  border-radius: var(--radius-lg);
  padding: 22px 18px;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.choice-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: 0 10px 24px rgba(76, 141, 255, 0.22);
}
.choice-preview {
  background: repeating-conic-gradient(#eef3ff 0% 25%, #fff 0% 50%) 50% / 14px 14px;
  border: 2px dashed var(--primary-soft);
  border-radius: 14px;
}
.preview-landscape { width: 160px; height: 100px; }
.preview-square    { width: 130px; height: 130px; }
.preview-portrait  { width: 100px; height: 160px; }

.choice-preview-size {
  width: 130px;
  height: 130px;
  border-radius: 14px;
  border: 2px solid var(--primary-soft);
  background-color: #fff;
}
.size-small  { background-image: linear-gradient(#dbe8ff 1px, transparent 1px), linear-gradient(90deg, #dbe8ff 1px, transparent 1px); background-size: 26px 26px; }
.size-medium { background-image: linear-gradient(#dbe8ff 1px, transparent 1px), linear-gradient(90deg, #dbe8ff 1px, transparent 1px); background-size: 16px 16px; }
.size-large  { background-image: linear-gradient(#dbe8ff 1px, transparent 1px), linear-gradient(90deg, #dbe8ff 1px, transparent 1px); background-size: 9px 9px; }

.choice-label {
  font-weight: 700;
  font-size: 17px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.choice-desc { font-size: 14px; color: var(--text-soft); }
.btn-back { margin-top: 22px; }

/* ===== 기본 버튼 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 16px;
  border-radius: 999px;
  border: none;
  font-weight: 700;
  cursor: pointer;
  font-size: 14px;
  transition: transform .12s ease, background .15s ease, box-shadow .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn .material-icons { font-size: 18px; }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 12px rgba(76, 141, 255, 0.4); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost  { background: transparent; color: var(--text); border: 2px solid var(--line); }
.btn-ghost:hover { background: #f0f4ff; }
.btn-small { font-size: 12px; padding: 8px 12px; }

/* ===== 에디터: 뷰포트 고정 풀-스크린 레이아웃 ===== */
#screen-editor.active {
  display: flex;
  flex-direction: column;
  height: calc(100dvh - var(--footer-h));
  overflow: hidden;
}

/* 토피바 */
.topbar {
  position: relative;
  z-index: 50;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  min-height: var(--topbar-h);
  flex-shrink: 0;
}
.topbar-left, .topbar-right { display: flex; gap: 6px; align-items: center; }
.history-group { display: flex; gap: 4px; padding: 0 6px; border-left: 1px solid var(--line); border-right: 1px solid var(--line); }

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: var(--primary-soft);
  color: var(--primary-dark);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background .15s ease, transform .12s ease, opacity .15s ease;
  flex-shrink: 0;
}
.icon-btn:hover:not(:disabled) { background: #c8daff; }
.icon-btn:active:not(:disabled) { transform: scale(0.95); }
.icon-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.icon-btn.icon-btn-secondary { background: #eef1f8; color: var(--text-soft); }
.icon-btn.icon-btn-secondary:hover:not(:disabled) { background: #e1e6f2; }
.icon-btn.icon-btn-secondary.active { background: var(--primary); color: #fff; }
.icon-btn.icon-btn-danger { background: var(--danger-soft); color: var(--danger); }
.icon-btn.icon-btn-danger:hover { background: #ffd0da; }
.icon-btn-sm { width: 32px; height: 32px; }
.icon-btn-sm .material-icons { font-size: 18px; }
.icon-btn .material-icons { font-size: 22px; }

/* 드롭다운 */
.dropdown-wrap { position: relative; }
.dropdown {
  position: absolute;
  top: 48px;
  right: 0;
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
  padding: 6px;
  display: none;
  min-width: 170px;
  z-index: 60;
  border: 1px solid var(--line);
}
.dropdown.open { display: block; }
.dropdown-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 10px 12px;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  text-align: left;
}
.dropdown-item:hover { background: var(--primary-soft); color: var(--primary-dark); }
.dropdown-item .material-icons { font-size: 18px; }

