/* ===========================================================
   Pratik Private Tutorial — Landing Page Styles
   Theme: Minimal, premium, blue & white with subtle physics
   =========================================================== */

:root {
  --blue-50:  #eff6ff;
  --blue-100: #dbeafe;
  --blue-200: #bfdbfe;
  --blue-300: #93c5fd;
  --blue-400: #60a5fa;
  --blue-500: #3b82f6;
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;
  --blue-800: #1e40af;
  --blue-900: #1e3a8a;
  --ink:      #0b1730;
  --ink-2:    #1f2a44;
  --muted:    #5b6b8a;
  --line:     #e6ecf5;
  --bg:       #ffffff;
  --bg-soft:  #f6f9ff;

  --radius: 18px;
  --radius-lg: 24px;
  --shadow-sm: 0 1px 2px rgba(15, 30, 70, 0.06);
  --shadow-md: 0 10px 30px rgba(15, 30, 70, 0.08);
  --shadow-lg: 0 20px 60px rgba(15, 30, 70, 0.12);

  --font-head: 'Manrope', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.6;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  color: var(--ink);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 0.6em;
}

h1 { font-size: clamp(2.4rem, 5vw + 0.5rem, 4.2rem); font-weight: 800; }
h2 { font-size: clamp(1.8rem, 2.4vw + 0.8rem, 2.6rem); font-weight: 700; }
h3 { font-size: 1.35rem; font-weight: 700; }
h4 { font-size: 1.05rem; font-weight: 700; }

p { margin: 0 0 1em; color: var(--ink-2); }

a { color: inherit; text-decoration: none; }

img { max-width: 100%; display: block; }

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Nav ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 28px;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid rgba(30, 58, 138, 0.08);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--ink);
  font-size: 1.05rem;
}

.brand.small { font-size: 0.98rem; }

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--blue-600), var(--blue-800));
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
}

.brand-text strong { color: var(--blue-700); font-weight: 800; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
}

.nav-links a {
  font-size: 0.94rem;
  color: var(--ink-2);
  font-weight: 500;
  transition: color 0.2s ease;
}
.nav-links a:hover { color: var(--blue-700); }

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 10px;
  width: 40px;
  height: 40px;
  color: var(--ink);
  cursor: pointer;
  font-size: 1rem;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 999px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--blue-600);
  color: #fff;
  box-shadow: 0 10px 22px rgba(37, 99, 235, 0.35);
}
.btn-primary:hover {
  background: var(--blue-700);
  box-shadow: 0 14px 28px rgba(37, 99, 235, 0.42);
}

.btn-ghost {
  background: transparent;
  color: var(--blue-700);
  border-color: var(--blue-200);
}
.btn-ghost:hover {
  background: var(--blue-50);
  border-color: var(--blue-300);
}

.btn-white {
  background: #fff;
  color: var(--blue-700);
  border-color: rgba(255, 255, 255, 0.9);
  box-shadow: 0 12px 26px rgba(15, 30, 70, 0.18);
}
.btn-white:hover { background: var(--blue-50); }

.btn-lg { padding: 15px 26px; font-size: 1rem; }
.btn-sm { padding: 9px 16px; font-size: 0.85rem; }
.btn.full { width: 100%; }

/* ===== Hero ===== */
.hero {
  position: relative;
  overflow: hidden;
  padding: 90px 24px 110px;
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(37, 99, 235, 0.10), transparent 60%),
    radial-gradient(900px 500px at -10% 20%, rgba(96, 165, 250, 0.10), transparent 60%),
    var(--bg);
}

.hero-inner {
  position: relative;
  z-index: 2;
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--blue-50);
  color: var(--blue-700);
  border: 1px solid var(--blue-100);
  font-size: 0.84rem;
  font-weight: 600;
  margin-bottom: 22px;
}

.accent {
  background: linear-gradient(120deg, var(--blue-600), var(--blue-400));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  font-family: var(--font-head);
  font-weight: 600;
  color: var(--ink);
  font-size: clamp(1rem, 1.2vw + 0.7rem, 1.25rem);
  margin: 8px 0 18px;
}
.hero-sub .dot { color: var(--blue-400); margin: 0 4px; }

.hero-desc {
  max-width: 660px;
  margin: 0 auto 32px;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-cta {
  display: inline-flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
}

/* Physics background elements */
.physics-bg {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  overflow: hidden;
}

.atom {
  position: absolute;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  opacity: 0.18;
}
.atom span {
  position: absolute;
  inset: 0;
  border: 1.5px solid var(--blue-600);
  border-radius: 50%;
}
.atom span:nth-child(1) { transform: rotate(0deg); }
.atom span:nth-child(2) { transform: rotate(60deg); }
.atom span:nth-child(3) { transform: rotate(120deg); }
.atom::before {
  content: \"\";
  position: absolute;
  top: 50%; left: 50%;
  width: 12px; height: 12px;
  margin: -6px 0 0 -6px;
  background: var(--blue-600);
  border-radius: 50%;
}
.atom-1 { top: -60px; right: -50px; animation: spin 40s linear infinite; }
.atom-2 { bottom: -70px; left: -60px; width: 280px; height: 280px; animation: spin 60s linear infinite reverse; opacity: 0.14; }

.wave {
  position: absolute;
  bottom: 8%;
  left: 0;
  right: 0;
  height: 60px;
  background:
    radial-gradient(circle at 10% 50%, transparent 20px, var(--blue-100) 21px, transparent 22px),
    radial-gradient(circle at 30% 50%, transparent 20px, var(--blue-100) 21px, transparent 22px),
    radial-gradient(circle at 50% 50%, transparent 20px, var(--blue-100) 21px, transparent 22px),
    radial-gradient(circle at 70% 50%, transparent 20px, var(--blue-100) 21px, transparent 22px),
    radial-gradient(circle at 90% 50%, transparent 20px, var(--blue-100) 21px, transparent 22px);
  opacity: 0.35;
  mask-image: linear-gradient(to right, transparent, black, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black, transparent);
}

