:root {
  --bg: #0a0c0f;
  --bg-elevated: #11151a;
  --bg-panel: #0e1217;
  --border: #1e2630;
  --border-strong: #2a3544;
  --text: #e8edf2;
  --text-muted: #8b97a8;
  --accent: #5b8fb8;
  --accent-hover: #7aa8c9;
  --accent-dim: rgba(91, 143, 184, 0.14);
  --focus: #7aa8c9;
  --ok: #6a9e7a;
  --warn: #c4a35a;
  --neg: #b87a7a;
  --font: "IBM Plex Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --space: clamp(1rem, 3vw, 1.5rem);
  --wrap: min(1120px, calc(100% - 2 * var(--space)));
  --radius: 4px;
  --ease: 180ms ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.55;
  color: var(--text);
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(91, 143, 184, 0.09), transparent 55%),
    radial-gradient(ellipse 60% 40% at 100% 20%, rgba(30, 50, 70, 0.35), transparent 50%),
    linear-gradient(180deg, #080a0d 0%, var(--bg) 40%, #090b0e 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

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

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

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

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

.skip-link {
  position: absolute;
  left: var(--space);
  top: -100px;
  z-index: 100;
  padding: 0.5rem 0.85rem;
  background: var(--accent);
  color: #0a0c0f;
  text-decoration: none;
  font-weight: 600;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: 0.75rem;
}

.wrap {
  width: var(--wrap);
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 12, 15, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 3.75rem;
}

.wordmark {
  font-weight: 600;
  font-size: 1.125rem;
  letter-spacing: 0.02em;
  color: var(--text);
  text-decoration: none;
}

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

.nav {
  display: none;
  gap: 1.5rem;
}

.nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  overflow: hidden;
}

.lang-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.35rem 0.55rem;
  cursor: pointer;
}

.lang-btn.is-active {
  background: var(--accent-dim);
  color: var(--accent-hover);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: transparent;
  cursor: pointer;
  padding: 0;
}

.nav-toggle-bar,
.nav-toggle-bar::before,
.nav-toggle-bar::after {
  display: block;
  width: 1rem;
  height: 1.5px;
  background: var(--text);
  position: relative;
}

.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-bar::before {
  top: -5px;
}

.nav-toggle-bar::after {
  top: 5px;
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.5rem var(--space) 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.mobile-nav[hidden] {
  display: none;
}

.mobile-nav a {
  color: var(--text);
  text-decoration: none;
  padding: 0.65rem 0.25rem;
  font-weight: 500;
}

/* Hero */
.hero {
  position: relative;
  isolation: isolate;
  padding: clamp(2.5rem, 8vw, 5.5rem) 0 clamp(3rem, 8vw, 5rem);
  min-height: calc(100vh - 3.75rem);
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background: url("assets/bg-hero-v3.jpg") center top / cover no-repeat;
  filter: brightness(1.15) contrast(1.2) saturate(1.25);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(180deg, rgba(4, 10, 8, 0.25) 0%, rgba(8, 12, 12, 0.4) 45%, rgba(10, 12, 15, 0.82) 100%),
    linear-gradient(90deg, rgba(10, 12, 15, 0.35) 0%, transparent 50%, rgba(10, 12, 15, 0.25) 100%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 2.5rem;
  align-items: end;
}

.brand-line {
  margin: 0 0 0.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.75rem, 4.5vw, 2.75rem);
  font-weight: 600;
  line-height: 1.18;
  letter-spacing: -0.02em;
  max-width: 18ch;
}

.hero-lead {
  margin: 0 0 1.75rem;
  color: var(--text-muted);
  max-width: 42ch;
  font-size: 1.0625rem;
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.7rem 1.15rem;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--ease), border-color var(--ease), color var(--ease), transform var(--ease);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--accent);
  color: #0a0c0f;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #0a0c0f;
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}

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

.hero-panel {
  border: 1px solid var(--border);
  background:
    linear-gradient(145deg, rgba(91, 143, 184, 0.08), transparent 45%),
    rgba(14, 18, 23, 0.72);
  backdrop-filter: blur(6px);
  padding: 1.5rem 1.35rem;
}

.focus-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.focus-list li {
  font-family: var(--mono);
  font-size: 0.9375rem;
  color: var(--text);
  padding-left: 1rem;
  border-left: 2px solid var(--accent);
  line-height: 1.35;
}

/* Sections */
.section {
  position: relative;
  isolation: isolate;
  padding: clamp(3rem, 7vw, 5rem) 0;
  border-top: 1px solid var(--border);
}

.section.has-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background: url("assets/bg-section.jpg") center / cover no-repeat;
  filter: brightness(1.1) contrast(1.15) saturate(1.2);
  pointer-events: none;
}

.section.has-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, rgba(6, 12, 10, 0.4) 0%, rgba(8, 12, 12, 0.32) 50%, rgba(10, 12, 15, 0.6) 100%);
  pointer-events: none;
}

