/* --- Design System Tokens --- */
:root {
  --font-primary: "Plus Jakarta Sans", sans-serif;

  /* Light Mode Palette */
  --bg-main: #ffffff;
  --bg-nav: rgba(255, 255, 255, 0.9);
  --bg-alt: rgba(248, 250, 252, 0.7);
  /* slate-50/70 */
  --bg-card: rgba(241, 245, 249, 0.4);
  /* slate-100/40 */
  --text-main: #0f172a;
  /* slate-900 */
  --text-muted: #64748b;
  /* slate-500 */
  --text-dim: #94a3b8;
  /* slate-400 */
  --border-color: transparent;
  --border-nav-scrolled: #f1f5f9;
  /* slate-100 */
  --selection-bg: #e2e8f0;
  /* slate-200 */

  /* Inverted Core Dark Sections (Always Dark) */
  --bg-always-dark: #0f172a;
  /* slate-900 */
  --bg-always-dark-card: rgba(30, 41, 59, 0.4);
  /* slate-800/40 */
  --border-always-dark: #1e293b;
  /* slate-800 */
  --text-always-dark-muted: #94a3b8;
  /* slate-400 */
  --text-always-dark-dim: #64748b;
  /* slate-500 */

  --accent-purple: #7c3aed;  /* Tailwind Violet-600 */
  --accent-green: #16a34a;   /* Tailwind Green-600 */
}

html.dark {
  /* Dark Mode Palette */
  --bg-main: #020617;
  /* slate-950 */
  --bg-nav: rgba(2, 6, 23, 0.9);
  --bg-alt: rgba(15, 23, 42, 0.3);
  /* slate-900/30 */
  --bg-card: rgba(15, 23, 42, 0.2);
  /* slate-900/20 */
  --text-main: #f8fafc;
  /* slate-100 */
  --text-muted: #94a3b8;
  /* slate-400 */
  --text-dim: #64748b;
  /* slate-500 */
  --border-color: transparent;
  --border-nav-scrolled: #1e293b;
  /* slate-800 */
  --selection-bg: #1e293b;
  /* slate-800 */

  /* Section 4 & 5 Overrides in Dark Mode */
  --bg-always-dark: rgba(15, 23, 42, 0.5);
  /* slate-900/50 */

  --accent-purple: #c084fc;  /* Tailwind Purple-400 */
  --accent-green: #4ade80;   /* Tailwind Green-400 */
}

/* --- Base Framework Styles --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html.scroll-smooth {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  letter-spacing: -0.012em;
  background-color: var(--bg-main);
  color: var(--text-main);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition:
    background-color 0.2s ease,
    color 0.2s ease;
}

::selection {
  background-color: var(--selection-bg);
  color: var(--text-main);
}

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

button {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  color: inherit;
  border-radius: 0.25rem !important;
}

/* --- Layout Grid Systems --- */
.container {
  width: 100%;
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .grid-products {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 768px) {
  .grid-12 {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 3rem;
  }

  .col-4 {
    grid-column: span 4 / span 4;
  }

  .col-8 {
    grid-column: span 8 / span 8;
  }

  .grid-inner-capabilities {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 3rem;
  }

  .grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
  }
}

/* --- Component Modules --- */

/* Navigation Bar */
nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 50;
  background-color: var(--bg-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  transition: all 0.3s ease;
}

@media (min-width: 768px) {
  nav {
    padding: 1.5rem 0;
  }
}

nav.scrolled {
  padding: 0.75rem 0;
  border-bottom-color: var(--border-nav-scrolled);
  background-color: var(--bg-main);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.logo-square {
  height: 1rem;
  width: 1rem;
  background-color: var(--text-main);
  border-radius: 0.125rem;
}

.nav-links {
  display: none;
  align-items: center;
  gap: 2rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  tracking-letter: 0.05em;
  letter-spacing: 0.05em;
  font-weight: 600;
  color: var(--text-muted);
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

.nav-links a:hover {
  color: var(--text-main);
  transition: color 0.2s ease;
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-btn {
  color: var(--text-muted);
  font-size: 0.875rem;
  padding: 0.25rem;
  transition: color 0.2s ease;
}

