/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #E87511;
  --secondary: #F4A524;
  --dark: #C25E0A;
  --text: #1a1a1a;
  --text-light: #555;
  --bg: #ffffff;
  --bg-light: #faf7f2;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.07);
  --shadow-hover: 0 12px 40px rgba(232, 117, 17, 0.15);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: 'Poppins', sans-serif;
  line-height: 1.2;
}

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

ul {
  list-style: none;
}

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== REVEAL ANIMATION ===== */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== NAVBAR ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  transition: box-shadow var(--transition);
}

.navbar.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.nav-logo {
  font-family: 'Poppins', sans-serif;
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--primary);
  white-space: nowrap;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-links a {
  font-size: 0.88rem;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  color: var(--text-light);
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  background: rgba(232, 117, 17, 0.08);
}

.nav-login-btn {
  font-size: 0.88rem;
  font-weight: 600;
  padding: 9px 24px;
  border-radius: 50px;
  background: var(--primary);
  color: #fff;
  transition: background var(--transition), transform var(--transition);
  white-space: nowrap;
}

.nav-login-btn:hover {
  background: var(--dark);
  transform: translateY(-1px);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2.5px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger.open span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
}

.hamburger.open span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 50%, var(--dark) 100%);
  overflow: hidden;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.12) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.08) 0%, transparent 50%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 680px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero p {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: rgba(255, 255, 255, 0.9);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ===== FILTER ===== */
.filter-section {
  padding: 48px 0 16px;
  background: var(--bg);
}

.filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.filter-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-btn {
  font-family: 'Inter', sans-serif;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 10px 22px;
  border: 2px solid #e8e8e8;
  border-radius: 50px;
  background: var(--bg);
  color: var(--text-light);
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.filter-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.search-box {
  position: relative;
  min-width: 260px;
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: #999;
  pointer-events: none;
}

.search-box input {
  width: 100%;
  font-family: 'Inter', sans-serif;
  font-size: 0.92rem;
  padding: 11px 16px 11px 42px;
  border: 2px solid #e8e8e8;
  border-radius: 50px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  background: var(--bg);
  color: var(--text);
}

.search-box input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(232, 117, 17, 0.1);
}

/* ===== TEACHERS GRID ===== */
.teachers-section {
  padding: 32px 0 80px;
}

.teachers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 28px;
}

.teacher-card {
  background: var(--bg);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--radius);
  padding: 36px 28px 28px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.teacher-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.teacher-card.hidden {
  display: none;
}

.avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  font-size: 1.4rem;
  color: #fff;
  box-shadow: 0 4px 16px rgba(232, 117, 17, 0.25);
}

.teacher-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
}

.department {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--primary);
  background: rgba(232, 117, 17, 0.08);
  padding: 4px 14px;
  border-radius: 50px;
  margin-bottom: 8px;
}

.experience {
  display: block;
  font-size: 0.82rem;
  color: var(--text-light);
  margin-bottom: 12px;
}

.bio {
  font-size: 0.88rem;
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 20px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.profile-btn {
  font-family: 'Inter', sans-serif;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 10px 28px;
  border: 2px solid var(--primary);
  border-radius: 50px;
  background: transparent;
  color: var(--primary);
  cursor: pointer;
  transition: all var(--transition);
}

.profile-btn:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-1px);
}

.no-results {
  display: none;
  text-align: center;
  font-size: 1.05rem;
  color: var(--text-light);
  padding: 60px 0;
}

.no-results.show {
  display: block;
}

/* ===== WHY SECTION ===== */
.why-section {
  padding: 80px 0;
  background: var(--bg-light);
}

.section-title {
  text-align: center;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 48px;
  color: var(--text);
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 28px;
}

.why-card {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.why-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.why-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(232, 117, 17, 0.1);
  border-radius: 50%;
}

.why-icon svg {
  width: 28px;
  height: 28px;
  color: var(--primary);
}

.why-card h3 {
  font-size: 1.08rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}

