/* === Design tokens === */
:root {
  --color-white: #ffffff;
  --color-ice: #f5f9fc;
  --color-mist: #e8eef2;
  --color-sky: #d6e4ec;
  --color-steel: #9aaab4;
  --color-charcoal: #1c2126;
  --color-charcoal-soft: #2a3138;
  --color-earth: #c9b9a9;
  --color-earth-muted: #e8e0d8;
  --color-accent: #5b8a9a;
  --color-glow: rgba(91, 138, 154, 0.35);
  --color-success: #2d7a5a;
  --color-error: #b14b4b;

  --bg-body: linear-gradient(180deg, var(--color-ice) 0%, var(--color-mist) 100%);
  --bg-glass: rgba(255, 255, 255, 0.55);
  --bg-glass-strong: rgba(255, 255, 255, 0.82);
  --border-glass: rgba(255, 255, 255, 0.65);
  --shadow-float: 0 24px 60px rgba(28, 33, 38, 0.08), 0 8px 20px rgba(28, 33, 38, 0.04);
  --shadow-soft: 0 12px 32px rgba(28, 33, 38, 0.06);
  --shadow-glow: 0 0 40px rgba(91, 138, 154, 0.18);

  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 32px;
  --radius-full: 999px;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration: 0.6s;
}

/* === Reset & base === */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  margin: 0;
  font-family: var(--font-family);
  font-weight: 400;
  color: var(--color-charcoal);
  background: var(--bg-body);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

button {
  font: inherit;
  cursor: pointer;
}

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
}

/* === Scanlines overlay === */
.scanlines {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1000;
  opacity: 0.04;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(28, 33, 38, 0.08) 2px,
    rgba(28, 33, 38, 0.08) 4px
  );
}

/* === Particle canvas === */
.particle-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

/* === Scroll progress === */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 200;
  background: rgba(154, 170, 180, 0.15);
}

.scroll-progress__bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-steel), var(--color-accent), var(--color-earth));
  box-shadow: 0 0 10px var(--color-glow);
  transition: width 0.1s linear;
}

/* === Atmosphere === */
.atmosphere {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.horizon-line {
  position: absolute;
  left: -10%;
  right: -10%;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(154, 170, 180, 0.25) 20%,
    rgba(154, 170, 180, 0.55) 50%,
    rgba(154, 170, 180, 0.25) 80%,
    transparent 100%
  );
  top: 38%;
  animation: horizonPulse 8s ease-in-out infinite;
}

.horizon-line--lower {
  top: 72%;
  opacity: 0.4;
  animation-delay: -4s;
}

.horizon-line--data {
  top: 55%;
  opacity: 0.25;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(91, 138, 154, 0.15) 30%,
    rgba(91, 138, 154, 0.35) 50%,
    rgba(91, 138, 154, 0.15) 70%,
    transparent 100%
  );
  animation: horizonPulse 6s ease-in-out infinite, dataFlow 12s linear infinite;
  background-size: 200% 100%;
  animation-delay: -2s;
}

@keyframes horizonPulse {
  0%, 100% { opacity: 0.35; }
  50% { opacity: 0.7; }
}

@keyframes dataFlow {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* === Header === */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.25rem 0;
  transition: background var(--duration) var(--ease-out), box-shadow var(--duration) var(--ease-out);
}

.header--scrolled {
  background: rgba(245, 249, 252, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 rgba(154, 170, 180, 0.15);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-charcoal);
}

.logo__mark {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-steel);
  position: relative;
  background: radial-gradient(circle at 30% 30%, var(--color-white), var(--color-sky));
  box-shadow: inset 0 0 0 4px var(--color-ice), 0 4px 12px rgba(28, 33, 38, 0.08);
  animation: logoPulse 3s ease-in-out infinite;
}

.logo__mark::after {
  content: '';
  position: absolute;
  inset: 7px;
  border-radius: var(--radius-full);
  background: var(--color-charcoal);
}

.logo__mark::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(91, 138, 154, 0.3);
  animation: logoRing 3s ease-in-out infinite;
}

@keyframes logoPulse {
  0%, 100% { box-shadow: inset 0 0 0 4px var(--color-ice), 0 4px 12px rgba(28, 33, 38, 0.08); }
  50% { box-shadow: inset 0 0 0 4px var(--color-ice), 0 4px 20px rgba(91, 138, 154, 0.25); }
}

