/* Article Update System - Blue professional theme */
:root{--blue-950:#041229;--blue-900:#071a3a;--blue-800:#0a3478;--blue-700:#0f4da8;--blue-600:#1769d4;--sky:#35b7ff;--gold:#ffc247;--red:#df1d27;--green:#16a34a;--white:#fff;--light:#f4f8ff;--text:#172033;--muted:#667085;--border:rgba(7,26,58,.12);--shadow:0 18px 45px rgba(4,18,41,.14);--radius:22px}
*{box-sizing:border-box}body{margin:0;font-family:"Prompt","Noto Sans Thai",Arial,sans-serif;background:var(--light);color:var(--text);line-height:1.7}a{text-decoration:none;color:inherit}img{max-width:100%;display:block}.container{width:min(1120px,calc(100% - 32px));margin:auto}
.header{background:linear-gradient(135deg,var(--blue-950),var(--blue-800));color:#fff;padding:26px 0}.header-row{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}.logo{font-size:24px;font-weight:900}.nav a{display:inline-flex;margin:4px;padding:10px 16px;border-radius:999px;background:rgba(255,255,255,.10);color:#fff;font-weight:800}.nav a:hover{background:rgba(255,255,255,.18)}
.hero{padding:54px 0;background:linear-gradient(135deg,var(--blue-950),var(--blue-700));color:#fff}.hero h1{font-size:clamp(34px,5vw,58px);line-height:1.12;margin:0 0 12px}.hero p{color:rgba(255,255,255,.82);font-size:18px;max-width:760px}.section{padding:58px 0}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.card img{height:190px;width:100%;object-fit:cover;background:linear-gradient(135deg,var(--blue-900),var(--blue-600))}.card-body{padding:24px}.card h2,.card h3{line-height:1.25;margin:0 0 10px;color:var(--blue-950)}.meta{font-size:13px;color:var(--blue-700);font-weight:900;margin-bottom:8px}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:11px 18px;border-radius:999px;background:linear-gradient(135deg,var(--sky),var(--blue-600));color:#fff;font-weight:900;border:0;cursor:pointer}.btn.gold{background:linear-gradient(135deg,var(--gold),#ffe19a);color:var(--blue-950)}.btn.red{background:linear-gradient(135deg,var(--red),#b91018)}
.form-card{max-width:980px;margin:30px auto;background:#fff;border:1px solid var(--border);border-radius:24px;box-shadow:var(--shadow);padding:26px}label{display:block;font-weight:900;color:var(--blue-950);margin:14px 0 6px}input,textarea,select{width:100%;padding:13px 14px;border:1px solid var(--border);border-radius:14px;font:inherit;background:#fff}textarea{min-height:160px;resize:vertical}.row{display:grid;grid-template-columns:1fr 1fr;gap:14px}.alert{padding:12px 16px;border-radius:14px;margin:12px 0;font-weight:800}.alert.ok{background:#dcfce7;color:#166534}.alert.err{background:#fee2e2;color:#991b1b}
.table{width:100%;border-collapse:collapse;background:#fff;border-radius:20px;overflow:hidden;box-shadow:var(--shadow)}.table th,.table td{padding:14px;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}.table th{background:var(--blue-900);color:#fff}.footer{padding:28px 0;background:#020b1d;color:rgba(255,255,255,.78);text-align:center}.article-wrap{max-width:900px;margin:auto;background:#fff;border-radius:28px;box-shadow:var(--shadow);padding:34px}.article-wrap h1{font-size:clamp(32px,4vw,52px);line-height:1.15;color:var(--blue-950)}.article-wrap .cover{border-radius:22px;margin:18px 0;max-height:460px;width:100%;object-fit:cover}.article-content{font-size:18px}.article-content h2{color:var(--blue-950);margin-top:30px}
@media(max-width:900px){.grid{grid-template-columns:repeat(2,1fr)}.row{grid-template-columns:1fr}}@media(max-width:640px){.grid{grid-template-columns:1fr}.section{padding:42px 0}.form-card,.article-wrap{padding:20px;border-radius:20px}.table{font-size:14px}.table th:nth-child(3),.table td:nth-child(3){display:none}}