/* ==========================================================================
   Excellence Tutor — Design System
   Palette: Ink Navy #0B1220, Deep Blue #142848, Chalk #F5F3EC,
            Gold #C9A227, Tick-Red #D1495B, Teal #2E6F6E
   Type: Fraunces (display/serif) + Inter (body) + IBM Plex Mono (equations/labels)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,600;9..144,700;9..144,900&family=Inter:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  --ink:#0B1220;
  --deep:#142848;
  --chalk:#F5F3EC;
  --chalk-dim:#E8E4D8;
  --gold:#C9A227;
  --gold-soft:#e8cf8c;
  --tick:#D1495B;
  --teal:#2E6F6E;
  --line: rgba(245,243,236,0.14);
  --shadow: 0 20px 50px rgba(11,18,32,0.35);
  --radius: 14px;
  --maxw: 1180px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--ink);
  color:var(--chalk);
  font-family:'Inter',system-ui,sans-serif;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:'Fraunces',serif;
  font-weight:700;
  line-height:1.08;
  margin:0 0 .5em;
  letter-spacing:-0.01em;
}
p{margin:0 0 1em;color:rgba(245,243,236,0.82);}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;}
ul{margin:0;padding:0;list-style:none;}

.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
.mono{font-family:'IBM Plex Mono',monospace;}
.eyebrow{
  font-family:'IBM Plex Mono',monospace;
  font-size:.78rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--gold);
  display:inline-flex;
  align-items:center;
  gap:.5em;
}
.eyebrow::before{content:'';width:22px;height:1px;background:var(--gold);display:inline-block;}

/* ---------------- Header ---------------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(11,18,32,0.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.nav{
  display:flex;align-items:center;justify-content:space-between;
  padding:10px 24px;max-width:var(--maxw);margin:0 auto;
  gap:16px;
}
.brand{
  display:flex;align-items:center;gap:14px;
  font-family:'Fraunces',serif;font-weight:700;font-size:1.3rem;color:var(--chalk);
  white-space:nowrap;text-decoration:none;
}
/* Logo frame — premium circular gold-ring badge */
.logo-frame {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  flex-shrink: 0;
  border-radius: 50%;
  /* Layered ring: dark gap → gold ring → soft outer glow */
  box-shadow:
    0 0 0 2px rgba(11,18,32,1),
    0 0 0 4px rgba(201,162,39,0.75),
    0 0 0 5px rgba(11,18,32,0.6),
    0 0 18px rgba(201,162,39,0.30),
    0 6px 22px rgba(0,0,0,0.55);
  background: radial-gradient(circle at 50% 40%, rgba(201,162,39,0.10) 0%, rgba(11,18,32,0.95) 70%);
  transition: box-shadow 0.35s ease, transform 0.35s ease;
}
.logo-frame::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: 50%;
  background: conic-gradient(
    rgba(201,162,39,0.9) 0deg,
    rgba(139,105,20,0.5) 90deg,
    rgba(201,162,39,0.9) 180deg,
    rgba(245,210,80,0.7) 270deg,
    rgba(201,162,39,0.9) 360deg
  );
  z-index: 0;
  opacity: 0.55;
  border-radius: 50%;
}
.logo-frame:hover {
  transform: scale(1.05);
  box-shadow:
    0 0 0 2px rgba(11,18,32,1),
    0 0 0 4px rgba(201,162,39,0.95),
    0 0 0 5px rgba(11,18,32,0.5),
    0 0 28px rgba(201,162,39,0.50),
    0 8px 30px rgba(0,0,0,0.6);
}
.brand-logo-img{
  position: relative;
  z-index: 1;
  height: 60px;
  width: 60px;
  object-fit: contain;
  object-position: center;
  border-radius: 50%;
  background-color: rgba(11,18,32,0.92);
  display: block;
  transition: transform 0.35s ease;
}
.brand-mark{
  width:38px;height:38px;border-radius:8px;
  background:linear-gradient(155deg,var(--deep),var(--ink));
  border:1px solid var(--gold-soft);
  display:flex;align-items:center;justify-content:center;
  font-family:'IBM Plex Mono',monospace;color:var(--gold);font-weight:600;font-size:1rem;
}
.brand small{display:block;font-family:'Inter',sans-serif;font-weight:500;font-size:.62rem;letter-spacing:.12em;text-transform:uppercase;color:var(--teal);}

