/* ===== Fonts (self-hosted, latin + latin-ext) ===== */
@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/ibm-plex-sans-400-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+2000-206F, U+20AC, U+2122;
}
@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/ibm-plex-sans-400-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-024F, U+1E00-1EFF, U+2020, U+2113;
}
@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/ibm-plex-sans-600-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+2000-206F, U+20AC, U+2122;
}
@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/ibm-plex-sans-600-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-024F, U+1E00-1EFF, U+2020, U+2113;
}
@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../fonts/ibm-plex-sans-700-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+2000-206F, U+20AC, U+2122;
}
@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../fonts/ibm-plex-sans-700-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-024F, U+1E00-1EFF, U+2020, U+2113;
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/ibm-plex-mono-400-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+2000-206F, U+20AC, U+2122;
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/ibm-plex-mono-400-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-024F, U+1E00-1EFF, U+2020, U+2113;
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../fonts/ibm-plex-mono-500-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+2000-206F, U+20AC, U+2122;
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../fonts/ibm-plex-mono-500-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-024F, U+1E00-1EFF, U+2020, U+2113;
}

/* ===== Design tokens ===== */
:root {
  --bg: #FAFAF9;
  --surface: #FFFFFF;
  --text: #14171F;
  --text-secondary: #5B6270;
  --border: #E4E4E7;
  --accent: #4338CA;
  --accent-hover: #372FA0;
  --accent-soft: rgba(67, 56, 202, .06);
  --on-accent: #FFFFFF;
  --nav-bg: rgba(250, 250, 249, .88);
  --graph-opacity: .22;

  --font-sans: 'IBM Plex Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  --ease-out-quint: cubic-bezier(.23, 1, .32, 1);
  --ease-out-cubic: cubic-bezier(.33, 1, .68, 1);

  --radius: 3px;
  --section-pad: 72px;
  --max-width: 1080px;
}

:root[data-theme="dark"] {
  --bg: #0E1014;
  --surface: #161A21;
  --text: #EEF0F4;
  --text-secondary: #9AA2B2;
  --border: #252B36;
  --accent: #A6B1FF;
  --accent-hover: #C6CDFF;
  --accent-soft: rgba(166, 177, 255, .08);
  --on-accent: #0E1014;
  --nav-bg: rgba(14, 16, 20, .88);
  --graph-opacity: .5;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0E1014;
    --surface: #161A21;
    --text: #EEF0F4;
    --text-secondary: #9AA2B2;
    --border: #252B36;
    --accent: #A6B1FF;
    --accent-hover: #C6CDFF;
    --accent-soft: rgba(166, 177, 255, .08);
    --on-accent: #0E1014;
    --nav-bg: rgba(14, 16, 20, .88);
    --graph-opacity: .5;
  }
}

/* ===== Reset / base ===== */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
.wrap { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
section { padding: var(--section-pad) 0; position: relative; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--text-secondary);
  margin: 0 0 16px;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: 60px;
  display: flex;
  align-items: center;
  background: var(--nav-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
}
.wordmark {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 17px;
  text-decoration: none;
  color: var(--text);
  white-space: nowrap;
}
.wordmark .dot { color: var(--accent); }
.main-nav {
  display: flex;
  gap: 22px;
  overflow-x: auto;
  scrollbar-width: none;
}
.main-nav::-webkit-scrollbar { display: none; }
.main-nav a {
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  padding-bottom: 2px;
}
.main-nav a::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 200ms var(--ease-out-quint);
}
.main-nav a:hover::after { transform: scaleX(1); }
.header-toggles { display: flex; gap: 8px; flex-shrink: 0; }
.toggle-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  border-radius: 999px;
  padding: 6px 12px;
  cursor: pointer;
  transition: border-color 150ms, color 150ms;
}
.toggle-btn:hover { border-color: var(--accent); color: var(--text); }
.scroll-progress {
  position: absolute;
  left: 0; bottom: -1px;
  height: 2px;
  width: 0%;
  background: var(--accent);
}
@media (max-width: 560px) { .main-nav { display: none; } }