@keyframes logoRing {
  0%, 100% { transform: scale(1); opacity: 0.6; }
  50% { transform: scale(1.15); opacity: 0; }
}

.logo__mark--img {
  background: none;
  border: none;
  box-shadow: none;
  animation: none;
  object-fit: cover;
}

.logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo__text-main {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.1em;
}

.logo__text-sub {
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  color: var(--color-steel);
  font-family: var(--font-mono);
}

.logo--small .logo__mark {
  width: 24px;
  height: 24px;
}

.logo--small .logo__mark::after {
  inset: 5px;
}

.logo--small .logo__text-main {
  font-size: 0.75rem;
}

.logo--small .logo__text-sub {
  font-size: 0.55rem;
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav__link {
  position: relative;
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  color: var(--color-steel);
  transition: color var(--duration) var(--ease-out);
}

.nav__link::after {
  content: '';
  position: absolute;
  left: 1rem;
  right: 1rem;
  bottom: 0;
  height: 1px;
  background: var(--color-charcoal);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration) var(--ease-out);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-charcoal);
}

.nav__link:hover::after,
.nav__link--active::after {
  transform: scaleX(1);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  padding: 0;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--color-charcoal);
  border-radius: 2px;
  transition: transform var(--duration) var(--ease-out), opacity var(--duration) var(--ease-out);
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* === Hero === */
.hero {
  position: relative;
  z-index: 2;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 10rem 0 6rem;
  overflow: hidden;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 4rem;
  align-items: center;
}

.hero__content {
  opacity: 0;
  transform: translateY(24px);
  animation: fadeUp 1s var(--ease-out) 0.2s forwards;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-steel);
  margin-bottom: 1.5rem;
  font-family: var(--font-mono);
}

.hero__eyebrow-dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-accent);
  animation: dotBlink 1.5s ease-in-out infinite;
}

@keyframes dotBlink {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; box-shadow: 0 0 8px var(--color-glow); }
}

.typewriter {
  min-width: 1ch;
}

.cursor {
  display: inline-block;
  color: var(--color-accent);
  animation: cursorBlink 1s step-end infinite;
}

@keyframes cursorBlink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.hero__title {
  font-size: clamp(2.75rem, 7vw, 5.5rem);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin: 0 0 1.5rem;
}

.reveal-line {
  display: block;
  opacity: 0;
  transform: translateY(24px);
  animation: fadeUp 1s var(--ease-out) forwards;
}

.reveal-line:nth-child(1) { animation-delay: 0.35s; }
.reveal-line:nth-child(2) { animation-delay: 0.5s; }
.reveal-line:nth-child(3) { animation-delay: 0.65s; }

.reveal-line--muted {
  color: var(--color-steel);
}

.hero__subtitle {
  max-width: 520px;
  font-size: 1.15rem;
  color: var(--color-steel);
  margin-bottom: 2.5rem;
  line-height: 1.7;
  opacity: 0;
  animation: fadeUp 1s var(--ease-out) 0.85s forwards;
}

.hero__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 1s var(--ease-out) 1s forwards;
}

/* === Buttons === */
.button {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.95rem 1.75rem;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: transform var(--duration) var(--ease-out), box-shadow var(--duration) var(--ease-out), background var(--duration) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.button:hover {
  transform: translateY(-2px);
}

.button--primary {
  background: var(--color-charcoal);
  color: var(--color-white);
  box-shadow: 0 8px 24px rgba(28, 33, 38, 0.18);
}

.button--primary:hover {
  background: var(--color-charcoal-soft);
  box-shadow: 0 12px 32px rgba(28, 33, 38, 0.24), 0 0 20px rgba(91, 138, 154, 0.15);
}

.button--primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
  transition: left 0.6s var(--ease-out);
}

.button--primary:hover::before {
  left: 100%;
}

.button__dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-earth);
  animation: dotPulse 2.5s ease-in-out infinite;
}

@keyframes dotPulse {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.3); }
}

.button--ghost {
  background: transparent;
  color: var(--color-charcoal);
  border: 1px solid rgba(154, 170, 180, 0.45);
  backdrop-filter: blur(4px);
}

