/* ABOUTME: Custom design system for pvm.tools — midcentury modern meets VT100.
   ABOUTME: Herman Miller's terminal: Space Mono headings, DM Sans body, IBM Plex Mono code. */

/* ===================================================================
   Design Tokens
   =================================================================== */

:root {
  /* Color palette — light mode */
  --color-bg:           #F5F0E8;  /* Eames house walls, warm cream */
  --color-text:         #2C1810;  /* Teak furniture, deep walnut */
  --color-heading:      #1A1A1A;  /* Typewriter ribbon, charcoal */
  --color-accent:       #4A5D3A;  /* VT100 phosphor, sage olive */
  --color-accent-warm:  #C4652A;  /* Midcentury accent, burnt orange */
  --color-muted:        #9B9185;  /* Linen paper, warm gray */
  --color-border:       #D4C5B2;  /* Wood trim, walnut light */
  --color-code-bg:      #1C2418;  /* Terminal screen, dark olive */
  --color-code-text:    #8FBC6A;  /* Green screen phosphor, warm */
  --color-code-border:  #4A5D3A;  /* Perforation edge, sage */
  --color-card-bg:      #F5F0E8;  /* Same as bg for cards */
  --color-link:         #4A5D3A;  /* Sage olive links */
  --color-link-hover:   #C4652A;  /* Burnt orange on hover */

  /* Typography */
  --font-display: 'Space Mono', 'Courier New', monospace;
  --font-body:    'DM Sans', 'Helvetica Neue', Arial, sans-serif;
  --font-code:    'IBM Plex Mono', 'Menlo', 'Consolas', monospace;

  /* Spacing */
  --container-max:   64rem;
  --container-pad:   2rem;
  --section-gap:     4rem;
  --grid-gap:        1.5rem;

  /* Borders */
  --border-thin:     1px solid var(--color-border);
  --border-accent:   4px solid var(--color-border);
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg:          #1A1410;
    --color-text:        #E8E0D4;
    --color-heading:     #F5F0E8;
    --color-accent:      #8FBC6A;
    --color-accent-warm: #E07840;
    --color-muted:       #7A7068;
    --color-border:      #3D3428;
    --color-code-bg:     #0F1A0A;
    --color-code-text:   #8FBC6A;
    --color-code-border: #4A5D3A;
    --color-card-bg:     #221C14;
    --color-link:        #8FBC6A;
    --color-link-hover:  #E07840;
  }
}

/* ===================================================================
   Reset & Base
   =================================================================== */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===================================================================
   Typography
   =================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--color-heading);
  line-height: 1.2;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

h1:first-child,
h2:first-child,
h3:first-child {
  margin-top: 0;
}

p {
  margin-bottom: 1rem;
}

a {
  color: var(--color-link);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

a:hover {
  color: var(--color-link-hover);
  border-bottom-color: var(--color-link-hover);
}

strong {
  font-weight: 700;
}

ul, ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.25rem;
}

/* ===================================================================
   Layout — Swiss grid container
   =================================================================== */

main {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  width: 100%;
  flex: 1;
}

section {
  margin-bottom: var(--section-gap);
}

/* Section dividers — thin walnut rule, offset for asymmetry */
section + section {
  padding-top: var(--section-gap);
  border-top: 1px solid var(--color-border);
  margin-left: 2rem;
}

/* ===================================================================
   Navigation
   =================================================================== */

header {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 1.5rem var(--container-pad);
  width: 100%;
}

nav {
  display: flex;
  align-items: center;
  gap: 0;
  font-family: var(--font-display);
  font-size: 0.875rem;
}

nav .site-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-heading);
  text-decoration: none;
  border-bottom: none;
  margin-right: 2rem;
  letter-spacing: 0.05em;
}

nav .site-name:hover {
  color: var(--color-accent);
  border-bottom: none;
}

nav .nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: 0;
}

nav .nav-links li {
  margin: 0;
}

nav .nav-links a {
  color: var(--color-muted);
  text-decoration: none;
  border-bottom: none;
  padding: 0.25rem 0;
}

nav .nav-links a:hover,
nav .nav-links a[aria-current="page"] {
  color: var(--color-heading);
}

nav .nav-links a[aria-current="page"] {
  border-bottom: 2px solid var(--color-accent);
}

/* Pipe separators between nav links */
nav .nav-links li + li::before {
  content: "|";
  color: var(--color-border);
  padding: 0 0.75rem;
  font-weight: 300;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--color-heading);
  font-size: 1.5rem;
  line-height: 1;
  font-family: var(--font-display);
  margin-left: auto;
}

@media (max-width: 768px) {
  nav {
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: block;
  }

  nav .nav-links {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    padding-top: 1rem;
    border-top: var(--border-thin);
    margin-top: 1rem;
  }

  nav .nav-links.open {
    display: flex;
  }

  nav .nav-links li + li::before {
    content: none;
  }

  nav .nav-links li {
    width: 100%;
  }

  nav .nav-links a {
    display: block;
    padding: 0.5rem 0;
  }

  /* Remove asymmetric section offset on mobile */
  section + section {
    margin-left: 0;
  }
}

