/* =============================================================================
   TEKVEX — DESIGN SYSTEM
   -----------------------------------------------------------------------------
   Table of contents:
     1. Design tokens (color, type, spacing, radius, shadow)
     2. Reset & base
     3. Typography utilities
     4. Layout primitives (container, section, grid)
     5. Signature component: corner-bracket frame
     6. Header & navigation
     7. Buttons
     8. Hero + ecosystem schematic diagram
     9. Section headers (eyebrow + title)
    10. Product cards & product grid
    11. Featured product panel
    12. Footer
    13. Utilities
    14. Responsive breakpoints
    15. Accessibility (focus, reduced motion)
   ============================================================================= */

/* -----------------------------------------------------------------------------
   1. DESIGN TOKENS
   Palette: near-black ground, cool grays, single technical-green accent used
   sparingly. This mirrors the existing TekVex identity — do not introduce a
   second dominant hue (e.g. electric blue) without updating brand guidance.
----------------------------------------------------------------------------- */
:root {
  /* Surfaces */
  --ink: #0a0b0d;              /* page background */
  --surface: #121417;          /* card / panel background */
  --surface-raised: #191c20;   /* hovered / elevated surface */
  --border: #23262b;           /* default hairline border */
  --border-strong: #33373e;    /* emphasized border */

  /* Text */
  --paper: #f3f4f6;            /* primary text */
  --fog: #9ba1a8;               /* secondary text */
  --fog-dim: #686e76;           /* tertiary / disabled text */

  /* Accent — technical green, used sparingly, never as a dominant fill */
  --signal: #2fd98a;
  --signal-strong: #3cf29c;
  --signal-dim: #1b7a4e;
  --signal-glow: rgba(47, 217, 138, 0.14);

  /* Type */
  --font-display: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Layout */
  --container-max: 1180px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --header-height: 72px;

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --duration-fast: 150ms;
  --duration-base: 280ms;
}

/* -----------------------------------------------------------------------------
   2. RESET & BASE
----------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  background-color: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;

  /* Subtle "blueprint" texture: two faint hairline grids. Kept extremely
     low-opacity so it reads as material, not decoration. */
  background-image: linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 48px 48px;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
}

ul {
  list-style: none;
}

/* -----------------------------------------------------------------------------
   3. TYPOGRAPHY
----------------------------------------------------------------------------- */
h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--paper);
}

h1 {
  font-size: clamp(2.4rem, 5vw, 4.2rem);
}

h2 {
  font-size: clamp(1.9rem, 3.2vw, 2.75rem);
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.6rem);
}

p {
  color: var(--fog);
}

.lede {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  color: var(--fog);
  max-width: 46ch;
}

/* Monospace "system" label — used for eyebrows, nav, prices, tags */
.mono-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fog);
}

.mono-label--accent {
  color: var(--signal);
}

/* -----------------------------------------------------------------------------
   4. LAYOUT PRIMITIVES
----------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.section {
  padding-block: var(--space-24);
}

.section--tight {
  padding-block: var(--space-16);
}

.grid {
  display: grid;
  gap: var(--space-6);
}

/* -----------------------------------------------------------------------------
   5. SIGNATURE COMPONENT — CORNER-BRACKET FRAME
   The recurring visual device across the site: four small L-shaped brackets
   at the corners of a panel, referencing engineering schematics / targeting
   overlays rather than a generic rounded card with a shadow.
----------------------------------------------------------------------------- */
.bracket-frame {
  position: relative;
  border: 1px solid var(--border);
  background-color: var(--surface);
  transition: border-color var(--duration-base) var(--ease), background-color var(--duration-base) var(--ease);
}

.bracket-frame:hover {
  border-color: var(--border-strong);
  background-color: var(--surface-raised);
}

.corner {
  position: absolute;
  width: 14px;
  height: 14px;
  pointer-events: none;
  opacity: 0.55;
  transition: opacity var(--duration-base) var(--ease);
}

.bracket-frame:hover .corner {
  opacity: 1;
}

.corner.tl {
  top: -1px;
  left: -1px;
  border-top: 2px solid var(--signal);
  border-left: 2px solid var(--signal);
}

.corner.tr {
  top: -1px;
  right: -1px;
  border-top: 2px solid var(--signal);
  border-right: 2px solid var(--signal);
}

.corner.bl {
  bottom: -1px;
  left: -1px;
  border-bottom: 2px solid var(--signal);
  border-left: 2px solid var(--signal);
}

.corner.br {
  bottom: -1px;
  right: -1px;
  border-bottom: 2px solid var(--signal);
  border-right: 2px solid var(--signal);
}