/* ===== Hero ===== */
.hero { padding: 104px 0 88px; overflow: hidden; }
.hero-graph {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: var(--graph-opacity);
  pointer-events: none;
}
.hero-graph canvas {
  display: block;
  width: 100%;
  height: 100%;
  -webkit-mask-image: linear-gradient(to bottom, #000 55%, transparent 96%);
  mask-image: linear-gradient(to bottom, #000 55%, transparent 96%);
}
.hero-content { position: relative; z-index: 1; max-width: 740px; }
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--text-secondary);
  margin: 0 0 20px;
}
.hero h1 {
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 700;
  letter-spacing: -.03em;
  margin: 0 0 20px;
  line-height: 1.05;
}
.hero .reveal-mask { display: block; overflow: hidden; }
.hero .reveal-mask span { display: block; }
.hero-sub {
  font-size: clamp(19px, 2.2vw, 24px);
  color: var(--text-secondary);
  max-width: 660px;
  margin: 0 0 36px;
}
.hero-cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; }
.btn {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  padding: 13px 22px;
  border-radius: var(--radius);
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 120ms var(--ease-out-cubic), background 150ms, border-color 150ms;
  font-family: var(--font-sans);
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary { border-color: var(--border); color: var(--text); background: transparent; }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
}
.status-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

/* ===== Hairline-divider grids (stats, help list) ===== */
.hairline-grid {
  display: grid;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.stat-grid { grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); margin-top: 40px; }
.stat-cell { background: var(--surface); padding: 24px; }
.stat-num { font-family: var(--font-mono); font-weight: 600; font-size: 22px; color: var(--accent); margin: 0 0 6px; }
.stat-label { font-size: 13px; color: var(--text-secondary); }

.section-intro p { font-size: 18px; line-height: 1.65; color: var(--text-secondary); text-align: justify; text-justify: inter-word; hyphens: auto; }

/* ===== Stack cards ===== */
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(400px, 1fr)); gap: 20px; margin-top: 32px; }
.stack-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform 220ms var(--ease-out-quint), border-color 220ms, box-shadow 220ms;
}
.stack-card:hover { transform: translateY(-3px); border-color: var(--accent); box-shadow: 0 8px 24px rgba(0,0,0,.06); }
.stack-card h3 { font-size: 16px; font-weight: 600; margin: 0 0 14px; }
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-family: var(--font-mono);
  font-size: 12.5px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 9px;
  color: var(--text-secondary);
}
.stack-tail { margin-top: 24px; font-family: var(--font-mono); font-size: 13px; color: var(--text-secondary); }

/* ===== Case study cards ===== */
.case-list { display: flex; flex-direction: column; gap: 20px; margin-top: 32px; }
.case-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: 28px 30px;
  transition: transform 220ms var(--ease-out-quint), box-shadow 220ms;
}
.case-card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(0,0,0,.06); }
.case-card h3 { font-size: 22px; font-weight: 600; margin: 0 0 12px; }
.case-card p { color: var(--text-secondary); margin: 0 0 16px; text-align: justify; text-justify: inter-word; hyphens: auto; }
.metric-row { display: flex; flex-wrap: wrap; gap: 10px; }
.metric-chip {
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 13px;
}
.metric-chip b { color: var(--accent); font-family: var(--font-mono); }
.case-note {
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 24px;
  color: var(--text-secondary);
  font-size: 15px;
}

/* ===== Home lab ===== */
.lab-heading { font-size: clamp(26px, 3vw, 34px); font-weight: 600; letter-spacing: -.02em; margin: 0 0 16px; }
.lab-copy { font-size: 17px; line-height: 1.65; color: var(--text-secondary); text-align: justify; text-justify: inter-word; hyphens: auto; }
.lab-copy a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.lab-copy a:hover { color: var(--accent-hover); }
.lab-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 16px; margin-top: 32px; }
.lab-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  transition: transform 220ms var(--ease-out-quint), border-color 220ms;
}
.lab-card:hover { transform: translateY(-3px); border-color: var(--accent); }
.lab-card-title { font-family: var(--font-mono); font-weight: 600; font-size: 13px; margin: 0 0 6px; }
.lab-card-caption { font-size: 14px; color: var(--text-secondary); }

