:root{--ink:#e9ebf3;--muted:#9aa1b3;--dim:#696f81;--bg:#0c0e15;--panel:#151824;--line:rgba(236,239,247,.11);--coral:#ff765d;--coral-soft:#ffb0a1;--green:#9de3bb;--shadow:0 22px 80px rgba(0,0,0,.24)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:"Noto Sans KR","Space Grotesk",sans-serif;font-size:16px;line-height:1.5}button{font:inherit;color:inherit;cursor:pointer;border:0;background:none}button:focus-visible{outline:2px solid var(--coral);outline-offset:3px}a{color:inherit;text-decoration:none}.app-shell{min-height:100vh;display:flex}.rail{width:260px;border-right:1px solid var(--line);padding:34px 22px 24px;display:flex;flex-direction:column;position:fixed;inset:0 auto 0 0;background:rgba(12,14,21,.94);z-index:5}.brand{display:flex;align-items:center;gap:11px;padding:0 12px;margin-bottom:64px}.brand-mark{width:30px;height:30px;display:grid;place-items:center;border:1px solid var(--coral);color:var(--coral);font-weight:800;font-family:"Space Grotesk";transform:rotate(-8deg)}.brand-word,.mobile-brand strong{font-family:"Space Grotesk";letter-spacing:.11em;font-weight:700;font-size:15px}.main-nav{display:grid;gap:8px}.nav-item{display:flex;align-items:center;gap:14px;text-align:left;padding:13px;color:var(--muted);border-radius:10px;transition:.2s}.nav-item:hover{background:rgba(255,255,255,.05);color:var(--ink)}.nav-item.is-active{background:#202331;color:var(--ink)}.nav-icon{font-family:"Space Grotesk";font-size:21px;width:21px;color:var(--coral)}.rail-bottom{margin-top:auto}.streak-card{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:18px 8px;display:flex;align-items:center;gap:10px;margin-bottom:16px}.streak-dot{width:8px;height:8px;border-radius:50%;background:var(--coral);box-shadow:0 0 15px var(--coral)}.streak-card div{display:grid;line-height:1.35;flex:1}.streak-card strong{font-size:13px}.streak-card 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56%;overflow:hidden}.card-image:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,12,18,.04),rgba(10,12,18,.64))}.card-image.study-art{background-image:url('/assets/study-desk.png')}.card-kicker{position:absolute;z-index:1;top:18px;left:20px;padding:5px 8px;border:1px solid rgba(255,255,255,.25);background:rgba(12,14,21,.48);backdrop-filter:blur(8px);font:10px "DM Mono";letter-spacing:.08em;color:#fff}.image-word{position:absolute;z-index:1;left:21px;bottom:19px;font:600 clamp(32px,5vw,55px)/1 "Space Grotesk";letter-spacing:-.06em}.image-word small{display:block;font:12px "DM Mono";letter-spacing:.08em;color:var(--coral-soft);margin-top:9px}.card-body{padding:22px 22px 18px}.definition-row{display:flex;justify-content:space-between;gap:15px}.definition-row h3{margin:0;font:600 24px "Space Grotesk";letter-spacing:-.04em}.pronounce{font:12px "DM Mono";color:var(--muted);margin:6px 0 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div:last-child{border:0}.profile-stats strong{font:28px "Space Grotesk"}.profile-stats span{font-size:11px;color:var(--muted)}.settings-card{max-width:680px;border:1px solid var(--line);border-radius:12px;padding:6px 20px;margin-top:24px}.settings-card>div{display:flex;align-items:center;padding:17px 0;border-bottom:1px solid var(--line)}.settings-card>div:last-child{border:0}.settings-card>div>div{display:grid;flex:1}.settings-card strong{font-size:13px}.settings-card span{font-size:11px;color:var(--muted);margin-top:4px}.toggle{width:39px;height:23px;border-radius:20px;background:#353947;padding:3px}.toggle i{display:block;width:17px;height:17px;border-radius:50%;background:#777e90;transition:.2s}.toggle.is-on{background:var(--coral)}.toggle.is-on i{transform:translateX(16px);background:#fff}.toast{position:fixed;bottom:25px;left:50%;transform:translate(-50%,20px);opacity:0;pointer-events:none;padding:11px 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95px}.topbar{height:70px}.mobile-brand{display:flex;align-items:center;gap:9px}.mobile-brand .brand-mark{width:25px;height:25px;font-size:13px}.topbar-context{display:none}.topbar-actions{gap:12px}.feed-heading{padding:40px 0 27px;align-items:start}.feed-heading h1{font-size:38px}.feed-heading .ghost-button{margin-top:5px;padding:8px 9px;font-size:11px}.category-tabs{overflow:auto;margin-right:-18px;padding-right:18px}.category-tab{white-space:nowrap;padding-left:10px;padding-right:10px}.category-tab.is-active:after{left:10px;right:10px}.feed-layout{display:block;padding-top:25px}.side-panel{display:none}.card-image{height:215px}.card-body{padding:19px 18px 16px}.definition-row h3{font-size:22px}.card-footer{gap:10px}.action-button{font-size:11px}.card-author{font-size:10px}.page-heading{padding:40px 0 28px}.page-heading h2{font-size:39px}.study-grid{grid-template-columns:1fr}.study-card{min-height:160px}.saved-summary{gap:18px;padding:15px}.saved-summary .primary-button{padding:9px 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