/* ============================================================
   InAppFlux — main stylesheet
   Design tokens, reset, typography, layout primitives
   (Light theme — Soft Blue with dark showcase panels)
   ============================================================ */

:root {
  /* ---------- Palette (light) ---------- */
  --bg-base: #F5F7FB;              /* page background */
  --bg-section: #FFFFFF;           /* primary surface */
  --bg-card: #FFFFFF;
  --bg-card-hover: #FAFBFE;
  --bg-soft: #EEF1F7;              /* subtle wash for alt sections */
  --bg-dark-panel: #0A0E27;        /* for dark showcase panels */
  --bg-dark-panel-alt: #06091E;

  --border-subtle: #E6EBF2;
  --border-strong: #D2DAE5;
  --border-dark: rgba(255,255,255,0.08); /* when used inside dark panels */

  --accent-blue: #2D5BFF;
  --accent-blue-soft: rgba(45,91,255,0.08);
  --accent-teal: #0E8D73;          /* text-safe teal on white (≥4.5:1) */
  --accent-teal-bright: #00B894;   /* vivid teal — only for gradients/indicators */
  --accent-teal-soft: rgba(14,141,115,0.08);
  --accent-glow-blue: rgba(45, 91, 255, 0.22);
  --accent-glow-teal: rgba(0, 184, 148, 0.20);

  --text-primary: #0F1735;
  --text-secondary: #5A6477;
  --text-muted: #8894A8;
  --text-inverse: #FFFFFF;
  --text-on-dark: #FFFFFF;

  --danger: #E63946;
  --warning: #F59E0B;
  --success: #00A682;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #2D5BFF 0%, #00B894 100%);
  --gradient-subtle: linear-gradient(135deg, rgba(45,91,255,0.08) 0%, rgba(0,184,148,0.06) 100%);
  --gradient-text: linear-gradient(90deg, #0F1735 0%, #5A6477 100%);
  --gradient-accent-text: linear-gradient(90deg, #2D5BFF 0%, #0E8D73 100%);
  --gradient-border: linear-gradient(135deg, rgba(45,91,255,0.4), rgba(0,184,148,0.4));

  /* Typography */
  --font-display: 'Space Grotesk', 'Segoe UI', system-ui, sans-serif;
  --font-body: 'DM Sans', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  /* Sizes */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 999px;

  /* Spacing scale */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  --space-32: 128px;

  /* Shadows — light theme */
  --shadow-sm: 0 2px 8px rgba(15,23,53,0.04);
  --shadow-md: 0 12px 32px rgba(15,23,53,0.08), 0 2px 6px rgba(15,23,53,0.04);
  --shadow-lg: 0 24px 60px rgba(15,23,53,0.10), 0 4px 14px rgba(15,23,53,0.06);
  --shadow-showcase: 0 30px 80px rgba(15,23,53,0.15), 0 0 0 1px rgba(15,23,53,0.04);
  --shadow-glow: 0 0 60px var(--accent-glow-blue);
  --shadow-glow-teal: 0 0 50px var(--accent-glow-teal);

  /* Transitions */
  --t-fast: 120ms ease;
  --t-med: 220ms cubic-bezier(0.4, 0, 0.2, 1);
  --t-slow: 420ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Container */
  --container-max: 1280px;
  --header-h: 72px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
}

/* dot-grid background — dark dots on light page */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(15,23,53,0.05) 1px, transparent 0);
  background-size: 32px 32px;
  z-index: -2;
  pointer-events: none;
}
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 15% 20%, rgba(45,91,255,0.08) 0, transparent 50%),
    radial-gradient(circle at 85% 80%, rgba(0,184,148,0.06) 0, transparent 50%);
  z-index: -1;
  pointer-events: none;
}

img, video, svg { max-width: 100%; height: auto; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; padding: 0; }
a { color: inherit; text-decoration: none; transition: color var(--t-fast); }
a:hover { color: var(--accent-teal); }
input, textarea, select { font-family: inherit; font-size: inherit; color: inherit; }

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-4) 0;
  color: var(--text-primary);
}
h1 { font-size: clamp(2.5rem, 5.5vw, 4.5rem); font-weight: 700; letter-spacing: -0.035em; }
h2 { font-size: clamp(2rem, 3.5vw, 3rem); letter-spacing: -0.025em; }
h3 { font-size: clamp(1.35rem, 2vw, 1.75rem); }
h4 { font-size: 1.125rem; font-weight: 600; }
p { margin: 0 0 var(--space-4) 0; color: var(--text-secondary); }
.lead {
  font-size: clamp(1.05rem, 1.4vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 640px;
}

.gradient-text {
  background: var(--gradient-accent-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent-teal);
  margin-bottom: var(--space-4);
}
.eyebrow::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--accent-teal);
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}
@media (min-width: 768px) { .container { padding: 0 var(--space-8); } }

section { padding: var(--space-20) 0; position: relative; }
@media (max-width: 767px) { section { padding: var(--space-16) 0; } }

.section-head { max-width: 760px; margin: 0 auto var(--space-12) auto; text-align: center; }
.section-head.left { text-align: left; margin-left: 0; }

/* Grid helpers */
.grid { display: grid; gap: var(--space-6); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

/* Utility */
.text-center { text-align: center; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.hidden { display: none !important; }

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms cubic-bezier(0.4,0,0.2,1), transform 700ms cubic-bezier(0.4,0,0.2,1);
}
.reveal.in-view { opacity: 1; transform: translateY(0); }
.reveal.delay-1 { transition-delay: 80ms; }
.reveal.delay-2 { transition-delay: 160ms; }
.reveal.delay-3 { transition-delay: 240ms; }
.reveal.delay-4 { transition-delay: 320ms; }

/* Focus states */
:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Scrollbar */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: rgba(15,23,53,0.15); border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: rgba(15,23,53,0.28); }

/* Selection */
::selection { background: var(--accent-blue); color: white; }