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

body {
  min-height: 100vh;
  background: linear-gradient(135deg, #111318 0%, #1a1d26 50%, #22252f 100%);
  background-attachment: fixed;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  color: #fff;
  line-height: 1.6;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: rgba(17, 19, 24, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  z-index: 100;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: #fff;
}

.header-logo img {
  width: auto;
  height: 32px;
}

.header-logo span {
  font-size: 1.2rem;
  font-weight: 700;
  background: linear-gradient(90deg, #e5a54b, #d4943c);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-nav {
  display: flex;
  gap: 2rem;
}

.header-nav a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.header-nav a:hover,
.header-nav a.active {
  color: #e5a54b;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  flex-direction: column;
  gap: 5px;
}

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  transition: transform 0.2s;
}

/* Main content */
main {
  padding-top: 70px;
  min-height: calc(100vh - 200px);
}

/* Hero */
.hero {
  min-height: calc(100vh - 70px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  background: linear-gradient(90deg, #e5a54b, #c9853a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .subtitle {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 2rem;
  font-weight: 400;
}

.hero .mission {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 2.5rem;
  max-width: 680px;
  line-height: 1.8;
}

.version-badge {
  display: inline-block;
  padding: 0.35rem 1rem;
  background: rgba(229, 165, 75, 0.12);
  border: 1px solid rgba(229, 165, 75, 0.3);
  border-radius: 50px;
  font-size: 0.85rem;
  color: #e5a54b;
  font-weight: 500;
  margin-bottom: 2rem;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.btn-primary {
  display: inline-block;
  padding: 0.9rem 2rem;
  background: linear-gradient(135deg, #e5a54b, #c9853a);
  color: #111318;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(229, 165, 75, 0.25);
}

.btn-secondary {
  display: inline-block;
  padding: 0.9rem 2rem;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  transition: background 0.2s;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
}

/* Sections */
.section {
  padding: 5rem 2rem;
}

.section-alt {
  background: rgba(0, 0, 0, 0.2);
}

.container {
  max-width: 900px;
  margin: 0 auto;
}

.container-wide {
  max-width: 1100px;
  margin: 0 auto;
}

h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  color: #e5a54b;
}

h2.center {
  text-align: center;
}

.section-intro {
  text-align: center;
  color: rgba(255, 255, 255, 0.75);
  font-size: 1.05rem;
  margin-bottom: 2.5rem;
  max-width: 650px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

/* Principle cards */
.principles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.principle-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  padding: 1.75rem;
  transition: border-color 0.2s;
}

.principle-card:hover {
  border-color: rgba(229, 165, 75, 0.3);
}

.principle-card h3 {
  color: #e5a54b;
  font-size: 1.05rem;
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.principle-card p {
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Architecture diagram */
.architecture-box {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  padding: 2rem;
  overflow-x: auto;
}

.architecture-box pre {
  color: #e5a54b;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.85rem;
  line-height: 1.5;
  margin: 0;
  white-space: pre;
}

/* Claim example */
.claim-example {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(229, 165, 75, 0.15);
  border-radius: 10px;
  padding: 1.75rem;
  overflow-x: auto;
}

.claim-example pre {
  color: #d1d5db;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.85rem;
  line-height: 1.6;
  margin: 0;
}

.claim-example .key {
  color: #e5a54b;
}

.claim-example .string {
  color: #a8c97f;
}

.claim-example .number {
  color: #7db3e0;
}

/* How it works steps */
.steps {
  display: grid;
  gap: 1.5rem;
  counter-reset: step;
}

.step {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 10px;
  padding: 1.5rem;
}

.step-num {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #e5a54b, #c9853a);
  color: #111318;
  border-radius: 50%;
  font-weight: 700;
  font-size: 1rem;
}

.step-content h3 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 0.35rem;
}

.step-content p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.92rem;
  line-height: 1.5;
}

.step-content code {
  background: rgba(229, 165, 75, 0.12);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.85rem;
  color: #e5a54b;
  font-family: 'SF Mono', 'Fira Code', monospace;
}

