@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#f0f4fb;
  --surface:#ffffff;
  --surface2:#f4f7ff;
  --border:#dde5f4;
  --primary:#1a56db;
  --cyan:#0891b2;
  --text:#0f172a;
  --muted:#64748b;
  --danger:#ef4444;
  --success:#10b981;
}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:'Inter',sans-serif;min-height:100vh;overflow-x:hidden}

/* ── AUTH PAGES ── */
.auth-page{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:20px}

.auth-card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:20px;
  padding:44px 40px;
  width:100%;max-width:420px;
  box-shadow:0 8px 32px rgba(26,86,219,.08);
}

.auth-logo{display:flex;justify-content:center;margin-bottom:32px}
.auth-logo img{height:56px}

.auth-title{font-size:22px;font-weight:800;color:var(--text);text-align:center;margin-bottom:6px}
.auth-sub{font-size:14px;color:var(--muted);text-align:center;margin-bottom:28px}

.form-group{margin-bottom:16px}
.form-group label{display:block;font-size:13px;font-weight:600;color:var(--muted);margin-bottom:7px;letter-spacing:.3px}
.form-group input{
  width:100%;padding:13px 16px;
  background:#f8fafc;
  border:1.5px solid var(--border);
  border-radius:12px;
  color:var(--text);font-size:15px;
  font-family:'Inter',sans-serif;
  outline:none;transition:border-color .2s,box-shadow .2s;
}
.form-group input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(26,86,219,.08)}
.form-group input::placeholder{color:#b0bec5}

.btn-primary{
  width:100%;padding:14px;
  background:linear-gradient(135deg,#1a56db,#0891b2);
  border:none;border-radius:12px;
  color:#fff;font-size:16px;font-weight:700;
  font-family:'Inter',sans-serif;
  cursor:pointer;transition:opacity .2s,transform .15s;
  margin-top:6px;
}
.btn-primary:hover{opacity:.92;transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0)}

.auth-switch{text-align:center;margin-top:20px;font-size:14px;color:var(--muted)}
.auth-switch a{color:var(--primary);text-decoration:none;font-weight:600}
.auth-switch a:hover{text-decoration:underline}

.error-msg{
  background:rgba(239,68,68,.08);border:1px solid rgba(239,68,68,.25);
  border-radius:10px;padding:11px 14px;font-size:13px;color:#dc2626;
  margin-bottom:14px;display:none;
}

/* ── LANDING ── */
.landing{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;padding:40px 20px;background:var(--bg);text-align:center}
.landing-logo img{height:90px;margin-bottom:36px}
.landing-tagline{font-size:15px;color:var(--muted);margin-bottom:48px;max-width:340px;line-height:1.6}
.landing-btns{display:flex;gap:14px;flex-wrap:wrap;justify-content:center}
.btn-outline{
  padding:14px 40px;border:2px solid var(--primary);border-radius:12px;
  color:var(--primary);font-size:16px;font-weight:700;
  font-family:'Inter',sans-serif;background:transparent;
  cursor:pointer;text-decoration:none;transition:all .2s;
}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-solid{
  padding:14px 40px;
  background:linear-gradient(135deg,var(--primary),var(--cyan));
  border:none;border-radius:12px;color:#fff;
  font-size:16px;font-weight:700;font-family:'Inter',sans-serif;
  cursor:pointer;text-decoration:none;transition:opacity .2s,transform .15s;
}
.btn-solid:hover{opacity:.9;transform:translateY(-1px)}

/* ── DASHBOARD ── */
.dash-page{min-height:100vh;padding:40px 20px}
.dash-header{display:flex;flex-direction:column;align-items:center;margin-bottom:48px}
.dash-header img{height:60px;margin-bottom:14px}
.dash-header h1{font-size:26px;font-weight:800;color:var(--text);letter-spacing:-.5px}
.dash-header p{font-size:14px;color:var(--muted);margin-top:4px}

.dash-section{max-width:700px;margin:0 auto 36px}
.dash-section-title{font-size:13px;font-weight:700;color:var(--muted);letter-spacing:1px;text-transform:uppercase;margin-bottom:14px}

.grade-grid{display:flex;flex-wrap:wrap;gap:10px}
.grade-btn{
  padding:14px 22px;
  background:var(--surface);
  border:2px solid var(--border);
  border-radius:12px;
  color:var(--text);font-size:15px;font-weight:700;
  font-family:'Inter',sans-serif;cursor:pointer;transition:all .2s;
  min-width:72px;text-align:center;
  box-shadow:0 2px 8px rgba(0,0,0,.04);
}
.grade-btn:hover{border-color:var(--primary);color:var(--primary)}
.grade-btn.active{background:linear-gradient(135deg,var(--primary),var(--cyan));border-color:transparent;color:#fff}

