/* ============================================================
   Ether Solutions · Compiled Stylesheet
   
   Design language: Pentagram Dark
   Inspired by styles 01 (Pentagram/Bierut) + 10 (Müller-Brockmann)
   Dark editorial authority. Black + vermillion. Zero radius. Zero gradients.
   
   Imports design language tokens + components.
   Google Fonts loaded here since this is a static GitHub Pages site
   with no build pipeline.
   ============================================================ */

/* --- Font Loading --- */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- Design Language: Tokens --- */

:root {
  /* Ink & Paper (dark mode) */
  --color-bg:          #050505;
  --color-bg-alt:      #0C0C0C;
  --color-ink:         #EDEDED;
  --color-ink-muted:   #8A8A8A;
  --color-ink-light:   #555555;
  
  /* Accent: vermillion red */
  --color-accent:       #D4380D;
  --color-accent-hover: #E84D23;
  --color-accent-light: #3A1A0E;
  
  /* Structural */
  --color-nav:          #000000;
  --color-nav-border:   #1A1A1A;
  --color-nav-text:     #666666;
  --color-nav-text-hover: #FFFFFF;
  --color-border:       #1A1A1A;
  --color-rule:         #2A2A2A;
  
  /* Semantic */
  --color-link:         #D4380D;
  --color-link-hover:   #E84D23;
  --color-selection:    #D4380D;
  --color-selection-bg: #3A1A0E;
  
  /* Dark section */
  --color-dark-bg:      #000000;
  --color-dark-text:    #EDEDED;
  --color-dark-muted:   #555555;
  --color-dark-border:  #141414;
  
  /* Typography */
  --font-display:  'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body:     'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:     'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
  
  /* Scale */
  --text-xs:     0.6875rem;
  --text-sm:     0.8125rem;
  --text-base:   1rem;
  --text-lg:     1.125rem;
  --text-xl:     1.25rem;
  --text-2xl:    1.5625rem;
  --text-3xl:    2rem;
  --text-4xl:    2.75rem;
  --text-5xl:    3.75rem;
  --text-hero:   5.5rem;
  
  /* Weights */
  --weight-light:    300;
  --weight-regular:  400;
  --weight-medium:   500;
  --weight-bold:     700;
  
  /* Leading */
  --leading-tight:   1.1;
  --leading-snug:    1.25;
  --leading-normal:  1.5;
  --leading-relaxed: 1.7;
  
  /* Tracking */
  --tracking-tight:  -0.03em;
  --tracking-normal:  0;
  --tracking-wide:    0.04em;
  --tracking-wider:   0.12em;
  --tracking-mono:    0.06em;
  
  /* Spacing */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  20px;
  --space-6:  24px;
  --space-8:  32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-24: 96px;
  --space-32: 128px;
  --space-48: 192px;
  
  --section-py:        var(--space-24);
  --section-py-mobile: var(--space-16);
  
  --content-max:    1040px;
  --content-narrow: 680px;
  --content-wide:   1400px;
  
  --radius-sm: 0px;
  --radius-md: 0px;
  --radius-lg: 0px;
  
  --shadow-subtle: none;
  --shadow-card:   0 2px 0 0 rgba(255,255,255,0.06);
  --shadow-hover:  0 4px 0 0 rgba(255,255,255,0.1);
  
  --transition-fast:  100ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
  
  --navbar-height: 64px;
}

/* --- Components --- */

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-ink);
  background-color: var(--color-bg);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

/* Navigation */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  background: var(--color-nav);
  border-bottom: 1px solid var(--color-nav-border);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.navbar__inner {
  max-width: var(--content-max);
  width: 100%;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar__brand img {
  height: 36px;
  width: auto;
  filter: brightness(0) invert(1);
}

.navbar__links {
  display: flex;
  gap: var(--space-6);
  list-style: none;
}

.navbar__links a {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-nav-text);
  padding: var(--space-1) 0;
}

.navbar__links a:hover,
.navbar__links a.active {
  color: var(--color-nav-text-hover);
}

.navbar__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.navbar__toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: #666;
  margin: 4px 0;
}

@media (max-width: 768px) {
  .navbar__toggle {
    display: block;
  }
  
  .navbar__links {
    display: none;
    position: absolute;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    background: var(--color-nav);
    border-bottom: 1px solid var(--color-nav-border);
    flex-direction: column;
    padding: var(--space-6);
    gap: var(--space-4);
  }
  
  .navbar__links.open {
    display: flex;
  }
}

/* Hero */

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-48) var(--space-6) var(--space-32);
  background: var(--color-bg);
  border-bottom: 2px solid var(--color-nav-border);
}

.hero__logo {
  max-width: 260px;
  margin-bottom: var(--space-12);
  filter: brightness(0) invert(1);
}

