/* styles.css — Giao diện Hội thi trực tuyến xã Nam Phước 2026 */
:root{
  --primary:#0b4f8a;
  --primary-2:#0867b7;
  --accent:#e53935;
  --accent-2:#ff6b35;
  --ink:#17324d;
  --muted:#64748b;
  --line:#dbe5ef;
  --surface:#f5f8fc;
  --white:#fff;
  --success:#16845b;
  --shadow:0 20px 60px rgba(14,42,70,.16);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Segoe UI",Roboto,Arial,sans-serif;
  background:
    radial-gradient(circle at 15% 10%,rgba(32,128,211,.18),transparent 30%),
    radial-gradient(circle at 90% 80%,rgba(229,57,53,.12),transparent 28%),
    linear-gradient(135deg,#eaf3fb 0%,#f8fbfe 55%,#eef5fb 100%);
  min-height:100vh;padding:28px 16px;color:var(--ink);
  -webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;
}
body:before{content:"";position:fixed;inset:0;pointer-events:none;background:linear-gradient(120deg,transparent 40%,rgba(255,255,255,.5) 50%,transparent 60%);opacity:.4}
.container{max-width:920px;margin:0 auto;background:var(--white);border:1px solid rgba(255,255,255,.8);border-radius:24px;box-shadow:var(--shadow);overflow:hidden;position:relative}
.header{
  position:relative;text-align:center;color:#fff;padding:20px 26px 18px;
  background:linear-gradient(135deg,#063e73 0%,#0a67aa 58%,#0877b8 100%);
  border-bottom:3px solid var(--accent);overflow:hidden;
}
.header:before,.header:after{content:"";position:absolute;border-radius:50%;background:rgba(255,255,255,.08);pointer-events:none}
.header:before{width:300px;height:300px;right:-130px;top:-190px}
.header:after{width:230px;height:230px;left:-120px;bottom:-170px}
.header>*{position:relative;z-index:1}
.eyebrow{font-size:11px;font-weight:800;letter-spacing:1.5px;opacity:.92;margin-bottom:6px}
.header h1{font-size:21px;line-height:1.2;font-weight:900;letter-spacing:.2px;margin-bottom:4px}
.header-title{font-size:16px;line-height:1.35;font-weight:700;max-width:760px;margin:auto}
.header-subtitle{font-size:11.5px;opacity:.88;margin-top:6px}
.content{padding:34px}
.section-heading{display:flex;align-items:center;gap:14px;margin-bottom:22px}
.section-icon{width:44px;height:44px;border-radius:14px;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;display:grid;place-items:center;font-size:21px;box-shadow:0 8px 20px rgba(229,57,53,.2)}
.section-heading h2{font-size:20px;color:var(--primary);margin-bottom:3px}
.section-heading p{font-size:13px;color:var(--muted)}
.welcome-card{display:flex;gap:13px;align-items:center;padding:15px 17px;border:1px solid #d9e9f7;background:linear-gradient(135deg,#f2f8fd,#f9fcff);border-radius:14px;margin-bottom:25px}
.welcome-icon{width:38px;height:38px;border-radius:11px;background:#e2f0fc;display:grid;place-items:center;font-size:19px;flex:none}
.welcome-card strong,.welcome-card span{display:block}.welcome-card strong{font-size:14px;color:var(--primary)}.welcome-card span{font-size:12px;color:var(--muted);margin-top:3px}
.form-group{margin-bottom:19px}
.form-group label{display:block;margin-bottom:8px;font-weight:750;color:#29435c;font-size:14px}
.form-group label b,.prediction-field label b{color:var(--accent);margin-left:2px}
.form-group input,.form-group select{
  width:100%;padding:13px 15px;border:1.5px solid var(--line);border-radius:11px;background:#fbfdff;color:#17324d;font-size:15px;transition:.2s;box-shadow:0 2px 8px rgba(20,50,80,.03)
}
.form-group input:hover,.form-group select:hover{border-color:#a9c6de}
.form-group input:focus,.form-group select:focus{outline:none;border-color:#1984ca;background:#fff;box-shadow:0 0 0 4px rgba(25,132,202,.11)}
.form-group input:disabled,.form-group select:disabled{background:#eef2f6!important}
.note-text{font-size:11.5px;color:#718096;margin-top:6px;line-height:1.45}
.action-note{text-align:center;color:#718096;font-size:11.5px;margin:20px 0 10px}
.btn{border:none;color:#fff;padding:14px 20px;font-size:15px;font-weight:800;border-radius:11px;cursor:pointer;width:100%;transition:transform .2s,box-shadow .2s,filter .2s;letter-spacing:.2px}
.btn i{font-style:normal;float:right;font-size:19px;line-height:14px}
.btn:hover{transform:translateY(-2px);filter:saturate(1.08)}
.btn:active{transform:translateY(0)}
.btn:disabled{background:#b7c0c9!important;cursor:not-allowed;transform:none;box-shadow:none;filter:none}
.btn-primary,.btn-submit{background:linear-gradient(135deg,#e53935,#c51f2d);box-shadow:0 10px 24px rgba(197,31,45,.23)}
.btn-secondary{background:#fff;color:var(--primary);border:1.5px solid #cbdbe8;box-shadow:none}
.btn-secondary:hover{background:#f2f8fd;border-color:#8eb6d4;box-shadow:0 5px 14px rgba(30,70,100,.08)}
.exam-topbar{display:flex;justify-content:space-between;gap:18px;align-items:center;margin-bottom:18px}
.exam-kicker{display:block;font-size:10px;letter-spacing:1.4px;color:#1a78b8;font-weight:900;margin-bottom:4px}
