:root {
  --ink: #0F1218;
  --cyan: #00E5FF;
  --cyan-50: #E8FCFF;
  --white: #fff;
  --gray-500: #5B6573;
  --gray-100: #F2F4F7;
  --gray-800: #1a1d24;
  --gray-900: #14171e;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, system-ui, sans-serif;
  color: var(--ink);
  background: var(--white);
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 80px 24px;
}

/* Navigation */
.nav {
  background: var(--ink);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 24px;
}

.nav-logo {
  font-size: 20px;
  font-weight: 800;
  color: var(--cyan);
}

.nav-links {
  display: flex;
  gap: 24px;
}

.nav-links a {
  color: var(--gray-500);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--cyan);
}

/* Hero */
.hero {
  background: var(--ink);
  color: var(--white);
  padding: 100px 0;
}

.hero h1 {
  font-size: 64px;
  font-weight: 800;
  line-height: 1.05;
  margin-bottom: 24px;
  letter-spacing: -1.5px;
}

.hero-sub {
  font-size: 19px;
  color: #9aa3b2;
  max-width: 640px;
  margin-bottom: 36px;
  line-height: 1.6;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 14px 28px;
  border-radius: 8px;
  font-weight: 700;
  text-decoration: none;
  border: none;
  cursor: pointer;
  font-size: 16px;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--cyan);
  color: var(--ink);
}

.btn-primary:hover {
  background: #1be5ff;
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,0.25);
}

.btn-secondary:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn-regenerate {
  margin-top: 16px;
  font-size: 14px;
  padding: 10px 20px;
  align-self: flex-start;
}

.gen-output .btn-regenerate {
  align-self: flex-start;
}

/* Sections */
.section {
  padding: 80px 0;
}

.section-dark {
  background: var(--ink);
  color: var(--white);
}

.section-dark .section-desc {
  color: #9aa3b2;
}

.section h2 {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 18px;
  color: var(--gray-500);
  max-width: 600px;
  margin-bottom: 48px;
}

/* Architecture */
.arch-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.arch-card {
  background: var(--gray-100);
  border-radius: 16px;
  overflow: hidden;
}

.section-dark .arch-card {
  background: var(--gray-800);
  color: var(--white);
}

.arch-card-header {
  background: var(--ink);
  color: var(--cyan);
  padding: 12px 20px;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.section-dark .arch-card-header {
  background: var(--gray-900);
}

.arch-card-body {
  padding: 20px;
  font-size: 14px;
  line-height: 1.7;
}

.arch-card-body code {
  display: block;
  background: rgba(0,0,0,0.06);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 13px;
  margin: 4px 0;
}

.section-dark .arch-card-body code {
  background: rgba(255,255,255,0.06);
}

.arch-sub {
  font-weight: 700;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  color: var(--gray-500);
}

.arch-desc {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--gray-500);
}

.params-bar {
  display: flex;
  gap: 40px;
  padding: 20px 24px;
  background: var(--gray-100);
  border-radius: 12px;
  font-size: 14px;
}

.section-dark .params-bar {
  background: var(--gray-800);
}

.params-bar strong {
  color: var(--cyan);
}

/* Generator */
.generator-box {
  background: var(--gray-800);
  border-radius: 16px;
  padding: 32px;
  max-width: 700px;
}

.gen-row {
  margin-bottom: 20px;
}

.gen-input {
  width: 100%;
  padding: 14px 18px;
  border-radius: 8px;
  border: 2px solid rgba(255,255,255,0.12);
  background: var(--gray-900);
  color: var(--white);
  font-size: 17px;
  outline: none;
  transition: border-color 0.2s;
}

.gen-input:focus {
  border-color: var(--cyan);
}

.gen-input::placeholder {
  color: var(--gray-500);
}

.gen-controls {
  display: flex;
  gap: 32px;
  margin-bottom: 20px;
}

.gen-slider-group {
  flex: 1;
}

.gen-slider-group label {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  color: #9aa3b2;
  margin-bottom: 8px;
}

.gen-slider-group input[type="range"] {
  width: 100%;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: rgba(255,255,255,0.15);
  border-radius: 2px;
  outline: none;
}

.gen-slider-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--cyan);
  cursor: pointer;
}

.btn-gen {
  margin-right: 12px;
}

.status-msg {
  font-size: 14px;
  color: #9aa3b2;
  margin-bottom: 12px;
  min-height: 20px;
}

.status-msg.error {
  color: #ff6b6b;
}

.gen-output {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.gen-output-item {
  background: var(--gray-900);
  border-radius: 8px;
  padding: 14px 18px;
  font-size: 15px;
  color: var(--white);
  line-height: 1.5;
  animation: fadeIn 0.3s ease;
}

.gen-output-item .gen-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  color: var(--cyan);
  background: rgba(0,229,255,0.1);
  padding: 2px 8px;
  border-radius: 4px;
  margin-right: 8px;
}

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

/* Examples */
.ex-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 28px;
  background: var(--gray-100);
  border-radius: 10px;
  padding: 4px;
  display: inline-flex;
}

.ex-tab {
  padding: 10px 20px;
  border: none;
  background: transparent;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--gray-500);
}

.ex-tab.active {
  background: var(--white);
  color: var(--ink);
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.ex-tab:hover:not(.active) {
  color: var(--ink);
}

.ex-content {
  display: none;
  flex-direction: column;
  gap: 12px;
}

.ex-content.active {
  display: flex;
}

.ex-item {
  background: var(--gray-100);
  border-radius: 10px;
  padding: 16px 20px;
  font-size: 16px;
  line-height: 1.5;
}

.ex-item mark {
  background: var(--cyan-50);
  color: var(--ink);
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
}

.badge {
  display: inline-block;
  background: var(--ink);
  color: var(--cyan);
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  margin-right: 8px;
}

/* Code */
.code-block {
  background: var(--gray-900);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 20px;
  border: 1px solid rgba(255,255,255,0.06);
}

.code-block:last-child {
  margin-bottom: 0;
}

.code-header {
  padding: 10px 20px;
  font-size: 12px;
  font-weight: 700;
  color: var(--gray-500);
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.code-block pre {
  padding: 20px;
  font-size: 14px;
  line-height: 1.7;
  color: #e2e8f0;
  overflow-x: auto;
  font-family: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas, monospace;
}

.code-block .kw { color: #ff79c6; }
.code-block .fn { color: #50fa7b; }
.code-block .str { color: #f1fa8c; }
.code-block .num { color: #bd93f9; }

/* Footer */
.footer {
  background: var(--ink);
  color: var(--gray-500);
  text-align: center;
  padding: 40px 0;
  border-top: 1px solid rgba(255,255,255,0.06);
}

.footer p {
  font-size: 15px;
}

.footer-small {
  font-size: 13px;
  margin-top: 4px;
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 48px 20px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero-sub {
    font-size: 17px;
  }

  .section h2 {
    font-size: 28px;
  }

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

  .params-bar {
    flex-direction: column;
    gap: 8px;
  }

  .gen-controls {
    flex-direction: column;
    gap: 16px;
  }

  .nav-links {
    display: none;
  }

  .ex-tabs {
    flex-direction: column;
    width: 100%;
  }
}