/* ==========================================================================
   INTLLM — Minimalist Developer Design System
   Philosophy: Ollama-style minimalism + INTLLM identity + subtle motion
   Palette: Strict Black + White + Ash monochrome (#000000, #FFFFFF, #FAFAFA,
            #F5F5F5, #E5E5E5, #D4D4D4, #A3A3A3, #737373, #404040, #262626, #171717, #0A0A0A)
   ========================================================================== */

/* ---- Theme Tokens -------------------------------------------------------- */
:root {
  /* Light mode — pure, high-contrast, strict black/white/ash */
  --bg: #FFFFFF;
  --bg-subtle: #FAFAFA;
  --bg-muted: #F5F5F5;
  --bg-elevated: #FFFFFF;
  --border: #E5E5E5;
  --border-subtle: #F5F5F5;
  --border-strong: #A3A3A3;
  --text: #000000;
  --text-2: #404040;
  --text-muted: #737373;
  --text-subtle: #A3A3A3;

  --accent: #000000;
  --accent-contrast: #FFFFFF;
  --code-bg: #F5F5F5;
  --terminal-bg: #FAFAFA;
  --terminal-header-bg: #F5F5F5;
  --terminal-text: #171717;
  --terminal-border: #E5E5E5;
  --terminal-prompt: #737373;
  --terminal-cursor: #171717;
  --dot-accent: #737373;

  /* Ash palette tokens */
  --ash-50: #FAFAFA;
  --ash-100: #F5F5F5;
  --ash-200: #E5E5E5;
  --ash-300: #D4D4D4;
  --ash-400: #A3A3A3;
  --ash-500: #737373;
  --ash-600: #404040;
  --ash-700: #262626;
  --ash-800: #171717;
  --ash-900: #0A0A0A;

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

  --radius-sm: 4px;
  --radius: 6px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --radius-pill: 9999px;

  --header-h: 60px;
  --max-w: 1040px;
  --max-w-narrow: 740px;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --speed-fast: 150ms;
  --speed-norm: 250ms;
  --speed-slow: 400ms;
}

html[data-theme="dark"] {
  /* Dark mode — genuine dark black, no navy/purple tint */
  --bg: #000000;
  --bg-subtle: #0A0A0A;
  --bg-muted: #171717;
  --bg-elevated: #111111;
  --border: #262626;
  --border-subtle: #171717;
  --border-strong: #737373;
  --text: #FFFFFF;
  --text-2: #D4D4D4;
  --text-muted: #A3A3A3;
  --text-subtle: #737373;

  --accent: #FFFFFF;
  --accent-contrast: #000000;
  --code-bg: #0A0A0A;
  --terminal-bg: #0A0A0A;
  --terminal-header-bg: #141414;
  --terminal-text: #EDEDED;
  --terminal-border: #262626;
  --terminal-prompt: #808080;
  --terminal-cursor: #FFFFFF;
  --dot-accent: #A3A3A3;
}

/* ---- Reset & Base -------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  background-color: var(--bg);
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  transition: background-color var(--speed-norm) var(--ease), color var(--speed-norm) var(--ease);
  opacity: 1;
  transform: translateY(0);
}

/* Subtle Page Transition */
body.is-transitioning-out {
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity 220ms var(--ease), transform 220ms var(--ease);
}

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

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

/* Accessibility skip link */
.skip-link {
  position: absolute;
  top: -60px;
  left: 16px;
  z-index: 1000;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 8px 14px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 500;
  transition: top var(--speed-fast) var(--ease);
}
.skip-link:focus {
  top: 16px;
}

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

/* ---- Layout Containers --------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.container--narrow {
  max-width: var(--max-w-narrow);
}

/* ---- Minimal Navigation -------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: transparent;
  transition: background-color var(--speed-norm) var(--ease),
              border-color var(--speed-norm) var(--ease),
              backdrop-filter var(--speed-norm) var(--ease);
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--border);
}

html[data-theme="dark"] .site-header.is-scrolled {
  background: rgba(0, 0, 0, 0.88);
  border-bottom-color: var(--border);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: opacity var(--speed-fast) var(--ease);
}
.brand:hover {
  opacity: 0.8;
}