/* Spec index table */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

.spec-table th,
.spec-table td {
  padding: 1rem 1.25rem;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.spec-table th {
  color: #e5a54b;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.spec-table td a {
  color: #fff;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.spec-table td a:hover {
  color: #e5a54b;
}

.spec-table .doc-num {
  color: rgba(255, 255, 255, 0.4);
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.9rem;
}

.spec-table tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

/* Spec document page */
.spec-page {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 3rem;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.spec-sidebar {
  position: sticky;
  top: 90px;
  align-self: start;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
}

.spec-sidebar h4 {
  color: #e5a54b;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
  font-weight: 600;
}

.spec-sidebar ul {
  list-style: none;
}

.spec-sidebar li {
  margin-bottom: 0.25rem;
}

.spec-sidebar a {
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  font-size: 0.85rem;
  display: block;
  padding: 0.35rem 0.75rem;
  border-radius: 4px;
  border-left: 2px solid transparent;
  transition: all 0.2s;
}

.spec-sidebar a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.04);
}

.spec-sidebar a.active {
  color: #e5a54b;
  border-left-color: #e5a54b;
  background: rgba(229, 165, 75, 0.08);
}

/* Spec content rendered markdown */
.spec-content {
  min-width: 0;
  padding-bottom: 4rem;
}

.spec-content h1 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  background: linear-gradient(90deg, #e5a54b, #c9853a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.spec-content h2 {
  font-size: 1.5rem;
  margin-top: 3rem;
  margin-bottom: 1rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  color: #e5a54b;
}

.spec-content h3 {
  font-size: 1.15rem;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: #c9a06c;
}

.spec-content h4 {
  font-size: 1rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: rgba(255, 255, 255, 0.9);
}

.spec-content p {
  margin-bottom: 1rem;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.7;
}

.spec-content a {
  color: #e5a54b;
  text-decoration: none;
  border-bottom: 1px solid rgba(229, 165, 75, 0.3);
  transition: border-color 0.2s;
}

.spec-content a:hover {
  border-bottom-color: #e5a54b;
}

.spec-content ul,
.spec-content ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
  color: rgba(255, 255, 255, 0.8);
}

.spec-content li {
  margin-bottom: 0.4rem;
  line-height: 1.6;
}

.spec-content code {
  background: rgba(229, 165, 75, 0.1);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.88em;
  color: #e5a54b;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
}

.spec-content pre {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  padding: 1.25rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

.spec-content pre code {
  background: none;
  padding: 0;
  color: #d1d5db;
  font-size: 0.85rem;
  line-height: 1.6;
}

.spec-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  font-size: 0.92rem;
}

.spec-content th {
  text-align: left;
  padding: 0.75rem 1rem;
  background: rgba(229, 165, 75, 0.08);
  border-bottom: 2px solid rgba(229, 165, 75, 0.2);
  color: #e5a54b;
  font-weight: 600;
  font-size: 0.85rem;
}

.spec-content td {
  padding: 0.65rem 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: rgba(255, 255, 255, 0.8);
}

.spec-content td code {
  font-size: 0.85em;
}

.spec-content blockquote {
  border-left: 3px solid #e5a54b;
  padding: 0.75rem 1.25rem;
  margin-bottom: 1rem;
  background: rgba(229, 165, 75, 0.05);
  border-radius: 0 6px 6px 0;
  color: rgba(255, 255, 255, 0.75);
}

.spec-content strong {
  color: #fff;
}

.spec-content em {
  color: rgba(255, 255, 255, 0.85);
}

/* Spec navigation (prev/next) */
.spec-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.spec-nav a {
  color: #e5a54b;
  text-decoration: none;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: opacity 0.2s;
}

.spec-nav a:hover {
  opacity: 0.8;
}

.spec-nav .next {
  margin-left: auto;
}

/* Page header (non-hero pages) */
.page-header {
  padding: 3rem 2rem 2rem;
  text-align: center;
}

.page-header h1 {
  font-size: 2.2rem;
  background: linear-gradient(90deg, #e5a54b, #c9853a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.75rem;
}

