/* ═══════════════════════════════════════════════════════════
   ByteInfoTek Design System — main.css
   Light-theme-first. Professional enterprise SaaS aesthetic.
   ═══════════════════════════════════════════════════════════ */

/* ── GOOGLE FONTS ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

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

html {
  -moz-text-size-adjust: none;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

/* ── DESIGN TOKENS — LIGHT THEME (default) ────────────────── */
:root {
  /* Brand Colors */
  --color-primary:       #5B2D8E;
  --color-primary-dark:  #4C1D95;
  --color-primary-hover: #4C1D95;
  --color-primary-glow:  rgba(91,45,142,0.12);
  --color-cta:           #7C3AED;
  --color-cta-hover:     #6D28D9;
  --color-accent:        #06B6D4;
  --color-accent-glow:   rgba(6,182,212,0.12);
  --color-sky:           #0EA5E9;
  --color-teal:          #0891B2;
  --color-amber:         #F59E0B;
  --color-navy:          #1E1B3A;
  --color-success:       #10B981;
  --color-warning:       #F59E0B;
  --color-error:         #EF4444;

  /* Backgrounds */
  --color-bg:            #FFFFFF;
  --color-bg-alt:        #F8FAFC;
  --color-bg-blue:       #E0F2FE;
  --color-bg-purple:     #EDE9FE;
  --color-surface:       #FFFFFF;
  --color-surface-2:     #F1F5F9;
  --color-surface-3:     #E2E8F0;

  /* Text */
  --color-text:          #1E1B3A;
  --color-text-body:     #334155;
  --color-text-muted:    #64748B;
  --color-text-dim:      #94A3B8;

  /* Borders */
  --color-border:        #E2E8F0;
  --color-border-accent: rgba(91,45,142,0.25);

  /* Gradients */
  --gradient-hero:       linear-gradient(135deg, #F8FAFC 0%, #FFFFFF 50%, #F8FAFC 100%);
  --gradient-card:       linear-gradient(135deg, #FFFFFF, #FAFAFA);
  --gradient-accent:     linear-gradient(90deg, #5B2D8E, #7C3AED);
  --gradient-glow:       radial-gradient(ellipse at 50% 0%, rgba(91,45,142,0.08) 0%, transparent 70%);
  --gradient-cta:        linear-gradient(135deg, #7C3AED 0%, #5B2D8E 100%);

  /* Typography */
  --font-sans: 'Plus Jakarta Sans', 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  /* Type Scale */
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;
  --text-6xl:  3.75rem;
  --text-hero: clamp(2.5rem, 5vw, 4rem);

  /* Line Heights */
  --leading-tight:   1.2;
  --leading-snug:    1.35;
  --leading-normal:  1.6;
  --leading-relaxed: 1.75;

  /* Letter Spacing */
  --tracking-tight:  -0.025em;
  --tracking-normal:  0em;
  --tracking-wide:    0.05em;
  --tracking-wider:   0.1em;

  /* 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-7:  1.75rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Containers */
  --container-sm:  640px;
  --container-md:  768px;
  --container-lg:  1024px;
  --container-xl:  1200px;
  --container-2xl: 1440px;

  /* Border Radius */
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   24px;
  --radius-2xl:  40px;
  --radius-full: 9999px;

  /* Shadows — light theme uses subtle, lifted shadows */
  --shadow-sm:         0 1px 2px rgba(0,0,0,0.05);
  --shadow-md:         0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg:         0 8px 30px rgba(0,0,0,0.12);
  --shadow-card:       0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-card-hover: 0 10px 40px rgba(0,0,0,0.12), 0 2px 6px rgba(0,0,0,0.08);
  --shadow-glow-purple: 0 0 40px rgba(124,58,237,0.15);
  --shadow-glow-cyan:   0 0 40px rgba(6,182,212,0.12);

  /* Motion */
  --transition-fast:   120ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base:   220ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow:   380ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 300ms cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-theme:  0.3s ease;
}

/* ── DESIGN TOKENS — DARK THEME ───────────────────────────── */
[data-theme="dark"] {
  /* Backgrounds */
  --color-bg:            #080C14;
  --color-bg-alt:        #0F1623;
  --color-bg-blue:       #0D1B2A;
  --color-bg-purple:     #1A0F2E;
  --color-surface:       #0F1623;
  --color-surface-2:     #161E2E;
  --color-surface-3:     #1C2540;