/* ===== 에디터 메인 (캔버스 최대화) ===== */
.editor-main {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 12px;
  padding: 12px;
  overflow: hidden;
}
.editor-main.reference-open {
  grid-template-columns: 240px 1fr 260px;
}

@media (max-width: 980px) {
  #screen-editor.active {
    height: auto;
    min-height: calc(100dvh - var(--footer-h));
    overflow: visible;
  }
  .editor-main {
    grid-template-columns: 1fr;
    grid-template-areas: "canvas" "sidebar";
    overflow: visible;
    padding: 10px;
  }
  .editor-main.reference-open {
    grid-template-columns: 1fr;
    grid-template-areas: "canvas" "reference" "sidebar";
  }
  .canvas-area  { grid-area: canvas; min-height: 320px; }
  .sidebar      { grid-area: sidebar; }
  .reference-panel { grid-area: reference; }
}

/* 사이드바 */
.sidebar {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 14px;
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow-y: auto;
  min-height: 0;
}
.tool-section { display: flex; flex-direction: column; gap: 8px; }
.tool-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-soft);
  letter-spacing: 0.5px;
}
.tool-hint {
  font-size: 11px;
  color: var(--text-soft);
  margin: 0;
  padding: 5px 8px;
  background: #f4f7ff;
  border-radius: var(--radius-sm);
  text-align: center;
}

/* 붓 크기 토글 (수평·수직 중앙 정렬 완성) */
.size-toggle { display: flex; gap: 6px; }
.size-btn {
  flex: 1;
  height: 60px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 4px;
  background: #f4f7ff;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 11px;
  font-weight: 600;
  color: var(--text);
  transition: background .15s ease, border-color .15s ease;
}
.size-btn.active { background: var(--primary); border-color: var(--primary-dark); color: #fff; }
.size-dot-slot {
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.size-dot { background: var(--primary-dark); border-radius: 3px; display: block; }
.size-btn.active .size-dot { background: #fff; }
.dot-1 { width: 8px;  height: 8px; }
.dot-2 { width: 14px; height: 14px; }
.dot-3 { width: 20px; height: 20px; }
.size-label { line-height: 1; }

/* 팔레트 */
.palette {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 5px;
}
.color-swatch {
  aspect-ratio: 1 / 1;
  border-radius: 8px;
  border: 2px solid transparent;
  cursor: pointer;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.06);
  transition: transform .12s ease, border-color .12s ease;
  padding: 0;
}
.color-swatch:hover { transform: scale(1.08); }
.color-swatch.active { border-color: var(--text); transform: scale(1.05); }

.custom-color-btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 12px;
  background: linear-gradient(135deg, #ffe9b3, #ffd1e0, #cfe0ff);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: 700;
  font-size: 13px;
  color: var(--text);
  margin-top: 4px;
}
.custom-color-btn:active { transform: scale(0.98); }
.custom-color-btn .material-icons { font-size: 18px; }
.hidden-color-input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  border: 0;
  opacity: 0;
}

.current-color-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  background: #f4f7ff;
  border-radius: var(--radius-sm);
}
.current-color-label { font-size: 12px; font-weight: 600; color: var(--text-soft); }
.current-color-chip {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  border: 2px solid #fff;
  box-shadow: 0 0 0 1px var(--line);
  background: #ff7eb6;
}

/* 내보내기 3버튼 */
.export-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}
.export-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 8px 4px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background .15s ease, transform .12s ease;
}
.export-btn:hover { background: #c8daff; }
.export-btn:active { transform: translateY(1px); }
.export-btn .material-icons { font-size: 20px; }
.export-label { font-size: 11px; font-weight: 700; }

/* ===== 캔버스 영역 (꽉 채우기) ===== */
.canvas-area {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 12px;
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  min-height: 0;
}
.canvas-wrapper {
  position: relative;
  background: #ffffff;
  border: 2px solid var(--primary-soft);
  border-radius: 10px;
  user-select: none;
  touch-action: none;
  max-width: 100%;
  max-height: 100%;
  overflow: hidden;
}
.pixel-grid {
  display: grid;
  width: var(--grid-w, 480px);
  height: var(--grid-h, 480px);
  cursor: crosshair;
  position: relative;
}
.pixel-cell {
  border: 1px solid rgba(120, 130, 160, 0.18);
  background: transparent;
}

