/* ============================================================================
   스파르타 — 전면 리디자인 (20260704) · 통일 디자인
   낡은 셸 CSS 제거. 겹침 버그 수정(pause-overlay는 workspace 기준 absolute).
   JS의 모든 id/onclick/클래스(correct, incorrect, pacemaker-cursor 등) 유지.
   ========================================================================== */
:root {
  --ink:#171a2b; --text:#3a3f55; --muted:#767b92; --faint:#a2a7bb;
  --line:#e7e9f1; --line-strong:#d7dae6; --paper:#f4f5f9; --card:#fff; --wash:#fafafd;
  --violet:#5b3df0; --violet-deep:#4529ce; --violet-tint:#efecfe; --violet-wash:#f8f7ff;
  --green:#0e8a63; --green-tint:#e6f5ef; --amber:#b45309; --amber-tint:#fdf3e7;
  --red:#c2453f; --red-tint:#fdeceb;
  --r-ctl:10px; --r-card:16px;
  --shadow-card:0 10px 30px rgba(23,26,43,.05); --shadow-pop:0 22px 60px rgba(23,26,43,.22);
  --sidebar-width:240px;
  --font-sans:Pretendard,"Apple SD Gothic Neo",-apple-system,BlinkMacSystemFont,"Segoe UI","Malgun Gothic",sans-serif;
  --font-num:"Space Grotesk",Pretendard,sans-serif;
  --primary:#5b3df0; --text-dark:#171a2b;
}
* { box-sizing:border-box; }
html,body { min-height:100%; }
body { margin:0; padding:0; font-family:var(--font-sans); color:var(--text); background:var(--paper); letter-spacing:-0.02em; overflow:hidden; display:flex; }
button,input,textarea,select { font:inherit; color:inherit; }
button { cursor:pointer; }
:focus-visible { outline:3px solid rgba(91,61,240,.28); outline-offset:2px; }
a { color:inherit; text-decoration:none; }
svg { display:block; width:1em; height:1em; fill:none; stroke:currentColor; stroke-width:1.75; stroke-linecap:round; stroke-linejoin:round; }
.num { font-family:var(--font-num); font-variant-numeric:tabular-nums; letter-spacing:-0.01em; }
.page-eyebrow { display:inline-block; color:var(--violet); font-size:11px; font-weight:800; letter-spacing:.14em; }
.btn-ico { display:inline-flex; font-size:15px; }
kbd { font-family:var(--font-num); font-size:10px; font-weight:700; padding:2px 6px; border:1px solid rgba(255,255,255,.4); border-radius:5px; background:rgba(255,255,255,.15); }

.main-content { flex:1; min-width:0; height:100vh; overflow-y:auto; padding:34px clamp(20px,3.2vw,44px) 44px; }

/* 사이드바 */
.sidebar { position:sticky; top:0; z-index:30; display:flex; flex-direction:column; gap:14px; width:var(--sidebar-width); height:100vh; padding:22px 14px 16px; border-right:1px solid var(--line); background:var(--card); overflow-y:auto; flex-shrink:0; }
.sidebar-top { display:flex; align-items:center; justify-content:space-between; padding:0 6px; }
.logo { display:flex; align-items:center; gap:8px; margin:0; color:var(--ink); font-size:16px; font-weight:800; letter-spacing:-0.03em; }
.sidebar-close-btn,.mobile-menu-btn { display:none; border:0; background:transparent; color:var(--ink); }
.nav-list.nav-groups { display:grid; gap:4px; align-content:start; flex:1; }
.nav-section { border:0; }
.nav-section-title { display:flex; align-items:center; justify-content:space-between; padding:9px 8px 5px; color:var(--faint); font-size:10.5px; font-weight:800; letter-spacing:.08em; list-style:none; cursor:pointer; }
.nav-section-title::-webkit-details-marker { display:none; }
.nav-section-arrow { font-size:12px; transition:transform .18s ease; }
.nav-section[open] .nav-section-arrow { transform:rotate(180deg); }
.nav-section-list { display:grid; gap:1px; }
.nav-item { display:flex; align-items:center; gap:9px; min-height:36px; padding:6px 10px; border-radius:9px; color:var(--text); font-size:13px; font-weight:500; transition:background-color .13s ease,color .13s ease; }
.nav-item:hover { background:var(--wash); color:var(--ink); }
.nav-item.active { color:var(--violet-deep); background:var(--violet-tint); font-weight:700; }
.nav-icon { width:18px; text-align:center; font-size:14px; filter:grayscale(.25); }
.nav-item.active .nav-icon { filter:none; }
.ai-nav-highlight .nav-text { background:linear-gradient(90deg,var(--violet),#8a6cf8); -webkit-background-clip:text; background-clip:text; color:transparent; font-weight:700; }
.sidebar-footer { display:grid; gap:8px; }
.profile-card { display:flex; align-items:center; gap:10px; padding:10px; border:1px solid var(--line); border-radius:12px; background:var(--card); cursor:pointer; transition:border-color .15s ease; }
.profile-card:hover { border-color:var(--line-strong); }
.avatar { display:grid; place-items:center; width:34px; height:34px; border-radius:50%; color:var(--violet-deep); background:var(--violet-tint); font-weight:800; font-size:13px; }
.profile-name { color:var(--ink); font-size:13px; font-weight:700; }
.profile-action { color:var(--faint); font-size:11px; }
.admin-trigger { min-height:34px; border:1px dashed var(--line-strong); border-radius:10px; color:var(--muted); background:transparent; font-size:12px; }
.sidebar-overlay { display:none; }

