/*
Theme Name: Siam Yantra
Theme URI: https://siamyantra.com
Author: Siam Yantra
Description: ธีมเฉพาะของสยามยันต์ ออกแบบมาเพื่อเว็บที่เน้นบทความ โหลดเร็ว ฟอนต์เก็บบนเซิร์ฟเวอร์เราเอง ไม่มีโค้ดส่วนเกิน
Version: 1.0.0
Requires at least: 6.5
Requires PHP: 8.1
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: siam-yantra
*/

/* ============================================================
   1. ฟอนต์ — เก็บไว้บนเซิร์ฟเวอร์เราเอง ไม่ดึงจาก Google
   ============================================================ */
@font-face{font-family:'Trirong';font-style:normal;font-weight:400;font-display:swap;
  src:url('assets/fonts/trirong-thai-400-normal.woff2') format('woff2');
  unicode-range:U+0E01-0E5B,U+200C-200D,U+25CC;}
@font-face{font-family:'Trirong';font-style:normal;font-weight:400;font-display:swap;
  src:url('assets/fonts/trirong-latin-400-normal.woff2') format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215;}
@font-face{font-family:'Trirong';font-style:normal;font-weight:600;font-display:swap;
  src:url('assets/fonts/trirong-thai-600-normal.woff2') format('woff2');
  unicode-range:U+0E01-0E5B,U+200C-200D,U+25CC;}
@font-face{font-family:'Trirong';font-style:normal;font-weight:600;font-display:swap;
  src:url('assets/fonts/trirong-latin-600-normal.woff2') format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215;}

@font-face{font-family:'IBM Plex Sans Thai';font-style:normal;font-weight:400;font-display:swap;
  src:url('assets/fonts/ibm-plex-sans-thai-thai-400-normal.woff2') format('woff2');
  unicode-range:U+0E01-0E5B,U+200C-200D,U+25CC;}
@font-face{font-family:'IBM Plex Sans Thai';font-style:normal;font-weight:400;font-display:swap;
  src:url('assets/fonts/ibm-plex-sans-thai-latin-400-normal.woff2') format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215;}
@font-face{font-family:'IBM Plex Sans Thai';font-style:normal;font-weight:600;font-display:swap;
  src:url('assets/fonts/ibm-plex-sans-thai-thai-600-normal.woff2') format('woff2');
  unicode-range:U+0E01-0E5B,U+200C-200D,U+25CC;}
@font-face{font-family:'IBM Plex Sans Thai';font-style:normal;font-weight:600;font-display:swap;
  src:url('assets/fonts/ibm-plex-sans-thai-latin-600-normal.woff2') format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215;}

/* ============================================================
   2. โทเคน — ค่าสีมาจากไฟล์โลโก้จริง
   gold ห้ามใช้เป็นสีตัวอักษรบนพื้นครีม (ความต่าง 2.10:1)
   ให้ใช้ gold-text แทน (4.50:1 ผ่านเกณฑ์ WCAG AA)
   ============================================================ */
:root{
  --ivory:#FAF7ED;
  --ivory-2:#F3EEE0;
  --obsidian:#0E0E0B;
  --ink-soft:#575246;
  --ink-faint:#837C6C;
  --rule:#E3DCCA;
  --rule-fine:#EDE7D8;
  --gold:#C9A962;
  --gold-text:#8A6E2F;
  --gold-deep:#7E6428;

  --font-display:'Trirong',Georgia,'Times New Roman',serif;
  --font-body:'IBM Plex Sans Thai','IBM Plex Sans',system-ui,-apple-system,sans-serif;