.page-header p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

/* SDK page */
.sdk-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.sdk-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  padding: 1.75rem;
}

.sdk-card h3 {
  color: #e5a54b;
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
  font-family: 'SF Mono', 'Fira Code', monospace;
}

.sdk-card p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.92rem;
  margin-bottom: 1rem;
  line-height: 1.5;
}

.sdk-card .func-list {
  list-style: none;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.85rem;
}

.sdk-card .func-list li {
  padding: 0.3rem 0;
  color: #a8c97f;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.sdk-card .func-list li:last-child {
  border-bottom: none;
}

.install-box {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(229, 165, 75, 0.15);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.install-box code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.95rem;
  color: #e5a54b;
}

.install-box .label {
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Test vectors */
.tv-grid {
  display: grid;
  gap: 1rem;
}

.tv-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 10px;
  padding: 1.5rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1.25rem;
  align-items: center;
}

.tv-num {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.tv-accept .tv-num {
  background: rgba(168, 201, 127, 0.12);
  color: #a8c97f;
  border: 1px solid rgba(168, 201, 127, 0.25);
}

.tv-reject .tv-num {
  background: rgba(220, 90, 90, 0.12);
  color: #dc5a5a;
  border: 1px solid rgba(220, 90, 90, 0.25);
}

.tv-info h3 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.tv-info p {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.88rem;
}

.tv-result {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.8rem;
  padding: 0.35rem 0.75rem;
  border-radius: 4px;
  font-weight: 600;
  white-space: nowrap;
}

.tv-accept .tv-result {
  background: rgba(168, 201, 127, 0.1);
  color: #a8c97f;
}

.tv-reject .tv-result {
  background: rgba(220, 90, 90, 0.1);
  color: #dc5a5a;
}

/* Schema page */
.schema-block {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  padding: 1.5rem;
  overflow-x: auto;
}

.schema-block pre {
  color: #d1d5db;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.82rem;
  line-height: 1.6;
  margin: 0;
  white-space: pre;
}

/* Footer */
.site-footer {
  background: rgba(0, 0, 0, 0.35);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 3rem 2rem 1.5rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 2rem;
  max-width: 1100px;
  margin: 0 auto 2rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.footer-logo img {
  width: 28px;
  height: 28px;
}

.footer-logo span {
  font-size: 1.15rem;
  font-weight: 700;
  background: linear-gradient(90deg, #e5a54b, #c9853a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-tagline {
  color: #7a7f8a;
  font-size: 0.88rem;
  line-height: 1.5;
  max-width: 280px;
}

.footer-section h4 {
  color: #e5a54b;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: 0.5rem;
}

.footer-section a {
  color: #7a7f8a;
  text-decoration: none;
  font-size: 0.88rem;
  transition: color 0.2s;
}

.footer-section a:hover {
  color: #e5a54b;
}

.footer-bottom {
  text-align: center;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  max-width: 1100px;
  margin: 0 auto;
}

.footer-bottom p {
  color: #555964;
  font-size: 0.85rem;
}

/* 404 page */
.not-found {
  text-align: center;
  padding: 6rem 2rem;
}

.not-found h1 {
  font-size: 6rem;
  background: linear-gradient(90deg, #e5a54b, #c9853a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.not-found p {
  color: rgba(255, 255, 255, 0.5);
  font-size: 1.1rem;
  margin: 1rem 0 2rem;
}

/* Responsive */
@media (max-width: 900px) {
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-brand {
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: flex;
  }

  .header-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(17, 19, 24, 0.98);
    flex-direction: column;
    padding: 1rem 2rem;
    gap: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .header-nav.open {
    display: flex;
  }

  .header-nav a {
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .spec-page {
    grid-template-columns: 1fr;
    padding: 1rem;
  }

  .spec-sidebar {
    position: static;
    display: none;
  }

  .tv-card {
    grid-template-columns: auto 1fr;
  }

  .tv-result {
    grid-column: 2;
  }
}

@media (max-width: 500px) {
  .footer-content {
    grid-template-columns: 1fr;
  }
  .footer-brand {
    grid-column: span 1;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

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