.brand-logo {
  height: 24px;
  width: auto;
  object-fit: contain;
}

html[data-theme="light"] .brand-logo.logo-dark {
  display: none;
}
html[data-theme="dark"] .brand-logo.logo-light {
  display: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 14px;
  font-weight: 450;
  color: var(--text-muted);
  transition: color var(--speed-fast) var(--ease);
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--text);
}

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 0;
  right: 0;
  height: 1.5px;
  background-color: var(--text);
}

.nav-github-icon {
  width: 15px;
  height: 15px;
  fill: currentColor;
}

/* Theme Switcher Button */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 6px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color var(--speed-fast) var(--ease),
              background-color var(--speed-fast) var(--ease),
              transform var(--speed-fast) var(--ease);
}
.theme-toggle:hover {
  color: var(--text);
  background-color: var(--bg-muted);
  transform: scale(1.05);
}
.theme-toggle:active {
  transform: scale(0.95);
}
.theme-toggle svg {
  width: 16px;
  height: 16px;
}

html[data-theme="light"] .icon-sun {
  display: none;
}
html[data-theme="dark"] .icon-moon {
  display: none;
}

/* ---- Intro / Loading Experience ------------------------------------------ */
.site-intro {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg);
  opacity: 1;
  visibility: visible;
  transition: opacity 350ms var(--ease), visibility 350ms var(--ease);
}

.site-intro.is-leaving {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.intro-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.intro-logo-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
}

.intro-logo {
  height: 38px;
  width: auto;
  opacity: 0;
  transform: scale(0.94);
  transition: opacity 400ms var(--ease), transform 400ms var(--ease);
}

.site-intro.is-playing .intro-logo {
  opacity: 1;
  transform: scale(1);
}

html[data-theme="light"] .intro-logo.logo-dark {
  display: none;
}
html[data-theme="dark"] .intro-logo.logo-light {
  display: none;
}

.intro-line {
  width: 0;
  height: 1px;
  background-color: var(--border-strong);
  margin: 18px auto 14px;
  transition: width 350ms var(--ease);
}

.site-intro.is-revealing .intro-line {
  width: 90px;
}

.intro-status {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  opacity: 0;
  transition: opacity 300ms var(--ease);
}

.site-intro.is-revealing .intro-status {
  opacity: 1;
}

/* ---- Hero Section (Centered Minimal Composition) ------------------------- */
.hero {
  padding: 88px 0 72px;
  position: relative;
  overflow: hidden;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(var(--border-strong) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(circle at 50% 32%, black 20%, transparent 72%);
  -webkit-mask-image: radial-gradient(circle at 50% 32%, black 20%, transparent 72%);
  opacity: 0.28;
  z-index: 0;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
}

/* Medium-size INTLLM Branding */
.hero-brand-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 24px;
}

.hero-brand-logo {
  height: 44px;
  width: auto;
  max-width: 200px;
  object-fit: contain;
  margin-bottom: 12px;
}

html[data-theme="light"] .hero-brand-logo.logo-dark {
  display: none;
}
html[data-theme="dark"] .hero-brand-logo.logo-light {
  display: none;
}

.hero-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: var(--bg-muted);
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--text);
  animation: pulseDot 2.4s ease-in-out infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* Short Powerful Headline */
.hero-title {
  font-size: clamp(2.3rem, 5.2vw, 4.2rem);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.04em;
  color: var(--text);
  max-width: 820px;
  margin-bottom: 20px;
  text-wrap: balance;
}

.hero-title .hero-br {
  display: block;
}

/* One Concise Explanation */
.hero-desc {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  line-height: 1.55;
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto 36px;
  font-weight: 400;
  letter-spacing: -0.01em;
}

/* Platform Buttons (Compact Product Controls) */
.hero-platforms {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.platform-btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: transform var(--speed-fast) var(--ease),
              border-color var(--speed-fast) var(--ease),
              background-color var(--speed-fast) var(--ease),
              box-shadow var(--speed-fast) var(--ease);
  user-select: none;
}

.platform-btn-icon {
  width: 15px;
  height: 15px;
  fill: currentColor;
  transition: transform var(--speed-fast) var(--ease);
}

