:root {
  --cs-font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --cs-font-mono: 'Share Tech Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --cs-bg: #05060a;
  --cs-bg-glow: #0b1020;
  --cs-glow-a: rgba(79, 70, 229, 0.28);
  --cs-glow-b: rgba(34, 197, 94, 0.22);
  --cs-surface: #0b0d14;
  --cs-surface-soft: #10121c;
  --cs-border: rgba(148, 163, 184, 0.35);

  --cs-text: #e5f0ff;
  --cs-text-muted: #8b9bb5;
  --cs-text-faint: #4a5670;

  --cs-primary: #4f46e5;
  --cs-primary-soft: rgba(79, 70, 229, 0.12);
  --cs-primary-strong: #6366f1;

  --cs-accent: #22c55e;
  --cs-accent-soft: rgba(34, 197, 94, 0.1);

  --cs-radius-sm: 0.4rem;
  --cs-radius-md: 0.7rem;
  --cs-radius-lg: 1.2rem;

  --cs-space-2: 0.5rem;
  --cs-space-3: 0.75rem;
  --cs-space-4: 1rem;
  --cs-space-6: 1.5rem;
  --cs-space-8: 2rem;
  --cs-space-12: 3rem;
  --cs-space-16: 4rem;

  --cs-shadow-soft: 0 18px 40px rgba(15, 23, 42, 0.7);
}

/* THEMES */

html[data-theme="ocean"] {
  --cs-bg: #020617;
  --cs-bg-glow: #061c2e;
  --cs-glow-a: rgba(14, 165, 233, 0.28);
  --cs-glow-b: rgba(20, 184, 166, 0.22);
  --cs-surface: #061622;
  --cs-surface-soft: #081c2c;
  --cs-primary: #0ea5e9;
  --cs-primary-soft: rgba(14, 165, 233, 0.12);
  --cs-primary-strong: #38bdf8;
  --cs-accent: #14b8a6;
  --cs-accent-soft: rgba(20, 184, 166, 0.1);
}

html[data-theme="terminal"] {
  --cs-bg: #000000;
  --cs-bg-glow: #071006;
  --cs-glow-a: rgba(34, 197, 94, 0.3);
  --cs-glow-b: rgba(57, 255, 20, 0.18);
  --cs-surface: #060a06;
  --cs-surface-soft: #0a120a;
  --cs-border: rgba(34, 197, 94, 0.35);
  --cs-text: #d1fae5;
  --cs-text-muted: #6ee7a3;
  --cs-text-faint: #2f6b45;
  --cs-primary: #22c55e;
  --cs-primary-soft: rgba(34, 197, 94, 0.12);
  --cs-primary-strong: #39ff14;
  --cs-accent: #4ade80;
  --cs-accent-soft: rgba(74, 222, 128, 0.1);
}

html[data-theme="lava"] {
  --cs-bg: #0a0503;
  --cs-bg-glow: #1e0d06;
  --cs-glow-a: rgba(239, 68, 68, 0.3);
  --cs-glow-b: rgba(245, 158, 11, 0.2);
  --cs-surface: #1a0a05;
  --cs-surface-soft: #200d06;
  --cs-primary: #ef4444;
  --cs-primary-soft: rgba(239, 68, 68, 0.12);
  --cs-primary-strong: #f97316;
  --cs-accent: #f59e0b;
  --cs-accent-soft: rgba(245, 158, 11, 0.1);
}

html[data-theme="aurora"] {
  --cs-bg: #0a0512;
  --cs-bg-glow: #1c0e30;
  --cs-glow-a: rgba(168, 85, 247, 0.3);
  --cs-glow-b: rgba(236, 72, 153, 0.2);
  --cs-surface: #150a24;
  --cs-surface-soft: #1c0e30;
  --cs-primary: #a855f7;
  --cs-primary-soft: rgba(168, 85, 247, 0.12);
  --cs-primary-strong: #c084fc;
  --cs-accent: #ec4899;
  --cs-accent-soft: rgba(236, 72, 153, 0.1);
}

