/* Trang đánh giá buổi học khóa AI - nền bầu trời đêm giống trang đăng ký khóa AI */
*{box-sizing:border-box}
:root{
  --bg:#03061a; --card:rgba(13,19,52,.92); --line:rgba(150,170,255,.16); --line2:rgba(150,170,255,.28);
  --text:#eef2ff; --muted:#a3acd6; --gold:#ffcf4a; --gold2:#ffb020; --blue:#3b82f6; --blue2:#2563eb;
  --ok:#22c55e; --bad:#f97316;
}
html,body{margin:0;min-height:100%}
body{font-family:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--text);background:var(--bg);
  -webkit-font-smoothing:antialiased;line-height:1.5}
button,input,textarea{font:inherit;color:inherit}

/* bầu trời */
.scene{position:fixed;inset:0;overflow:hidden;z-index:0;pointer-events:none;background:
  radial-gradient(1200px 500px at 50% 115%,rgba(76,64,170,.22),transparent 70%),
  radial-gradient(700px 420px at 85% -5%,rgba(37,99,235,.13),transparent 65%),
  linear-gradient(180deg,#010208 0%,#03061a 40%,#070b26 75%,#0d1038 100%)}
.scene::before{content:"";position:absolute;left:-30%;top:18%;width:160%;height:260px;border-radius:50%;
  background:radial-gradient(ellipse at center,rgba(170,185,255,.07) 0%,rgba(140,120,255,.035) 40%,transparent 70%);transform:rotate(-24deg);filter:blur(24px)}
.star{position:absolute;border-radius:50%;opacity:var(--o,.6);animation:twinkle 4s ease-in-out infinite}
.star.big{box-shadow:0 0 6px 1px rgba(190,210,255,.8)}
@keyframes twinkle{0%,100%{opacity:var(--o,.6)}50%{opacity:.08}}
.meteor{position:absolute;width:var(--len,160px);height:2px;border-radius:2px;transform-origin:right center;
  background:linear-gradient(90deg,rgba(255,255,255,0),rgba(200,220,255,.55) 60%,#fff);
  filter:drop-shadow(0 0 6px rgba(160,200,255,.9));opacity:0;animation:meteor 1.2s ease-out forwards}
@keyframes meteor{0%{opacity:0;transform:rotate(var(--a)) translateX(0)}12%{opacity:1}70%{opacity:1}100%{opacity:0;transform:rotate(var(--a)) translateX(420px)}}
@media (prefers-reduced-motion:reduce){.meteor{display:none}.star{animation:none}}

/* khung */
.wrap{position:relative;z-index:1;max-width:560px;margin:0 auto;padding:28px 16px 40px;min-height:100vh;display:flex;flex-direction:column}
.brand{display:flex;align-items:center;justify-content:center;gap:10px;margin-bottom:18px}
.brand .logo{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;font-weight:800;font-size:15px;
  background:linear-gradient(135deg,var(--blue),#7c5cff);box-shadow:0 6px 20px rgba(59,130,246,.35)}
.brand .name{font-weight:700;letter-spacing:.2px}
.brand .name small{display:block;font-weight:500;color:var(--muted);font-size:12.5px;letter-spacing:.3px}

.card{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:28px 22px;
  box-shadow:0 24px 70px rgba(0,0,0,.45),inset 0 1px 0 rgba(255,255,255,.04);backdrop-filter:blur(6px)}
h1{font-size:24px;line-height:1.3;margin:0 0 6px;text-align:center;letter-spacing:-.2px}
.sub{color:var(--muted);text-align:center;margin:0 0 22px;font-size:15px}

.label{display:block;font-weight:600;font-size:14.5px;margin:0 0 10px;color:#dfe5ff}
.label .opt{font-weight:400;color:var(--muted)}
.block{margin-top:22px}
.hide{display:none!important}

/* chọn buổi */
.seg{display:flex;gap:8px;flex-wrap:wrap}
.seg button{flex:1 1 0;min-width:140px;border:1px solid var(--line2);background:rgba(255,255,255,.03);border-radius:12px;padding:10px 12px;
  cursor:pointer;font-size:14px;font-weight:600;transition:.15s;text-align:center}
.seg button small{display:block;font-weight:400;color:var(--muted);font-size:12.5px}
.seg button[aria-pressed="true"]{border-color:var(--blue);background:rgba(59,130,246,.16);box-shadow:0 0 0 3px rgba(59,130,246,.18)}

