:root{--navy:#0b1f3a;--blue:#1d75d0;--sky:#eef6ff;--line:#dce6f1;--muted:#617084;--green:#17a673;--red:#d94949;--bg:#f5f8fc}*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Arial,sans-serif;background:var(--bg);color:var(--navy)}a{color:inherit}.auth-body{min-height:100vh;display:grid;place-items:center;padding:28px;background:radial-gradient(circle at top left,#e6f3ff,transparent 35%),var(--bg)}.auth-card{width:min(480px,100%);background:#fff;border:1px solid var(--line);border-radius:28px;padding:28px;box-shadow:0 26px 70px rgba(11,31,58,.12)}.auth-card.wide{width:min(780px,100%)}.auth-brand{display:flex;gap:12px;align-items:center;text-decoration:none;margin-bottom:18px}.auth-brand span{width:46px;height:46px;border-radius:16px;background:linear-gradient(135deg,var(--blue),#59b5ff);color:#fff;display:grid;place-items:center;font-weight:900}.auth-brand strong{display:grid}.auth-brand small{font-size:12px;color:var(--muted);font-weight:700}.auth-card h1,.student-hero h1{margin:.1rem 0 .4rem;font-size:clamp(28px,5vw,42px)}.auth-card p,.student-hero p,.course-card p{color:var(--muted);font-weight:650;line-height:1.55}.auth-card label{display:grid;gap:7px;margin:12px 0;font-weight:850}.auth-card input,.auth-card select{width:100%;border:1px solid var(--line);border-radius:15px;padding:13px 14px;font:inherit}.auth-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 14px}.auth-btn{border:0;border-radius:15px;background:var(--blue);color:#fff;font-weight:900;padding:13px 18px;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 12px 24px rgba(29,117,208,.22)}.auth-btn.secondary{background:#fff;color:var(--blue);border:1px solid #bcd7f2;box-shadow:none}.auth-btn.inline{align-self:center}.auth-card .auth-btn{width:100%;margin-top:10px}.auth-switch{text-align:center;margin-top:16px;color:var(--muted);font-weight:750}.auth-switch a{color:var(--blue);font-weight:900}.auth-alert{border-radius:15px;padding:12px 14px;margin:12px 0;font-weight:800}.auth-alert.error{background:#fff0f0;color:var(--red);border:1px solid #ffd4d4}.student-body{min-height:100vh}.student-top{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;padding:14px clamp(18px,5vw,54px)}.student-top nav{display:flex;gap:12px}.student-top nav a,.student-top>a{font-weight:900;text-decoration:none;color:var(--blue)}.student-main{padding:28px clamp(18px,5vw,54px);max-width:1200px;margin:auto}.student-hero{display:flex;justify-content:space-between;gap:18px;background:linear-gradient(135deg,#fff,#eef6ff);border:1px solid var(--line);border-radius:28px;padding:28px;margin-bottom:20px}.eyebrow{color:var(--blue);font-weight:950;text-transform:uppercase;letter-spacing:.08em;font-size:12px}.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.course-card,.lesson-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:20px;box-shadow:0 14px 34px rgba(11,31,58,.06)}.course-card h2,.lesson-card h2{margin:.3rem 0 .5rem}.pill{display:inline-flex;border-radius:999px;background:#eaf7f1;color:var(--green);font-weight:900;padding:5px 10px;font-size:12px}.lesson-card{margin-bottom:14px}.lesson-card pre{white-space:pre-wrap;background:#f8fbff;border:1px solid var(--line);border-radius:16px;padding:13px;max-height:360px;overflow:auto}.word-list{display:flex;flex-wrap:wrap;gap:8px}.tts-word{border:1px solid var(--line);background:var(--sky);border-radius:999px;padding:8px 11px;font-weight:850}@media(max-width:850px){.auth-grid,.course-grid{grid-template-columns:1fr}.student-hero,.student-top{align-items:flex-start;flex-direction:column}.auth-card{padding:22px}}