.subject-grid{display:flex;gap:12px;flex-wrap:wrap}
.subject-btn{
  padding:14px 28px;
  background:var(--surface);border:2px solid var(--border);
  border-radius:12px;color:var(--text);font-size:15px;font-weight:600;
  font-family:'Inter',sans-serif;cursor:pointer;transition:all .2s;
  box-shadow:0 2px 8px rgba(0,0,0,.04);
}
.subject-btn:hover{border-color:var(--cyan);color:var(--cyan)}
.subject-btn.active{background:linear-gradient(135deg,var(--cyan),#0369a1);border-color:transparent;color:#fff}

.subject-section{display:none}
.subject-section.visible{display:block}

.dash-continue{max-width:700px;margin:0 auto;margin-top:40px}
.dash-continue button{
  padding:16px 48px;
  background:linear-gradient(135deg,var(--primary),var(--cyan));
  border:none;border-radius:14px;color:#fff;font-size:17px;font-weight:700;
  font-family:'Inter',sans-serif;cursor:pointer;transition:opacity .2s,transform .15s;
  box-shadow:0 4px 16px rgba(26,86,219,.25);
}
.dash-continue button:hover{opacity:.9;transform:translateY(-1px)}
.dash-continue button:disabled{opacity:.35;cursor:not-allowed;transform:none;box-shadow:none}

/* ── CONTENT PAGE ── */
.content-page{min-height:100vh;padding:32px 20px 60px}
.content-header{
  display:flex;align-items:center;gap:16px;
  max-width:1200px;margin:0 auto 28px;
  padding-bottom:20px;border-bottom:1px solid var(--border);
}
.content-header img{height:46px}
.content-header-info h2{font-size:20px;font-weight:800;color:var(--text)}
.content-header-info p{font-size:13px;color:var(--muted);margin-top:3px}
.content-header-back{
  margin-left:auto;padding:9px 18px;
  background:var(--surface);border:1px solid var(--border);
  border-radius:10px;color:var(--muted);font-size:13px;font-weight:600;
  cursor:pointer;text-decoration:none;transition:all .2s;white-space:nowrap;
  box-shadow:0 1px 4px rgba(0,0,0,.04);
}
.content-header-back:hover{color:var(--primary);border-color:var(--primary)}

/* Card grids */
.cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}

.content-card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:16px;overflow:hidden;
  transition:border-color .2s,transform .2s,box-shadow .2s;
  box-shadow:0 2px 8px rgba(0,0,0,.05);
}
.content-card:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:0 8px 24px rgba(26,86,219,.12)}

.card-preview{width:100%;height:150px;background:var(--surface2);display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}
.card-preview.ppt-preview{background:linear-gradient(135deg,#eff6ff,#dbeafe)}
.card-preview.qmj-preview{background:linear-gradient(135deg,#f0fdf4,#dcfce7)}
.card-preview.video-preview{background:linear-gradient(135deg,#f5f3ff,#ede9fe);cursor:pointer}
.card-preview-icon{font-size:42px;opacity:.7}
.card-preview video{width:100%;height:100%;object-fit:cover}
.card-preview .play-btn{position:absolute;width:44px;height:44px;background:rgba(255,255,255,.6);border-radius:50%;display:flex;align-items:center;justify-content:center;backdrop-filter:blur(6px);transition:background .2s}
.card-preview:hover .play-btn{background:rgba(255,255,255,.8)}

.card-body{padding:14px 16px}
.card-title{font-size:14px;font-weight:700;color:var(--text);margin-bottom:4px;line-height:1.3}
.card-meta{font-size:12px;color:var(--muted)}
.card-footer{padding:0 16px 14px;display:flex;justify-content:flex-end}
.btn-download{
  padding:8px 18px;
  background:linear-gradient(135deg,var(--primary),var(--cyan));
  border:none;border-radius:8px;color:#fff;font-size:13px;font-weight:700;
  font-family:'Inter',sans-serif;cursor:pointer;transition:opacity .2s;
}
.btn-download:hover{opacity:.85}
.btn-download.done{background:rgba(16,185,129,.12);color:#059669;cursor:default}
.btn-download.done:hover{opacity:1}

