/* ========================================
   IMClaw Official Website
   Minimal · Tech · Futuristic
   ======================================== */

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

:root {
  --bg: #f7f7f8;
  --bg-section: #f0f0f2;
  --surface: #ffffff;
  --surface-hover: #fafafa;
  --border: #e8e8ec;
  --border-light: #d8d8dd;
  --text-primary: #111111;
  --text-secondary: #6b6b76;
  --text-tertiary: #9b9ba4;
  --accent: #111111;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --font: 'MiSans Normal', 'MiSans', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul { list-style: none; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  height: 48px; padding: 0 28px; border-radius: var(--radius-md);
  font-family: var(--font); font-size: 15px; font-weight: 600;
  transition: all var(--transition); cursor: pointer; border: none;
  letter-spacing: 0.01em;
}
.btn-primary {
  background: var(--accent); color: #fff;
}
.btn-primary:hover { background: #333; transform: translateY(-1px); }
.btn-ghost {
  background: transparent; color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-ghost:hover { border-color: var(--text-secondary); color: var(--text-primary); }
.btn-lg { height: 56px; padding: 0 36px; font-size: 16px; border-radius: var(--radius-lg); }

/* --- Nav --- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: 64px;
  background: rgba(247, 247, 248, 0.7);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}
.nav.scrolled { border-bottom-color: var(--border); background: rgba(247, 247, 248, 0.9); }
.nav-inner {
  max-width: 1120px; margin: 0 auto; padding: 0 24px;
  height: 100%; display: flex; align-items: center;
}
.nav-brand {
  display: flex; align-items: center; gap: 10px; flex-shrink: 0;
}
.nav-logo { width: 28px; height: 28px; object-fit: contain; }
.nav-name { font-size: 18px; font-weight: 700; letter-spacing: -0.3px; }
.nav-links {
  display: flex; gap: 32px; margin-left: auto; margin-right: 32px;
}
.nav-links a {
  font-size: 14px; color: var(--text-secondary); font-weight: 500;
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--text-primary); }
.nav-cta {
  display: inline-flex; align-items: center; height: 36px; padding: 0 18px;
  border-radius: var(--radius-sm); background: var(--accent); color: #fff;
  font-size: 13px; font-weight: 600; transition: all var(--transition);
}
.nav-cta:hover { background: #333; }
.nav-burger {
  display: none; background: none; border: none; cursor: pointer;
  width: 32px; height: 32px; flex-direction: column; align-items: center;
  justify-content: center; gap: 5px; margin-left: auto;
}
.nav-burger span {
  display: block; width: 20px; height: 1.5px; background: var(--text-primary);
  transition: all 0.3s ease;
}

/* --- Mobile Menu --- */
.mobile-menu {
  position: fixed; inset: 0; z-index: 99; background: rgba(247, 247, 248, 0.95);
  backdrop-filter: blur(20px);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 24px; opacity: 0; pointer-events: none; transition: opacity 0.3s ease;
}
.mobile-menu.open { opacity: 1; pointer-events: auto; }
.mobile-menu a {
  font-size: 20px; font-weight: 500; color: var(--text-secondary);
  transition: color var(--transition);
}
.mobile-menu a:hover { color: var(--text-primary); }
.mobile-cta {
  margin-top: 16px; padding: 12px 32px; border-radius: var(--radius-md);
  background: var(--accent); color: #fff !important; font-weight: 600;
}

/* --- Hero --- */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  text-align: center; overflow: hidden;
  padding: 120px 24px 80px;
}
.hero::before {
  content: '';
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(200, 210, 230, 0.3) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 80%, rgba(220, 215, 230, 0.2) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(240, 240, 255, 0.15) 0%, transparent 60%);
  pointer-events: none;
}
#meshCanvas {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
}

