/* Ds2 Tutorial — helpds 사이트 통합 + 3D 인터랙티브 */
/* 기본 디자인: helpds 메인 (cyan/blue) + Tutorial 골드 액센트 */

:root {
  /* helpds 사이트 색상 (메인 일관성) */
  --primary:    #0066FF;
  --secondary:  #00D9FF;
  --dark:       #0A0E27;
  --darker:     #060920;
  --light:      #F8FAFC;

  /* Tutorial 골드 액센트 (sub-brand) */
  --accent:       #f0c456;
  --accent-hover: #ffd166;
  --accent-muted: rgba(240,196,86,0.15);

  /* 시맨틱 */
  --success: #00FF88;
  --warning: #FFB800;
  --danger:  #FF3366;

  /* 다크 테마 변수 (helpds 동일) */
  --bg-main:   #0A0E27;
  --bg-page:   rgba(17, 24, 39, 0.97);
  --bg-card:   rgba(30, 41, 59, 0.6);
  --bg-hover:  rgba(0, 102, 255, 0.15);
  --bg-input:  rgba(10, 14, 39, 0.8);

  --text-primary:   #F8FAFC;
  --text-secondary: rgba(248, 250, 252, 0.7);
  --text-muted:     rgba(248, 250, 252, 0.5);

  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(0, 102, 255, 0.4);
  --border-accent: rgba(240, 196, 86, 0.5);

  --shadow:    rgba(0, 0, 0, 0.6);
  --gradient-blue: linear-gradient(135deg, #0066FF, #00D9FF);
  --gradient-gold: linear-gradient(135deg, #f0c456, #ffd166);

  /* 간격/반경 */
  --r-sm: 4px;
  --r:    8px;
  --r-lg: 12px;
  --r-xl: 20px;

  /* 폰트 (helpds 동일) */
  --font-body: 'Inter', 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  /* 줌인 시 전체 페이지 세로 스크롤 보장 */
  overflow-x: hidden;
  overflow-y: auto;
  height: auto;
  min-height: 100%;
}
html { scroll-behavior: smooth; }
body {
  background: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  /* 하단 여유 공간 — 줌인 시 컨텐츠 잘림 방지 */
  padding-bottom: 40px;
}

a { color: var(--secondary); text-decoration: none; }
a:hover { color: var(--accent); }

/* ===== Header ===== */
.tut-header {
  background: rgba(10, 14, 39, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}
/* 줌인 / 작은 화면 - sticky 해제하여 스크롤 영역 확보 */
@media (max-height: 700px) {
  .tut-header { position: static; }
}
.tut-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
}
.tut-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}
.tut-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.tut-brand-icon {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  background: var(--gradient-gold);
  border-radius: 10px;
  font-weight: 800;
  color: var(--dark);
  font-size: 14px;
}
.tut-brand-text {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
}
.tut-brand-text .sub {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
  margin-left: 8px;
}
.tut-nav-links {
  display: flex;
  gap: 6px;
  list-style: none;
}
.tut-nav-links a {
  padding: 8px 14px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  transition: all 0.2s;
}
.tut-nav-links a:hover {
  background: rgba(0,102,255,0.15);
  border-color: var(--secondary);
  color: var(--text-primary);
}
.tut-nav-links a.active {
  background: var(--accent-muted);
  border-color: var(--accent);
  color: var(--accent);
}

/* ===== Hero ===== */
.tut-hero {
  padding: 60px 0;
  background: linear-gradient(135deg, rgba(0,102,255,0.08), rgba(240,196,86,0.05));
  border-bottom: 1px solid var(--border-color);
}
.tut-hero-inner { text-align: center; max-width: 900px; margin: 0 auto; }
.tut-eyebrow {
  display: inline-block;
  padding: 6px 16px;
  background: var(--accent-muted);
  border: 1px solid var(--border-accent);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.tut-hero h1 {
  font-size: 48px;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 16px;
}
.tut-hero h1 .grad { background: var(--gradient-gold); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.tut-hero p.lead {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.tut-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  margin-top: 32px;
}
.tut-stat-num {
  font-size: 40px;
  font-weight: 800;
  background: var(--gradient-blue);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-family: var(--font-mono);
  line-height: 1;
}
.tut-stat-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 6px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}
.btn-primary {
  background: var(--gradient-gold);
  color: var(--dark);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(240,196,86,0.3);
  color: var(--dark);
}
.btn-secondary {
  background: rgba(255,255,255,0.05);
  color: var(--text-primary);
  border-color: var(--border-color);
}
.btn-secondary:hover {
  border-color: var(--secondary);
  background: rgba(0,217,255,0.1);
  color: var(--text-primary);
}
.cta-row { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; margin-top: 28px; }

