/* ============================================
   MyTeacher — Greek Tutoring Platform
   Design System: Modern EdTech (Indigo/Teal)
   ============================================ */

:root{
  --bg:#0F0F1A;
  --bg2:#161628;
  --bg3:#1E1E36;
  --card:rgba(255,255,255,.04);
  --card-hover:rgba(255,255,255,.07);
  --brd:rgba(255,255,255,.08);
  --text:#E8E8F0;
  --text-muted:#8888A8;
  --accent:#6366F1;
  --accent2:#14B8A6;
  --accent3:#F59E0B;
  --accent-glow:rgba(99,102,241,.35);
  --teal-glow:rgba(20,184,166,.3);
  --grad:linear-gradient(135deg,#6366F1 0%,#14B8A6 100%);
  --grad-warm:linear-gradient(135deg,#F59E0B 0%,#EF4444 100%);
  --radius:16px;
  --radius-lg:24px;
  --radius-sm:10px;
  --sans:'Inter',system-ui,-apple-system,sans-serif;
  --display:'Space Grotesk',var(--sans);
  --shadow:0 4px 24px rgba(0,0,0,.3);
  --shadow-lg:0 12px 48px rgba(0,0,0,.4);
  --shadow-glow:0 0 40px var(--accent-glow);
  --transition:.3s cubic-bezier(.4,0,.2,1);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--sans);background:var(--bg);color:var(--text);line-height:1.6;overflow-x:hidden}

::selection{background:var(--accent);color:#fff}

/* Scrollbar */
::-webkit-scrollbar{width:8px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:var(--accent);border-radius:4px}

/* ==================== TYPOGRAPHY ==================== */
h1,h2,h3,h4{font-family:var(--display);font-weight:700;line-height:1.15;letter-spacing:-.02em}
h1{font-size:clamp(2.2rem,5vw,4rem)}
h2{font-size:clamp(1.8rem,4vw,2.8rem)}
h3{font-size:1.3rem}
p{color:var(--text-muted);font-size:1.05rem}
a{color:inherit;text-decoration:none}

.sec-tag{display:inline-flex;align-items:center;gap:.5rem;padding:.4rem 1rem;background:rgba(99,102,241,.12);border:1px solid rgba(99,102,241,.25);border-radius:50px;font-size:.75rem;font-weight:600;color:var(--accent);text-transform:uppercase;letter-spacing:.08em;margin-bottom:1rem}
.sec-h span,.sec-h em{color:var(--accent2);font-style:italic;font-family:var(--display)}

/* ==================== LAYOUT ==================== */
.wrap{max-width:1200px;margin:0 auto;padding:0 1.5rem}
section{padding:6rem 0;position:relative}
.grid{display:grid;gap:2rem}

/* ==================== BUTTONS ==================== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.85rem 1.8rem;border-radius:50px;font-weight:600;font-size:.9rem;cursor:pointer;border:none;transition:var(--transition);text-decoration:none;font-family:var(--sans)}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 4px 20px var(--accent-glow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px var(--accent-glow)}
.btn-outline{background:transparent;color:var(--text);border:1.5px solid var(--brd)}
.btn-outline:hover{border-color:var(--accent);background:rgba(99,102,241,.08)}
.btn-ghost{background:rgba(255,255,255,.05);color:var(--text);border:1px solid var(--brd)}
.btn-ghost:hover{background:rgba(255,255,255,.1)}
.btn-lg{padding:1.1rem 2.5rem;font-size:1rem}
.btn-sm{padding:.5rem 1.2rem;font-size:.8rem}

/* ==================== HEADER ==================== */
header{position:fixed;top:0;left:0;right:0;z-index:400;background:rgba(15,15,26,.85);backdrop-filter:blur(20px);border-bottom:1px solid var(--brd);transition:var(--transition)}
header.scrolled{background:rgba(15,15,26,.98);box-shadow:0 4px 20px rgba(0,0,0,.3)}

.nav{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.5rem;max-width:1200px;margin:0 auto}

.logo{display:flex;align-items:center;gap:.6rem;font-family:var(--display);font-weight:700;font-size:1.2rem;color:var(--text)}
.logo-icon{width:36px;height:36px;background:var(--grad);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.1rem;color:#fff}