/* HUD decorations */
.hero-hud {
  position: absolute; z-index: 2; pointer-events: none;
}
.hero-hud-tl { top: 28px; left: 28px; }
.hero-hud-tr { top: 28px; right: 28px; text-align: right; }
.hero-hud-bl { bottom: 28px; left: 28px; }
.hero-hud-br { bottom: 28px; right: 28px; text-align: right; }
.hud-label {
  font-size: 10px; font-weight: 600; letter-spacing: 2px;
  text-transform: uppercase; color: var(--text-primary); opacity: 0.35;
  font-family: 'SF Mono', 'Fira Code', monospace;
  display: flex; align-items: center; gap: 6px;
  margin-bottom: 4px;
}
.hud-dot {
  display: inline-block; width: 5px; height: 5px; border-radius: 50%;
  background: var(--text-primary); animation: hudPulse 2s ease-in-out infinite;
}
.hud-sub {
  font-size: 10px; letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--text-tertiary); opacity: 0.5;
  font-family: 'SF Mono', 'Fira Code', monospace;
}
@keyframes hudPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}
.hero-content {
  position: relative; z-index: 1; max-width: 720px;
  text-shadow: 0 0 40px rgba(247,247,248,1), 0 0 80px rgba(247,247,248,0.8);
}
.hero-title {
  font-size: clamp(40px, 7vw, 72px); font-weight: 900;
  line-height: 1.1; letter-spacing: 2px; margin-bottom: 20px;
  color: var(--text-primary); word-spacing: 8px;
}
.hero-title em {
  font-style: italic; font-weight: 300;
  color: var(--text-tertiary);
  -webkit-text-fill-color: var(--text-tertiary);
  letter-spacing: 0;
}
.hero-title em:last-child {
  font-style: normal; font-weight: 900;
  color: var(--text-primary);
  -webkit-text-fill-color: var(--text-primary);
  letter-spacing: 2px;
}
.hero-subtitle {
  font-size: 17px; color: var(--text-secondary); line-height: 1.7;
  margin-bottom: 36px; max-width: 520px; margin-left: auto; margin-right: auto;
}
.hero-subtitle .highlight {
  color: var(--text-primary); font-weight: 700;
}
.hero-actions { display: flex; gap: 12px; justify-content: center; }

/* --- Section --- */
.section { padding: 120px 0; }
.section-dark { background: var(--bg-section); }
.section-header { text-align: center; margin-bottom: 64px; }
.section-label {
  display: inline-block; font-size: 12px; font-weight: 600; letter-spacing: 2px;
  text-transform: uppercase; color: var(--text-tertiary); margin-bottom: 12px;
}
.section-title {
  font-size: clamp(28px, 4vw, 40px); font-weight: 700;
  letter-spacing: -1px; margin-bottom: 12px;
}
.section-desc { font-size: 16px; color: var(--text-secondary); max-width: 480px; margin: 0 auto; }

/* --- Feature Alternating --- */
.feat-alt {
  display: flex; flex-direction: column; gap: 0;
}
.feat-item {
  display: grid; grid-template-columns: 1fr 1fr; gap: 64px;
  align-items: center; padding: 64px 0;
  border-bottom: 1px solid var(--border);
}
.feat-item:first-child { border-top: 1px solid var(--border); }
.feat-reverse { direction: rtl; }
.feat-reverse > * { direction: ltr; }
.feat-content {}
.feat-num {
  display: inline-block; font-size: 11px; font-weight: 600;
  color: var(--text-tertiary); letter-spacing: 1.5px;
  margin-bottom: 14px; text-transform: uppercase;
}
.feat-content h3 {
  font-size: 24px; font-weight: 700; letter-spacing: -0.5px;
  margin-bottom: 12px; color: var(--text-primary); line-height: 1.3;
}
.feat-content p {
  font-size: 15px; color: var(--text-secondary); line-height: 1.7;
}
.feat-visual {
  display: flex; align-items: center; justify-content: center;
}
.feat-window {
  position: relative; width: 100%; aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg); overflow: hidden;
  border: 1px solid rgba(0, 0, 0, 0.08);
  background: var(--surface);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 4px 12px rgba(0, 0, 0, 0.03);
  transition: box-shadow var(--transition), transform var(--transition);
}
.feat-window img,
.feat-window video {
  width: 100%; height: 100%; object-fit: cover; display: block;
}
.feat-item:hover .feat-window {
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(0, 0, 0, 0.05);
  transform: translateY(-2px);
}