/* 셸 */
.sp-shell { display:grid; gap:16px; }

/* 헤더 */
.sp-header { display:flex; align-items:flex-start; justify-content:space-between; gap:20px; flex-wrap:wrap; }
.sp-title-area h2 { display:flex; align-items:center; gap:10px; margin:6px 0 0; color:var(--ink); font-size:clamp(23px,2vw,30px); font-weight:800; letter-spacing:-0.04em; }
.sp-badge-v2 { font-family:var(--font-num); font-size:13px; font-weight:700; color:var(--violet-deep); background:var(--violet-tint); padding:3px 9px; border-radius:7px; letter-spacing:.02em; }
.sp-title-area p { display:flex; align-items:center; gap:8px; margin:10px 0 0; color:var(--muted); font-size:13px; font-weight:600; }
.sp-title-area p i { color:var(--line-strong); font-style:normal; }

/* 버튼 공통 */
.sp-btn { display:inline-flex; align-items:center; justify-content:center; gap:7px; min-height:42px; padding:0 16px; border:1px solid var(--line-strong); border-radius:var(--r-ctl); color:var(--text); background:var(--card); font-size:13px; font-weight:700; transition:border-color .14s ease,background-color .14s ease,color .14s ease; }
.sp-btn:hover { border-color:var(--violet); color:var(--violet); background:var(--violet-wash); }
.sp-btn-primary { border-color:transparent; color:#fff; background:var(--violet); }
.sp-btn-primary:hover { background:var(--violet-deep); color:#fff; }
.sp-logout:hover { border-color:var(--red); color:var(--red); background:var(--red-tint); }

/* 안내 (접이식, 기본 닫힘) */
.sp-guide { border:1px solid var(--line); border-radius:var(--r-card); background:var(--card); box-shadow:var(--shadow-card); overflow:hidden; }
.sp-guide-summary { display:flex; align-items:center; gap:10px; padding:14px 18px; cursor:pointer; list-style:none; color:var(--ink); font-size:13.5px; font-weight:700; }
.sp-guide-summary::-webkit-details-marker { display:none; }
.sp-guide-icon { display:grid; place-items:center; width:26px; height:26px; flex:none; border-radius:8px; color:var(--amber); background:var(--amber-tint); font-size:15px; }
.sp-guide-chevron { margin-left:auto; color:var(--faint); font-size:14px; transition:transform .18s ease; }
.sp-guide[open] .sp-guide-chevron { transform:rotate(180deg); }
.sp-guide[open] .sp-guide-summary { border-bottom:1px solid var(--line); }
.sp-guide-copy { padding:14px 18px 16px 54px; }
.sp-guide-copy p { margin:0; color:var(--muted); font-size:13px; line-height:1.6; }
.sp-guide-copy b { color:var(--amber); font-weight:800; }

/* 워크스페이스 (pause-overlay 기준 컨테이너) */
.sp-workspace { position:relative; display:grid; gap:16px; padding:22px; border:1px solid var(--line); border-radius:var(--r-card); background:var(--card); box-shadow:var(--shadow-card); }