.nav-links{display:flex;align-items:center;gap:2rem;list-style:none}
.nav-links a{color:var(--text-muted);font-size:.88rem;font-weight:500;transition:var(--transition);position:relative}
.nav-links a:hover{color:var(--text)}
.nav-links a::after{content:'';position:absolute;bottom:-4px;left:0;width:0;height:2px;background:var(--accent);transition:var(--transition)}
.nav-links a:hover::after{width:100%}

.nav-actions{display:flex;align-items:center;gap:.8rem}
.lang-switch{background:rgba(255,255,255,.05);border:1px solid var(--brd);color:var(--text);padding:.5rem 1rem;border-radius:50px;font-size:.8rem;cursor:pointer;font-family:var(--sans);transition:var(--transition)}
.lang-switch:hover{border-color:var(--accent);background:rgba(99,102,241,.1)}

.menu-toggle{display:none;background:none;border:none;font-size:1.3rem;cursor:pointer;color:var(--text);padding:.3rem;position:relative;z-index:420}

.mobile-lang{display:none}

/* ==================== HERO ==================== */
.hero{padding:10rem 0 5rem;position:relative;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0;opacity:.4}
.hero-bg::before{content:'';position:absolute;top:-20%;left:-10%;width:500px;height:500px;background:var(--accent-glow);border-radius:50%;filter:blur(120px)}
.hero-bg::after{content:'';position:absolute;bottom:-20%;right:-10%;width:400px;height:400px;background:var(--teal-glow);border-radius:50%;filter:blur(100px)}

.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:4rem;align-items:center;position:relative;z-index:1}

.hero-badge{display:inline-flex;align-items:center;gap:.5rem;padding:.5rem 1.2rem;background:rgba(99,102,241,.12);border:1px solid rgba(99,102,241,.3);border-radius:50px;font-size:.78rem;font-weight:600;color:var(--accent);margin-bottom:1.5rem}
.hero-badge i{font-size:.7rem}

.hero h1{margin-bottom:1.5rem}
.hero h1 span{background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}

.hero p{font-size:1.15rem;margin-bottom:2rem;max-width:560px;line-height:1.7}

.hero-cta{display:flex;gap:1rem;margin-bottom:2.5rem;flex-wrap:wrap}
.hero-cta .btn{flex-shrink:0}

.hero-stats{display:flex;gap:2.5rem;flex-wrap:wrap}
.hero-stat{display:flex;flex-direction:column}
.hero-stat .num{font-family:var(--display);font-size:2.2rem;font-weight:700;color:var(--text)}
.hero-stat .lbl{font-size:.78rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em}

/* Hero Visual */
.hero-visual{position:relative}
.hero-card{background:var(--card);border:1px solid var(--brd);border-radius:var(--radius-lg);padding:1.5rem;box-shadow:var(--shadow-lg);backdrop-filter:blur(10px)}
.hero-card-head{display:flex;align-items:center;gap:.8rem;margin-bottom:1.2rem}
.hero-card-avatar{width:48px;height:48px;border-radius:50%;background:var(--grad);display:flex;align-items:center;justify-content:center;font-size:1.2rem;color:#fff;overflow:hidden;flex-shrink:0}
.hero-card-avatar img{width:100%;height:100%;object-fit:cover;border-radius:50%}
.hero-card-name{font-weight:600;font-size:.95rem}
.hero-card-sub{font-size:.78rem;color:var(--text-muted)}
.hero-card-body{padding:1rem 0;border-top:1px solid var(--brd)}
.hero-card-row{display:flex;justify-content:space-between;align-items:center;padding:.5rem 0;font-size:.85rem}
.hero-card-row span:first-child{color:var(--text-muted)}
.hero-card-row span:last-child{font-weight:600}
.hero-card-badge{display:inline-flex;align-items:center;gap:.3rem;padding:.3rem .8rem;background:rgba(20,184,166,.15);border:1px solid rgba(20,184,166,.3);border-radius:50px;font-size:.7rem;color:var(--accent2);margin-top:.8rem}

/* Floating badges */
.hero-float{position:absolute;background:var(--bg2);border:1px solid var(--brd);border-radius:12px;padding:.6rem 1rem;font-size:.75rem;font-weight:600;box-shadow:var(--shadow);display:flex;align-items:center;gap:.4rem}
.hero-float i{color:var(--accent2)}
.hero-float-1{top:-15px;right:10%;animation:float 4s ease-in-out infinite}
.hero-float-2{bottom:20px;left:-20px;animation:float 4s ease-in-out infinite 2s}

