/* Design system variables (dark theme) */
:root{
  --background: #051029; /* deep midnight */
  --surface: rgba(10,18,34,0.7);
  --surface-2: rgba(7,14,28,0.5);
  --surface-strong: #0b1220;
  --primary: #0b6cff; /* saturated blue */
  --primary-2: #00d4ff; /* cyan accent */
  --accent-glow: rgba(11,108,255,0.25);
  --muted: #9aa6b2;
  --text: #e6eef8;
  --text-strong: #ffffff;
  --border: rgba(255,255,255,0.06);
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 8px 30px rgba(2,6,23,0.6);
  --glass-blur: 10px;
}

/* Base */
*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:Inter,system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial;color:var(--text);background:linear-gradient(180deg,var(--background),#031026);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
.container{max-width:1200px;margin:0 auto;padding:24px}

a{color:inherit;text-decoration:none}
.muted{color:var(--muted)}

/* Header */
.site-header{position:sticky;top:0;z-index:60;backdrop-filter:blur(var(--glass-blur));background:linear-gradient(180deg,rgba(2,8,20,0.35),rgba(2,6,20,0.5));border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 24px}
.brand{display:flex;align-items:center;gap:12px}
.brand-logo{width:48px;height:48px;border-radius:12px;box-shadow:0 6px 20px rgba(3,12,40,0.6);background:linear-gradient(135deg,var(--surface-2),transparent);padding:6px}
.brand-words{display:flex;flex-direction:column}
.brand-title{font-weight:700;color:var(--text-strong);letter-spacing:0.2px}
.brand-sub{font-size:12px;color:var(--muted)}

.main-nav{display:block}
.nav-list{display:flex;gap:20px;list-style:none;margin:0;padding:0}
.nav-link{color:var(--muted);padding:8px 10px;border-radius:10px;transition:all .18s ease}
.nav-link:hover,.nav-link:focus{color:var(--text-strong);background:linear-gradient(90deg,rgba(11,108,255,0.06),rgba(0,212,255,0.03));box-shadow:inset 0 -2px 0 rgba(11,108,255,0.04)}

.header-actions{display:flex;align-items:center;gap:12px}
.btn{padding:8px 12px;border-radius:12px;border:1px solid transparent;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;gap:8px}
.btn-ghost{background:transparent;border:1px solid rgba(255,255,255,0.04);color:var(--text)}
.btn-primary{background:linear-gradient(90deg,var(--primary),var(--primary-2));color:#01203b;padding:10px 16px;border-radius:14px;box-shadow:0 6px 24px var(--accent-glow);border:none}
.btn-secondary{background:transparent;border:1px solid rgba(255,255,255,0.06);color:var(--text);padding:9px 14px;border-radius:12px}

.menu-btn{display:none;background:transparent;border:0;color:var(--text);font-size:18px}

/* Mobile nav */
.mobile-nav{position:fixed;inset:0;background:linear-gradient(180deg,rgba(2,6,20,0.96),rgba(2,6,20,0.98));transform:translateX(100%);transition:transform .28s cubic-bezier(.2,.9,.2,1);z-index:80;padding:20px}
.mobile-nav.open{transform:translateX(0)}
.mobile-nav-list{list-style:none;padding:24px 0;margin:0;display:flex;flex-direction:column;gap:12px}
.mobile-link{color:var(--text);font-size:18px}
.mobile-close{position:absolute;right:18px;top:18px;background:transparent;border:0;color:var(--muted);font-size:22px}

/* HERO */
.hero{position:relative;min-height:64vh;display:flex;align-items:center;color:var(--text);overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0;padding:0}
.hero-glow{position:absolute;right:-20%;top:-10%;width:60%;height:60%;background:radial-gradient(circle at 20% 20%, rgba(11,108,255,0.16), transparent 20%), radial-gradient(circle at 80% 80%, rgba(0,212,255,0.08), transparent 30%);filter:blur(40px);transform:translateZ(0)}
.hero-inner{position:relative;z-index:2;display:grid;grid-template-columns:1fr 420px;gap:28px;align-items:center;padding:64px 24px}
.hero-left{max-width:700px}
.hero-title{font-size:44px;line-height:1.02;margin:6px 0 12px;font-weight:800;color:var(--text-strong)}
.hero-lead{font-size:16px;color:var(--muted);margin-bottom:18px}
.hero-ctas{display:flex;gap:12px}
.hero-stats{display:flex;gap:18px;margin-top:20px;list-style:none;padding:0}
.hero-stats li{display:flex;flex-direction:column;align-items:flex-start;gap:6px}
.hero-stats strong{font-size:18px;color:var(--text-strong)}

