/* ===== Lớp Học Thầy Tiến — main.css ===== */

/* ── RESET & BASE ───────────────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Be Vietnam Pro',sans-serif;color:#1a1a2e;background:#fff;overflow-x:hidden}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
button{cursor:pointer;font-family:inherit}

/* ── VARIABLES ──────────────────────────────────────────────────────────── */
:root{
  --navy:#0d2b6e;
  --navy-dark:#071a45;
  --navy-light:#1a4da0;
  --gold:#f0a500;
  --gold-light:#fff4d6;
  --white:#ffffff;
  --gray-bg:#f5f8ff;
  --gray-text:#666;
  --text:#1a1a2e;
  --radius:12px;
  --shadow:0 4px 24px rgba(13,43,110,0.10);
  --shadow-lg:0 8px 40px rgba(13,43,110,0.16);
}

/* ── UTILITIES ──────────────────────────────────────────────────────────── */
.container{max-width:1140px;margin:0 auto;padding:0 24px}
.section{padding:72px 0}
.section-label{color:var(--gold);font-size:12px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;margin-bottom:8px}
.section-title{color:var(--navy);font-size:clamp(24px,4vw,36px);font-weight:800;line-height:1.2;margin-bottom:12px}
.section-sub{color:var(--gray-text);font-size:15px;line-height:1.7;max-width:600px}
.text-center{text-align:center}
.text-center .section-sub{margin:0 auto}
.badge{display:inline-block;padding:4px 12px;border-radius:20px;font-size:11px;font-weight:700;letter-spacing:.5px}
.badge-gold{background:var(--gold);color:var(--navy)}
.badge-blue{background:rgba(13,43,110,.08);color:var(--navy)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 28px;border-radius:8px;font-size:15px;font-weight:700;border:none;transition:all .2s}
.btn-primary{background:var(--gold);color:var(--navy)}
.btn-primary:hover{background:#d49200;transform:translateY(-1px)}
.btn-outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.5)}
.btn-outline:hover{background:rgba(255,255,255,.1);border-color:#fff}
.btn-navy{background:var(--navy);color:#fff}
.btn-navy:hover{background:var(--navy-dark);transform:translateY(-1px)}
.tag{display:inline-block;background:rgba(240,165,0,.15);color:#7a5200;font-size:12px;font-weight:600;padding:3px 10px;border-radius:20px}

/* ── IMG PLACEHOLDER ────────────────────────────────────────────────────── */
.img-cover{width:100%;height:100%;object-fit:cover;object-position:center}
.img-box{background:linear-gradient(135deg,var(--navy) 0%,var(--navy-light) 100%);position:relative;overflow:hidden}
.img-box img{width:100%;height:100%;object-fit:cover;object-position:top center}

/* ── NAVBAR ─────────────────────────────────────────────────────────────── */
#navbar{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(7,26,69,.96);backdrop-filter:blur(12px);transition:all .3s}
#navbar.scrolled{box-shadow:0 2px 20px rgba(0,0,0,.3)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.nav-logo{display:flex;align-items:center;gap:10px}
.logo-fire{width:38px;height:38px;background:var(--gold);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0}
.logo-text{color:#fff;font-weight:800;font-size:15px;line-height:1.2}
.logo-sub{font-size:10px;color:rgba(240,192,96,.9);font-weight:500;display:block}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{color:rgba(255,255,255,.8);font-size:13px;font-weight:500;padding:6px 12px;border-radius:6px;transition:all .2s}
.nav-links a:hover{color:#fff;background:rgba(255,255,255,.1)}
.nav-cta{background:var(--gold);color:var(--navy)!important;font-weight:700!important;border-radius:6px}
.nav-cta:hover{background:#d49200!important}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:none;padding:8px;cursor:pointer}
.hamburger span{display:block;width:24px;height:2px;background:#fff;transition:all .3s}
.mobile-menu{display:none;position:fixed;top:68px;left:0;right:0;background:var(--navy-dark);padding:16px 24px;z-index:999;border-top:1px solid rgba(255,255,255,.1)}
.mobile-menu a{display:block;color:rgba(255,255,255,.85);font-size:15px;font-weight:500;padding:12px 0;border-bottom:1px solid rgba(255,255,255,.08)}
.mobile-menu a:last-child{border:none;margin-top:8px}
.mobile-menu .nav-cta{display:block;text-align:center;margin-top:8px;padding:12px;border-radius:8px}

