/* ============================================================
   nickgbuilds.com — Design System
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  -moz-tab-size: 4;
  tab-size: 4;
  scroll-behavior: smooth;
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

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

h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
  line-height: 1.2;
}

p {
  overflow-wrap: break-word;
}

a {
  color: inherit;
  text-decoration-skip-ink: auto;
}

ul, ol {
  list-style: none;
}

/* --- Color Tokens ------------------------------------------- */
:root {
  /* Dark mode (default) */
  --color-bg:         #0a0a0f;
  --color-bg-raised:  #12121a;
  --color-bg-surface: #1a1a24;
  --color-text:       #e8e4df;
  --color-text-muted: #9a958e;
  --color-text-faint: #5a564f;
  --color-accent:     #d4a04a;
  --color-accent-dim: #a67c32;
  --color-border:     #2a2a36;
  --color-border-strong: #3a3a48;
  --color-code-bg:    #16161e;
  --color-success:    #4a9e6e;
  --color-error:      #c45c5c;

  /* Spacing scale */
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Layout */
  --max-width: 1100px;
  --gutter: 1rem;

  /* Typography */
  --font-body: 'Outfit', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --text-xs:   clamp(0.75rem,  0.7rem  + 0.15vw, 0.8125rem);
  --text-sm:   clamp(0.8125rem, 0.78rem + 0.2vw, 0.875rem);
  --text-base: clamp(0.9375rem, 0.9rem  + 0.2vw, 1rem);
  --text-lg:   clamp(1.0625rem, 1rem    + 0.3vw, 1.125rem);
  --text-xl:   clamp(1.25rem,   1.1rem  + 0.5vw, 1.5rem);
  --text-2xl:  clamp(1.5rem,    1.3rem  + 0.7vw, 1.875rem);
  --text-3xl:  clamp(1.875rem,  1.5rem  + 1.2vw, 2.5rem);
  --text-4xl:  clamp(2.25rem,   1.8rem  + 1.5vw, 3.25rem);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
}

/* --- Light mode via prefers-color-scheme -------------------- */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --color-bg:         #f5f2ed;
    --color-bg-raised:  #faf8f5;
    --color-bg-surface: #ffffff;
    --color-text:       #1a1a1f;
    --color-text-muted: #5a564f;
    --color-text-faint: #9a958e;
    --color-accent:     #b8862e;
    --color-accent-dim: #d4a04a;
    --color-border:     #ddd8d0;
    --color-border-strong: #c5c0b8;
    --color-code-bg:    #edeae5;
    --color-success:    #3a7d58;
    --color-error:      #a84040;
  }
}

/* --- Light mode via manual toggle --------------------------- */
:root[data-theme="light"] {
  --color-bg:         #f5f2ed;
  --color-bg-raised:  #faf8f5;
  --color-bg-surface: #ffffff;
  --color-text:       #1a1a1f;
  --color-text-muted: #5a564f;
  --color-text-faint: #9a958e;
  --color-accent:     #b8862e;
  --color-accent-dim: #d4a04a;
  --color-border:     #ddd8d0;
  --color-border-strong: #c5c0b8;
  --color-code-bg:    #edeae5;
  --color-success:    #3a7d58;
  --color-error:      #a84040;
}

/* --- Dark mode via manual toggle ---------------------------- */
:root[data-theme="dark"] {
  --color-bg:         #0a0a0f;
  --color-bg-raised:  #12121a;
  --color-bg-surface: #1a1a24;
  --color-text:       #e8e4df;
  --color-text-muted: #9a958e;
  --color-text-faint: #5a564f;
  --color-accent:     #d4a04a;
  --color-accent-dim: #a67c32;
  --color-border:     #2a2a36;
  --color-border-strong: #3a3a48;
  --color-code-bg:    #16161e;
  --color-success:    #4a9e6e;
  --color-error:      #c45c5c;
}

/* --- Base --------------------------------------------------- */
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* --- Skip Link ---------------------------------------------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--gutter);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-accent);
  color: var(--color-bg);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-md);
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-md);
}

/* --- Typography --------------------------------------------- */
h1 { font-size: var(--text-4xl); font-weight: 700; letter-spacing: -0.02em; }
h2 { font-size: var(--text-3xl); font-weight: 700; letter-spacing: -0.01em; }
h3 { font-size: var(--text-2xl); font-weight: 600; }
h4 { font-size: var(--text-xl);  font-weight: 600; }

.mono {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

/* --- Prose (markdown content) ------------------------------- */
.prose {
  max-width: 72ch;
}

.prose > * + * {
  margin-top: var(--space-lg);
}

.prose h2 {
  margin-top: var(--space-3xl);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.prose h3 {
  margin-top: var(--space-2xl);
}

.prose h4 {
  margin-top: var(--space-xl);
}

.prose ul,
.prose ol {
  padding-left: var(--space-xl);
}

.prose ul {
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

.prose li + li {
  margin-top: var(--space-sm);
}

.prose a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

.prose a:hover {
  color: var(--color-text);
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  padding: 0.15em 0.4em;
  background: var(--color-code-bg);
  border-radius: var(--radius-sm);
}

.prose pre {
  padding: var(--space-lg);
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.prose pre code {
  padding: 0;
  background: none;
  border-radius: 0;
}