  /* Text */
  --color-text:          #F1F5F9;
  --color-text-body:     #CBD5E1;
  --color-text-muted:    #94A3B8;
  --color-text-dim:      #64748B;

  /* Borders */
  --color-border:        #1E293B;
  --color-border-accent: rgba(124,58,237,0.3);

  /* Gradients */
  --gradient-hero:       linear-gradient(135deg, #080C14 0%, #0F1623 60%, #0A1020 100%);
  --gradient-card:       linear-gradient(135deg, #0F1623, #161E2E);
  --gradient-glow:       radial-gradient(ellipse at 50% 0%, rgba(124,58,237,0.15) 0%, transparent 70%);

  /* Shadows — dark theme uses border glow */
  --shadow-sm:         0 1px 2px rgba(0,0,0,0.4);
  --shadow-md:         0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg:         0 8px 32px rgba(0,0,0,0.6);
  --shadow-card:       0 1px 3px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.05);
  --shadow-card-hover: 0 8px 32px rgba(0,0,0,0.5), 0 0 0 1px rgba(124,58,237,0.25);
}

/* ── REDUCED MOTION ───────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ── BASE STYLES ──────────────────────────────────────────── */
body {
  min-height: 100dvh;
  line-height: var(--leading-normal);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--color-text-body);
  background-color: var(--color-bg);
  overflow-x: hidden;
  transition: background-color var(--transition-theme), color var(--transition-theme);
}

img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
ul[role="list"], ol[role="list"] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4, h5, h6 {
  text-wrap: balance;
  line-height: var(--leading-tight);
  color: var(--color-text);
}
p, li, figcaption { text-wrap: pretty; max-width: 72ch; }

::selection {
  background: rgba(124,58,237,0.2);
  color: var(--color-text);
}

:focus-visible {
  outline: 2px solid var(--color-cta);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

a {
  color: var(--color-cta);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--color-primary); }
button { cursor: pointer; background: none; border: none; }

/* ── UTILITIES ────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0;
}

.skip-link {
  position: absolute; top: -100%; left: var(--space-4);
  background: var(--color-cta); color: #fff;
  padding: var(--space-2) var(--space-4); border-radius: var(--radius-md);
  font-size: var(--text-sm); font-weight: 600; z-index: 9999;
}
.skip-link:focus { top: var(--space-2); color: #fff; }

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

/* ── SECTION SPACING ──────────────────────────────────────── */
.section {
  padding: clamp(var(--space-20), 8vw, var(--space-32)) 0;
  position: relative;
}

.section--surface {
  background: var(--color-bg-alt);
  transition: background-color var(--transition-theme);
}
.section--surface-2 {
  background: var(--color-surface-2);
  transition: background-color var(--transition-theme);
}
.section--hero {
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

/* ── BACKGROUND PATTERNS ─────────────────────────────────── */
.bg-grid-diagonal {
  background-image:
    repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 40px,
      rgba(91,45,142,0.03) 40px,
      rgba(91,45,142,0.03) 41px
    );
}
[data-theme="dark"] .bg-grid-diagonal {
  background-image:
    repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 40px,
      rgba(255,255,255,0.015) 40px,
      rgba(255,255,255,0.015) 41px
    );
}

.bg-hex-grid {
  background-image:
    radial-gradient(circle at 25% 25%, rgba(91,45,142,0.04) 2px, transparent 2px),
    radial-gradient(circle at 75% 75%, rgba(6,182,212,0.04) 2px, transparent 2px);
  background-size: 60px 60px;
}
[data-theme="dark"] .bg-hex-grid {
  background-image:
    radial-gradient(circle at 25% 25%, rgba(124,58,237,0.03) 2px, transparent 2px),
    radial-gradient(circle at 75% 75%, rgba(6,182,212,0.03) 2px, transparent 2px);
}

.bg-glow-top {
  background-image: var(--gradient-glow);
}

/* CTA band animated sweep */
.bg-cta-sweep {
  position: relative;
  overflow: hidden;
}
.bg-cta-sweep::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(
    110deg,
    transparent 20%,
    rgba(255,255,255,0.08) 40%,
    rgba(255,255,255,0.04) 60%,
    transparent 80%
  );
  animation: ctaSweep 8s ease-in-out infinite;
}
@keyframes ctaSweep {
  0%, 100% { transform: translateX(-100%); }
  50% { transform: translateX(100%); }
}