/* ===== RESET ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* ===== TOKENS ===== */

:root {
  /* Spacing scale (base 4px) */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-6: 1.5rem;
  --sp-8: 2rem;
  --sp-12: 3rem;
  --sp-16: 4rem;
  --sp-24: 6rem;

  /* Typography */
  --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: ui-monospace, 'SF Mono', 'Cascadia Code', 'Fira Code', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.75rem;
  --text-5xl: 3.5rem;

  --leading-tight: 1.2;
  --leading-normal: 1.6;
  --tracking-tight: -0.02em;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;

  /* Layout */
  --container-max: 72rem;
  --header-height: 3.5rem;
}

/* --- Dark theme (default) --- */
[data-theme="dark"] {
  --ink: #f1f5f9;
  --ink-secondary: #94a3b8;
  --ink-muted: #64748b;
  --ink-faint: #475569;

  --surface: #0a0f1a;
  --surface-raised: #111827;
  --surface-overlay: #1e293b;

  --border: rgba(148, 163, 184, 0.12);
  --border-strong: rgba(148, 163, 184, 0.22);

  --accent: #38bdf8;
  --accent-hover: #7dd3fc;
  --accent-muted: rgba(56, 189, 248, 0.12);

  --terminal-bg: #0c1220;
  --terminal-border: rgba(148, 163, 184, 0.15);
  --terminal-dot-1: #ff5f57;
  --terminal-dot-2: #febc2e;
  --terminal-dot-3: #28c840;

  --badge-done-bg: rgba(34, 197, 94, 0.12);
  --badge-done-ink: #4ade80;
  --badge-planned-bg: rgba(148, 163, 184, 0.1);
  --badge-planned-ink: #94a3b8;

  --code-bg: rgba(148, 163, 184, 0.08);

  color-scheme: dark;
}

/* --- Light theme --- */
[data-theme="light"] {
  --ink: #0f172a;
  --ink-secondary: #475569;
  --ink-muted: #64748b;
  --ink-faint: #94a3b8;

  --surface: #f8fafc;
  --surface-raised: #ffffff;
  --surface-overlay: #f1f5f9;

  --border: rgba(15, 23, 42, 0.1);
  --border-strong: rgba(15, 23, 42, 0.18);

  --accent: #0284c7;
  --accent-hover: #0369a1;
  --accent-muted: rgba(2, 132, 199, 0.08);

  --terminal-bg: #f1f5f9;
  --terminal-border: rgba(15, 23, 42, 0.12);
  --terminal-dot-1: #ff5f57;
  --terminal-dot-2: #febc2e;
  --terminal-dot-3: #28c840;

  --badge-done-bg: rgba(22, 163, 74, 0.1);
  --badge-done-ink: #16a34a;
  --badge-planned-bg: rgba(100, 116, 139, 0.1);
  --badge-planned-ink: #64748b;

  --code-bg: rgba(15, 23, 42, 0.05);

  color-scheme: light;
}

/* --- Accessibility mode --- */
[data-a11y="true"] {
  --ink: #000000;
  --ink-secondary: #1a1a1a;
  --ink-muted: #333333;
  --ink-faint: #555555;
  --border: rgba(0, 0, 0, 0.3);
  --border-strong: rgba(0, 0, 0, 0.5);
  --accent: #005fcc;
  --accent-hover: #004099;

  font-size: 112.5%;
}

[data-a11y="true"][data-theme="dark"] {
  --ink: #ffffff;
  --ink-secondary: #e0e0e0;
  --ink-muted: #bbbbbb;
  --ink-faint: #999999;
  --border: rgba(255, 255, 255, 0.35);
  --border-strong: rgba(255, 255, 255, 0.55);
  --accent: #5cc8ff;
  --accent-hover: #8dd9ff;
}

[data-a11y="true"] * {
  transition-duration: 0ms !important;
  animation-duration: 0ms !important;
}

[data-a11y="true"] a {
  text-decoration: underline !important;
}

[data-a11y="true"] :focus-visible {
  outline: 3px solid var(--accent) !important;
  outline-offset: 3px !important;
}