.platform-btn:hover {
  transform: translateY(-2.5px);
  border-color: var(--border-strong);
  background-color: var(--bg-muted);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.platform-btn:hover .platform-btn-icon {
  transform: translateY(-1px) scale(1.04);
}

.platform-btn:active {
  transform: translateY(1px) scale(0.98);
}

.platform-btn.is-active {
  border-color: var(--border-strong);
  background-color: var(--bg-muted);
  font-weight: 600;
}

/* Transformation Terminal Widget */
.hero-terminal-wrap {
  width: 100%;
  max-width: 680px;
  margin: 0 auto 16px;
}

.terminal-box {
  background-color: var(--terminal-bg);
  border: 1px solid var(--terminal-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
  transition: border-color var(--speed-norm) var(--ease);
  text-align: left;
}

.terminal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--terminal-border);
  background: var(--terminal-header-bg);
}

.terminal-tabs {
  display: flex;
  gap: 4px;
}

.terminal-tab {
  background: none;
  border: 1px solid transparent;
  color: var(--text-subtle);
  font-size: 12.5px;
  font-family: var(--font-sans);
  font-weight: 500;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color var(--speed-fast) var(--ease),
              background-color var(--speed-fast) var(--ease),
              border-color var(--speed-fast) var(--ease);
}

.terminal-tab:hover {
  color: var(--text);
  background-color: var(--bg-muted);
}

.terminal-tab.is-active {
  color: var(--text);
  background-color: var(--bg);
  border-color: var(--border);
  font-weight: 550;
}

.terminal-label-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.terminal-status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--dot-accent);
}

.terminal-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 500;
}

.terminal-os-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-subtle);
}

.terminal-body {
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.terminal-command {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--terminal-text);
  overflow-x: auto;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
}

.terminal-prompt {
  color: var(--terminal-prompt);
  user-select: none;
  font-weight: 500;
}

.terminal-cursor {
  display: inline-block;
  width: 8px;
  height: 15px;
  background-color: var(--terminal-cursor);
  margin-left: 2px;
  animation: blinkCursor 0.9s steps(2, start) infinite;
  transition: opacity 300ms var(--ease);
}

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

.copy-btn {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  color: var(--text-2);
  padding: 6px 12px;
  font-size: 12px;
  font-family: var(--font-sans);
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background-color var(--speed-fast) var(--ease),
              border-color var(--speed-fast) var(--ease),
              color var(--speed-fast) var(--ease),
              transform var(--speed-fast) var(--ease);
  flex-shrink: 0;
}

.copy-btn:hover {
  background: var(--bg-muted);
  color: var(--text);
  border-color: var(--border-strong);
}

.copy-btn:active {
  transform: translateY(1px) scale(0.97);
}

.copy-btn.is-copied {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
  font-weight: 600;
}

.terminal-footer-notes {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-top: 1px solid var(--terminal-border);
  font-size: 12px;
  color: var(--text-subtle);
}

.terminal-footer-notes a {
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--speed-fast) var(--ease);
}
.terminal-footer-notes a:hover {
  color: var(--text);
}

/* ---- Buttons ------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius);
  transition: all var(--speed-fast) var(--ease);
  cursor: pointer;
  white-space: nowrap;
}

.btn--primary {
  background-color: var(--accent);
  color: var(--accent-contrast);
  border: 1px solid var(--accent);
}
.btn--primary:hover {
  opacity: 0.88;
  transform: translateY(-1px);
}
.btn--primary .arrow {
  transition: transform var(--speed-fast) var(--ease);
}
.btn--primary:hover .arrow {
  transform: translateX(3px);
}

.btn--secondary {
  background-color: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn--secondary:hover {
  border-color: var(--border-strong);
  background-color: var(--bg-subtle);
  transform: translateY(-1px);
}
.btn--secondary .arrow {
  transition: transform var(--speed-fast) var(--ease);
}
.btn--secondary:hover .arrow {
  transform: translateX(3px);
}

.btn:active {
  transform: translateY(1px) scale(0.985);
  transition-duration: 60ms;
}

