/* ── Reset & Variables ─────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg:       #0f1117;
  --surface:  #1a1d27;
  --surface2: #22263a;
  --border:   rgba(255, 255, 255, 0.08);
  --text:     rgba(255, 255, 255, 0.90);
  --text-dim: rgba(255, 255, 255, 0.40);
  --accent:   #7c3aed;
  --accent2:  #ec4899;
  --gradient: linear-gradient(135deg, #7c3aed, #ec4899);
  --radius:   12px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ─────────────────────────────────────────── */
header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 28px;
  font-size: 18px;
  font-weight: 700;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.badge {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 12px;
  border-radius: 20px;
  background: rgba(124, 58, 237, 0.15);
  color: #a78bfa;
  border: 1px solid rgba(124, 58, 237, 0.3);
}

/* ── Layout ──────────────────────────────────────────── */
.layout {
  display: flex;
  flex: 1;
  height: calc(100vh - 57px);
  overflow: hidden;
}

/* ── Controls (Left) ─────────────────────────────────── */
.controls {
  width: 340px;
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  overflow-y: auto;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.field label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.label-hint {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  font-size: 11px;
}

.field .hint {
  font-size: 11px;
  color: var(--text-dim);
}

.field textarea,
.field input[type="number"],
.field select {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 14px;
  padding: 10px 12px;
  width: 100%;
  outline: none;
  transition: border-color 0.2s;
  font-family: inherit;
}

.field textarea:focus,
.field input[type="number"]:focus,
.field select:focus {
  border-color: rgba(124, 58, 237, 0.55);
}

.field textarea {
  resize: vertical;
  min-height: 110px;
  line-height: 1.55;
}

.field select option { background: var(--surface2); }

/* 너비·높이 나란히 */
.field-row {
  display: flex;
  gap: 12px;
}
.field-row .field { flex: 1; }

/* 시드 행 */
.seed-row {
  display: flex;
  gap: 8px;
}
.seed-row input { flex: 1; }
.seed-row button {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 18px;
  padding: 8px 13px;
  cursor: pointer;
  transition: background 0.15s;
  flex-shrink: 0;
}
.seed-row button:hover { background: var(--bg); }

/* 생성 버튼 */
.btn-generate {
  background: var(--gradient);
  border: none;
  border-radius: 10px;
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  padding: 14px;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
  margin-top: 2px;
}
.btn-generate:hover  { opacity: 0.88; }
.btn-generate:active { transform: scale(0.98); }
.btn-generate:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

/* ── Viewer (Right) ──────────────────────────────────── */
.viewer {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 24px;
  gap: 18px;
  overflow-y: auto;
}

/* 이미지 영역 */
.image-area {
  position: relative;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  min-height: 300px;
  max-height: 530px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex-shrink: 0;
}

/* 플레이스홀더 */
.placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  color: var(--text-dim);
  padding: 40px;
}
.placeholder-icon { font-size: 56px; }
.placeholder p    { font-size: 15px; text-align: center; line-height: 1.65; }

/* 스피너 */
.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* 생성된 이미지 */
#mainImg {
  max-width: 100%;
  max-height: 530px;
  object-fit: contain;
  display: block;
  border-radius: var(--radius);
}

/* 에러 메시지 */
.error-msg {
  color: #f87171;
  font-size: 14px;
  text-align: center;
  padding: 24px;
  line-height: 1.7;
}
.error-msg small { color: var(--text-dim); font-size: 12px; }
/* 서버 장애 메시지 링크 */
#errorServerDown a {
  color: #fb923c;
  text-decoration: underline;
}
#errorServerDown a:hover {
  color: #fdba74;
}
/* 진단 중 텍스트 */
#errorChecking {
  color: var(--text-dim);
  font-size: 13px;
}

/* 액션 버튼 */
.actions {
  display: flex;
  gap: 10px;
  flex-shrink: 0;
}
.btn-action {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
  padding: 9px 18px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}
.btn-action:hover {
  background: var(--surface2);
  border-color: rgba(255,255,255,0.15);
}

/* 히스토리 */
.history-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
}
.history-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(82px, 1fr));
  gap: 8px;
}
.history-item {
  aspect-ratio: 1;
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  border: 2px solid transparent;
  transition: border-color 0.2s, transform 0.15s;
  background: var(--surface2);
}
.history-item:hover {
  border-color: var(--accent);
  transform: scale(1.06);
}
.history-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Shake (빈 프롬프트 경고) */
@keyframes shake {
  0%,100% { transform: translateX(0); }
  20%      { transform: translateX(-6px); }
  40%      { transform: translateX(6px); }
  60%      { transform: translateX(-4px); }
  80%      { transform: translateX(4px); }
}
.shake {
  animation: shake 0.4s ease;
  border-color: #f87171 !important;
}

/* ── 스크롤바 ──────────────────────────────────────── */
::-webkit-scrollbar       { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}