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

:root {
  --bg: #0a0a0a;
  --surface: #111111;
  --border: #1e1e1e;
  --text: #e0e0e0;
  --text-muted: #888888;
  --accent: #00e599;
  --accent-dim: #00cc8440;
  --white: #ffffff;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  opacity: 0.8;
}

/* ===== Nav ===== */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2.5rem;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--white);
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  opacity: 1;
}

/* ===== Hero (Homepage) ===== */
.hero {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 8rem 2rem 4rem;
  min-height: 100vh;
  position: relative;
  overflow: hidden;
}

.hero-bg-logo {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  height: auto;
  pointer-events: none;
  z-index: 0;
  mask-image: radial-gradient(ellipse 50% 50% at center, rgba(0,0,0,1) 20%, rgba(0,0,0,0) 100%);
  -webkit-mask-image: radial-gradient(ellipse 50% 50% at center, rgba(0,0,0,1) 20%, rgba(0,0,0,0) 100%);
}

.hero-bg-logo img {
  width: 100%;
  height: auto;
  opacity: 0.12;
  filter: grayscale(100%) brightness(2);
}

.hero > *:not(.hero-bg-logo) {
  position: relative;
  z-index: 1;
}

.hero-title {
  font-family: var(--font-mono);
  font-size: clamp(2.5rem, 8vw, 6rem);
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--white);
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.hero-tagline {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2.5vw, 1.5rem);
  color: var(--accent);
  letter-spacing: 0.25em;
  margin-bottom: 3rem;
  position: relative;
}

.hero-tagline::after {
  content: '█';
  animation: blink 1s step-end infinite;
  margin-left: 0.15em;
  font-size: 0.8em;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-desc {
  max-width: 560px;
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 3rem;
}

.hero-cta {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.85rem 2.2rem;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 2px;
  transition: background-color 0.2s, color 0.2s;
}

.hero-cta:hover {
  background-color: var(--accent);
  color: var(--bg);
  opacity: 1;
}

/* ===== Features Grid (Homepage) ===== */
.features {
  padding: 5rem 2rem;
  max-width: 1000px;
  margin: 0 auto;
  width: 100%;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2rem;
  transition: border-color 0.3s;
}

.feature-card:hover {
  border-color: var(--accent-dim);
}

.feature-icon {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--white);
  margin-bottom: 0.75rem;
}

.feature-card p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ===== About Page ===== */
.page-content {
  flex: 1;
  padding: 8rem 2rem 4rem;
  max-width: 720px;
  margin: 0 auto;
  width: 100%;
}

.page-header {
  text-align: center;
  margin-bottom: 4rem;
  position: relative;
  overflow: hidden;
  padding: 4rem 0;
}

.page-header-bg-logo {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  pointer-events: none;
  z-index: 0;
  mask-image: radial-gradient(ellipse 50% 50% at center, rgba(0,0,0,1) 20%, rgba(0,0,0,0) 100%);
  -webkit-mask-image: radial-gradient(ellipse 50% 50% at center, rgba(0,0,0,1) 20%, rgba(0,0,0,0) 100%);
}

.page-header-bg-logo img {
  width: 100%;
  height: auto;
  opacity: 0.12;
  filter: grayscale(100%) brightness(2);
}

.page-header > *:not(.page-header-bg-logo) {
  position: relative;
  z-index: 1;
}

.page-header h1 {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--white);
  margin-bottom: 1rem;
}

.page-header .subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
}

.section {
  margin-bottom: 3.5rem;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  display: block;
}

.section h2 {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--white);
  margin-bottom: 1rem;
}

.section p {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.85;
  margin-bottom: 1rem;
}

.section .opt-out-email {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--accent);
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 2px;
  background: var(--surface);
}

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 3rem 0;
}

/* ===== Footer ===== */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

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

.footer-socials a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color 0.2s;
}

.footer-socials a:hover {
  color: var(--accent);
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  nav {
    padding: 1rem 1.25rem;
  }

  .nav-links {
    gap: 1.25rem;
  }

  .hero {
    padding: 6rem 1.25rem 3rem;
  }

  .features {
    padding: 3rem 1.25rem;
  }

  .page-content {
    padding: 6rem 1.25rem 3rem;
  }

  footer {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 1.5rem 1.25rem;
  }
}