:root {
  --bg: #0d0d14;
  --surface: #14141e;
  --card: #1a1a28;
  --border: #252538;
  --borderBright: #353550;
  --accent: #7c6ffa;
  --accentDim: #7c6ffa18;
  --green: #34d399;
  --greenDim: #34d39918;
  --yellow: #fbbf24;
  --yellowDim: #fbbf2418;
  --red: #f87171;
  --redDim: #f8717118;
  --blue: #60a5fa;
  --blueDim: #60a5fa18;
  --orange: #fb923c;
  --orangeDim: #fb923c18;
  --text: #e2e8f0;
  --textMuted: #94a3b8;
  --textDim: #4a5568;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Noto Sans KR", sans-serif;
}

.app {
  min-height: 100vh;
}

.top-header {
  border-bottom: 1px solid var(--border);
  padding: 20px 24px;
  background: var(--surface);
}

.container {
  max-width: 900px;
  margin: 0 auto;
}

.kicker {
  font-size: 11px;
  color: var(--textMuted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.main-title {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.subtitle {
  font-size: 13px;
  color: var(--textMuted);
  margin-top: 6px;
}

.stack-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.stack-tag {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--textMuted);
  border-radius: 6px;
  padding: 3px 10px;
  font-size: 11px;
  font-weight: 600;
}

.content {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 24px 60px;
}

.phase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 8px;
  margin-bottom: 28px;
}

.phase-card {
  border-radius: 14px;
  padding: 12px 10px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
  border: 1px solid var(--border);
  background: var(--surface);
}

.phase-card.active {
  background: var(--phase-dim);
  border-color: var(--phase-color);
}

.phase-emoji {
  font-size: 22px;
  margin-bottom: 4px;
}

.phase-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--text);
}

.phase-card.active .phase-title {
  color: var(--phase-color);
}

.phase-duration {
  font-size: 10px;
  color: var(--textDim);
  margin-top: 2px;
}

.current-phase {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  padding: 14px 18px;
  border-radius: 14px;
  border: 1px solid;
}

.current-phase-emoji {
  font-size: 28px;
}

.current-phase-title {
  font-size: 20px;
  font-weight: 800;
}

.current-phase-subtitle {
  font-size: 13px;
  color: var(--textMuted);
}

.phase-duration-strong {
  color: var(--phase-color);
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.step-card {
  border-radius: 14px;
  overflow: hidden;
  transition: border-color 0.2s;
  border: 1px solid var(--border);
}

.step-card.open {
  border-color: var(--step-color-open);
}

.step-head {
  padding: 14px 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.step-card.open .step-head {
  background: var(--step-dim);
}

.step-head-title {
  font-size: 13px;
  font-weight: 700;
}

.step-head-desc {
  font-size: 12px;
  color: var(--textMuted);
  margin-top: 2px;
}

.chevron {
  color: var(--textDim);
  font-size: 18px;
  margin-left: 12px;
  transition: transform 0.2s;
}

.step-card.open .chevron {
  transform: rotate(180deg);
}

.step-body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--border);
}

.step-items {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.step-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: var(--card);
  border-radius: 10px;
}

.step-item-arrow {
  color: var(--item-color);
  font-size: 14px;
}

.step-item-name {
  font-weight: 600;
  font-size: 13px;
}

.step-item-note {
  color: var(--textMuted);
  font-size: 12px;
  margin-left: 8px;
}

.code-wrap {
  position: relative;
  background: #080810;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border);
  margin-top: 10px;
}

.code-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 14px;
  border-bottom: 1px solid var(--border);
  background: #0d0d1a;
}

.code-label {
  font-size: 11px;
  color: var(--textDim);
  font-family: monospace;
}

.copy-btn {
  background: none;
  border: none;
  color: var(--textMuted);
  cursor: pointer;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 5px;
}

.copy-btn.copied {
  color: var(--green);
}

.code-content {
  margin: 0;
  padding: 14px 16px;
  font-size: 11.5px;
  line-height: 1.75;
  color: var(--text);
  overflow-x: auto;
  font-family: "Fira Code", "JetBrains Mono", monospace;
  white-space: pre;
  tab-size: 2;
}

.checklist {
  margin-top: 32px;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  background: var(--surface);
}

.checklist-title {
  font-weight: 800;
  font-size: 16px;
  margin-bottom: 16px;
}

.checklist-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.check-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: var(--card);
  border-radius: 10px;
}

.check-icon {
  color: var(--green);
  font-size: 16px;
}

.check-label {
  font-size: 12px;
  font-weight: 600;
}

.check-phase {
  font-size: 10px;
  color: var(--textDim);
}

@media (max-width: 480px) {
  .top-header {
    padding: 16px;
  }

  .content {
    padding: 16px 16px 42px;
  }

  .main-title {
    font-size: 22px;
  }

  .current-phase-title {
    font-size: 17px;
  }

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

  .step-head {
    padding: 12px 14px;
  }

  .step-body {
    padding: 0 14px 14px;
  }
}