/* ==========================================================================
   SYS.LAB — Portfolio & Homelab Stylesheet
   Architecture:
   1. Design Variables (Custom Properties)
   2. Base Normalization (Reset)
   3. Global Styles & Typography
   4. Containers & Layout Distribution
   5. Reusable Components
   6. Section-Specific Styles
   7. Interaction States & Accessibility
   8. Media Queries & User Preferences
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Variables (Custom Properties)
   -------------------------------------------------------------------------- */
:root {
  color-scheme: dark;

  /* Surfaces (Charcoal Dark Palette) */
  --bg-base: #0d1117;
  --bg-surface: #141a23;
  --bg-elevated: #1b2330;
  --bg-subtle: #212b3a;

  /* Text Colors (WCAG AA/AAA verified against dark surfaces) */
  --text-primary: #f0f6fc;
  --text-secondary: #c2ccd6;
  --text-muted: #98a4b3;

  /* Accents (Terminal Green primary, Discreet Cyan-Blue secondary) */
  --accent-primary: #4ac26b;
  --accent-primary-bright: #6fdd8b;
  --accent-primary-subtle: rgba(74, 194, 107, 0.14);
  --accent-secondary: #6cb6ff;
  --accent-secondary-subtle: rgba(108, 182, 255, 0.14);

  /* Status Colors */
  --status-implemented-bg: rgba(74, 194, 107, 0.14);
  --status-implemented-border: #3fb950;
  --status-implemented-text: #7ee787;

  --status-planned-bg: rgba(108, 182, 255, 0.13);
  --status-planned-border: #58a6ff;
  --status-planned-text: #a5d6ff;

  /* Borders & Dividers */
  --border-subtle: #273244;
  --border-default: #334155;
  --border-strong: #475569;

  /* Typography (System Fonts Only) */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;

  /* Type Scale */
  --text-xs: 0.8125rem;
  --text-sm: 0.9375rem;
  --text-base: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  --text-lg: clamp(1.0625rem, 1rem + 0.35vw, 1.2rem);
  --text-xl: clamp(1.2rem, 1.1rem + 0.5vw, 1.4rem);
  --text-2xl: clamp(1.45rem, 1.25rem + 0.9vw, 1.95rem);
  --text-3xl: clamp(1.9rem, 1.5rem + 2vw, 2.85rem);

  /* Line Heights */
  --leading-tight: 1.22;
  --leading-snug: 1.38;
  --leading-normal: 1.65;

  /* Spacing Scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3.25rem;
  --space-16: 4.5rem;

  /* Layout Constraints */
  --container-max: 72rem;
  --measure-reading: 66ch;

  /* Borders, Radii & Shadows */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --shadow-card: 0 4px 14px rgba(0, 0, 0, 0.28);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
}

/* --------------------------------------------------------------------------
   2. Base Normalization (Reset)
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-8);
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  background-color: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  text-rendering: optimizeLegibility;
}

ul,
ol {
  list-style: none;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

/* --------------------------------------------------------------------------
   3. Global Styles & Typography
   -------------------------------------------------------------------------- */
h1,
h2,
h3,
h4 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: var(--leading-tight);
  letter-spacing: -0.015em;
  overflow-wrap: break-word;
}

h1 {
  font-size: var(--text-3xl);
}

h2 {
  font-size: var(--text-2xl);
}

h3 {
  font-size: var(--text-xl);
}

h4 {
  font-size: var(--text-lg);
}

p,
li,
dd,
dt {
  overflow-wrap: break-word;
}

p {
  color: var(--text-secondary);
  max-width: var(--measure-reading);
}

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

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: var(--bg-subtle);
  color: var(--accent-primary-bright);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  overflow-wrap: anywhere;
}

a {
  color: var(--accent-secondary);
  text-decoration: underline;
  text-underline-offset: 0.22em;
  text-decoration-thickness: 1px;
  transition: color var(--transition-fast),
    background-color var(--transition-fast),
    border-color var(--transition-fast);
}

/* Ensure anchor targets never sit flush against top of viewport */
section[id],
header[id],
main[id] {
  scroll-margin-top: var(--space-8);
}

/* --------------------------------------------------------------------------
   4. Containers & Layout Distribution
   -------------------------------------------------------------------------- */
.header-inner,
.site-main,
.footer-inner {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.site-main {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
  padding-block: var(--space-8) var(--space-16);
}

.content-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  padding-top: var(--space-8);
  border-top: 1px solid var(--border-subtle);
}

