/* =============================================
   EDUVAL — CSS Design System
   Bay Area EdTech · Syne + DM Sans
   ============================================= */

:root {
  --navy:       #0A1628;
  --navy-mid:   #0F2044;
  --indigo:     #4F46E5;
  --indigo-light: #6D65F0;
  --amber:      #F59E0B;
  --amber-light: #FCD34D;
  --white:      #FFFFFF;
  --slate-bg:   #F8FAFF;
  --slate-mid:  #E8EEFF;
  --text-dark:  #0D1B2A;
  --text-mid:   #3A4A5C;
  --text-light: #6B7A8D;
  --border:     #DDE3EE;

  --mahaexam-red: #E02020;
  --deeper-blue:  #0057B8;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;

  --shadow-sm: 0 2px 8px rgba(10,22,40,0.08);
  --shadow-md: 0 8px 32px rgba(10,22,40,0.12);
  --shadow-lg: 0 24px 64px rgba(10,22,40,0.16);

  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---- RESET ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'DM Sans', sans-serif;
  color: var(--text-dark);
  background: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
address { font-style: normal; }
ul { list-style: none; }

/* ---- TYPOGRAPHY ---- */
h1, h2, h3, h4, h5 {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  line-height: 1.15;
}
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); font-weight: 800; }
h2 { font-size: clamp(1.7rem, 3.5vw, 2.8rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.8rem); }
h4 { font-size: 1.05rem; font-weight: 600; }
p  { color: var(--text-mid); line-height: 1.7; }
em { font-style: normal; color: var(--amber); }

/* ---- LAYOUT ---- */
.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 13px 28px;
  border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--indigo);
  color: var(--white);
  border-color: var(--indigo);
}
.btn-primary:hover {
  background: var(--indigo-light);
  border-color: var(--indigo-light);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(79,70,229,0.35);
}
.btn-outline {
  background: transparent;
  color: var(--indigo);
  border-color: var(--indigo);
}
.btn-outline:hover {
  background: var(--indigo);
  color: var(--white);
  transform: translateY(-1px);
}
.btn-white {
  background: var(--white);
  color: var(--navy);
  border-color: var(--white);
}
.btn-white:hover {
  background: var(--amber-light);
  border-color: var(--amber-light);
  transform: translateY(-1px);
}
.btn-full { width: 100%; justify-content: center; }

/* ---- NAVBAR ---- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(10, 22, 40, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: background var(--transition), box-shadow var(--transition);
}
.navbar.scrolled {
  background: rgba(10, 22, 40, 0.98);
  box-shadow: var(--shadow-md);
}
.nav-container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: 'Syne', sans-serif;
  font-size: 1.55rem;
  font-weight: 800;
  text-decoration: none;
}
.logo-edu { color: var(--white); }
.logo-val { color: var(--amber); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-links a {
  color: rgba(255,255,255,0.75);
  font-size: 0.92rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--white);
  background: rgba(255,255,255,0.08);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: all var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- HERO CAROUSEL ---- */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  overflow: hidden;
}
.hero-slides { position: relative; width: 100%; height: 100%; }

.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.8s ease;
  pointer-events: none;
}
.slide.active {
  opacity: 1;
  pointer-events: all;
}
.slide-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transform: scale(1.05);
  transition: transform 6s ease;
}
.slide.active .slide-bg { transform: scale(1); }

.slide-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(10,22,40,0.82) 0%,
    rgba(10,22,40,0.55) 60%,
    rgba(79,70,229,0.2) 100%
  );
}
.slide-content {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 140px 48px 120px;
  max-width: 720px;
}
.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 16px;
  padding: 6px 14px;
  background: rgba(245,158,11,0.12);
  border-radius: 100px;
  border: 1px solid rgba(245,158,11,0.25);
  width: fit-content;
}
.slide-content h1 {
  color: var(--white);
  margin-bottom: 20px;
  text-shadow: 0 2px 12px rgba(0,0,0,0.3);
}
.slide-content p {
  color: rgba(255,255,255,0.8);
  font-size: 1.05rem;
  max-width: 520px;
  margin-bottom: 32px;
}

/* Carousel controls */
.carousel-controls {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 10;
}
.dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.35);
  border: 2px solid rgba(255,255,255,0.5);
  cursor: pointer;
  transition: all var(--transition);
  padding: 0;
}
.dot.active {
  background: var(--amber);
  border-color: var(--amber);
  width: 28px;
  border-radius: 5px;
}
.carousel-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.2);
  color: var(--white);
  width: 48px; height: 48px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.2rem;
  z-index: 10;
  transition: background var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}
.carousel-arrow:hover { background: rgba(255,255,255,0.22); }
.carousel-arrow.prev { left: 24px; }
.carousel-arrow.next { right: 24px; }