/* ===== Help list ===== */
.help-list { margin-top: 32px; }
.help-row { display: flex; align-items: baseline; gap: 18px; background: var(--surface); padding: 18px 20px; }
.help-index { font-family: var(--font-mono); font-weight: 600; color: var(--accent); flex-shrink: 0; }
.help-text { flex: 1; }

/* ===== Contact ===== */
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 48px; margin-top: 32px; }
.contact-heading { font-size: clamp(26px, 3vw, 34px); font-weight: 600; letter-spacing: -.02em; margin: 8px 0 16px; }
.contact-intro { color: var(--text-secondary); margin: 0 0 24px; }
.contact-row { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; font-size: 15px; }
.contact-row a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.contact-note { font-size: 14px; color: var(--text-secondary); margin: 20px 0; }
.contact-note a { color: var(--accent); }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }

.form-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; }
.form-field { margin-bottom: 18px; }
.form-field label { display: block; font-size: 13px; color: var(--text-secondary); margin-bottom: 6px; }
.form-field input, .form-field textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  padding: 11px 14px;
  font-family: var(--font-sans);
  font-size: 14px;
  outline: none;
}
.form-field input:focus, .form-field textarea:focus { border-color: var(--accent); }
.form-submit { width: 100%; }
.form-status { margin-top: 14px; font-size: 14px; }

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 26px 0;
}
.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
}

/* ===== Scroll reveal ===== */
.reveal { opacity: 0; transform: translateY(10px); transition: opacity 500ms var(--ease-out-quint), transform 500ms var(--ease-out-quint); }
.reveal.is-visible { opacity: 1; transform: none; }
.reveal-child { opacity: 0; transform: translateY(10px); transition: opacity 400ms var(--ease-out-quint), transform 400ms var(--ease-out-quint); }
.reveal.is-visible .reveal-child { opacity: 1; transform: none; }

/* ===== Hero entrance ===== */
.hero-eyebrow { opacity: 0; letter-spacing: .42em; transition: opacity 900ms var(--ease-out-quint), letter-spacing 900ms var(--ease-out-quint); transition-delay: 50ms; }
.hero-ready .hero-eyebrow { opacity: 1; letter-spacing: .14em; }
.hero .reveal-mask span { transform: translateY(110%); opacity: 0; transition: transform 800ms var(--ease-out-quint), opacity 800ms var(--ease-out-quint); }
.hero-ready .reveal-mask span { transform: translateY(0); opacity: 1; }
.hero .reveal-mask:nth-of-type(1) span { transition-delay: 180ms; }
.hero .reveal-mask:nth-of-type(2) span { transition-delay: 300ms; }
.hero-sub, .hero-cta-row { opacity: 0; transform: translateY(14px); transition: opacity 500ms var(--ease-out-quint), transform 500ms var(--ease-out-quint); }
.hero-ready .hero-sub { opacity: 1; transform: none; transition-delay: 550ms; }
.hero-ready .hero-cta-row { opacity: 1; transform: none; transition-delay: 680ms; }

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: 260ms !important; transition-timing-function: linear !important; }
  .reveal, .reveal-child { transform: none !important; }
  .hero .reveal-mask span { transform: none !important; }
  .hero-eyebrow { letter-spacing: .14em !important; }
  .stack-card:hover, .case-card:hover, .lab-card:hover { transform: none !important; }
}

/* ===== Responsive ===== */
@media (max-width: 820px) {
  .main-nav { max-width: 40vw; }
}
@media (max-width: 640px) {
  section { padding: 48px 0; }
  .hero { padding: 72px 0 56px; }
  .contact-grid { gap: 32px; }
}