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

:root {
  --primary: #0033cc;
  --primary-dark: #001f8a;
  --primary-light: #e8eeff;
  --accent: #f59e0b;
  --white: #ffffff;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --blue-100: #dbeafe;
  --blue-200: #bfdbfe;
  --blue-300: #93c5fd;
  --blue-800: #1e40af;
  --green-100: #dcfce7;
  --green-200: #bbf7d0;
  --green-800: #166534;
  --green-900: #14532d;
  --purple-100: #f3e8ff;
  --purple-200: #e9d5ff;
  --purple-800: #6b21a8;
  --purple-900: #581c87;
  --radius: 0.75rem;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
    0 4px 6px -4px rgba(0, 0, 0, 0.1);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif;
  color: var(--gray-700);
  background: var(--white);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
}

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

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

ul {
  list-style: none;
}

main {
  flex: 1;
}

/* ===== Container ===== */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
}

@media (min-width: 640px) {
  .container {
    padding: 0 1.5rem;
  }
}
@media (min-width: 1024px) {
  .container {
    padding: 0 2rem;
  }
}

.container-sm {
  max-width: 896px;
  margin: 0 auto;
  padding: 0 1rem;
}

@media (min-width: 640px) {
  .container-sm {
    padding: 0 1.5rem;
  }
}

/* ===== Header ===== */
.header {
  background: var(--white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.logo img {
  height: 2.5rem;
  width: auto;
}

.desktop-nav {
  display: none;
  align-items: center;
  gap: 1.5rem;
}

@media (min-width: 1024px) {
  .desktop-nav {
    display: flex;
  }
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-600);
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--primary);
}

.nav-link.active {
  color: var(--primary);
  border-bottom: 2px solid var(--primary);
  padding-bottom: 2px;
}

.btn-primary {
  display: inline-block;
  background: var(--primary);
  color: var(--white);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  transition: background 0.2s;
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-primary-lg {
  padding: 0.75rem 2rem;
  font-size: 1rem;
}

.btn-outline {
  display: inline-block;
  border: 2px solid var(--white);
  color: var(--white);
  font-weight: 600;
  padding: 0.75rem 2rem;
  border-radius: 0.5rem;
  transition: background 0.2s;
  background: transparent;
  cursor: pointer;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
}

.btn-white {
  display: inline-block;
  background: var(--white);
  color: var(--primary);
  font-weight: 600;
  padding: 0.75rem 2rem;
  border-radius: 0.5rem;
  transition: background 0.2s;
  border: none;
  cursor: pointer;
}

.btn-white:hover {
  background: var(--blue-100);
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.875rem;
}

.lang-switcher .active-lang {
  font-weight: 600;
  color: var(--primary);
}

.lang-switcher .inactive-lang {
  color: var(--gray-500);
  transition: color 0.2s;
}

.lang-switcher .inactive-lang:hover {
  color: var(--primary);
}

.lang-switcher .sep {
  color: var(--gray-300);
}

/* Mobile Menu */
.mobile-menu-btn {
  display: block;
  background: none;
  border: none;
  padding: 0.5rem;
  color: var(--gray-600);
  cursor: pointer;
}

.mobile-menu-btn:hover {
  color: var(--primary);
}

@media (min-width: 1024px) {
  .mobile-menu-btn {
    display: none;
  }
}

.mobile-menu {
  display: none;
  border-top: 1px solid var(--gray-200);
}

.mobile-menu.open {
  display: block;
}

@media (min-width: 1024px) {
  .mobile-menu {
    display: none !important;
  }
}

.mobile-nav {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.mobile-nav .nav-link {
  padding: 0.5rem 0;
}

.mobile-nav .btn-primary {
  text-align: center;
}

.mobile-nav .lang-switcher {
  padding-top: 0.75rem;
  border-top: 1px solid var(--gray-200);
}

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  padding: 5rem 0;
  text-align: center;
}

@media (min-width: 768px) {
  .hero {
    padding: 7rem 0;
  }
}

.hero-logo {
  height: 4rem;
  width: auto;
  margin: 0 auto 1.5rem;
  filter: brightness(0) invert(1);
}