/* ── HERO ───────────────────────────────────────────────────────────────── */
#hero{min-height:100vh;position:relative;display:flex;align-items:center;padding-top:68px;background:var(--navy)}
/* NOTE: .hero-bg URL is set dynamically via JS from /api/settings hero_image */
.hero-bg{position:absolute;inset:0;background:url('/images/hero-classroom.webp') center/cover no-repeat;opacity:.3}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(7,26,69,.92) 0%,rgba(13,43,110,.75) 60%,rgba(7,26,69,.85) 100%)}
.hero-content{position:relative;z-index:2;display:grid;grid-template-columns:1fr 400px;gap:48px;align-items:center;padding:60px 0}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(240,165,0,.15);border:1px solid rgba(240,165,0,.3);color:var(--gold);font-size:12px;font-weight:700;padding:6px 14px;border-radius:20px;margin-bottom:20px;letter-spacing:.5px}
/* Khớp cả #hero lẫn .hero: markup dùng <section id="hero">, nên selector cũ
   chỉ viết ".hero h1" không bao giờ khớp — h1 rơi về màu tiêu đề tối mặc định
   (#1a1a2e) nằm trên nền hero xanh đậm, tương phản chỉ 1.17:1 (AA cần ≥3:1),
   tiêu đề gần như chìm hẳn vào nền. */
#hero h1,.hero h1{color:#fff;font-size:clamp(32px,5vw,56px);font-weight:900;line-height:1.1;margin-bottom:16px}
#hero h1 .accent,.hero h1 .accent{color:var(--gold)}
.hero-desc{color:rgba(255,255,255,.8);font-size:16px;line-height:1.7;margin-bottom:28px;max-width:520px}
.hero-btns{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:40px}
.hero-stats{display:flex;gap:0;border-top:1px solid rgba(255,255,255,.12);padding-top:32px}
.hero-stat{flex:1;text-align:center;padding:0 16px;border-right:1px solid rgba(255,255,255,.12)}
.hero-stat:last-child{border:none}
.hero-stat-num{color:var(--gold);font-size:32px;font-weight:900;line-height:1}
.hero-stat-lbl{color:rgba(255,255,255,.6);font-size:11px;margin-top:4px}
.hero-card{background:rgba(255,255,255,.07);backdrop-filter:blur(16px);border:1px solid rgba(255,255,255,.15);border-radius:20px;overflow:hidden}
.hero-card-img{height:320px;background:var(--navy-light)}
.hero-card-img img{width:100%;height:100%;object-fit:cover;object-position:top}
.hero-card-body{padding:20px}
.hero-card-name{color:#fff;font-weight:800;font-size:16px}
.hero-card-role{color:rgba(240,192,96,.9);font-size:13px;margin-top:2px}
.hero-card-tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}
.hero-card-tag{background:rgba(240,165,0,.2);color:var(--gold);font-size:11px;padding:3px 10px;border-radius:20px;font-weight:600}

/* ── MARQUEE ────────────────────────────────────────────────────────────── */
.marquee-bar{background:var(--gold);padding:10px 0;overflow:hidden}
.marquee-inner{display:flex;gap:48px;animation:marquee 25s linear infinite;white-space:nowrap}
.marquee-inner:hover{animation-play-state:paused}
.marquee-item{color:var(--navy);font-size:13px;font-weight:700;display:flex;align-items:center;gap:8px;white-space:nowrap}
@keyframes marquee{0%{transform:translateX(0)}100%{transform:translateX(-50%)}}

/* ── WHY US ─────────────────────────────────────────────────────────────── */
#why{background:var(--gray-bg)}
.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:48px}
.why-card{background:#fff;border-radius:var(--radius);padding:24px 20px;border:1px solid #e8eef8;transition:all .2s}
.why-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.why-icon{width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:16px}
.why-title{font-weight:700;font-size:15px;color:var(--navy);margin-bottom:6px}
.why-desc{font-size:13px;color:var(--gray-text);line-height:1.6}

