/* ============================================================
   GRE PAGE — PREMIUM LAYOUT & ANIMATIONS
   Self-contained: includes header, footer, all sections
   ============================================================ */

/* === RESET & BASE === */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'Montserrat',sans-serif;color:#333;background:#fff;overflow-x:hidden;line-height:1.6;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit;transition:all .3s ease}
ul{list-style:none}
img{max-width:100%;height:auto;display:block}

/* === HEADER === */

.header.scrolled{background:rgba(255,255,255,.97);box-shadow:0 2px 20px rgba(0,0,0,.06)}

.lang-btn.active{background:#333;color:#fff}

.hamburger.active span:nth-child(1){transform:rotate(45deg) translate(6px,6px)}
.hamburger.active span:nth-child(2){opacity:0}
.hamburger.active span:nth-child(3){transform:rotate(-45deg) translate(6px,-6px)}

/* Side Buttons */
.side-buttons{position:fixed;right:0;top:50%;transform:translateY(-50%);z-index:900;display:flex;flex-direction:column;gap:2px}
.side-btn{display:block;padding:12px 20px;background:rgba(51,51,51,.88);color:#fff;font-size:.68rem;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;transition:all .3s ease}
.side-btn:hover{background:#242841;padding-right:28px}

/* Mobile Nav */

.mobile-nav.open{right:0}

/* ========================
   HERO
   ======================== */
.hero{position:relative;width:100%;height:65vh;min-height:450px;overflow:hidden}
.hero-bg{position:absolute;inset:0}
.hero-img{width:100%;height:100%;object-fit:cover;transition:transform 8s ease}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(to right,rgba(0,0,0,.55) 0%,rgba(0,0,0,.25) 50%,rgba(0,0,0,.1) 100%)}
.hero-content{position:absolute;bottom:80px;left:60px;z-index:2;max-width:550px}
.hero-title{font-size:3.2rem;font-weight:900;color:#fff;letter-spacing:4px;margin-bottom:12px;line-height:1.1;opacity:0;transform:translateY(30px);animation:heroFadeIn .8s .3s forwards}
.hero-accent-line{width:80px;height:4px;background:#242841;margin-bottom:20px;opacity:0;transform:scaleX(0);transform-origin:left;animation:lineGrow .6s .6s forwards}
.hero-text{font-size:.88rem;color:rgba(255,255,255,.85);line-height:1.7;margin-bottom:8px;opacity:0;transform:translateY(20px);animation:heroFadeIn .8s .9s forwards}
.hero-breadcrumb{position:absolute;bottom:20px;left:60px;z-index:2;font-size:.7rem;color:rgba(255,255,255,.45);letter-spacing:.5px}
.hero-breadcrumb a{color:rgba(255,255,255,.45)}
.hero-breadcrumb a:hover{color:#fff}
@keyframes heroFadeIn{to{opacity:1;transform:translateY(0)}}
@keyframes lineGrow{to{opacity:1;transform:scaleX(1)}}

/* ========================
   INTRO
   ======================== */
.intro-section{padding:40px 40px 30px;background:#fff}
.intro-inner{max-width:1200px;margin:0 auto}
.intro-inner p{font-size:.88rem;color:#444;line-height:1.8;font-style:italic}

/* ========================
   TABS
   ======================== */
.tabs-section{padding:0 0 60px;background:#fff}
.tabs-container{max-width:1200px;margin:0 auto;padding:20px 40px 0}
.tabs-nav{display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin-bottom:40px}
.tab-btn{padding:24px 20px;background:#f0f0f0;border:none;border-top:4px solid #ddd;font-family:'Montserrat',sans-serif;font-size:.78rem;font-weight:700;letter-spacing:.5px;color:#555;text-align:left;cursor:pointer;transition:all .3s ease;line-height:1.4;text-transform:uppercase}
.tab-btn:hover{background:#f8f8f8;color:#333}
.tab-btn.active{background:#fff;border-top-color:#242841;color:#333}

.tab-panel{display:none;opacity:0;transform:translateY(10px);transition:opacity .4s ease,transform .4s ease}
.tab-panel.active{display:block;opacity:1;transform:translateY(0);animation:tabFadeIn .4s ease}
@keyframes tabFadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
.tab-panel p{font-size:.88rem;color:#444;line-height:1.8;margin-bottom:14px}

