:root {
  --color-primary: #0f6b6f;
  --color-primary-dark: #0a5053;
  --color-primary-rgb: 15, 107, 111;
  --color-bg: #f8f9fb;
  --color-text: #0c1b1f;
  --color-muted: #4a5b63;
  --color-card: #ffffff;
  --color-border: #e2e8ee;
  --shadow-sm: 0 8px 24px rgba(15, 107, 111, 0.12);
  --shadow-md: 0 18px 40px rgba(15, 107, 111, 0.16);
}

:root[data-theme="dark"] {
  --color-primary: #0f6b6f;
  --color-primary-dark: #66d2d6;
  --color-primary-rgb: 15, 107, 111;
  --color-bg: #0b1317;
  --color-text: #e6eef1;
  --color-muted: #b1c0c6;
  --color-card: #111c21;
  --color-border: #1f2e36;
  --shadow-sm: 0 10px 26px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 18px 40px rgba(0, 0, 0, 0.45);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Poppins", sans-serif;
  color: var(--color-text);
  background: radial-gradient(circle at top, rgba(var(--color-primary-rgb), 0.08), transparent 45%),
    linear-gradient(180deg, #ffffff 0%, var(--color-bg) 100%);
  min-height: 100vh;
  line-height: 1.6;
}

:root[data-theme="dark"] body {
  background: radial-gradient(circle at top, rgba(var(--color-primary-rgb), 0.18), transparent 55%),
    linear-gradient(180deg, #071015 0%, var(--color-bg) 100%);
}

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

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

ul {
  list-style: none;
}

button {
  font-family: inherit;
}

/* Layout */
.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.section {
  padding: 80px 0;
}

.section-title {
  font-size: clamp(1.6rem, 2.5vw, 2.4rem);
  margin-bottom: 18px;
  color: var(--color-primary-dark);
}

.section-lead {
  color: var(--color-muted);
  max-width: 720px;
  margin-bottom: 32px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(226, 232, 238, 0.8);
}

:root[data-theme="dark"] .site-header {
  background: rgba(11, 19, 23, 0.9);
  border-bottom: 1px solid rgba(31, 46, 54, 0.9);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand img {
  width: 120px;
  height: auto;
}

.nav-links {
  display: flex;
  gap: 22px;
  font-weight: 500;
  color: var(--color-muted);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: var(--color-card);
  color: var(--color-muted);
  font-weight: 600;
  cursor: pointer;
  transition: border 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.theme-toggle:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

.nav-links a {
  position: relative;
  padding-bottom: 4px;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a:focus::after {
  width: 100%;
}

/* Hero */
.hero {
  padding: 110px 0 90px;
}

.hero-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  align-items: center;
  gap: 48px;
}

.hero-title {
  font-size: clamp(2.4rem, 3.4vw, 3.8rem);
  line-height: 1.15;
  margin-bottom: 20px;
  color: var(--color-primary-dark);
}

.hero-text {
  font-size: 1.05rem;
  color: var(--color-muted);
  margin-bottom: 28px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 26px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  position: relative;
}

.btn.is-loading {
  color: transparent;
  pointer-events: none;
}

.btn.is-loading::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-top-color: #ffffff;
  animation: spin 0.8s linear infinite;
}

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

.btn-primary {
  background: var(--color-primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}

.btn-outline:hover {
  background: rgba(15, 107, 111, 0.08);
}

.hero-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  padding: 26px;
  border-radius: 24px;
  box-shadow: var(--shadow-sm);
}

.hero-card ul {
  display: grid;
  gap: 14px;
  color: var(--color-muted);
}

.hero-card li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.hero-card svg {
  flex-shrink: 0;
  margin-top: 4px;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 28px;
}

.info-card {
  background: var(--color-card);
  border-radius: 18px;
  padding: 22px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.info-card h3 {
  margin-bottom: 10px;
  color: var(--color-primary-dark);
}

/* Course cards */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.card {
  background: var(--color-card);
  border-radius: 20px;
  padding: 22px;
  border: 1px solid var(--color-border);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.card-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: rgba(var(--color-primary-rgb), 0.12);
  margin-bottom: 14px;
}

.card h3 {
  margin-bottom: 10px;
  font-size: 1.05rem;
  color: var(--color-primary-dark);
}

.card p {
  color: var(--color-muted);
}

/* Why Choose */
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.check-item {
  background: var(--color-card);
  border-radius: 16px;
  padding: 18px;
  border: 1px solid var(--color-border);
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.check-item svg {
  flex-shrink: 0;
  margin-top: 4px;
}

/* Team */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.team-item {
  padding: 18px;
  border-radius: 16px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  text-align: center;
  font-weight: 600;
  color: var(--color-primary-dark);
}

/* Timeline */
.timeline {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  gap: 24px;
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 18px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-border);
}

