/* ══════════════════════════════════════════════════════════
   TOP SHELF SERVICE LLC — Design System
   ══════════════════════════════════════════════════════════ */

:root {
  --ts-black: #050507;
  --ts-charcoal: #181a1f;
  --ts-slate: #2c3036;
  --ts-mist: #f3f4f6;
  --ts-green: #22c55e;
  --ts-amber: #f59e0b;
  --ts-red: #ef4444;

  --bg: var(--ts-black);
  --bg-elevated: #0c0e12;
  --bg-soft: var(--ts-charcoal);
  --surface: #111318;
  --surface-2: #151920;
  --surface-3: #1b2028;

  --border: rgba(243, 244, 246, 0.1);
  --border-strong: rgba(243, 244, 246, 0.18);

  --text: var(--ts-mist);
  --text-muted: rgba(243, 244, 246, 0.74);
  --text-soft: rgba(243, 244, 246, 0.58);

  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.24);
  --shadow-card: 0 14px 40px rgba(0, 0, 0, 0.28);

  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --container: 1200px;
  --transition: 180ms ease;
  --header-height: 84px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  font-size: 1rem;
  background-color: var(--ts-black);
  background-image:
    radial-gradient(circle at top right, rgba(34, 197, 94, 0.08), transparent 28%),
    radial-gradient(circle at 20% 0%, rgba(245, 158, 11, 0.05), transparent 20%),
    linear-gradient(180deg, #07080b 0%, #050507 100%);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
}

button,
input,
textarea,
select {
  font: inherit;
}

:focus-visible {
  outline: 3px solid rgba(34, 197, 94, 0.75);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--ts-green);
  color: var(--ts-black);
  padding: 0.75rem 1rem;
  border-radius: 0.75rem;
  font-weight: 700;
  z-index: 1000;
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

.site-shell {
  min-height: 100vh;
}

.container {
  width: min(calc(100% - 2rem), var(--container));
  margin: 0 auto;
}

.section {
  padding: 5rem 0;
}

.section-hero {
  padding-top: calc(var(--header-height) + 3rem);
  padding-bottom: 4rem;
}

.section-divider {
  padding-top: 0;
  padding-bottom: 0;
}

.rule {
  height: 1px;
  background: linear-gradient(
    90deg,
    rgba(243, 244, 246, 0),
    rgba(243, 244, 246, 0.12),
    rgba(243, 244, 246, 0)
  );
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(5, 5, 7, 0.72);
  border-bottom: 1px solid rgba(243, 244, 246, 0.06);
}

.header-inner {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.875rem;
  text-decoration: none;
  min-width: 0;
}

.brand-mark {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  background: linear-gradient(135deg, var(--ts-green), #117a37);
  box-shadow:
    0 0 0 1px rgba(34, 197, 94, 0.25),
    0 0 24px rgba(34, 197, 94, 0.18);
  flex: 0 0 auto;
}

.brand-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.brand-name {
  font-family: "Montserrat", system-ui, sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 0.98rem;
}

.brand-tag {
  color: var(--text-soft);
  font-size: 0.82rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  text-decoration: none;
}

.site-nav ul a {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
}

.site-nav ul a:hover,
.site-nav ul a:focus-visible {
  color: var(--text);
}

.nav-toggle {
  display: none;
  width: 46px;
  height: 46px;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 12px;
  cursor: pointer;
  padding: 0;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  margin: 5px auto;
  border-radius: 999px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1rem;
  color: var(--ts-green);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Montserrat", system-ui, sans-serif;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

h1 {
  font-size: clamp(2.6rem, 6vw, 5.25rem);
  font-weight: 800;
  max-width: 12ch;
}

h2 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 700;
  max-width: 14ch;
}

h3 {
  font-size: 1.15rem;
  font-weight: 700;
}

p {
  margin: 0;
  color: var(--text-muted);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
  align-items: center;
}

.hero-copy {
  max-width: 700px;
}

.hero-lead {
  margin-top: 1.5rem;
  font-size: clamp(1.125rem, 2vw, 1.35rem);
  max-width: 60ch;
}

.hero-subcopy {
  margin-top: 1rem;
  max-width: 62ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2rem;
}