/* ===== BASE ===== */

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--sp-4));
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--ink);
  background: var(--surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--accent-hover);
}

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

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 0.15em 0.35em;
  border-radius: var(--radius-sm);
}

pre code {
  background: none;
  padding: 0;
  font-size: var(--text-sm);
}

/* ===== SKIP LINK ===== */

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--sp-4);
  z-index: 9999;
  padding: var(--sp-2) var(--sp-4);
  background: var(--accent);
  color: var(--surface);
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
}
.skip-link:focus {
  top: var(--sp-2);
}

/* ===== CONTAINER ===== */

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--sp-6);
}

/* ===== HEADER ===== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: color-mix(in srgb, var(--surface) 85%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition-base);
}

.header-inner {
  display: flex;
  align-items: center;
  height: 100%;
  gap: var(--sp-6);
}

.logo-link {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  color: var(--ink);
  text-decoration: none;
  flex-shrink: 0;
}
.logo-link:hover {
  color: var(--ink);
}

.logo-icon {
  width: 1.5rem;
  height: 1.5rem;
}

.logo-text {
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
}

.main-nav {
  flex: 1;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--sp-1);
}

.nav-link {
  display: block;
  padding: var(--sp-2) var(--sp-3);
  color: var(--ink-secondary);
  font-size: var(--text-sm);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.nav-link:hover {
  color: var(--ink);
  background: var(--accent-muted);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.control-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: none;
  background: none;
  color: var(--ink-muted);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.control-btn:hover {
  color: var(--ink);
  background: var(--accent-muted);
}

.control-btn .icon {
  width: 1.125rem;
  height: 1.125rem;
}

[data-a11y="true"] #a11y-toggle {
  color: var(--accent);
  background: var(--accent-muted);
}

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

.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 2rem;
  height: 2rem;
  border: none;
  background: none;
  cursor: pointer;
  padding: 6px;
}

.burger-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--ink-muted);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.burger[aria-expanded="true"] .burger-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.burger[aria-expanded="true"] .burger-line:nth-child(2) {
  opacity: 0;
}
.burger[aria-expanded="true"] .burger-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.mobile-nav {
  background: var(--surface-raised);
  border-bottom: 1px solid var(--border);
  padding: var(--sp-4) var(--sp-6);
}

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

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.mobile-nav-link {
  display: block;
  padding: var(--sp-3) var(--sp-4);
  color: var(--ink-secondary);
  font-size: var(--text-base);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.mobile-nav-link:hover {
  color: var(--ink);
  background: var(--accent-muted);
}

/* ===== HERO ===== */

.hero {
  padding: var(--sp-24) 0 var(--sp-16);
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-12);
  align-items: center;
}

.hero-title {
  font-size: var(--text-5xl);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
}

.hero-subtitle {
  font-size: var(--text-xl);
  color: var(--ink-secondary);
  margin-top: var(--sp-3);
}

.hero-desc {
  color: var(--ink-muted);
  margin-top: var(--sp-4);
  max-width: 32rem;
}

.hero-actions {
  display: flex;
  gap: var(--sp-3);
  margin-top: var(--sp-8);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  padding: var(--sp-3) var(--sp-6);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: #0a0f1a;
}
.btn-primary:hover {
  background: var(--accent-hover);
  color: #0a0f1a;
}

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

/* ===== TERMINAL ===== */

.terminal {
  border: 1px solid var(--terminal-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--terminal-bg);
}

.terminal-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--terminal-border);
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink-faint);
  opacity: 0.5;
}
.terminal-dot:nth-child(1) { background: var(--terminal-dot-1); opacity: 0.7; }
.terminal-dot:nth-child(2) { background: var(--terminal-dot-2); opacity: 0.7; }
.terminal-dot:nth-child(3) { background: var(--terminal-dot-3); opacity: 0.7; }

.terminal-title {
  margin-left: var(--sp-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
}

.terminal-body {
  padding: var(--sp-4);
  overflow-x: auto;
}

.terminal-body pre {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.7;
  white-space: pre;
  color: var(--ink-secondary);
}

