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

:root {
  --bg: #0e0e0e;
  --bg-alt: #141414;
  --surface: #1a1a1a;
  --border: #2a2a2a;
  --border-light: #3a3a3a;
  --accent: #e8a020;
  --accent-hover: #f0b040;
  --text: #e8e8e8;
  --text-dim: #999;
  --text-muted: #666;
  --steel: #bbb;
  --radius: 8px;
  --radius-lg: 12px;
  --transition: 0.3s ease;
  --font: 'Space Grotesk', system-ui, sans-serif;
}

html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.accent { color: var(--accent); }

/* === Header === */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(14,14,14,0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.nav-container {
  max-width: 1120px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.logo { font-size: 1.25rem; font-weight: 700; letter-spacing: 0.08em; }
.logo-accent { color: var(--accent); margin-left: 2px; }
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a {
  font-size: 0.875rem; font-weight: 500; color: var(--text-dim);
  transition: color var(--transition); letter-spacing: 0.02em;
}
.nav-links a:hover { color: var(--text); }
.nav-cta {
  background: var(--accent) !important; color: #000 !important;
  padding: 8px 20px; border-radius: 6px; font-weight: 600;
  transition: background var(--transition) !important;
}
.nav-cta:hover { background: var(--accent-hover) !important; }
.mobile-toggle { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
.mobile-toggle span {
  display: block; width: 24px; height: 2px; background: var(--text);
  margin: 5px 0; transition: var(--transition);
}

/* === Buttons === */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 14px 28px; border-radius: 6px; font-family: var(--font);
  font-size: 0.9375rem; font-weight: 600; cursor: pointer;
  transition: all var(--transition); border: none; letter-spacing: 0.02em;
}
.btn-primary { background: var(--accent); color: #000; }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); }
.btn-secondary {
  background: transparent; color: var(--text); border: 1px solid var(--border-light);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn-full { width: 100%; }

/* === Hero === */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  padding: 100px 24px 60px;
  max-width: 1120px; margin: 0 auto;
  gap: 48px;
}
.hero-content { flex: 1; min-width: 0; }
.hero-tag {
  font-size: 0.8125rem; font-weight: 600; color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.12em; margin-bottom: 16px;
}
.hero-title {
  font-size: clamp(2.25rem, 5vw, 3.5rem); font-weight: 700;
  line-height: 1.1; margin-bottom: 20px; letter-spacing: -0.02em;
}
.hero-sub {
  font-size: 1.0625rem; color: var(--steel); line-height: 1.7;
  max-width: 520px; margin-bottom: 32px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-visual { flex: 1; min-width: 0; display: flex; flex-direction: column; align-items: center; }
.truck-svg { width: 100%; max-width: 560px; }
.hero-mode-btns { display: flex; gap: 8px; margin-top: 20px; }
.mode-btn {
  font-family: var(--font); font-size: 0.8125rem; font-weight: 600;
  padding: 8px 20px; border-radius: 6px; cursor: pointer;
  background: var(--surface); color: var(--text-dim);
  border: 1px solid var(--border); transition: all var(--transition);
  letter-spacing: 0.04em; text-transform: uppercase;
}
.mode-btn:hover { border-color: var(--accent); color: var(--text); }
.mode-btn.active {
  background: var(--accent); color: #000; border-color: var(--accent);
}

/* === Sections === */
.section { padding: 100px 0; }
.section-dark { background: var(--bg-alt); }
.section-tag {
  font-size: 0.8125rem; font-weight: 600; color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.12em; margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem); font-weight: 700;
  line-height: 1.15; margin-bottom: 16px; letter-spacing: -0.01em;
}
.section-sub {
  font-size: 1.0625rem; color: var(--steel); max-width: 600px;
  margin-bottom: 48px; line-height: 1.7;
}

/* === Problem === */
.problem-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px; margin-top: 48px;
}
.problem-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px;
  transition: border-color var(--transition);
}
.problem-card:hover { border-color: var(--border-light); }
.problem-icon { margin-bottom: 20px; }
.problem-card h3 { font-size: 1.125rem; font-weight: 600; margin-bottom: 10px; }
.problem-card p { font-size: 0.9375rem; color: var(--steel); line-height: 1.6; }
.problem-summary {
  margin-top: 40px; font-size: 1.0625rem; color: var(--text-dim);
  max-width: 680px; line-height: 1.7;
}

/* === Solution === */
.solution-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px; margin-top: 48px;
}
.solution-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 36px;
  position: relative; transition: border-color var(--transition);
}
.solution-card:hover { border-color: var(--accent); }
.solution-num {
  font-size: 2.5rem; font-weight: 700; color: var(--accent);
  opacity: 0.3; line-height: 1; margin-bottom: 16px; display: block;
}
.solution-card h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: 10px; }
.solution-card p { font-size: 0.9375rem; color: var(--steel); line-height: 1.6; }

/* === Configurations === */
.config-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px; margin-top: 48px;
}
.config-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}
.config-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.config-visual {
  background: var(--bg); padding: 24px; display: flex;
  align-items: center; justify-content: center;
  border-bottom: 1px solid var(--border); min-height: 180px;
}
.config-visual svg { width: 100%; max-width: 280px; }
.config-label {
  display: inline-block; margin: 20px 24px 8px;
  font-size: 0.75rem; font-weight: 600; color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.1em;
  background: rgba(232,160,32,0.1); padding: 4px 10px;
  border-radius: 4px;
}
.config-card h3 { font-size: 1.125rem; font-weight: 600; margin: 0 24px 8px; }
.config-card p { font-size: 0.9375rem; color: var(--steel); margin: 0 24px 16px; line-height: 1.6; }
.config-features {
  margin: 0 24px 24px; display: flex; flex-direction: column; gap: 6px;
}
.config-features li {
  font-size: 0.8125rem; color: var(--text-dim); padding-left: 16px;
  position: relative;
}
.config-features li::before {
  content: ''; position: absolute; left: 0; top: 7px;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); opacity: 0.6;
}