.prose blockquote {
  padding-left: var(--space-lg);
  border-left: 3px solid var(--color-accent);
  color: var(--color-text-muted);
  font-style: italic;
}

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

.prose img {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.prose hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-3xl) 0;
}

/* --- Layout ------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.page-content {
  padding: var(--space-3xl) 0;
}

/* --- Header ------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-base);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3.5rem;
}

.site-logo {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--color-text);
  transition: color var(--transition-fast);
}

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

.nav-desktop {
  display: none;
  align-items: center;
  gap: var(--space-xl);
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 1px;
  background: var(--color-accent);
  transition: width var(--transition-fast);
}

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

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Mobile nav toggle */
.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--color-text);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.nav-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.nav-toggle svg {
  width: 1.25rem;
  height: 1.25rem;
}

/* Mobile nav panel */
.nav-mobile {
  display: none;
  position: fixed;
  top: 3.5rem;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg);
  z-index: 99;
  padding: var(--space-xl) var(--gutter);
  flex-direction: column;
  gap: var(--space-md);
}

.nav-mobile.is-open {
  display: flex;
}

.nav-mobile .nav-link {
  font-size: var(--text-xl);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.nav-mobile .nav-link::after {
  display: none;
}

/* Theme toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--color-text-muted);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.theme-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.theme-toggle svg {
  width: 1.125rem;
  height: 1.125rem;
}

/* --- Footer ------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  text-align: center;
}

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

.footer-links {
  display: flex;
  gap: var(--space-lg);
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* --- Hero --------------------------------------------------- */
.hero {
  padding: var(--space-4xl) 0;
}

.hero-grid {
  display: grid;
  gap: var(--space-2xl);
  align-items: center;
}

.hero-headshot {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-border-strong);
}

.hero-name {
  font-size: var(--text-4xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.hero-tagline {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 48ch;
  margin-bottom: var(--space-lg);
}

.hero-links {
  display: flex;
  gap: var(--space-md);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
}

.btn-primary:hover {
  background: var(--color-accent-dim);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border-strong);
}

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

/* --- Section headings --------------------------------------- */
.section-heading {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.section-heading h2 {
  font-size: var(--text-xl);
  white-space: nowrap;
}

.section-heading::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.section-link {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.section-link:hover {
  color: var(--color-text);
}

/* --- Project card ------------------------------------------- */
.project-card {
  display: block;
  padding: var(--space-xl);
  background: var(--color-bg-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.project-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.project-card-status {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.project-card h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-sm);
}

.project-card p {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-lg);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  padding: 0.15em 0.5em;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
}

/* --- Build log entry card ----------------------------------- */
.log-card {
  display: block;
  padding: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
  transition: background-color var(--transition-fast);
}

.log-card:last-child {
  border-bottom: none;
}

.log-card:hover {
  background: var(--color-bg-raised);
}

.log-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xs);
}

.log-card-date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.log-card-status {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.log-card-status[data-status="complete"] { color: var(--color-success); }
.log-card-status[data-status="in-progress"] { color: var(--color-accent); }
.log-card-status[data-status="experimental"] { color: var(--color-text-muted); }

.log-card h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.log-card p {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-md);
}

/* --- Project detail header ---------------------------------- */
.project-header {
  margin-bottom: var(--space-3xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid var(--color-border);
}

.project-header h1 {
  margin-bottom: var(--space-md);
}

.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.project-meta-item {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.project-meta-item strong {
  color: var(--color-text);
  font-weight: 600;
}

/* --- Skill groups (About page) ------------------------------ */
.skill-grid {
  display: grid;
  gap: var(--space-xl);
}

.skill-group {
  padding: var(--space-xl);
  background: var(--color-bg-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.skill-group h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.skill-list .tag {
  font-size: var(--text-sm);
  padding: var(--space-xs) var(--space-md);
}

/* --- Contact form ------------------------------------------- */
.contact-form {
  max-width: 560px;
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: var(--text-base);
  transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--color-accent) 20%, transparent);
}

.form-textarea {
  min-height: 10rem;
  resize: vertical;
}

.form-note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-lg);
}

.form-status {
  margin-top: var(--space-md);
  font-size: var(--text-sm);
  font-family: var(--font-mono);
}

.form-status.success { color: var(--color-success); }
.form-status.error { color: var(--color-error); }

/* --- Page title (generic) ----------------------------------- */
.page-title {
  margin-bottom: var(--space-2xl);
}

.page-title h1 {
  margin-bottom: var(--space-sm);
}

.page-title p {
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  max-width: 54ch;
}

/* --- Focus styles ------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* --- Projects grid ------------------------------------------ */
.projects-grid {
  display: grid;
  gap: var(--space-xl);
}

/* --- Build log list ----------------------------------------- */
.log-list {
  border-top: 1px solid var(--color-border);
}

/* --- Responsive --------------------------------------------- */
@media (min-width: 768px) {
  :root {
    --gutter: 2rem;
  }

  .nav-desktop {
    display: flex;
  }

  .nav-toggle {
    display: none;
  }

  .hero-grid {
    grid-template-columns: auto 1fr;
  }

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

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

  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
  }
}

@media (min-width: 1024px) {
  :root {
    --gutter: 2.5rem;
  }

  .hero-grid {
    gap: var(--space-3xl);
  }

  .hero-headshot {
    width: 180px;
    height: 180px;
  }

  .skill-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}