/* RESET / BASE */

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

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--cs-font-body);
  background: radial-gradient(circle at top, var(--cs-bg-glow) 0, var(--cs-bg) 55%);
  color: var(--cs-text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

/* NAV */

.cs-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  background: linear-gradient(180deg, rgba(5, 6, 10, 0.9), transparent);
  border-bottom: 1px solid rgba(148, 163, 184, 0.25);
}

.cs-nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: var(--cs-space-3) var(--cs-space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--cs-space-4);
}

.cs-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--cs-space-2);
  font-family: var(--cs-font-mono);
  letter-spacing: 0.16em;
  font-size: 0.82rem;
  text-transform: uppercase;
  color: var(--cs-primary-strong);
}

/* wrapper around logo for fullscreen positioning */
.cs-logo-wrap {
  display: inline-block;
}

/* normal logo */
.cs-logo-img {
  width: auto;
  height: 52px;                 /* bigger logo */
  border-radius: 10px;
  object-fit: contain;
  background: radial-gradient(circle, rgba(129,140,248,0.25), transparent 70%);
  padding: 4px;
  cursor: default;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.cs-logo-img:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 18px rgba(129, 140, 248, 0.55);
}

/* fullscreen ON IMAGE */
.cs-logo-img.cs-logo-fullscreen {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);  /* true center */
  max-width: 90vw;
  max-height: 90vh;
  z-index: 9999;
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.8);
}

/* normal hover */
.cs-logo-img:not(.cs-logo-fullscreen):hover {
  transform: scale(1.04);
  box-shadow: 0 0 16px rgba(129, 140, 248, 0.6);
}

/* overlay */
.cs-logo-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 9998;
}

.cs-nav-links {
  display: flex;
  gap: var(--cs-space-4);
  font-family: var(--cs-font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cs-text-muted);
}

.cs-nav-links a {
  position: relative;
  padding-bottom: 2px;
}

.cs-nav-links a::after {
  content: '';
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cs-primary-strong), transparent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.2s ease-out;
}

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

.cs-nav-links a:hover::after {
  transform: scaleX(1);
}

.cs-nav-links a.cs-nav-active {
  color: var(--cs-text);
}

.cs-nav-links a.cs-nav-active::after {
  transform: scaleX(1);
}

/* NAV CONTROLS (settings + hamburger) */

.cs-nav-controls {
  display: flex;
  align-items: center;
  gap: var(--cs-space-2);
}

.cs-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.4);
  background: rgba(15, 23, 42, 0.5);
  color: var(--cs-text);
  cursor: pointer;
  transition: border-color 0.18s ease, transform 0.18s ease, background 0.18s ease;
}

.cs-icon-btn:hover {
  border-color: var(--cs-primary-strong);
  transform: translateY(-1px);
}

.cs-icon-btn svg {
  width: 18px;
  height: 18px;
}

.cs-hamburger {
  display: none;
}

/* MOBILE NAV MENU */

.cs-mobile-menu {
  display: none;
  flex-direction: column;
  gap: var(--cs-space-2);
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 var(--cs-space-4) var(--cs-space-3);
  font-family: var(--cs-font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cs-text-muted);
}

.cs-mobile-menu.cs-open {
  display: flex;
}

.cs-mobile-menu a {
  padding: var(--cs-space-2) 0;
  border-bottom: 1px solid rgba(148, 163, 184, 0.15);
}

.cs-mobile-menu a:hover {
  color: var(--cs-text);
}

/* SETTINGS PANEL */

.cs-settings-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 40;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.cs-settings-overlay.cs-open {
  opacity: 1;
  pointer-events: auto;
}

