:root{--bg: #f5f7f2;--surface: #ffffff;--surface-2: #eef3ed;--ink: #1f2933;--muted: #657282;--line: #d9e1d7;--accent: #2f6f73;--accent-dark: #24565a;--orange: #c46a22;--danger: #b54747;--shadow: 0 12px 28px rgba(31, 41, 51, .08)}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--bg);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input,textarea,select{font:inherit}button{cursor:pointer}.state-message{display:grid;min-height:100vh;place-items:center;color:var(--muted)}.app-shell{min-height:100vh}.topbar{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:76px;padding:14px 24px;border-bottom:1px solid var(--line);background:var(--surface)}.brand{display:flex;align-items:center;gap:12px;min-width:0}.brand-mark{display:grid;width:42px;height:42px;place-items:center;color:#fff;background:var(--accent);border-radius:8px}.brand h1{margin:0;font-size:22px;line-height:1.15}.brand p{margin:3px 0 0;color:var(--muted);font-size:14px}.learner-box{display:flex;align-items:center;gap:8px;padding:7px 10px;border:1px solid var(--line);border-radius:8px;background:var(--surface-2)}.learner-box label{color:var(--muted);font-size:13px}.learner-box input{width:120px;min-width:0;border:0;outline:0;color:var(--ink);background:transparent}.icon-button{display:inline-grid;width:30px;height:30px;place-items:center;border:1px solid var(--line);border-radius:8px;color:var(--muted);background:var(--surface)}.icon-button:hover{color:var(--accent-dark);border-color:var(--accent)}.login-screen{display:grid;min-height:100vh;place-items:center;padding:24px;background:var(--bg)}.login-card{width:min(420px,100%);padding:28px;border:1px solid var(--line);border-radius:8px;background:var(--surface);box-shadow:var(--shadow)}.login-card h1{margin:16px 0 6px;font-size:28px}.login-card p{margin:0 0 18px;color:var(--muted)}.login-card 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var(--line);border-radius:8px}@media(max-width:1080px){.workspace,.resource-layout{grid-template-columns:1fr}.sidebar{position:static;max-height:none;border-right:0;border-bottom:1px solid var(--line)}}@media(max-width:720px){.topbar{align-items:flex-start;flex-direction:column}.workspace{min-height:auto}.main-pane,.sidebar{padding:14px}.stats-strip,.review-grid{grid-template-columns:1fr}.lesson-heading,.section-heading{align-items:stretch;flex-direction:column}.flashcard span{font-size:30px}.chat-widget{right:14px;bottom:14px}.chat-panel{width:calc(100vw - 84px)}}