/* ============================================
   Situational AI — GitHub Pages Stylesheet
   ============================================ */

:root {
  --color-bg: #0a1929;
  --color-bg-alt: #0d1f33;
  --color-surface: #122842;
  --color-surface-hover: #173354;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-text: #ffffff;
  --color-text-muted: rgba(255, 255, 255, 0.65);
  --color-primary: #2397f8;
  --color-primary-light: #5bb5ff;
  --color-accent: #f4a261;
  --color-accent-light: #f7b885;
  --color-gradient-start: #2397f8;
  --color-gradient-end: #f4a261;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

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

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

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

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: 12px 0;
}

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

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  color: var(--color-primary);
  font-size: 1.4rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: var(--transition);
}

.nav-links a: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 {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font-family);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--color-accent);
  color: #1a1a1a;
  box-shadow: 0 4px 24px rgba(244, 162, 97, 0.35);
  font-weight: 700;
}

.btn-primary:hover {
  background: var(--color-accent-light);
  box-shadow: 0 8px 36px rgba(244, 162, 97, 0.5);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-light);
  background: rgba(35, 151, 248, 0.08);
}

.btn-nav {
  padding: 8px 20px;
  background: rgba(35, 151, 248, 0.15);
  color: var(--color-primary-light);
  border: 1px solid rgba(35, 151, 248, 0.3);
  border-radius: var(--radius-sm);
}

.btn-nav:hover {
  background: rgba(35, 151, 248, 0.25);
  color: #fff !important;
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.85rem;
}

/* ============================================
   Hero
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 0 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 100% 80% at 50% 40%, rgba(35, 151, 248, 0.35) 0%, rgba(35, 151, 248, 0.1) 30%, transparent 70%),
    radial-gradient(ellipse 60% 50% at 50% 100%, rgba(244, 162, 97, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(244, 162, 97, 0.1);
  border: 1px solid rgba(244, 162, 97, 0.2);
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.gradient-text {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
}

.stat-label {
  display: block;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--color-border);
}

/* ============================================
   Sections
   ============================================ */
.section {
  padding: 100px 0;
}

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

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary-light);
  background: rgba(35, 151, 248, 0.1);
  border: 1px solid rgba(35, 151, 248, 0.2);
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 650px;
  margin: 0 auto;
  line-height: 1.7;
}

.section-cta {
  text-align: center;
  margin-top: 48px;
}

/* ============================================
   About Grid
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.about-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 36px 32px;
  transition: var(--transition);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
}

.about-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-6px);
  box-shadow: 0 16px 48px rgba(35, 151, 248, 0.2);
}

.about-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.about-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.about-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ============================================
   Video Section
   ============================================ */
.video-wrapper {
  max-width: 900px;
  margin: 0 auto;
}

.video-container {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.video-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  background: linear-gradient(135deg, rgba(35, 151, 248, 0.05), rgba(244, 162, 97, 0.05));
}

.play-button {
  transition: var(--transition);
  opacity: 0.9;
}

.video-placeholder:hover .play-button {
  opacity: 1;
  transform: scale(1.1);
}

.video-placeholder-text {
  margin-top: 16px;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.video-note {
  margin-top: 8px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  opacity: 0.6;
}

.video-frame {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.video-frame.hidden {
  display: none;
}

.video-url-input {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

.video-url-input input {
  flex: 1;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-family);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
}

.video-url-input input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(35, 151, 248, 0.15);
}

.video-url-input input::placeholder {
  color: var(--color-text-muted);
}

/* ============================================
   Features Grid
   ============================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.feature-card {
  padding: 36px 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: var(--transition);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
}

.feature-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-6px);
  box-shadow: 0 16px 48px rgba(244, 162, 97, 0.15);
}

.feature-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
  line-height: 1;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 12px;
}

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

/* ============================================
   Blog Grid
   ============================================ */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.blog-card {
  display: block;
  padding: 32px 28px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: var(--transition);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
}

.blog-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-6px);
  box-shadow: 0 16px 48px rgba(35, 151, 248, 0.2);
}

.blog-card-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(244, 162, 97, 0.1);
  margin-bottom: 16px;
}

.blog-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 12px;
  line-height: 1.3;
}

.blog-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

.blog-card-date {
  font-size: 0.85rem;
  color: var(--color-primary-light);
  font-weight: 500;
}

/* ============================================
   Contact
   ============================================ */
.contact-wrapper {
  text-align: center;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
}

.contact-link:hover {
  border-color: var(--color-primary);
  background: rgba(35, 151, 248, 0.08);
  transform: translateY(-2px);
}

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

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-logo {
  font-size: 1.1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

/* ============================================
   Blog Page Styles
   ============================================ */
.blog-hero {
  padding: 140px 0 60px;
  text-align: center;
}

.blog-list {
  display: grid;
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}

.blog-list-card {
  display: flex;
  gap: 24px;
  padding: 28px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: var(--transition);
}

.blog-list-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.blog-list-card .blog-card-tag {
  margin-bottom: 8px;
}

.blog-list-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.blog-list-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
  margin-bottom: 12px;
}

.blog-list-date {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* Blog Post */
.blog-post {
  max-width: 740px;
  margin: 0 auto;
  padding: 140px 24px 80px;
}

.blog-post-header {
  margin-bottom: 48px;
}

.blog-post-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  transition: var(--transition);
}

.blog-post-back:hover {
  color: var(--color-primary-light);
}

.blog-post-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
}

.blog-post-meta {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.blog-post-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-text);
}

.blog-post-content h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 48px 0 16px;
}

.blog-post-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 36px 0 12px;
}

.blog-post-content p {
  margin-bottom: 20px;
  color: var(--color-text-muted);
}

.blog-post-content p:first-child {
  color: var(--color-text);
  font-size: 1.15rem;
}

.blog-post-content blockquote {
  border-left: 3px solid var(--color-primary);
  padding: 16px 24px;
  margin: 32px 0;
  background: rgba(35, 151, 248, 0.05);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.blog-post-content blockquote p {
  color: var(--color-text);
  font-style: italic;
  margin-bottom: 0;
}

.blog-post-content ul, .blog-post-content ol {
  margin: 20px 0;
  padding-left: 24px;
  color: var(--color-text-muted);
}

.blog-post-content li {
  margin-bottom: 8px;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--color-bg-alt);
    flex-direction: column;
    padding: 80px 32px 32px;
    gap: 24px;
    transition: var(--transition);
    border-left: 1px solid var(--color-border);
  }

  .nav-links.active {
    right: 0;
  }

  .nav-toggle {
    display: flex;
    z-index: 1001;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-stats {
    gap: 24px;
  }

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

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

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

  .footer-content {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .video-url-input {
    flex-direction: column;
  }

  .contact-links {
    flex-direction: column;
    align-items: center;
  }

  .blog-list-card {
    flex-direction: column;
    gap: 12px;
  }
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}