/*
 Theme Name: 72chg
 Theme URI: https://www.72chg.com
 Description: 72chg · AI 技術培訓與資訊平台（ai-automation 子主題）
 Template: ai-automation
 Version: 1.0
 Author: 72chg
 Text Domain: chg
*/

:root{
  --chg-indigo:#4F46E5;
  --chg-cyan:#06B6D4;
  --chg-ink:#0B1020;
  --chg-navy2:#11172E;
  --chg-paper:#FFFFFF;
  --chg-muted:#6B7280;
  --chg-line:#E5E7EB;
  --chg-soft:#F5F7FF;
  --chg-grad:linear-gradient(135deg,#4F46E5 0%,#06B6D4 100%);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;padding:0;
  font-family:'Noto Sans TC','Helvetica Neue',Arial,sans-serif;
  color:#1F2937;background:#fff;line-height:1.65;
  -ms-word-wrap:break-word;word-wrap:break-word;overflow-x:hidden;
}
a{text-decoration:none;color:inherit}
img{max-width:100%;height:auto}
h1,h2,h3,h4,h5{line-height:1.25;font-weight:700;color:var(--chg-ink)}
p{margin:0 0 1em}

.chg-container{max-width:1180px;margin:0 auto;padding:0 24px}
.chg-btn{display:inline-block;padding:13px 28px;border-radius:999px;font-weight:700;font-size:15px;cursor:pointer;border:none;transition:.2s;text-align:center}
.chg-btn-primary{background:var(--chg-grad);color:#fff;box-shadow:0 8px 24px rgba(79,70,229,.35)}
.chg-btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(79,70,229,.45);color:#fff}
.chg-btn-ghost{background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.4)}
.chg-btn-ghost:hover{background:rgba(255,255,255,.22);color:#fff}
.chg-tag{display:inline-block;font-size:12px;font-weight:700;color:var(--chg-indigo);background:#EEF0FF;padding:5px 14px;border-radius:999px;letter-spacing:.3px}

/* ===== HEADER ===== */
.chg-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--chg-line)}
.chg-header .chg-container{display:flex;align-items:center;justify-content:space-between;height:78px}
.chg-logo{display:inline-flex;align-items:center;font-weight:900;font-size:24px;letter-spacing:-.5px;color:var(--chg-ink)}
.chg-logo-img{height:60px;width:auto;display:block}
.chg-footer-logo{display:inline-block;background:#fff;border-radius:14px;padding:6px;line-height:0}
.chg-footer-logo img{height:52px;width:auto;display:block}
.chg-nav{display:flex;gap:30px;font-weight:500;font-size:15px;align-items:center}
.chg-nav a{color:#374151;transition:.2s}
.chg-nav a:hover,.chg-nav .current-menu-item>a{color:var(--chg-indigo)}
.chg-nav .chg-btn{padding:9px 22px;font-size:14px}
.chg-burger{display:none;background:none;border:none;font-size:26px;cursor:pointer;color:var(--chg-ink)}
@media(max-width:900px){
  .chg-nav{position:absolute;top:70px;left:0;right:0;background:#fff;flex-direction:column;gap:0;padding:10px 24px 20px;border-bottom:1px solid var(--chg-line);display:none}
  .chg-nav.open{display:flex}
  .chg-nav a{padding:12px 0;width:100%;border-bottom:1px solid var(--chg-soft)}
  .chg-burger{display:block}
}

/* ===== HERO ===== */
.chg-hero{position:relative;overflow:hidden;background:radial-gradient(1200px 600px at 70% -10%,rgba(6,182,212,.28),transparent),linear-gradient(180deg,var(--chg-ink) 0%,var(--chg-navy2) 100%);color:#fff;padding:96px 0 104px}
.chg-hero:after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(79,70,229,.18),transparent 42%);pointer-events:none}
.chg-hero .chg-container{position:relative;z-index:2;display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.chg-hero-copy{max-width:640px}
.chg-hero h1{font-size:54px;font-weight:900;line-height:1.14;margin:18px 0 20px}
.chg-hero h1 .hl{background:var(--chg-grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.chg-hero p{font-size:19px;color:#C7D0E8;margin-bottom:34px}
.chg-hero .chg-cta{display:flex;gap:16px;flex-wrap:wrap}
.chg-hero-art{position:relative;display:flex;justify-content:center;align-items:center}
.chg-hero-art img{width:100%;max-width:520px;height:auto;filter:drop-shadow(0 20px 60px rgba(79,70,229,.45))}
.chg-orb{position:absolute;right:-90px;top:50px;width:440px;height:440px;border-radius:50%;background:var(--chg-grad);filter:blur(90px);opacity:.5}
@media(max-width:860px){
  .chg-hero .chg-container{grid-template-columns:1fr;gap:24px;text-align:left}
  .chg-hero-art{order:-1;margin-bottom:8px}
  .chg-hero-art img{max-width:340px}
}
@media(max-width:600px){.chg-hero h1{font-size:38px}.chg-hero{padding:72px 0 84px}}