@media (min-width: 768px) {
  .hero-logo {
    height: 5rem;
  }
}

.hero h1 {
  font-size: 1.875rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

@media (min-width: 768px) {
  .hero h1 {
    font-size: 3rem;
  }
}

.hero p {
  font-size: 1.125rem;
  color: var(--blue-200);
  max-width: 42rem;
  margin: 0 auto 2rem;
}

@media (min-width: 768px) {
  .hero p {
    font-size: 1.25rem;
  }
}

.hero-buttons {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  justify-content: center;
  align-items: center;
}

@media (min-width: 640px) {
  .hero-buttons {
    flex-direction: row;
  }
}

/* ===== Page Header ===== */
.page-header {
  background: var(--primary);
  color: var(--white);
  padding: 3rem 0;
}

@media (min-width: 768px) {
  .page-header {
    padding: 4rem 0;
  }
}

.page-header h1 {
  font-size: 1.875rem;
  font-weight: 700;
}

@media (min-width: 768px) {
  .page-header h1 {
    font-size: 2.25rem;
  }
}

/* ===== Sections ===== */
.section {
  padding: 4rem 0;
}

@media (min-width: 768px) {
  .section {
    padding: 6rem 0;
  }
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 0.75rem;
}

@media (min-width: 768px) {
  .section-title {
    font-size: 1.875rem;
  }
}

.section-subtitle {
  color: var(--gray-600);
}

.text-center {
  text-align: center;
}

/* ===== Grid ===== */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-2 {
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.grid-3 {
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.grid-4 {
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===== Cards ===== */
.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--gray-200);
  padding: 1.5rem;
  transition: box-shadow 0.2s;
}

.card:hover {
  box-shadow: var(--shadow-lg);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 0.5rem;
  transition: color 0.2s;
}

a.card:hover h3 {
  color: var(--primary);
}

.card p {
  font-size: 0.875rem;
  color: var(--gray-600);
  line-height: 1.6;
}

.card-sm {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
  padding: 1.25rem;
  text-align: center;
}

.card-sm .card-icon {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.card-sm p {
  font-weight: 500;
  color: var(--gray-900);
}

/* ===== Accordion (details/summary) ===== */
.accordion {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.accordion details {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--gray-200);
  overflow: hidden;
}

.accordion summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  list-style: none;
  transition: background 0.2s;
}

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

.accordion summary:hover {
  background: var(--gray-50);
}

.accordion summary .icon {
  font-size: 1.5rem;
}

.accordion summary h3 {
  flex: 1;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--gray-900);
  margin: 0;
}

.accordion summary .count {
  font-size: 0.75rem;
  color: var(--gray-400);
  background: var(--gray-100);
  padding: 0.25rem 0.5rem;
  border-radius: 9999px;
}

.accordion summary .chevron {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--gray-400);
  transition: transform 0.2s;
}

.accordion details[open] summary .chevron {
  transform: rotate(180deg);
}

.accordion .accordion-content {
  padding: 0 1.5rem 1.25rem;
  border-top: 1px solid var(--gray-200);
  padding-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* Program Card */
.program-card {
  background: var(--gray-50);
  border-radius: 0.5rem;
  padding: 1rem;
}

.program-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.program-card h4 {
  font-weight: 500;
  color: var(--gray-900);
  font-size: 0.875rem;
}

.badge {
  flex-shrink: 0;
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--primary-light);
  color: var(--primary);
  padding: 0.25rem 0.5rem;
  border-radius: 9999px;
  white-space: nowrap;
}

.program-card p {
  font-size: 0.875rem;
  color: var(--gray-600);
  margin-top: 0.5rem;
  line-height: 1.6;
}

/* ===== Course Level Cards ===== */
.level-badge {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
}