.terminal-sm .terminal-body {
  padding: var(--sp-3) var(--sp-4);
}

/* ===== TUI ELEMENTS ===== */

.tui-screen {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.7;
  color: #c9d1d9;
  width: 100%;
  min-width: 100%;
  flex-shrink: 0;
  padding: var(--sp-4) var(--sp-6);
  overflow: hidden;
  overflow-wrap: break-word;
}

.tui-banner {
  border: 1px dashed #4a5568;
  border-radius: 2px;
  padding: var(--sp-4) var(--sp-6);
  margin-bottom: var(--sp-4);
  text-align: center;
}

.tui-banner-title {
  display: block;
  color: #56d4dd;
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: 0.35em;
}

.tui-banner-sub {
  display: block;
  color: #6b7280;
  font-size: var(--text-sm);
  margin-top: var(--sp-1);
}

.tui-info {
  color: #c9d1d9;
  padding: var(--sp-1) 0;
}

.tui-info-label {
  color: #6b7280;
  display: inline-block;
  min-width: 7ch;
}

.tui-info-value {
  color: #c9d1d9;
}

.tui-hint {
  color: #4a5568;
  font-size: var(--text-xs);
}

.tui-separator {
  border: none;
  border-top: 1px solid #2d3748;
  margin: var(--sp-3) 0;
}

.tui-spacer {
  height: var(--sp-2);
}

.tui-prompt {
  color: #c9d1d9;
}

.tui-prompt-marker {
  color: #4ade80;
  font-weight: 700;
  margin-right: 0.5ch;
}

.tui-agent {
  color: #2dd4bf;
  font-weight: 600;
  margin-top: var(--sp-1);
}

.tui-tool {
  color: #c9d1d9;
  padding: var(--sp-1) 0;
  display: flex;
  align-items: center;
  gap: 0.5ch;
}

.tui-tool-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #60a5fa;
  flex-shrink: 0;
}

.tui-md-h3 {
  font-size: var(--text-lg);
  font-weight: 700;
  color: #e2e8f0;
}

.tui-md-h4 {
  font-size: var(--text-base);
  font-weight: 600;
  color: #e2e8f0;
}

.tui-md-text {
  color: #c9d1d9;
  line-height: 1.7;
}

.tui-md-code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: rgba(110, 118, 129, 0.2);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  color: #e2e8f0;
}

@keyframes tui-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.tui-cursor::after {
  content: '\2588';
  color: #c9d1d9;
  animation: tui-blink 1s step-end infinite;
}

.tui-statusbar {
  display: flex;
  align-items: center;
  gap: 0;
  margin-top: var(--sp-3);
  padding-top: var(--sp-2);
  border-top: 1px solid #2d3748;
  color: #6b7280;
  font-size: var(--text-xs);
  flex-wrap: wrap;
}

.tui-statusbar-sep::before {
  content: '\00b7';
  margin: 0 0.6ch;
}

/* ===== GALLERY ===== */

.hero-gallery {
  min-width: 0;
}

.hero-gallery .terminal {
  background: #0d1117;
  border-color: rgba(148, 163, 184, 0.15);
}

.gallery-viewport {
  overflow: hidden;
  position: relative;
  min-width: 0;
  max-width: 100%;
}

.gallery-track {
  display: flex;
  transition: transform 0.4s ease;
}

.gallery-dots {
  display: flex;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-3);
  border-top: 1px solid rgba(148, 163, 184, 0.1);
}

.gallery-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1px solid #4a5568;
  background: transparent;
  cursor: pointer;
  padding: 0;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.gallery-dot:hover {
  border-color: #94a3b8;
}

.gallery-dot-active {
  background: #56d4dd;
  border-color: #56d4dd;
}

/* ===== MCP DEMO ===== */

.mcp-demo {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: var(--sp-8);
  align-items: start;
  overflow: hidden;
}

.mcp-demo-text {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.mcp-demo-title {
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
}

.mcp-demo-desc {
  color: var(--ink-muted);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
}