/* ===== Section ===== */
.tut-section { padding: 64px 0; }
.tut-section.alt { background: rgba(255,255,255,0.02); }
.tut-section-head { text-align: center; margin-bottom: 40px; }
.tut-section-head h2 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 12px;
}
.tut-section-head .desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 720px;
  margin: 0 auto;
}

/* ===== Cards Grid ===== */
.tut-grid { display: grid; gap: 18px; }
.tut-grid-3 { grid-template-columns: repeat(3, 1fr); }
.tut-grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1000px) {
  .tut-grid-3, .tut-grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .tut-grid-3, .tut-grid-4 { grid-template-columns: 1fr; }
}

.tut-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--r-lg);
  padding: 24px;
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.2s;
  display: block;
  position: relative;
  overflow: hidden;
}
.tut-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-accent);
  background: rgba(30,41,59,0.85);
  box-shadow: 0 6px 24px rgba(0,0,0,0.4);
  color: var(--text-primary);
}
.tut-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-muted);
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
}
.tut-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.tut-card p { font-size: 14px; color: var(--text-secondary); margin-bottom: 10px; }
.tut-card .meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
}

/* Tier 카드 */
.tier-card { padding: 30px; position: relative; }
.tier-num {
  position: absolute;
  top: 18px;
  right: 24px;
  font-size: 72px;
  font-weight: 900;
  font-family: var(--font-mono);
  color: var(--accent);
  opacity: 0.15;
  line-height: 1;
}
.tier-card h3 { font-size: 22px; }
.tier-card .duration { font-size: 12px; color: var(--text-muted); margin: 4px 0 14px; }
.tier-card ul { list-style: none; font-size: 13px; color: var(--text-secondary); margin-bottom: 12px; }
.tier-card ul li { padding: 3px 0; }
.tier-card ul li::before { content: "▸ "; color: var(--accent); }

/* Scenario 카드 */
.scn-card { padding: 18px; }
.scn-card .sid {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent);
  font-size: 12px;
}
.scn-card .diff {
  display: inline-block;
  font-size: 10px;
  padding: 2px 7px;
  border-radius: 4px;
  margin-left: 8px;
  font-weight: 600;
}
.diff-easy { background: rgba(0,255,136,0.15); color: var(--success); }
.diff-mid  { background: rgba(0,217,255,0.15); color: var(--secondary); }
.diff-hard { background: rgba(255,51,102,0.15); color: var(--danger); }
.scn-card .name { font-size: 17px; font-weight: 700; margin: 6px 0; }
.scn-card .domain { font-size: 13px; color: var(--text-muted); }

/* ===== 3D Viewer ===== */
.three-viewer {
  position: relative;
  background: linear-gradient(180deg, #060920, #0a0e27);
  border: 1px solid var(--border-color);
  border-radius: var(--r-lg);
  overflow: hidden;
  width: 100%;
  min-height: 420px;
  /* viewport 의 70% 초과 안 함 — 줌인 시 다른 콘텐츠 가리지 않음 */
  max-height: 70vh;
  aspect-ratio: 16/9;
  max-width: 100%;
}
.three-viewer > div:first-child {
  position: absolute; inset: 0; width: 100%; height: 100%;
}
.three-viewer canvas { display: block; width: 100% !important; height: 100% !important; }
.three-hud {
  position: absolute;
  top: 12px;
  left: 12px;
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(10,14,39,0.85);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-primary);
}
.three-hud .sid { color: var(--accent); font-weight: 700; }
.three-hud .time { color: var(--secondary); }