/* ===================================================================
   Code Blocks — dark olive slab with phosphor text
   =================================================================== */

code {
  font-family: var(--font-code);
  font-size: 0.875em;
}

/* Inline code */
:not(pre) > code {
  background: var(--color-code-bg);
  color: var(--color-code-text);
  padding: 0.15em 0.4em;
  font-size: 0.85em;
}

/* Block code — the terminal slab */
pre {
  background: var(--color-code-bg);
  color: var(--color-code-text);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
  overflow-x: auto;
  position: relative;
  font-family: var(--font-code);
  font-size: 0.875rem;
  line-height: 1.6;
  border: none;
  border-radius: 0;

  /* Perforation-edge left border */
  border-left: 3px solid var(--color-code-border);
  background-image: repeating-linear-gradient(
    to bottom,
    transparent,
    transparent 8px,
    var(--color-code-bg) 8px,
    var(--color-code-bg) 10px
  );
  background-size: 3px 18px;
  background-repeat: repeat-y;
  background-position: left;
}

pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: inherit;
}

/* Copy button */
.copy-btn {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  padding: 0.2rem 0.6rem;
  font-size: 0.7rem;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
  background: transparent;
  border: 1px solid var(--color-muted);
  color: var(--color-muted);
}

.copy-btn:hover {
  color: var(--color-accent-warm);
  border-color: var(--color-accent-warm);
}

/* ===================================================================
   Hero Section
   =================================================================== */

.hero {
  text-align: center;
  padding: 4rem 0 3rem;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: 4rem;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
  color: var(--color-heading);
}

.hero .tagline {
  font-family: var(--font-body);
  font-size: 1.3rem;
  color: var(--color-muted);
  margin-bottom: 0.5rem;
}

.hero p {
  color: var(--color-muted);
}

/* Install block */
.install-block {
  max-width: 42rem;
  margin: 2rem auto;
  text-align: left;
}

/* Platform tabs */
.platform-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--color-border);
}

.platform-tabs [role="tab"] {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--color-muted);
  margin-bottom: -1px;
}

.platform-tabs [role="tab"][aria-selected="true"] {
  color: var(--color-heading);
  border-bottom-color: var(--color-accent);
}

.platform-tabs [role="tab"]:hover {
  color: var(--color-heading);
}

[role="tabpanel"] pre {
  margin-top: 0;
}

/* CTA buttons */
.cta-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.cta-group a {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.75rem 2rem;
  border: 2px solid var(--color-heading);
  color: var(--color-heading);
  text-decoration: none;
  border-bottom: 2px solid var(--color-heading);
}

.cta-group a:hover {
  background: var(--color-heading);
  color: var(--color-bg);
  border-bottom-color: var(--color-heading);
}

.cta-group a.primary {
  background: var(--color-heading);
  color: var(--color-bg);
}

.cta-group a.primary:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

/* ===================================================================
   Tool Cards — specification sheets on a drafting table
   =================================================================== */

.tool-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--grid-gap);
  margin: 2rem 0;
}

.tool-card {
  padding: 1.5rem;
  border-left: var(--border-accent);
  background: var(--color-card-bg);
}

.tool-card h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-top: 0;
  margin-bottom: 0.25rem;
  color: var(--color-heading);
}

.tool-card > p:first-of-type {
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}

.tool-card pre {
  margin-bottom: 0;
  font-size: 0.8rem;
}

@media (max-width: 768px) {
  .tool-grid {
    grid-template-columns: 1fr;
  }
}

/* ===================================================================
   Selling Points — three-column grid
   =================================================================== */

.selling-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin: 2rem 0;
}

.selling-points h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  margin-top: 0;
}

@media (max-width: 768px) {
  .selling-points {
    grid-template-columns: 1fr;
  }
}

/* ===================================================================
   Tables — clean walnut borders, no zebra
   =================================================================== */

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}

th, td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: var(--border-thin);
}

th {
  font-family: var(--font-display);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
  border-bottom: 2px solid var(--color-border);
}

td:first-child {
  font-family: var(--font-display);
  font-size: 0.85rem;
  white-space: nowrap;
}

/* ===================================================================
   Definition Lists — Space Mono terms, DM Sans descriptions
   =================================================================== */

dl {
  margin-bottom: 1.5rem;
}

dt {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-heading);
  margin-top: 1rem;
}

dt:first-child {
  margin-top: 0;
}

dd {
  margin-left: 0;
  margin-bottom: 1rem;
  padding-left: 1.5rem;
  border-left: 2px solid var(--color-border);
}

/* ===================================================================
   Footer
   =================================================================== */

footer {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 2rem var(--container-pad);
  width: 100%;
  border-top: 1px solid var(--color-border);
  margin-top: var(--section-gap);
}

footer p {
  font-family: var(--font-display);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
}

footer a {
  color: var(--color-muted);
}

footer a:hover {
  color: var(--color-accent-warm);
}