/* ====================================
   EnglishTeacher.pro - Modern Stylesheet
   ==================================== */

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-primary: #0a1f44;
  --color-primary-light: #132d5e;
  --color-accent: #f0b429;
  --color-accent-hover: #d49a1a;
  --color-blue: #3b82f6;
  --color-blue-light: #60a5fa;
  --color-blue-dark: #2563eb;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-dark: #0f172a;
  --color-border: #e2e8f0;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --max-width: 1140px;
  --nav-height: 70px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; scroll-padding-top: var(--nav-height); }

body {
  font-family: var(--font-main);
  color: var(--color-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

img { max-width: 100%; height: auto; }
a { text-decoration: none; color: inherit; }

/* --- Typography --- */
h1, h2, h3, h4 { line-height: 1.2; font-weight: 700; }
.highlight { color: var(--color-accent); }

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-blue);
  margin-bottom: 12px;
  background: rgba(59,130,246,0.08);
  padding: 4px 14px;
  border-radius: 20px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  color: var(--color-primary);
  margin-bottom: 24px;
  max-width: 640px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 50px;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(240,180,41,0.35);
}

.btn-lg { padding: 16px 40px; font-size: 1.1rem; }

/* ====================================
   NAVIGATION
   ==================================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--color-accent);
  
  
  border-bottom: 1px solid rgba(0,0,0,0.06);
  height: var(--nav-height);
  transition: var(--transition);
}

.nav.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.06); }

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon { width: 38px; height: 38px; flex-shrink: 0; }

.logo-text { display: flex; flex-direction: column; }
.logo-title { font-size: 1.27rem; font-weight: 800; color: var(--color-primary); line-height: 1.2; }
.logo-sub { font-size: 0.7rem; color: var(--color-primary); font-weight: 500; opacity: 0.75; letter-spacing: 0.02em; }

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  font-size: 0.93rem;
  font-weight: 500;
  color: var(--color-primary);
  transition: var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-blue);
  transition: var(--transition);
}

.nav-links a:hover { color: var(--color-primary); }
.nav-links a:hover::after { width: 100%; }

.nav-cta {
  background: var(--color-primary) !important;
  color: white !important;
  padding: 8px 22px !important;
  border-radius: 50px;
  font-weight: 600 !important;
}
.nav-cta::after { display: none !important; }
.nav-cta:hover { background: var(--color-primary-light) !important; transform: translateY(-1px); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--color-accent); border-radius: 2px; transition: var(--transition); }

/* ====================================
   HERO
   ==================================== */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(135deg, var(--color-primary) 0%, #132d5e 50%, #0f274d 100%);
  color: white;
  position: relative;
  overflow: hidden;
  min-height: 90vh;
  display: flex;
  align-items: center;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(59,130,246,0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(240,180,41,0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(59,130,246,0.08) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  background: rgba(240,180,41,0.12);
  padding: 6px 16px;
  border-radius: 50px;
  margin-bottom: 24px;
}

.hero-text h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.15;
  margin-bottom: 20px;
  font-weight: 800;
}

.hero-sub {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.7);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 500px;
}

/* Hero cards */
.hero-visual {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero-card {
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 76px;
  transition: var(--transition);
}

.hero-card:hover {
  background: rgba(255,255,255,0.14);
  transform: translateX(6px);
}

.hero-card-icon { flex-shrink: 0; display: flex; align-items: center; justify-content: center; width: 44px; height: 44px; }
.hero-card-icon svg { display: block; width: 36px; height: 36px; }

.hero-card-text { display: flex; flex-direction: column; gap: 2px; }

.hero-card h3 {
  font-size: 0.95rem;
  margin-bottom: 0;
}

.hero-card p {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: 0;
}

/* Wave divider */
.hero-wave {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  line-height: 0;
  pointer-events: none;
}
.hero-wave svg { display: block; width: 100%; height: 60px; }

/* ====================================
   ABOUT
   ==================================== */
.about {
  padding: 50px 0;
  background: var(--color-bg);
}

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

.about-text p {
  margin-bottom: 16px;
  color: var(--color-primary); font-weight: 500; opacity: 0.75;
  font-size: 1rem;
}

.about-stats {
  display: flex;
  gap: 24px;
  margin-top: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--color-primary); font-weight: 500; opacity: 0.75;
  margin-top: 4px;
}

/* About Features */
.about-features {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.about-feature {
  display: flex;
  gap: 30px;
  padding: 20px;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  transition: var(--transition);
}

.about-feature:hover {
  background: white;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
  transform: translateX(4px);
}

.feature-icon { font-size: 1.6rem; flex-shrink: 0; margin-top: 2px; }
.about-feature h4 { font-size: 0.95rem; margin-bottom: 4px; color: var(--color-primary); }
.about-feature p { font-size: 0.85rem; color: var(--color-primary); font-weight: 500; opacity: 0.75; line-height: 1.5; }

