/* ============================================
   WhyNotLab — Design System Implementation
   ============================================ */

/* --- Custom Properties --- */
:root {
  --color-black: #0A0A0A;
  --color-white: #FAFAFA;
  --color-gray-900: #1A1A1A;
  --color-gray-700: #3D3D3D;
  --color-gray-400: #9E9E9E;
  --color-gray-200: #E0E0E0;
  --color-gray-100: #F0F0F0;
  --color-accent: #2A4BF2;
  --color-accent-subtle: #2A4BF210;

  --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;

  --container-max: 1200px;
  --container-narrow: 720px;
  --container-padding: clamp(1.5rem, 5vw, 4rem);

  --ease-technical: cubic-bezier(0.16, 1, 0.3, 1);

  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

/* --- Base --- */
html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-black);
  background-color: var(--color-gray-100);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
  overflow-x: hidden;
}

/* --- Grid Background --- */
.grid-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--color-gray-200) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-gray-200) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.5;
}

/* --- Side Annotations --- */
.side-annotations {
  position: fixed;
  left: 14px;
  top: 0;
  bottom: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  pointer-events: none;
}

.side-annotation {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  color: var(--color-gray-400);
  letter-spacing: 0.05em;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  transform: rotate(180deg);
}

/* --- Header --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  border-bottom: 1px solid var(--color-gray-200);
  backdrop-filter: blur(12px);
  background: rgba(240, 240, 240, 0.85);
}

.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-3) var(--container-padding);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: block;
  color: var(--color-black);
  text-decoration: none;
}

.logo-svg {
  height: 36px;
  width: auto;
  color: var(--color-black);
}

.logo-svg text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 12px;
  fill: currentColor;
  letter-spacing: 0.08em;
}

.logo-text-lab {
  letter-spacing: 0.12em;
}

/* --- Language Switch --- */
.lang-switch {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

.lang-btn {
  background: none;
  border: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-gray-400);
  cursor: pointer;
  padding: var(--space-1) var(--space-2);
  letter-spacing: 0.05em;
  position: relative;
  transition: color 150ms ease;
}

.lang-btn.active {
  color: var(--color-black);
}

.lang-btn.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: var(--space-2);
  right: var(--space-2);
  height: 1.5px;
  background: var(--color-accent);
}

.lang-btn:hover {
  color: var(--color-black);
}

.lang-sep {
  color: var(--color-gray-400);
}

/* --- Section Number --- */
.section-number {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.12em;
  color: var(--color-gray-400);
  margin-bottom: var(--space-4);
  text-transform: uppercase;
}

/* --- Section Label --- */
.section-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-gray-700);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-gray-200);
  display: inline-block;
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: calc(var(--space-16) + 2rem) var(--container-padding) var(--space-4);
  position: relative;
  z-index: 1;
}

.hero-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  width: 100%;
  position: relative;
  padding: var(--space-8) var(--space-8);
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 400ms var(--ease-technical), transform 400ms var(--ease-technical);
}

.hero-inner.in-view {
  opacity: 1;
  transform: translateY(0);
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.75rem, 6.5vw, 5rem);
  line-height: 0.92;
  letter-spacing: -0.03em;
  text-transform: uppercase;
  max-width: 12ch;
  margin-bottom: var(--space-6);
}

.hero-subtitle {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1rem, 1.6vw, 1.1875rem);
  line-height: 1.6;
  color: var(--color-gray-700);
  max-width: 48ch;
}

/* Hero illustration */
.hero-illustration {
  position: absolute;
  bottom: var(--space-4);
  right: var(--space-4);
  width: clamp(80px, 10vw, 120px);
  color: var(--color-gray-700);
  opacity: 0.25;
}

.hero-illustration svg {
  width: 100%;
  height: auto;
}

/* --- Crop Marks --- */
.crop-mark {
  position: absolute;
  width: 24px;
  height: 24px;
  pointer-events: none;
}

.crop-mark::before,
.crop-mark::after {
  content: '';
  position: absolute;
  background: var(--color-gray-700);
  transition: background 400ms var(--ease-technical);
}

.in-view .crop-mark::before,
.in-view .crop-mark::after {
  background: var(--color-gray-700);
}

.crop-mark--tl { top: -1px; left: -1px; }
.crop-mark--tl::before { top: 0; left: 0; width: 24px; height: 1px; }
.crop-mark--tl::after  { top: 0; left: 0; width: 1px; height: 24px; }

.crop-mark--tr { top: -1px; right: -1px; }
.crop-mark--tr::before { top: 0; right: 0; width: 24px; height: 1px; }
.crop-mark--tr::after  { top: 0; right: 0; width: 1px; height: 24px; }

.crop-mark--bl { bottom: -1px; left: -1px; }
.crop-mark--bl::before { bottom: 0; left: 0; width: 24px; height: 1px; }
.crop-mark--bl::after  { bottom: 0; left: 0; width: 1px; height: 24px; }

.crop-mark--br { bottom: -1px; right: -1px; }
.crop-mark--br::before { bottom: 0; right: 0; width: 24px; height: 1px; }
.crop-mark--br::after  { bottom: 0; right: 0; width: 1px; height: 24px; }