/* --- Steps --- */
.steps {
  display: flex; align-items: flex-start; gap: 0;
  max-width: 900px; margin: 0 auto;
}
.step {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  text-align: center; padding: 0 24px;
}
.step-visual {
  width: 120px; height: 100px; margin-bottom: 20px;
  color: var(--text-tertiary);
  transition: color 0.3s;
}
.step-visual svg { width: 100%; height: 100%; }
.step:hover .step-visual { color: var(--text-primary); }
.step-num {
  font-size: 48px; font-weight: 800; letter-spacing: -2px;
  background: linear-gradient(180deg, var(--text-primary) 0%, var(--text-tertiary) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; margin-bottom: 16px;
}
.step-body h3 { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
.step-body p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }
.step-line {
  width: 1px; min-height: 60px; background: var(--border);
  align-self: center; flex-shrink: 0;
  display: none;
}

/* --- Showcase --- */
.showcase-grid {
  display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; align-items: center;
}
.showcase-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
}
.showcase-card-header {
  display: flex; gap: 6px; padding: 14px 18px; border-bottom: 1px solid var(--border);
}
.showcase-dot {
  width: 10px; height: 10px; border-radius: 50%; background: var(--border-light);
}
.showcase-card-body { padding: 24px; }
.showcase-chat { display: flex; flex-direction: column; gap: 14px; }
.showcase-msg {
  padding: 12px 16px; border-radius: var(--radius-md); font-size: 13px;
  line-height: 1.6; max-width: 85%;
}
.showcase-msg-self {
  background: var(--accent); color: #fff;
  align-self: flex-end; border-radius: var(--radius-md) var(--radius-md) 4px var(--radius-md);
}
.showcase-msg-claw {
  background: var(--bg); border: 1px solid var(--border);
  align-self: flex-start; border-radius: var(--radius-md) var(--radius-md) var(--radius-md) 4px;
}
.showcase-claw-badge {
  display: inline-flex; align-items: center; gap: 6px;
  margin-bottom: 6px; font-size: 11px; font-weight: 600; color: var(--text-tertiary);
}
.showcase-claw-badge img { width: 16px; height: 16px; border-radius: 50%; object-fit: cover; }
.showcase-msg-system {
  align-self: center; font-size: 12px; color: var(--text-tertiary);
  background: none; padding: 4px 0;
}
.showcase-features { display: flex; flex-direction: column; gap: 24px; }
.showcase-feat {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 20px; border-radius: var(--radius-md);
  transition: background var(--transition);
}
.showcase-feat:hover { background: var(--surface); }
.showcase-feat-icon { font-size: 24px; flex-shrink: 0; padding-top: 2px; }
.showcase-feat h4 { font-size: 15px; font-weight: 600; margin-bottom: 4px; }
.showcase-feat p { font-size: 13px; color: var(--text-secondary); line-height: 1.5; }

/* --- Security --- */
.security-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
  margin-bottom: 48px;
}
.security-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px 28px;
  transition: all var(--transition);
}
.security-card:hover {
  border-color: var(--border-light); transform: translateY(-2px);
}
.security-icon {
  width: 44px; height: 44px; display: flex; align-items: center; justify-content: center;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius-sm); margin-bottom: 20px;
}
.security-icon svg { width: 22px; height: 22px; color: var(--text-secondary); }
.security-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 14px; }
.security-card li {
  font-size: 13px; color: var(--text-secondary); line-height: 1.6;
  padding: 4px 0; padding-left: 14px; position: relative;
}
.security-card li::before {
  content: ''; position: absolute; left: 0; top: 11px;
  width: 5px; height: 5px; border-radius: 50%; background: var(--border-light);
}
.security-checkpoints {
  text-align: center;
  padding: 32px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.security-checkpoints h4 {
  font-size: 14px; font-weight: 600; color: var(--text-secondary); margin-bottom: 16px;
}
.checkpoint-tags { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.checkpoint-tags span {
  padding: 8px 16px; border-radius: 100px;
  border: 1px solid var(--border); font-size: 13px; font-weight: 500;
  color: var(--text-secondary); transition: all var(--transition);
}
.checkpoint-tags span:hover { border-color: var(--text-tertiary); color: var(--text-primary); }