/* ── ABOUT ──────────────────────────────────────────────────────────────── */
#about .about-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.about-img-wrap{position:relative}
.about-main-img{border-radius:20px;overflow:hidden;height:460px;background:var(--navy)}
.about-main-img img{width:100%;height:100%;object-fit:cover;object-position:top center}
.about-badge-card{position:absolute;bottom:-20px;right:-20px;background:#fff;border-radius:16px;padding:16px 20px;box-shadow:var(--shadow-lg);min-width:160px}
.abc-num{color:var(--gold);font-size:36px;font-weight:900;line-height:1}
.abc-lbl{color:var(--gray-text);font-size:12px;margin-top:2px}
.about-text .section-sub{max-width:100%;margin-bottom:24px}
.about-points{display:flex;flex-direction:column;gap:14px;margin-bottom:28px}
.ap{display:flex;align-items:flex-start;gap:12px;font-size:14px;color:#444;line-height:1.5}
.ap-check{width:22px;height:22px;border-radius:50%;background:var(--gold);display:flex;align-items:center;justify-content:center;color:var(--navy);font-size:11px;font-weight:900;flex-shrink:0;margin-top:1px}

/* ── SUBJECTS / COURSES ─────────────────────────────────────────────────── */
#subjects .sub-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:48px}
.sub-card{border-radius:var(--radius);overflow:hidden;border:1px solid #e8eef8;transition:all .2s}
.sub-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.sub-head{padding:32px 24px 24px;position:relative}
.sub-head-icon{font-size:40px;margin-bottom:14px}
.sub-head-name{color:#fff;font-size:26px;font-weight:900}
.sub-head-grade{color:rgba(255,255,255,.7);font-size:13px;margin-top:4px}
.sub-avail{position:absolute;top:20px;right:20px;background:rgba(255,255,255,.2);color:#fff;font-size:10px;font-weight:700;padding:4px 10px;border-radius:20px}
.sub-body{padding:20px 24px 24px;background:#fff}
.sub-feat{display:flex;align-items:flex-start;gap:10px;font-size:13px;color:#444;margin-bottom:10px;line-height:1.4}
.sub-check{width:20px;height:20px;border-radius:50%;background:#eef3ff;display:flex;align-items:center;justify-content:center;color:var(--navy);font-size:10px;font-weight:900;flex-shrink:0;margin-top:1px}
.sub-teacher{display:flex;align-items:center;gap:10px;margin-top:18px;padding-top:16px;border-top:1px solid #f0f0f0}
.sub-ava{width:38px;height:38px;border-radius:50%;overflow:hidden;flex-shrink:0;background:var(--navy);display:flex;align-items:center;justify-content:center;color:#fff;font-size:13px;font-weight:700}
.sub-ava img{width:100%;height:100%;object-fit:cover;object-position:top}
.sub-t-name{font-weight:700;font-size:13px;color:var(--navy)}
.sub-t-role{font-size:11px;color:var(--gray-text)}
.sub-cta{display:flex;align-items:center;justify-content:center;gap:6px;margin-top:16px;width:100%;padding:11px;border-radius:8px;font-weight:700;font-size:14px;border:none;transition:all .2s;cursor:pointer}
.sub-cta:hover{opacity:.85}

/* ── TEACHERS ───────────────────────────────────────────────────────────── */
#teachers{background:var(--gray-bg)}
.teachers-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:48px}
.teacher-card{background:#fff;border-radius:var(--radius);overflow:hidden;border:1px solid #e8eef8;transition:all .2s}
.teacher-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.teacher-photo{height:280px;overflow:hidden;background:var(--navy);position:relative}
.teacher-photo img{width:100%;height:100%;object-fit:cover;object-position:top center}
.teacher-photo-fallback{width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-size:56px;font-weight:900;color:#fff;position:absolute;inset:0}
.teacher-info{padding:20px}
.teacher-name{font-weight:800;font-size:17px;color:var(--navy)}
.teacher-role{color:var(--gray-text);font-size:13px;margin-top:3px}
.teacher-tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}
.teacher-quote{font-size:13px;color:#555;line-height:1.6;margin-top:12px;font-style:italic;border-left:3px solid var(--gold);padding-left:12px}

/* ── GALLERY ────────────────────────────────────────────────────────────── */
#gallery{background:#fff}
.gallery-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:auto auto;gap:12px;margin-top:40px}
.gallery-item{border-radius:var(--radius);overflow:hidden;position:relative;background:var(--navy)}
.gallery-item:first-child{grid-column:span 2;grid-row:span 2}
.gallery-item img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.gallery-item:hover img{transform:scale(1.04)}
.gallery-item-1{height:420px}
.gallery-item-sm{height:200px}
.gallery-caption{position:absolute;bottom:0;left:0;right:0;padding:16px;background:linear-gradient(transparent,rgba(7,26,69,.8));color:#fff;font-size:13px;font-weight:600;transform:translateY(100%);transition:.3s}
.gallery-item:hover .gallery-caption{transform:translateY(0)}