.three-controls {
  position: absolute;
  bottom: 12px;
  left: 12px;
  right: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(10,14,39,0.85);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 16px;
}
.three-btn {
  padding: 6px 10px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
}
.three-btn:hover { border-color: var(--accent); }
.three-btn.primary {
  background: var(--gradient-gold);
  color: var(--dark);
  border-color: transparent;
  font-weight: 600;
}
.three-slider {
  flex: 1;
  height: 6px;
  background: rgba(255,255,255,0.1);
  border-radius: 3px;
  appearance: none;
  outline: none;
}
.three-slider::-webkit-slider-thumb {
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}
.three-toggles {
  position: absolute;
  top: 12px;
  right: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: rgba(10,14,39,0.85);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 14px;
}
.three-toggles label {
  font-size: 12px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}
.three-toggles input[type=checkbox] { accent-color: var(--accent); }

/* Scenario page layout */
.scn-page { display: grid; grid-template-columns: 1.5fr 1fr; gap: 24px; margin-top: 24px; }
@media (max-width: 1000px) { .scn-page { grid-template-columns: 1fr; } }
.scn-info-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--r-lg);
  padding: 20px 24px;
  margin-bottom: 16px;
}
.scn-info-card h4 {
  font-size: 13px;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ===== Table ===== */
.tut-table-wrap {
  overflow-x: auto;
  margin: 12px 0;
  border-radius: var(--r);
  border: 1px solid var(--border-color);
}
.tut-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.tut-table th, .tut-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
}
.tut-table th {
  background: rgba(0,102,255,0.15);
  color: var(--text-secondary);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 700;
}
.tut-table tr:last-child td { border-bottom: none; }
.tut-table tr:hover { background: rgba(0,102,255,0.05); }
.tut-table code {
  background: rgba(0,0,0,0.4);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
}
.pill { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 10px; font-weight: 700; }
.pill-in  { background: rgba(0,217,255,0.15); color: var(--secondary); }
.pill-out { background: rgba(255,184,0,0.15); color: var(--warning); }
.pill-mem { background: rgba(167,139,250,0.15); color: #a78bfa; }

/* ===== Code Block ===== */
.codeblock {
  background: #060920;
  border: 1px solid var(--border-color);
  border-radius: var(--r);
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  overflow-x: auto;
  color: var(--text-primary);
}
.codeblock .k { color: var(--accent); }
.codeblock .v { color: var(--success); }
.codeblock .c { color: var(--text-muted); font-style: italic; }

/* ===== Footer ===== */
.tut-footer {
  background: var(--darker);
  border-top: 1px solid var(--border-color);
  padding: 40px 0 24px;
  margin-top: 60px;
}
.tut-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 24px;
}
@media (max-width: 700px) { .tut-footer-grid { grid-template-columns: 1fr; } }
.tut-footer h4 {
  font-size: 12px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
}
.tut-footer ul { list-style: none; }
.tut-footer li { margin: 4px 0; }
.tut-footer a { color: var(--text-secondary); font-size: 13px; }
.tut-footer-bottom {
  padding-top: 18px;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
}

/* ===== Tooltip / Label (3D HUD) ===== */
.three-label {
  position: absolute;
  background: rgba(10,14,39,0.95);
  border: 1px solid var(--border-accent);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 12px;
  color: var(--text-primary);
  pointer-events: none;
  font-family: var(--font-mono);
  white-space: nowrap;
  z-index: 10;
  display: none;
}
.three-label.visible { display: block; }
.three-label .tag { color: var(--accent); font-weight: 700; }
.three-label .addr { color: var(--secondary); }

/* Print */
@media print {
  .tut-header, .tut-footer, .three-controls, .three-toggles { display: none; }
  body { background: white; color: black; }
}

/* Mobile */
@media (max-width: 700px) {
  .tut-hero h1 { font-size: 32px; }
  .tut-hero p.lead { font-size: 15px; }
  .tut-stats { gap: 24px; }
  .tut-stat-num { font-size: 28px; }
  .tut-nav-links { gap: 4px; }
  .tut-nav-links a { padding: 6px 9px; font-size: 12px; }
}