:root{
  --navy:#0d2a4a; --navy-2:#123a63; --teal:#0e8a8f; --teal-soft:#e3f4f4;
  --amber:#f5b335; --amber-d:#d99a1c; --ink:#1b2a3a; --muted:#64748b;
  --bg:#f4f7fb; --card:#fff; --line:#e3e9f1; --radius:16px;
  --shadow:0 6px 24px rgba(13,42,74,.08);
}
body{font-family:'Sarabun','Prompt',sans-serif;background:var(--bg);color:var(--ink);font-size:1.02rem}
h1,h2,h3,h4,h5,.navbar-brand,.btn,.badge,.stat-num{font-family:'Prompt','Sarabun',sans-serif}
a{color:var(--teal)}
.site-nav{background:linear-gradient(100deg,var(--navy),var(--navy-2));box-shadow:0 2px 12px rgba(0,0,0,.15)}
.site-nav .nav-link{color:rgba(255,255,255,.82);font-size:.95rem;border-radius:8px;padding:.5rem .75rem}
.site-nav .nav-link:hover,.site-nav .nav-link.active{color:#fff;background:rgba(255,255,255,.12)}
.brand-mark{width:40px;height:40px;border-radius:12px;background:var(--amber);color:var(--navy);display:grid;place-items:center;font-size:1.3rem;flex:none}
.brand-sub{font-size:.68rem;opacity:.75;font-weight:400}
.navbar-brand strong{font-size:1.02rem}
.btn-accent{background:var(--amber);border-color:var(--amber);color:var(--navy);font-weight:600}
.btn-accent:hover{background:var(--amber-d);border-color:var(--amber-d);color:var(--navy)}
.btn-teal{background:var(--teal);border-color:var(--teal);color:#fff}
.btn-teal:hover{background:#0b7377;border-color:#0b7377;color:#fff}

/* hero */
.hero{position:relative;color:#fff;background:linear-gradient(120deg,var(--navy) 0%,#0f4c75 55%,var(--teal) 100%);padding:3.2rem 0 5.5rem;overflow:hidden}
.hero::before,.hero::after{content:"";position:absolute;border-radius:50%;background:rgba(255,255,255,.06)}
.hero::before{width:380px;height:380px;right:-90px;top:-130px}
.hero::after{width:240px;height:240px;left:-70px;bottom:-110px;background:rgba(245,179,53,.12)}
.hero h1{font-weight:700;font-size:clamp(1.6rem,4vw,2.5rem)}
.hero p{opacity:.88;max-width:640px}
.hero .eyebrow{display:inline-block;background:rgba(245,179,53,.18);color:var(--amber);padding:.25rem .8rem;border-radius:99px;font-size:.82rem;margin-bottom:.8rem}

/* stats */
.stats-wrap{margin-top:-3.4rem;position:relative;z-index:2}
.stat-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.1rem 1.2rem;height:100%;display:flex;gap:.9rem;align-items:center;border:1px solid var(--line)}
.stat-ico{width:50px;height:50px;border-radius:14px;display:grid;place-items:center;font-size:1.5rem;flex:none;background:var(--teal-soft);color:var(--teal)}
.stat-card:nth-child(2) .stat-ico{background:#fff3d6;color:var(--amber-d)}
.stat-num{font-size:1.7rem;font-weight:700;line-height:1;color:var(--navy)}
.stat-label{color:var(--muted);font-size:.85rem}
.panel{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--line);padding:1.25rem}
.bar-row{margin-bottom:.85rem}
.bar-row .bar-track{height:10px;background:#edf1f6;border-radius:99px;overflow:hidden}
.bar-row .bar-fill{height:100%;border-radius:99px;background:linear-gradient(90deg,var(--teal),#35b6b9)}
.bar-row a{color:var(--ink);text-decoration:none}
.bar-row a:hover{color:var(--teal)}
.chip{display:inline-block;padding:.18rem .65rem;border-radius:99px;background:var(--teal-soft);color:#0a6b6f;font-size:.8rem;text-decoration:none;margin:0 .2rem .3rem 0;border:1px solid transparent}
a.chip:hover{border-color:var(--teal);color:#0a6b6f}
.chip.on{background:var(--teal);color:#fff}