.button--ghost:hover {
  background: rgba(255, 255, 255, 0.5);
  border-color: rgba(154, 170, 180, 0.7);
}

/* === Hero visual === */
.hero__visual {
  position: relative;
  height: 460px;
  opacity: 0;
  animation: fadeIn 1.4s var(--ease-out) 0.7s forwards;
  transform-style: preserve-3d;
  perspective: 1000px;
}

.orb {
  position: absolute;
  border-radius: var(--radius-full);
  background: radial-gradient(circle at 30% 30%, var(--color-white), var(--color-sky));
  box-shadow: inset -20px -20px 60px rgba(154, 170, 180, 0.25), 0 20px 50px rgba(28, 33, 38, 0.08);
  animation: float 7s ease-in-out infinite;
  transform-style: preserve-3d;
}

.orb--large {
  width: 300px;
  height: 300px;
  top: 5%;
  right: 0%;
  animation-delay: 0s;
}

.orb__ring {
  position: absolute;
  border-radius: var(--radius-full);
  border: 1px solid rgba(91, 138, 154, 0.25);
  inset: -20px;
  animation: ringExpand 4s ease-out infinite;
}

.orb__ring--2 {
  inset: -40px;
  animation-delay: -2s;
}

@keyframes ringExpand {
  0% { transform: scale(1); opacity: 0.6; }
  100% { transform: scale(1.15); opacity: 0; }
}

.orb--medium {
  width: 120px;
  height: 120px;
  top: 45%;
  left: 5%;
  background: radial-gradient(circle at 30% 30%, var(--color-earth-muted), var(--color-earth));
  opacity: 0.6;
  animation-delay: -2s;
}

.orb--small {
  width: 48px;
  height: 48px;
  top: 18%;
  left: 32%;
  background: var(--color-charcoal);
  box-shadow: 0 8px 24px rgba(28, 33, 38, 0.2);
  animation-delay: -4s;
}

.console {
  position: absolute;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-float);
}

.console--vertical {
  width: 14px;
  height: 200px;
  top: 5%;
  left: 0;
}

.console--horizontal {
  width: 260px;
  height: 14px;
  bottom: 12%;
  right: 0;
}

.data-ring {
  position: absolute;
  border-radius: var(--radius-full);
  border: 1px dashed rgba(91, 138, 154, 0.25);
  animation: rotate 20s linear infinite;
}

.data-ring--1 {
  width: 360px;
  height: 360px;
  top: 0;
  right: -30px;
}

.data-ring--2 {
  width: 420px;
  height: 420px;
  top: -30px;
  right: -60px;
  animation-direction: reverse;
  animation-duration: 30s;
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}

@keyframes fadeIn {
  to { opacity: 1; }
}

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* === Hero metrics === */
.hero__metrics {
  display: flex;
  gap: 3rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(154, 170, 180, 0.2);
  opacity: 0;
  animation: fadeUp 1s var(--ease-out) 1.2s forwards;
}

.metric {
  display: flex;
  flex-direction: column;
}

.metric__value {
  font-size: 2rem;
  font-weight: 300;
  letter-spacing: -0.03em;
  color: var(--color-charcoal);
  font-family: var(--font-mono);
}

.metric__label {
  font-size: 0.8rem;
  color: var(--color-steel);
  letter-spacing: 0.05em;
}

/* === Section header === */
.section-header {
  margin-bottom: 4rem;
}

.section-header--centered {
  text-align: center;
}

.section-header--centered .section-header__description {
  margin-left: auto;
  margin-right: auto;
}

.section-header--compact {
  margin-bottom: 2rem;
}

.section-header__index {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--color-steel);
  margin-bottom: 0.75rem;
  font-family: var(--font-mono);
}

.section-header__title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 300;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
}

.section-header__description {
  max-width: 520px;
  color: var(--color-steel);
  font-size: 1.05rem;
  line-height: 1.7;
  margin: 0;
}

/* === Articles === */
.articles {
  position: relative;
  z-index: 2;
  padding: 7rem 0;
}

.articles__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.article-card {
  position: relative;
  padding: 2.25rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-soft);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
  opacity: 0;
  transform: translateY(30px);
  overflow: hidden;
  transform-style: preserve-3d;
}

