/* 찬돌드럼 — 토스 결(부드러운 흰 카드+소프트 섀도) × 듀오링고 결(통통한 버튼)
   규칙: 포인트는 블루 하나 / 테두리 대신 그림자 / 카드 20px, 버튼 14px, 칩 풀필 */
:root {
  --bg: #f2f4f7;
  --card: #ffffff;
  --ink: #191f28;
  --gray: #4e5968;
  --gray2: #8b95a1;
  --gray-fill: #f2f4f6;
  --line: #e5e8eb;
  --blue: #3182f6;
  --blue-deep: #1b64da;
  --blue-soft: #e8f1fe;
  --navy: #151b26;
  --r-card: 20px;
  --r-btn: 14px;
  --sh-sm: 0 1px 2px rgba(25, 31, 40, 0.04), 0 4px 14px rgba(25, 31, 40, 0.05);
  --sh-md: 0 2px 6px rgba(25, 31, 40, 0.04), 0 14px 36px rgba(25, 31, 40, 0.08);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Pretendard Variable", Pretendard, "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif;
  line-height: 1.6;
  min-height: 100dvh;
  word-break: keep-all;
  -webkit-font-smoothing: antialiased;
}

.view[hidden] { display: none; }

button { font-family: inherit; }

/* ── 상단바 ── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  padding: 0 clamp(20px, 4vw, 44px);
  background: rgba(242, 244, 247, 0.86);
  backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.badge {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background: var(--blue);
  color: #fff;
  font-size: 16px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 3px 8px rgba(49, 130, 246, 0.35);
}
.brand-name { font-size: 19px; font-weight: 800; letter-spacing: -0.03em; }
.topnav { display: flex; gap: 2px; }
.topnav a {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--gray);
  text-decoration: none;
  padding: 9px 16px;
  border-radius: 12px;
  transition: background 0.15s, color 0.15s;
}
.topnav a:hover { background: var(--gray-fill); color: var(--ink); }

/* ── 홈 ── */
#homeView { max-width: 1080px; margin: 0 auto; padding: clamp(30px, 5vh, 60px) clamp(20px, 4vw, 44px) 72px; }
.home-brand {
  font-size: clamp(44px, 7vw, 76px);
  font-weight: 900;
  letter-spacing: -0.05em;
  line-height: 1.05;
  animation: rise 0.6s var(--ease-out) both;
}
.home-brand .dot { color: var(--blue); }
.home-tag {
  margin-top: 10px;
  font-size: clamp(15px, 1.8vw, 19px);
  font-weight: 500;
  color: var(--gray2);
  animation: rise 0.6s var(--ease-out) 0.08s both;
}

/* 위젯 */
.widgets {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 16px;
  margin-top: 36px;
  animation: rise 0.6s var(--ease-out) 0.16s both;
}
.widget {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--card);
  border-radius: var(--r-card);
  box-shadow: var(--sh-sm);
  padding: 26px;
  text-decoration: none;
  color: var(--ink);
  transition: transform 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out);
}
.widget:hover { transform: translateY(-4px); box-shadow: var(--sh-md); }
.widget:active { transform: translateY(0) scale(0.99); }
.widget-icon {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 27px;
  margin-bottom: 10px;
  background: var(--blue-soft);
}
.widget:nth-of-type(2) .widget-icon { background: #e6f6ef; }
.widget:nth-of-type(3) .widget-icon { background: #fff2df; }
.widget-main {
  grid-row: 1 / 3;
  background: linear-gradient(160deg, #3f8bf8, #2470ec);
  color: #fff;
  justify-content: flex-end;
  min-height: 300px;
  box-shadow: 0 8px 24px rgba(49, 130, 246, 0.3);
}
.widget-main:hover { box-shadow: 0 14px 34px rgba(49, 130, 246, 0.38); }
.widget-main .widget-icon { background: rgba(255, 255, 255, 0.18); }
.widget-kicker { font-size: 13px; font-weight: 700; opacity: 0.85; }
.widget h2 { font-size: clamp(22px, 2.6vw, 30px); font-weight: 800; letter-spacing: -0.03em; line-height: 1.2; }
.widget-sub { font-size: 14.5px; opacity: 0.75; max-width: 34ch; font-weight: 500; }
.widget-go {
  margin-top: 14px;
  align-self: flex-start;
  font-size: 14px;
  font-weight: 800;
  padding: 10px 22px;
  border-radius: 999px;
  background: #fff;
  color: var(--blue-deep);
  box-shadow: 0 3px 0 rgba(0, 0, 0, 0.12);
}
.widget:not(.widget-main) .widget-go {
  background: var(--gray-fill);
  color: var(--gray);
  box-shadow: none;
}
.widget:not(.widget-main):hover .widget-go { background: var(--blue-soft); color: var(--blue-deep); }