.theme-btn:hover {
  color: var(--text-main);
}

html.dark .fa-sun {
  display: inline-block !important;
}

html.dark .fa-moon {
  display: none !important;
}

html:not(.dark) .fa-sun {
  display: none !important;
}

html:not(.dark) .fa-moon {
  display: inline-block !important;
}

.mobile-menu-btn {
  display: block;
  color: var(--text-muted);
  font-size: 1.125rem;
}

.mobile-menu-btn:hover {
  color: var(--text-main);
}

@media (min-width: 768px) {
  .mobile-menu-btn {
    display: none;
  }
}

/* Mobile Drawer Menu */
.mobile-drawer {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background-color: var(--bg-main);
  border-bottom: 1px solid var(--border-nav-scrolled);
  padding: 1.5rem;
  flex-direction: column;
  gap: 1rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
  color: var(--text-muted);
}

.mobile-drawer.active {
  display: flex;
}

.mobile-drawer a:hover {
  color: var(--text-main);
}

/* Hero Section */
.hero-section {
  padding-top: 9rem;
  padding-bottom: 4rem;
}

@media (min-width: 768px) {
  .hero-section {
    padding-top: 13rem;
    padding-bottom: 8rem;
  }
}

.hero-content {
  max-width: 56rem;
}

.hero-content > * + * {
  margin-top: 1.5rem;
}

@media (min-width: 768px) {
  .hero-content > * + * {
    margin-top: 2rem;
  }
}

.hero-title {
  font-size: 1.875rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.2;
  color: var(--text-main);
}

@media (min-width: 640px) {
  .hero-title {
    font-size: 3rem;
  }
}

@media (min-width: 1024px) {
  .hero-title {
    font-size: 3.75rem;
    line-height: 1.15;
  }
}

.hero-desc {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 42rem;
  line-height: 1.625;
  font-weight: 400;
}

@media (min-width: 640px) {
  .hero-desc {
    font-size: 1.125rem;
  }
}

.btn-primary {
  display: inline-block;
  width: 100%;
  text-align: center;
  padding: 0.875rem 1.5rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  background-color: #0f172a;
  color: #ffffff;
  transition: background-color 0.2s ease;
}

html.dark .btn-primary {
  background-color: #ffffff;
  color: #020617;
}

.btn-primary:hover {
  background-color: #1e293b;
}

html.dark .btn-primary:hover {
  background-color: #f1f5f9;
}

@media (min-width: 640px) {
  .btn-primary {
    width: auto;
  }
}

/* Dynamic sliding text system */
.hero-desc-dynamic {
  height: 4.5rem; /* Reserves desktop height to prevent layout shifting */
  overflow: hidden;
  position: relative;
}

@media (max-width: 640px) {
  .hero-desc-dynamic {
    height: 6rem; /* Slightly taller for smaller screen wrapping */
  }
}

.hero-desc-dynamic .hero-desc {
  position: absolute;
  top: 20px;
  left: 0;
  opacity: 0;
  margin: 0;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.6s ease;
  transform: translateY(100%);
  pointer-events: none;
  font-size: 1.5rem;
}

/* State when the text line becomes active */
.hero-desc-dynamic .hero-desc.visible {
  opacity: 1;
  transform: translateY(0);
  position: relative;
  top: 0;
  pointer-events: auto;
}

/* State right before exiting upward */
.hero-desc-dynamic .hero-desc.exit {
  opacity: 0;
  transform: translateY(-100%);
}

.hero-desc.text-purple {
  color: var(--accent-purple);
  font-weight: 500; /* Adding a tiny bit of weight keeps colors readable */
}

.hero-desc.text-green {
  color: var(--accent-green);
  font-weight: 500;
}

/* Social Proof Section */
.social-section {
  padding: 3rem 0;
  background-color: var(--bg-alt);
  border-top: 1px solid var(--border-nav-scrolled);
  border-bottom: 1px solid var(--border-nav-scrolled);
}

.social-title {
  text-align: center;
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 2rem;
}

@media (min-width: 768px) {
  .social-title {
    font-size: 0.75rem;
  }
}

.social-grid {
  align-items: center;
  justify-content: center;
  gap: 2rem;
  opacity: 0.4;
  color: var(--text-main);
}

html.dark .social-grid {
  opacity: 0.6;
}

@media (min-width: 768px) {
  .social-grid {
    gap: 4rem;
  }
}

.social-brand {
  text-align: center;
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