/* ===== STATS ===== */
.chg-stats{background:var(--chg-soft);border-bottom:1px solid var(--chg-line)}
.chg-stats .chg-container{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:36px 24px}
.chg-stat{text-align:center}
.chg-stat b{display:block;font-size:36px;font-weight:900;background:var(--chg-grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.chg-stat span{color:var(--chg-muted);font-size:14px}
@media(max-width:600px){.chg-stats .chg-container{grid-template-columns:1fr 1fr;gap:18px}}

/* ===== SECTIONS ===== */
.chg-section{padding:84px 0}
.chg-section--soft{background:var(--chg-soft)}
.chg-sec-head{text-align:center;max-width:680px;margin:0 auto 50px}
.chg-sec-head h2{font-size:34px;font-weight:900;margin:14px 0 10px}
.chg-sec-head p{color:var(--chg-muted);font-size:16px}
.chg-sec-head .chg-tag{margin-bottom:6px}

/* Repeating dot-grid pattern (subtle), used by several sections. */
.chg-dots{
  background-image:radial-gradient(rgba(79,70,229,.10) 1px, transparent 1px);
  background-size:22px 22px;
}

/* Neural-network / particle AI pattern overlay (semi-transparent),
   layered on top of each section's gradient base. */
.chg-neural{position:relative;overflow:hidden}
.chg-neural:before{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:url("assets/img/ai-net.svg");
  background-size:760px 760px;
  background-position:center top;
  background-repeat:repeat;
  opacity:.16;
}
.chg-neural > .chg-container{position:relative;z-index:1}

/* Per-section AI background images (each section gets its own themed art). */
.chg-bg-courses.chg-neural:before{
  background-image:url("assets/img/ai-courses.svg");
  background-position:top right;background-size:900px auto;opacity:.30;
}
.chg-bg-articles.chg-neural:before{
  background-image:url("assets/img/ai-articles.svg");
  background-position:top left;background-size:900px auto;opacity:.30;
}
.chg-bg-features.chg-neural:before{
  background-image:url("assets/img/ai-features.svg");
  background-position:top right;background-size:860px auto;opacity:.32;
}
.chg-bg-cta.chg-neural:before{
  background-image:url("assets/img/ai-cta.svg");
  background-position:top right;background-size:820px auto;opacity:.34;
}
.chg-bg-testimonials.chg-neural:before{
  background-image:url("assets/img/ai-testimonials.svg");
  background-position:top right;background-size:900px auto;opacity:.34;
}
.chg-bg-courses{
  background:
    radial-gradient(900px 460px at 85% -5%, rgba(6,182,212,.16), transparent 60%),
    radial-gradient(700px 420px at 0% 100%, rgba(79,70,229,.12), transparent 60%),
    linear-gradient(180deg,#ECEFFE 0%, #F6F8FF 100%);
}
.chg-bg-courses.chg-dots{
  background-image:radial-gradient(rgba(79,70,229,.08) 1px, transparent 1px);
  background-size:22px 22px;
  background-color:#F6F8FF;
}
.chg-section--soft.chg-bg-articles,
.chg-bg-articles{
  background:
    radial-gradient(800px 400px at 12% 0%, rgba(79,70,229,.13), transparent 60%),
    radial-gradient(700px 420px at 100% 100%, rgba(6,182,212,.10), transparent 60%),
    linear-gradient(180deg,#EFF2FD 0%, #E7ECFA 100%);
}
.chg-bg-features{
  background:
    linear-gradient(180deg,#F4F6FE 0%, #FBFCFF 100%);
  position:relative;
}
.chg-bg-features:before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(rgba(6,182,212,.12) 1px, transparent 1px);
  background-size:24px 24px;opacity:.7;
}
.chg-bg-cta{background:linear-gradient(180deg,#EEF1FB 0%, #E6EAF8 100%)}
.chg-bg-testimonials{
  background:
    radial-gradient(900px 460px at 50% 120%, rgba(79,70,229,.15), transparent 60%),
    radial-gradient(800px 420px at 0% 0%, rgba(6,182,212,.10), transparent 60%),
    linear-gradient(180deg,#EEF2FE 0%, #E8ECFA 100%);
}