  --w-wide:1140px;
  --w-text:720px;
  --r:2px;
}

/* ============================================================
   3. พื้นฐาน
   ============================================================ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:88px}
body{
  margin:0;background:var(--ivory);color:var(--obsidian);
  font-family:var(--font-body);font-size:17px;line-height:1.9;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--gold-text);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--gold-deep)}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible{
  outline:2px solid var(--gold-text);outline-offset:3px}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:600;line-height:1.3;margin:0 0 .5em;text-wrap:balance}
h1{font-size:clamp(30px,4.6vw,46px);font-weight:400;line-height:1.2}
h2{font-size:clamp(23px,3vw,30px)}
h3{font-size:clamp(19px,2.2vw,23px)}
p,ul,ol{margin:0 0 1.35em}
hr{border:0;border-top:1px solid var(--rule);margin:2.5em 0}
blockquote{margin:2em 0;padding:.2em 0 .2em 1.4em;border-left:3px solid var(--gold);
  font-family:var(--font-display);font-size:1.1em;color:var(--ink-soft)}
code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9em;
  background:var(--ivory-2);border:1px solid var(--rule-fine);padding:1px 5px}
table{border-collapse:collapse;width:100%;font-size:.94em}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--rule-fine);vertical-align:top}
thead th{border-bottom:1px solid var(--rule);font-weight:600;background:var(--ivory-2)}
.table-scroll{overflow-x:auto;border:1px solid var(--rule);margin:1.6em 0}
.table-scroll table{min-width:520px}

.wrap{max-width:var(--w-wide);margin:0 auto;padding-inline:20px}
.wrap--text{max-width:var(--w-text)}
.skip-link{position:absolute;left:-9999px}
.skip-link:focus{left:16px;top:16px;z-index:999;background:var(--obsidian);color:var(--ivory);padding:10px 16px}
.screen-reader-text{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ============================================================
   4. หัวเว็บ
   ============================================================ */
.site-header{position:sticky;top:0;z-index:50;background:rgba(250,247,237,.94);
  backdrop-filter:saturate(1.2) blur(8px);border-bottom:1px solid var(--rule)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;
  min-height:72px;max-width:var(--w-wide);margin:0 auto;padding-inline:20px}
.site-logo{display:flex;align-items:center;gap:12px;text-decoration:none;color:inherit;flex-shrink:0}
.site-logo img{height:44px;width:auto;aspect-ratio:1;object-fit:contain}
.site-logo .wordmark{display:grid;line-height:1.15}
.site-logo .th{font-family:var(--font-display);font-size:21px;font-weight:600}
.site-logo .en{font-size:10.5px;letter-spacing:.22em;text-transform:uppercase;color:var(--ink-faint)}

.nav-toggle{display:none;background:none;border:1px solid var(--rule);padding:9px 12px;
  border-radius:var(--r);cursor:pointer;font:inherit;font-size:14px;color:var(--obsidian)}
.main-nav ul{display:flex;gap:26px;list-style:none;margin:0;padding:0}
.main-nav a{color:var(--obsidian);text-decoration:none;font-size:15.5px;font-weight:500;
  padding:6px 0;border-bottom:2px solid transparent}
.main-nav a:hover,.main-nav .current-menu-item>a{color:var(--gold-text);border-bottom-color:var(--gold)}

@media(max-width:900px){
  .nav-toggle{display:block}
  .main-nav{display:none;position:absolute;left:0;right:0;top:100%;background:var(--ivory);
    border-bottom:1px solid var(--rule);padding:12px 20px 18px}
  .main-nav.is-open{display:block}
  .main-nav ul{flex-direction:column;gap:2px}
  .main-nav a{display:block;padding:11px 0;border-bottom:1px solid var(--rule-fine)}
}

/* ============================================================
   5. ปุ่ม
   ============================================================ */
.btn{display:inline-flex;align-items:center;gap:9px;padding:13px 26px;border-radius:var(--r);
  font-family:var(--font-body);font-size:15.5px;font-weight:600;text-decoration:none;
  border:1px solid transparent;cursor:pointer;transition:background .15s,color .15s}
.btn--primary{background:var(--gold);color:var(--obsidian)}
.btn--primary:hover{background:var(--gold-deep);color:var(--ivory)}
.btn--ghost{border-color:var(--rule);color:var(--obsidian);background:transparent}
.btn--ghost:hover{border-color:var(--gold);color:var(--gold-text)}
.btn--on-dark{background:var(--gold);color:var(--obsidian)}
/* ปุ่มบนพื้นเข้ม ต้องชนะกฎ .dark a ที่มีน้ำหนักสูงกว่า ไม่งั้นตัวอักษรทองทับพื้นทองจนอ่านไม่ออก */
.dark a.btn--primary,.dark a.btn--on-dark{color:var(--obsidian)}
.dark a.btn--on-dark:hover{color:var(--obsidian)}
.btn--on-dark:hover{background:#DCBF7E}