/* ── ACHIEVEMENTS ───────────────────────────────────────────────────────── */
#achieve{background:var(--navy);padding:72px 0}
.achieve-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.achieve-stats{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.a-stat{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:var(--radius);padding:20px;text-align:center}
.a-stat-num{color:var(--gold);font-size:40px;font-weight:900;line-height:1}
.a-stat-lbl{color:rgba(255,255,255,.65);font-size:12px;margin-top:6px;line-height:1.4}
.score-section{margin-top:20px}
.score-row{display:flex;align-items:center;gap:12px;margin-bottom:10px}
.score-lbl{color:#fff;font-size:13px;font-weight:600;min-width:60px}
.score-track{flex:1;background:rgba(255,255,255,.1);border-radius:4px;height:10px;overflow:hidden}
.score-fill{height:100%;border-radius:4px;background:var(--gold);transition:width .8s ease}
.score-cnt{color:rgba(255,255,255,.6);font-size:12px;min-width:60px;text-align:right}
.top-students{background:rgba(240,165,0,.08);border:1px solid rgba(240,165,0,.2);border-radius:var(--radius);padding:20px;margin-top:20px}
.ts-title{color:var(--gold);font-size:12px;font-weight:700;letter-spacing:1px;text-transform:uppercase;margin-bottom:14px}
.ts-row{display:flex;align-items:center;gap:12px;margin-bottom:8px}
.ts-rank{width:28px;height:28px;border-radius:50%;background:rgba(240,165,0,.2);display:flex;align-items:center;justify-content:center;font-size:13px;flex-shrink:0}
.ts-name{color:#fff;font-size:13px;font-weight:600;flex:1}
.ts-score{color:var(--gold);font-weight:900;font-size:15px}

/* ── PROCESS ────────────────────────────────────────────────────────────── */
#process{background:#fff}
.process-steps{display:grid;grid-template-columns:repeat(5,1fr);gap:0;margin-top:56px;position:relative}
.process-steps::before{content:'';position:absolute;top:36px;left:10%;right:10%;height:2px;background:#e0eaf8;z-index:0}
.p-step{text-align:center;position:relative;z-index:1;padding:0 8px}
.p-circle{width:72px;height:72px;border-radius:50%;margin:0 auto 16px;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:800;transition:all .3s;border:3px solid #e0eaf8;background:#fff;color:#aaa}
.p-step.done .p-circle{background:var(--gold);border-color:var(--gold);color:var(--navy)}
.p-step.active .p-circle{background:var(--navy);border-color:var(--navy);color:#fff;box-shadow:0 0 0 6px rgba(13,43,110,.1)}
.p-step-icon{font-size:26px;margin-bottom:4px}
.p-num{font-size:11px;font-weight:700}
.p-title{font-size:13px;font-weight:700;color:var(--navy);margin-bottom:6px}
.p-desc{font-size:12px;color:var(--gray-text);line-height:1.5}

/* ── TECH ───────────────────────────────────────────────────────────────── */
#tech{background:var(--gray-bg)}
.tech-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.tech-feats{display:flex;flex-direction:column;gap:20px}
.tech-feat{display:flex;gap:16px;align-items:flex-start}
.tf-icon{width:48px;height:48px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0}
.tf-title{font-size:15px;font-weight:700;color:var(--navy);margin-bottom:4px}
.tf-desc{font-size:13px;color:var(--gray-text);line-height:1.5}
.phone-mock{max-width:240px;margin:0 auto}
.pm-wrap{background:var(--navy-dark);border-radius:32px;padding:12px;box-shadow:var(--shadow-lg)}
.pm-screen{background:#fff;border-radius:22px;overflow:hidden}
.pm-bar{background:var(--navy);padding:12px 16px;display:flex;justify-content:space-between;align-items:center}
.pm-bar-title{color:#fff;font-size:11px;font-weight:700}
.pm-bar-time{color:rgba(255,255,255,.6);font-size:10px}
.pm-body{padding:14px;background:#f5f7fb}
.pm-msg{margin-bottom:10px}
.pm-bubble{background:#fff;border-radius:0 12px 12px 12px;padding:10px 12px;font-size:11px;color:#333;line-height:1.5;max-width:90%;box-shadow:0 1px 4px rgba(0,0,0,.06)}
.pm-bubble.ai{background:var(--navy);color:#fff;border-radius:12px 12px 12px 0;margin-left:auto;text-align:right}
.pm-ai-tag{display:inline-block;background:var(--gold);color:var(--navy);font-size:9px;font-weight:700;padding:1px 7px;border-radius:4px;margin-bottom:4px}
.pm-progress{background:#fff;border-radius:var(--radius);padding:12px;margin-top:10px;box-shadow:0 1px 4px rgba(0,0,0,.06)}
.pmp-title{font-size:10px;font-weight:700;color:var(--gray-text);margin-bottom:8px}
.pmp-bars{display:flex;gap:4px;align-items:flex-end;height:36px;margin-top:6px}
.pmp-bar{flex:1;background:var(--navy);border-radius:3px 3px 0 0;opacity:.2;transition:all .3s}
.pmp-bar.hi{opacity:1;background:var(--gold)}