.trust-line {
  margin-top: 1.25rem;
  color: var(--text-soft);
  font-size: 0.96rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.9rem 1.15rem;
  border-radius: 999px;
  text-decoration: none;
  border: 1px solid transparent;
  font-weight: 600;
  font-size: 0.9375rem;
  transition:
    transform var(--transition),
    border-color var(--transition),
    background-color var(--transition),
    color var(--transition),
    box-shadow var(--transition);
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button-sm {
  min-height: 42px;
  padding: 0.7rem 1rem;
  font-size: 0.875rem;
}

.button-primary {
  background: var(--ts-green);
  color: var(--ts-black);
  box-shadow: 0 10px 24px rgba(34, 197, 94, 0.2);
}

.button-primary:hover,
.button-primary:focus-visible {
  background: #29d063;
  box-shadow: 0 12px 28px rgba(34, 197, 94, 0.28);
}

.button-secondary,
.button-outline {
  background: rgba(243, 244, 246, 0.02);
  color: var(--text);
  border-color: var(--border-strong);
}

.button-secondary:hover,
.button-secondary:focus-visible,
.button-outline:hover,
.button-outline:focus-visible {
  background: rgba(243, 244, 246, 0.05);
  border-color: rgba(243, 244, 246, 0.28);
}

.hero-panel {
  position: relative;
}

.panel-frame {
  position: relative;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.015)),
    var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 1.25rem;
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.panel-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(34, 197, 94, 0.08), transparent 30%, transparent 70%, rgba(245, 158, 11, 0.06)),
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: auto, 28px 28px, 28px 28px;
  pointer-events: none;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), rgba(0, 0, 0, 1));
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), rgba(0, 0, 0, 1));
}

.panel-header,
.panel-footer {
  position: relative;
  z-index: 1;
}

.panel-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(243, 244, 246, 0.08);
}

.panel-dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
}

.panel-dot-green {
  background: var(--ts-green);
  box-shadow: 0 0 10px rgba(34, 197, 94, 0.5);
}

.panel-title {
  color: var(--text);
  font-weight: 600;
  font-size: 0.95rem;
}

.signal-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
  padding: 1rem 0 1.2rem;
}

.signal-card {
  background: rgba(17, 19, 24, 0.82);
  border: 1px solid rgba(243, 244, 246, 0.07);
  border-radius: var(--radius-md);
  padding: 1rem;
  min-height: 154px;
}

.signal-kicker {
  display: inline-block;
  color: var(--ts-amber);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
  margin-bottom: 0.8rem;
}

.signal-card h3 {
  font-size: 1.18rem;
  max-width: none;
  margin-bottom: 0.4rem;
}

.signal-card p {
  color: var(--text-soft);
  font-size: 0.95rem;
}

.panel-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid rgba(243, 244, 246, 0.08);
  padding-top: 1rem;
  flex-wrap: wrap;
}

.panel-stat {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.panel-stat-label {
  color: var(--text-soft);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.section-heading {
  max-width: 780px;
  margin-bottom: 2rem;
}

.section-heading h2 {
  margin-bottom: 1rem;
}

.section-heading p {
  max-width: 68ch;
}

.section-heading.compact {
  margin-bottom: 0;
}

.card-grid,
.principles-grid,
.model-grid {
  display: grid;
  gap: 1rem;
}

.card-grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card,
.principle-card,
.model-card,
.stack-item,
.audience-panel {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.01));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

.feature-card,
.principle-card,
.model-card,
.stack-item {
  padding: 1.35rem;
}

.feature-card {
  min-height: 240px;
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  margin-bottom: 1rem;
  border-radius: 999px;
  background: rgba(34, 197, 94, 0.12);
  color: var(--ts-green);
  font-weight: 700;
  font-size: 0.9rem;
  border: 1px solid rgba(34, 197, 94, 0.22);
}

.feature-card h3,
.principle-card h3,
.model-card h3,
.stack-item h3 {
  margin-bottom: 0.7rem;
}

.two-column {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 1.5rem;
  align-items: start;
}

.stack-list {
  display: grid;
  gap: 1rem;
}

.principles-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.fit-layout {
  align-items: stretch;
}

.audience-panel {
  padding: 1.5rem;
}

.audience-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.85rem;
}

.audience-list li {
  position: relative;
  padding-left: 1.2rem;
  color: var(--text-muted);
}

.audience-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7rem;
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--ts-green);
}

.audience-note {
  margin-top: 1rem;
  color: var(--text-soft);
}

.section-highlight {
  position: relative;
}

.section-highlight::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(34, 197, 94, 0.03), transparent 35%),
    linear-gradient(0deg, rgba(245, 158, 11, 0.025), transparent 30%);
  pointer-events: none;
}