/* ============================================================
   6. ส่วนพื้นดำ — ใช้เฉพาะ hero งานชิ้นใหญ่ และ footer
   ทองบนพื้นดำผ่านเกณฑ์ 8.59:1 จึงใช้เป็นตัวอักษรได้
   ============================================================ */
.dark{background:var(--obsidian);color:var(--ivory)}
.dark h1,.dark h2,.dark h3{color:var(--ivory)}
.dark a{color:var(--gold)}
.dark .eyebrow{color:var(--gold)}
.dark .lede{color:#C6C0B1}

.eyebrow{font-size:11.5px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--gold-text);font-weight:600;margin-bottom:14px}
.lede{font-size:18px;color:var(--ink-soft);max-width:62ch}

.section{padding:clamp(52px,8vw,88px) 0}
.section--tight{padding:clamp(36px,5vw,56px) 0}
.section-head{margin-bottom:34px}
.section-head h2{margin-bottom:.35em}

/* ============================================================
   7. หน้าแรก
   ============================================================ */
.hero{padding:clamp(56px,9vw,104px) 0}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(30px,5vw,64px);align-items:center}
.hero h1{margin-bottom:.45em}
.hero .lede{color:#C6C0B1;font-size:18.5px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.hero-figure img{width:100%;border:1px solid rgba(201,169,98,.35)}
@media(max-width:860px){.hero-grid{grid-template-columns:1fr}}

.pillars{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:1px;
  background:var(--rule);border:1px solid var(--rule)}
.pillar{background:var(--ivory);padding:26px 24px}
.pillar h3{font-size:19px;margin-bottom:.4em}
.pillar p{font-size:15px;color:var(--ink-soft);margin:0}
.pillar .num{font-family:ui-monospace,monospace;font-size:11px;letter-spacing:.14em;
  color:var(--gold-text);display:block;margin-bottom:10px}


/* ============================================================
   8. บทความ — หัวใจของเว็บนี้
   ============================================================ */
.breadcrumb{font-size:13.5px;color:var(--ink-faint);margin-bottom:22px}
.breadcrumb a{color:var(--ink-soft);text-decoration:none}
.breadcrumb a:hover{color:var(--gold-text);text-decoration:underline}
.breadcrumb .sep{margin:0 7px;color:var(--rule)}

.entry-header{margin-bottom:30px}
.entry-meta{font-size:13.5px;color:var(--ink-faint);display:flex;gap:16px;flex-wrap:wrap;margin-top:12px}
.entry-cat a{color:var(--gold-text);text-decoration:none;font-weight:600}
.entry-thumb{margin:0 0 34px}
.entry-thumb img{width:100%}

.entry-content{font-size:17.5px}
.entry-content h2{margin-top:2em;padding-top:.2em}
.entry-content h3{margin-top:1.6em}
.entry-content ul,.entry-content ol{padding-left:1.4em}
.entry-content li{margin-bottom:.45em}
.entry-content img{margin:1.8em auto}
.entry-content figure{margin:1.8em 0}
.entry-content figcaption{font-size:13.5px;color:var(--ink-faint);text-align:center;margin-top:8px}
.entry-content strong{font-weight:600}

/* สารบัญ */
.toc{border:1px solid var(--rule);background:var(--ivory-2);padding:20px 24px;margin:0 0 34px}
.toc__title{font-family:var(--font-display);font-size:17px;font-weight:600;margin:0 0 10px}
.toc ol{list-style:none;counter-reset:toc;margin:0;padding:0}
.toc li{counter-increment:toc;margin-bottom:7px;font-size:15px;padding-left:26px;position:relative}
.toc li::before{content:counter(toc,decimal-leading-zero);position:absolute;left:0;
  font-family:ui-monospace,monospace;font-size:11.5px;color:var(--gold-text);top:3px}
.toc a{color:var(--obsidian);text-decoration:none}
.toc a:hover{color:var(--gold-text);text-decoration:underline}

