/* ==========================================================
   วารสารวิชาการ ร.ร.สาธิต มรภ.วไลยอลงกรณ์ — Design System
   Palette: กรมท่า-ทองเหลือง บนกระดาษนวล
   ========================================================== */
:root{
  --navy:#132A4F;        /* กรมท่าหลัก */
  --navy-deep:#0B1B36;   /* กรมท่าเข้ม (header/ปกวารสาร) */
  --gold:#C9A227;        /* ทองเหลือง */
  --gold-soft:#E4CE7E;   /* ทองอ่อน */
  --paper:#F8F5EE;       /* พื้นกระดาษนวล */
  --card:#FFFFFF;
  --ink:#22293B;         /* ตัวอักษรหลัก */
  --ink-dim:#6A7186;     /* ตัวอักษรรอง */
  --line:#E3DCC9;        /* เส้นแบ่งโทนกระดาษ */
  --ok:#2E7D46; --warn:#B26A00; --bad:#B3372E;
  --radius:10px;
  --shadow:0 2px 14px rgba(19,42,79,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:'Sarabun',sans-serif;font-size:17px;line-height:1.7;
  color:var(--ink);background:var(--paper)}
h1,h2,h3{font-family:'Trirong',serif;color:var(--navy);line-height:1.35;margin:0 0 .5em}
a{color:var(--navy);text-decoration:none}
img{max-width:100%}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}

/* ---------- ส่วนหัว ---------- */
.masthead{background:var(--navy-deep);border-bottom:3px solid var(--gold)}
.masthead-in{display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:14px 20px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:12px;color:#fff}
.brand-seal{display:grid;place-items:center;width:46px;height:46px;border-radius:50%;
  border:2px solid var(--gold);color:var(--gold);font-family:'Trirong',serif;
  font-size:24px;font-weight:700;flex:none}
.brand-text{display:flex;flex-direction:column}
.brand-text strong{font-size:17px;line-height:1.3}
.brand-text small{color:var(--gold-soft);font-size:12.5px;letter-spacing:.4px}
.mainnav{display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.mainnav a{color:#DDE3F0;padding:8px 13px;border-radius:6px;font-size:15.5px}
.mainnav a:hover{background:rgba(255,255,255,.09);color:#fff}
.mainnav a.on{color:var(--gold-soft);box-shadow:inset 0 -2px 0 var(--gold)}
.mainnav .nav-login{border:1px solid var(--gold);color:var(--gold-soft)}
.mainnav .nav-user{color:var(--gold-soft)}

/* ---------- Hero ---------- */
.hero{background:linear-gradient(160deg,var(--navy-deep) 0%,var(--navy) 70%,#1D3E6E 100%);
  color:#fff;padding:56px 0 64px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;inset:auto -80px -120px auto;width:340px;height:340px;
  border:1px solid rgba(201,162,39,.35);border-radius:50%}
.hero::before{content:"";position:absolute;inset:auto -40px -180px auto;width:460px;height:460px;
  border:1px solid rgba(201,162,39,.18);border-radius:50%}
.hero h1{color:#fff;font-size:clamp(26px,4vw,40px)}
.hero p{color:#C7D2E6;font-size:18px}
.hero .gold-rule{width:72px;height:3px;background:var(--gold);margin:18px 0 22px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}

/* ---------- ปุ่ม ---------- */
.btn{display:inline-block;padding:10px 22px;border-radius:8px;font-size:16px;
  font-weight:600;border:1px solid transparent;cursor:pointer;font-family:inherit;
  transition:transform .12s ease, box-shadow .12s ease}
.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow)}
.btn-gold{background:var(--gold);color:var(--navy-deep)}
.btn-ghost{border-color:rgba(255,255,255,.5);color:#fff}
.btn-navy{background:var(--navy);color:#fff}
.btn-line{border-color:var(--navy);color:var(--navy);background:transparent}
.btn-sm{padding:5px 12px;font-size:14px;border-radius:6px}
.btn-danger{background:var(--bad);color:#fff}

