/* ============================================
   STUDYHUB — Global Stylesheet
   Design & Developed by Sumit Thakare
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@700;900&family=JetBrains+Mono:wght@400;600&family=DM+Sans:wght@300;400;500;600&display=swap');

/* ── CSS VARIABLES ── */
:root {
  --bg: #0a0e1a;
  --surface: #111827;
  --surface2: #1a2235;
  --border: #1e2d45;
  --accent: #00d4ff;
  --accent2: #ff6b35;
  --accent3: #7c3aed;
  --accent4: #10b981;
  --accent5: #f59e0b;
  --text: #e2e8f0;
  --muted: #64748b;
  --heading: #f8fafc;
  --tag-bg: rgba(0,212,255,0.08);
  --card-hover: rgba(0,212,255,0.05);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.25s ease;
}

/* ── RESET ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  font-size: 15px;
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── GRID BACKGROUND ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,212,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.025) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
  z-index: 0;
}

/* ── TYPOGRAPHY ── */
h1, h2, h3 { font-family: 'Playfair Display', serif; color: var(--heading); line-height: 1.2; }
h1 { font-size: clamp(32px, 5vw, 60px); font-weight: 900; }
h2 { font-size: clamp(22px, 3vw, 36px); font-weight: 700; }
h3 { font-size: 20px; }
a { text-decoration: none; color: inherit; }
strong { color: var(--heading); }
code { font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--accent); }

/* ── LAYOUT ── */
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; position: relative; z-index: 1; }
.section-gap { padding: 60px 0; }

/* ── NAVBAR ── */
/* ── NAVBAR ── */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10,14,26,0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Playfair Display', serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--heading);
}

.nav-logo .logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--accent), var(--accent3));
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  padding: 7px 14px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
  transition: var(--transition);
  border: 1px solid transparent;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  background: var(--tag-bg);
  border-color: rgba(0,212,255,0.2);
}

.nav-insta {
  display: flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888);
  color: white !important;
  padding: 7px 14px !important;
  border-radius: 6px !important;
  font-size: 12px !important;
  font-weight: 600 !important;
  border: none !important;
}

.nav-insta:hover { opacity: 0.9; transform: translateY(-1px); }

/* ============================================
   MOBILE NAVBAR FIX - Show Services on Mobile
   ============================================ */
@media (max-width: 768px) {
  .nav-inner {
    flex-direction: column;
    gap: 12px;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px;
  }

  .nav-links a {
    display: inline-block !important;
    padding: 5px 12px;
    font-size: 12px;
  }
}

@media (max-width: 480px) {
  .nav-links a {
    padding: 4px 10px;
    font-size: 11px;
  }

  .nav-insta {
    padding: 5px 10px !important;
    font-size: 11px !important;
  }
}
/* ── BADGE ── */
.badge {
  display: inline-block;
  background: var(--tag-bg);
  border: 1px solid rgba(0,212,255,0.25);
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 2px;
  padding: 4px 12px;
  border-radius: 3px;
  text-transform: uppercase;
}

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #0a0e1a;
}
.btn-primary:hover { background: #00bbdf; transform: translateY(-2px); }

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid rgba(0,212,255,0.4) !important;
}
.btn-outline:hover { background: var(--tag-bg); transform: translateY(-2px); }

/* ── FOOTER ── */
footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 40px 0 24px;
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-brand .nav-logo { margin-bottom: 12px; }
.footer-brand p { font-size: 13px; color: var(--muted); line-height: 1.7; max-width: 260px; }

.footer-col h4 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 13px; color: var(--muted); transition: var(--transition); }
.footer-col ul li a:hover { color: var(--accent); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-bottom p { font-size: 12px; color: var(--muted); }
.footer-bottom span { color: var(--accent); font-family: 'JetBrains Mono', monospace; }

.footer-social { display: flex; gap: 10px; }
.footer-social a {
  width: 32px; height: 32px;
  border-radius: 6px;
  background: var(--surface2);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 14px;
  color: var(--muted);
  transition: var(--transition);
}
.footer-social a:hover { color: var(--accent); border-color: rgba(0,212,255,0.3); }

/* ── POPUP ── */
.popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.75);
  backdrop-filter: blur(6px);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.4s ease;
}

.popup-box {
  background: var(--surface);
  border: 1px solid rgba(0,212,255,0.25);
  border-radius: 20px;
  padding: 40px;
  max-width: 480px;
  width: 100%;
  text-align: center;
  position: relative;
  animation: slideUp 0.4s ease;
  box-shadow: 0 24px 80px rgba(0,0,0,0.6), 0 0 60px rgba(0,212,255,0.08);
}

.popup-logo {
  width: 72px; height: 72px;
  background: linear-gradient(135deg, var(--accent), var(--accent3));
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 36px;
  margin: 0 auto 20px;
}

.popup-box h2 { font-size: 24px; margin-bottom: 8px; }
.popup-box p { color: var(--muted); font-size: 14px; margin-bottom: 24px; line-height: 1.7; }

.popup-insta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888);
  color: white;
  padding: 12px 24px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 20px;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  width: 100%;
  justify-content: center;
}
.popup-insta:hover { opacity: 0.9; transform: translateY(-2px); }

.popup-close {
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
  background: none;
  border: none;
  color: var(--muted);
  transition: var(--transition);
}
.popup-close:hover { color: var(--text); }

.popup-close-x {
  position: absolute;
  top: 16px; right: 20px;
  background: none; border: none;
  color: var(--muted); font-size: 20px;
  cursor: pointer;
  transition: var(--transition);
  line-height: 1;
}
.popup-close-x:hover { color: var(--heading); }

.popup-divider { 
  display: flex; align-items: center; gap: 10px; 
  margin-bottom: 16px; color: var(--muted); font-size: 12px;
}
.popup-divider::before, .popup-divider::after {
  content: ''; flex: 1; height: 1px; background: var(--border);
}

/* ── ANIMATIONS ── */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }

/* ── UTILITY ── */
.highlight { color: var(--accent); }
.hl-orange { color: var(--accent2); }
.hl-green { color: var(--accent4); }
.hl-purple { color: #a78bfa; }
.hl-yellow { color: var(--accent5); }
.text-muted { color: var(--muted); }
.mono { font-family: 'JetBrains Mono', monospace; }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .nav-links a:not(.nav-insta):not(.active) { display: none; }
}

@media (max-width: 480px) {
  .popup-box { padding: 28px 20px; }
}