/* -----------------------------------------------------------------------------
   6. HEADER & NAVIGATION
----------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  height: var(--header-height);
  z-index: 100;
  display: flex;
  align-items: center;
  background-color: rgba(10, 11, 13, 0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration-base) var(--ease), background-color var(--duration-base) var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--border);
  background-color: rgba(10, 11, 13, 0.92);
}

.header-inner {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--paper);
}

.brand span.brand-suffix {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  color: var(--signal);
  text-transform: uppercase;
  border: 1px solid var(--signal-dim);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-desktop a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--fog);
  position: relative;
  padding-block: var(--space-1);
  transition: color var(--duration-fast) var(--ease);
}

.nav-desktop a:hover,
.nav-desktop a:focus-visible {
  color: var(--paper);
}

.nav-desktop a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 1px;
  background-color: var(--signal);
  transition: width var(--duration-base) var(--ease);
}

.nav-desktop a:hover::after,
.nav-desktop a:focus-visible::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* Mobile hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  margin-inline: auto;
  background-color: var(--paper);
  transition: transform var(--duration-base) var(--ease), opacity var(--duration-base) var(--ease);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

.nav-mobile {
  position: fixed;
  top: var(--header-height);
  inset-inline: 0;
  background-color: var(--ink);
  border-bottom: 1px solid var(--border);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transform: translateY(-8px);
  opacity: 0;
  visibility: hidden;
  transition: transform var(--duration-base) var(--ease), opacity var(--duration-base) var(--ease),
    visibility var(--duration-base) var(--ease);
  z-index: 99;
}

.nav-mobile.is-open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.nav-mobile a {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--paper);
  padding-block: var(--space-3);
  border-bottom: 1px solid var(--border);
}

/* -----------------------------------------------------------------------------
   7. BUTTONS
----------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: background-color var(--duration-base) var(--ease), border-color var(--duration-base) var(--ease),
    color var(--duration-base) var(--ease), transform var(--duration-fast) var(--ease);
  white-space: nowrap;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background-color: var(--signal);
  color: var(--ink);
  font-weight: 600;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--signal-strong);
}

.btn-secondary {
  background-color: transparent;
  color: var(--paper);
  border-color: var(--border-strong);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: var(--signal);
  color: var(--signal);
}

.btn-ghost {
  background-color: transparent;
  color: var(--fog);
  border-color: var(--border);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  color: var(--paper);
  border-color: var(--border-strong);
}

.btn-block {
  width: 100%;
}

/* -----------------------------------------------------------------------------
   8. HERO + ECOSYSTEM SCHEMATIC DIAGRAM
----------------------------------------------------------------------------- */
.hero {
  padding-top: calc(var(--header-height) + var(--space-24));
  padding-bottom: var(--space-24);
  position: relative;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-16);
  align-items: center;
}

.hero-copy .mono-label {
  display: inline-block;
  margin-bottom: var(--space-4);
}

.hero-copy h1 {
  margin-bottom: var(--space-6);
}

.hero-copy .lede {
  margin-bottom: var(--space-8);
  max-width: 52ch;
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Opening state for the hero — respects reduced-motion via JS/CSS below */
.hero-copy > * {
  opacity: 0;
  transform: translateY(10px);
  animation: hero-in var(--duration-base) var(--ease) forwards;
}
.hero-copy .mono-label { animation-delay: 0ms; }
.hero-copy h1 { animation-delay: 80ms; }
.hero-copy .lede { animation-delay: 160ms; }
.hero-copy .hero-actions { animation-delay: 240ms; }

@keyframes hero-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Ecosystem schematic: TEKVEX → VEX OS / TEKVEX LABS ------------------ */
.schematic {
  border: 1px solid var(--border);
  background-color: var(--surface);
  padding: var(--space-8) var(--space-6);
  position: relative;
}

.schematic-root {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--paper);
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-4);
  border-bottom: 1px dashed var(--border-strong);
}

.schematic-root .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--signal);
  box-shadow: 0 0 8px var(--signal-glow);
}

.schematic-branches {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.schematic-node {
  padding-left: var(--space-6);
  position: relative;
  border-left: 1px solid var(--border-strong);
  padding-bottom: var(--space-4);
}

.schematic-node:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.schematic-node::before {
  content: "";
  position: absolute;
  top: 8px;
  left: -1px;
  width: var(--space-4);
  height: 1px;
  background-color: var(--border-strong);
}

.schematic-node-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--paper);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-1);
}

.schematic-status {
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 1px 6px;
  border-radius: 3px;
  border: 1px solid var(--signal-dim);
  color: var(--signal);
}

.schematic-status.is-building {
  border-color: var(--border-strong);
  color: var(--fog);
}

.schematic-node-desc {
  font-size: 0.8rem;
  color: var(--fog-dim);
  margin-bottom: var(--space-2);
}

.schematic-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.schematic-tags span {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--fog);
  border: 1px solid var(--border);
  padding: 2px 7px;
  border-radius: 3px;
}