/* ── TESTIMONIALS ───────────────────────────────────────────────────────── */
#testimonials{background:#fff}
.testi-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:48px}
.testi-card{background:var(--gray-bg);border-radius:var(--radius);padding:24px;border:1px solid #e8eef8}
.testi-stars{color:var(--gold);font-size:16px;margin-bottom:12px}
.testi-text{font-size:14px;color:#444;line-height:1.7;font-style:italic;margin-bottom:16px}
.testi-author{display:flex;align-items:center;gap:10px}
.testi-ava{width:36px;height:36px;border-radius:50%;background:var(--navy);display:flex;align-items:center;justify-content:center;color:#fff;font-size:13px;font-weight:700;flex-shrink:0}
.testi-name{font-weight:700;font-size:14px;color:var(--navy)}
.testi-role{font-size:11px;color:var(--gray-text)}

/* ── CTA / REGISTER ─────────────────────────────────────────────────────── */
#register{background:linear-gradient(135deg,var(--navy) 0%,var(--navy-light) 100%);padding:80px 0}
.reg-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.reg-left h2{color:#fff;font-size:clamp(24px,3.5vw,36px);font-weight:800;line-height:1.2;margin-bottom:12px}
.reg-left p{color:rgba(255,255,255,.75);font-size:15px;line-height:1.7;margin-bottom:24px}
.reg-benefits{display:flex;flex-direction:column;gap:10px}
.reg-b{display:flex;align-items:center;gap:10px;color:rgba(255,255,255,.85);font-size:14px}
.reg-b-icon{color:var(--gold);font-size:16px;flex-shrink:0}
.reg-form{background:#fff;border-radius:20px;padding:32px}
.reg-form h3{font-size:18px;font-weight:800;color:var(--navy);margin-bottom:4px}
.reg-form p{font-size:13px;color:var(--gray-text);margin-bottom:20px}
.form-group{margin-bottom:14px}
.form-label{display:block;font-size:13px;font-weight:600;color:#444;margin-bottom:5px}
.form-input,.form-select{width:100%;padding:11px 14px;border-radius:8px;border:1.5px solid #e0e8f0;font-size:14px;font-family:inherit;color:var(--text);outline:none;transition:border .2s;background:#fff}
.form-input:focus,.form-select:focus{border-color:var(--navy)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.form-submit{width:100%;padding:14px;background:var(--gold);color:var(--navy);border:none;border-radius:8px;font-size:15px;font-weight:800;cursor:pointer;transition:all .2s;margin-top:4px}
.form-submit:hover{background:#d49200}
.form-note{text-align:center;font-size:12px;color:var(--gray-text);margin-top:10px}

/* ── FOOTER ─────────────────────────────────────────────────────────────── */
#footer{background:var(--navy-dark);padding:56px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.08)}
.footer-brand{color:#fff;font-size:17px;font-weight:800;margin-bottom:4px}
.footer-brand-sub{color:var(--gold);font-size:12px;margin-bottom:14px;font-weight:600}
.footer-desc{font-size:13px;color:rgba(255,255,255,.55);line-height:1.7}
.footer-contact{margin-top:16px}
.fc-item{display:flex;align-items:center;gap:8px;font-size:13px;color:rgba(255,255,255,.6);margin-bottom:8px}
.footer-col-title{color:#fff;font-weight:700;font-size:13px;margin-bottom:14px}
.footer-link{display:block;color:rgba(255,255,255,.55);font-size:13px;margin-bottom:8px;transition:.2s}
.footer-link:hover{color:var(--gold)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding:20px 0}
.footer-copy{font-size:12px;color:rgba(255,255,255,.35)}
.footer-social{display:flex;gap:8px}
.soc-btn{width:34px;height:34px;border-radius:8px;background:rgba(255,255,255,.08);display:flex;align-items:center;justify-content:center;color:rgba(255,255,255,.6);font-size:13px;font-weight:700;transition:.2s;border:none;cursor:pointer}
.soc-btn:hover{background:var(--gold);color:var(--navy)}