.model-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.model-card-accent {
  border-color: rgba(34, 197, 94, 0.22);
}

.model-note {
  margin-top: 1rem;
  padding: 1.1rem 1.25rem;
  border-left: 3px solid var(--ts-green);
  background: rgba(34, 197, 94, 0.06);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.cta-section {
  padding-top: 4rem;
  padding-bottom: 5rem;
}

.cta-panel {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 1.25rem;
  align-items: center;
  padding: 2rem;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(243, 244, 246, 0.09);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.02)),
    linear-gradient(135deg, rgba(34, 197, 94, 0.08), transparent 34%),
    var(--surface-2);
  box-shadow: var(--shadow-card);
}

.cta-copy h2 {
  margin-bottom: 1rem;
}

.cta-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.9rem;
}

.contact-note {
  color: var(--text-soft);
  font-size: 0.95rem;
}

.contact-note a {
  color: var(--text);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

.site-footer {
  border-top: 1px solid rgba(243, 244, 246, 0.08);
  padding: 2rem 0 1.25rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  align-items: flex-start;
  padding-bottom: 1.5rem;
}

.brand-footer {
  margin-bottom: 1rem;
}

.footer-microcopy {
  max-width: 60ch;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.85rem 1.25rem;
}

.footer-nav a {
  color: var(--text-muted);
  font-size: 0.875rem;
  text-decoration: none;
  transition: color var(--transition);
}

.footer-nav a:hover,
.footer-nav a:focus-visible {
  color: var(--text);
}

.footer-bottom {
  padding-top: 1rem;
  border-top: 1px solid rgba(243, 244, 246, 0.06);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.875rem;
}

.feature-card,
.principle-card,
.model-card,
.stack-item,
.audience-panel,
.panel-frame {
  transition:
    transform var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

.feature-card:hover,
.feature-card:focus-within,
.principle-card:hover,
.principle-card:focus-within,
.model-card:hover,
.model-card:focus-within,
.stack-item:hover,
.stack-item:focus-within,
.audience-panel:hover,
.audience-panel:focus-within {
  transform: translateY(-2px);
  border-color: rgba(243, 244, 246, 0.16);
}

/* ══════════════════════════════
   RESPONSIVE — TABLET
   ══════════════════════════════ */
@media (max-width: 1080px) {
  .hero-grid,
  .two-column,
  .cta-panel,
  .card-grid-3,
  .principles-grid,
  .model-grid {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    max-width: none;
  }

  .section-heading h2,
  h2 {
    max-width: none;
  }
}

/* ══════════════════════════════
   RESPONSIVE — MOBILE NAV
   ══════════════════════════════ */
@media (max-width: 860px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 1rem;
    left: 1rem;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    background: rgba(12, 14, 18, 0.98);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .site-nav ul a {
    font-size: 1rem;
    padding: 0.25rem 0;
  }

  .site-nav .button {
    width: 100%;
    margin-top: 0.5rem;
  }

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

  .footer-inner {
    flex-direction: column;
  }

  .footer-nav {
    justify-content: flex-start;
  }
}

/* ══════════════════════════════
   RESPONSIVE — SMALL SCREENS
   ══════════════════════════════ */
@media (max-width: 640px) {
  :root {
    --header-height: 76px;
  }

  .section {
    padding: 3.5rem 0;
  }

  .section-hero {
    padding-top: calc(var(--header-height) + 2rem);
    padding-bottom: 3rem;
  }

  .container {
    width: min(calc(100% - 1.25rem), var(--container));
  }

  h1 {
    font-size: clamp(2rem, 8vw, 2.6rem);
  }

  h2 {
    font-size: clamp(1.6rem, 6vw, 2rem);
  }

  .panel-frame,
  .cta-panel,
  .feature-card,
  .principle-card,
  .model-card,
  .stack-item,
  .audience-panel {
    border-radius: 18px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .button,
  .cta-actions .button {
    width: 100%;
  }

  .cta-panel {
    padding: 1.35rem;
  }

  .panel-footer,
  .footer-bottom {
    flex-direction: column;
  }

  .brand-name {
    font-size: 0.92rem;
  }

  .brand-tag {
    font-size: 0.78rem;
  }

  .feature-card {
    min-height: auto;
  }
}

/* ══════════════════════════════
   REDUCED MOTION
   ══════════════════════════════ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}