/* Albatross Programming Hub - Core Stylesheet */
:root {
  --primary: #0284c7;
  --primary-dark: #0369a1;
  --primary-light: #38bdf8;
  --primary-rgb: 2, 132, 199;
  --accent: #10b981;
  --accent-hover: #059669;
  --bg-dark: #0b1329;
  --bg-card: #111d40;
  --bg-light: #f8fafc;
  --bg-white: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #e2e8f0;
  --border-color: #e2e8f0;
  --border-dark: #1e293b;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, Monaco, monospace;
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-main);
  background-color: var(--bg-light);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--primary-dark);
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header & Navigation */
.site-header {
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.top-bar {
  background-color: var(--bg-dark);
  color: #94a3b8;
  font-size: 0.825rem;
  padding: 0.4rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.top-bar-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.top-bar-items {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.top-bar-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: #cbd5e1;
}

.top-bar-item a {
  color: #cbd5e1;
}

.top-bar-item a:hover {
  color: var(--primary-light);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--primary) 0%, #0369a1 100%);
  color: white;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.25rem;
  box-shadow: 0 4px 10px rgba(2, 132, 199, 0.3);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--bg-dark);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.5rem;
}

.nav-link {
  font-weight: 500;
  color: #334155;
  padding: 0.5rem 0.25rem;
  position: relative;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--primary);
  border-radius: 2px;
}

.header-cta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-main);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  text-align: center;
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.25);
}

.btn-outline {
  border-color: var(--border-color);
  color: #334155;
  background-color: #ffffff;
}

.btn-outline:hover {
  background-color: #f1f5f9;
  border-color: #cbd5e1;
  color: var(--text-main);
}

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

.btn-accent:hover {
  background-color: var(--accent-hover);
  color: #ffffff;
}

/* Notice Bar for Transparency & Ads Policy */
.policy-notice-bar {
  background: #f1f5f9;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.8rem;
  color: #475569;
  padding: 0.4rem 0;
  text-align: center;
}

.policy-notice-bar strong {
  color: #0f172a;
}

/* Hero Section */
.hero {
  background: linear-gradient(180deg, #ffffff 0%, #f0f7ff 100%);
  padding: 4.5rem 0 4rem;
  border-bottom: 1px solid #e2e8f0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3rem;
  align-items: center;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.8rem;
  border-radius: 9999px;
  background-color: rgba(2, 132, 199, 0.1);
  color: var(--primary-dark);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 1.25rem;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.18;
  color: var(--bg-dark);
  margin-bottom: 1.25rem;
  letter-spacing: -0.025em;
}

.hero h1 span {
  color: var(--primary);
}

.hero-lead {
  font-size: 1.15rem;
  line-height: 1.7;
  color: #475569;
  margin-bottom: 2rem;
}

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

.hero-trust-indicators {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid #e2e8f0;
  font-size: 0.85rem;
  color: #64748b;
}

.hero-trust-indicators span {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 600;
  color: #334155;
}

/* Terminal Preview Card */
.terminal-window {
  background: #0f172a;
  border-radius: var(--radius-md);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.2), 0 8px 10px -6px rgba(0, 0, 0, 0.2);
  overflow: hidden;
  border: 1px solid #334155;
}

.terminal-header {
  background: #1e293b;
  padding: 0.65rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.terminal-dots {
  display: flex;
  gap: 0.4rem;
}

.terminal-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}

.dot-red { background: #ef4444; }
.dot-yellow { background: #eab308; }
.dot-green { background: #22c55e; }

.terminal-title {
  color: #94a3b8;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
}

.terminal-body {
  padding: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: #e2e8f0;
  line-height: 1.7;
}

.term-cmd { color: #38bdf8; font-weight: 600; }
.term-res { color: #94a3b8; }
.term-success { color: #34d399; }
.term-param { color: #fbbf24; }

/* Sections Common */
.section {
  padding: 4.5rem 0;
}

.section-dark {
  background-color: var(--bg-dark);
  color: var(--text-light);
}

.section-white {
  background-color: #ffffff;
}

.section-title-wrap {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3.5rem;
}

.section-subtitle {
  color: var(--primary);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 2.15rem;
  font-weight: 800;
  color: var(--bg-dark);
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-dark .section-title {
  color: #ffffff;
}

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

.section-dark .section-description {
  color: #94a3b8;
}

/* Bento / Grid Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.feature-card {
  background: #ffffff;
  padding: 2rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background-color: rgba(2, 132, 199, 0.1);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  margin-bottom: 1.25rem;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--bg-dark);
}

.feature-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Course Cards */
.course-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.course-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all 0.25s ease;
}

.course-card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.course-header {
  padding: 1.75rem;
  border-bottom: 1px solid #f1f5f9;
  position: relative;
}

.course-badge {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  background: #f1f5f9;
  color: #475569;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.badge-popular {
  background: #e0f2fe;
  color: #0369a1;
}