/* 일시정지 오버레이 (기본 숨김, JS가 flex로 표시) */
#pause-overlay { display:none; position:absolute; inset:0; z-index:20; align-items:center; justify-content:center; border-radius:var(--r-card); background:rgba(244,245,249,.82); backdrop-filter:blur(4px); }
.sp-pause-inner { display:grid; gap:16px; justify-items:center; }
.sp-pause-msg { display:flex; align-items:center; gap:8px; color:var(--ink); font-size:22px; font-weight:800; }
.sp-resume-btn { display:inline-flex; align-items:center; gap:10px; min-height:48px; padding:0 26px; border:0; border-radius:var(--r-ctl); color:#fff; background:var(--violet); font-size:15px; font-weight:700; box-shadow:0 10px 24px rgba(91,61,240,.24); }
.sp-resume-btn:hover { background:var(--violet-deep); }
.sp-resume-btn kbd { color:#fff; }

/* 컨트롤 툴바 */
.sp-controls { display:flex; align-items:center; justify-content:space-between; gap:14px; flex-wrap:wrap; }
.sp-controls-left { display:flex; align-items:center; gap:10px; flex-wrap:wrap; }
.sp-field { display:inline-flex; align-items:center; gap:8px; height:42px; padding:0 12px; border:1px solid var(--line-strong); border-radius:var(--r-ctl); background:var(--card); }
.sp-field-label { color:var(--muted); font-size:12.5px; font-weight:700; }
.sp-field select { border:0; background:transparent; color:var(--ink); font-size:13px; font-weight:700; outline:none; cursor:pointer; }
.sp-field.compact { gap:4px; }
.sp-field input[type=number] { width:56px; border:0; background:transparent; color:var(--ink); font-family:var(--font-num); font-size:14px; font-weight:700; text-align:center; outline:none; }
.sp-field.compact span { color:var(--muted); font-size:12.5px; }
.sp-file-btn { min-height:42px; cursor:pointer; }

/* 페이스메이커 */
.sp-pacemaker { display:inline-flex; align-items:center; gap:12px; padding:8px 14px; border:1px solid #d8cffb; border-radius:var(--r-ctl); background:var(--violet-wash); }
.sp-pacemaker-title { display:inline-flex; align-items:center; gap:6px; color:var(--violet-deep); font-size:13px; font-weight:700; }
.sp-switch { position:relative; width:42px; height:24px; flex:none; }
.sp-switch input { position:absolute; opacity:0; width:100%; height:100%; margin:0; cursor:pointer; }
.sp-slider { position:absolute; inset:0; border-radius:999px; background:var(--line-strong); transition:background-color .18s ease; }
.sp-slider::before { content:''; position:absolute; top:2px; left:2px; width:20px; height:20px; border-radius:50%; background:#fff; box-shadow:0 1px 3px rgba(23,26,43,.25); transition:transform .18s ease; }
.sp-switch input:checked + .sp-slider { background:var(--violet); }
.sp-switch input:checked + .sp-slider::before { transform:translateX(18px); }
.sp-pause-btn { width:44px; padding:0; flex:none; }

/* 진행률 */
.sp-progress { display:grid; gap:8px; }
.sp-progress-row { display:flex; align-items:center; justify-content:space-between; color:var(--muted); font-size:12px; font-weight:700; }
.sp-progress-row b { color:var(--violet-deep); font-size:14px; }
.sp-progress-track { height:10px; border-radius:999px; background:var(--wash); border:1px solid var(--line); overflow:hidden; }
.sp-progress-bar { height:100%; width:0%; border-radius:999px; background:linear-gradient(90deg,var(--violet),var(--violet-deep)); transition:width .25s ease; }