@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}

/* ==================== TRUST BAR ==================== */
.trust{padding:3rem 0;border-top:1px solid var(--brd);border-bottom:1px solid var(--brd)}
.trust-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:2rem;text-align:center}
.trust-item{display:flex;flex-direction:column;align-items:center;gap:.5rem}
.trust-num{font-family:var(--display);font-size:2.5rem;font-weight:700;background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.trust-lbl{font-size:.82rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em}

/* ==================== FEATURES ==================== */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:2rem;margin-top:3rem}
.feature-card{background:var(--card);border:1px solid var(--brd);border-radius:var(--radius);padding:2rem;transition:var(--transition);position:relative;overflow:hidden}
.feature-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--grad);transform:scaleX(0);transform-origin:left;transition:var(--transition)}
.feature-card:hover{background:var(--card-hover);transform:translateY(-4px);border-color:rgba(99,102,241,.3)}
.feature-card:hover::before{transform:scaleX(1)}
.feature-icon{width:52px;height:52px;border-radius:14px;background:rgba(99,102,241,.12);display:flex;align-items:center;justify-content:center;font-size:1.3rem;color:var(--accent);margin-bottom:1.2rem}
.feature-card h3{margin-bottom:.6rem}
.feature-card p{font-size:.92rem;line-height:1.6}

/* ==================== HOW IT WORKS ==================== */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:2rem;margin-top:3rem;counter-reset:step}
.step-card{background:var(--card);border:1px solid var(--brd);border-radius:var(--radius);padding:2.5rem 2rem;position:relative;transition:var(--transition)}
.step-card:hover{border-color:var(--accent);background:var(--card-hover)}
.step-num{counter-increment:step;width:48px;height:48px;border-radius:50%;background:var(--grad);display:flex;align-items:center;justify-content:center;font-family:var(--display);font-size:1.3rem;font-weight:700;color:#fff;margin-bottom:1.2rem}
.step-num::before{content:counter(step)}
.step-card h3{margin-bottom:.6rem}
.step-card p{font-size:.92rem}

/* ==================== SUBJECTS ==================== */
.subjects-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:1rem;margin-top:3rem}
.subject-chip{background:var(--card);border:1px solid var(--brd);border-radius:var(--radius-sm);padding:1.2rem 1rem;text-align:center;transition:var(--transition);cursor:pointer}
.subject-chip:hover{background:rgba(99,102,241,.1);border-color:var(--accent);transform:translateY(-2px)}
.subject-chip i{font-size:1.8rem;color:var(--accent);margin-bottom:.6rem;display:block}
.subject-chip span{font-size:.85rem;font-weight:600;display:block}
.subject-chip small{font-size:.7rem;color:var(--text-muted)}

/* ==================== TUTORS SHOWCASE ==================== */
.tutors-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.5rem;margin-top:3rem}
.tutor-card{background:var(--card);border:1px solid var(--brd);border-radius:var(--radius);overflow:hidden;transition:var(--transition)}
.tutor-card:hover{transform:translateY(-4px);border-color:var(--accent);box-shadow:var(--shadow-lg)}
.tutor-img{width:100%;aspect-ratio:1;object-fit:cover;background:var(--bg3)}
.tutor-body{padding:1.2rem}
.tutor-name{font-weight:700;font-size:.95rem;margin-bottom:.2rem}
.tutor-sub{font-size:.78rem;color:var(--accent2);margin-bottom:.6rem}
.tutor-meta{display:flex;justify-content:space-between;align-items:center;font-size:.78rem;color:var(--text-muted)}
.tutor-rating{display:flex;align-items:center;gap:.3rem;color:#F59E0B}
.tutor-price{font-weight:700;color:var(--text)}