.card-empty{
  background:var(--surface);border:2px dashed var(--border);border-radius:16px;
  height:200px;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:8px;color:var(--muted);font-size:13px;
}

/* ── PAYMENT MODAL ── */
.modal-overlay{
  position:fixed;inset:0;
  background:rgba(15,23,42,.45);backdrop-filter:blur(4px);
  z-index:1000;display:flex;align-items:center;justify-content:center;
  padding:20px;opacity:0;pointer-events:none;transition:opacity .2s;
}
.modal-overlay.open{opacity:1;pointer-events:all}
.modal-box{
  background:var(--surface);border:1px solid var(--border);
  border-radius:20px;padding:36px 32px;max-width:400px;width:100%;
  box-shadow:0 24px 60px rgba(26,86,219,.15);
  transform:translateY(16px);transition:transform .2s;position:relative;
}
.modal-overlay.open .modal-box{transform:translateY(0)}

.modal-close{
  position:absolute;top:16px;right:16px;
  background:var(--surface2);border:1px solid var(--border);border-radius:8px;
  width:32px;height:32px;color:var(--muted);font-size:18px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
}
.modal-title{font-size:20px;font-weight:800;color:var(--text);margin-bottom:6px;text-align:center}
.modal-sub{font-size:14px;color:var(--muted);text-align:center;margin-bottom:24px}

.price-tag{text-align:center;margin-bottom:28px}
.price-amount{
  font-size:42px;font-weight:900;
  background:linear-gradient(135deg,var(--primary),var(--cyan));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.price-period{font-size:14px;color:var(--muted);margin-top:4px}

.payment-info{
  background:#f8fafc;border:1px solid var(--border);
  border-radius:12px;padding:18px 20px;margin-bottom:20px;
}
.payment-info-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.payment-info-row:last-child{margin-bottom:0}
.payment-label{font-size:13px;color:var(--muted)}
.payment-value{font-size:14px;font-weight:700;color:var(--text)}
.payment-phone{font-size:20px;font-weight:900;color:var(--primary);letter-spacing:1px}
.kaspi-badge{display:flex;align-items:center}

.btn-whatsapp{
  width:100%;padding:14px;
  background:linear-gradient(135deg,#25D366,#128C7E);
  border:none;border-radius:12px;color:#fff;font-size:15px;font-weight:700;
  font-family:'Inter',sans-serif;cursor:pointer;
  display:flex;align-items:center;justify-content:center;gap:8px;
  transition:opacity .2s;
}
.btn-whatsapp:hover{opacity:.9}

/* ── NAV BAR ── */
.top-nav{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 24px;
  background:rgba(255,255,255,.95);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
  position:sticky;top:0;z-index:100;
  box-shadow:0 1px 12px rgba(26,86,219,.06);
}
.top-nav img{height:40px}
.nav-user{display:flex;align-items:center;gap:10px}
.nav-user-name{font-size:14px;font-weight:600;color:var(--text)}
.btn-logout{
  padding:7px 16px;
  background:var(--surface2);border:1px solid var(--border);
  border-radius:8px;color:var(--muted);font-size:13px;font-weight:600;
  cursor:pointer;font-family:'Inter',sans-serif;transition:all .2s;
}
.btn-logout:hover{color:var(--danger);border-color:var(--danger)}

/* ── RESPONSIVE ── */
@media(max-width:600px){
  /* Auth */
  .auth-card{padding:28px 20px}
  .auth-title{font-size:19px}

  /* Nav */
  .top-nav{padding:10px 14px}
  .top-nav img{height:34px}
  .nav-user-name{display:none}
  .btn-logout{padding:6px 12px;font-size:12px}

  /* Dashboard */
  .dash-page{padding:24px 14px}
  .dash-header h1{font-size:20px}
  .dash-header p{font-size:13px}
  .grade-grid{justify-content:center}
  .grade-btn{padding:12px 16px;font-size:14px}
  .subject-btn{padding:12px 20px;font-size:14px}
  .dash-continue button{width:100%;padding:15px}

  /* Content */
  .content-page{padding:20px 12px 60px}
  .content-header{gap:10px;margin-bottom:18px;padding-bottom:14px}
  .content-header img{height:36px}
  .content-header-info h2{font-size:16px}
  .content-header-info p{font-size:12px}
  .content-header-back{padding:7px 12px;font-size:12px}
  .cards-grid{grid-template-columns:1fr}

  /* Payment modal */
  .modal-box{padding:28px 20px}
  .price-amount{font-size:34px}
  .payment-phone{font-size:17px}
}