.formula {
  position: absolute;
  font-family: 'Fira Sans', var(--font-head);
  font-weight: 600;
  color: var(--blue-500);
  opacity: 0.12;
  font-size: 1.4rem;
  letter-spacing: 0.5px;
  user-select: none;
}
.formula-1 { top: 18%; left: 8%; font-size: 2.2rem; }
.formula-2 { top: 30%; right: 10%; font-size: 1.8rem; }
.formula-3 { bottom: 22%; left: 14%; }
.formula-4 { bottom: 30%; right: 18%; }

@keyframes spin { to { transform: rotate(360deg); } }

.scroll-hint {
  position: absolute;
  bottom: 22px;
  left: 50%;
  transform: translateX(-50%);
  width: 26px;
  height: 42px;
  border: 2px solid var(--blue-300);
  border-radius: 20px;
  display: inline-flex;
  justify-content: center;
  padding-top: 6px;
  z-index: 2;
}
.scroll-hint span {
  width: 4px;
  height: 8px;
  background: var(--blue-500);
  border-radius: 4px;
  animation: dropDown 1.6s ease-in-out infinite;
}
@keyframes dropDown {
  0%   { transform: translateY(0); opacity: 1; }
  70%  { transform: translateY(14px); opacity: 0; }
  100% { transform: translateY(0); opacity: 0; }
}

/* ===== Sections ===== */
.section { padding: 90px 0; position: relative; }
.section-alt { background: var(--bg-soft); }

.eyebrow {
  display: inline-block;
  font-family: var(--font-head);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  color: var(--blue-600);
  margin-bottom: 12px;
}
.eyebrow.light { color: rgba(255, 255, 255, 0.85); }

.section-head {
  max-width: 720px;
  margin: 0 auto 48px;
  text-align: center;
}

.muted { color: var(--muted); }
.lead { font-size: 1.15rem; color: var(--ink-2); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 60px;
  align-items: center;
}

/* ===== Glass cards ===== */
.glass-card {
  background: rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid rgba(30, 58, 138, 0.08);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-md);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--blue-200);
}

/* ===== Syllabus ===== */
.syllabus-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.syllabus-card header { margin-bottom: 18px; }
.grade-badge {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--blue-600);
  color: #fff;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  margin-bottom: 12px;
}
.syllabus-card h3 { color: var(--blue-900); }
.syllabus-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}
.syllabus-card li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.96rem;
  color: var(--ink-2);
}
.syllabus-card li i {
  color: var(--blue-500);
  font-size: 0.95rem;
}

/* ===== Features ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.feature-card { text-align: left; padding: 26px 24px; }
.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--blue-50);
  color: var(--blue-700);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  margin-bottom: 14px;
  border: 1px solid var(--blue-100);
}
.feature-card h4 { margin-bottom: 6px; color: var(--ink); }
.feature-card p { font-size: 0.92rem; color: var(--muted); margin: 0; }

/* ===== Why ===== */
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  max-width: 940px;
  margin: 0 auto;
}
.why-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.why-item:hover {
  transform: translateY(-3px);
  border-color: var(--blue-200);
  box-shadow: var(--shadow-md);
}
.why-icon {
  flex: none;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--blue-600), var(--blue-400));
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.28);
}
.why-text { font-family: var(--font-head); font-weight: 600; color: var(--ink); font-size: 0.98rem; }

/* ===== Contact ===== */
.contact-card {
  background: linear-gradient(135deg, var(--blue-700), var(--blue-900));
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 56px;
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 48px;
  align-items: center;
  box-shadow: 0 30px 60px rgba(30, 58, 138, 0.25);
  position: relative;
  overflow: hidden;
}
.contact-card::before {
  content: \"\";
  position: absolute;
  width: 320px;
  height: 320px;
  right: -80px;
  top: -80px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.12), transparent 60%);
  pointer-events: none;
}
.contact-card h2 { color: #fff; margin-bottom: 12px; }
.contact-card p { color: rgba(255, 255, 255, 0.85); margin: 0; }

.contact-right { display: grid; gap: 18px; }
.phone-block {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 16px;
  padding: 18px 22px;
  backdrop-filter: blur(10px);
}
.phone-label {
  display: block;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 6px;
  font-weight: 600;
}
.phone-label i { margin-right: 6px; }
.phone-number {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.02em;
}

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  background: #fff;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.copy { color: var(--muted); font-size: 0.9rem; margin: 0; }

/* ===== Reveal animation ===== */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .about-grid { grid-template-columns: 1fr; gap: 24px; }
  .syllabus-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-card { grid-template-columns: 1fr; padding: 40px 32px; gap: 28px; }
}

@media (max-width: 720px) {
  .nav { padding: 12px 18px; }
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .nav-links {
    position: absolute;
    top: 64px;
    right: 12px;
    left: 12px;
    background: #fff;
    padding: 18px;
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
    border: 1px solid var(--line);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links .btn { width: 100%; justify-content: center; }

  .hero { padding: 60px 20px 90px; }
  .section { padding: 64px 0; }
  .features-grid, .why-grid { grid-template-columns: 1fr; }
  .contact-card { padding: 32px 22px; }
  .formula { display: none; }
  .atom-1 { width: 160px; height: 160px; }
  .atom-2 { width: 200px; height: 200px; }
}

@media (max-width: 420px) {
  .btn-lg { padding: 13px 20px; font-size: 0.95rem; }
  h1 { font-size: 2.2rem; }
}