/* ======================================================
   TensorNest — Shared Stylesheet
   ====================================================== */

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

:root {
  --color-bg: #0d1117;
  --color-surface: #161b22;
  --color-border: #21262d;
  --color-primary: #58a6ff;
  --color-primary-dark: #1f6feb;
  --color-accent: #a371f7;
  --color-text: #c9d1d9;
  --color-text-muted: #8b949e;
  --color-heading: #f0f6fc;
  --color-white: #ffffff;
  --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --radius: 8px;
  --max-width: 960px;
  --transition: 0.2s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  min-height: 100vh;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-white);
  text-decoration: underline;
}

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

/* ---------- Layout Helpers ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Navigation ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-heading);
  text-decoration: none;
}

.nav-logo:hover {
  color: var(--color-white);
  text-decoration: none;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-accent));
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  color: white;
  font-weight: 800;
  letter-spacing: -1px;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--color-text);
  text-decoration: none;
}

/* ---------- Hero ---------- */
.hero {
  padding: 96px 0 80px;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-bottom: 28px;
  background: var(--color-surface);
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  color: var(--color-heading);
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.03em;
}

.hero h1 span {
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto 40px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 24px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--color-primary-dark);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-primary);
  color: var(--color-white);
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  background: var(--color-surface);
  color: var(--color-heading);
  text-decoration: none;
}

/* ---------- Section Titles ---------- */
.section-title {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

/* ---------- Features Section ---------- */
.section-features {
  padding: 80px 0;
  border-top: 1px solid var(--color-border);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 28px;
  transition: border-color var(--transition);
}

.feature-card:hover {
  border-color: var(--color-primary-dark);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ---------- Apps Section ---------- */
.section-apps {
  padding: 80px 0;
  border-top: 1px solid var(--color-border);
}

.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.app-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: border-color var(--transition);
}

.app-card:hover {
  border-color: var(--color-accent);
}

.app-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
}

.app-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-heading);
}

.app-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  flex: 1;
}

.app-badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(88, 166, 255, 0.15);
  color: var(--color-primary);
  border: 1px solid rgba(88, 166, 255, 0.3);
}

.app-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.app-links a {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.app-links a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

/* ---------- CTA Section ---------- */
.section-cta {
  padding: 80px 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.section-cta h2 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 14px;
}

.section-cta p {
  color: var(--color-text-muted);
  margin-bottom: 32px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 40px 0;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: var(--color-text-muted);
}

.footer-links a:hover {
  color: var(--color-text);
  text-decoration: none;
}

/* ---------- Privacy Policy Page ---------- */
.page-hero {
  padding: 72px 0 48px;
  border-bottom: 1px solid var(--color-border);
}

.page-hero .breadcrumb {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.page-hero .breadcrumb a {
  color: var(--color-text-muted);
}

.page-hero .breadcrumb a:hover {
  color: var(--color-primary);
}

.page-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  color: var(--color-heading);
  margin-bottom: 12px;
  letter-spacing: -0.03em;
}

.page-hero .meta {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.meta-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-border);
}

/* ---------- Privacy Policy Content ---------- */
.policy-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 48px;
  padding: 48px 0 80px;
  align-items: start;
}

.policy-toc {
  position: sticky;
  top: 80px;
}

.policy-toc h2 {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 14px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.toc-list a {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  padding: 5px 0;
  border-left: 2px solid transparent;
  padding-left: 10px;
}

.toc-list a:hover {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  text-decoration: none;
}

.policy-content section {
  margin-bottom: 48px;
}

.policy-content h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 16px;
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
}

.policy-content h2:first-child,
.policy-content section:first-child h2 {
  border-top: none;
  padding-top: 0;
}

.policy-content p {
  margin-bottom: 14px;
  color: var(--color-text);
}

.policy-content ul,
.policy-content ol {
  margin: 10px 0 14px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.policy-content li {
  color: var(--color-text);
  font-size: 0.95rem;
}

.policy-content strong {
  color: var(--color-heading);
  font-weight: 600;
}

.policy-content a {
  color: var(--color-primary);
}

.info-box {
  background: rgba(88, 166, 255, 0.07);
  border: 1px solid rgba(88, 166, 255, 0.25);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 20px;
  font-size: 0.9rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .policy-layout {
    grid-template-columns: 1fr;
  }

  .policy-toc {
    display: none;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}