/* กล่องผู้เขียน */
.author-box{margin:48px 0 0;border-top:2px solid var(--gold);padding-top:22px;
  display:grid;grid-template-columns:auto 1fr;gap:18px;align-items:start}
.author-box img{width:64px;height:64px;border-radius:50%;object-fit:cover}
.author-box h4{font-family:var(--font-display);font-size:18px;margin:0 0 5px}
.author-box p{font-size:15px;color:var(--ink-soft);margin:0 0 10px}
@media(max-width:600px){.author-box{grid-template-columns:1fr}}

/* บทความที่เกี่ยวข้อง */
.related{margin-top:56px;border-top:1px solid var(--rule);padding-top:32px}
.related h2{font-size:22px;margin-bottom:20px}
.related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px}
.related-card{text-decoration:none;color:inherit;display:block}
.related-card img{aspect-ratio:16/10;object-fit:cover;width:100%;margin-bottom:11px;border:1px solid var(--rule)}
.related-card .t{font-family:var(--font-display);font-size:17px;line-height:1.35;margin-bottom:4px}
.related-card .d{font-size:13px;color:var(--ink-faint)}
.related-card:hover .t{color:var(--gold-text)}

/* แถบปิดท้ายบทความ */
.post-cta{margin-top:48px;background:var(--obsidian);color:var(--ivory);padding:34px 30px;text-align:center}
.post-cta h3{color:var(--ivory);font-size:23px;margin-bottom:.5em}
.post-cta p{color:#C6C0B1;font-size:15.5px;max-width:52ch;margin:0 auto 22px}

/* ============================================================
   9. รายการบทความ
   ============================================================ */
.post-list{display:grid;gap:34px}
.post-item{display:grid;grid-template-columns:240px 1fr;gap:24px;
  border-bottom:1px solid var(--rule-fine);padding-bottom:34px}
.post-item:last-child{border-bottom:0}
.post-item img{aspect-ratio:16/10;object-fit:cover;width:100%;border:1px solid var(--rule)}
.post-item h2{font-size:23px;margin-bottom:.3em}
.post-item h2 a{color:inherit;text-decoration:none}
.post-item h2 a:hover{color:var(--gold-text)}
.post-item .excerpt{font-size:15.5px;color:var(--ink-soft);margin:0}
@media(max-width:700px){.post-item{grid-template-columns:1fr}}

.pagination{display:flex;gap:8px;flex-wrap:wrap;margin-top:44px}
.pagination .page-numbers{display:inline-flex;align-items:center;justify-content:center;
  min-width:42px;height:42px;padding:0 12px;border:1px solid var(--rule);
  text-decoration:none;color:var(--obsidian);font-size:15px}
.pagination .current{background:var(--gold);border-color:var(--gold);font-weight:600}
.pagination a:hover{border-color:var(--gold);color:var(--gold-text)}

/* ============================================================
   10. ฟอร์มค้นหา
   ============================================================ */
.search-form{display:flex;gap:8px}
.search-form input[type=search]{flex:1;padding:11px 14px;border:1px solid var(--rule);
  background:var(--ivory);font:inherit;font-size:15px;border-radius:var(--r);color:var(--obsidian)}

/* ============================================================
   11. ท้ายเว็บ
   ============================================================ */
.site-footer{background:var(--obsidian);color:var(--ivory);padding:56px 0 30px;margin-top:80px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:38px}
.footer-grid h4{font-family:var(--font-display);font-size:17px;color:var(--gold);margin-bottom:14px}
.site-footer a{color:var(--ivory);text-decoration:none;font-size:15px}
.site-footer a:hover{color:var(--gold)}
.site-footer ul{list-style:none;margin:0;padding:0;display:grid;gap:9px}
.footer-about p{color:#C6C0B1;font-size:15px;max-width:38ch}
.footer-logo{display:flex;align-items:center;gap:11px;margin-bottom:14px}
.footer-logo img{height:40px;width:auto}
.footer-bottom{border-top:1px solid #2A2820;margin-top:38px;padding-top:20px;
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:#8B8577}
@media(max-width:820px){.footer-grid{grid-template-columns:1fr;gap:30px}}