.badge-advanced {
  background: #fef3c7;
  color: #92400e;
}

.course-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--bg-dark);
  margin-bottom: 0.5rem;
}

.course-meta {
  display: flex;
  gap: 1.25rem;
  font-size: 0.85rem;
  color: #64748b;
}

.course-body {
  padding: 1.75rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.course-overview {
  color: #475569;
  font-size: 0.925rem;
  margin-bottom: 1.25rem;
}

.course-topics {
  list-style: none;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.course-topics li {
  padding: 0.35rem 0;
  font-size: 0.875rem;
  color: #334155;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.course-topics li::before {
  content: '✓';
  color: var(--accent);
  font-weight: 800;
}

.course-footer {
  padding: 1.25rem 1.75rem;
  background: #f8fafc;
  border-top: 1px solid #f1f5f9;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.course-price {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--bg-dark);
}

.course-price span {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-muted);
}

/* Callout Box / Banner */
.callout-box {
  background: linear-gradient(135deg, var(--bg-card) 0%, #172554 100%);
  border-radius: var(--radius-lg);
  padding: 3.5rem;
  color: #ffffff;
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 2.5rem;
  align-items: center;
  box-shadow: var(--shadow-lg);
}

.callout-box h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.callout-box p {
  color: #cbd5e1;
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.callout-box .btn {
  padding: 0.85rem 1.75rem;
  font-size: 1rem;
}

/* Forms */
.form-card {
  background: #ffffff;
  padding: 2.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.form-group {
  margin-bottom: 1.35rem;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: #334155;
  margin-bottom: 0.4rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text-main);
  background: #ffffff;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

.form-hint {
  font-size: 0.8rem;
  color: #64748b;
  margin-top: 0.3rem;
}

/* Content Pages (About, Privacy, Terms) */
.page-header {
  background: linear-gradient(180deg, #ffffff 0%, #f1f5f9 100%);
  padding: 3.5rem 0 2.5rem;
  border-bottom: 1px solid #e2e8f0;
  text-align: center;
}

.page-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--bg-dark);
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.page-header p {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 650px;
  margin: 0 auto;
}

.content-wrapper {
  max-width: 860px;
  margin: 0 auto;
  background: #ffffff;
  padding: 3rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.prose h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--bg-dark);
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid #f1f5f9;
}

.prose h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: #1e293b;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.prose p {
  color: #475569;
  line-height: 1.75;
  margin-bottom: 1.25rem;
}

.prose ul, .prose ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
  color: #475569;
}

.prose li {
  margin-bottom: 0.4rem;
  line-height: 1.65;
}

.prose blockquote {
  border-left: 4px solid var(--primary);
  padding: 0.75rem 1.25rem;
  background-color: #f8fafc;
  color: #334155;
  font-style: italic;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 850px;
  margin: 0 auto;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  text-align: left;
  background: none;
  border: none;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--bg-dark);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.15s ease;
}

.faq-question:hover {
  background-color: #f8fafc;
}

.faq-icon {
  font-size: 1.25rem;
  color: var(--primary);
  transition: transform 0.2s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 1.5rem;
  color: #475569;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 600px;
  padding: 0 1.5rem 1.5rem;
}

/* Footer */
.site-footer {
  background: var(--bg-dark);
  color: #cbd5e1;
  padding: 4.5rem 0 2rem;
  margin-top: auto;
  border-top: 1px solid var(--border-dark);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-brand p {
  color: #94a3b8;
  font-size: 0.925rem;
  margin-top: 1rem;
  line-height: 1.6;
  max-width: 320px;
}

.footer-col h4 {
  color: #ffffff;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.65rem;
}

.footer-links a {
  color: #94a3b8;
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: #ffffff;
  text-decoration: underline;
}

.footer-contact-list {
  list-style: none;
  font-size: 0.9rem;
  color: #94a3b8;
}

.footer-contact-list li {
  margin-bottom: 0.75rem;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.footer-contact-list a {
  color: #94a3b8;
}

.footer-contact-list a:hover {
  color: #ffffff;
}

.footer-disclaimer {
  padding: 1.75rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.8rem;
  color: #94a3b8;
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: #64748b;
}

/* Success Alert */
.alert-success {
  background-color: #ecfdf5;
  border: 1px solid #a7f3d0;
  color: #065f46;
  padding: 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  display: none;
}

/* Responsive */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .features-grid, .course-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
  .callout-box {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 2.5rem 1.5rem;
  }
}

@media (max-width: 768px) {
  .top-bar { display: none; }
  .mobile-toggle { display: block; }
  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #ffffff;
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    box-shadow: var(--shadow-md);
    border-bottom: 1px solid var(--border-color);
    display: none;
  }
  .nav-menu.open {
    display: flex;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
  .features-grid, .course-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .content-wrapper {
    padding: 1.5rem;
  }
}