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

:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-2: #475569;
  --text-3: #94a3b8;
  --success: #10b981;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 12px rgba(0,0,0,.06);
  --shadow-lg: 0 8px 30px rgba(0,0,0,.12);
}

html, body {
  height: 100%;
  font-family: 'Apple SD Gothic Neo', 'Noto Sans KR', -apple-system, sans-serif;
  background: var(--surface-2);
  color: var(--text);
  line-height: 1.6;
}

/* ── Screen System ── */
.screen { display: none; min-height: 100vh; }
.screen.active { display: flex; flex-direction: column; }

/* ──────────────────────────────
   랜딩 페이지
────────────────────────────── */
#screen-landing {
  background: linear-gradient(160deg, #f0f4ff 0%, #fafafa 60%);
  position: relative;
  overflow: hidden;
}

.landing-header {
  padding: 24px 32px;
}

.logo {
  font-size: 22px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.5px;
}

.landing-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 32px 60px;
  max-width: 560px;
  z-index: 1;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 24px;
}
.badge::before { content: '✦'; font-size: 10px; }

.landing-title {
  font-size: clamp(32px, 6vw, 52px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -1px;
  color: var(--text);
  margin-bottom: 20px;
}

.highlight {
  color: var(--primary);
  position: relative;
}
.highlight::after {
  content: '';
  position: absolute;
  bottom: 2px; left: 0; right: 0;
  height: 4px;
  background: var(--primary);
  opacity: 0.2;
  border-radius: 2px;
}

.landing-desc {
  font-size: 17px;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 36px;
}

.feature-list {
  display: flex;
  gap: 20px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-2);
}

.feature-icon {
  font-size: 18px;
}

/* 랜딩 우측 비주얼 */
.landing-visual {
  position: absolute;
  right: -20px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 0;
  opacity: 0.65;
}

.mock-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 28px;
  width: 300px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
}

.mock-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}

.mock-lines { margin-bottom: 16px; }

.mock-line {
  height: 8px;
  background: var(--border);
  border-radius: 4px;
  margin-bottom: 8px;
}
.mock-line.w80 { width: 80%; }
.mock-line.w60 { width: 60%; }
.mock-line.w90 { width: 90%; }
.mock-line.w50 { width: 50%; }
.mock-line.w70 { width: 70%; }
.mock-line.w55 { width: 55%; }
.mock-line.w40 { width: 40%; }

.mock-arrow-down {
  text-align: center;
  font-size: 20px;
  color: var(--primary);
  margin: 12px 0;
  font-weight: bold;
}

.mock-section { margin-bottom: 14px; }

.mock-section-title {
  height: 10px;
  width: 40%;
  background: var(--primary-light);
  border-radius: 4px;
  margin-bottom: 8px;
}

/* ──────────────────────────────
   앱 공통 헤더
────────────────────────────── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.btn-back {
  background: none;
  border: none;
  color: var(--text-2);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 8px;
  transition: background 0.15s;
}
.btn-back:hover { background: var(--surface-2); }

.step-indicator {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-3);
  background: var(--surface-2);
  padding: 4px 12px;
  border-radius: 100px;
}

/* ──────────────────────────────
   앱 메인
────────────────────────────── */
.app-main {
  flex: 1;
  padding: 28px 20px 40px;
  max-width: 680px;
  width: 100%;
  margin: 0 auto;
}

.section-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 24px;
  color: var(--text);
}

/* ──────────────────────────────
   필드 그룹
────────────────────────────── */
.field-group { margin-bottom: 28px; }

.field-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 10px;
}

/* ──────────────────────────────
   템플릿 그리드
────────────────────────────── */
.template-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.template-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  padding: 16px;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.15s;
  text-align: left;
}

.template-card:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.template-card.selected {
  border-color: var(--primary);
  background: var(--primary-light);
}

.template-icon { font-size: 22px; margin-bottom: 2px; }

.template-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
}

.template-desc {
  font-size: 12px;
  color: var(--text-3);
}

/* ──────────────────────────────
   텍스트에어리어
────────────────────────────── */
.textarea-main {
  width: 100%;
  min-height: 220px;
  padding: 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background: var(--surface);
  resize: vertical;
  transition: border-color 0.15s;
  outline: none;
}
.textarea-main:focus { border-color: var(--primary); }
.textarea-main::placeholder { color: var(--text-3); }

.char-count {
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-3);
  text-align: right;
}

/* ──────────────────────────────
   버튼
────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 700;
  padding: 14px 28px;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:active { transform: scale(0.98); }
.btn-primary:disabled {
  background: var(--text-3);
  cursor: not-allowed;
  transform: none;
}

.btn-primary.btn-large {
  font-size: 17px;
  padding: 16px 36px;
  border-radius: var(--radius-lg);
}

.btn-primary.btn-full {
  width: 100%;
  justify-content: center;
}

.btn-arrow {
  font-size: 18px;
  transition: transform 0.15s;
}
.btn-primary:hover .btn-arrow { transform: translateX(4px); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  color: var(--text-2);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 18px;
  cursor: pointer;
  transition: all 0.15s;
}
.btn-secondary:hover {
  border-color: var(--text-2);
  background: var(--surface-2);
}

.btn-copy {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--surface);
  color: var(--primary);
  border: 2px solid var(--primary);
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 700;
  padding: 10px 18px;
  cursor: pointer;
  transition: all 0.15s;
}
.btn-copy:hover { background: var(--primary-light); }
.btn-copy.copied {
  background: var(--success);
  border-color: var(--success);
  color: white;
}

/* ──────────────────────────────
   결과 화면
────────────────────────────── */
.result-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.result-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.result-meta {
  font-size: 13px;
  color: var(--text-3);
  margin-bottom: 16px;
  padding: 10px 14px;
  background: var(--surface-2);
  border-radius: 8px;
}

.result-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 28px;
  white-space: pre-wrap;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
  box-shadow: var(--shadow);
  min-height: 200px;
}

.result-box .section-heading {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--primary);
  margin-top: 20px;
  margin-bottom: 6px;
}
.result-box .section-heading:first-child { margin-top: 0; }

.result-box .section-content {
  color: var(--text);
  margin-bottom: 4px;
}

.result-box .action-item {
  display: flex;
  gap: 8px;
  align-items: baseline;
  padding: 6px 0;
  border-bottom: 1px solid var(--surface-2);
}
.result-box .action-item:last-child { border-bottom: none; }

.result-box .action-badge {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 100px;
  white-space: nowrap;
  flex-shrink: 0;
}

.result-footer { margin-top: 8px; }

/* ──────────────────────────────
   로딩 애니메이션
────────────────────────────── */
.loading-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
}

.spinner {
  width: 18px; height: 18px;
  border: 3px solid rgba(255,255,255,0.4);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ──────────────────────────────
   반응형
────────────────────────────── */
@media (max-width: 640px) {
  .landing-main { padding: 32px 20px 200px; }
  .landing-visual {
    position: absolute;
    right: 50%;
    bottom: 0;
    top: auto;
    transform: translateX(50%) scale(0.7);
    transform-origin: bottom center;
    opacity: 0.3;
  }

  .template-grid { grid-template-columns: repeat(2, 1fr); }

  .result-header { flex-direction: column; }
  .result-actions { width: 100%; }
  .btn-copy, .btn-secondary { flex: 1; justify-content: center; }
}