.article-card--visible {
  opacity: 1;
  transform: translateY(0);
}

.article-card:hover {
  box-shadow: var(--shadow-float), var(--shadow-glow);
}

.article-card__glow {
  position: absolute;
  inset: 0;
  opacity: 0;
  background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(91, 138, 154, 0.12), transparent 50%);
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.article-card:hover .article-card__glow {
  opacity: 1;
}

.article-card__meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
  font-size: 0.8rem;
  color: var(--color-steel);
  font-family: var(--font-mono);
}

.article-card__tag {
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  background: rgba(91, 138, 154, 0.12);
  color: var(--color-charcoal);
}

.article-card__title {
  font-size: 1.35rem;
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 0.75rem;
}

.article-card__description {
  color: var(--color-steel);
  line-height: 1.65;
  margin: 0 0 1.5rem;
}

.article-card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-charcoal);
  transition: gap var(--duration) var(--ease-out);
}

.article-card__link::after {
  content: '→';
  transition: transform var(--duration) var(--ease-out);
}

.article-card__link:hover::after {
  transform: translateX(4px);
}

/* === About === */
.about {
  position: relative;
  z-index: 2;
  padding: 5rem 0 8rem;
}

.about__panel {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding: 3.5rem clamp(2rem, 5vw, 5rem);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.7) 0%, rgba(232, 238, 242, 0.6) 100%);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-float);
  overflow: hidden;
  transform-style: preserve-3d;
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.about__panel:hover {
  box-shadow: var(--shadow-float), var(--shadow-glow);
}

.about__glow {
  position: absolute;
  inset: 0;
  opacity: 0;
  background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(91, 138, 154, 0.1), transparent 50%);
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.about__panel:hover .about__glow {
  opacity: 1;
}

.about__content {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.about__content p {
  margin: 0;
  color: var(--color-charcoal-soft);
  line-height: 1.75;
}

.about__signature {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(154, 170, 180, 0.25);
}

.about__avatar {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  object-fit: cover;
  background: var(--color-ice);
  box-shadow: inset 0 0 0 3px var(--color-white), 0 4px 12px rgba(28, 33, 38, 0.08);
}

.about__signature strong {
  display: block;
  font-weight: 500;
  margin-bottom: 0.15rem;
}

.about__signature span {
  font-size: 0.85rem;
  color: var(--color-steel);
}

/* === Contact === */
.contact {
  position: relative;
  z-index: 2;
  padding: 7rem 0;
}

.contact__form {
  max-width: 720px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.field--wide {
  grid-column: 1 / -1;
}

.field__label {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-steel);
  font-family: var(--font-mono);
}

.field__input {
  padding: 1rem 1.25rem;
  font-size: 1rem;
  color: var(--color-charcoal);
  background: var(--bg-glass-strong);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--duration) var(--ease-out), box-shadow var(--duration) var(--ease-out), transform var(--duration) var(--ease-out);
}

.field__input::placeholder {
  color: var(--color-steel);
}

.field__input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(91, 138, 154, 0.15);
  transform: translateY(-2px);
}

.field__input--textarea {
  resize: vertical;
  min-height: 140px;
}

.contact__actions {
  display: flex;
  justify-content: center;
  padding-top: 0.5rem;
}

.contact__status {
  text-align: center;
  min-height: 1.5rem;
  font-size: 0.95rem;
  opacity: 0;
  transition: opacity var(--duration) var(--ease-out);
}

.contact__status:not(:empty) {
  opacity: 1;
}

.contact__status--success {
  color: var(--color-success);
}

.contact__status--error {
  color: var(--color-error);
}

/* === Footer === */
.footer {
  position: relative;
  z-index: 2;
  padding: 3rem 0;
  border-top: 1px solid rgba(154, 170, 180, 0.2);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.footer__col {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.footer__copy {
  font-size: 0.8rem;
  color: var(--color-steel);
  margin: 0;
}

.footer__social {
  gap: 0.75rem;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  color: var(--color-charcoal);
  transition: transform var(--duration) var(--ease-out), background var(--duration) var(--ease-out), box-shadow var(--duration) var(--ease-out);
}