/* ========================
   FEATURES GRID (Tab 1)
   ======================== */
.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:28px}
.feature-card{text-align:center;padding:28px 16px;background:linear-gradient(145deg, #ffffff, #f4f6f9);border-radius:16px;border:1px solid rgba(36,40,65,.05);border-top:4px solid #242841;transition:all .4s cubic-bezier(0.175, 0.885, 0.32, 1.275);position:relative;overflow:hidden}
.feature-card::before{content:'';position:absolute;top:0;left:0;width:100%;height:100%;background:radial-gradient(circle at top right, rgba(36,40,65,0.03), transparent);pointer-events:none}
.feature-card:hover{transform:translateY(-8px);box-shadow:0 15px 35px rgba(36,40,65,.12);border-color:rgba(36,40,65,0.1)}
.feature-icon{display:inline-flex;align-items:center;justify-content:center;width:64px;height:64px;background:rgba(36,40,65,.05);border-radius:16px;margin-bottom:20px;color:#242841;transition:all .4s ease;border:1px solid rgba(36,40,65,0.1)}
.feature-icon svg{width:30px;height:30px;stroke-width:1.8;filter:drop-shadow(0 2px 4px rgba(36,40,65,.15))}
.feature-card:hover .feature-icon{background:#242841;color:#fff;transform:rotate(-8deg) scale(1.15);box-shadow:0 8px 20px rgba(36,40,65,0.3);border-color:#242841}
.feature-card:hover .feature-icon svg{filter:drop-shadow(0 0 10px rgba(255,255,255,0.8));animation:iconPulse 2s infinite ease-in-out}
@keyframes iconPulse{0%,100%{transform:scale(1)}50%{transform:scale(1.1)}}
.feature-card h4{font-size:.78rem;font-weight:700;color:#222;letter-spacing:.5px;margin-bottom:6px;text-transform:uppercase}
.feature-card p{font-size:.72rem;color:#888;line-height:1.5;margin:0}

/* ========================
   FORMAT CARDS (Tab 2)
   ======================== */
.format-cards{display:flex;flex-direction:column;gap:16px;margin-top:24px}
.format-card{border-radius:8px;overflow:hidden;border:1px solid #eee;transition:all .3s ease}
.format-card:hover{box-shadow:0 12px 30px rgba(36,40,65,.1);transform:translateX(5px);border-color:rgba(36,40,65,0.15)}
.format-header{display:flex;align-items:center;gap:14px;padding:18px 24px;background:rgba(36,40,65,0.02);border-bottom:1px solid #eee}
.format-icon{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;background:rgba(36,40,65,.05);border-radius:10px;color:#242841;transition:all .3s ease}
.format-icon svg{width:22px;height:22px;stroke-width:1.8}
.format-card:hover .format-icon{background:#242841;color:#fff;transform:scale(1.1) rotate(-5deg)}
.format-header h3{font-size:.88rem;font-weight:700;color:#222;letter-spacing:.3px;margin-bottom:2px}
.format-badge{display:inline-block;padding:4px 14px;background:#242841;color:#fff;font-size:.65rem;font-weight:700;letter-spacing:.8px;border-radius:20px}
.format-body{padding:20px 24px}
.format-body p{font-size:.86rem;color:#444;line-height:1.8;margin-bottom:12px}
.format-list{padding-left:0;margin:12px 0 0}
.format-list li{font-size:.84rem;color:#444;line-height:1.7;padding:8px 0 8px 20px;position:relative;border-bottom:1px solid rgba(0,0,0,.04)}
.format-list li::before{content:'';position:absolute;left:0;top:16px;width:6px;height:6px;border-radius:50%;background:#242841}
.format-list li strong{color:#222}

/* ========================
   SCORE VISUALIZATION (Tab 3)
   ======================== */
.score-visual{margin:32px 0 10px}
.score-visual h4{font-size:.92rem;font-weight:700;color:#222;margin-bottom:20px;letter-spacing:.5px;text-transform:uppercase}

