/* Third Division Labs — Desert Tech + Clean Precision + Accent Bar */
/* Fonts: F4 (Rubik / Fira Code) | Palette: P4 (Desert Tech) | Layout: B + C accent bars */

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

:root {
  /* Backgrounds */
  --color-bg: #FDF8F4;
  --color-surface: #FFFFFF;
  --color-surface-alt: #F5F0EB;
  --color-muted: #F0EAE3;

  /* Text */
  --color-text: #1C1917;
  --color-text-secondary: #78716C;
  --color-text-inverse: #FFFFFF;

  /* Accents — Desert Tech */
  --color-accent: #7C2D12;
  --color-accent-hover: #9A3412;
  --color-accent-secondary: #0F766E;
  --color-accent-secondary-hover: #0D9488;

  /* Borders */
  --color-border: #E7E0D9;
  --color-border-hover: #7C2D12;
  --color-divider: #E7E0D9;

  /* Typography */
  --font-heading: 'Rubik', system-ui, sans-serif;
  --font-body: 'Rubik', system-ui, sans-serif;
  --font-mono: 'Fira Code', 'Courier New', monospace;

  --text-base: 19px;
  --text-sm: 16px;
  --text-lg: 22px;
  --text-xl: 32px;
  --text-2xl: 44px;
  --text-hero: 52px;
  --text-stat: 64px;

  --leading-tight: 1.15;
  --leading-normal: 1.7;

  /* Spacing */
  --space-section: 140px;
  --space-subsection: 56px;
  --space-element: 32px;
  --space-tight: 16px;

  /* Layout */
  --max-width: 1120px;
  --gutter: 32px;
  --radius: 8px;
  --radius-lg: 12px;
  --accent-bar-width: 4px;

  /* Effects */
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.07);
}

html {
  font-size: var(--text-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: var(--leading-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent-secondary); text-decoration: none; }
a:hover { color: var(--color-accent-secondary-hover); }

/* ── Container ── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ── Nav ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(253, 248, 244, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--color-text); }

.nav-cta {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-inverse) !important;
  background: var(--color-accent);
  padding: 8px 20px;
  border-radius: var(--radius);
  transition: background 0.2s;
}
.nav-cta:hover {
  background: var(--color-accent-hover);
  color: var(--color-text-inverse) !important;
}

/* ── Hero ── */
.hero {
  padding: 120px 0 var(--space-section);
  text-align: center;
}

.hero-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-secondary);
  margin-bottom: 20px;
}

.hero h1 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-hero);
  line-height: var(--leading-tight);
  color: var(--color-text);
  margin-bottom: 20px;
}

.hero h1 span {
  color: var(--color-accent);
}

.hero-sub {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 720px;
  margin: 0 auto 40px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text-inverse);
  background: var(--color-accent);
  padding: 14px 32px;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  color: var(--color-text-inverse);
  box-shadow: 0 4px 16px rgba(124, 45, 18, 0.2);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: transparent;
  padding: 14px 32px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.btn-ghost:hover {
  border-color: var(--color-text-secondary);
  color: var(--color-text);
}

/* ── Thesis Bridge ── */
.thesis {
  padding: 80px 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.thesis-quote {
  max-width: 720px;
  margin: 0 auto;
  font-size: var(--text-xl);
  line-height: 1.5;
  color: var(--color-text-secondary);
  text-align: center;
  border: none;
  padding: 0;
  font-style: normal;
}

.thesis-quote strong {
  color: var(--color-text);
}

/* ── Work / Portfolio Cards ── */
.work-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-element);
  max-width: 860px;
  margin: 0 auto;
}

a.work-card {
  display: block;
  color: inherit;
  text-decoration: none;
}

.work-card {
  border-left: var(--accent-bar-width) solid var(--color-accent-secondary);
  padding: 32px 28px 28px 24px;
  background: var(--color-surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  border-top: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow 0.2s, border-left-color 0.2s;
}

.work-card:hover {
  box-shadow: var(--shadow-card-hover);
  border-left-color: var(--color-accent);
}

.work-domain {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.work-card h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 22px;
  margin-bottom: 12px;
  line-height: var(--leading-tight);
}

.work-card p {
  color: var(--color-text-secondary);
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 16px;
}

.work-specs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.work-specs span {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-accent-secondary);
  background: rgba(15, 118, 110, 0.08);
  padding: 4px 10px;
  border-radius: 4px;
}

.work-proof {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
  line-height: 1.5;
}

/* ── Section Shared ── */
.section {
  padding: var(--space-section) 0;
  background: var(--color-bg);
}

.section-alt {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-subsection);
}

.section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-2xl);
  line-height: var(--leading-tight);
  margin-bottom: 16px;
}

.section-desc {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 720px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ── Service Cards ── */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-element);
  margin-bottom: var(--space-subsection);
}

.service-card {
  border-left: var(--accent-bar-width) solid var(--color-accent);
  padding: 28px 24px 28px 20px;
  background: var(--color-surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  border-top: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow 0.2s, border-left-color 0.2s;
}

.service-card:hover {
  box-shadow: var(--shadow-card-hover);
  border-left-color: var(--color-accent-hover);
}

.service-price {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--color-accent-secondary);
  margin-bottom: 12px;
  text-transform: uppercase;
}