/* ---------- Section ---------- */
.sec{padding:44px 0}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;
  border-bottom:2px solid var(--line);padding-bottom:10px;margin-bottom:24px}
.sec-head h2{margin:0;font-size:24px}
.sec-head h2::before{content:"◆";color:var(--gold);font-size:14px;margin-right:10px;vertical-align:2px}
.sec-head a{font-size:15px;color:var(--ink-dim)}

/* ---------- ปกวารสาร (signature) ---------- */
.covers{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:26px}
.cover{aspect-ratio:3/4.2;background:linear-gradient(165deg,var(--navy-deep),var(--navy) 65%,#1D3E6E);
  border-radius:6px 14px 14px 6px;color:#fff;padding:20px 18px 16px 24px;position:relative;
  display:flex;flex-direction:column;box-shadow:6px 8px 18px rgba(11,27,54,.28);
  transition:transform .15s ease}
.cover:hover{transform:translateY(-5px) rotate(-.6deg)}
.cover::before{content:"";position:absolute;left:9px;top:0;bottom:0;width:1px;
  background:rgba(201,162,39,.55)}
.cover::after{content:"";position:absolute;inset:10px;border:1px solid rgba(201,162,39,.4);
  border-radius:4px 10px 10px 4px;pointer-events:none}
.cover .c-year{font-size:13px;color:var(--gold-soft);letter-spacing:1.5px}
.cover .c-vol{font-family:'Trirong',serif;font-size:21px;font-weight:700;color:#fff;
  margin-top:8px;line-height:1.4}
.cover .c-count{margin-top:auto;font-size:13px;color:#B9C6DE}
.cover .c-seal{position:absolute;right:16px;bottom:14px;width:30px;height:30px;border-radius:50%;
  border:1px solid var(--gold);color:var(--gold);display:grid;place-items:center;
  font-family:'Trirong',serif;font-size:15px}

/* ---------- รายการบทความ ---------- */
.art-list{display:flex;flex-direction:column;gap:14px}
.art-item{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--gold);
  border-radius:var(--radius);padding:18px 22px;box-shadow:var(--shadow)}
.art-item h3{font-size:19px;margin-bottom:4px}
.art-item h3 a:hover{color:#1D3E6E;text-decoration:underline}
.art-meta{font-size:14.5px;color:var(--ink-dim);display:flex;gap:14px;flex-wrap:wrap}
.art-meta .cat{color:var(--gold);font-weight:600}
.badge{display:inline-block;font-size:13px;font-weight:600;padding:2px 10px;border-radius:99px}
.st-pending{background:#EEF1F6;color:#4A5468}
.st-review{background:#FFF3D6;color:var(--warn)}
.st-revision{background:#FDEBD2;color:#9A5B00}
.st-accepted{background:#E2F2E7;color:var(--ok)}
.st-rejected{background:#FBE4E2;color:var(--bad)}
.st-published{background:#E7EDF8;color:var(--navy)}

/* ---------- หน้าบทความ ---------- */
.art-page{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:34px 38px;box-shadow:var(--shadow)}
.art-page h1{font-size:27px}
.art-page .en-title{font-size:18px;color:var(--ink-dim);font-family:'Trirong',serif;margin-top:-8px}
.kv{margin:18px 0;border-top:1px dashed var(--line);border-bottom:1px dashed var(--line);
  padding:12px 0;font-size:15.5px}
.kv div{display:flex;gap:10px;padding:3px 0}
.kv b{flex:none;width:120px;color:var(--navy)}
.abstract{background:var(--paper);border-left:3px solid var(--gold);padding:16px 20px;
  border-radius:0 8px 8px 0;margin:20px 0}
.dl-row{display:flex;align-items:center;gap:18px;margin-top:24px;flex-wrap:wrap}
.stats-mini{font-size:14.5px;color:var(--ink-dim)}