.why-card p {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.65;
}

/* ===== SPOTLIGHT ===== */
.spotlight-section {
  padding: 80px 0;
}

.spotlight-card {
  display: flex;
  align-items: flex-start;
  gap: 48px;
  background: var(--bg);
  border-radius: var(--radius);
  padding: 48px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.spotlight-avatar {
  width: 140px;
  height: 140px;
  min-width: 140px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  font-size: 2.6rem;
  color: #fff;
  box-shadow: 0 8px 32px rgba(232, 117, 17, 0.3);
}

.spotlight-info h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.spotlight-role {
  display: inline-block;
  font-size: 0.92rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 16px;
}

.spotlight-info p {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 24px;
}

.spotlight-info blockquote {
  position: relative;
  padding: 20px 24px 20px 28px;
  background: var(--bg-light);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.95rem;
  font-style: italic;
  color: var(--text);
  line-height: 1.65;
}

.quote-icon {
  position: absolute;
  top: -12px;
  left: 12px;
  width: 28px;
  height: 28px;
  color: var(--secondary);
  opacity: 0.5;
}

/* ===== CTA ===== */
.cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--primary), var(--dark));
  text-align: center;
  color: #fff;
}

.cta-section h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-section > .container > p {
  max-width: 640px;
  margin: 0 auto 28px;
  font-size: 1rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.9);
}

.cta-requirements {
  display: inline-block;
  text-align: left;
  margin-bottom: 32px;
}

.cta-requirements li {
  position: relative;
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.88);
  padding-left: 24px;
  margin-bottom: 8px;
  line-height: 1.6;
}

.cta-requirements li::before {
  content: '✓';
  position: absolute;
  left: 0;
  font-weight: 700;
  color: var(--secondary);
}

.cta-btn {
  display: inline-block;
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  padding: 14px 40px;
  border-radius: 50px;
  background: #fff;
  color: var(--primary);
  transition: transform var(--transition), box-shadow var(--transition);
}

.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.2);
}

/* ===== FOOTER ===== */
.footer {
  background: #1a1a1a;
  color: #ccc;
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-col h4 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.footer-col p {
  font-size: 0.88rem;
  line-height: 1.7;
  color: #999;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul a {
  font-size: 0.88rem;
  color: #999;
  transition: color var(--transition);
}

.footer-col ul a:hover {
  color: var(--secondary);
}

.social-links {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}

.social-links a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  transition: background var(--transition), transform var(--transition);
}

.social-links a:hover {
  background: var(--primary);
  transform: translateY(-2px);
}

.social-links svg {
  width: 18px;
  height: 18px;
  color: #ccc;
}

.social-links a:hover svg {
  color: #fff;
}

.footer-email {
  font-size: 0.88rem;
  color: #999;
}

.footer-bottom {
  text-align: center;
  padding: 24px 0;
  font-size: 0.82rem;
  color: #666;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 992px) {
  .spotlight-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 36px 28px;
  }

  .spotlight-info blockquote {
    text-align: left;
  }
}

@media (max-width: 768px) {
  .nav-links,
  .nav-login-btn {
    display: none;
  }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: #fff;
    padding: 16px 24px 24px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
    border-radius: 0 0 var(--radius) var(--radius);
    gap: 4px;
    animation: slideDown 0.3s ease;
  }

  .nav-links.open + .nav-login-btn {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .filter-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .search-box {
    min-width: 100%;
  }

  .hero {
    min-height: 300px;
    padding: 100px 20px 60px;
  }

  .teachers-grid {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
}

@media (max-width: 520px) {
  .teachers-grid {
    grid-template-columns: 1fr;
  }

  .spotlight-avatar {
    width: 100px;
    height: 100px;
    min-width: 100px;
    font-size: 2rem;
  }

  .filter-buttons {
    justify-content: center;
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}