.service-card h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 20px;
  margin-bottom: 10px;
  line-height: var(--leading-tight);
}

.service-card p {
  color: var(--color-text-secondary);
  font-size: 16px;
  line-height: 1.6;
  margin-bottom: 16px;
}

.service-meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.service-meta span {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent-secondary);
  background: rgba(15, 118, 110, 0.08);
  padding: 4px 10px;
  border-radius: 4px;
}

/* ── Portfolio Cards ── */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-element);
}

.portfolio-card {
  border-left: var(--accent-bar-width) solid var(--color-accent-secondary);
  padding: 28px 24px 28px 20px;
  background: var(--color-surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  border-top: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow 0.2s, border-left-color 0.2s;
}

.portfolio-card:hover {
  box-shadow: var(--shadow-card-hover);
  border-left-color: var(--color-accent);
}

.portfolio-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.portfolio-card h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 20px;
  margin-bottom: 10px;
  line-height: var(--leading-tight);
}

.portfolio-card p {
  color: var(--color-text-secondary);
  font-size: 16px;
  line-height: 1.6;
}

/* ── About Section ── */
.about-content {
  max-width: 800px;
  margin: 0 auto;
}

.about-content p {
  font-size: 18px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.credentials {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 32px;
}

.credential-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
}

.credential-bullet {
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  margin-top: 10px;
  background: var(--color-accent-secondary);
  border-radius: 50%;
}

/* ── CTA Section ── */
.cta-section {
  padding: var(--space-section) 0;
  text-align: center;
}

.cta-section h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-2xl);
  margin-bottom: 16px;
}

.cta-section p {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 620px;
  margin: 0 auto 40px;
  line-height: 1.6;
}

/* ── Footer ── */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--color-border);
}

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

.footer-logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  text-transform: uppercase;
}

.footer-note {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* ── Arctic Night Dark Mode ── */
/* Cool blue-gray foundation with rust contrast — inverted desert temperature palette */

@media (prefers-color-scheme: dark) {
  :root {
    /* Backgrounds — Arctic Night */
    --color-bg: #0F1419;
    --color-surface: #1A2128;
    --color-surface-alt: #080B0E;
    --color-muted: #222A33;

    /* Text — Arctic Night */
    --color-text: #D4DCE3;
    --color-text-secondary: #8B99A8;
    --color-text-inverse: #080B0E;

    /* Accents — Arctic Night (swapped: teal primary, rust secondary) */
    --color-accent: #39ADB5;           /* Teal cool — buttons, accent bars */
    --color-accent-hover: #53C2C9;
    --color-accent-secondary: #E66533; /* Rust warm — tags, highlights */
    --color-accent-secondary-hover: #F07F4D;

    /* Borders — Arctic Night */
    --color-border: #1F2934;
    --color-border-hover: #39ADB5;
    --color-divider: #1F2934;

    /* Effects — Arctic Night */
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.5);
  }

  /* Nav backdrop — dark transparent */
  .nav {
    background: rgba(15, 20, 25, 0.92);
  }

  /* Button shadows — teal glow in dark mode */
  .btn-primary:hover {
    box-shadow: 0 4px 16px rgba(57, 173, 181, 0.3);
  }

  /* Work specs tags — rust accent bg in dark mode */
  .work-specs span {
    background: rgba(230, 101, 51, 0.12);
  }

  /* Service meta tags — rust accent bg in dark mode */
  .service-meta span {
    background: rgba(230, 101, 51, 0.12);
  }
}

/* Manual dark mode class (for toggle override) */
:root.dark {
  /* Backgrounds — Arctic Night */
  --color-bg: #0F1419;
  --color-surface: #1A2128;
  --color-surface-alt: #080B0E;
  --color-muted: #222A33;

  /* Text — Arctic Night */
  --color-text: #D4DCE3;
  --color-text-secondary: #8B99A8;
  --color-text-inverse: #080B0E;

  /* Accents — Arctic Night (swapped: teal primary, rust secondary) */
  --color-accent: #39ADB5;           /* Teal cool — buttons, accent bars */
  --color-accent-hover: #53C2C9;
  --color-accent-secondary: #E66533; /* Rust warm — tags, highlights */
  --color-accent-secondary-hover: #F07F4D;

  /* Borders — Arctic Night */
  --color-border: #1F2934;
  --color-border-hover: #39ADB5;
  --color-divider: #1F2934;

  /* Effects — Arctic Night */
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.5);
}

:root.dark .nav {
  background: rgba(15, 20, 25, 0.92);
}

:root.dark .btn-primary:hover {
  box-shadow: 0 4px 16px rgba(57, 173, 181, 0.3);
}

:root.dark .work-specs span {
  background: rgba(230, 101, 51, 0.12);
}

:root.dark .service-meta span {
  background: rgba(230, 101, 51, 0.12);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  :root {
    --text-hero: 36px;
    --text-2xl: 30px;
    --text-stat: 48px;
    --space-section: 80px;
    --space-subsection: 40px;
  }

  .nav-links { display: none; }

  .thesis-quote {
    font-size: var(--text-lg);
  }

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

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

  .footer-inner {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  :root {
    --text-hero: 28px;
    --text-stat: 40px;
    --gutter: 20px;
  }

  .hero { padding-top: 80px; }
}