.btn--primary:active {
  opacity: 0.8;
}

/* ---- Section 01: How It Works (Three Feature Blocks & Pipeline) ----------- */
.section {
  padding: 80px 0;
  border-top: 1px solid var(--border);
}

.section-label {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-subtle);
  margin-bottom: 12px;
}

.section-heading {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin-bottom: 20px;
  color: var(--text);
}

.prose-lead {
  font-size: 18px;
  line-height: 1.65;
  color: var(--text-2);
  margin-bottom: 24px;
  max-width: 780px;
}

.prose {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-muted);
  max-width: 780px;
  margin-bottom: 32px;
}

/* Three Feature Blocks */
.how-blocks-wrap {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  margin: 36px 0 28px;
}

.how-block {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  transition: transform var(--speed-fast) var(--ease),
              border-color var(--speed-fast) var(--ease),
              background-color var(--speed-fast) var(--ease);
}

.how-block:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  background-color: var(--bg-muted);
}

.how-block-icon {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  margin-bottom: 14px;
}

.how-block-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--text-subtle);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.how-block-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.how-block-desc {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.55;
}

.how-block-operator {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 500;
  color: var(--text-subtle);
  text-align: center;
}

/* Convergence Flow */
.how-convergence {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-top: 10px;
}

.convergence-arrow-down {
  color: var(--border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px 0;
}

.convergence-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--bg);
  border: 1px solid var(--text);
  border-radius: var(--radius);
  padding: 12px 28px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.convergence-core-title {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text);
  text-transform: uppercase;
}

.convergence-core-sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

.convergence-outcome {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-2);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background-color: var(--bg-muted);
  border: 1px solid var(--border);
}

/* Linear Typographic Pipeline */
.pipeline-track {
  margin: 36px 0 20px;
  padding: 24px;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
}

.pipeline-items {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 600px;
}

.pipeline-node {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.pipeline-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-subtle);
}

.pipeline-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.pipeline-arrow {
  color: var(--text-subtle);
  font-size: 16px;
  user-select: none;
}

/* ---- Section 02: Architecture Flow Visualization ------------------------- */
.arch-visual-wrap {
  margin: 36px 0 24px;
  padding: 32px 28px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.arch-svg-container {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
}

.arch-path {
  stroke: var(--border-strong);
  stroke-width: 1.5;
  fill: none;
}

.arch-path-animated {
  stroke: var(--text);
  stroke-width: 1.75;
  stroke-dasharray: 6 12;
  animation: signalFlow 2.8s linear infinite;
  fill: none;
}

@keyframes signalFlow {
  from {
    stroke-dashoffset: 36;
  }
  to {
    stroke-dashoffset: 0;
  }
}

.arch-box {
  fill: var(--bg);
  stroke: var(--border);
  stroke-width: 1;
  rx: 4;
}

.arch-box-core {
  fill: var(--bg-elevated);
  stroke: var(--text);
  stroke-width: 1.5;
  rx: 6;
}

.arch-text {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  fill: var(--text);
  text-anchor: middle;
  dominant-baseline: middle;
}

.arch-text-core {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  fill: var(--text);
  text-anchor: middle;
  dominant-baseline: middle;
}

.arch-text-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  fill: var(--text-subtle);
  text-anchor: middle;
  dominant-baseline: middle;
}

/* System Layers Section (Typography & Lines) */
.system-layers {
  margin-top: 48px;
  display: flex;
  flex-direction: column;
}

.layer-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  align-items: baseline;
  transition: background-color var(--speed-fast) var(--ease);
}
.layer-row:first-child {
  border-top: 1px solid var(--border);
}
.layer-row:hover {
  background-color: var(--bg-subtle);
}

.layer-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.layer-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-subtle);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

.layer-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ---- Download / CTA Section ---------------------------------------------- */
.cta-section {
  padding: 80px 0;
  border-top: 1px solid var(--border);
}

.cta-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.cta-info h3 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 600;
  letter-spacing: -0.025em;
  margin-bottom: 8px;
}