/* filter */
.filter-bar{margin-top:-1px}
.form-control,.form-select{border-radius:10px;border-color:#d5dde8;padding:.55rem .8rem}
.form-control:focus,.form-select:focus{border-color:var(--teal);box-shadow:0 0 0 .2rem rgba(14,138,143,.15)}

/* work card */
.work-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;height:100%;display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s}
.work-card:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(13,42,74,.14)}
.work-thumb{aspect-ratio:16/10;background:linear-gradient(135deg,#dbeafe,#e0f7f7);position:relative;overflow:hidden}
.work-thumb img{width:100%;height:100%;object-fit:cover}
.work-thumb .noimg{position:absolute;inset:0;display:grid;place-items:center;font-size:2.8rem;color:var(--teal);opacity:.45}
.work-thumb .cat-badge{position:absolute;left:10px;top:10px;background:rgba(13,42,74,.88);color:#fff;font-size:.74rem;padding:.25rem .6rem;border-radius:99px;max-width:calc(100% - 20px);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.work-body{padding:1rem 1.1rem 1.1rem;display:flex;flex-direction:column;flex:1}
.work-title{font-family:'Prompt',sans-serif;font-weight:600;font-size:1.04rem;line-height:1.4;color:var(--navy);margin-bottom:.35rem;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.work-meta{font-size:.86rem;color:var(--muted)}
.work-card .stretched-link{text-decoration:none}

/* detail */
.detail-img{width:100%;border-radius:var(--radius);box-shadow:var(--shadow);background:#fff}
.info-label{font-family:'Prompt',sans-serif;font-size:.8rem;color:var(--teal);font-weight:600;text-transform:none;margin-bottom:.15rem}
.info-block{margin-bottom:1.1rem}
.info-block p{margin:0;white-space:pre-line}

/* auth / forms */
.auth-card{max-width:440px;margin:3rem auto}
.page-head{background:linear-gradient(110deg,var(--navy),#0f4c75);color:#fff;padding:1.6rem 0}
.page-head h1{font-size:1.45rem;margin:0}
.form-section{font-family:'Prompt',sans-serif;color:var(--navy);font-weight:600;border-left:4px solid var(--amber);padding-left:.6rem;margin:1.4rem 0 .9rem}
.req::after{content:" *";color:#d9363e}
.preview-img{max-height:180px;border-radius:12px;border:1px solid var(--line)}

/* table */
.table-wrap{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)}
.table thead th{background:#eef3f9;color:var(--navy);font-family:'Prompt',sans-serif;font-weight:600;font-size:.88rem;border-bottom:0;white-space:nowrap}
.table td{vertical-align:middle}
.thumb-sm{width:64px;height:44px;object-fit:cover;border-radius:8px;background:#e8eef5}

.pagination .page-link{color:var(--navy);border-radius:8px;margin:0 2px;border-color:var(--line)}
.pagination .active .page-link{background:var(--teal);border-color:var(--teal);color:#fff}
.site-footer{background:var(--navy);color:rgba(255,255,255,.75)}

@media (max-width:575.98px){
  .hero{padding:2.2rem 0 4.6rem}
  .stat-num{font-size:1.4rem}
  .stat-ico{width:42px;height:42px;font-size:1.2rem}
  .stat-card{padding:.85rem}
  .auth-card{margin:1.5rem auto}
}

/* ตรวจรหัสนักศึกษา */
.id-card{border:1px dashed #cbd5e1;background:#f8fafc;border-radius:12px;padding:.6rem .85rem;min-height:46px;display:flex;flex-direction:column;justify-content:center}
.id-card.ok{border:1px solid #86d6a0;background:#effaf2}
.id-card.bad{border:1px solid #f1b0b4;background:#fff3f3;color:#a3262d}