/* ── FLOATING CTA ───────────────────────────────────────────────────────── */
.float-cta{position:fixed;bottom:24px;right:24px;z-index:900;display:flex;flex-direction:column;gap:10px}
.fcta-btn{display:flex;align-items:center;gap:8px;background:var(--gold);color:var(--navy);padding:10px 16px;border-radius:50px;font-size:13px;font-weight:700;border:none;cursor:pointer;box-shadow:0 4px 16px rgba(240,165,0,.4);transition:all .2s}
.fcta-btn:hover{transform:scale(1.05)}
.fcta-zalo{background:#0068ff;color:#fff;box-shadow:0 4px 16px rgba(0,104,255,.3)}

/* ── SKELETON LOADER ────────────────────────────────────────────────────── */
.skeleton{background:linear-gradient(90deg,#f0f0f0 25%,#e8e8e8 50%,#f0f0f0 75%);background-size:200% 100%;animation:skeleton-shimmer 1.4s infinite;border-radius:8px}
@keyframes skeleton-shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}
.sk-card{height:380px;border-radius:var(--radius)}
.sk-sub-card{height:320px;border-radius:var(--radius)}

/* ── SCROLL ANIMATIONS ──────────────────────────────────────────────────── */
.fade-up{opacity:0;transform:translateY(24px);transition:opacity .6s,transform .6s}
.fade-up.visible{opacity:1;transform:none}

/* ── RESPONSIVE ─────────────────────────────────────────────────────────── */
@media(max-width:1024px){
  .hero-content{grid-template-columns:1fr;text-align:center}
  .hero-card{display:none}
  .hero-btns{justify-content:center}
  .hero-stat{padding:0 12px}
  .about-grid{grid-template-columns:1fr!important;gap:32px}
  .about-badge-card{right:0;bottom:-10px}
  .gallery-grid{grid-template-columns:1fr 1fr}
  .gallery-item:first-child{grid-column:span 2;grid-row:auto}
  .reg-grid{grid-template-columns:1fr;gap:32px}
  .footer-grid{grid-template-columns:1fr 1fr}
}
/* Chuyển sang menu hamburger ở 900px chứ không phải 768px.
   Menu desktop cần tối thiểu ~824px (đo thực tế: 581px cho các link + 171px
   cho logo + padding). Để mốc ở 768px thì trong khoảng 769–824px menu vẫn
   hiện dạng desktop nhưng không đủ chỗ, các mục vỡ xuống hai dòng và navbar
   cao vọt lên. 900px cho khoảng dư an toàn; iPad ngang (1024px) vẫn giữ
   menu desktop vì thừa chỗ. */
@media(max-width:900px){
  .nav-links{display:none}
  .hamburger{display:flex}
}
@media(max-width:768px){
  .section{padding:52px 0}
  .why-grid{grid-template-columns:1fr 1fr}
  #subjects .sub-grid{grid-template-columns:1fr!important}
  .teachers-grid{grid-template-columns:1fr 1fr}
  .gallery-grid{grid-template-columns:1fr}
  .gallery-item:first-child{grid-column:auto}
  .achieve-grid{grid-template-columns:1fr}
  .process-steps{grid-template-columns:1fr 1fr;gap:20px}
  .process-steps::before{display:none}
  .tech-grid{grid-template-columns:1fr}
  .testi-grid{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero-stats{flex-wrap:wrap;gap:16px}
  .hero-stat{flex:1;min-width:120px;border:none;background:rgba(255,255,255,.05);border-radius:10px;padding:12px}
}
@media(max-width:480px){
  .why-grid{grid-template-columns:1fr}
  .achieve-stats{grid-template-columns:1fr 1fr}
  .teachers-grid{grid-template-columns:1fr}
}