/* --- Dimension Lines --- */
.dimension-line {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-2) var(--container-padding);
  position: relative;
  z-index: 1;
}

.dimension-line::before {
  content: '';
  position: absolute;
  left: var(--container-padding);
  right: var(--container-padding);
  top: 50%;
  height: 1px;
  border-top: 1px dashed var(--color-gray-400);
  opacity: 0.5;
}

.dimension-line::after {
  content: '';
  position: absolute;
  left: var(--container-padding);
  top: calc(50% - 2px);
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-gray-400);
  opacity: 0.5;
}

.dimension-label {
  position: relative;
  z-index: 1;
  display: inline-block;
  margin-left: calc(50% - 3em);
  background: var(--color-gray-100);
  padding: 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.08em;
  color: var(--color-gray-400);
}

/* --- About --- */
.about {
  padding: var(--space-8) var(--container-padding);
  position: relative;
  z-index: 1;
}

.about .section-inner {
  max-width: var(--container-narrow);
  margin: 0 auto;
  position: relative;
  padding: var(--space-6) var(--space-8);
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 400ms var(--ease-technical), transform 400ms var(--ease-technical);
}

.about .section-inner.in-view {
  opacity: 1;
  transform: translateY(0);
}

.about-text {
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.7;
  color: var(--color-gray-900);
  max-width: 62ch;
  margin-bottom: var(--space-4);
}

.about-text--secondary {
  margin-bottom: 0;
  color: var(--color-gray-700);
  padding-left: var(--space-4);
  border-left: 2px solid var(--color-accent);
}

/* --- Work Areas --- */
.areas {
  padding: var(--space-8) var(--container-padding);
  position: relative;
  z-index: 1;
}

.areas .section-inner {
  max-width: var(--container-max);
  margin: 0 auto;
}

.areas-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--color-gray-200);
  border: 1px solid var(--color-gray-200);
}

.area-card {
  padding: var(--space-4) var(--space-6);
  background: var(--color-white);
  position: relative;
  overflow: hidden;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 400ms var(--ease-technical), transform 400ms var(--ease-technical),
              background 150ms ease;
}

.area-card.in-view {
  opacity: 1;
  transform: translateY(0);
}

.area-card:hover {
  background: var(--color-gray-100);
}

.area-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}

.area-marker {
  width: 8px;
  height: 8px;
  border: 1.5px solid var(--color-gray-700);
  transition: background 250ms var(--ease-technical), border-color 250ms var(--ease-technical);
}

.area-card:hover .area-marker {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.area-index {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  color: var(--color-gray-400);
  letter-spacing: 0.05em;
}

/* Area illustrations */
.area-illustration {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  width: 70px;
  color: var(--color-gray-700);
  opacity: 0.15;
  pointer-events: none;
  transition: opacity 250ms var(--ease-technical);
}

.area-card:hover .area-illustration {
  opacity: 0.35;
}

.area-illustration svg {
  width: 100%;
  height: auto;
}

.area-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.125rem, 1.8vw, 1.375rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-2);
}

.area-desc {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--color-gray-700);
  letter-spacing: 0.01em;
}

/* --- Contact --- */
.contact {
  padding: var(--space-12) var(--container-padding);
  text-align: center;
  position: relative;
  z-index: 1;
}

.contact .section-inner {
  max-width: var(--container-narrow);
  margin: 0 auto;
  position: relative;
  padding: var(--space-8) var(--space-8);
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
}

.contact-text {
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.6;
  color: var(--color-gray-700);
  margin-bottom: var(--space-6);
}

.contact-email {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2.2vw, 1.375rem);
  color: var(--color-black);
  text-decoration: none;
  position: relative;
  padding: var(--space-3) var(--space-6);
  border: 1px solid var(--color-black);
  display: inline-block;
  transition: background 150ms ease, color 150ms ease;
}

.contact-email:hover {
  background: var(--color-black);
  color: var(--color-white);
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--color-gray-200);
  padding: var(--space-4) var(--container-padding);
  position: relative;
  z-index: 1;
  background: var(--color-gray-100);
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-gray-700);
  letter-spacing: 0.05em;
}

.footer-status {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--color-gray-400);
  letter-spacing: 0.08em;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.status-bracket {
  color: var(--color-gray-400);
}

.status-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: pulse 2s ease infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .areas-grid {
    grid-template-columns: 1fr;
  }

  .area-card {
    padding: var(--space-4);
  }

  .hero {
    padding-top: calc(var(--space-12) + 2rem);
  }

  .hero-inner {
    padding: var(--space-8) var(--space-4);
  }

  .hero-title {
    max-width: 100%;
  }

  .hero-illustration {
    position: absolute;
    bottom: var(--space-3);
    right: var(--space-3);
    width: 60px;
    opacity: 0.3;
  }

  .side-annotations {
    display: none;
  }

  .area-illustration {
    width: 50px;
  }
}

@media (max-width: 640px) {
  .footer-inner {
    flex-direction: column;
    gap: var(--space-2);
    text-align: center;
  }
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  .hero-inner,
  .about .section-inner,
  .area-card {
    opacity: 1;
    transform: none;
  }

  .status-dot {
    animation: none;
    opacity: 1;
  }
}