/* ── 드럼 무대 ── */
.kit-stage {
  position: relative;
  margin-top: 16px;
  background:
    radial-gradient(640px 300px at 50% 4%, rgba(96, 140, 255, 0.16), transparent 70%),
    linear-gradient(180deg, #1a2230, var(--navy));
  border-radius: 24px;
  box-shadow: var(--sh-md);
  padding: 26px 18px 8px;
  overflow: hidden;
  animation: rise 0.6s var(--ease-out) 0.24s both;
}
.kit-glow {
  position: absolute;
  inset: auto 0 -40px 0;
  height: 130px;
  background: radial-gradient(50% 100% at 50% 100%, rgba(96, 140, 255, 0.14), transparent);
  pointer-events: none;
}
#drumkitBox { max-width: 600px; margin: 0 auto; }
.drumkit { width: 100%; height: auto; display: block; }
.kit-hint { text-align: center; font-size: 12.5px; color: rgba(255, 255, 255, 0.5); padding: 8px 0 12px; font-weight: 500; }

@keyframes rise {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 드럼 조각 */
.kit-piece { cursor: pointer; transition: filter 0.12s; }
.kit-piece:hover { filter: brightness(1.18); }
.kit-piece.hit { animation: kit-hit 0.16s ease-out; }
@keyframes kit-hit {
  0% { filter: brightness(2) drop-shadow(0 0 14px rgba(140, 175, 255, 0.95)); }
  100% { filter: brightness(1); }
}
.kit-stand { stroke: #3c4453; stroke-width: 3; stroke-linecap: round; }
.kit-cymbal { fill: #d3a044; stroke: #97702a; stroke-width: 1; }
.kit-bell { fill: #ecc267; }
.kit-head { fill: #f4f5f7; }
.kit-rim { fill: none; stroke: #68707f; stroke-width: 2.5; }
.kit-shell { fill: #242c3a; stroke: #4c5567; stroke-width: 1; }
.kit-shell-btm { fill: #1a212d; }
.kit-kick-shell { fill: #242c3a; stroke: #4c5567; stroke-width: 3; }
.kit-kick-head { fill: #f4f5f7; stroke: #68707f; stroke-width: 2.5; }
.kit-kick-logo { font-size: 13px; font-weight: 800; letter-spacing: 0.22em; fill: #3182f6; text-anchor: middle; }
.kit-kick-logo-sub { font-size: 9px; letter-spacing: 0.42em; fill: #8b95a1; }
.kit-label {
  font-size: 10.5px;
  fill: rgba(255, 255, 255, 0.65);
  text-anchor: middle;
  opacity: 0;
  transition: opacity 0.15s;
  pointer-events: none;
}
.kit-piece:hover .kit-label { opacity: 1; }

/* ── 연습 레이아웃 ── */
.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 24px;
  max-width: 1240px;
  margin: 0 auto;
  padding: 24px clamp(16px, 3vw, 32px) 72px;
}
.sidebar {
  background: var(--card);
  border-radius: var(--r-card);
  box-shadow: var(--sh-sm);
  padding: 18px 14px 28px;
  align-self: start;
  position: sticky;
  top: 84px;
}
.back-home {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--gray);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 999px;
  background: var(--gray-fill);
  margin: 2px 0 16px 4px;
  transition: background 0.15s, color 0.15s;
}
.back-home:hover { background: var(--blue-soft); color: var(--blue-deep); }

.nav-course { margin-bottom: 20px; }
.nav-course h3 { font-size: 13px; font-weight: 800; color: var(--blue); padding: 0 12px 2px; }
.nav-desc { font-size: 12px; color: var(--gray2); padding: 0 12px 8px; line-height: 1.5; }
.nav-lesson {
  display: flex;
  align-items: center;
  gap: 9px;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  color: var(--gray);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 12px;
  border-radius: 12px;
  cursor: pointer;
  transition: background 0.13s, color 0.13s;
}
.nav-lesson:hover { background: var(--gray-fill); color: var(--ink); }
.nav-lesson.active { background: var(--blue-soft); color: var(--blue-deep); font-weight: 700; }
.nav-lesson.done .nav-check { color: var(--blue); }
.nav-check { width: 15px; flex-shrink: 0; font-weight: 800; color: transparent; font-size: 13px; }
.nav-sub { display: block; font-size: 11.5px; font-weight: 500; color: var(--gray2); }