.hero-right{display:flex;justify-content:center}
.hero-card{background:linear-gradient(180deg,rgba(255,255,255,0.03),rgba(255,255,255,0.02));backdrop-filter:blur(var(--glass-blur));border-radius:18px;padding:18px;width:100%;border:1px solid var(--border);box-shadow:var(--shadow)}
.card-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.current-lesson-badge{background:linear-gradient(90deg,var(--primary),var(--primary-2));color:#01203b;padding:6px 10px;border-radius:999px;font-weight:700}
.schedule-preview-list{display:flex;flex-direction:column;gap:8px}
.preview-item{display:flex;justify-content:space-between;align-items:center;padding:10px;border-radius:12px;background:rgba(255,255,255,0.01);border:1px solid rgba(255,255,255,0.03)}
.preview-item .time{color:var(--muted);font-size:13px}
.preview-item .meta{display:flex;flex-direction:column}

/* Sections */
.section{padding:36px 0}
.section-head{display:flex;justify-content:space-between;align-items:start;gap:12px;margin-bottom:18px}
.section-head h2{font-size:22px;margin:0}
.controls-row{display:flex;gap:12px;align-items:center}
.tabs{display:flex;gap:8px}
.tab{background:transparent;border:1px solid rgba(255,255,255,0.03);padding:8px 12px;border-radius:10px;color:var(--muted);cursor:pointer}
.tab.active{background:linear-gradient(90deg,rgba(11,108,255,0.08),rgba(0,212,255,0.04));color:var(--text-strong);border-color:var(--border)}

.schedule-body{display:flex;flex-direction:column}
.schedule-grid{display:grid;grid-template-columns:1fr 320px;gap:20px}
.schedule-column{min-width:0}
.schedule-list{display:flex;flex-direction:column;gap:12px}
.schedule-item{display:flex;justify-content:space-between;align-items:center;padding:14px;border-radius:14px;background:linear-gradient(180deg,rgba(255,255,255,0.01),transparent);border:1px solid var(--border);transition:transform .18s ease,box-shadow .18s ease}
.schedule-item:hover{transform:translateY(-6px);box-shadow:0 10px 30px rgba(2,6,23,0.6)}
.schedule-item.active{border-left:4px solid var(--primary);background:linear-gradient(90deg,rgba(11,108,255,0.06),transparent)}
.lesson-number{font-weight:700;color:var(--muted);margin-right:8px}
.lesson-info{display:flex;flex-direction:column;gap:4px}
.lesson-time{font-size:13px;color:var(--muted)}
.lesson-subject{font-weight:700;color:var(--text-strong)}

/* Aside */
.schedule-aside{display:flex;flex-direction:column;gap:12px}
.card{background:linear-gradient(180deg,rgba(255,255,255,0.02),transparent);padding:12px;border-radius:12px;border:1px solid var(--border)}
.stats-grid{display:flex;gap:12px}
.stat{display:flex;flex-direction:column}
.stat-value{font-weight:800;color:var(--text-strong)}
.stat-label{color:var(--muted);font-size:13px}

/* Teachers */
.cards-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
.teacher-card{padding:14px;border-radius:16px;background:linear-gradient(180deg,rgba(255,255,255,0.02),transparent);border:1px solid var(--border);transition:transform .18s ease,box-shadow .18s ease}
.teacher-card:hover{transform:translateY(-6px);box-shadow:0 10px 30px rgba(2,6,23,0.65)}
.teacher-card .teacher-card-name{font-weight:700;color:var(--text-strong)}
.teacher-card .teacher-card-info{color:var(--muted);font-size:13px;margin-top:6px}

/* Subjects */
.subjects-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px}
.subject-card{padding:12px;border-radius:12px;background:linear-gradient(180deg,rgba(255,255,255,0.01),transparent);border:1px solid var(--border);display:flex;gap:10px;align-items:center}
.subject-icon{width:36px;height:36px;border-radius:8px;background:linear-gradient(90deg,var(--primary),var(--primary-2));display:inline-flex;align-items:center;justify-content:center;color:#021424}

/* Footer */
.site-footer{padding:28px 0;border-top:1px solid rgba(255,255,255,0.02);margin-top:36px}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:12px}
.footer-logo{width:36px;height:36px;border-radius:8px}
.footer-copy{color:var(--muted)}
.footer-nav a{color:var(--muted);margin-left:12px}

/* Modal placeholder */
.modal{display:none}

/* Responsive */
@media (max-width:1024px){
  .hero-inner{grid-template-columns:1fr 360px}
  .schedule-grid{grid-template-columns:1fr 300px}
}
@media (max-width:820px){
  .nav-list{display:none}
  .menu-btn{display:inline-block}
  .hero-inner{grid-template-columns:1fr}
  .hero-right{order:2}
  .schedule-grid{grid-template-columns:1fr}
  .header-inner{padding:12px}
}

/* Accessibility: reduced motion */
.reduced-motion *{transition:none!important;animation:none!important}

/* Prevent horizontal overflow */
html,body{overflow-x:hidden}