.exam-topbar strong{font-size:16px;color:var(--ink)}
.timer{min-width:150px;background:#fff7e6;border:1px solid #f2d18b;color:#9a6200;padding:11px 14px;border-radius:12px;text-align:center;font-size:13px;font-weight:800;box-shadow:0 4px 12px rgba(130,90,0,.06)}
.timer span{font-size:18px;margin-left:3px}.timer.warning{background:#fff0f0;border-color:#f0aaaa;color:#a61b1b;animation:pulse 1s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.65}}
.progress-meta{display:flex;justify-content:space-between;font-size:11px;color:#718096;margin-bottom:6px}.progress-meta strong{color:var(--primary)}
.progress-bar{background:#e8eef4;border-radius:99px;height:9px;margin-bottom:19px;overflow:hidden}
.progress-fill{background:linear-gradient(90deg,#0876b8,#22a6df);height:100%;border-radius:99px;transition:width .3s}
.question-nav{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:18px;justify-content:flex-start;padding:12px;background:#f6f9fc;border:1px solid #e2ebf3;border-radius:13px}
.q-nav-btn{width:38px;height:34px;border:1.5px solid #d4e0ea;border-radius:8px;background:#fff;color:#50657a;cursor:pointer;font-weight:750;transition:.15s}
.q-nav-btn:hover{border-color:#8db7d6;transform:translateY(-1px)}
.q-nav-btn.answered{background:#0c7b59;color:#fff;border-color:#0c7b59}.q-nav-btn.current{border-color:#e53935;box-shadow:0 0 0 3px rgba(229,57,53,.13);color:#c51f2d}
.question-box{background:#fff;padding:25px;border-radius:16px;margin-bottom:18px;border:1px solid #e0e8ef;border-top:4px solid #0b6da9;box-shadow:0 8px 24px rgba(25,58,90,.06)}
.question-number{display:inline-block;color:#fff;background:#0b6da9;padding:6px 10px;border-radius:7px;font-weight:800;margin-bottom:13px;font-size:12px}
.question-text{font-size:17px;line-height:1.65;margin-bottom:18px;color:#243b53;font-weight:650}
.options{display:flex;flex-direction:column;gap:10px}
.option{display:flex;align-items:flex-start;padding:13px 14px;background:#fbfdff;border:1.5px solid #dbe5ee;border-radius:11px;cursor:pointer;transition:.18s;word-break:break-word}
.option:hover{border-color:#72a9cf;background:#f2f8fd;transform:translateX(2px)}
.option.selected{border-color:#0b6da9;background:#eaf5fc;box-shadow:inset 4px 0 #0b6da9}
.option input{margin:3px 12px 0 1px;transform:scale(1.15);flex-shrink:0;accent-color:#0b6da9}
.option label{cursor:pointer;flex:1;line-height:1.5;color:#334e68}.option label strong{color:#0b6da9;margin-right:5px}
.nav-buttons{display:flex;gap:10px;margin-top:18px}.nav-buttons .btn{flex:1;padding:12px}
.submit-box{background:linear-gradient(135deg,#f4f9fd,#fbfdff);padding:20px;border-radius:15px;margin-top:20px;border:1px solid #d7e6f1;border-left:4px solid #e53935}
.submit-heading{display:flex;gap:11px;align-items:center;margin-bottom:15px}.submit-heading>span{font-size:22px}.submit-heading strong,.submit-heading small{display:block}.submit-heading strong{color:#28445c;font-size:14px}.submit-heading small{color:#718096;font-size:11px;margin-top:2px}
.prediction-field{margin-bottom:13px}.prediction-field input{font-size:16px}
.exam-note{background:#fff8e8;color:#8a620b;padding:10px 12px;border-radius:9px;border:1px solid #f2dfad;text-align:center;font-size:11px;margin-top:11px}
.result-box{text-align:center;padding:25px 10px}.result-icon{width:70px;height:70px;margin:0 auto 14px;border-radius:50%;background:linear-gradient(135deg,#16845b,#27aa7a);color:#fff;display:grid;place-items:center;font-size:36px;font-weight:900;box-shadow:0 12px 28px rgba(22,132,91,.2)}
.result-box h2{color:var(--primary);margin-bottom:16px;font-size:21px}.result-score{font-size:58px;font-weight:900;color:var(--primary);line-height:1.05}.result-text{font-size:15px;color:#60758a;margin:13px 0 20px}.result-details{background:#f7fafc;padding:20px;border:1px solid #e0e8ef;border-radius:13px;margin-top:15px;text-align:left;display:inline-block;min-width:min(100%,520px)}
.hidden{display:none!important}.error-box{background:#fff0f0;color:#a61b1b;padding:14px;border-radius:10px;text-align:center;margin:10px 0;border:1px solid #f0b4b4}
@media(max-width:650px){
 body{padding:8px}.container{border-radius:16px}.header{padding:18px 14px 16px}.header h1{font-size:18px}.header-title{font-size:13.5px}.header-subtitle{font-size:10.5px;margin-top:5px}.desktop-only{display:none}
 .content{padding:20px 15px}.section-heading{margin-bottom:17px}.section-heading h2{font-size:18px}
 .exam-topbar{align-items:stretch;flex-direction:column;gap:10px}.timer{width:100%}.question-nav{gap:5px}.q-nav-btn{width:35px;height:32px;font-size:11px}
 .question-box{padding:17px}.question-text{font-size:15px;line-height:1.58}.option{padding:11px 10px}.option label{font-size:13px}
 .nav-buttons{gap:7px}.nav-buttons .btn{font-size:13px}.result-score{font-size:48px}
}
@media(min-width:651px){.form-group:nth-of-type(4){margin-top:4px}}