/* ── 본문 ── */
.content { min-width: 0; }
.lesson-panel { display: flex; flex-direction: column; gap: 14px; }
.course-name { font-size: 13px; color: var(--blue); font-weight: 700; }
.lesson-head h2 { font-size: 28px; font-weight: 800; letter-spacing: -0.03em; line-height: 1.2; margin: 2px 0 4px; }
.goal { color: var(--gray); font-size: 15px; max-width: 65ch; }

.legend { display: flex; flex-wrap: wrap; gap: 6px; }
.legend-chip {
  font-size: 12px;
  font-weight: 600;
  background: var(--card);
  color: var(--gray);
  padding: 5px 13px;
  border-radius: 999px;
  box-shadow: var(--sh-sm);
}

/* ── 악보 ── */
.notation-wrap {
  position: relative;
  background: var(--card);
  border-radius: var(--r-card);
  box-shadow: var(--sh-sm);
  padding: 16px 10px;
}
.notation-scroll { overflow-x: auto; }
.notation-scroll svg { display: block; margin: 0 auto; }

.count-badge {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.85);
  background: var(--blue);
  color: #fff;
  font-size: 27px;
  font-weight: 800;
  padding: 10px 30px;
  border-radius: 999px;
  box-shadow: 0 8px 24px rgba(49, 130, 246, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.08s, transform 0.08s;
  z-index: 2;
}
.count-badge.show { opacity: 1; transform: translate(-50%, -50%) scale(1); }

.nt-staff { stroke: #9aa1ac; stroke-width: 1; }
.nt-barline { stroke: #454c59; stroke-width: 1.6; }
.nt-beatline { stroke: #eef0f3; stroke-width: 1; }
.nt-head { fill: #232936; }
.nt-ghost-head { fill: #7b828f; }
.nt-x { stroke: #232936; stroke-width: 1.7; stroke-linecap: round; }
.nt-open { fill: none; stroke: #232936; stroke-width: 1.4; }
.nt-ledger { stroke: #232936; stroke-width: 1.1; }
.nt-stem { stroke: #232936; stroke-width: 1.3; }
.nt-beam { fill: #232936; }
.nt-accent { fill: none; stroke: var(--blue); stroke-width: 2.3; stroke-linecap: round; stroke-linejoin: round; }
.nt-paren { font-size: 11px; fill: #7b828f; text-anchor: middle; }
.nt-count { font-size: 10px; fill: #9aa1ac; text-anchor: middle; }
.nt-count-beat { font-size: 12px; fill: #454c59; font-weight: 700; }
.nt-stick { font-size: 11px; fill: var(--blue-deep); text-anchor: middle; font-weight: 700; }
.nt-lyric { font-size: 12px; fill: #2a3038; text-anchor: start; font-weight: 600; }
.nt-rest { fill: #232936; }
.nt-rest-stroke { fill: none; stroke: #232936; stroke-linecap: round; stroke-linejoin: miter; }
.nt-tie { fill: none; stroke: #454c59; stroke-width: 1.5; }
.nt-grace { fill: #232936; }
.nt-grace-stem { stroke: #232936; stroke-width: 1.1; stroke-linecap: round; }
.nt-flag { fill: #232936; }
.nt-dot { fill: #232936; }
.nt-clef { fill: #232936; }
.nt-timesig { font-size: 19px; font-weight: 800; fill: #232936; text-anchor: middle; font-variant-numeric: tabular-nums; }
.nt-barnum { font-size: 10.5px; font-weight: 700; fill: #8b95a1; text-anchor: start; font-variant-numeric: tabular-nums; }
.nt-barline-thin { stroke: #454c59; stroke-width: 1; }
#playhead { fill: rgba(49, 130, 246, 0.13); }