.cta-info p {
  color: var(--text-muted);
  font-size: 15px;
}

.cta-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ---- GitHub Section ------------------------------------------------------ */
.github-strip {
  padding: 36px 0;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 14px;
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  color: var(--text);
  transition: opacity var(--speed-fast) var(--ease);
}
.github-link:hover {
  opacity: 0.8;
}
.github-link .arrow {
  transition: transform var(--speed-fast) var(--ease);
}
.github-link:hover .arrow {
  transform: translateX(4px);
}

/* ---- Documentation Page Layout (/info) ----------------------------------- */
.doc-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 48px;
  padding: 48px 0 96px;
  align-items: start;
}

.doc-sidebar {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  max-height: calc(100vh - var(--header-h) - 48px);
  overflow-y: auto;
}

.doc-nav-title {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-subtle);
  margin-bottom: 14px;
}

.doc-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.doc-nav-link {
  font-size: 13.5px;
  color: var(--text-muted);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: all var(--speed-fast) var(--ease);
  display: block;
}
.doc-nav-link:hover {
  color: var(--text);
  background-color: var(--bg-subtle);
}
.doc-nav-link.is-active {
  color: var(--text);
  background-color: var(--bg-muted);
  font-weight: 550;
}

.doc-content {
  max-width: 720px;
}

.doc-section {
  padding-bottom: 56px;
  margin-bottom: 56px;
  border-bottom: 1px solid var(--border);
}
.doc-section:last-child {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 0;
}

.doc-section h2 {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.doc-section h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 28px 0 12px;
  color: var(--text);
}

.doc-section p {
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 18px;
}

.doc-section ul {
  padding-left: 20px;
  margin-bottom: 20px;
  color: var(--text-2);
}
.doc-section li {
  margin-bottom: 8px;
  line-height: 1.6;
}

/* Minimalist Clean Table */
.clean-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  margin: 24px 0;
}
.clean-table th {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-strong);
  font-weight: 600;
  color: var(--text);
}
.clean-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text-2);
}
.clean-table code {
  font-family: var(--font-mono);
  font-size: 12px;
  background-color: var(--code-bg);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

/* Minimal Code Snippet */
.code-card {
  background-color: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 20px 0;
  position: relative;
}
.code-card pre {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--text);
  overflow-x: auto;
}

/* Collapsible FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg);
  transition: border-color var(--speed-fast) var(--ease);
}
.faq-item:hover {
  border-color: var(--border-strong);
}

.faq-question {
  width: 100%;
  padding: 16px 20px;
  text-align: left;
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.faq-icon {
  width: 14px;
  height: 14px;
  transition: transform var(--speed-fast) var(--ease);
  color: var(--text-subtle);
  flex-shrink: 0;
}
.faq-item.is-open .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 20px 18px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.65;
  display: none;
}
.faq-item.is-open .faq-answer {
  display: block;
}

/* ---- Download Page Layout (/download) ------------------------------------- */
.download-page {
  padding: 56px 0 96px;
}

.platform-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 36px;
}

.platform-row {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  background-color: var(--bg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  transition: border-color var(--speed-fast) var(--ease);
}
.platform-row:hover {
  border-color: var(--border-strong);
}

.platform-meta h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 4px;
}

.platform-meta p {
  font-size: 13.5px;
  color: var(--text-muted);
}

.platform-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* ---- Author Page Layout (/author) ---------------------------------------- */
.author-page {
  padding: 80px 0 120px;
}

.author-header {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 36px;
}

.author-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  border: 1px solid var(--border);
}

.author-name {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.author-role {
  color: var(--text-muted);
  font-size: 15px;
}

.author-bio {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-2);
  margin-bottom: 36px;
}

.author-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---- Minimal Footer ------------------------------------------------------ */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  font-size: 13px;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-brand {
  font-weight: 600;
  color: var(--text);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.footer-link {
  color: var(--text-muted);
  transition: color var(--speed-fast) var(--ease);
}
.footer-link:hover {
  color: var(--text);
}

/* ---- Sequential Reveal & Motion System ------------------------------------ */
.reveal-hero {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 400ms var(--ease), transform 400ms var(--ease);
}

.reveal-hero.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-up {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--speed-slow) var(--ease), transform var(--speed-slow) var(--ease);
}