/* 중앙 가이드라인 (X / Y축) */
.guide-line {
  position: absolute;
  pointer-events: none;
  z-index: 5;
  opacity: 0.85;
  transition: opacity .15s ease;
}
.guide-h {
  left: 0; right: 0;
  top: 50%;
  height: 0;
  border-top: 1.5px dashed rgba(255, 126, 182, 0.7);
  transform: translateY(-0.75px);
}
.guide-v {
  top: 0; bottom: 0;
  left: 50%;
  width: 0;
  border-left: 1.5px dashed rgba(255, 126, 182, 0.7);
  transform: translateX(-0.75px);
}
.canvas-wrapper.guides-hidden .guide-line { display: none; }

/* ===== 참고 패널 ===== */
.reference-panel {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 12px;
  box-shadow: var(--shadow-soft);
  display: none;
  flex-direction: column;
  gap: 10px;
  overflow-y: auto;
  min-height: 0;
}
.editor-main.reference-open .reference-panel { display: flex; }
.reference-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.reference-header h3 {
  margin: 0;
  font-size: 15px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.reference-header .material-icons { color: var(--primary-dark); font-size: 18px; }

.reference-upload {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px;
  border: 2px dashed var(--primary-soft);
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--primary-dark);
  font-weight: 600;
  font-size: 13px;
  justify-content: center;
  background: #fafcff;
}
.reference-upload:hover { background: var(--primary-soft); }
.reference-preview {
  background: #f4f7ff;
  border-radius: var(--radius-md);
  min-height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  overflow: hidden;
}
.reference-preview img {
  max-width: 100%;
  max-height: 50vh;
  border-radius: 8px;
  object-fit: contain;
}
.reference-hint {
  font-size: 13px;
  color: var(--text-soft);
  text-align: center;
  margin: 0;
  line-height: 1.5;
}

/* ===== 모달 ===== */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(28, 36, 60, 0.45);
  z-index: 200;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal.open { display: flex; }
.modal-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 24px 22px 20px;
  max-width: 360px;
  width: 100%;
  text-align: center;
  box-shadow: 0 20px 50px rgba(0,0,0,0.2);
}
.modal-icon .material-icons { font-size: 46px; color: var(--primary); }
.modal-title { margin: 10px 0 6px; font-size: 20px; }
.modal-message { color: var(--text-soft); margin: 0 0 20px; font-size: 14px; line-height: 1.5; }
.modal-actions { display: flex; gap: 10px; justify-content: center; }
.modal-actions .btn { min-width: 96px; }

/* ===== 토스트 ===== */
.toast {
  position: fixed;
  bottom: calc(var(--footer-h) + 14px);
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: rgba(31, 42, 68, 0.92);
  color: #fff;
  padding: 11px 18px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
  z-index: 300;
  max-width: calc(100vw - 32px);
  text-align: center;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ===== Footer (뷰포트 고정) ===== */
.app-footer {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: var(--footer-h);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(6px);
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 0 12px;
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
.app-footer a {
  color: var(--text-soft);
  text-decoration: none;
  font-weight: 600;
  font-size: 13px;
  text-align: center;
}
.app-footer a:hover { color: var(--primary-dark); text-decoration: underline; }

/* ===== 모바일 ===== */
@media (max-width: 720px) {
  .topbar { padding: 6px 10px; gap: 4px; min-height: 56px; }
  .topbar-left .brand-small { display: none; }
  .icon-btn { width: 38px; height: 38px; }
  .icon-btn .material-icons { font-size: 22px; }
  .history-group { padding: 0 4px; }
  .sidebar { padding: 12px; gap: 12px; }
  .palette { grid-template-columns: repeat(10, 1fr); }
  .canvas-area { padding: 10px; min-height: 280px; }
}

@media (max-width: 420px) {
  .topbar { padding: 6px 6px; gap: 3px; }
  .icon-btn { width: 34px; height: 34px; }
  .icon-btn .material-icons { font-size: 20px; }
  .palette { grid-template-columns: repeat(8, 1fr); }
}