:root{color-scheme:dark;--bg:#101827;--panel:#172235;--panel2:#1e2b40;--text:#edf3fb;--muted:#9eacc1;--line:#2c3b52;--blue:#76a9ff;--mint:#80e0c2;--danger:#ff9b9b}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 15% -10%,#1d3452 0,transparent 40%),var(--bg);color:var(--text);font:16px/1.55 system-ui,-apple-system,Segoe UI,sans-serif}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}.top{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 max(22px,calc((100vw - 1120px)/2));border-bottom:1px solid #26344a;background:#101827e8;position:sticky;top:0;z-index:5;backdrop-filter:blur(12px)}.brand{font-size:22px;font-weight:850;color:#fff;letter-spacing:-.8px}.brand span{color:var(--mint)}nav{display:flex;align-items:center;gap:20px}nav a{font-size:14px;color:#d4deed}.navcta{background:var(--blue);color:#0d1728;padding:9px 14px;border-radius:10px;font-weight:750}.inline{display:inline}.navbtn{border:0;background:transparent;color:#d4deed;cursor:pointer;font:inherit}.container{max-width:1120px;margin:0 auto;padding:40px 22px 70px;min-height:75vh}.hero{display:grid;grid-template-columns:1.2fr .8fr;gap:70px;align-items:center;padding:48px 0 60px}.eyebrow{font-size:11px;font-weight:800;letter-spacing:2px;color:var(--mint);margin-bottom:12px}.hero h1,.pagehead h1{font-size:clamp(36px,5vw,58px);line-height:1.06;letter-spacing:-2px;margin:0 0 20px}.hero h1 span{color:var(--blue)}.hero p,.pagehead p{color:var(--muted);font-size:17px;max-width:620px}.actions{display:flex;gap:12px;margin:25px 0}.button{display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:10px;padding:12px 18px;font:700 14px system-ui;cursor:pointer;text-decoration:none!important;transition:transform .15s,opacity .15s}.button:hover{transform:translateY(-1px)}.primary{background:var(--blue);color:#101827}.secondary{background:#26364d;color:#eaf1fc;border:1px solid #3b4c65}.full{width:100%;margin-top:10px}.small{padding:7px 10px;font-size:12px}.tiny,.muted,small{font-size:12px;color:var(--muted)}.hero-card{background:linear-gradient(145deg,#1c2b42,#142033);border:1px solid #31425b;border-radius:26px;padding:28px;box-shadow:0 25px 70px #0003;min-height:330px}.orb{width:68px;height:68px;display:grid;place-items:center;border-radius:22px;background:linear-gradient(135deg,#80e0c2,#76a9ff);color:#101827;font-weight:900;font-size:25px;margin-bottom:25px}.bubble{background:#24364d;border:1px solid #3a4e68;border-radius:14px 14px 14px 4px;padding:13px 15px;margin:10px 0;max-width:90%}.userbubble{margin-left:auto;background:#234c50;border-color:#34746f;border-radius:14px 14px 4px 14px}.feedback{background:#162e30;color:#9ce5c8;padding:11px;border-radius:10px;font-size:13px;margin:18px 0}.features,.plan-grid,.lesson-grid,.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.features article,.plan,.lesson,.stats article,.admin-section,.chat-card,.form-card{background:#172235;border:1px solid var(--line);border-radius:17px;padding:22px}.features h3,.lesson h3{margin:0 0 8px}.features p,.lesson p,.plan p{color:var(--muted);font-size:14px;margin:0}.pagehead{margin:8px 0 30px}.pagehead h1{font-size:42px}.form-card{max-width:520px;margin:20px auto;padding:30px}.form-card h1{margin:0 0 12px;font-size:30px}.form-card p{color:var(--muted)}label{display:block;font-size:13px;color:#c8d3e3;font-weight:650;margin:14px 0}input,textarea,select{display:block;width:100%;margin-top:7px;padding:12px 13px;border:1px solid #394b64;background:#0f1929;color:var(--text);border-radius:9px;font:inherit;font-size:14px}input:focus,textarea:focus{outline:2px solid #76a9ff88;border-color:var(--blue)}.price{font-size:30px;font-weight:850;margin:20px 0 8px}.price small{font-size:12px;font-weight:400}.plan{display:flex;flex-direction:column}.plan h2{margin:0 0 10px}.plan .button{margin-top:auto}.plan .muted{margin:16px 0}.notice{border:1px solid #39516d;background:#1b2c42;padding:12px 