.section.has-bg > .wrap {
  position: relative;
  z-index: 2;
}

.section.has-bg-alt::before {
  background-position: 70% 40%;
  transform: scaleX(-1);
}

.section h2 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 3vw, 1.85rem);
  font-weight: 600;
  letter-spacing: -0.015em;
}

.section-lead {
  margin: 0 0 2rem;
  color: var(--text-muted);
  max-width: 48ch;
}

.service-grid,
.ref-grid {
  display: grid;
  gap: 1rem;
}

.service-card,
.ref-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 1.35rem 1.25rem;
}

.service-card h3,
.ref-card h3 {
  margin: 0 0 0.55rem;
  font-size: 1.0625rem;
  font-weight: 600;
}

.service-card p,
.ref-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.975rem;
}

.stack-line,
.refs-note,
.demo-note,
.form-hint {
  margin: 1.5rem 0 0;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.stack-line {
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.01em;
}

/* Demo */
.demo-panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 1.25rem;
}

.demo-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.demo-tab {
  appearance: none;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--ease), border-color var(--ease), color var(--ease);
}

.demo-tab:hover {
  color: var(--text);
  border-color: var(--accent);
}

.demo-tab.is-active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent-hover);
}

.flow-diagram {
  margin: 0 0 1rem;
  padding: 1rem;
  border: 1px solid var(--border);
  background: var(--bg);
  font-family: var(--mono);
  font-size: 0.8125rem;
}

.flow-diagram[hidden] {
  display: none;
}

.flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
}

.flow-node {
  display: inline-block;
  padding: 0.45rem 0.75rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: rgba(91, 143, 184, 0.08);
  color: var(--text);
  text-align: center;
  max-width: 100%;
}

.flow-decision {
  border-color: var(--accent);
  background: var(--accent-dim);
  transform: none;
  clip-path: none;
  font-weight: 600;
}

.flow-arrow {
  color: var(--text-muted);
  line-height: 1;
}

.flow-branch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-top: 0.65rem;
}

.flow-branch-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
}

.flow-branch-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.flow-branch-label.is-yes {
  color: var(--ok);
}

.flow-branch-label.is-no {
  color: var(--neg);
}

.field-label {
  display: block;
  margin-bottom: 0.45rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
}

#demo-input,
.contact-form textarea,
.contact-form input[type="text"] {
  width: 100%;
  font-family: var(--mono);
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 0.75rem 0.85rem;
  resize: vertical;
}

#demo-input:focus,
.contact-form textarea:focus,
.contact-form input[type="text"]:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.demo-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 0.85rem;
}

.demo-output {
  margin-top: 1.25rem;
  border-top: 1px solid var(--border);
  padding-top: 1.15rem;
  animation: reveal 280ms ease;
}

.demo-output[hidden] {
  display: none;
}

.demo-output h3 {
  margin: 0 0 0.85rem;
  font-size: 0.9375rem;
  font-weight: 600;
}

.case-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.case-item {
  display: grid;
  gap: 0.35rem;
  padding: 0.85rem 0.9rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
}

.case-item.is-happy {
  border-left-color: var(--ok);
}

.case-item.is-edge {
  border-left-color: var(--warn);
}

.case-item.is-negative {
  border-left-color: var(--neg);
}

.case-title {
  font-weight: 500;
  font-size: 0.9375rem;
}

.case-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.85rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* How */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.steps li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.step-num {
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--accent);
  padding-top: 0.2rem;
}

.steps h3 {
  margin: 0 0 0.35rem;
  font-size: 1.0625rem;
}

.steps p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.975rem;
}

/* Contact */
.contact-grid {
  display: grid;
  gap: 2rem;
}

.contact-meta {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.contact-meta li {
  display: grid;
  gap: 0.15rem;
}

.contact-meta span:first-child {
  font-size: 0.8125rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.contact-form {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 1.25rem;
  display: grid;
  gap: 1rem;
}

.field {
  display: grid;
  gap: 0.4rem;
}

.field label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
}

.field-row {
  display: grid;
  gap: 1rem;
}

.contact-form .btn {
  justify-self: start;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0 2rem;
}

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

.footer-inner p {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.footer-inner a {
  margin-left: 0.35rem;
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 420ms ease, transform 420ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@keyframes reveal {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (min-width: 720px) {
  .nav {
    display: flex;
  }

  .nav-toggle {
    display: none;
  }

  .mobile-nav {
    display: none !important;
  }

  .hero-grid {
    grid-template-columns: 1.35fr 0.85fr;
    gap: 3rem;
    align-items: center;
  }

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

  .field-row {
    grid-template-columns: 1fr 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr 1.1fr;
    align-items: start;
  }

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

  .steps {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem 2rem;
  }

  .steps li {
    border-bottom: 0;
    padding-bottom: 0;
  }
}

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

  .reveal,
  .demo-output,
  .btn {
    transition: none !important;
    animation: none !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}