.gre-table-container{width:100%;overflow-x:auto;padding-bottom:10px;margin-top:20px}
.gre-table{width:100%;border-collapse:collapse;min-width:700px;text-align:left;background:#fff}
.gre-table th, .gre-table td{padding:14px 20px;border-bottom:1px solid #242841;font-size:.85rem;color:#666}
.gre-table thead tr:first-child th{font-size:.95rem;font-weight:400;color:#888;text-transform:none;letter-spacing:0;border-bottom:2px solid #242841}
.th-verbal, .th-analytical{background:transparent}
.th-quant, .th-quant-col, .td-quant{background-color:#f2f2f2}
.gre-table .sub-header th{font-weight:400;color:#888;font-size:.8rem}
.gre-table tbody tr:last-child td{border-bottom:1px solid #242841}

/* ========================
   RELATED COURSES
   ======================== */
.related-section{padding:60px 0 80px;background:#fafafa;border-top:1px solid #e8e8e8}
.related-container{max-width:1200px;margin:0 auto;padding:0 40px}
.related-heading{font-size:1.8rem;font-weight:300;color:#ccc;letter-spacing:8px;margin-bottom:24px;padding-bottom:16px;border-bottom:1px solid #e8e8e8}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:30px}
.related-card{position:relative;height:260px;overflow:hidden;display:block;cursor:pointer}
.related-img{width:100%;height:100%;object-fit:cover;transition:transform .6s ease;filter:brightness(.8)}
.related-card:hover .related-img{transform:scale(1.06)}
.related-overlay{position:absolute;inset:0;background:linear-gradient(to top,rgba(0,0,0,.65) 0%,rgba(0,0,0,.15) 100%)}
.related-info{position:absolute;bottom:24px;left:24px;z-index:2}
.related-line{width:60px;height:4px;background:#242841;margin-bottom:10px}
.related-info h3{font-size:.82rem;font-weight:800;color:#fff;letter-spacing:1.5px;line-height:1.5;text-transform:uppercase}
.show-more{display:inline-block;padding:12px 28px;border:2px solid #ddd;font-size:.72rem;font-weight:700;letter-spacing:2px;color:#888;transition:all .3s ease}
.show-more:hover{border-color:#242841;color:#242841}

/* ========================
   FOOTER
   ======================== */
.footer{background:#fff;border-top:1px solid #e8e8e8;padding:50px 0 30px}
.footer-inner{max-width:1200px;margin:0 auto;padding:0 40px;display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:40px}
.footer-brand 
.footer-social{display:flex;gap:10px}
.social-icon{width:36px;height:36px;border-radius:50%;border:1.5px solid #ddd;display:flex;align-items:center;justify-content:center;color:#888;transition:all .3s ease}
.social-icon svg{width:16px;height:16px}
.social-icon:hover{background:#242841;border-color:#242841;color:#fff}
.footer-title{font-size:.72rem;font-weight:700;letter-spacing:2px;color:#333;margin-bottom:12px;padding-bottom:8px;border-bottom:3px solid #242841;display:inline-block}
.footer-col ul{padding:0}
.footer-col li{margin-bottom:6px;font-size:.75rem;color:#888;letter-spacing:.3px}
.footer-col a{color:#888}
.footer-col a:hover{color:#242841}

/* ========================
   RESPONSIVE
   ======================== */
@media(max-width:768px){
    
    .side-buttons{display:none}
    .hero{height:50vh;min-height:320px}
    .hero-content{left:20px;bottom:60px;max-width:90%}
    .hero-title{font-size:2rem}
    .hero-breadcrumb{left:20px}
    .intro-section{padding:30px 20px 20px}
    .tabs-container{padding:20px 20px 0}
    .tabs-nav{grid-template-columns:1fr}
    .features-grid{grid-template-columns:repeat(2,1fr)}
    .related-container{padding:0 20px}
    .related-grid{grid-template-columns:1fr}
    .footer-inner{grid-template-columns:1fr;gap:24px}
}
@media(max-width:480px){
    .hero-title{font-size:1.6rem;letter-spacing:2px}
    .features-grid{grid-template-columns:1fr 1fr}
    .related-card{height:200px}
}