/* ---- ABOUT STRIP ---- */
.about-strip {
  background: var(--navy);
  padding: 40px 0;
}
.strip-grid {
  display: flex;
  align-items: center;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 24px;
}
.strip-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.strip-num {
  font-family: 'Syne', sans-serif;
  font-size: 2rem;
  font-weight: 800;
  color: var(--amber);
}
.strip-label {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.65);
  text-align: center;
  max-width: 120px;
}
.strip-divider {
  width: 1px;
  height: 48px;
  background: rgba(255,255,255,0.12);
}

/* ---- SECTION COMMON ---- */
.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 56px;
}
.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--indigo);
  margin-bottom: 12px;
  padding: 5px 12px;
  background: var(--slate-mid);
  border-radius: 100px;
}
.section-header h2 { margin-bottom: 16px; }
.section-header p { font-size: 1.05rem; }

/* ---- PRODUCTS PREVIEW ---- */
.products-preview {
  padding: 96px 0;
  background: var(--slate-bg);
}
.product-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}
.product-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 36px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.card-accent {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
}
.mahaexam-accent { background: linear-gradient(90deg, var(--mahaexam-red), #FF6B6B); }
.deeper-accent   { background: linear-gradient(90deg, var(--deeper-blue), var(--indigo)); }

.card-logo-wrap {
  width: 180px;
  margin-bottom: 20px;
  background: #f5f5f5;
  border-radius: var(--radius-sm);
  padding: 12px 16px;
}
.deeper-logo-wrap { background: #f0f4f8; }
.card-logo { object-fit: contain; max-height: 56px; }

.card-tag {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--indigo);
  margin-bottom: 10px;
}
.product-card h3 { margin-bottom: 12px; }
.product-card > p { margin-bottom: 24px; font-size: 0.95rem; }

.card-features { margin-bottom: 28px; display: flex; flex-direction: column; gap: 8px; }
.card-features li { display: flex; align-items: flex-start; gap: 8px; font-size: 0.9rem; color: var(--text-mid); }
.check { color: var(--indigo); font-weight: 700; flex-shrink: 0; }

/* ---- WHY SECTION ---- */
.why-section { padding: 96px 0; }
.why-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: center;
}
.why-text .section-tag { display: block; margin-bottom: 16px; }
.why-text h2 { margin-bottom: 20px; }
.why-text p { margin-bottom: 16px; }

.why-pillars { display: flex; flex-direction: column; gap: 20px; }
.pillar {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 24px;
  background: var(--slate-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.pillar:hover { border-color: var(--indigo); box-shadow: 0 4px 20px rgba(79,70,229,0.08); }
.pillar-icon { font-size: 1.4rem; flex-shrink: 0; }
.pillar h4 { margin-bottom: 4px; }
.pillar p { font-size: 0.88rem; margin: 0; }

/* ---- CTA BANNER ---- */
.cta-banner {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 50%, #1a2a6c 100%);
  padding: 80px 0;
  text-align: center;
}
.cta-banner h2 { color: var(--white); margin-bottom: 16px; }
.cta-banner p  { color: rgba(255,255,255,0.7); font-size: 1.05rem; margin-bottom: 32px; }

/* ---- PAGE HERO ---- */
.page-hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 70%, #1a2a6c 100%);
  padding: 140px 0 80px;
  text-align: center;
}
.page-hero .eyebrow { display: inline-block; margin-bottom: 16px; }
.page-hero h1 { color: var(--white); margin-bottom: 16px; }
.page-hero p  { color: rgba(255,255,255,0.75); font-size: 1.1rem; max-width: 560px; margin: 0 auto; }

/* ---- PRODUCT DETAIL ---- */
.product-detail { padding: 96px 0; background: var(--white); }
.deeper-detail  { background: var(--slate-bg); }
.product-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
}

.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 64px;
  align-items: start;
}
.detail-grid-reverse { grid-template-columns: 1.5fr 1fr; }

.detail-visual {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}
.detail-logo {
  width: 240px;
  object-fit: contain;
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 20px 28px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}
.detail-stat-cluster { display: flex; flex-direction: column; gap: 12px; width: 100%; }
.d-stat {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 24px;
  box-shadow: var(--shadow-sm);
}
.d-num {
  font-family: 'Syne', sans-serif;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--indigo);
}
.d-lbl { font-size: 0.82rem; color: var(--text-light); font-weight: 500; }

.detail-content .card-tag { margin-bottom: 12px; }
.detail-content h2 { margin-bottom: 16px; }
.detail-lead {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-dark);
  margin-bottom: 16px;
  line-height: 1.6;
}
.detail-content > p { margin-bottom: 36px; }