.hero__rule {
  width: 2px;
  height: 48px;
  background: var(--color-accent);
  margin: 0 auto var(--space-8);
}

.hero__tagline {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-16);
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: #FFF;
  background: var(--color-accent);
  padding: var(--space-3) var(--space-10);
  transition: background var(--transition-base);
}

.hero__cta:hover {
  background: var(--color-accent-hover);
  color: #FFF;
}

@media (min-width: 768px) {
  .hero__logo {
    max-width: 360px;
  }
}

/* Section */

.section {
  padding: var(--section-py) var(--space-6);
}

.section--alt {
  background: var(--color-bg-alt);
}

.section__inner {
  max-width: var(--content-max);
  margin: 0 auto;
}

.section__header {
  margin-bottom: var(--space-16);
}

.section__label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.section__heading {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: var(--weight-regular);
  line-height: var(--leading-tight);
  color: var(--color-ink);
}

@media (max-width: 768px) {
  .section {
    padding: var(--section-py-mobile) var(--space-4);
  }
  
  .section__heading {
    font-size: var(--text-3xl);
  }
}

/* Services */

.services-list {
  max-width: var(--content-max);
  margin: 0 auto;
  border-top: 2px solid var(--color-rule);
  padding-top: var(--space-8);
}

.service-item {
  padding: var(--space-8) 0;
  border-bottom: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-6);
  align-items: start;
  transition: border-color var(--transition-fast);
}

.service-item:hover {
  border-bottom-color: var(--color-accent);
}

.service-item__num {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wider);
  color: var(--color-accent);
  padding-top: 3px;
}

.service-item__name {
  font-family: var(--font-body);
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  line-height: var(--leading-snug);
  color: var(--color-ink);
  margin-bottom: var(--space-2);
  letter-spacing: var(--tracking-tight);
}

.service-item__desc {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-relaxed);
  color: var(--color-ink-muted);
}

/* Publications */

.publications-list {
  display: flex;
  flex-direction: column;
}

.publication-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-6);
  align-items: start;
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-rule);
  transition: border-color var(--transition-fast);
}

.publication-item:hover {
  border-bottom-color: var(--color-accent);
}

.publication-item__num {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wider);
  color: var(--color-accent);
  padding-top: 3px;
}

.publication-item__name {
  font-family: var(--font-body);
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  line-height: var(--leading-snug);
  color: var(--color-ink);
  margin-bottom: var(--space-2);
  letter-spacing: var(--tracking-tight);
}

.publication-item__desc {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-relaxed);
  color: var(--color-ink-muted);
  margin-bottom: var(--space-3);
}

.publication-item__link {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  color: var(--color-accent);
  text-decoration: none;
  letter-spacing: var(--tracking-wider);
  transition: color var(--transition-fast);
}

.publication-item__link:hover {
  color: var(--color-accent-hover);
}

/* Team */

.team-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  max-width: 720px;
  margin: 0 auto;
}

@media (max-width: 640px) {
  .team-grid {
    grid-template-columns: 1fr;
    max-width: 320px;
  }
}

.team-member {
  text-align: center;
}

.team-member__photo {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 15%;
  margin: 0 auto var(--space-6);
  filter: grayscale(100%) contrast(1.15) brightness(0.85);
  transition: filter var(--transition-base);
}

.team-member:hover .team-member__photo {
  filter: grayscale(0%) contrast(1) brightness(1);
}

.team-member__name {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--weight-regular);
  color: var(--color-ink);
  margin-bottom: var(--space-1);
}

.team-member__role {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-3);
}

.team-member__social a {
  color: var(--color-ink-light);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  transition: color var(--transition-fast);
}

.team-member__social a:hover {
  color: var(--color-accent);
}

/* Contact */

.section--dark {
  background: var(--color-dark-bg);
  color: var(--color-dark-text);
  border-top: 2px solid var(--color-dark-border);
}

.section--dark .section__label {
  color: var(--color-accent);
}

.section--dark .section__heading {
  color: var(--color-dark-text);
}

.contact-link {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-xl);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-tight);
  color: #FFF;
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
  transition: all var(--transition-base);
}

.contact-link:hover {
  color: var(--color-accent-hover);
  border-bottom-color: var(--color-accent-hover);
}

/* Footer */

.footer {
  background: var(--color-dark-bg);
  border-top: 1px solid var(--color-dark-border);
  padding: var(--space-8) var(--space-6);
}

.footer__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__copy {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-dark-muted);
}

.footer__social a {
  color: var(--color-dark-muted);
  font-weight: var(--weight-medium);
  transition: color var(--transition-fast);
  margin-left: var(--space-4);
}

.footer__social a:hover {
  color: #FFF;
}

/* Utility */

.text-center { text-align: center; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}