/* --------------------------------------------------------------------------
   5. Reusable Components
   -------------------------------------------------------------------------- */

/* Section Header & Terminal Code Label */
.section-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.section-code {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--accent-primary-bright);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.section-intro {
  color: var(--text-secondary);
  font-size: var(--text-lg);
  max-width: var(--measure-reading);
  margin-top: var(--space-1);
}

/* Cards & Content Blocks */
.about-block,
.homelab-card,
.project-article,
.stack-category {
  min-width: 0;
  max-width: 100%;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  box-shadow: var(--shadow-card);
}

/* Bulleted Technical Detail Lists */
.detail-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.detail-list li {
  position: relative;
  padding-left: var(--space-5);
  color: var(--text-secondary);
  max-width: var(--measure-reading);
}

.detail-list li::before {
  content: ">";
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-primary);
}

/* Status Badges (Implemented vs Planned) */
.status-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.status-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-width: 0;
  max-width: 100%;
  gap: var(--space-1);
  padding: var(--space-4);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

.status-badge {
  display: inline-block;
  max-width: 100%;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  line-height: 1.3;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-1);
  overflow-wrap: anywhere;
}

.status-implemented {
  background-color: var(--status-implemented-bg);
  border: 1px solid var(--status-implemented-border);
  color: var(--status-implemented-text);
}

.status-planned {
  background-color: var(--status-planned-bg);
  border: 1px dashed var(--status-planned-border);
  color: var(--status-planned-text);
}

/* Description Lists (<dl>) for Hardware & Network Specs */
.spec-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.spec-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--border-subtle);
}

.spec-item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.spec-item dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.spec-item dd {
  color: var(--text-primary);
  font-size: var(--text-base);
}

/* Technology Tags */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag-list li {
  max-width: 100%;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  background-color: var(--bg-subtle);
  color: var(--text-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: 0.3rem 0.65rem;
  overflow-wrap: anywhere;
}

/* Action Buttons / CTA Links */
.action-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  max-width: 100%;
  min-height: 2.75rem;
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  overflow-wrap: anywhere;
}

.action-primary {
  background-color: var(--accent-primary);
  color: var(--bg-base);
  border-color: var(--accent-primary);
}

.action-secondary {
  background-color: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

/* --------------------------------------------------------------------------
   6. Section-Specific Styles
   -------------------------------------------------------------------------- */

/* A. Header, Navigation & Language Switcher */
.site-header {
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-default);
  padding-block: var(--space-4);
}

.header-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-4);
}

.site-brand {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2);
  text-decoration: none;
  padding-block: var(--space-1);
}

.brand-name {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.03em;
}

.brand-name::before {
  content: "~/";
  color: var(--accent-primary);
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.site-nav {
  width: 100%;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  min-height: 2.5rem;
  padding: var(--space-1) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  text-decoration: none;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  overflow-wrap: anywhere;
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background-color: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  width: 100%;
  max-width: 100%;
}

.lang-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

.lang-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  max-width: 100%;
  min-height: 2.15rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  cursor: pointer;
  overflow-wrap: anywhere;
  transition: color var(--transition-fast),
    background-color var(--transition-fast),
    border-color var(--transition-fast);
}

.lang-button[aria-pressed="true"],
.lang-button.is-active {
  color: var(--accent-primary-bright);
  background-color: var(--accent-primary-subtle);
  border-color: var(--status-implemented-border);
}

.lang-button:disabled {
  cursor: not-allowed;
  border-style: dashed;
  color: var(--text-muted);
  opacity: 0.85;
}

.lang-button[aria-pressed="true"]:disabled {
  border-style: solid;
  color: var(--accent-primary-bright);
}

.lang-notice {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-secondary);
  overflow-wrap: anywhere;
}

.lang-notice.is-error {
  color: var(--status-planned-text);
}

/* B. Hero Section */
.hero-section {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-width: 0;
  max-width: 100%;
  gap: var(--space-4);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-left: 4px solid var(--accent-primary);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  box-shadow: var(--shadow-card);
}

.terminal-prompt {
  max-width: 100%;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--accent-primary-bright);
  background-color: var(--bg-base);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  overflow-wrap: anywhere;
}

.hero-lead {
  font-size: var(--text-lg);
  color: var(--text-primary);
  max-width: var(--measure-reading);
}

.hero-context {
  color: var(--text-secondary);
  max-width: var(--measure-reading);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-2);
  width: 100%;
}