.mcp-link {
  align-self: flex-start;
  margin-top: var(--sp-2);
}

.mcp-demo-terminal {
  min-width: 0;
  overflow: hidden;
}

.mcp-demo-terminal .terminal {
  background: #0d1117;
  border-color: rgba(148, 163, 184, 0.15);
}

.mcp-demo-terminal .gallery-track .tui-screen {
  min-width: 100%;
  flex-shrink: 0;
  max-height: 28rem;
  overflow-y: auto;
}

.tui-mcp-prefix {
  color: #4ade80;
  font-weight: 600;
  margin-right: 0.3ch;
}

.tui-connect {
  color: #6b7280;
  padding: var(--sp-1) 0;
}

.tui-md-h2 {
  font-size: var(--text-xl);
  font-weight: 700;
  color: #e2e8f0;
}

.tui-list-item {
  color: #c9d1d9;
  padding-top: var(--sp-1);
}

.tui-list-item strong {
  color: #e2e8f0;
}

.tui-list-meta {
  color: #6b7280;
  font-size: 0.7rem;
  padding-left: 2ch;
}

/* ===== SECTIONS ===== */

.section {
  padding: var(--sp-16) 0;
}

.section-alt {
  background: var(--surface-raised);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  margin-bottom: var(--sp-4);
}

.section-desc {
  color: var(--ink-muted);
  max-width: 40rem;
  margin-bottom: var(--sp-12);
}

.section-subtitle {
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  margin-top: var(--sp-16);
  margin-bottom: var(--sp-8);
}

/* ===== FEATURES ===== */

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-6);
}

.feature-card {
  padding: var(--sp-6);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-fast);
}
.feature-card:hover {
  border-color: var(--border-strong);
}

.feature-icon {
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--sp-4);
  color: var(--accent);
}
.feature-icon svg {
  width: 1.5rem;
  height: 1.5rem;
}

.feature-title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--sp-2);
}

.feature-desc {
  color: var(--ink-muted);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
}

/* ===== TOOLS ===== */

.tools-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
}

.tool-chip {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: var(--sp-3) var(--sp-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: default;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}
.tool-chip:hover,
.tool-chip:focus-visible {
  border-color: var(--accent);
  background: var(--accent-muted);
}

.tool-name {
  font-size: var(--text-sm);
  font-weight: 600;
  background: none;
  padding: 0;
}

.tool-desc {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
  background: var(--surface-overlay);
  color: var(--ink-secondary);
  font-size: var(--text-xs);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-strong);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-fast);
  z-index: 10;
}

.tool-chip:hover .tool-desc,
.tool-chip:focus-visible .tool-desc {
  opacity: 1;
}

/* ===== CONTEXT DIAGRAM ===== */

.context-diagram {
  max-width: 36rem;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.ctx-layer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--sp-4) var(--sp-6);
  border-bottom: 1px solid var(--border);
  font-size: var(--text-sm);
}
.ctx-layer:last-child {
  border-bottom: none;
}

.ctx-label {
  font-weight: 600;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.ctx-meta {
  color: var(--ink-muted);
  font-size: var(--text-xs);
}

.ctx-system { background: var(--accent-muted); }
.ctx-timeline { border-left: 3px solid var(--accent); }
.ctx-relevant { border-left: 3px solid var(--ink-muted); }
.ctx-recent { border-left: 3px solid var(--ink-faint); }
.ctx-current { background: var(--accent-muted); }
.ctx-completion { opacity: 0.6; }

/* ===== QUICKSTART ===== */

.quickstart-steps {
  display: flex;
  flex-direction: column;
  gap: var(--sp-8);
}

.qs-step-title {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--sp-4);
}

.qs-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 50%;
  flex-shrink: 0;
}

.models-table-wrap {
  overflow-x: auto;
  margin-top: var(--sp-2);
}

.models-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}
.models-table th,
.models-table td {
  text-align: left;
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--border);
}
.models-table th {
  font-weight: 600;
  color: var(--ink-muted);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.models-table td code {
  font-weight: 600;
}

/* ===== DOWNLOAD TABLE ===== */

.download-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.download-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.download-table th,
.download-table td {
  text-align: left;
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.download-table th {
  font-weight: 600;
  color: var(--ink-muted);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.download-link {
  color: var(--accent);
  text-decoration: none;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--text-sm);
}

