/* ==========================================================================
   EffNine — design system
   Monochrome. Minimal. Technical.
   ========================================================================== */

:root {
  /* palette — monochrome dark */
  --bg: #0b0b0b;
  --bg-deep: #080808;
  --surface: #141414;
  --wash: #101010;
  --ink: #d6d6d6;
  --ink-strong: #e8e8e8;
  --ink-soft: #b0b0b0;
  --gray: #888888;
  --gray-light: #555555;
  --line: #202020;
  --line-strong: #2e2e2e;

  /* type */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono",
    Menlo, Consolas, "Liberation Mono", monospace;

  /* layout */
  --container: 1040px;
  --gutter: clamp(20px, 4vw, 32px);
  --section-pad: clamp(72px, 12vw, 128px);
}

/* ---------- reset ---------- */

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

html {
  color-scheme: dark;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

h1,
h2,
h3,
p {
  margin: 0;
}

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

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

.mono {
  font-family: var(--font-mono);
}

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- skip link ---------- */

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--ink);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 10px 16px;
}

.skip-link:focus {
  left: 0;
}

/* ---------- header / nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 11, 11, 0.9);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  width: 28px;
  height: auto;
}

.brand-name {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.18em;
}

.nav-links {
  display: flex;
  gap: 8px;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray);
  padding: 8px 12px;
  border-radius: 4px;
  transition: background-color 120ms ease, color 120ms ease;
}

.nav-links a:hover {
  color: var(--ink);
  background: var(--wash);
}

/* ---------- hero ---------- */

.hero {
  border-bottom: 1px solid var(--line);
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(to bottom, black 60%, transparent 100%);
  mask-image: linear-gradient(to bottom, black 60%, transparent 100%);
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding-block: clamp(112px, 17vw, 200px);
}

.hero-mark {
  width: 96px;
  height: auto;
  margin-bottom: 28px;
}

.hero-title {
  font-size: clamp(3rem, 9vw, 6.75rem);
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1;
  color: var(--ink-strong);
}

.hero-descriptor {
  margin-top: 20px;
  font-size: clamp(13px, 1.6vw, 16px);
  letter-spacing: 0.32em;
  color: var(--gray);
}

.hero-statement {
  margin-top: 36px;
  max-width: 560px;
  font-size: clamp(17px, 2vw, 19px);
  line-height: 1.7;
  color: var(--ink-soft);
}

.hero-actions {
  margin-top: 44px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

/* ---------- buttons ---------- */

.btn {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 13px 24px;
  border-radius: 4px;
  transition: background-color 120ms ease, color 120ms ease, border-color 120ms ease;
}

.btn-primary {
  background: var(--ink);
  color: var(--bg);
  border: 1px solid var(--ink);
}

.btn-primary:hover {
  background: var(--ink-strong);
  border-color: var(--ink-strong);
}

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

.btn-secondary:hover {
  background: var(--wash);
  border-color: var(--gray);
}

/* ---------- sections ---------- */

.section {
  padding-block: var(--section-pad);
  scroll-margin-top: 88px;
}

.section-alt {
  background: var(--wash);
  border-block: 1px solid var(--line);
}

.eyebrow {
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray);
}

.section-title {
  margin-top: 16px;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.15;
}

/* ---------- card grid (what we build) ---------- */

.card-grid {
  margin-top: 56px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.card {
  background: var(--surface);
  padding: clamp(24px, 3.5vw, 36px);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.card-index {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gray-light);
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.card-body {
  font-size: 15px;
  line-height: 1.65;
  color: var(--gray);
}

/* ---------- project list (selected work) ---------- */

.project-list {
  margin-top: 56px;
  border-top: 1px solid var(--line);
}

.project {
  border-bottom: 1px solid var(--line);
  padding-block: clamp(28px, 4vw, 40px);
  transition: background-color 120ms ease;
}

.project:hover {
  background: rgba(255, 255, 255, 0.02);
}

.project-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.project-name {
  font-size: clamp(1.25rem, 2.6vw, 1.6rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.project-status {
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gray);
  border: 1px solid var(--line);
  padding: 4px 10px;
  border-radius: 999px;
}

.project-desc {
  margin-top: 12px;
  max-width: 640px;
  font-size: 15.5px;
  line-height: 1.65;
  color: var(--gray);
}

/* ---------- about ---------- */

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: clamp(32px, 6vw, 80px);
  align-items: start;
}

.about-body {
  display: flex;
  flex-direction: column;
  gap: 20px;
  font-size: clamp(17px, 2vw, 19px);
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- footer ---------- */

.site-footer {
  background: var(--bg-deep);
  color: var(--ink);
  border-top: 1px solid var(--line);
  padding-block: clamp(56px, 8vw, 88px);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-mark {
  width: 28px;
  height: auto;
}

.footer-name {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.18em;
}

.footer-descriptor {
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--gray-light);
}

.footer-nav,
.footer-meta {
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gray);
}

.footer-nav a:hover {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.footer-meta p {
  margin: 0;
}

/* ---------- responsive ---------- */

@media (max-width: 720px) {
  .card-grid {
    grid-template-columns: 1fr;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-actions .btn {
    width: 100%;
  }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}