.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 36px;
}
.feature-item { display: flex; gap: 12px; align-items: flex-start; }
.f-icon { font-size: 1.3rem; flex-shrink: 0; }
.feature-item h4 { margin-bottom: 4px; font-size: 0.92rem; }
.feature-item p  { font-size: 0.83rem; margin: 0; }

.deeper-tag { color: var(--deeper-blue); background: rgba(0,87,184,0.08); }
.deeper-sup { font-size: 1rem; vertical-align: super; }
.deeper-btn { background: var(--deeper-blue); border-color: var(--deeper-blue); }
.deeper-btn:hover { background: #0068d9; border-color: #0068d9; }

/* ---- CONTACT ---- */
.contact-section { padding: 80px 0; background: var(--slate-bg); }
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 48px;
  align-items: start;
}
.contact-info h3 { margin-bottom: 28px; }
.info-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 24px;
}
.info-icon { font-size: 1.3rem; flex-shrink: 0; }
.info-item h4 { font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-light); margin-bottom: 4px; }
.info-item a { color: var(--indigo); font-weight: 500; }
.info-item a:hover { text-decoration: underline; }
.info-item address, .info-item p { font-size: 0.93rem; color: var(--text-mid); }

.contact-products { margin-top: 32px; }
.contact-products h4 { font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-light); margin-bottom: 14px; }
.mini-product-links { display: flex; gap: 12px; flex-wrap: wrap; }
.mini-product {
  padding: 10px 16px;
  background: var(--white);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: box-shadow var(--transition), transform var(--transition);
}
.mini-product:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.mini-product img { height: 36px; width: auto; object-fit: contain; }

.form-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 40px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
}
.form-card h3 { margin-bottom: 6px; }
.form-card > p { font-size: 0.92rem; margin-bottom: 28px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: 18px; }
.form-group label { font-size: 0.88rem; font-weight: 600; color: var(--text-dark); }
.req { color: var(--mahaexam-red); }

.form-group input,
.form-group select,
.form-group textarea {
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.93rem;
  color: var(--text-dark);
  background: var(--white);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  width: 100%;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--indigo);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-group select { cursor: pointer; }
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-light); }

.form-success, .form-error {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  margin-top: 16px;
  font-size: 0.9rem;
  font-weight: 500;
}
.form-success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.form-error   { background: #fef2f2; color: #991b1b; border: 1px solid #fca5a5; }
.form-error a { color: var(--mahaexam-red); text-decoration: underline; }

/* ---- FOOTER ---- */
.footer { background: var(--navy); padding: 64px 0 0; }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand .nav-logo { margin-bottom: 12px; display: inline-block; }
.footer-brand p {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.55);
  max-width: 260px;
  margin-bottom: 12px;
}
.footer-email a { color: var(--amber); font-size: 0.9rem; font-weight: 500; }
.footer-email a:hover { text-decoration: underline; }

.footer-links-col h5 {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 16px;
}
.footer-links-col ul { display: flex; flex-direction: column; gap: 8px; }
.footer-links-col li a { font-size: 0.88rem; color: rgba(255,255,255,0.65); transition: color var(--transition); }
.footer-links-col li a:hover { color: var(--white); }
.footer-links-col address { font-size: 0.85rem; color: rgba(255,255,255,0.55); line-height: 1.7; }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-bottom p { font-size: 0.8rem; color: rgba(255,255,255,0.35); }

/* ---- RESPONSIVE ---- */
@media (max-width: 900px) {
  .hamburger { display: flex; }

  .nav-links {
    position: fixed;
    top: 68px; right: 0;
    width: min(300px, 100vw);
    height: calc(100vh - 68px);
    background: var(--navy);
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
    gap: 4px;
    transform: translateX(100%);
    transition: transform var(--transition);
    border-left: 1px solid rgba(255,255,255,0.08);
    z-index: 999;
  }
  .nav-links.open { transform: translateX(0); }
  .nav-links a { padding: 12px 16px; width: 100%; font-size: 1rem; }

  .slide-content { padding: 120px 24px 100px; }
  .carousel-arrow { display: none; }

  .strip-divider { display: none; }
  .strip-grid { gap: 32px 16px; justify-content: center; }

  .product-cards { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; gap: 48px; }

  .detail-grid,
  .detail-grid-reverse { grid-template-columns: 1fr; }
  .detail-grid-reverse .detail-content { order: -1; }

  .feature-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 560px) {
  .slide-content h1 { font-size: 1.9rem; }
  .products-preview, .why-section, .product-detail { padding: 64px 0; }
  .cta-banner { padding: 56px 0; }
  .page-hero { padding: 110px 0 60px; }
  .footer-grid { grid-template-columns: 1fr; }
  .form-card { padding: 28px 20px; }
  .detail-logo { width: 180px; }
}

@media (prefers-reduced-motion: reduce) {
  .slide, .slide-bg, .btn, .pillar, .product-card { transition: none !important; }
}