:root{--brand-50: #eef4ff;--brand-100: #dbe6ff;--brand-200: #bcd0ff;--brand-300: #8fb0ff;--brand-400: #5c86fb;--brand-500: #3b64f0;--brand-600: #2a4bd6;--brand-700: #233bad;--brand-900: #16265f;--accent-400: #ffb340;--accent-500: #f59300;--ink-900: #10131a;--ink-800: #1c2029;--ink-700: #2c3240;--ink-600: #454d5e;--ink-500: #5f6878;--ink-400: #858d9c;--ink-300: #b3b9c4;--ink-200: #d8dce3;--ink-100: #eceef2;--ink-50: #f6f7f9;--white: #fff;--ok-500: #12a065;--ok-50: #e7f7ef;--warn-500: #d98016;--warn-50: #fdf3e3;--danger-500: #d84a4a;--danger-50: #fdeded;--info-500: #2b7fd4;--info-50: #e9f3fc;--bg: var(--white);--bg-soft: var(--ink-50);--surface: var(--white);--border: var(--ink-200);--border-soft: var(--ink-100);--font: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, "Segoe UI", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;--font-mono: "SFMono-Regular", ui-monospace, Menlo, Consolas, "D2Coding", monospace;--fs-hero: clamp(2.1rem, 6vw, 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0;font-size:var(--fs-sm);color:var(--ink-500)}.practice{border:1px solid var(--border-soft);border-left:4px solid var(--brand-500);border-radius:var(--r-md);padding:var(--sp-4) var(--sp-5);background:var(--white)}.practice+.practice{margin-top:var(--sp-4)}.practice-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.practice-no{font-size:var(--fs-xs);font-weight:900;letter-spacing:.07em;color:var(--brand-700);background:var(--brand-50);padding:3px 10px;border-radius:var(--r-full)}.practice-title{font-size:1rem;color:var(--ink-900)}.practice-body{margin-top:10px;color:var(--ink-700);font-size:.95rem}.practice-body p{margin:6px 0}.practice-hint{margin-top:10px;font-size:var(--fs-sm);color:var(--ink-500)}.practice-toggle{margin-top:14px;padding:7px 16px;border-radius:var(--r-full);border:1px solid var(--brand-200);background:var(--brand-50);color:var(--brand-700);font-size:var(--fs-sm);font-weight:800;display:inline-flex;align-items:center;gap:7px}.practice-toggle:before{content:"▸";font-size:.8em;transition:transform .16s}.practice-toggle.is-open:before{transform:rotate(90deg)}.practice-toggle:hover{background:var(--brand-100)}.practice-answer{margin-top:14px}.practice-note{margin-top:12px;font-size:var(--fs-sm);color:var(--ink-600)}.tbl-sm{min-width:380px;font-size:var(--fs-sm)}.tbl-sm th,.tbl-sm td{padding:9px 12px}.period{display:inline-flex;align-items:center;gap:8px;font-size:var(--fs-xs);font-weight:900;letter-spacing:.08em;color:var(--brand-700);background:var(--brand-50);padding:5px 12px;border-radius:var(--r-full);margin-bottom:10px}.q-code{margin:8px 0;padding:12px 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var(--border-soft)}.nav{height:var(--nav-h);display:flex;align-items:center;justify-content:space-between;gap:var(--sp-4)}.brand{display:flex;align-items:center;gap:10px;font-weight:900;letter-spacing:-.03em}.brand-mark{width:32px;height:32px;border-radius:9px;display:grid;place-items:center;background:linear-gradient(135deg,var(--brand-500),var(--brand-700));color:#fff;font-size:.82rem;font-weight:900;flex:none}.brand-text{display:flex;flex-direction:column;line-height:1.15}.brand-title{font-size:.95rem;color:var(--ink-900)}.brand-sub{font-size:.68rem;font-weight:700;color:var(--ink-400);letter-spacing:.02em}.nav-links{display:flex;align-items:center;gap:2px}.nav-link{padding:7px 11px;border-radius:var(--r-sm);font-size:.875rem;font-weight:700;color:var(--ink-600);white-space:nowrap;transition:all 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em{font-style:normal;color:var(--accent-400)}.hero-sub{font-size:clamp(1rem,2.2vw,1.16rem);color:#ffffffdb;max-width:640px}.hero-meta{display:flex;flex-wrap:wrap;gap:10px}.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--sp-4);margin-top:var(--sp-7)}@media(max-width:720px){.hero-stats{grid-template-columns:repeat(2,1fr)}}.hero-stat{padding:18px;border-radius:var(--r-lg);background:#ffffff17;border:1px solid rgba(255,255,255,.16)}.hero-stat-num{font-size:1.65rem;font-weight:900;color:#fff;line-height:1.2}.hero-stat-label{font-size:var(--fs-xs);color:#ffffffb3;font-weight:700}.section-head{max-width:720px;margin-bottom:var(--sp-6)}.section-head h2{font-size:var(--fs-h1)}.section-head