15px;border-radius:10px;margin-bottom:18px}.notice.error{border-color:#79404a;color:#ffc1c1}.notice.success{border-color:#326d5d;color:#a6f0d1}.level{display:inline-block;background:#263b59;color:#b9d3ff;padding:4px 8px;border-radius:6px;font-size:11px;font-weight:800}.lesson{min-height:150px}.chat-card{margin-top:28px}.chat-card h2{margin:0}.chat-log{display:flex;flex-direction:column;gap:10px;background:#101a2a;border:1px solid #2a3b52;border-radius:12px;padding:14px;min-height:100px;max-height:420px;overflow:auto;margin:20px 0}.chat-msg{white-space:pre-wrap;overflow-wrap:anywhere;padding:12px 14px;border-radius:12px;max-width:92%;font-size:14px}.chat-msg.assistant{background:#23334b;align-self:flex-start}.chat-msg.user{background:#234c50;align-self:flex-end}.chat-actions{display:flex;gap:10px;flex-wrap:wrap}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.stats{margin-bottom:25px}.stats article{display:flex;flex-direction:column;gap:8px}.stats span{color:var(--muted);font-size:13px}.stats strong{font-size:26px}.admin-section{margin:20px 0}.admin-section h2{margin-top:0}.admin-form{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;align-items:end}.table-wrap{overflow:auto;margin-top:20px}table{width:100%;border-collapse:collapse;font-size:13px;white-space:nowrap}th,td{text-align:left;padding:11px;border-bottom:1px solid #2b3a50}th{color:#b7c7dc;font-weight:700}.qr{display:block;width:220px;height:220px;object-fit:contain;background:#fff;border-radius:10px;padding:10px;margin:15px auto}footer{border-top:1px solid #26344a;color:#8595ab;text-align:center;padding:25px;font-size:12px}footer span{color:#aab7c9}@media(max-width:800px){.hero{grid-template-columns:1fr;gap:25px;padding-top:20px}.features,.plan-grid,.lesson-grid,.stats{grid-template-columns:1fr}.admin-form{grid-template-columns:1fr}.top{padding:0 15px}nav{gap:10px}nav a{font-size:12px}.container{padding:25px 15px 50px}.pagehead h1{font-size:34px}.hero h1{letter-spacing:-1px}.form-card{padding:22px}}
.admin-links{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:12px 0 20px}.modal{width:min(560px,calc(100% - 24px));max-height:90vh;overflow:auto;background:#172235;color:var(--text);border:1px solid var(--line);border-radius:18px;padding:24px}.modal::backdrop{background:#020617cc;backdrop-filter:blur(3px)}.modal h2{margin-top:0}.danger{background:#572b36;color:#ffdbe0;border:1px solid #85414f}
/* Melhorias do professor virtual */
.chat-card{position:relative;overflow:hidden;background:linear-gradient(145deg,#17263b,#121e30);box-shadow:0 18px 45px #0002}.chat-card>div:first-child{display:flex;flex-direction:column;gap:5px}.chat-card h2{font-size:clamp(24px,3vw,32px);letter-spacing:-.7px}.chat-card>div:first-child p{color:#aebed3;margin:4px 0 0}.chat-log{min-height:240px;max-height:520px;padding:20px;background:radial-gradient(ellipse at top left,#1b2b42,#0d1726);border-radius:16px;gap:14px}.chat-msg{max-width:min(88%,760px);padding:14px 16px;line-height:1.65;box-shadow:0 4px 12px #0001}.chat-msg.assistant{border:1px solid #344963;border-bottom-left-radius:4px}.chat-msg.user{border:1px solid #2c6b69;border-bottom-right-radius:4px}.chat-card textarea{min-height:100px;resize:vertical;padding:15px;border-radius:13px}.chat-actions .button{min-height:44px}.chat-card #voice-status{margin-top:10px;min-height:20px;overflow-wrap:anywhere}.chat-card .tiny{margin-top:12px;line-height:1.6}.chat-card button:disabled{opacity:.55;cursor:wait}.chat-msg button{display:flex;margin-top:12px}@media(max-width:640px){.chat-card{padding:16px}.chat-log{min-height:200px;padding:12px}.chat-msg{max-width:96%;font-size:14px}.chat-actions .button{flex:1}}

.preferences-card form{max-width:650px;margin-top:18px}.preferences-card label{margin:16px 0 7px}.preferences-card .checkline{display:flex;align-items:center;gap:10px;font-weight:500}.preferences-card .checkline input{width:auto;display:inline-block;margin:0;flex:0 0 auto}.preferences-card #preferences-status{margin-top:12px;min-height:20px}.preferences-card button:disabled{opacity:.6;cursor:wait}