/* ==================== PRICING ==================== */
.pricing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem;margin-top:3rem;align-items:stretch}
.price-card{background:var(--card);border:1px solid var(--brd);border-radius:var(--radius-lg);padding:2.5rem 2rem;display:flex;flex-direction:column;transition:var(--transition);position:relative}
.price-card:hover{border-color:var(--accent);transform:translateY(-4px)}
.price-card.featured{border-color:var(--accent);background:rgba(99,102,241,.06);box-shadow:var(--shadow-glow)}
.price-badge{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--grad);color:#fff;padding:.3rem 1.2rem;border-radius:50px;font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em}
.price-card h3{font-size:1.4rem;margin-bottom:.3rem}
.price-sub{font-size:.85rem;color:var(--text-muted);margin-bottom:1.5rem}
.price-amount{font-family:var(--display);font-size:3rem;font-weight:700;color:var(--text);margin-bottom:.3rem}
.price-amount .currency{font-size:1.2rem;vertical-align:top;margin-right:.2rem;color:var(--accent)}
.price-amount .period{font-size:.9rem;color:var(--text-muted);font-weight:400}
.price-features{list-style:none;margin:1.5rem 0;flex:1}
.price-features li{display:flex;align-items:flex-start;gap:.6rem;padding:.5rem 0;font-size:.88rem}
.price-features li i{color:var(--accent2);margin-top:.2rem;flex-shrink:0}
.price-features li.muted{color:var(--text-muted)}
.price-features li.muted i{color:var(--text-muted)}
.price-btn{width:100%;margin-top:auto}

/* ==================== TESTIMONIALS ==================== */
.testi-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem;margin-top:3rem}
.testi-card{background:var(--card);border:1px solid var(--brd);border-radius:var(--radius);padding:2rem;transition:var(--transition)}
.testi-card:hover{background:var(--card-hover);border-color:var(--brd)}
.testi-stars{color:#F59E0B;margin-bottom:1rem;font-size:.9rem;letter-spacing:.1rem}
.testi-text{font-size:.92rem;line-height:1.7;color:var(--text);margin-bottom:1.2rem;font-style:italic}
.testi-author{display:flex;align-items:center;gap:.8rem}
.testi-avatar{width:40px;height:40px;border-radius:50%;background:var(--grad);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:.85rem;flex-shrink:0}
.testi-name{font-weight:600;font-size:.85rem}
.testi-role{font-size:.75rem;color:var(--text-muted)}

/* ==================== FAQ ==================== */
.faq-list{max-width:760px;margin:3rem auto 0;display:flex;flex-direction:column;gap:.8rem}
.faq-item{background:var(--card);border:1px solid var(--brd);border-radius:var(--radius-sm);overflow:hidden;transition:var(--transition)}
.faq-item.open{border-color:var(--accent)}
.faq-q{padding:1.2rem 1.5rem;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:.92rem;color:var(--text);user-select:none}
.faq-q i{color:var(--accent);transition:var(--transition)}
.faq-item.open .faq-q i{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-item.open .faq-a{max-height:300px}
.faq-a p{padding:0 1.5rem 1.2rem;font-size:.88rem;line-height:1.6}

/* ==================== CTA SECTION ==================== */
.cta-section{padding:5rem 0;text-align:center;position:relative;overflow:hidden}
.cta-box{background:var(--bg2);border:1px solid var(--brd);border-radius:var(--radius-lg);padding:4rem 2rem;position:relative;overflow:hidden}
.cta-box::before{content:'';position:absolute;top:0;left:0;right:0;height:4px;background:var(--grad)}
.cta-box h2{margin-bottom:1rem}
.cta-box p{margin-bottom:2rem;max-width:500px;margin-left:auto;margin-right:auto}
.cta-buttons{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}

/* ==================== FOOTER ==================== */
footer{background:var(--bg2);border-top:1px solid var(--brd);padding:4rem 0 2rem}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:2rem;margin-bottom:3rem}
.footer-brand p{font-size:.88rem;margin-top:1rem;max-width:300px}
.footer-col h4{font-size:.85rem;font-weight:700;margin-bottom:1rem;text-transform:uppercase;letter-spacing:.06em;color:var(--text)}
.footer-col a{display:block;color:var(--text-muted);font-size:.85rem;padding:.3rem 0;transition:var(--transition)}
.footer-col a:hover{color:var(--accent)}
.footer-soc{display:flex;gap:.8rem;margin-top:1.2rem}
.footer-soc a{width:38px;height:38px;border-radius:50%;background:rgba(255,255,255,.05);display:flex;align-items:center;justify-content:center;font-size:.85rem;color:var(--text-muted);transition:var(--transition)}
.footer-soc a:hover{background:var(--accent);color:#fff;transform:translateY(-2px)}
.footer-bottom{border-top:1px solid var(--brd);padding-top:2rem;display:flex;justify-content:space-between;align-items:center;font-size:.8rem;color:var(--text-muted)}

/* ==================== REVEAL ANIMATION ==================== */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .8s ease,transform .8s ease}
.reveal.in,.reveal.visible{opacity:1;transform:translateY(0)}

