/* Sightline Brand CSS */

:root {
  /* Core Palette */
  --bg-main: #020513;
  --bg-panel: #050b18;
  --accent: #00a6ff;
  --accent-soft: rgba(0, 166, 255, 0.6);
  --accent-start: #11b3ff;
  --accent-end: #0048a4;
  --text-main: #f5faff;
  --text-muted: #8ea4c7;
  --border-subtle: #1a253a;
  --danger: #ff3b30;

  /* Semantic Mappings */
  --primary-color: var(--accent);
  --primary-hover: var(--accent-start);
  --text-color: var(--text-main);
  --text-light: var(--text-muted);
  --bg-color: var(--bg-main);
  --bg-light: var(--bg-panel);
  --border-color: var(--border-subtle);
  --shadow: 0 14px 40px rgba(0, 0, 0, 0.9);
  --shadow-lg: 0 26px 70px rgba(0, 0, 0, 0.9);
  --radius: 20px;
}

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Inter", "Segoe UI", sans-serif;
  line-height: 1.55;
  color: var(--text-main);
  background-color: var(--bg-main);
  background: radial-gradient(circle at top, #071a33 0%, var(--bg-main) 55%),
    radial-gradient(circle at bottom, #01020a 0%, #000000 55%);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Header */
header {
  background-color: transparent; /* Transparent to let gradient show */
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  padding: 1.5rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
}

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

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

.logo-img {
  width: 40px;
  height: 40px;
  border-radius: 14px;
  box-shadow: 0 0 20px rgba(17, 179, 255, 0.4);
}

.logo-text {
  letter-spacing: 0.3em;
  text-transform: uppercase;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-main);
}

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

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  transition: color 0.2s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links a:hover {
  color: var(--text-main);
  text-shadow: 0 0 10px var(--accent-soft);
}

.github-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 9px 20px;
  background: rgba(3, 10, 26, 0.9);
  color: #d0e3ff;
  border: 1px solid rgba(120, 160, 210, 0.6);
  border-radius: 999px;
  transition: all 0.2s;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.github-link:hover {
  background: rgba(10, 20, 40, 0.9);
  border-color: var(--accent);
  color: var(--text-main);
  box-shadow: 0 0 15px rgba(0, 166, 255, 0.3);
}

/* Hero Section */
.hero {
  padding: 8rem 0 6rem;
  background: transparent;
  text-align: center;
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: radial-gradient(
    circle at center,
    rgba(0, 166, 255, 0.5),
    transparent 70%
  );
  box-shadow: 0 0 18px rgba(255, 255, 255, 0.7), 0 0 40px var(--accent-soft);
  opacity: 0.4;
  pointer-events: none;
  z-index: -1;
}

.hero-content h1 {
  font-size: 3.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text-main);
  text-shadow: 0 0 30px rgba(0, 166, 255, 0.3);
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: 3rem;
  color: var(--text-muted);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 3rem;
}

.btn {
  border-radius: 999px;
  padding: 12px 32px;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s;
  display: inline-block;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(180deg, #4dd3ff 0%, #08a4ff 38%, #0071cc 100%);
  color: #ffffff;
  box-shadow: 0 0 20px rgba(0, 190, 255, 0.5), 0 8px 24px rgba(0, 0, 0, 0.5);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 190, 255, 0.7), 0 12px 30px rgba(0, 0, 0, 0.6);
}

.btn-secondary {
  background: rgba(3, 10, 26, 0.8);
  color: #d0e3ff;
  border: 1px solid rgba(120, 160, 210, 0.4);
}

.btn-secondary:hover {
  background: rgba(10, 25, 50, 0.9);
  border-color: var(--accent);
  color: var(--text-main);
  box-shadow: 0 0 20px rgba(0, 166, 255, 0.2);
}

.version-info {
  color: var(--text-muted);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  opacity: 0.7;
}

/* Screenshot Section */
.screenshot-section {
  padding: 2rem 0 6rem;
  background-color: transparent;
}

.screenshot-wrapper {
  text-align: center;
  perspective: 1000px;
  position: relative;
  max-width: 1040px; /* Match container width */
  margin: auto;
}

/* Carousel Styles */
.carousel-slide {
  display: none;
  animation: fadeEffect 1s; /* Add animation */
}

/* Make sure the first slide is visible initially if JS fails or before JS runs (optional, but handled by JS) */
.carousel-slide:first-child {
  display: block;
}

.screenshot {
  max-width: 100%;
  border-radius: 20px;
  box-shadow: 0 0 50px rgba(0, 166, 255, 0.15), 0 20px 60px rgba(0, 0, 0, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.08);
  background-color: var(--bg-panel);
  min-height: 400px;
  display: block;
  margin: 0 auto;
  transform: rotateX(2deg); /* Keep the slight 3D effect */
  transition: transform 0.5s ease;
}