.timeline-item {
  padding: 24px;
  background: var(--color-card);
  border-radius: 18px;
  border: 1px solid var(--color-border);
  position: relative;
}

.timeline-item::before {
  content: "";
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-primary);
  position: absolute;
  top: -7px;
  left: 24px;
  box-shadow: 0 0 0 6px rgba(15, 107, 111, 0.15);
}

.timeline-item h3 {
  margin-bottom: 8px;
  color: var(--color-primary-dark);
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.contact-card {
  padding: 24px;
  border-radius: 18px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
}

.contact-details {
  display: grid;
  gap: 12px;
  color: var(--color-muted);
}

.contact-details strong {
  color: var(--color-primary-dark);
}

.map-embed {
  margin-top: 14px;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.map-embed iframe {
  width: 100%;
  height: 320px;
  border: 0;
  display: block;
}

.form-group {
  display: grid;
  gap: 8px;
  margin-bottom: 16px;
}

[data-university-other][hidden] {
  display: none;
}

.checkbox-dropdown {
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-card);
  padding: 10px 12px;
}

.checkbox-dropdown summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--color-primary-dark);
  list-style: none;
}

.checkbox-dropdown summary::-webkit-details-marker {
  display: none;
}

.checkbox-list {
  display: grid;
  gap: 10px;
  margin-top: 12px;
  color: var(--color-muted);
}

.checkbox-list label {
  display: flex;
  align-items: center;
  gap: 10px;
}

.checkbox-list input[type="checkbox"] {
  width: 16px;
  height: 16px;
}

.radio-dropdown {
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-card);
  padding: 10px 12px;
}

.radio-dropdown summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--color-primary-dark);
  list-style: none;
}

.radio-dropdown summary::-webkit-details-marker {
  display: none;
}

.radio-list {
  display: grid;
  gap: 10px;
  margin-top: 12px;
  color: var(--color-muted);
}

.radio-list label {
  display: flex;
  align-items: center;
  gap: 10px;
}

.radio-list input[type="radio"] {
  width: 16px;
  height: 16px;
}

.radio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px 16px;
  color: var(--color-muted);
}

.radio-grid label {
  display: flex;
  align-items: center;
  gap: 10px;
}

.radio-grid input[type="radio"] {
  width: 16px;
  height: 16px;
}

.category-hint {
  font-size: 0.9rem;
  color: var(--color-muted);
  margin-top: 8px;
}

input,
textarea,
select {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--color-border);
  background: var(--color-card);
  font-family: inherit;
}

textarea {
  min-height: 130px;
  resize: vertical;
}

.social-links {
  display: flex;
  gap: 14px;
  margin-top: 16px;
  font-weight: 600;
  color: var(--color-primary);
}

/* Footer */
.site-footer {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-card);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  align-items: start;
}

.footer-brand p {
  color: var(--color-muted);
  margin-top: 12px;
}

.footer-links {
  display: grid;
  gap: 10px;
  color: var(--color-muted);
}

.footer-bottom {
  margin-top: 26px;
  color: var(--color-muted);
  text-align: center;
  font-size: 0.95rem;
}

/* Floating action button */
.fab-whatsapp {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: #25d366;
  display: grid;
  place-items: center;
  box-shadow: 0 14px 30px rgba(37, 211, 102, 0.35);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  z-index: 120;
}

.fab-whatsapp:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 36px rgba(37, 211, 102, 0.45);
}

/* Submission modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(7, 16, 21, 0.55);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 200;
}

.modal-overlay.is-visible {
  display: flex;
}

.modal-card {
  width: min(420px, 92%);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 26px;
  box-shadow: var(--shadow-md);
  text-align: center;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-card);
  color: var(--color-muted);
  font-size: 1.3rem;
  line-height: 1;
  cursor: pointer;
}

.modal-card h3 {
  margin-bottom: 10px;
  color: var(--color-primary-dark);
}

.modal-card p {
  color: var(--color-muted);
  margin-bottom: 18px;
}

.modal-card.is-error h3 {
  color: #b94747;
}

.modal-card.is-scrollable {
  max-height: min(80vh, 640px);
  width: min(640px, 96%);
  overflow-y: auto;
  text-align: left;
}

.modal-card.is-scrollable .section-title {
  margin-bottom: 16px;
  text-align: left;
}

/* Reveal animations */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Responsive */
@media (max-width: 900px) {
  .nav-links {
    display: none;
  }

  .nav-actions {
    margin-left: auto;
  }

  .hero {
    padding-top: 80px;
  }

  .timeline {
    grid-auto-flow: row;
  }

  .timeline::before {
    top: 0;
    left: 18px;
    bottom: 0;
    width: 2px;
    height: auto;
  }

  .timeline-item::before {
    top: 24px;
    left: -7px;
  }
}

@media (max-width: 600px) {
  .section {
    padding: 64px 0;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .brand img {
    width: 96px;
  }
}