/* === How It Works === */
.steps-grid {
  display: flex; align-items: flex-start; justify-content: center;
  gap: 16px; margin-top: 48px; flex-wrap: wrap;
}
.step-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px; text-align: center;
  flex: 1; min-width: 200px; max-width: 280px;
  transition: border-color var(--transition);
}
.step-card:hover { border-color: var(--accent); }
.step-icon { margin-bottom: 16px; }
.step-num {
  font-size: 0.75rem; font-weight: 600; color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 8px;
  display: block;
}
.step-card h3 { font-size: 1.125rem; font-weight: 600; margin-bottom: 8px; }
.step-card p { font-size: 0.875rem; color: var(--steel); line-height: 1.6; }
.step-divider {
  display: flex; align-items: center; padding-top: 52px;
}

/* === Timeline === */
.timeline { max-width: 600px; margin: 48px auto 0; position: relative; }
.timeline::before {
  content: ''; position: absolute; left: 15px; top: 8px; bottom: 8px;
  width: 2px; background: var(--border);
}
.timeline-item { display: flex; gap: 24px; padding-bottom: 36px; position: relative; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-marker {
  width: 32px; height: 32px; border-radius: 50%; flex-shrink: 0;
  border: 2px solid var(--border); background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  position: relative; z-index: 1;
}
.timeline-item.done .timeline-marker {
  border-color: var(--accent); background: var(--accent);
}
.timeline-item.done .timeline-marker::after {
  content: '✓'; color: #000; font-size: 0.75rem; font-weight: 700;
}
.timeline-item.active .timeline-marker {
  border-color: var(--accent);
}
.timeline-item.active .timeline-marker::after {
  content: ''; width: 10px; height: 10px; border-radius: 50%;
  background: var(--accent); animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}
.timeline-content h3 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.timeline-content p { font-size: 0.875rem; color: var(--text-dim); }

/* === Media === */
.media-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 20px; margin-top: 48px;
}
.media-card {
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden; transition: border-color var(--transition);
}
.media-card:hover { border-color: var(--border-light); }
.media-placeholder {
  background: var(--surface); aspect-ratio: 4/3;
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 12px;
}
.media-placeholder span {
  font-size: 0.8125rem; color: var(--text-muted); font-weight: 500;
}

/* === Inquire === */
.inquire-container {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 64px; align-items: start;
}
.inquire-text p:last-of-type {
  color: var(--steel); font-size: 1rem; line-height: 1.7; margin-top: 16px;
}
.inquire-form {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 36px;
}
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block; font-size: 0.8125rem; font-weight: 600;
  margin-bottom: 6px; color: var(--steel);
}
.required { color: var(--accent); }
.optional { color: var(--text-muted); font-weight: 400; }
.form-group input, .form-group textarea {
  width: 100%; padding: 12px 16px; border-radius: 6px;
  border: 1px solid var(--border); background: var(--bg);
  color: var(--text); font-family: var(--font); font-size: 0.9375rem;
  transition: border-color var(--transition);
}
.form-group input:focus, .form-group textarea:focus {
  outline: none; border-color: var(--accent);
}
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--text-muted); }
.form-note { font-size: 0.8125rem; color: var(--text-muted); margin-top: 12px; text-align: center; }
.form-fallback-link { color: var(--accent); text-decoration: underline; }
.form-fallback-link:hover { color: var(--accent-hover); }
.form-privacy {
  font-size: 0.8125rem; color: var(--text-muted); margin-top: 12px;
  line-height: 1.6; font-style: italic;
}
.form-success {
  text-align: center; padding: 32px 24px;
}
.form-success h3 {
  font-size: 1.25rem; font-weight: 600; color: var(--accent); margin-bottom: 8px;
}
.form-success p { font-size: 0.9375rem; color: var(--steel); }

/* === Footer === */
.site-footer {
  border-top: 1px solid var(--border); padding: 40px 0;
}
.footer-inner {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 24px;
}
.footer-brand p { font-size: 0.8125rem; color: var(--text-muted); margin-top: 4px; }
.footer-links { display: flex; gap: 24px; }
.footer-links a { font-size: 0.8125rem; color: var(--text-dim); transition: color var(--transition); }
.footer-links a:hover { color: var(--text); }
.footer-patent {
  font-size: 0.75rem; color: var(--text-muted); letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

/* === Mobile === */
@media (max-width: 900px) {
  .hero { flex-direction: column; min-height: auto; padding-top: 100px; }
  .hero-visual { width: 100%; }
  .problem-grid, .solution-grid, .config-grid { grid-template-columns: 1fr; }
  .media-grid { grid-template-columns: repeat(2, 1fr); }
  .inquire-container { grid-template-columns: 1fr; gap: 40px; }
  .steps-grid { flex-direction: column; align-items: center; }
  .step-divider { transform: rotate(90deg); padding-top: 0; }
}
@media (max-width: 640px) {
  .nav-links {
    display: none; flex-direction: column; position: absolute;
    top: 64px; left: 0; right: 0; background: rgba(14,14,14,0.97);
    backdrop-filter: blur(16px); padding: 24px;
    border-bottom: 1px solid var(--border); gap: 20px;
  }
  .nav-links.open { display: flex; }
  .mobile-toggle { display: block; }
  .media-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 2rem; }
  .section { padding: 64px 0; }
}