/* ---------------------------------------------------------------
   Home Network Setup Guide

   Visual direction: Workshop manual / technical field guide
   Palette: Connectivity-focused (teal/cyan) against warm neutrals
   Typography: System fonts (appropriate for Read mode)
   --------------------------------------------------------------- */

:root {
  /* Palette - Light Mode */
  --ink: #1e293b;
  --ink-muted: #4e6175;
  --ink-tertiary: #475569;
  --bg: #fefefe;
  --surface: #f8fafc;
  --surface-raised: #ffffff;
  --rule: #e2e8f0;
  --rule-strong: #cbd5e1;
  --accent: #1e40af;
  --accent-hover: #1e3a8a;
  --accent-ink: #ffffff;
  --accent-light: #dbeafe;

  /* Signal/zone colors for diagrams */
  --signal-strong: #10b981;
  --signal-strong-bg: #d1fae5;
  --signal-good: #1e40af;
  --signal-good-bg: #dbeafe;
  --signal-weak: #f59e0b;
  --signal-weak-bg: #fef3c7;
  --warning-bg: #fef3c7;
  --warning-border: #f59e0b;

  /* Layout */
  --measure: 65ch;
  --content-padding: 2rem;
  --section-gap: 4rem;
  --element-gap: 1.5rem;

  scrollbar-color: var(--rule) transparent;
  caret-color: var(--accent);
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f8fafc;
    --ink-muted: #cbd5e1;
    --ink-tertiary: #cbd5e1;
    --bg: #0f172a;
    --surface: #1e293b;
    --surface-raised: #334155;
    --rule: #334155;
    --rule-strong: #475569;
    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --accent-ink: #0f172a;
    --accent-light: #1e3a8a;

    --signal-strong: #34d399;
    --signal-strong-bg: #064e3b;
    --signal-good: #60a5fa;
    --signal-good-bg: #1e3a8a;
    --signal-weak: #fbbf24;
    --signal-weak-bg: #78350f;
    --warning-bg: #78350f;
    --warning-border: #fbbf24;
  }
}

/* ---------------------------------------------------------------
   Base Styles
   --------------------------------------------------------------- */

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

html {
  overflow-x: clip;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
}

/* ---------------------------------------------------------------
   Typography
   --------------------------------------------------------------- */

p {
  text-wrap: pretty;
  margin: 0 0 1rem;
}

h1,
h2,
h3,
h4,
h5 {
  text-wrap: balance;
  line-height: 1.2;
  font-weight: 600;
  margin: 0;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.875rem;
  letter-spacing: -0.015em;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

h4 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

h5 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

strong {
  font-weight: 600;
  color: var(--ink);
}

code {
  font-family: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--surface);
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
  border: 1px solid var(--rule);
}

/* ---------------------------------------------------------------
   Browser Surfaces (craft floor)
   --------------------------------------------------------------- */

::selection {
  background: var(--accent);
  color: var(--accent-ink);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

a {
  color: var(--accent);
  text-decoration: none;
  text-underline-offset: 0.2em;
  transition: color 150ms ease;
}

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.num {
  font-variant-numeric: tabular-nums;
}

button,
[role="button"],
summary,
input[type="checkbox"],
input[type="radio"] {
  min-height: 44px;
}

button {
  min-width: 44px;
}

img,
video,
canvas,
svg {
  max-width: 100%;
  height: auto;
}

pre {
  overflow-x: auto;
}

table {
  display: block;
  overflow-x: auto;
  max-width: 100%;
}

/* ---------------------------------------------------------------
   Layout
   --------------------------------------------------------------- */

.container {
  max-width: calc(var(--measure) + var(--content-padding) * 2);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--content-padding);
  padding-right: var(--content-padding);
}

/* ---------------------------------------------------------------
   Header (Frame - owns the world)
   --------------------------------------------------------------- */