/* 계측 카드 (슬림 스트립 · 보조 정보) */
.sp-stats { display:grid; grid-template-columns:repeat(4,1fr); gap:0; border:1px solid var(--line); border-radius:var(--r-card); background:var(--card); overflow:hidden; }
.sp-stat { display:flex; align-items:center; gap:12px; padding:14px 18px; border-left:1px solid var(--line); }
.sp-stat:first-child { border-left:0; }
.sp-stat-head { display:flex; align-items:center; gap:7px; margin-bottom:0; flex:none; }
.sp-stat-ico { display:grid; place-items:center; width:30px; height:30px; flex:none; border-radius:8px; color:var(--muted); background:var(--wash); font-size:15px; }
.sp-stat-accent { background:var(--violet-wash); }
.sp-stat-accent .sp-stat-ico { color:var(--violet); background:var(--violet-tint); }
.sp-stat-label { color:var(--muted); font-size:12.5px; font-weight:700; }
.sp-stat-value { display:flex; align-items:baseline; gap:3px; color:var(--ink); margin-left:auto; }
.sp-stat-value .num { font-size:1.5rem; font-weight:700; line-height:1; }
.sp-stat-accent .sp-stat-value .num { color:var(--violet); }
.sp-stat-value small { color:var(--faint); font-size:11px; font-weight:700; }

/* 연습 문장 (주인공) */
.sp-target-section { }
.sp-target-box { min-height:150px; padding:32px; border:1px solid var(--line-strong); border-radius:var(--r-card); background:var(--wash); font-size:1.7rem; line-height:2.1; color:var(--muted); font-weight:600; word-break:break-all; letter-spacing:.01em; }
.sp-target-box:empty::before { content:'파일을 불러오거나 입력을 시작하세요.'; color:var(--faint); font-size:1.15rem; font-weight:600; }
.sp-target-box .correct { color:var(--ink); font-weight:800; }
.sp-target-box .incorrect { color:var(--red); font-weight:800; background:var(--red-tint); border-radius:4px; }
.sp-target-box .pacemaker-cursor { color:var(--violet-deep); background:var(--violet-tint); border-radius:4px; box-shadow:inset 0 -3px 0 var(--violet); }

/* 입력 */
.sp-input-section { display:grid; gap:12px; }
#input-field { width:100%; padding:20px 24px; border:2px solid var(--violet); border-radius:var(--r-card); background:var(--card); color:var(--ink); font-size:1.4rem; outline:none; box-shadow:0 6px 20px rgba(91,61,240,.08); transition:box-shadow .15s ease; }
#input-field:focus { box-shadow:0 0 0 4px rgba(91,61,240,.14); }
#input-field::placeholder { color:var(--faint); font-size:1.15rem; }
.sp-help { display:flex; align-items:center; gap:10px; padding:12px 16px; border-radius:var(--r-ctl); background:var(--violet-wash); color:var(--violet-deep); font-size:13px; font-weight:600; }
.sp-help .btn-ico { font-size:17px; }
.sp-help p { margin:0; }

/* 반응형 */
@media (max-width:1100px) { .sp-stats { grid-template-columns:repeat(2,1fr); } .sp-stat:nth-child(3),.sp-stat:nth-child(4) { border-top:1px solid var(--line); } .sp-stat:nth-child(3) { border-left:0; } }
@media (max-width:980px) {
  .main-content { width:100%; padding:76px clamp(14px,3vw,24px) 32px; }
  .sidebar { position:fixed; inset:0 auto 0 0; z-index:50; transform:translateX(-102%); transition:transform .22s ease; box-shadow:var(--shadow-pop); }
  .sidebar.active { transform:translateX(0); }
  .sidebar-close-btn { display:grid; place-items:center; width:32px; height:32px; font-size:20px; color:var(--muted); }
  .sidebar-overlay { position:fixed; z-index:40; inset:0; display:block; visibility:hidden; background:rgba(18,19,36,.35); opacity:0; transition:opacity .2s ease,visibility .2s ease; }
  .sidebar-overlay.active { visibility:visible; opacity:1; }
  .mobile-menu-btn { position:fixed; z-index:35; top:14px; left:14px; display:grid; place-items:center; width:42px; height:42px; border:1px solid var(--line); border-radius:12px; color:var(--violet); background:var(--card); box-shadow:var(--shadow-card); font-size:19px; }
}
@media (max-width:640px) {
  .sp-header { flex-direction:column; }
  .sp-controls { flex-direction:column; align-items:stretch; }
  .sp-controls-left { flex-direction:column; align-items:stretch; }
  .sp-stats { grid-template-columns:1fr 1fr; }
  .sp-target-box { font-size:1.3rem; }
}
@media (prefers-reduced-motion:reduce) { *,*::before,*::after { transition:none !important; animation:none !important; } }