/* ── 컨트롤 ── */
/* 긴 악보를 내려 보는 동안에도 재생 단추가 화면 아래에 붙어 따라온다 */
.controls {
  position: sticky;
  bottom: 12px;
  z-index: 5;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  background: var(--card);
  border-radius: var(--r-card);
  box-shadow: var(--sh-sm);
  padding: 16px 20px;
}
/* 한 번 정하면 되는 것(사운드·PDF·완료)은 따라오지 않는 아래 줄에 둔다 */
.controls-more {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 0 6px;
}
.play-btn {
  font-size: 16px;
  font-weight: 800;
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: 16px;
  padding: 13px 36px;
  cursor: pointer;
  box-shadow: 0 4px 0 var(--blue-deep);
  transition: transform 0.08s, box-shadow 0.08s, background 0.15s;
}
.play-btn:hover { background: #3d8bf8; }
.play-btn:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--blue-deep); }
.play-btn.playing {
  background: var(--gray-fill);
  color: var(--gray);
  box-shadow: 0 4px 0 #d6dade;
}

.bpm-box { display: flex; flex-direction: column; gap: 5px; min-width: 200px; }
.bpm-box label { font-size: 13px; font-weight: 600; color: var(--gray2); }
.bpm-box strong { color: var(--blue-deep); font-size: 15px; font-variant-numeric: tabular-nums; }
.bpm-box input[type="range"] { accent-color: var(--blue); width: 100%; }

.toggles { display: flex; gap: 14px; flex-wrap: wrap; }
.toggles label {
  font-size: 13px;
  font-weight: 600;
  color: var(--gray);
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}
.toggles input { accent-color: var(--blue); width: 16px; height: 16px; }

.kit-select { display: flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; color: var(--gray2); }
.kit-select select {
  font-size: 13px;
  font-weight: 700;
  font-family: inherit;
  color: var(--ink);
  background: var(--gray-fill);
  border: none;
  border-radius: 12px;
  padding: 9px 14px;
  cursor: pointer;
}

.done-btn {
  margin-left: auto;
  font-size: 13.5px;
  font-weight: 700;
  background: var(--gray-fill);
  border: none;
  color: var(--gray);
  border-radius: 999px;
  padding: 11px 22px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.done-btn:hover { background: var(--blue-soft); color: var(--blue-deep); }
.done-btn.is-done { background: var(--blue); color: #fff; }

/* ── 팁 ── */
.tips-box {
  background: var(--card);
  border-radius: var(--r-card);
  box-shadow: var(--sh-sm);
  padding: 18px 22px;
}
.tips-box h3 { font-size: 14px; font-weight: 800; color: var(--blue); margin-bottom: 8px; }
.tips-box ul { padding-left: 18px; }
.tips-box li { font-size: 14px; margin-bottom: 5px; color: var(--gray); }
.tips-box li::marker { color: var(--blue); }

.hint { font-size: 12.5px; color: var(--gray2); text-align: center; }

/* ── 음원을 악보로 ── */
#transcribeView { max-width: 720px; margin: 0 auto; padding: 40px clamp(20px, 4vw, 44px) 80px; }
.transcribe-box {
  background: var(--card);
  border-radius: 24px;
  box-shadow: var(--sh-sm);
  padding: clamp(26px, 4vw, 44px);
}
.transcribe-box h2 { font-size: 30px; font-weight: 800; letter-spacing: -0.03em; margin: 16px 0 6px; }
.steps { margin: 18px 0 24px 20px; display: flex; flex-direction: column; gap: 10px; font-size: 15px; color: var(--gray); }
.steps li::marker { color: var(--blue); font-weight: 800; }
.paste-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }
.paste-row input {
  flex: 1;
  min-width: 220px;
  font-size: 14px;
  font-family: inherit;
  color: var(--ink);
  background: var(--gray-fill);
  border: 2px solid transparent;
  border-radius: var(--r-btn);
  padding: 13px 18px;
  transition: border-color 0.15s, background 0.15s;
}
.paste-row input:focus { outline: none; border-color: var(--blue); background: #fff; }
.paste-row input::placeholder { color: var(--gray2); }
.paste-row button {
  font-size: 14.5px;
  font-weight: 800;
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: var(--r-btn);
  padding: 13px 26px;
  cursor: pointer;
  box-shadow: 0 4px 0 var(--blue-deep);
  transition: transform 0.08s, box-shadow 0.08s;
}
.paste-row button:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--blue-deep); }

/* ── 푸터 ── */
.footer { max-width: 1080px; margin: 0 auto; padding: 8px clamp(20px, 4vw, 44px) 48px; }
.footer p:first-child { font-weight: 800; letter-spacing: -0.02em; color: var(--gray); }
.footer-sub { font-size: 13px; color: var(--gray2); margin-top: 2px; }

