/* ===== Design Tokens ===== */
:root {
  /* Type scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Dark privacy-focused palette */
  --color-bg:             #0a0a0a;
  --color-surface:        #111111;
  --color-surface-2:      #1a1a1a;
  --color-surface-offset: #0e0e0e;
  --color-divider:        #222222;
  --color-border:         #2a2a2a;

  --color-text:           #e0e0e0;
  --color-text-muted:     #888888;
  --color-text-faint:     #555555;

  /* Primary accent — terminal green/cyan */
  --color-primary:        #00e5a0;
  --color-primary-hover:  #00c98c;
  --color-primary-active: #00a874;
  --color-primary-dim:    rgba(0, 229, 160, 0.08);
  --color-primary-glow:   rgba(0, 229, 160, 0.15);

  /* Secondary accent — cold blue */
  --color-accent:         #3d8bfd;

  /* Fonts */
  --font-body: 'Satoshi', 'Inter', sans-serif;
  --font-display: 'JetBrains Mono', 'Geist Mono', monospace;
  --font-mono: 'JetBrains Mono', 'Geist Mono', monospace;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  /* Shadows */
  --shadow-glow: 0 0 40px rgba(0, 229, 160, 0.08);
  --shadow-glow-strong: 0 0 80px rgba(0, 229, 160, 0.15);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
}

/* ===== Page Layout ===== */
body {
  background: var(--color-bg);
  color: var(--color-text);
  overflow-x: hidden;
}

.page-wrapper {
  position: relative;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* ===== Ambient Background ===== */
.ambient-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.ambient-bg::before {
  content: '';
  position: absolute;
  top: -40%;
  left: -20%;
  width: 80%;
  height: 80%;
  background: radial-gradient(ellipse, rgba(0, 229, 160, 0.04) 0%, transparent 70%);
  animation: drift 20s ease-in-out infinite alternate;
}

.ambient-bg::after {
  content: '';
  position: absolute;
  bottom: -30%;
  right: -20%;
  width: 70%;
  height: 70%;
  background: radial-gradient(ellipse, rgba(61, 139, 253, 0.03) 0%, transparent 70%);
  animation: drift 25s ease-in-out infinite alternate-reverse;
}

@keyframes drift {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(5%, 3%) scale(1.1); }
}

/* Grid pattern overlay */
.grid-overlay {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 229, 160, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 160, 0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 20%, transparent 100%);
}

/* ===== Header / Nav ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}

.logo svg {
  width: 32px;
  height: 32px;
}

.logo-text {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-primary);
}

.nav-status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 4px var(--color-primary); }
  50% { opacity: 0.4; box-shadow: none; }
}

/* ===== Hero Section ===== */
.hero {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 80vh;
  padding: var(--space-16) var(--space-6);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-4);
  margin-bottom: var(--space-8);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  border: 1px solid rgba(0, 229, 160, 0.2);
  border-radius: var(--radius-full);
  background: var(--color-primary-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-badge svg {
  width: 14px;
  height: 14px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: var(--space-6);
  color: var(--color-text);
}

.hero-title .accent {
  color: var(--color-primary);
  position: relative;
}

.hero-subtitle {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto var(--space-10);
  line-height: 1.6;
}

/* Terminal block in hero */
.terminal-block {
  max-width: 560px;
  width: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-align: left;
  box-shadow: var(--shadow-glow);
}

.terminal-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-2);
  border-bottom: 1px solid var(--color-border);
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.terminal-dot--red { background: #ff5f57; }
.terminal-dot--yellow { background: #febc2e; }
.terminal-dot--green { background: #28c840; }

.terminal-title {
  margin-left: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.terminal-body {
  padding: var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.8;
}

.terminal-line {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-1);
  opacity: 0;
  animation: type-in 0.4s var(--ease-out) forwards;
}

.terminal-line:nth-child(1) { animation-delay: 0.3s; }
.terminal-line:nth-child(2) { animation-delay: 0.8s; }
.terminal-line:nth-child(3) { animation-delay: 1.3s; }
.terminal-line:nth-child(4) { animation-delay: 1.8s; }
.terminal-line:nth-child(5) { animation-delay: 2.3s; }
.terminal-line:nth-child(6) { animation-delay: 2.8s; }

@keyframes type-in {
  from { opacity: 0; transform: translateX(-4px); }
  to { opacity: 1; transform: translateX(0); }
}

.terminal-prompt {
  color: var(--color-primary);
  user-select: none;
  flex-shrink: 0;
}

.terminal-output {
  color: var(--color-text-muted);
}

.terminal-output .highlight {
  color: var(--color-primary);
}

.terminal-cursor {
  display: inline-block;
  width: 8px;
  height: 1.1em;
  background: var(--color-primary);
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
  margin-left: var(--space-1);
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* ===== Features Section ===== */
.features {
  position: relative;
  z-index: 1;
  padding: clamp(var(--space-12), 8vw, var(--space-24)) var(--space-6);
}

.features-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
}

.section-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-3);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-12);
  color: var(--color-text);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

@media (max-width: 768px) {
  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
}

.feature-card {
  padding: var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-interactive),
              box-shadow var(--transition-interactive);
}

.feature-card:hover {
  border-color: rgba(0, 229, 160, 0.3);
  box-shadow: var(--shadow-glow);
}

.feature-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  color: var(--color-primary);
  background: var(--color-primary-dim);
  border-radius: var(--radius-md);
}

.feature-icon svg {
  width: 20px;
  height: 20px;
}

.feature-title {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

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

/* ===== Promise Section ===== */
.promise {
  position: relative;
  z-index: 1;
  padding: clamp(var(--space-12), 8vw, var(--space-24)) var(--space-6);
  text-align: center;
}

.promise-inner {
  max-width: var(--content-narrow);
  margin: 0 auto;
}

.promise-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-8);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  background: var(--color-primary-dim);
  border: 1px solid rgba(0, 229, 160, 0.15);
  border-radius: 50%;
}

.promise-icon svg {
  width: 28px;
  height: 28px;
}

.promise-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-6);
  color: var(--color-text);
}

.promise-text {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

.promise-text:last-of-type {
  margin-bottom: 0;
}

.promise-highlight {
  color: var(--color-primary);
  font-weight: 600;
}

/* ===== Divider ===== */
.section-divider {
  max-width: var(--content-default);
  margin: 0 auto;
  border: none;
  border-top: 1px solid var(--color-divider);
}

/* ===== Footer ===== */
.site-footer {
  position: relative;
  z-index: 1;
  padding: var(--space-10) var(--space-6);
  text-align: center;
  border-top: 1px solid var(--color-divider);
}

.footer-content {
  max-width: var(--content-default);
  margin: 0 auto;
}

.footer-brand {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.footer-legal {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}

.footer-attr {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer-attr a {
  color: var(--color-text-faint);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-attr a:hover {
  color: var(--color-primary);
}

/* ===== Scroll Fade-In (IntersectionObserver-based) ===== */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .hero {
    min-height: 70vh;
    padding: var(--space-12) var(--space-4);
  }

  .hero-title {
    letter-spacing: -0.02em;
  }

  .terminal-block {
    margin: 0 calc(-1 * var(--space-2));
    border-radius: var(--radius-md);
  }

  .site-header {
    padding: var(--space-3) var(--space-4);
  }

  .feature-card {
    padding: var(--space-6);
  }
}