.site-header {
  background: var(--accent);
  color: var(--accent-ink);
  padding: 3rem 0 2.5rem;
  border-bottom: 4px solid var(--accent-hover);
}

.site-title {
  color: var(--accent-ink);
  margin-bottom: 0.5rem;
}

.site-subtitle {
  font-size: 1.125rem;
  color: var(--accent-ink);
  opacity: 0.9;
  margin: 0;
  max-width: var(--measure);
}

/* ---------------------------------------------------------------
   Table of Contents (Frame - owns the world)
   --------------------------------------------------------------- */

.table-of-contents {
  background: var(--surface);
  border-bottom: 1px solid var(--rule);
  padding: 1.5rem 0;
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
  background: var(--surface) / 0.95;
}

.toc-title {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-muted);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
}

.toc-list li {
  margin: 0;
}

.toc-list a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--ink);
  padding: 0.375rem 0;
  display: inline-block;
}

.toc-list a:hover {
  color: var(--accent);
}

/* ---------------------------------------------------------------
   Main Content (Column - stays calm)
   --------------------------------------------------------------- */

.guide-content {
  padding: 3rem 0 4rem;
}

.guide-section {
  margin-bottom: var(--section-gap);
  scroll-margin-top: 5rem;
}

.guide-section > p,
.guide-section > ul,
.guide-section > ol {
  max-width: var(--measure);
}

.guide-section:last-child {
  margin-bottom: 0;
}

.intro-text {
  font-size: 1.0625rem;
  color: var(--ink);
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--accent);
  border-radius: 0.375rem;
  max-width: var(--measure);
}

.intro-text p:last-child {
  margin-bottom: 0;
}

/* ---------------------------------------------------------------
   Principle Cards
   --------------------------------------------------------------- */

.principle-card {
  background: transparent;
  border: none;
  border-left: 1px solid var(--rule-strong);
  border-radius: 0;
  padding: 1rem 0 1rem 1.5rem;
  margin-bottom: 1.5rem;
  max-width: var(--measure);
}

.principle-card h4 {
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.principle-card p {
  max-width: var(--measure);
}

.principle-card ul {
  max-width: var(--measure);
}

.principle-card p:last-child {
  margin-bottom: 0;
}

.technical-note {
  font-size: 0.9375rem;
  color: var(--ink-muted);
  font-style: italic;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--rule);
  max-width: var(--measure);
}

/* ---------------------------------------------------------------
   Lists
   --------------------------------------------------------------- */

ul,
ol {
  margin: 0 0 1rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
}

li:last-child {
  margin-bottom: 0;
}

.obstacle-list li {
  margin-bottom: 0.75rem;
}

.step-list {
  counter-reset: step-counter;
  list-style: none;
  padding-left: 0;
}

.step-list > li {
  counter-increment: step-counter;
  position: relative;
  padding-left: 3rem;
  margin-bottom: 2rem;
}

.step-list > li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 0;
  width: 2rem;
  height: 2rem;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
}

.step-list > li strong {
  display: block;
  font-size: 1.0625rem;
  margin-bottom: 0.5rem;
}

.step-list > li p {
  color: var(--ink-muted);
  max-width: var(--measure);
}

.step-list > li p:last-child {
  margin-bottom: 0;
}

/* ---------------------------------------------------------------
   Diagram Box (Frame element)
   --------------------------------------------------------------- */

.diagram-box {
  background: transparent;
  border: none;
  border-top: 3px solid var(--accent);
  border-radius: 0;
  padding: 2rem 0;
  margin: 2rem 0;
  max-width: var(--measure);
}

.diagram-box h4 {
  color: var(--accent);
  margin-bottom: 1rem;
}

.diagram-caption {
  font-size: 0.9375rem;
  color: var(--ink-muted);
  margin-bottom: 1.5rem;
  max-width: var(--measure);
}