/* ---------- ฟอร์ม ---------- */
.form-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 34px;box-shadow:var(--shadow);max-width:760px;margin:0 auto}
.form-card.narrow{max-width:420px}
label{display:block;font-weight:600;color:var(--navy);margin:16px 0 5px;font-size:15.5px}
input[type=text],input[type=password],input[type=email],input[type=number],select,textarea{
  width:100%;padding:10px 13px;border:1px solid #CFD6E2;border-radius:8px;
  font-family:inherit;font-size:16px;background:#FDFDFB;color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:2px solid var(--gold-soft);border-color:var(--gold)}
textarea{min-height:130px;resize:vertical}
.form-hint{font-size:13.5px;color:var(--ink-dim);margin-top:3px}
.form-actions{margin-top:26px;display:flex;gap:12px;align-items:center}

/* ---------- ตาราง ---------- */
table.tb{width:100%;border-collapse:collapse;background:var(--card);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow);font-size:15.5px}
.tb th{background:var(--navy);color:#fff;text-align:left;padding:11px 14px;font-weight:600}
.tb td{padding:10px 14px;border-bottom:1px solid #EEF0F4;vertical-align:top}
.tb tr:last-child td{border-bottom:none}
.tb tr:hover td{background:#FAFBFD}
.tb .num{text-align:right;font-variant-numeric:tabular-nums}

/* ---------- Flash ---------- */
.flash{margin:18px 0;padding:12px 18px;border-radius:8px;font-weight:500}
.flash-ok{background:#E2F2E7;color:var(--ok);border:1px solid #BCDFC8}
.flash-err{background:#FBE4E2;color:var(--bad);border:1px solid #F2C2BE}

/* ---------- Footer ---------- */
.foot{background:var(--navy-deep);color:#AAB6CC;margin-top:56px;padding:28px 0;
  border-top:3px solid var(--gold);font-size:14.5px;text-align:center}
.foot p{margin:4px 0}
.foot strong{color:#E3E9F4}

/* ---------- หลังบ้าน ---------- */
.adm{background:#EFF1F5}
.adm-shell{display:flex;min-height:100vh}
.adm-side{width:240px;flex:none;background:var(--navy-deep);color:#fff;padding:22px 0}
.adm-logo{display:flex;align-items:center;gap:10px;font-family:'Trirong',serif;
  font-size:16.5px;padding:0 20px 18px;border-bottom:1px solid rgba(255,255,255,.12);
  color:var(--gold-soft)}
.adm-side nav{display:flex;flex-direction:column;margin-top:14px}
.adm-side nav a{color:#C4CEE0;padding:11px 22px;font-size:15.5px}
.adm-side nav a:hover{background:rgba(255,255,255,.07);color:#fff}
.adm-side nav a.on{background:rgba(201,162,39,.15);color:var(--gold-soft);
  box-shadow:inset 3px 0 0 var(--gold)}
.adm-main{flex:1;padding:30px 36px;min-width:0}
.adm-title{font-size:25px;margin-bottom:22px}
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:16px;margin-bottom:28px}
.stat-card{background:var(--card);border-radius:var(--radius);padding:18px 20px;
  box-shadow:var(--shadow);border-top:3px solid var(--gold)}
.stat-card .n{font-family:'Trirong',serif;font-size:32px;font-weight:700;color:var(--navy)}
.stat-card .l{font-size:14.5px;color:var(--ink-dim)}
.filter-bar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}
.filter-bar a{padding:6px 14px;border-radius:99px;background:#fff;border:1px solid var(--line);font-size:14.5px}
.filter-bar a.on{background:var(--navy);color:#fff;border-color:var(--navy)}
.inline-form{display:flex;gap:10px;align-items:end;flex-wrap:wrap;background:var(--card);
  padding:16px 20px;border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:22px}
.inline-form label{margin:0 0 4px}
.inline-form .fld{display:flex;flex-direction:column}

/* ---------- Responsive ---------- */
@media (max-width:760px){
  .masthead-in{justify-content:center;text-align:center}
  .adm-shell{flex-direction:column}
  .adm-side{width:100%;padding:10px 0}
  .adm-side nav{flex-direction:row;flex-wrap:wrap;justify-content:center}
  .adm-main{padding:20px 16px}
  .art-page{padding:22px 20px}
  .kv b{width:96px}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important}
}