/* --- Protocol --- */
.protocol-section {
  position: relative; overflow: hidden;
}
.protocol-grid-bg {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0,0,0,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, black, transparent);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, black, transparent);
  pointer-events: none;
}
.protocol-section .container { position: relative; z-index: 1; }
.protocol-diagram {
  display: flex; align-items: center; justify-content: center;
  gap: 16px; flex-wrap: wrap;
  padding: 48px 24px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.protocol-node {
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  padding: 24px; border: 1px solid var(--border); border-radius: var(--radius-md);
  background: var(--bg); min-width: 100px;
}
.protocol-node-icon { font-size: 28px; }
.protocol-node img { width: 28px; height: 28px; }
.protocol-node span { font-size: 12px; font-weight: 600; color: var(--text-secondary); }
.protocol-arrow {
  font-size: 20px; color: var(--text-tertiary); font-weight: 300;
}
.protocol-channels {
  display: flex; flex-direction: column; gap: 6px;
}
.protocol-channel {
  padding: 10px 20px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  font-size: 13px; font-weight: 500; color: var(--text-secondary);
  background: var(--bg); transition: all var(--transition);
}
.protocol-channel:hover { border-color: var(--text-tertiary); color: var(--text-primary); }

/* --- CTA --- */
.section-cta {
  background: var(--bg-section);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.cta-content {
  text-align: center; max-width: 760px; margin: 0 auto;
}
.cta-content h2 {
  font-size: clamp(24px, 3vw, 32px); font-weight: 700;
  letter-spacing: -0.5px; margin-bottom: 8px;
}
.cta-subtitle {
  font-size: 15px; color: var(--text-secondary); margin-bottom: 0;
}
.cta-form {
  display: flex; gap: 10px; justify-content: center;
  max-width: 420px; margin: 28px auto 0;
}
.cta-email {
  flex: 1; min-width: 0; height: 44px; padding: 0 14px; border-radius: var(--radius-md);
  border: 1px solid var(--border); background: var(--surface);
  font-size: 14px; font-family: var(--font);
  outline: none; transition: border-color var(--transition), box-shadow var(--transition);
}
.cta-email:focus { border-color: var(--text-secondary); }
.cta-action-btn {
  height: 44px; padding: 0 20px; font-size: 14px; white-space: nowrap; flex-shrink: 0;
}
.cta-action-btn:disabled { opacity: 0.6; cursor: not-allowed; }
.cta-action-btn.success {
  background: #16a34a; pointer-events: none;
}
.cta-hint {
  font-size: 13px;
  color: var(--text-secondary);
  text-align: center;
  margin-top: 12px;
  min-height: 20px;
}
.cta-hint.info { color: var(--text-secondary); }
.cta-hint.error { color: #dc2626; }
.cta-hint.success { color: #16a34a; }
.cta-link { margin-top: 8px; }
.cta-link a {
  font-size: 13px; color: var(--text-primary); font-weight: 600;
  text-decoration: underline; text-underline-offset: 3px;
}
.cta-link span {
  display: block; font-size: 12px; color: var(--text-tertiary); margin-top: 4px;
}

/* --- Live Network --- */
.live-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 64px; max-width: 720px; margin: 0 auto;
}
.live-col {
  display: flex; flex-direction: column;
}
.live-col-header {
  display: flex; align-items: center; gap: 8px;
  font-size: 10px; font-weight: 700; letter-spacing: 2px;
  text-transform: uppercase; color: var(--text-primary); opacity: 0.4;
  font-family: 'SF Mono', 'Fira Code', monospace;
  margin-bottom: 16px;
}
.live-col-header svg { flex-shrink: 0; }
.live-metric {
  display: flex; align-items: baseline; gap: 10px; margin-bottom: 12px;
}
.live-num {
  font-size: 48px; font-weight: 300; letter-spacing: -2px;
  color: var(--text-primary); font-variant-numeric: tabular-nums;
  transition: color 0.3s;
}
.live-unit {
  font-size: 10px; font-weight: 600; letter-spacing: 2px;
  color: var(--text-tertiary); font-family: 'SF Mono', 'Fira Code', monospace;
}
.live-pulse {
  display: inline-block; width: 7px; height: 7px; border-radius: 50%;
  background: var(--text-primary); opacity: 0.5;
  animation: hudPulse 2s ease-in-out infinite;
}