.coverage-visualization {
  display: grid;
  gap: 1rem;
}

.zone {
  padding: 1.25rem;
  border-radius: 0.5rem;
  border: 2px solid;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.zone-strong {
  background: var(--signal-strong-bg);
  border-color: var(--signal-strong);
}

.zone-good {
  background: var(--signal-good-bg);
  border-color: var(--signal-good);
}

.zone-weak {
  background: var(--signal-weak-bg);
  border-color: var(--signal-weak);
}

.zone-label {
  font-weight: 700;
  font-size: 1.0625rem;
  color: var(--ink);
}

.zone-range {
  font-size: 0.9375rem;
  color: var(--ink-muted);
}

/* ---------------------------------------------------------------
   Frequency Bands
   --------------------------------------------------------------- */

.frequency-band {
  margin: 2rem 0;
  max-width: var(--measure);
}

.frequency-band h4 {
  color: var(--accent);
  margin-bottom: 1rem;
}

.frequency-band p {
  max-width: var(--measure);
}

.frequency-band table {
  max-width: var(--measure);
}

/* ---------------------------------------------------------------
   Channel Grid
   --------------------------------------------------------------- */

.channel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.channel-option {
  background: transparent;
  border: none;
  border-bottom: 2px solid var(--rule);
  border-radius: 0;
  padding: 1.5rem 0;
  text-align: center;
}

.channel-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.75rem;
  font-variant-numeric: tabular-nums;
}

.channel-option p {
  font-size: 0.9375rem;
  color: var(--ink-muted);
  margin: 0;
  max-width: var(--measure);
}

/* ---------------------------------------------------------------
   Tables
   --------------------------------------------------------------- */

.channel-width-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  display: table;
  overflow-x: auto;
  font-size: 0.9375rem;
}

.channel-width-table thead {
  background: var(--surface);
  border-bottom: 2px solid var(--accent);
}

.channel-width-table th {
  text-align: left;
  padding: 0.875rem 1rem;
  font-weight: 600;
  color: var(--ink);
}

.channel-width-table td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--rule);
}

.channel-width-table tbody tr:last-child td {
  border-bottom: none;
}

.channel-width-table tbody tr:hover {
  background: var(--surface);
}

/* ---------------------------------------------------------------
   Control Types
   --------------------------------------------------------------- */

.control-type {
  margin: 2rem 0;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--rule);
  max-width: var(--measure);
}

.control-type:last-of-type {
  border-bottom: none;
  padding-bottom: 0;
}

.control-type h4 {
  color: var(--accent);
}

.control-type p {
  max-width: var(--measure);
}

.implementation-detail {
  font-size: 0.9375rem;
  color: var(--ink-muted);
  background: var(--surface);
  padding: 1rem;
  border: 1px solid var(--rule);
  border-radius: 0.25rem;
  margin-top: 0.75rem;
  max-width: var(--measure);
}

.implementation-detail:last-child {
  margin-bottom: 0;
}

/* ---------------------------------------------------------------
   DNS Services
   --------------------------------------------------------------- */

.dns-services {
  display: grid;
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.dns-option {
  background: transparent;
  border: none;
  border-left: 1px solid var(--accent);
  border-radius: 0;
  padding: 1rem 0 1rem 1.5rem;
  max-width: var(--measure);
}

.dns-option h5 {
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.dns-option p {
  font-size: 0.9375rem;
  margin-bottom: 0.5rem;
}

.dns-option p:last-child {
  margin-bottom: 0;
  color: var(--ink-muted);
}

.dns-option strong {
  color: var(--ink);
}

/* ---------------------------------------------------------------
   Warning Box
   --------------------------------------------------------------- */

.warning-box {
  background: var(--warning-bg);
  border: 2px solid var(--warning-border);
  border-radius: 0.5rem;
  padding: 1.5rem;
  margin: 2rem 0;
  max-width: var(--measure);
}

.warning-box h4 {
  color: var(--ink);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.warning-box h4::before {
  content: "⚠";
  font-size: 1.25rem;
}