/* ==================== PRELOADER ==================== */
.preloader{position:fixed;inset:0;background:var(--bg);display:flex;align-items:center;justify-content:center;z-index:9999;transition:opacity .5s ease}
.preloader.hide{opacity:0;pointer-events:none}
.preloader-spin{width:50px;height:50px;border:3px solid var(--brd);border-top-color:var(--accent);border-radius:50%;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ==================== RESPONSIVE ==================== */
@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr;gap:2.5rem}
  .hero-visual{order:1;max-width:420px;margin:0 auto}
  .hero-float-1{right:5%}
  .hero-float-2{left:5%}
  .features-grid{grid-template-columns:1fr 1fr}
  .tutors-grid{grid-template-columns:repeat(2,1fr)}
  .testi-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:2rem}
  .trust-grid{grid-template-columns:1fr 1fr;gap:1.5rem}
  /* ===== MOBILE NAV MENU ===== */
  header{z-index:400}
  .nav-links{
    display:none;
    position:fixed;
    top:0;left:0;width:100vw;height:100vh;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    background:#0F0F1A;
    padding:4.5rem 0 1rem;
    gap:0;
    z-index:420;
    overflow-y:auto;
    -webkit-overflow-scrolling:touch;
  }
  .nav-links.open{display:flex}
  .nav-links li{width:100%}
  .nav-links a{
    display:block;
    font-size:1.1rem;
    padding:1rem 1.5rem;
    color:var(--text);
    border-bottom:1px solid rgba(255,255,255,.06);
    font-weight:500;
  }
  .nav-links a:active{color:var(--accent);background:rgba(99,102,241,.08)}
  .nav-links a::after{display:none}
  .menu-toggle{display:block;position:fixed;top:1rem;right:1.5rem;z-index:450}
  .nav-actions .btn-primary{display:none}
  .nav-actions .lang-switch{display:none}
  .mobile-lang{display:list-item!important;padding:0 1.5rem}
  .mobile-lang .lang-switch{
    display:block;
    width:100%;
    margin:1rem 0 .5rem;
    padding:1rem;
    text-align:center;
    font-size:1rem;
    border:1px solid var(--brd);
    background:rgba(255,255,255,.05);
    border-radius:50px;
    box-sizing:border-box;
  }
  .mobile-lang .btn{
    display:flex;
    width:100%;
    justify-content:center;
    padding:1rem;
    font-size:1rem;
    margin:.5rem 0 1rem;
    box-sizing:border-box;
  }
}

@media(max-width:768px){
  section{padding:4rem 0}
  .pricing-grid{grid-template-columns:1fr;max-width:480px;margin:3rem auto 0}
  .steps{grid-template-columns:1fr}
  .subjects-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr;gap:1.5rem}
  .features-grid{grid-template-columns:1fr}
  .cta-box{padding:3rem 1.5rem}
  .hero-visual{max-width:360px}
  .hero-float{display:none}
  .hero-card{padding:1.2rem}
  .hero-card-avatar{width:42px;height:42px}
  .hero-stats{gap:1.5rem}
  .hero-stat .num{font-size:1.8rem}
}

@media(max-width:480px){
  section{padding:3rem 0}
  .hero{padding:7rem 0 3rem}
  .hero h1{font-size:1.9rem}
  .hero p{font-size:1rem}
  .hero-stats{gap:1.5rem}
  .hero-stat .num{font-size:1.6rem}
  .wrap{padding:0 1rem}
  .tutors-grid{grid-template-columns:1fr}
  .trust-grid{grid-template-columns:1fr;gap:1.2rem}
  .trust-num{font-size:2rem}
  .price-amount{font-size:2.4rem}
  .btn{padding:.7rem 1.4rem;font-size:.82rem}
  .hero-cta .btn{width:100%;justify-content:center}
  .subject-chip{padding:1rem .8rem}
  .feature-card{padding:1.5rem}
  .step-card{padding:1.8rem 1.5rem}
  .testi-card{padding:1.5rem}
  .footer-bottom{flex-direction:column;gap:.8rem;text-align:center}
  .nav-links a{font-size:1.05rem;padding:.9rem 1.2rem}
}

@keyframes navFadeIn{
  from{opacity:0;transform:translateY(-10px)}
  to{opacity:1;transform:translateY(0)}
}