/* C. About Section */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

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

/* D. Homelab Section */
.homelab-blocks {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

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

/* E. Projects Section */
.project-article {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  border-top: 3px solid var(--accent-primary);
}

.project-header {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2);
}

.project-status {
  max-width: 100%;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--status-implemented-text);
  background-color: var(--status-implemented-bg);
  border: 1px solid var(--status-implemented-border);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  overflow-wrap: anywhere;
}

.project-description {
  font-size: var(--text-lg);
  color: var(--text-secondary);
}

.project-details {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

.project-subsection {
  display: flex;
  flex-direction: column;
  min-width: 0;
  max-width: 100%;
  gap: var(--space-3);
  padding: var(--space-5);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

.project-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.project-links a {
  display: inline-flex;
  align-items: center;
  min-height: 2.5rem;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  overflow-wrap: anywhere;
}

/* F. Stack Section */
.stack-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

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

/* G. Contact & Footer */
.contact-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.contact-list a {
  display: flex;
  align-items: center;
  min-height: 3.25rem;
  padding: var(--space-4) var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-left: 3px solid var(--accent-secondary);
  border-radius: var(--radius-md);
  text-decoration: none;
  overflow-wrap: anywhere;
}

.site-footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-default);
  padding-block: var(--space-8);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-identity {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-primary);
}

.footer-copyright {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.footer-links {
  margin-top: var(--space-1);
}

.footer-links a {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

/* --------------------------------------------------------------------------
   7. Interaction States & Accessibility
   -------------------------------------------------------------------------- */

/* Skip Link: visually hidden at rest, high-contrast banner when focused */
.skip-link {
  position: absolute;
  top: -10rem;
  left: var(--space-4);
  z-index: 1000;
  background-color: var(--accent-primary);
  color: var(--bg-base);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-sm);
  text-decoration: none;
  box-shadow: var(--shadow-card);
}

.skip-link:focus,
.skip-link:focus-visible {
  top: var(--space-3);
}

/* Keyboard Focus Ring */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent-primary-bright);
  outline-offset: 3px;
}

/* Hover & Focus States */
a:hover {
  color: var(--accent-primary-bright);
}

.site-brand:hover .brand-name {
  color: var(--accent-primary-bright);
}

.nav-list a:hover,
.nav-list a:focus-visible,
.lang-button:not(:disabled):hover,
.lang-button:not(:disabled):focus-visible {
  color: var(--text-primary);
  border-color: var(--accent-primary);
  background-color: var(--bg-subtle);
}

.lang-button[aria-pressed="true"]:not(:disabled):hover,
.lang-button[aria-pressed="true"]:not(:disabled):focus-visible {
  color: var(--accent-primary-bright);
  background-color: var(--accent-primary-subtle);
  border-color: var(--accent-primary-bright);
}

.action-primary:hover,
.action-primary:focus-visible {
  background-color: var(--accent-primary-bright);
  border-color: var(--accent-primary-bright);
  color: var(--bg-base);
}

.action-secondary:hover,
.action-secondary:focus-visible {
  background-color: var(--bg-subtle);
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.project-links a:hover,
.project-links a:focus-visible,
.contact-list a:hover,
.contact-list a:focus-visible {
  border-color: var(--accent-primary);
  background-color: var(--bg-elevated);
  color: var(--accent-primary-bright);
}

/* --------------------------------------------------------------------------
   8. Media Queries & User Preferences
   -------------------------------------------------------------------------- */

/* Tablet (768px and up) */
@media (min-width: 48rem) {
  .header-inner,
  .site-main,
  .footer-inner {
    padding-inline: var(--space-6);
  }

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

  .about-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .about-grid .about-block:first-child {
    grid-column: 1 / -1;
  }

  .project-details {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .stack-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .contact-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-inner {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
  }
}

/* Desktop (1024px and up) */
@media (min-width: 64rem) {
  .header-inner {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
  }

  .site-nav {
    width: auto;
  }

  .lang-switcher {
    width: auto;
  }

  .hero-section {
    padding: var(--space-10);
  }

  .about-grid {
    grid-template-columns: minmax(0, 1.25fr) repeat(2, minmax(0, 1fr));
  }

  .about-grid .about-block:first-child {
    grid-column: auto;
  }

  .homelab-blocks {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Reduced Motion Preference */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0ms;
  }

  html {
    scroll-behavior: auto;
  }
}