:root {
  --sb-bg: #050816;
  --sb-bg-alt: #0b1020;
  --sb-accent: #2dd4bf;
  --sb-accent-soft: rgba(45, 212, 191, 0.12);
  --sb-text: #e5e7eb;
  --sb-muted: #9ca3af;
  --sb-border: #1f2937;
  --sb-danger: #f97373;
  --sb-radius-lg: 18px;
  --sb-radius-xl: 26px;
  --sb-shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.55);
  --sb-container-max: 1120px;
  --sb-font: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--sb-font);
  background: radial-gradient(circle at top, #111827 0, #020617 55%, #020617 100%);
  color: var(--sb-text);
}

/* Layout */

.sb-container {
  max-width: var(--sb-container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.sb-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: linear-gradient(to bottom, rgba(2, 6, 23, 0.9), rgba(2, 6, 23, 0.82));
  border-bottom: 1px solid rgba(148, 163, 184, 0.16);
}

.sb-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0.3rem;
}

/* Logo */

.sb-logo {
  display: flex;
  flex-direction: column;
}

.sb-logo-main {
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.95rem;
}

.sb-logo-sub {
  font-size: 0.75rem;
  color: var(--sb-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* Nav */

.sb-nav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  font-size: 0.9rem;
}

.sb-nav a {
  text-decoration: none;
  color: var(--sb-muted);
  padding: 0.4rem 0.2rem;
  border-radius: 999px;
  transition: color 0.15s ease, background 0.15s ease;
}

.sb-nav a:hover {
  color: var(--sb-text);
  background: rgba(15, 23, 42, 0.9);
}

.sb-nav a.active {
  color: var(--sb-accent);
}

.sb-btn-nav {
  border: 1px solid rgba(148, 163, 184, 0.35);
  padding: 0.45rem 0.95rem !important;
}

/* Hero */

.sb-hero {
  padding: 3.5rem 0 2.5rem;
}

.sb-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1.1fr);
  gap: 3rem;
  align-items: center;
}

.sb-hero-copy h1 {
  font-size: clamp(2.2rem, 2.8vw + 1rem, 2.9rem);
  line-height: 1.15;
  margin-bottom: 1rem;
}

.sb-hero-copy p {
  margin-top: 0;
  margin-bottom: 1.4rem;
  color: var(--sb-muted);
  max-width: 34rem;
}

.sb-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.3rem;
}

.sb-btn-primary,
.sb-btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.3rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.9rem;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.1s ease, box-shadow 0.15s ease, background 0.2s ease, border-color 0.2s ease;
}

.sb-btn-primary {
  background: linear-gradient(135deg, #22c1c3, #2dd4bf);
  color: #011126;
  box-shadow: 0 12px 30px rgba(45, 212, 191, 0.35);
  font-weight: 600;
}

.sb-btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 45px rgba(45, 212, 191, 0.45);
}

.sb-btn-secondary {
  background: rgba(15, 23, 42, 0.9);
  border-color: rgba(148, 163, 184, 0.35);
  color: var(--sb-text);
}

.sb-btn-secondary:hover {
  background: rgba(15, 23, 42, 1);
}

.sb-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.sb-hero-tags span {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.25);
  color: var(--sb-muted);
}

/* Hero right */

.sb-hero-highlight {
  display: flex;
  justify-content: flex-end;
}

.sb-hero-card {
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.16), transparent 55%),
              radial-gradient(circle at bottom right, rgba(45, 212, 191, 0.2), transparent 50%),
              var(--sb-bg-alt);
  border-radius: var(--sb-radius-xl);
  padding: 1.7rem 1.6rem;
  border: 1px solid rgba(148, 163, 184, 0.25);
  box-shadow: var(--sb-shadow-soft);
}

.sb-hero-card h2 {
  margin-top: 0;
  margin-bottom: 0.6rem;
  font-size: 1.3rem;
}

.sb-hero-card p {
  margin-top: 0;
  margin-bottom: 1rem;
  font-size: 0.9rem;
  color: var(--sb-muted);
}

.sb-hero-card ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
  font-size: 0.85rem;
  color: var(--sb-text);
}

.sb-hero-card li {
  padding-left: 0.95rem;
  position: relative;
  margin-bottom: 0.35rem;
}

.sb-hero-card li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--sb-accent);
}

/* Sections */

.sb-page-content {
  padding: 1.8rem 0 2.8rem;
}

.sb-section {
  margin-bottom: 2.4rem;
}

.sb-section h2 {
  margin-top: 0;
  margin-bottom: 1.2rem;
  font-size: 1.4rem;
}

/* Cards & grids */

.sb-grid {
  display: grid;
  gap: 1.4rem;
}

.sb-grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.sb-grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.sb-card {
  background: linear-gradient(145deg, rgba(15, 23, 42, 0.98), rgba(15, 23, 42, 0.9));
  border-radius: var(--sb-radius-lg);
  padding: 1.1rem 1.1rem 1.0rem;
  border: 1px solid rgba(55, 65, 81, 0.9);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.6);
}

.sb-card h3, .sb-card h2 {
  margin-top: 0;
  margin-bottom: 0.6rem;
}

.sb-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--sb-muted);
}

/* Lists */

.sb-list {
  list-style: none;
  padding-left: 0;
  margin: 0.6rem 0 0;
  font-size: 0.9rem;
}

.sb-list li {
  margin-bottom: 0.45rem;
}

.sb-list li::before {
  content: "– ";
  color: var(--sb-accent);
}

/* Forms */

.sb-form {
  max-width: 520px;
}

.sb-form-row {
  margin-bottom: 1rem;
  display: flex;
  flex-direction: column;
}

.sb-form-row label {
  font-size: 0.85rem;
  margin-bottom: 0.25rem;
}

.sb-form-row label span {
  color: var(--sb-danger);
  margin-left: 0.2rem;
}

.sb-form-row input,
.sb-form-row textarea {
  border-radius: 10px;
  border: 1px solid var(--sb-border);
  background: rgba(15, 23, 42, 0.95);
  color: var(--sb-text);
  padding: 0.6rem 0.7rem;
  font: inherit;
  resize: vertical;
}

.sb-form-row input:focus,
.sb-form-row textarea:focus {
  outline: 1px solid var(--sb-accent);
  outline-offset: 1px;
  border-color: var(--sb-accent);
}

/* Flash */

.sb-flash {
  background: var(--sb-accent-soft);
  border-radius: 12px;
  border: 1px solid rgba(45, 212, 191, 0.6);
  padding: 0.75rem 0.8rem;
  margin-bottom: 1.2rem;
  font-size: 0.9rem;
}

/* Footer */

.sb-footer {
  border-top: 1px solid rgba(15, 23, 42, 0.9);
  padding: 1rem 0 1.5rem;
  background: rgba(2, 6, 23, 0.96);
}

.sb-footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--sb-muted);
}

.sb-footer-right {
  text-align: right;
}

/* Misc */

.sb-contact-note {
  margin-top: 1.1rem;
  font-size: 0.85rem;
  color: var(--sb-muted);
}

/* Responsive */

@media (max-width: 840px) {
  .sb-hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }
  .sb-hero {
    padding-top: 2.4rem;
  }
  .sb-hero-highlight {
    justify-content: stretch;
  }
}

@media (max-width: 640px) {
  .sb-header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
  }
  .sb-nav {
    width: 100%;
    justify-content: flex-start;
    flex-wrap: wrap;
  }
}