.cs-settings-panel {
  position: fixed;
  top: var(--cs-nav-h, 76px);
  right: 0;
  bottom: 0;
  width: min(360px, 92vw);
  background: var(--cs-surface);
  border-left: 1px solid var(--cs-border);
  box-shadow: -20px 0 50px rgba(0, 0, 0, 0.5);
  z-index: 41;
  padding: var(--cs-space-6) var(--cs-space-4);
  transform: translateX(100%);
  transition: transform 0.25s ease;
  overflow-x: hidden;
  overflow-y: auto;
}

.cs-settings-panel.cs-open {
  transform: translateX(0);
}

.cs-settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--cs-space-6);
}

.cs-settings-title {
  margin: 0;
  font-size: 1.05rem;
}

.cs-settings-block {
  margin-bottom: var(--cs-space-6);
}

.cs-settings-label {
  display: block;
  margin-bottom: var(--cs-space-3);
  font-family: var(--cs-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cs-text-faint);
}

.cs-theme-swatches {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cs-space-3) var(--cs-space-2);
}

.cs-theme-swatch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--cs-text-muted);
  font-family: var(--cs-font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.cs-theme-swatch-dot {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  border: 2px solid transparent;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.cs-theme-swatch:hover .cs-theme-swatch-dot {
  transform: scale(1.08);
}

.cs-theme-swatch.cs-active .cs-theme-swatch-dot {
  border-color: var(--cs-text);
}

.cs-theme-swatch.cs-active {
  color: var(--cs-text);
}

.cs-swatch-default { background: linear-gradient(135deg, #6366f1, #22c55e); }
.cs-swatch-ocean { background: linear-gradient(135deg, #0ea5e9, #14b8a6); }
.cs-swatch-terminal { background: linear-gradient(135deg, #22c55e, #000000); }
.cs-swatch-lava { background: linear-gradient(135deg, #ef4444, #f59e0b); }
.cs-swatch-aurora { background: linear-gradient(135deg, #a855f7, #ec4899); }

.cs-lang-select {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border-radius: var(--cs-radius-md);
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: rgba(15, 23, 42, 0.9);
  color: var(--cs-text);
  font-family: var(--cs-font-body);
  font-size: 0.9rem;
}

.cs-lang-select:focus {
  outline: none;
  border-color: var(--cs-primary-strong);
}

/* SCROLL REVEAL */

.cs-reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.cs-reveal.cs-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .cs-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* HERO */

.cs-hero {
  padding: var(--cs-space-16) var(--cs-space-4) var(--cs-space-12);
  position: relative;
  overflow: hidden;
}

.cs-hero-inner {
  max-width: 1080px;
  margin: 0 auto;
}

.cs-eyebrow {
  font-family: var(--cs-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--cs-text-muted);
  margin-bottom: var(--cs-space-4);
}

.cs-hero-title {
  font-size: clamp(2.4rem, 4vw, 3.4rem);
  line-height: 1.08;
  margin: 0 0 var(--cs-space-4);
}

.cs-hero-title br {
  display: none;
}

@media (min-width: 640px) {
  .cs-hero-title br {
    display: inline;
  }
}

.cs-hero-sub {
  max-width: 32rem;
  color: var(--cs-text-muted);
  font-size: 0.98rem;
  line-height: 1.7;
  margin: 0 0 var(--cs-space-6);
}

.cs-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cs-space-3);
}

/* HERO DECORATION */

.cs-hero::before {
  content: '';
  position: absolute;
  inset: -40%;
  background:
    radial-gradient(circle at top left, var(--cs-glow-a), transparent 55%),
    radial-gradient(circle at top right, var(--cs-glow-b), transparent 55%);
  opacity: 0.7;
  pointer-events: none;
  z-index: -2;
}

.cs-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.06) 1px, transparent 1px);
  background-size: 80px 80px;
  opacity: 0.16;
  pointer-events: none;
  z-index: -1;
}

/* BUTTONS */

.cs-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  font-family: var(--cs-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    background 0.18s ease,
    color 0.18s ease,
    border-color 0.18s ease,
    transform 0.18s ease,
    box-shadow 0.18s ease;
}