.nav-links{display:flex;align-items:center;gap:6px;margin-left:40px;}
.nav-links a{
  padding:10px 14px;border-radius:8px;font-size:.94rem;font-weight:500;
  color:rgba(245,243,236,0.75);transition:background .15s,color .15s;
}
.nav-links a:hover,.nav-links a.active{background:rgba(245,243,236,0.08);color:var(--chalk);}

.nav-cta{display:flex;gap:10px;align-items:center;}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 18px;border-radius:9px;font-weight:600;font-size:.92rem;
  border:1px solid transparent;cursor:pointer;transition:transform .15s,box-shadow .15s,background .15s;
  white-space:nowrap;
}
.btn:hover{transform:translateY(-1px);}
.btn-gold{background:var(--gold);color:var(--ink);box-shadow:0 8px 22px rgba(201,162,39,0.25);}
.btn-gold:hover{background:var(--gold-soft);}
.btn-outline{border-color:var(--line);color:var(--chalk);}
.btn-outline:hover{border-color:var(--gold-soft);background:rgba(245,243,236,0.05);}
.btn-teal{background:var(--teal);color:var(--chalk);}
.btn-teal:hover{background:#357f7e;}
.btn-tick{background:var(--tick);color:var(--chalk);}
.btn-tick:hover{background:#e15a6d;}
.btn-whatsapp{background:#25D366;color:#000;font-weight:700;box-shadow:0 4px 14px rgba(37,211,102,0.35);border:none;}
.btn-whatsapp:hover{background:#20bd5a;color:#000;box-shadow:0 6px 20px rgba(37,211,102,0.5);}

.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:8px;color:var(--chalk);width:42px;height:42px;font-size:1.2rem;cursor:pointer;}

/* ---------------- Hero ---------------- */
.hero{
  position:relative;overflow:hidden;
  padding:96px 0 72px;
  border-bottom:1px solid var(--line);
}
.hero-grid{
  display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;
}
.hero h1{font-size:clamp(2.3rem,4.4vw,3.6rem);color:var(--chalk);}
.hero h1 em{font-style:normal;color:var(--gold);}
.hero-sub{font-size:1.08rem;max-width:46ch;color:rgba(245,243,236,0.78);}
.hero-actions{display:flex;gap:14px;margin-top:28px;flex-wrap:wrap;}
.hero-stats{display:flex;gap:32px;margin-top:44px;flex-wrap:wrap;}
.stat b{display:block;font-family:'Fraunces',serif;font-size:1.7rem;color:var(--chalk);}
.stat span{font-size:.82rem;color:rgba(245,243,236,0.6);}

/* Signature element: the chalkboard equation card with tutor's red-pen tick */
.board{
  position:relative;
  background:linear-gradient(160deg,#16324f,#0d2036);
  border:1px solid rgba(245,243,236,0.12);
  border-radius:18px;
  padding:34px 30px;
  box-shadow:var(--shadow);
}
.board::before{
  content:'';position:absolute;inset:0;border-radius:18px;pointer-events:none;
  background-image:radial-gradient(circle,rgba(245,243,236,0.05) 1px,transparent 1px);
  background-size:16px 16px;
}
.board-line{
  display:flex;align-items:center;gap:14px;
  font-family:'IBM Plex Mono',monospace;font-size:1.05rem;
  padding:13px 4px;border-bottom:1px dashed rgba(245,243,236,0.14);
  position:relative;color:var(--chalk-dim);
}
.board-line:last-child{border-bottom:none;}
.board-line .tick{color:var(--tick);font-size:1.3rem;transform:rotate(-6deg);}
.board-line .tag{
  margin-left:auto;font-family:'Inter',sans-serif;font-size:.72rem;
  padding:3px 9px;border-radius:20px;background:rgba(46,111,110,0.35);color:#8fd6d3;
  text-transform:uppercase;letter-spacing:.06em;
}