.level-badge.a1 {
  background: var(--green-100);
  color: var(--green-800);
}
.level-badge.a2 {
  background: var(--green-200);
  color: var(--green-900);
}
.level-badge.b1 {
  background: var(--blue-100);
  color: #1e40af;
}
.level-badge.b2 {
  background: var(--blue-200);
  color: #1e3a8a;
}
.level-badge.c1 {
  background: var(--purple-100);
  color: var(--purple-800);
}
.level-badge.c2 {
  background: var(--purple-200);
  color: var(--purple-900);
}

.level-card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.level-card-header h3 {
  font-weight: 600;
  color: var(--gray-900);
}

/* ===== CTA Banner ===== */
.cta-banner {
  background: var(--primary-light);
  padding: 3rem 0;
  text-align: center;
}

.cta-banner h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 0.75rem;
}

.cta-banner p {
  color: var(--gray-600);
  margin-bottom: 1.5rem;
  max-width: 36rem;
  margin-left: auto;
  margin-right: auto;
}

/* ===== Exam Prep ===== */
.exam-prep {
  background: var(--primary-light);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.exam-prep h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 0.75rem;
}

.exam-prep p {
  color: var(--gray-600);
  margin-bottom: 1rem;
}

.exam-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.exam-tag {
  background: var(--white);
  color: var(--primary);
  font-weight: 600;
  font-size: 0.875rem;
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  box-shadow: var(--shadow-sm);
}

/* ===== Contact Section ===== */
.contact-section {
  padding: 4rem 0;
  background: var(--gray-50);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 1024px) {
  .contact-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.contact-cards {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
}

.contact-card-row {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.contact-card-row .icon {
  font-size: 1.5rem;
}

.contact-card h3 {
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 0.5rem;
}

.contact-card p {
  font-size: 0.875rem;
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: 0.5rem;
}

.contact-card p:last-child {
  margin-bottom: 0;
}

.contact-card a {
  transition: color 0.2s;
}

.contact-card a:hover {
  color: var(--primary);
}

.contact-card .label {
  font-weight: 500;
  color: var(--gray-900);
}

.contact-card .value {
  font-weight: 500;
  color: var(--gray-900);
}

.map-container {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
  height: 400px;
}

@media (min-width: 1024px) {
  .map-container {
    height: 100%;
    min-height: 400px;
  }
}

.map-container iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

/* ===== Footer ===== */
.footer {
  background: var(--primary-dark);
  color: var(--white);
}

.footer-inner {
  padding: 3rem 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.footer-logo {
  height: 2.5rem;
  width: auto;
  filter: brightness(0) invert(1);
  margin-bottom: 1rem;
}

.footer p {
  font-size: 0.875rem;
  color: var(--blue-200);
  line-height: 1.6;
}

.footer h3 {
  font-weight: 600;
  font-size: 1.125rem;
  margin-bottom: 1rem;
}

.footer ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer ul a {
  font-size: 0.875rem;
  color: var(--blue-200);
  transition: color 0.2s;
}

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

.footer ul li {
  font-size: 0.875rem;
  color: var(--blue-200);
}

.footer-bottom {
  border-top: 1px solid var(--blue-800);
  margin-top: 2rem;
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.875rem;
  color: var(--blue-300);
}

/* ===== Placeholder Notice ===== */
.placeholder-notice {
  background: var(--primary-light);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-top: 2.5rem;
}

.placeholder-notice p {
  font-size: 0.875rem;
  color: var(--gray-500);
  font-style: italic;
}

/* ===== Prose (About page) ===== */
.prose h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 1.5rem;
}

.prose p {
  color: var(--gray-600);
  line-height: 1.75;
  margin-bottom: 1.5rem;
}

/* ===== Utility ===== */
.mb-3 {
  margin-bottom: 0.75rem;
}
.mb-6 {
  margin-bottom: 1.5rem;
}
.mb-8 {
  margin-bottom: 2rem;
}
.mb-10 {
  margin-bottom: 2.5rem;
}
.mb-12 {
  margin-bottom: 3rem;
}
.mt-6 {
  margin-top: 1.5rem;
}
.gap-4 {
  gap: 1rem;
}