.cs-btn-primary {
  background: linear-gradient(135deg, var(--cs-primary-strong), #4338ca);
  color: white;
  border-color: rgba(129, 140, 248, 0.9);
  box-shadow: 0 14px 30px rgba(79, 70, 229, 0.35);
}

.cs-btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 40px rgba(79, 70, 229, 0.45);
}

.cs-btn-ghost {
  background: transparent;
  color: var(--cs-text);
  border-color: rgba(148, 163, 184, 0.5);
}

.cs-btn-ghost:hover {
  background: rgba(15, 23, 42, 0.8);
  border-color: var(--cs-primary-strong);
}

.cs-btn-small {
  padding: 0.55rem 1.1rem;
  font-size: 0.72rem;
}

.cs-btn-disabled {
  opacity: 0.6;
  cursor: default;
  box-shadow: none;
}

/* CTA PULSE */

.cs-btn-pulse {
  position: relative;
}

.cs-btn-pulse::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: inherit;
  border: 1px solid rgba(79, 70, 229, 0.4);
  opacity: 0;
  transform: scale(0.9);
  animation: cs-pulse 2.4s ease-out infinite;
}

@keyframes cs-pulse {
  0% {
    opacity: 0;
    transform: scale(0.9);
  }
  40% {
    opacity: 0.8;
    transform: scale(1.08);
  }
  100% {
    opacity: 0;
    transform: scale(1.12);
  }
}

/* SECTIONS */

.cs-section {
  padding: var(--cs-space-12) var(--cs-space-4);
}

.cs-section-alt {
  background: radial-gradient(circle at top, var(--cs-bg-glow) 0, var(--cs-bg) 60%);
}

.cs-section-inner {
  max-width: 1080px;
  margin: 0 auto;
}

.cs-section-title {
  font-size: 1.6rem;
  margin: 0 0 var(--cs-space-2);
}

.cs-section-sub {
  margin: 0 0 var(--cs-space-6);
  max-width: 30rem;
  color: var(--cs-text-muted);
  font-size: 0.96rem;
}

/* GRIDS / CARDS */

.cs-grid {
  display: grid;
  gap: var(--cs-space-4);
}

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

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

.cs-card,
.cs-product {
  background: linear-gradient(145deg, rgba(15, 23, 42, 0.96), rgba(15, 23, 42, 0.85));
  border-radius: var(--cs-radius-lg);
  padding: var(--cs-space-6);
  border: 1px solid rgba(148, 163, 184, 0.35);
  box-shadow: var(--cs-shadow-soft);
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease,
    border-color 0.18s ease,
    background 0.18s ease;
  position: relative;
  overflow: hidden;
}

/* CARD MICROINTERACTIONS */

.cs-card::before,
.cs-product::before {
  content: '';
  position: absolute;
  inset-inline: -40%;
  top: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(129,140,248,0.9), transparent);
  opacity: 0;
  transition: opacity 0.2s ease-out;
}

.cs-card:hover::before,
.cs-product:hover::before {
  opacity: 1;
}

.cs-card:hover,
.cs-product:hover {
  transform: translateY(-4px) translateZ(0) scale(1.01);
  box-shadow: 0 22px 50px rgba(15, 23, 42, 0.9);
  border-color: rgba(129, 140, 248, 0.7);
}

.cs-card-title {
  font-size: 1.05rem;
  margin: 0 0 var(--cs-space-2);
}

.cs-card-body {
  margin: 0;
  color: var(--cs-text-muted);
  font-size: 0.94rem;
  line-height: 1.7;
}

/* PRODUCTS */

.cs-product-name {
  font-size: 1.1rem;
  margin: 0 0 var(--cs-space-2);
}

.cs-product-body {
  margin: 0 0 var(--cs-space-4);
  color: var(--cs-text-muted);
  font-size: 0.94rem;
  line-height: 1.7;
}