/* ---------------- Sections ---------------- */
section{padding:76px 0;}
.section-head{max-width:640px;margin-bottom:48px;}
.section-head h2{font-size:clamp(1.7rem,3vw,2.3rem);color:var(--chalk);}

.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:32px;}

.card{
  background:linear-gradient(160deg,rgba(20,40,72,0.55),rgba(11,18,32,0.4));
  border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;
  transition:border-color .15s,transform .15s;
}
.card:hover{border-color:rgba(201,162,39,0.4);transform:translateY(-3px);}
.card .icon{
  width:44px;height:44px;border-radius:10px;background:rgba(201,162,39,0.12);
  display:flex;align-items:center;justify-content:center;font-family:'IBM Plex Mono',monospace;
  color:var(--gold);font-weight:600;margin-bottom:16px;
}
.card h3{font-size:1.15rem;color:var(--chalk);margin-bottom:8px;}
.card p{font-size:.93rem;margin-bottom:0;}

.subject-chip{
  display:inline-flex;align-items:center;gap:6px;font-family:'IBM Plex Mono',monospace;
  font-size:.75rem;padding:4px 10px;border-radius:20px;background:rgba(46,111,110,0.22);
  color:#a9e0dd;margin:2px 6px 2px 0;
}

.band{
  background:var(--deep);border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}

.quote{
  border-left:3px solid var(--gold);padding-left:22px;font-family:'Fraunces',serif;
  font-size:1.3rem;font-style:italic;color:var(--chalk);max-width:60ch;
}

footer{
  border-top:1px solid var(--line);padding:44px 0 28px;color:rgba(245,243,236,0.55);font-size:.88rem;
}
.footer-grid{display:flex;justify-content:space-between;flex-wrap:wrap;gap:24px;margin-bottom:24px;}
.footer-links{display:flex;gap:22px;flex-wrap:wrap;}

/* ---------------- Page header (non-home) ---------------- */
.page-hero{padding:64px 0 48px;border-bottom:1px solid var(--line);}
.page-hero h1{font-size:clamp(2rem,4vw,2.8rem);}
.breadcrumb{font-family:'IBM Plex Mono',monospace;font-size:.78rem;color:var(--teal);margin-bottom:14px;}

/* ---------------- Contact ---------------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:start;}
.contact-methods .card{margin-bottom:16px;}
.form-field{margin-bottom:16px;}
.form-field label{display:block;font-size:.85rem;margin-bottom:6px;color:var(--chalk-dim);}
.form-field input,.form-field textarea,.form-field select{
  width:100%;padding:12px 14px;background:rgba(245,243,236,0.05);
  border:1px solid var(--line);border-radius:9px;color:var(--chalk);font-family:'Inter',sans-serif;font-size:.95rem;
}
.form-field textarea{resize:vertical;min-height:110px;}
.form-field input:focus,.form-field textarea:focus,.form-field select:focus{border-color:var(--gold-soft);}