/* ===== GRID / CARDS ===== */
.chg-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.chg-card{background:#fff;border:1px solid var(--chg-line);border-radius:18px;overflow:hidden;transition:.22s;box-shadow:0 2px 10px rgba(17,24,46,.04);display:flex;flex-direction:column}
.chg-card:hover{transform:translateY(-6px);box-shadow:0 18px 42px rgba(17,24,46,.13)}
.chg-card-thumb{height:152px;background:var(--chg-grad);display:flex;align-items:center;justify-content:center;color:#fff;font-size:26px;font-weight:900;letter-spacing:.5px}
.chg-card-body{padding:22px;display:flex;flex-direction:column;flex:1}
.chg-card-body h3{font-size:19px;margin:10px 0 8px}
.chg-card-body p{color:var(--chg-muted);font-size:14px;flex:1}
.chg-card-meta{display:flex;gap:14px;flex-wrap:wrap;font-size:13px;color:var(--chg-muted);margin:14px 0 0;border-top:1px solid var(--chg-line);padding-top:14px}
.chg-card-meta b{color:var(--chg-ink);font-weight:700}
.chg-card a.chg-more{margin-top:14px;color:var(--chg-indigo);font-weight:700;font-size:14px}
@media(max-width:900px){.chg-grid{grid-template-columns:1fr 1fr}.chg-section{padding:60px 0}}
@media(max-width:600px){.chg-grid{grid-template-columns:1fr}}

/* ===== FEATURES ===== */
.chg-feat{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.chg-feat-item{background:#fff;border:1px solid var(--chg-line);border-radius:16px;padding:30px}
.chg-ic{width:50px;height:50px;border-radius:13px;background:var(--chg-grad);display:flex;align-items:center;justify-content:center;color:#fff;font-size:22px;margin-bottom:16px}
.chg-feat-item h4{font-size:18px;margin-bottom:8px}
.chg-feat-item p{color:var(--chg-muted);font-size:14px}
@media(max-width:900px){.chg-feat{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.chg-feat{grid-template-columns:1fr}}

/* ===== ENTERPRISE CTA ===== */
.chg-ent{background:radial-gradient(800px 400px at 80% 0%,rgba(6,182,212,.22),transparent),linear-gradient(180deg,var(--chg-ink),var(--chg-navy2));color:#fff;border-radius:24px;padding:58px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:24px}
.chg-ent h2{font-size:30px;font-weight:900;color:#fff}
.chg-ent p{color:#C7D0E8;margin-top:8px;max-width:560px}
@media(max-width:600px){.chg-ent{padding:34px}}

/* ===== QUOTOTES ===== */
.chg-quotes{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.chg-quote{background:#fff;border:1px solid var(--chg-line);border-radius:16px;padding:28px}
.chg-quote p{font-size:15px;color:#374151}
.chg-quote-who{display:flex;align-items:center;gap:12px;margin-top:18px}
.chg-av{width:42px;height:42px;border-radius:50%;background:var(--chg-grad);flex:0 0 42px}
.chg-quote-who b{font-size:14px;display:block;color:var(--chg-ink)}
.chg-quote-who span{font-size:12px;color:var(--chg-muted)}
@media(max-width:900px){.chg-quotes{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.chg-quotes{grid-template-columns:1fr}}

/* ===== CONTENT PAGES (About / generic) ===== */
.chg-page-head{background:linear-gradient(180deg,var(--chg-ink),var(--chg-navy2));color:#fff;padding:80px 0 70px;text-align:center}
.chg-page-head h1{color:#fff;font-size:40px;font-weight:900}
.chg-page-head p{color:#C7D0E8;max-width:620px;margin:14px auto 0;font-size:17px}
.chg-prose{max-width:820px;margin:0 auto}
.chg-prose h2{font-size:26px;margin:36px 0 12px}
.chg-prose h3{font-size:20px;margin:26px 0 8px}
.chg-prose ul{margin:0 0 1em 1.2em}
.chg-prose li{margin:6px 0}
.chg-prose img{margin:18px 0;border-radius:14px}