/* -----------------------------------------------------------------------------
   9. SECTION HEADERS
----------------------------------------------------------------------------- */
.section-header {
  max-width: 62ch;
  margin-bottom: var(--space-12);
}

.section-header .mono-label {
  display: block;
  margin-bottom: var(--space-3);
}

.section-header h2 {
  margin-bottom: var(--space-4);
}

/* -----------------------------------------------------------------------------
   10. PRODUCT CARDS & GRID
----------------------------------------------------------------------------- */
.product-grid {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.product-card {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  height: 100%;
}

.product-card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-2);
}

.product-card h3 {
  margin: var(--space-2) 0 var(--space-1);
}

.product-card p {
  font-size: 0.92rem;
  flex-grow: 1;
}

.product-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-4);
  margin-top: var(--space-2);
  border-top: 1px solid var(--border);
}

.product-price {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--paper);
}

.product-level {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fog-dim);
}

/* -----------------------------------------------------------------------------
   11. FEATURED PRODUCT PANEL
----------------------------------------------------------------------------- */
.featured-panel {
  padding: var(--space-12);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}

.featured-copy .mono-label {
  margin-bottom: var(--space-3);
  display: block;
}

.featured-copy h3 {
  margin-bottom: var(--space-4);
}

.featured-copy p {
  margin-bottom: var(--space-6);
}

.featured-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.featured-list li {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  font-size: 0.92rem;
  color: var(--fog);
}

.featured-list li::before {
  content: "";
  width: 6px;
  height: 6px;
  background-color: var(--signal);
  flex-shrink: 0;
  transform: translateY(-2px);
}

.featured-price-row {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.featured-price-row .product-price {
  font-size: 1.4rem;
}

.featured-visual {
  border: 1px solid var(--border);
  background: linear-gradient(155deg, var(--surface) 0%, var(--ink) 100%);
  aspect-ratio: 4 / 3;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.featured-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(47, 217, 138, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(47, 217, 138, 0.06) 1px, transparent 1px);
  background-size: 24px 24px;
}

.featured-visual-mark {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fog-dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  z-index: 1;
  border: 1px solid var(--border-strong);
  padding: var(--space-4) var(--space-6);
  background-color: rgba(10, 11, 13, 0.6);
}

/* -----------------------------------------------------------------------------
   12. FOOTER
----------------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: var(--space-16) var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer-brand .brand {
  margin-bottom: var(--space-3);
}

.footer-brand p {
  font-size: 0.9rem;
  max-width: 34ch;
}

.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fog-dim);
  margin-bottom: var(--space-4);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-col a {
  font-size: 0.9rem;
  color: var(--fog);
  transition: color var(--duration-fast) var(--ease);
}

.footer-col a:hover,
.footer-col a:focus-visible {
  color: var(--paper);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-8);
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer-bottom p {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fog-dim);
}

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

.skip-link {
  position: absolute;
  top: -48px;
  left: var(--space-4);
  background-color: var(--signal);
  color: var(--ink);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  z-index: 200;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  transition: top var(--duration-base) var(--ease);
}

.skip-link:focus {
  top: var(--space-4);
}

.whatsapp-fab {
  position: fixed;
  right: var(--space-6);
  bottom: var(--space-6);
  z-index: 90;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background-color: var(--surface);
  border: 1px solid var(--border-strong);
  padding: var(--space-3) var(--space-4);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--paper);
  transition: border-color var(--duration-base) var(--ease), background-color var(--duration-base) var(--ease);
}

.whatsapp-fab:hover,
.whatsapp-fab:focus-visible {
  border-color: var(--signal);
  background-color: var(--surface-raised);
}

.whatsapp-fab .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--signal);
  box-shadow: 0 0 6px var(--signal-glow);
}

/* -----------------------------------------------------------------------------
   14. RESPONSIVE BREAKPOINTS
----------------------------------------------------------------------------- */
@media (max-width: 960px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: var(--space-12);
  }

  .featured-panel {
    grid-template-columns: 1fr;
    padding: var(--space-8);
  }

  .featured-visual {
    order: -1;
    aspect-ratio: 16 / 9;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 720px) {
  .nav-desktop,
  .header-actions .btn-secondary {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .section {
    padding-block: var(--space-16);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .whatsapp-fab span:not(.dot) {
    display: none;
  }

  .whatsapp-fab {
    padding: var(--space-3);
  }
}

@media (max-width: 520px) {
  .container {
    padding-inline: var(--space-4);
  }

  .hero {
    padding-top: calc(var(--header-height) + var(--space-12));
  }

  .hero-actions .btn {
    width: 100%;
  }
}

/* -----------------------------------------------------------------------------
   15. ACCESSIBILITY
----------------------------------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .hero-copy > * {
    opacity: 1;
    transform: none;
  }
}