/* ---------------- Video Lectures ---------------- */
.video-card{
  background:linear-gradient(160deg,rgba(20,40,72,0.55),rgba(11,18,32,0.4));
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
  display: flex;
  flex-direction: column;
}
.video-card:hover{
  transform: translateY(-4px);
  border-color: rgba(201,162,39,0.5);
  box-shadow: 0 12px 30px rgba(11,18,32,0.5);
}
.video-thumb{
  position:relative;aspect-ratio:16/9;background:#060d19;
  display:flex;align-items:center;justify-content:center;
  overflow:hidden;
  border-bottom: 1px solid var(--line);
}
.video-thumb video,
.video-thumb iframe{
  width:100%;
  height:100%;
  border:0;
  display:block;
  background:#000;
}
.video-thumb video{
  object-fit:cover;
}
.video-thumb .lock{
  position:absolute;top:12px;right:12px;background:rgba(11,18,32,0.85);
  backdrop-filter:blur(6px);border: 1px solid rgba(46,111,110,0.4);
  border-radius:8px;padding:4px 10px;font-size:.72rem;font-weight:600;
  font-family:'IBM Plex Mono',monospace;color:#8fd6d3;
  pointer-events: none;
  z-index: 2;
}
.video-body{
  padding:18px 20px 20px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}
.video-body h3{font-size:1.05rem;line-height:1.35;margin-bottom:8px;color:var(--chalk);}
.video-meta{
  display:flex;justify-content:space-between;align-items:center;margin-top:auto;
  padding-top:16px;border-top:1px solid rgba(245,243,236,0.08);
}
.price{font-family:'Fraunces',serif;font-weight:700;color:var(--gold);font-size:1.15rem;}

.filter-bar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:32px;}
.filter-bar button{
  padding:8px 18px;border-radius:20px;border:1px solid var(--line);background:rgba(245,243,236,0.04);
  color:var(--chalk-dim);font-size:.88rem;cursor:pointer;transition:all .15s ease;
  font-family:'Inter',sans-serif;
}
.filter-bar button:hover{border-color:var(--gold-soft);background:rgba(245,243,236,0.08);color:var(--chalk);}
.filter-bar button.active{background:var(--gold);color:var(--ink);border-color:var(--gold);font-weight:600;}

/* Wallet / earnings mini widget (about the withdraw feature, shown on Services) */
.wallet-box{
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;
  background:rgba(46,111,110,0.14);border:1px solid rgba(46,111,110,0.35);border-radius:14px;padding:20px 24px;
}
.wallet-methods{display:flex;gap:10px;flex-wrap:wrap;}
.wallet-tag{font-family:'IBM Plex Mono',monospace;font-size:.75rem;padding:6px 12px;border-radius:8px;background:rgba(245,243,236,0.06);border:1px solid var(--line);}

/* ---------------- Modal (WhatsApp / floating CTA) ---------------- */
.float-cta{
  position:fixed;bottom:22px;right:22px;z-index:60;display:flex;flex-direction:column;gap:12px;
}
.float-cta a{
  width:56px;height:56px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-size:1.3rem;box-shadow:0 10px 26px rgba(0,0,0,0.4);
}

/* ---------------- Responsive ---------------- */
@media (max-width:920px){
  .hero-grid{grid-template-columns:1fr;}
  .grid-3{grid-template-columns:1fr 1fr;}
  .grid-4{grid-template-columns:1fr 1fr;}
  .grid-2{grid-template-columns:1fr;}
  .contact-grid{grid-template-columns:1fr;}
}
@media (max-width:720px){
  .nav{padding:8px 16px;}
  .logo-frame{width:58px;height:58px;}
  .brand-logo-img{height:48px;width:48px;}
  .brand{font-size:1.1rem;gap:10px;}
  .nav-links{position:fixed;top:75px;left:0;right:0;background:var(--ink);
    flex-direction:column;align-items:stretch;padding:12px 20px 20px;border-bottom:1px solid var(--line);
    display:none;}
  .nav-links.open{display:flex;}
  .nav-cta .btn-outline{display:none;}
  .nav-toggle{display:flex;align-items:center;justify-content:center;}
  .grid-3{grid-template-columns:1fr;}
  .grid-4{grid-template-columns:1fr 1fr;}
  .hero{padding:64px 0 48px;}
  .hero-stats{gap:22px;}
  section{padding:56px 0;}
}
@media (max-width:480px){
  .logo-frame{width:50px;height:50px;}
  .brand-logo-img{height:42px;width:42px;}
  .brand span{font-size:0.9rem;}
  .grid-4{grid-template-columns:1fr;}
  .float-cta a{width:50px;height:50px;font-size:1.1rem;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  .card,.btn{transition:none;}
}