.reveal-up.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Respect prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  body {
    transform: none !important;
    opacity: 1 !important;
  }
  .reveal-hero, .reveal-up {
    opacity: 1 !important;
    transform: none !important;
  }
  .arch-path-animated {
    animation: none !important;
    stroke-dasharray: none !important;
  }
  .site-intro {
    display: none !important;
  }
}

/* ---- Responsive Breakpoints ---------------------------------------------- */
@media (max-width: 860px) {
  .how-blocks-wrap {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .how-block-operator {
    display: none;
  }
  .doc-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .doc-sidebar {
    position: static;
    border-bottom: 1px solid var(--border);
    padding-bottom: 20px;
    max-height: none;
  }
  .doc-nav-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
  }
  .layer-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (max-width: 640px) {
  :root {
    --header-h: 56px;
  }
  .hero {
    padding: 56px 0 44px;
  }
  .hero-title .hero-br {
    display: inline;
  }
  .terminal-body {
    flex-direction: column;
    align-items: stretch;
  }
  .copy-btn {
    align-self: flex-start;
  }
  .site-nav {
    gap: 16px;
  }
  .nav-link {
    font-size: 13px;
  }
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
  .hero-platforms {
    width: 100%;
  }
  .platform-btn {
    flex: 1 1 calc(33.333% - 10px);
    justify-content: center;
    padding: 9px 10px;
    font-size: 12.5px;
  }
}

/* ---- Ollama Branding ----------------------------------------------------- */
.ollama-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--text-subtle);
  vertical-align: middle;
}

.ollama-badge svg,
.ollama-icon {
  width: 15px;
  height: 15px;
  display: inline-block;
  vertical-align: -2px;
  fill: currentColor;
}

/* ---- Download & Platform Icons ------------------------------------------- */
.platform-icon-inline {
  width: 18px;
  height: 18px;
  display: inline-block;
  vertical-align: -2px;
  margin-right: 8px;
  fill: currentColor;
  flex-shrink: 0;
}

.platform-meta h3 {
  display: flex;
  align-items: center;
}

/* ---- Author Signature Branding ------------------------------------------- */
.creator-signature-strip {
  padding: 24px 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-subtle);
  border-top: 1px solid var(--border-subtle);
  text-align: center;
  flex-wrap: wrap;
}

.creator-signature-text a,
.footer-author {
  color: var(--text-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--speed-fast) var(--ease), border-color var(--speed-fast) var(--ease);
}

.creator-signature-text a:hover,
.footer-author:hover {
  color: var(--text);
  border-color: var(--border-strong);
}

.footer-divider {
  color: var(--text-subtle);
  user-select: none;
}

/* ---- Staggered Section Reveals & Micro-Interactions ---------------------- */
.reveal-up:nth-child(2) { transition-delay: 40ms; }
.reveal-up:nth-child(3) { transition-delay: 80ms; }
.reveal-up:nth-child(4) { transition-delay: 120ms; }

.how-block {
  transition: transform var(--speed-fast) var(--ease),
              border-color var(--speed-fast) var(--ease),
              background-color var(--speed-fast) var(--ease);
}

.how-block:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
}

.how-block-icon {
  transition: transform var(--speed-fast) var(--ease);
}

.how-block:hover .how-block-icon {
  transform: translateY(-1.5px);
}

.pipeline-node {
  transition: transform var(--speed-fast) var(--ease);
}
.pipeline-node:hover {
  transform: translateY(-1.5px);
}

.layer-row {
  transition: background-color var(--speed-fast) var(--ease),
              opacity var(--speed-slow) var(--ease),
              transform var(--speed-slow) var(--ease);
}

.platform-row {
  transition: border-color var(--speed-fast) var(--ease),
              transform var(--speed-fast) var(--ease);
}
.platform-row:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.author-link-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  padding: 10px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--speed-fast) var(--ease);
}
.author-link-item:hover {
  border-color: var(--border-strong);
  background-color: var(--bg-subtle);
  transform: translateY(-2px);
}
.author-link-item:active {
  transform: translateY(1px) scale(0.98);
}
.author-link-item .arrow {
  transition: transform var(--speed-fast) var(--ease);
}
.author-link-item:hover .arrow {
  transform: translateX(3px);
}