.screenshot:hover {
  transform: rotateX(0deg) scale(1.02);
}

/* Carousel Navigation Arrows */
.prev,
.next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  padding: 16px;
  margin-top: -22px;
  color: white;
  font-weight: bold;
  font-size: 24px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
  user-select: none;
  background-color: rgba(0, 0, 0, 0.3); /* Subtle background */
  text-decoration: none;
  z-index: 10;
  opacity: 0; /* Hidden by default, show on hover of container */
}

.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}

.prev {
  left: 0;
  border-radius: 0 3px 3px 0;
}

.screenshot-wrapper:hover .prev,
.screenshot-wrapper:hover .next {
  opacity: 1; /* Show arrows on hover */
}

.prev:hover,
.next:hover {
  background-color: rgba(0, 166, 255, 0.6); /* Brand accent color */
  box-shadow: 0 0 15px rgba(0, 166, 255, 0.5);
}

/* Fade animation */
@keyframes fadeEffect {
  from {
    opacity: 0.4;
  }
  to {
    opacity: 1;
  }
}

.screenshot-caption {
  margin-top: 2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}

/* Features Section */
.features {
  padding: 6rem 0;
  background-color: transparent;
}

.features h2,
.download h2,
.about h2 {
  font-size: 1.8rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 4rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: rgba(210, 225, 255, 0.9);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  padding: 2.5rem;
  background: rgba(5, 11, 24, 0.6);
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.04);
  transition: all 0.3s;
  backdrop-filter: blur(10px);
}

.feature-card:hover {
  transform: translateY(-5px);
  background: rgba(5, 11, 24, 0.8);
  border-color: rgba(0, 166, 255, 0.3);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, #fff 0%, #8ea4c7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.feature-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-main);
  letter-spacing: 0.02em;
}

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

/* Download Section */
.download {
  padding: 6rem 0;
  background-color: transparent;
}

.download-subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 3rem;
}

.download-main {
  text-align: center;
  margin-bottom: 2rem;
}

.btn-download-main {
  background: linear-gradient(180deg, #4dd3ff 0%, #08a4ff 38%, #0071cc 100%);
  color: white;
  padding: 1.5rem 4rem;
  font-size: 1.2rem;
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  transition: all 0.3s;
  border-radius: 999px;
  box-shadow: 0 0 30px rgba(0, 190, 255, 0.4), 0 10px 30px rgba(0, 0, 0, 0.6);
  text-decoration: none;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.btn-download-main:hover {
  transform: translateY(-4px);
  box-shadow: 0 0 50px rgba(0, 190, 255, 0.6), 0 15px 40px rgba(0, 0, 0, 0.8);
}

.btn-download-main svg {
  width: 28px;
  height: 28px;
}

.source-note {
  text-align: center;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.source-note p {
  color: var(--text-muted);
}

.source-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.source-link:hover {
  color: var(--accent-start);
  text-decoration: underline;
  text-shadow: 0 0 10px rgba(0, 166, 255, 0.4);
}

/* About Section */
.about {
  padding: 6rem 0;
  background-color: transparent;
}

.about-content {
  max-width: 800px;
  margin: 0 auto;
  background: var(--bg-panel);
  padding: 3rem;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.04);
  box-shadow: var(--shadow);
}

.about-text p {
  margin-bottom: 1.5rem;
  line-height: 1.8;
  color: var(--text-muted);
}

.about-text h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-main);
}

.about-text ol,
.about-text ul {
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-muted);
}

.about-text li {
  margin-bottom: 0.75rem;
  line-height: 1.8;
}

.about-text a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

.about-text a:hover {
  color: var(--accent-start);
  text-decoration: underline;
}

/* Footer */
footer {
  padding: 4rem 0;
  background-color: var(--bg-panel);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  text-align: center;
}

footer p {
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

footer a {
  color: var(--text-muted);
  text-decoration: none;
  opacity: 0.7;
  transition: all 0.2s;
}

footer a:hover {
  opacity: 1;
  color: var(--text-main);
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 1.5rem;
  }

  .nav-links {
    gap: 1.5rem;
  }

  .hero-content h1 {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
    padding: 0 2rem;
  }

  .features h2,
  .download h2,
  .about h2 {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 4rem 0;
  }

  .hero-content h1 {
    font-size: 2rem;
  }

  .logo-text {
    display: none;
  }

  .nav-links {
    gap: 1rem;
  }

  .nav-links a span {
    display: none;
  }
}