/* ====================================
   WHY
   ==================================== */
.why {
  padding: 50px 0;
  background: var(--color-bg-alt);
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.why-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  transition: var(--transition);
  border: 1px solid var(--color-border);
  text-align: center;
}

.why-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.06);
  border-color: transparent;
}

.why-icon { font-size: 2.5rem; margin-bottom: 20px; }
.why-card h3 { font-size: 1.2rem; margin-bottom: 12px; color: var(--color-primary); }
.why-card p { font-size: 0.9rem; color: var(--color-primary); font-weight: 500; opacity: 0.75; line-height: 1.6; }

/* ====================================
   HOW IT WORKS
   ==================================== */
.how {
  padding: 50px 0;
  background: var(--color-bg);
}

.steps {
  display: flex;
  gap: 40px;
  position: relative;
}

.step {
  flex: 1;
  position: relative;
  padding: 32px 24px;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  transition: var(--transition);
}

.step:hover { transform: translateY(-4px); box-shadow: 0 8px 30px rgba(0,0,0,0.05); }

.step-num {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-blue);
  opacity: 0.2;
  line-height: 1;
  margin-bottom: 12px;
}

.step h3 { font-size: 1.1rem; margin-bottom: 8px; color: var(--color-primary); }
.step p { font-size: 0.88rem; color: var(--color-text-light); line-height: 1.6; }

.step-line {
  display: none;
}

/* ====================================
   AUDIENCE / FOR WHOM
   ==================================== */
.audience {
  padding: 50px 0;
  background: var(--color-bg-alt);
}

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

.audience-desc {
  color: var(--color-primary); font-weight: 500; opacity: 0.75;
  margin-bottom: 24px;
  font-size: 1rem;
}

.audience-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.audience-list li {
  padding: 12px 16px 12px 36px;
  background: white;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  color: var(--color-primary);
  position: relative;
  border: 1px solid var(--color-border);
}

.audience-list li::before {
  content: '✓';
  position: absolute;
  left: 14px;
  color: var(--color-blue);
  font-weight: 700;
}

.audience-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.audience-card {
  padding: 16px 20px;
  background: white;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  transition: var(--transition);
}

.audience-card:hover { transform: translateX(6px); box-shadow: 0 4px 20px rgba(0,0,0,0.04); }

.accent-flag { font-size: 2rem; display: block; margin-bottom: 8px; }
.audience-card h4 { font-size: 1rem; color: var(--color-primary); margin-bottom: 4px; }
.audience-card p { font-size: 0.78rem; color: var(--color-text-light); line-height: 1.4; }

/* ====================================
   CTA
   ==================================== */
.cta {
  padding: 40px 0 50px;
  background: var(--color-bg);
}

.cta-box {
  background: linear-gradient(135deg, var(--color-primary) 0%, #132d5e 100%);
  border-radius: var(--radius-lg);
  padding: 64px 48px;
  text-align: center;
  color: white;
}

.cta-content h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin-bottom: 16px;
}

.cta-content p {
  color: rgba(255,255,255,0.7);
  max-width: 500px;
  margin: 0 auto 32px;
  font-size: 1rem;
}

.cta-small {
  font-size: 0.82rem !important;
  opacity: 0.5;
  margin-top: 16px !important;
}

/* ====================================
   FOOTER
   ==================================== */
footer {
  background: var(--color-bg-dark);
  color: rgba(255,255,255,0.6);
  padding: 24px 0;
  font-size: 0.82rem;
  text-align: center;
}

footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

footer a { color: rgba(255,255,255,0.8); }
footer a:hover { color: white; }

/* ====================================
   RESPONSIVE
   ==================================== */
@media (max-width: 900px) {
  .hero-content,
  .about-grid,
  .why-grid,
  .audience-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero {
    min-height: auto;
    padding: 50px 0 20px;
    padding: 50px 0 20px;
  }

  .hero-text h1 { font-size: 2rem; }


  .steps { flex-direction: column; gap: 20px; }

  .hero-wave svg { height: 40px; }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-accent);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    transform: translateY(-120%);
    transition: var(--transition);
    border-bottom: 1px solid rgba(0,0,0,0.08);
  }
  .nav-links a {
    color: var(--color-primary) !important;
  }
  .nav-links a:hover {
    color: var(--color-primary-light) !important;
  }
  .nav-links a::after {
    background: var(--color-primary) !important;
  }
  .nav-cta {
    background: var(--color-primary) !important;
    color: white !important;
  }

  .nav-links.open { transform: translateY(0); }

  .nav-toggle { display: flex; }

  .about-stats { flex-direction: column; gap: 16px; }

  .cta-box { padding: 40px 24px; border-radius: 0; margin: 0 -24px; }

  footer .container { flex-direction: column; gap: 8px; }
}