/* ============================================================
   12. ช่องทางติดต่อแยกตามประเทศ
   ============================================================ */
.channels{display:grid;grid-template-columns:repeat(auto-fit,minmax(215px,1fr));gap:1px;
  background:var(--rule);border:1px solid var(--rule)}
.channel{background:var(--ivory);padding:20px 22px}
.channel .region{font-size:12px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--ink-faint);margin-bottom:7px}
.channel .app{font-family:var(--font-display);font-size:19px;margin-bottom:4px}
.channel .handle{font-size:14.5px;color:var(--ink-soft)}

/* ============================================================
   13. 404 และหน้าทั่วไป
   ============================================================ */
.page-hero{padding:clamp(40px,6vw,66px) 0 0}
.error-404{text-align:center;padding:clamp(60px,10vw,120px) 0}

@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
}

/* บล็อกของ WordPress ที่ใช้บ่อย */
.wp-block-image{margin:1.8em 0}
.alignwide{max-width:var(--w-wide)}
.aligncenter{margin-inline:auto}
.wp-caption-text{font-size:13.5px;color:var(--ink-faint);text-align:center}

/* ============================================================
   14. ผลงาน
   ============================================================ */
.work-filter{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 34px}
.work-filter a{display:inline-block;padding:7px 15px;border:1px solid var(--rule);
  font-size:14.5px;color:var(--ink-soft);text-decoration:none;transition:border-color .15s,color .15s}
.work-filter a:hover{border-color:var(--gold);color:var(--gold-text)}
.work-filter a.is-on{background:var(--obsidian);border-color:var(--obsidian);color:var(--ivory)}

.work-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(258px,1fr));gap:34px 26px}
.work-grid--tight{gap:24px 20px;grid-template-columns:repeat(auto-fill,minmax(196px,1fr))}

.work-card{display:block;text-decoration:none;color:inherit}
.work-card__img{display:block;position:relative;aspect-ratio:1;overflow:hidden;
  background:var(--ivory-2);border:1px solid var(--rule-fine)}
.work-card__img img{width:100%;height:100%;object-fit:cover;display:block;
  transition:transform .5s cubic-bezier(.2,.7,.3,1)}
.work-card:hover .work-card__img img{transform:scale(1.035)}
.work-card__t{display:block;font-family:var(--font-display);font-size:18px;line-height:1.35;
  margin-top:13px;color:var(--obsidian)}
.work-card:hover .work-card__t{color:var(--gold-text)}
.work-card__m{display:block;font-size:13.5px;color:var(--ink-faint);margin-top:4px}

.work-single{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);
  gap:clamp(30px,5vw,64px);align-items:start;margin-bottom:clamp(50px,8vw,90px)}
.work-single__img{background:var(--ivory-2);border:1px solid var(--rule-fine)}
.work-single__img img{width:100%;height:auto;display:block}
.work-single__body h1{margin:.15em 0 .5em}
.work-single__body .entry-content{font-size:17px}
.work-single__note{font-size:13.5px;color:var(--ink-faint);border-left:2px solid var(--rule);
  padding-left:14px;margin:26px 0 28px}

.work-specs{margin:26px 0 0;border-top:1px solid var(--rule)}
.work-specs>div{display:grid;grid-template-columns:110px 1fr;gap:14px;
  padding:11px 0;border-bottom:1px solid var(--rule-fine)}
.work-specs dt{font-size:13.5px;color:var(--ink-faint);margin:0}
.work-specs dd{font-size:15px;color:var(--obsidian);margin:0}

@media(max-width:820px){
  .work-single{grid-template-columns:1fr}
  .work-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:26px 16px}
  .work-card__t{font-size:16px}
}