/* ============================================================
   4BIT.SPACE — V2 RETRO BEIGE / SWISS BRUTALIST DESIGN SYSTEM
   ============================================================ */

/* --- Design Tokens --- */
:root {
  --surface:       #F4F3EE;
  --surface-alt:   #EBE8E0;
  --ink:           #1A1A1A;
  --ink-muted:     #5A5A5A;
  --accent:        #D35400;
  --accent-hover:  #B84700;
  --border:        2px solid #1A1A1A;
  --border-light:  1px solid #C8C5BC;
  --shadow-hard:   4px 4px 0px #1A1A1A;
  --shadow-hover:  2px 2px 0px #1A1A1A;
  --font-body:     'Inter', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono:     'JetBrains Mono', 'SF Mono', 'Consolas', monospace;
  --max-width:     1120px;
  --space-xs:      8px;
  --space-sm:      16px;
  --space-md:      32px;
  --space-lg:      56px;
  --space-xl:      80px;
  --space-xxl:     120px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  background: var(--surface);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  min-height: 100vh;
}

/* --- Typography Scale --- */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  margin-bottom: var(--space-md);
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  margin-bottom: var(--space-sm);
}

h3 {
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-xs);
}

p {
  font-size: 1.05rem;
  max-width: 640px;
  margin-bottom: var(--space-sm);
  color: var(--ink-muted);
}

a {
  color: var(--ink);
  text-decoration: none;
}

/* --- Layout --- */
.site-frame {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-xl) 0;
  border-bottom: var(--border);
}

.section:last-child {
  border-bottom: none;
}

/* --- Grid System --- */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

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

.panel-main {
  grid-column: span 2;
}

.panel-sidebar {
  grid-column: span 1;
}

.panel-full {
  grid-column: 1 / -1;
}

/* --- Header / Navigation --- */
.site-header {
  border-bottom: var(--border);
  padding: var(--space-sm) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface);
  transition: padding 0.25s ease;
}

.site-header.scrolled {
  padding: 6px 0;
  box-shadow: 0 1px 0 rgba(26,26,26,0.1);
}

.site-header .site-frame {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.logo span {
  color: var(--accent);
}

/* --- Logo Container (Architectural SVG) --- */
.logo-container {
  height: 66px;
  width: auto;
  display: flex;
  align-items: center;
  flex-shrink: 0;
  transition: height 0.25s ease;
}

.site-header.scrolled .logo-container {
  height: 36px;
}

.logo-container a {
  display: block;
  width: 100%;
}

.logo-container svg {
  shape-rendering: crispEdges;
  text-rendering: optimizeLegibility;
}

.nav-links {
  display: flex;
  gap: var(--space-md);
  align-items: center;
  list-style: none;
}

.nav-links a {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: var(--space-xs) 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.15s ease;
}

.nav-links a:hover {
  border-bottom-color: var(--ink);
}

/* --- Buttons (Tactile Hardware Style) --- */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 14px 28px;
  border: var(--border);
  background: var(--accent);
  color: #FFFFFF;
  cursor: pointer;
  box-shadow: var(--shadow-hard);
  transition: all 0.1s ease;
  text-decoration: none;
}

.btn:hover {
  box-shadow: var(--shadow-hover);
  transform: translate(2px, 2px);
}

.btn:active {
  box-shadow: none;
  transform: translate(4px, 4px);
}

.btn-outline {
  background: transparent;
  color: var(--ink);
}

.btn-outline:hover {
  background: var(--ink);
  color: var(--surface);
}

/* --- Cards (Hard-border Panels) --- */
.card {
  border: var(--border);
  padding: var(--space-md);
  background: var(--surface);
  position: relative;
}

.card-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-muted);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.card h3 {
  margin-bottom: var(--space-xs);
}

.card p {
  font-size: 0.95rem;
}

/* --- Hero --- */
.hero {
  padding: var(--space-xxl) 0 var(--space-xl);
  border-bottom: var(--border);
}

.hero h1 {
  max-width: 720px;
}

.hero p {
  font-size: 1.15rem;
  max-width: 580px;
  margin-bottom: var(--space-md);
}

/* --- Data Tables --- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.data-table th,
.data-table td {
  text-align: left;
  padding: var(--space-sm);
  border-bottom: var(--border-light);
  vertical-align: top;
}

.data-table th {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-muted);
  border-bottom: var(--border);
}

.data-table tr:last-child td {
  border-bottom: none;
}

/* --- Form Elements (Thick-border Terminal) --- */
.form-group {
  margin-bottom: var(--space-md);
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-xs);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  font-family: var(--font-body);
  font-size: 1rem;
  background: var(--surface);
  color: var(--ink);
  border: var(--border);
  outline: none;
  transition: box-shadow 0.15s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  box-shadow: var(--shadow-hard);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* --- Alert / Notice --- */
.notice {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: var(--space-sm);
  border: var(--border);
  background: var(--surface-alt);
  margin-bottom: var(--space-md);
  letter-spacing: 0.04em;
}

.notice-warn {
  border-left: 6px solid var(--accent);
}

/* --- Footer --- */
.site-footer {
  border-top: var(--border);
  padding: var(--space-lg) 0 var(--space-md);
}

.site-footer .site-frame {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.footer-legal {
  font-size: 0.78rem;
  color: var(--ink-muted);
}

.footer-links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
}

.footer-links a {
  font-size: 0.78rem;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: color 0.15s ease;
}

.footer-links a:hover {
  color: var(--ink);
}

/* --- Utility --- */
.mt-xs  { margin-top: var(--space-xs); }
.mt-sm  { margin-top: var(--space-sm); }
.mt-md  { margin-top: var(--space-md); }
.mt-lg  { margin-top: var(--space-lg); }
.mb-md  { margin-bottom: var(--space-md); }
.text-muted { color: var(--ink-muted); }
.text-mono  { font-family: var(--font-mono); font-size: 0.85rem; }

/* --- Responsive: Tablet --- */
@media (max-width: 1024px) {
  .logo-container { height: 56px; }
  .site-header.scrolled .logo-container { height: 32px; }
  .nav-links { gap: var(--space-sm); }
}

/* --- Responsive: Mobile --- */
@media (max-width: 768px) {
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .panel-main   { grid-column: span 1; }
  .panel-sidebar { grid-column: span 1; }

  .site-header .site-frame {
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
  }

  .logo-container { height: 48px; }
  .site-header.scrolled .logo-container { height: 28px; }

  .nav-links {
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
    width: 100%;
  }

  .hero { padding: var(--space-xl) 0 var(--space-lg); }
}

/* --- Responsive: Small Mobile --- */
@media (max-width: 480px) {
  .site-frame { padding: 0 var(--space-sm); }
  .logo-container { height: 40px; }
  .site-header.scrolled .logo-container { height: 24px; }

  .nav-links a {
    font-size: 0.75rem;
    letter-spacing: 0.06em;
  }

  .btn {
    padding: 10px 18px;
    font-size: 0.75rem;
  }
}