.warning-box p,
.warning-box ul {
  color: var(--ink);
  max-width: var(--measure);
}

.warning-box ul {
  margin-bottom: 0;
}

/* ---------------------------------------------------------------
   Security Items
   --------------------------------------------------------------- */

.security-item {
  margin: 2rem 0;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--rule);
  max-width: var(--measure);
}

.security-item:last-of-type {
  border-bottom: none;
  padding-bottom: 0;
}

.security-item h4 {
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.security-item p {
  max-width: var(--measure);
}

.security-item ul {
  max-width: var(--measure);
}

.security-item p strong {
  display: inline-block;
  color: var(--ink);
}

/* ---------------------------------------------------------------
   Troubleshooting Blocks
   --------------------------------------------------------------- */

.troubleshooting-block {
  background: transparent;
  border: none;
  border-top: 2px solid var(--rule);
  border-radius: 0;
  padding: 2rem 0;
  margin: 2rem 0;
  max-width: var(--measure);
}

.troubleshooting-block h4 {
  color: var(--accent);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.troubleshooting-block p {
  max-width: var(--measure);
}

.troubleshooting-block ol {
  margin-bottom: 0;
  max-width: var(--measure);
}

.troubleshooting-block ol li {
  margin-bottom: 1rem;
}

.troubleshooting-block ol li:last-child {
  margin-bottom: 0;
}

/* ---------------------------------------------------------------
   Footer
   --------------------------------------------------------------- */

.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--rule);
  padding: 2.5rem 0;
  margin-top: 4rem;
  color: var(--ink-muted);
  font-size: 0.9375rem;
}

.site-footer p {
  margin-bottom: 0.5rem;
  max-width: var(--measure);
}

.site-footer p:last-child {
  margin-bottom: 0;
}

.footer-meta {
  font-size: 0.875rem;
  color: var(--ink-tertiary);
}

/* ---------------------------------------------------------------
   Responsive
   --------------------------------------------------------------- */

@media (max-width: 768px) {
  :root {
    --content-padding: 1.5rem;
    --section-gap: 3rem;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  .site-header {
    padding: 2rem 0 1.5rem;
  }

  .toc-list {
    flex-direction: column;
    gap: 0.375rem;
  }

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

  .step-list > li {
    padding-left: 2.5rem;
  }

  .step-list > li::before {
    width: 1.75rem;
    height: 1.75rem;
    font-size: 0.8125rem;
  }
}

@media (max-width: 480px) {
  :root {
    --content-padding: 1rem;
  }

  .table-of-contents {
    position: static;
  }

  .diagram-box,
  .troubleshooting-block {
    padding: 1.25rem 0;
  }
}

/* ---------------------------------------------------------------
   Motion
   --------------------------------------------------------------- */

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }

  a,
  .zone {
    transition: all 150ms cubic-bezier(0.4, 0, 0.2, 1);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---------------------------------------------------------------
   Print Styles
   --------------------------------------------------------------- */

@media print {
  body {
    background: #fff;
    color: #000;
    font-size: 11pt;
    line-height: 1.5;
  }

  .site-header {
    background: none;
    color: #000;
    border-bottom: 2px solid #000;
    padding: 1rem 0;
  }

  .site-title {
    color: #000;
  }

  .table-of-contents {
    display: none;
  }

  .guide-section {
    page-break-inside: avoid;
  }

  h2 {
    page-break-after: avoid;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.875em;
  }

  .coverage-visualization,
  .channel-grid,
  .dns-services {
    break-inside: avoid;
  }

  code {
    background: #f0f0f0;
    border: 1px solid #d0d0d0;
  }
}
@media (max-width: 480px) {
  /* --impeccable-mobile-pad */
  body { padding-inline: max(1rem, 16px); }
  .container, [class*="container"], section, header, footer, nav, main, article {
    padding-inline: max(1rem, 16px);
  }
}