/* sao */
.stars{display:flex;justify-content:center;gap:6px;margin:4px 0 6px}
.stars button{background:none;border:0;padding:4px;cursor:pointer;line-height:0;border-radius:12px;transition:transform .15s}
.stars button:hover{transform:scale(1.08)}
.stars button:focus-visible{outline:2px solid var(--blue);outline-offset:2px}
.stars svg{width:50px;height:50px;display:block}
.stars path{fill:rgba(255,255,255,.07);stroke:rgba(200,210,255,.38);stroke-width:1.3;transition:fill .15s,stroke .15s}
.stars button.on path{fill:url(#g);stroke:var(--gold2);filter:drop-shadow(0 0 8px rgba(255,190,40,.45))}
.stars button.pop{animation:pop .35s ease}
@keyframes pop{50%{transform:scale(1.25)}}
.verdict{text-align:center;min-height:26px;font-weight:700;font-size:17px;color:var(--muted);transition:color .2s}
.verdict.s1,.verdict.s2{color:#fb923c}.verdict.s3{color:#facc15}.verdict.s4,.verdict.s5{color:var(--gold)}

/* thẻ chọn nhanh */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips button{border:1px solid var(--line2);background:rgba(255,255,255,.03);border-radius:999px;padding:8px 14px;font-size:14px;cursor:pointer;transition:.15s}
.chips button:hover{border-color:rgba(150,170,255,.5)}
.chips button[aria-pressed="true"]{background:rgba(59,130,246,.2);border-color:var(--blue);color:#fff}
.chips button[aria-pressed="true"]::before{content:"✓ ";font-weight:700}

textarea,input[type=text]{width:100%;background:rgba(3,6,26,.6);border:1px solid var(--line2);border-radius:12px;padding:12px 14px;font-size:15px;outline:none;transition:.15s}
textarea{min-height:104px;resize:vertical}
textarea:focus,input[type=text]:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(59,130,246,.2)}
::placeholder{color:#7d87b5}

.btn{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;margin-top:24px;border:0;border-radius:14px;padding:15px 18px;
  font-size:17px;font-weight:700;color:#fff;cursor:pointer;background:linear-gradient(135deg,var(--blue),var(--blue2));
  box-shadow:0 10px 26px rgba(37,99,235,.4);transition:.15s}
.btn:hover{filter:brightness(1.08)}
.btn:disabled{opacity:.45;cursor:not-allowed;box-shadow:none;filter:none}
.btn.ghost{background:transparent;border:1px solid var(--line2);box-shadow:none;font-size:15px;font-weight:600;margin-top:14px}
.hint{text-align:center;color:var(--muted);font-size:13px;margin:10px 0 0}
.err{color:#fca5a5;text-align:center;font-size:14px;margin:10px 0 0}
.spin{width:18px;height:18px;border:2.5px solid rgba(255,255,255,.35);border-top-color:#fff;border-radius:50%;animation:sp .8s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}

/* cảm ơn */
.thanks{text-align:center;padding:10px 0 4px}
.tick{width:74px;height:74px;margin:0 auto 16px;border-radius:50%;display:grid;place-items:center;background:rgba(34,197,94,.14);box-shadow:0 0 0 8px rgba(34,197,94,.07)}
.tick svg{width:38px;height:38px;stroke:var(--ok);stroke-width:3;fill:none;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:40;stroke-dashoffset:40;animation:draw .6s .1s ease forwards}
@keyframes draw{to{stroke-dashoffset:0}}
.mini-stars{color:var(--gold);font-size:24px;letter-spacing:3px;margin:6px 0 2px}
.mini-stars .off{color:rgba(255,255,255,.18)}

.foot{margin-top:auto;padding-top:22px;text-align:center;color:#6f79a8;font-size:12.5px}

@media (max-width:420px){
  .card{padding:24px 16px;border-radius:18px}
  h1{font-size:21px}
  .stars{gap:2px}
  .stars svg{width:46px;height:46px}
}