.social-link:hover {
  transform: translateY(-3px);
  background: var(--color-white);
  box-shadow: 0 8px 20px rgba(91, 138, 154, 0.15);
}

.social-link svg {
  width: 18px;
  height: 18px;
}

/* === Articles footer === */
.articles__footer {
  display: flex;
  justify-content: center;
  margin-top: 3rem;
}

/* === Tag filters === */
.articles__filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(154, 170, 180, 0.2);
}

.tag-filter {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--color-steel);
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--duration) var(--ease-out);
}

.tag-filter:hover {
  color: var(--color-charcoal);
  background: var(--color-white);
}

.tag-filter--active {
  color: var(--color-white);
  background: var(--color-charcoal);
  border-color: var(--color-charcoal);
}

.articles__error {
  color: var(--color-steel);
  text-align: center;
  padding: 2rem;
}

/* === Page hero === */
.page-hero {
  position: relative;
  z-index: 2;
  padding: 12rem 0 4rem;
  min-height: 50vh;
  display: flex;
  align-items: center;
}

.page-hero__content {
  max-width: 680px;
}

.page-hero__title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin: 0 0 1rem;
}

.page-hero__description {
  font-size: 1.15rem;
  color: var(--color-steel);
  line-height: 1.7;
  margin: 0;
}

/* === Article page === */
.article-page {
  position: relative;
  z-index: 2;
  padding: 10rem 0 6rem;
}

.article-page__header {
  max-width: 760px;
  margin-bottom: 3rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid rgba(154, 170, 180, 0.25);
}

.article-page__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 1rem 0 1.25rem;
}

.article-page__lead {
  font-size: 1.2rem;
  color: var(--color-steel);
  line-height: 1.7;
  margin: 0;
}

.article-page__content {
  max-width: 720px;
  font-size: 1.05rem;
  line-height: 1.8;
}

.article-page__content h2 {
  font-size: 1.5rem;
  font-weight: 500;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.article-page__content h3 {
  font-size: 1.25rem;
  font-weight: 500;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.article-page__content p {
  margin-bottom: 1.25rem;
}

.article-page__content ul,
.article-page__content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-page__content li {
  margin-bottom: 0.6rem;
}

.article-page__content strong {
  font-weight: 500;
  color: var(--color-charcoal);
}

.article-page__content code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 0.15em 0.4em;
  background: rgba(91, 138, 154, 0.1);
  border-radius: 4px;
}

.article-page__content pre {
  padding: 1.25rem;
  background: var(--color-charcoal);
  color: var(--color-ice);
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

.article-page__content pre code {
  background: transparent;
  padding: 0;
}

.article-page__content blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.5rem;
  border-left: 3px solid var(--color-accent);
  background: rgba(91, 138, 154, 0.06);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.article-page__footer {
  max-width: 720px;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(154, 170, 180, 0.25);
  flex-wrap: wrap;
}

/* === Glitch effect utility === */
.glitch {
  position: relative;
}

.glitch::before,
.glitch::after {
  content: attr(data-text);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
}

/* === Responsive === */
@media (max-width: 992px) {
  .hero__inner {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .hero__visual {
    height: 360px;
    order: -1;
  }

  .orb--large {
    width: 240px;
    height: 240px;
  }

  .data-ring--1 {
    width: 300px;
    height: 300px;
  }

  .data-ring--2 {
    width: 340px;
    height: 340px;
  }

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

  .hero__metrics {
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .nav {
    position: fixed;
    inset: 0;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    background: rgba(245, 249, 252, 0.96);
    backdrop-filter: blur(20px);
    transform: translateY(-100%);
    opacity: 0;
    transition: transform var(--duration) var(--ease-out), opacity var(--duration) var(--ease-out);
  }

  .nav--open {
    transform: translateY(0);
    opacity: 1;
  }

  .nav__link {
    font-size: 1.5rem;
    font-weight: 300;
  }

  .menu-toggle {
    display: flex;
    position: relative;
    z-index: 110;
  }

  .hero {
    padding-top: 8rem;
  }

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

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

  .footer__inner {
    flex-direction: column;
    text-align: center;
  }

  .hero__metrics {
    flex-wrap: wrap;
    justify-content: center;
  }

  .metric {
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}