p{margin-top:10px;color:var(--ink-500);font-size:1.02rem}.section-head--center{margin-left:auto;margin-right:auto;text-align:center}.timeline{position:relative;padding-left:30px}.timeline:before{content:"";position:absolute;left:9px;top:8px;bottom:8px;width:2px;background:linear-gradient(var(--brand-300),var(--border-soft))}.tl-item{position:relative;padding-bottom:var(--sp-5)}.tl-item:last-child{padding-bottom:0}.tl-dot{position:absolute;left:-30px;top:4px;width:20px;height:20px;border-radius:50%;background:var(--white);border:3px solid var(--brand-500);display:grid;place-items:center;font-size:.6rem;font-weight:900;color:var(--brand-700)}.tl-dot--break{border-color:var(--ink-300);color:var(--ink-400)}.tl-time{font-size:var(--fs-xs);font-weight:800;color:var(--brand-600);letter-spacing:.02em}.tl-title{font-weight:800;color:var(--ink-900);margin-top:2px}.tl-desc{font-size:var(--fs-sm);color:var(--ink-500);margin-top:3px}.checklist{display:flex;flex-direction:column;gap:8px}.check-item{display:flex;align-items:flex-start;gap:12px;width:100%;text-align:left;padding:13px 16px;border-radius:var(--r-md);border:1px solid var(--border-soft);background:var(--white);transition:all .15s;color:var(--ink-700);font-size:.95rem;line-height:1.6}.check-item:hover{border-color:var(--brand-300);background:var(--brand-50)}.check-item.is-done{background:var(--ok-50);border-color:#b6e3cd;color:var(--ink-500)}.check-item.is-done .check-label{text-decoration:line-through}.check-box{flex:none;width:22px;height:22px;border-radius:7px;margin-top:1px;border:2px solid var(--ink-300);display:grid;place-items:center;font-size:.74rem;color:#fff;font-weight:900}.check-item.is-done .check-box{background:var(--ok-500);border-color:var(--ok-500)}.check-label{flex:1}.progress-bar{height:9px;border-radius:var(--r-full);background:var(--ink-100);overflow:hidden}.progress-fill{height:100%;border-radius:var(--r-full);background:linear-gradient(90deg,var(--brand-500),var(--brand-700));transition:width .4s cubic-bezier(.22,.8,.3,1)}.accordion{border:1px solid var(--border-soft);border-radius:var(--r-md);overflow:hidden;background:var(--white)}.acc-item+.acc-item{border-top:1px solid var(--border-soft)}.acc-head{width:100%;display:flex;align-items:center;justify-content:space-between;gap:14px;padding:16px 18px;background:none;border:none;text-align:left;font-weight:700;color:var(--ink-800);font-size:.97rem}.acc-head:hover{background:var(--ink-50)}.acc-icon{flex:none;color:var(--brand-600);font-size:1.15rem;transition:transform .2s}.acc-head[aria-expanded=true] .acc-icon{transform:rotate(45deg)}.acc-body{padding:0 18px 18px;color:var(--ink-600);font-size:.95rem}.gallery-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--sp-4)}@media(max-width:940px){.gallery-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:600px){.gallery-grid{grid-template-columns:1fr}}.gal-card{display:flex;flex-direction:column;overflow:hidden;padding:0}.gal-thumb{aspect-ratio:16 / 10;display:grid;place-items:center;position:relative;font-size:2.6rem;color:#fff;border-bottom:1px solid var(--border-soft)}.gal-thumb-tag{position:absolute;top:10px;right:10px;padding:3px 10px;border-radius:var(--r-full);font-size:var(--fs-xs);font-weight:800;background:#0006;color:#fff;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.gal-body{padding:var(--sp-4);display:flex;flex-direction:column;gap:8px;flex:1}.gal-title{font-weight:800;font-size:1rem;color:var(--ink-900)}.gal-desc{font-size:var(--fs-sm);color:var(--ink-500);flex:1}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:200;background:#0a0e189e;display:grid;place-items:center;padding:20px;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px)}.modal{width:min(920px,100%);max-height:88vh;overflow:auto;background:var(--white);border-radius:var(--r-xl);box-shadow:var(--sh-lg)}.modal-head{position:sticky;top:0;background:var(--white);z-index:2;display:flex;align-items:flex-start;justify-content:space-between;gap:16px;padding:22px 24px 14px;border-bottom:1px solid var(--border-soft)}.modal-body{padding:22px 24px 26px}.modal-close{flex:none;width:36px;height:36px;border-radius:50%;border:1px solid var(--border);background:var(--white);font-size:1.05rem;color:var(--ink-500)}.modal-close:hover{background:var(--ink-50);color:var(--ink-900)}.lesson-row{display:flex;align-items:center;gap:14px;padding:13px 16px;border-radius:var(--r-md);border:1px solid var(--border-soft);background:var(--white);transition:all 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