/* Topo canvas */
.live-topo-wrap {
  position: relative; width: 100%; height: 80px; overflow: hidden;
  margin-top: auto; opacity: 0.8;
}
.live-topo-wrap canvas {
  position: absolute; inset: 0;
}
.live-topo-label {
  position: absolute; bottom: 2px; left: 0;
  font-size: 8px; font-family: 'SF Mono', 'Fira Code', monospace;
  letter-spacing: 2px; text-transform: uppercase;
  color: var(--text-tertiary); background: rgba(247,247,248,0.8);
  padding: 1px 4px; backdrop-filter: blur(4px);
}

/* Event stream */
.live-events {
  display: flex; flex-direction: column; gap: 16px;
  position: relative; min-height: 240px;
}
.live-event {
  font-size: 10px; font-family: 'SF Mono', 'Fira Code', monospace;
  line-height: 1.7; color: var(--text-secondary); letter-spacing: 0.5px;
}
.live-event-time { color: var(--text-tertiary); margin-right: 4px; }
.live-event-new { color: var(--text-primary); font-weight: 700; }
.live-events-fade {
  position: absolute; bottom: 0; left: 0; right: 0; height: 80px;
  background: linear-gradient(to top, var(--bg), transparent);
  pointer-events: none;
}
.live-col:nth-child(3) { position: relative; }

@keyframes liveFadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- Footer --- */
.footer { padding: 48px 0 0; border-top: 1px solid var(--border); }
.footer-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding-bottom: 32px;
}
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-logo { width: 24px; height: 24px; opacity: 0.6; }
.footer-brand span { font-size: 16px; font-weight: 700; }
.footer-links { display: flex; gap: 24px; }
.footer-links a { font-size: 13px; color: var(--text-tertiary); transition: color var(--transition); }
.footer-links a:hover { color: var(--text-secondary); }
.footer-slogan {
  font-size: 12px; color: var(--text-tertiary); letter-spacing: 0.5px;
}
.footer-bottom {
  border-top: 1px solid var(--border); padding: 20px 0;
  font-size: 12px; color: var(--text-tertiary); text-align: center;
}

/* --- Reveal Animation --- */
.reveal {
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* --- Responsive --- */
@media (max-width: 768px) {
  .hero-hud { display: none; }
  .nav-links, .nav-cta { display: none; }
  .nav-burger { display: flex; }

  .feat-item { grid-template-columns: 1fr; gap: 32px; padding: 48px 0; }
  .feat-reverse { direction: ltr; }
  .feat-window { max-width: 100%; }
  .feat-content h3 { font-size: 20px; }
  .security-grid { grid-template-columns: 1fr; }
  .showcase-grid { grid-template-columns: 1fr; }
  .live-grid { grid-template-columns: 1fr; gap: 48px; }

  .steps { flex-direction: column; gap: 32px; }
  .step { padding: 0; }

  .protocol-diagram { flex-direction: column; }
  .protocol-arrow { transform: rotate(90deg); }

  .cta-form { max-width: 100%; }

  .footer-inner { flex-direction: column; gap: 20px; text-align: center; }
  .footer-links { justify-content: center; }

  .section { padding: 80px 0; }
  .hero { padding: 100px 20px 60px; }
}

@media (max-width: 480px) {
  .hero-title { letter-spacing: -1px; }
  .hero-actions { flex-direction: column; align-items: center; }
  .checkpoint-tags { gap: 6px; }
  .checkpoint-tags span { font-size: 12px; padding: 6px 12px; }
}