.cs-product-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cs-space-2);
  margin-bottom: var(--cs-space-4);
}

.cs-product-meta span {
  font-family: var(--cs-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  color: var(--cs-text-faint);
}

.cs-product-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cs-space-2);
}

.cs-product-empty {
  border-style: dashed;
  border-color: rgba(148, 163, 184, 0.5);
}

/* FOUNDER */

.cs-founder {
  display: flex;
  flex-direction: column;
  gap: var(--cs-space-6);
}

.cs-founder-card {
  display: flex;
  align-items: center;
  gap: var(--cs-space-6);
  padding: var(--cs-space-6);
  border-radius: var(--cs-radius-lg);
  border: 1px solid rgba(148, 163, 184, 0.4);
  background: radial-gradient(circle at top left, var(--cs-primary-soft), transparent 60%),
              radial-gradient(circle at bottom right, rgba(15,23,42,0.96), var(--cs-bg));
  box-shadow: var(--cs-shadow-soft);
}

.cs-founder-img {
  width: 104px;
  height: 104px;
  border-radius: 999px;
  object-fit: cover;
  border: 2px solid rgba(129,140,248,0.8);
  box-shadow: 0 0 0 4px rgba(15,23,42,0.9);
}

.cs-founder-info {
  max-width: 32rem;
}

.cs-founder-name {
  margin: 0 0 4px;
  font-size: 1.2rem;
}

.cs-founder-role {
  margin: 0 0 var(--cs-space-2);
  font-family: var(--cs-font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cs-text-faint);
}

.cs-founder-text {
  margin: 0;
  color: var(--cs-text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* CONTACT */

.cs-contact {
  display: flex;
  flex-direction: column;
  gap: var(--cs-space-8);
}

.cs-contact-grid {
  display: grid;
  gap: var(--cs-space-6);
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.cs-contact-heading {
  margin: 0 0 var(--cs-space-2);
  font-size: 1.02rem;
}

.cs-contact-text {
  margin: 0 0 var(--cs-space-2);
  color: var(--cs-text-muted);
  font-size: 0.94rem;
}

.cs-contact-link a {
  font-family: var(--cs-font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cs-primary-strong);
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(129, 140, 248, 0.7);
}

.cs-contact-link a:hover {
  border-bottom-color: var(--cs-accent);
}

/* FORM (if enabled later) */

.cs-contact-form {
  margin-top: var(--cs-space-4);
  max-width: 32rem;
  display: grid;
  gap: var(--cs-space-3);
}

.cs-field label {
  display: block;
  margin-bottom: 0.2rem;
  font-size: 0.8rem;
  color: var(--cs-text-muted);
}

.cs-field input,
.cs-field textarea {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border-radius: var(--cs-radius-md);
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: rgba(15, 23, 42, 0.9);
  color: var(--cs-text);
  font-family: var(--cs-font-body);
  font-size: 0.9rem;
}

.cs-field input:focus,
.cs-field textarea:focus {
  outline: none;
  border-color: var(--cs-primary-strong);
  box-shadow: 0 0 0 1px rgba(79, 70, 229, 0.5);
}

/* FOOTER */

.cs-footer {
  border-top: 1px solid rgba(148, 163, 184, 0.3);
  padding: var(--cs-space-4);
  margin-top: var(--cs-space-8);
  background: rgba(5, 6, 10, 0.96);
}

.cs-footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: var(--cs-space-2);
  align-items: center;
  justify-content: space-between;
  color: var(--cs-text-faint);
  font-size: 0.8rem;
}

/* RESPONSIVE */

@media (max-width: 640px) {
  .cs-nav-inner {
    padding-inline: var(--cs-space-3);
  }

  .cs-nav-links {
    display: none;
  }

  .cs-hamburger {
    display: inline-flex;
  }

  .cs-hero {
    padding-top: var(--cs-space-12);
  }

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

  .cs-founder-card {
    flex-direction: column;
    align-items: flex-start;
  }
}