/* ===== Variables ===== */
:root {
  --color-bg: #0c0f14;
  --color-surface: #141a24;
  --color-surface-2: #1c2433;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-text: #e8eaed;
  --color-text-muted: #9aa3b2;
  --color-accent: #ff6b35;
  --color-accent-soft: rgba(255, 107, 53, 0.15);
  --color-teal: #2dd4bf;
  --color-teal-soft: rgba(45, 212, 191, 0.12);
  --font-sans: "DM Sans", system-ui, sans-serif;
  --font-serif: "Instrument Serif", Georgia, serif;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --header-h: 72px;
  --transition: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 999px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: #ff8555;
}

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

.btn-outline:hover {
  border-color: var(--color-text-muted);
  background: var(--color-surface);
}

.btn-nav {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
}

.btn-full {
  width: 100%;
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(12, 15, 20, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.header.scrolled {
  border-color: var(--color-border);
  box-shadow: var(--shadow);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1rem;
  font-weight: 500;
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-accent), #ff9f43);
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
}

.logo strong {
  color: var(--color-accent);
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a:not(.btn) {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.nav-links a:not(.btn):hover {
  color: var(--color-text);
}

.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-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 3rem) 0 4rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 70% 20%, var(--color-accent-soft), transparent 50%),
    radial-gradient(ellipse 60% 50% at 10% 80%, var(--color-teal-soft), transparent 45%),
    var(--color-bg);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 400;
  line-height: 1.15;
  margin-bottom: 1.25rem;
}

.hero-title em {
  font-style: italic;
  color: var(--color-accent);
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 32rem;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.hero-stats {
  display: flex;
  gap: 2.5rem;
  flex-wrap: wrap;
}

.stat-num {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-teal);
}

.stat-suffix {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-teal);
}

.stat-label {
  display: block;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 0.15rem;
}

/* Hero visual cards */
.hero-visual {
  position: relative;
  min-height: 380px;
}

.hero-orb {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, var(--color-accent-soft) 0%, transparent 70%);
  border-radius: 50%;
  animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.6; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 1; transform: translate(-50%, -50%) scale(1.08); }
}

.hero-card {
  position: absolute;
  padding: 1rem 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  animation: float 5s ease-in-out infinite;
}

.hero-card-1 {
  top: 10%;
  left: 5%;
  animation-delay: 0s;
}

.hero-card-2 {
  top: 45%;
  right: 0;
  animation-delay: -1.5s;
}

.hero-card-3 {
  bottom: 8%;
  left: 15%;
  animation-delay: -3s;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.card-label {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-teal);
  margin-bottom: 0.25rem;
}

.card-title {
  font-size: 0.95rem;
  font-weight: 600;
}

/* ===== Sections ===== */
.section {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  max-width: 36rem;
  margin: 0 auto 3rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 400;
  margin-bottom: 0.75rem;
}

.section-desc {
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

/* ===== Benefits ===== */
.benefits {
  background: var(--color-surface);
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.benefit-card {
  padding: 1.75rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition), transform var(--transition);
}

.benefit-card:hover {
  border-color: rgba(255, 107, 53, 0.3);
  transform: translateY(-4px);
}

.benefit-icon {
  font-size: 1.75rem;
  margin-bottom: 1rem;
}

.benefit-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.benefit-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* ===== Curriculum ===== */
.curriculum-tabs {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.tab-btn {
  padding: 0.6rem 1.25rem;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition);
}

.tab-btn:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

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

.curriculum-panels {
  max-width: 640px;
  margin: 0 auto;
}

.curriculum-panel {
  display: none;
  animation: fadeIn 0.35s ease;
}

.curriculum-panel.active {
  display: block;
}

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

.learn-list li {
  display: flex;
  gap: 1.25rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

.learn-list li:last-child {
  border-bottom: none;
}

.learn-num {
  flex-shrink: 0;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-accent);
  opacity: 0.8;
}

.learn-list h4 {
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

.learn-list p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ===== Contact ===== */
.contact {
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-surface) 100%);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.contact-info .section-title,
.contact-info .section-desc {
  text-align: left;
}

.contact-info .section-header {
  margin: 0 0 1.5rem;
  text-align: left;
}

.contact-details {
  margin-top: 2rem;
}

.contact-details li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.contact-details a:hover {
  color: var(--color-accent);
}

.contact-icon {
  font-size: 1.1rem;
}

.contact-form {
  padding: 2rem;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.4rem;
  color: var(--color-text-muted);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: inherit;
  font-size: 0.95rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-group input.error,
.form-group select.error {
  border-color: #ef4444;
}

.form-error {
  display: block;
  font-size: 0.8rem;
  color: #ef4444;
  margin-top: 0.35rem;
  min-height: 1.2em;
}

.form-success {
  margin-top: 1rem;
  padding: 0.75rem;
  background: var(--color-teal-soft);
  border-radius: var(--radius);
  color: var(--color-teal);
  font-size: 0.9rem;
  text-align: center;
}

/* ===== Footer ===== */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo-footer .logo-icon {
  width: 28px;
  height: 28px;
  font-size: 0.9rem;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--color-text);
}

/* ===== Scroll reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-stats {
    justify-content: center;
  }

  .hero-visual {
    min-height: 300px;
    max-width: 400px;
    margin: 0 auto;
  }

  .benefits-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .contact-info .section-title,
  .contact-info .section-desc {
    text-align: center;
  }

  .contact-info .section-header {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
  }

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

  .contact-details li {
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 1rem;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition), opacity var(--transition), visibility var(--transition);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-links li {
    width: 100%;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-links li:last-child {
    border-bottom: none;
    padding-top: 0.5rem;
  }

  .nav-links a {
    display: block;
    padding: 1rem;
    text-align: center;
  }

  .nav-links .btn-nav {
    width: 100%;
  }

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

  .hero-stats {
    gap: 1.5rem;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .footer-links {
    justify-content: center;
  }
}