/* ── 모션 최소화 ── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .home-brand, .home-tag, .widgets, .kit-stage { animation: none; }
  .kit-piece.hit { animation: none; filter: brightness(1.6); }
  .widget, .play-btn, .done-btn, .back-home { transition: none; }
}

/* ── 모바일 ── */
@media (max-width: 860px) {
  .topnav a { padding: 8px 11px; font-size: 13.5px; }
  .widgets { grid-template-columns: 1fr; grid-template-rows: auto; }
  .widget-main { grid-row: auto; min-height: 220px; }
  .layout { grid-template-columns: 1fr; gap: 16px; padding: 16px 14px 56px; }
  .sidebar { position: static; }
  .lesson-head h2 { font-size: 23px; }
  .done-btn { margin-left: 0; }
  .controls { gap: 10px 14px; padding: 12px 14px; bottom: 8px; }
  .play-btn { padding: 11px 26px; font-size: 15px; }
  .bpm-box { min-width: 0; flex: 1 1 130px; }
  .toggles { gap: 10px; }
  .notation-wrap { padding: 12px 4px; }
}

/* PDF 저장 버튼 */
.pdf-btn {
  margin-left: auto;
  font-size: 13.5px;
  font-weight: 700;
  background: var(--blue-soft);
  border: none;
  color: var(--blue-deep);
  border-radius: 999px;
  padding: 11px 22px;
  cursor: pointer;
  transition: background 0.15s;
}
.pdf-btn:hover { background: #d8e8fd; }
.done-btn { margin-left: 0; }

/* 인쇄 시트 */
#printSheet { display: none; }
@media print {
  body > *:not(#printSheet) { display: none !important; }
  #printSheet { display: block !important; }
  #printSheet h1 { font-size: 22pt; letter-spacing: -0.02em; margin-bottom: 2pt; }
  #printSheet p { font-size: 10pt; color: #555; margin-bottom: 14pt; }
  #printSheet svg { width: 100%; height: auto; page-break-inside: avoid; margin-bottom: 6pt; }
}

.link-error {
  font-size: 13px;
  font-weight: 600;
  color: #e0433f;
  background: #fdeceb;
  border-radius: 12px;
  padding: 10px 16px;
  margin-bottom: 10px;
}

/* 실시간 채보 폼 */
.gate-box, .chaebo-form { margin-top: 18px; }
.gate-box label, .chaebo-form label { display: block; font-size: 13px; font-weight: 700; color: var(--gray); margin-bottom: 6px; }
.chaebo-form #ytUrlInput {
  width: 100%;
  font-size: 14px;
  font-family: inherit;
  color: var(--ink);
  background: var(--gray-fill);
  border: 2px solid transparent;
  border-radius: var(--r-btn);
  padding: 13px 18px;
  margin-bottom: 14px;
}
.chaebo-form #ytUrlInput:focus { outline: none; border-color: var(--blue); background: #fff; }
.chaebo-row { display: flex; gap: 18px; align-items: center; margin-bottom: 14px; flex-wrap: wrap; }
.chaebo-check { display: flex; align-items: center; gap: 6px; font-size: 13.5px; font-weight: 600; color: var(--gray); cursor: pointer; }
.chaebo-row input[type='number'] {
  font-family: inherit;
  font-size: 13px;
  border: none;
  background: var(--gray-fill);
  border-radius: 8px;
  padding: 6px 8px;
  margin-left: 6px;
}
.cta-solid {
  font-size: 15px;
  font-weight: 800;
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: var(--r-btn);
  padding: 13px 28px;
  cursor: pointer;
  box-shadow: 0 4px 0 var(--blue-deep);
  transition: transform 0.08s, box-shadow 0.08s;
}
.cta-solid:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--blue-deep); }
.cta-solid:disabled { opacity: 0.6; cursor: default; }

.progress-box { display: flex; align-items: center; gap: 12px; margin-top: 16px; font-size: 14px; color: var(--gray); }
.spinner {
  width: 20px; height: 20px;
  border: 3px solid var(--blue-soft);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.result-box {
  margin-top: 16px;
  background: #e6f6ef;
  border-radius: var(--r-btn);
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.result-box p { font-size: 14px; font-weight: 700; color: #1a7a4c; }

.manual-fallback { margin-top: 22px; }
.manual-fallback summary {
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--gray2);
}
.manual-fallback .paste-row { margin-top: 10px; }