/* ===== COURSE SINGLE ===== */
.chg-course-meta{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:0 0 30px}
.chg-meta-box{background:var(--chg-soft);border:1px solid var(--chg-line);border-radius:14px;padding:20px;text-align:center}
.chg-meta-box span{display:block;font-size:13px;color:var(--chg-muted);margin-bottom:6px}
.chg-meta-box b{font-size:22px;font-weight:900;background:var(--chg-grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.chg-course-hero{background:var(--chg-grad);color:#fff;padding:64px 0}
.chg-course-hero .chg-tag{background:rgba(255,255,255,.18);color:#fff}
.chg-course-hero h1{color:#fff;font-size:40px;font-weight:900;margin:14px 0 8px}
.chg-course-hero p{color:#EAF6FF;font-size:17px;max-width:640px}
@media(max-width:600px){.chg-course-meta{grid-template-columns:1fr}.chg-course-hero h1{font-size:30px}}

/* ===== BLOG ===== */
.chg-post{background:#fff;border:1px solid var(--chg-line);border-radius:16px;overflow:hidden;display:flex;flex-direction:column}
.chg-post-thumb{height:170px;background:linear-gradient(135deg,#11172E,#4F46E5)}
.chg-post-body{padding:22px}
.chg-post-body h3{font-size:18px;margin:8px 0}
.chg-post-body p{color:var(--chg-muted);font-size:14px}
.chg-post-body .chg-date{font-size:12px;color:var(--chg-cyan);font-weight:700}
.chg-single{max-width:760px;margin:0 auto}
.chg-single .chg-tag{margin-bottom:10px}
.chg-single h1{font-size:36px;font-weight:900;margin-bottom:10px}
.chg-single-meta{color:var(--chg-muted);font-size:14px;margin-bottom:24px}
.chg-single img{border-radius:14px;margin:20px 0}

/* ===== CONTACT FORM ===== */
.chg-form{display:grid;gap:16px;max-width:640px;margin:30px auto 0}
.chg-form label{font-weight:700;font-size:14px;color:var(--chg-ink)}
.chg-form input,.chg-form textarea{width:100%;padding:13px 15px;border:1px solid var(--chg-line);border-radius:12px;font-family:inherit;font-size:15px;background:#fff}
.chg-form input:focus,.chg-form textarea:focus{outline:none;border-color:var(--chg-indigo);box-shadow:0 0 0 3px rgba(79,70,229,.15)}
.chg-form textarea{min-height:140px;resize:vertical}
.chg-form .chg-note{text-align:center;color:var(--chg-muted);font-size:13px}
.chg-alert{padding:14px 18px;border-radius:12px;font-weight:600;max-width:640px;margin:20px auto}
.chg-alert--ok{background:#ECFDF5;color:#047857;border:1px solid #A7F3D0}
.chg-alert--err{background:#FEF2F2;color:#B91C1C;border:1px solid #FECACA}
.chg-info-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:30px auto;max-width:820px}
.chg-info-box{background:var(--chg-soft);border:1px solid var(--chg-line);border-radius:14px;padding:22px;text-align:center}
.chg-info-box b{display:block;font-size:16px;margin-bottom:4px;color:var(--chg-ink)}
.chg-info-box span{color:var(--chg-muted);font-size:14px}
@media(max-width:600px){.chg-info-grid{grid-template-columns:1fr}}

/* ===== FOOTER ===== */
.chg-footer{background:var(--chg-ink);color:#C7D0E8;padding:60px 0 30px}
.chg-footer-cols{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:30px}
.chg-footer .chg-logo{color:#fff;font-size:22px;margin-bottom:12px}
.chg-footer p.chg-blurb{font-size:14px;color:#9AA6C4;max-width:300px}
.chg-footer h5{color:#fff;font-size:15px;margin-bottom:14px}
.chg-footer a{display:block;color:#9AA6C4;font-size:14px;margin-bottom:9px;transition:.2s}
.chg-footer a:hover{color:#fff}
.chg-footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:38px;padding-top:20px;font-size:13px;color:#7B86A8;text-align:center}
@media(max-width:900px){.chg-footer-cols{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.chg-footer-cols{grid-template-columns:1fr}}