.download-link:hover {
  text-decoration: underline;
}

.download-size {
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.download-footer {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-top: var(--sp-6);
  font-size: var(--text-sm);
}

.download-meta-link {
  color: var(--ink-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.download-meta-link:hover {
  color: var(--accent);
}

.download-footer-sep {
  color: var(--ink-faint);
}

.qs-note {
  color: var(--ink-muted);
  font-size: var(--text-sm);
  margin-top: var(--sp-4);
}

/* ===== ROADMAP ===== */

.roadmap-timeline {
  position: relative;
  padding-left: var(--sp-8);
}

.roadmap-timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border-strong);
}

.roadmap-item {
  position: relative;
  padding-bottom: var(--sp-8);
}
.roadmap-item:last-child {
  padding-bottom: 0;
}

.roadmap-marker {
  position: absolute;
  left: calc(-1 * var(--sp-8) + 2px);
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  background: var(--surface);
}

.roadmap-done .roadmap-marker {
  background: var(--badge-done-ink);
  border-color: var(--badge-done-ink);
}

.roadmap-content {
  padding-top: 0;
}

.roadmap-badge {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 2px var(--sp-2);
  border-radius: var(--radius-sm);
  margin-bottom: var(--sp-2);
}

.badge-done {
  background: var(--badge-done-bg);
  color: var(--badge-done-ink);
}
.badge-planned {
  background: var(--badge-planned-bg);
  color: var(--badge-planned-ink);
}

.roadmap-title {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--sp-1);
}

.roadmap-desc {
  color: var(--ink-muted);
  font-size: var(--text-sm);
}

/* Future cards */
.future-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-4);
}

.future-card {
  padding: var(--sp-6);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.future-title {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--sp-2);
}

.future-desc {
  font-size: var(--text-sm);
  color: var(--ink-muted);
}

/* ===== FOOTER ===== */

.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--sp-12) 0;
}

.footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--sp-8);
}

.footer-brand {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
}

.footer-logo {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--ink-muted);
}

.footer-tagline {
  color: var(--ink-muted);
  font-size: var(--text-sm);
  max-width: 20rem;
}

.footer-links {
  display: flex;
  gap: var(--sp-4);
}

.footer-link {
  color: var(--ink-secondary);
  font-size: var(--text-sm);
}
.footer-link:hover {
  color: var(--accent);
}

.footer-copy {
  color: var(--ink-faint);
  font-size: var(--text-xs);
  white-space: nowrap;
}

/* ===== FADE IN ANIMATION ===== */

.fade-in {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== RESPONSIVE: TABLET ===== */

@media (max-width: 768px) {
  :root {
    --text-5xl: 2.5rem;
    --text-4xl: 2rem;
    --text-3xl: 1.75rem;
  }

  .main-nav {
    display: none;
  }

  .burger {
    display: flex;
  }

  .hero {
    padding: var(--sp-16) 0 var(--sp-12);
  }

  .hero .container {
    grid-template-columns: 1fr;
    gap: var(--sp-8);
  }

  .hero-gallery {
    max-width: 100%;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .future-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .mcp-demo {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    gap: var(--sp-4);
  }
}

/* ===== RESPONSIVE: MOBILE ===== */

@media (max-width: 480px) {
  :root {
    --text-5xl: 2rem;
    --text-3xl: 1.5rem;
  }

  .container {
    padding: 0 var(--sp-4);
  }

  .hero {
    padding: var(--sp-12) 0 var(--sp-8);
  }

  .hero-actions {
    flex-direction: column;
  }
  .hero-actions .btn {
    text-align: center;
    justify-content: center;
  }

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

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

  .section {
    padding: var(--sp-12) 0;
  }

  .tool-desc {
    display: none;
  }

  .tui-screen {
    padding: var(--sp-3) var(--sp-3);
    font-size: 0.7rem;
  }

  .tui-statusbar {
    font-size: 0.6rem;
  }

  .ctx-layer {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-1);
  }
}