@media (min-width: 768px) {
  .social-brand {
    font-size: 1.25rem;
  }
}

.social-brand i {
  margin-right: 0.5rem;
}

/* Core Capabilities Section (Inverted Layout) */
.capabilities-section {
  padding: 5rem 0;
  background-color: var(--bg-always-dark);
  color: #ffffff;
  border-bottom: 1px solid #020617;
}

@media (min-width: 768px) {
  .capabilities-section {
    padding: 7rem 0;
  }
}

.section-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-always-dark-muted);
  margin-bottom: 2.5rem;
}

html.dark .section-label-light {
  color: var(--text-muted);
}

.capability-item > * + * {
  margin-top: 0.5rem;
}

@media (max-width: 767px) {
  .grid-inner-capabilities > * + * {
    margin-top: 3rem;
  }
}

.capability-title {
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
}

.capability-desc {
  color: var(--text-always-dark-muted);
  font-size: 0.875rem;
  line-height: 1.625;
}

/* Products Section */
.products-section {
  padding: 5rem 0;
  border-bottom: 1px solid var(--border-nav-scrolled);
}

@media (min-width: 768px) {
  .products-section {
    padding: 7rem 0;
  }
}

.products-container {
  max-width: 56rem;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

@media (min-width: 768px) {
  .section-header {
    margin-bottom: 5rem;
  }
}

.section-subtitle {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.section-main-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-main);
}

@media (min-width: 768px) {
  .section-main-title {
    font-size: 1.875rem;
  }
}

.products-grid {
  display: grid;
  grid-template-columns: 1fr;
  border-collapse: collapse;
}

.product-card {
  padding: 2rem;
  text-align: center;
  border-bottom: 1px solid #e2e8f0;
  transition: background-color 0.3s ease;
}

html.dark .product-card {
  border-bottom-color: #1e293b;
}

@media (min-width: 640px) {
  .products-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .product-card:nth-child(odd) {
    border-right: 1px solid #e2e8f0;
  }

  html.dark .product-card:nth-child(odd) {
    border-right-color: #1e293b;
  }

  .product-card:nth-child(3),
  .product-card:nth-child(4) {
    border-bottom: none;
  }
}

@media (min-width: 768px) {
  .product-card {
    padding: 3rem;
  }
}

.product-card:hover {
  background-color: var(--bg-card);
}

.product-icon {
  color: #cbd5e1;
  margin-bottom: 1rem;
  font-size: 1.25rem;
  transition: color 0.3s ease;
}

html.dark .product-icon {
  color: #334155;
}

.product-card:hover .product-icon {
  color: var(--text-main);
}

.product-name {
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.product-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  max-width: 20rem;
  margin: 0 auto;
  line-height: 1.625;
}

/* Production Tech Stack Section */
.stack-section {
  padding: 5rem 0;
  background-color: var(--bg-always-dark);
  border-bottom: 1px solid #020617;
}

@media (min-width: 768px) {
  .stack-section {
    padding: 7rem 0;
  }
}

.stack-header {
  max-width: 42rem;
  margin-bottom: 3rem;
}

@media (min-width: 768px) {
  .stack-header {
    margin-bottom: 4rem;
  }
}

.stack-card {
  background-color: var(--bg-always-dark-card);
  border: 1px solid var(--border-always-dark);
  padding: 1.5rem;
  border-radius: 0.125rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

@media (min-width: 768px) {
  .stack-card {
    padding: 2rem;
  }
}

@media (max-width: 767px) {
  .grid-3 > * + * {
    margin-top: 1.5rem;
  }
}

.card-label {
  display: block;
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-always-dark-dim);
  margin-bottom: 1.5rem;
}

.stack-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.stack-item-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: #ffffff;
  display: block;
}

.stack-item-desc {
  font-size: 0.75rem;
  color: var(--text-always-dark-muted);
}

.stack-divider {
  border-top: 1px solid var(--border-always-dark);
  padding-top: 1rem;
}

/* Principles / Approach Section */
.principles-section {
  padding: 5rem 0;
  border-bottom: 1px solid var(--border-nav-scrolled);
}

@media (min-width: 768px) {
  .principles-section {
    padding: 7rem 0;
  }
}

.principles-list {
  display: flex;
  flex-direction: column;
  gap: 3rem;
  list-style: none;
}

.principle-item {
  display: flex;
  align-items: start;
  gap: 1rem;
}

@media (min-width: 768px) {
  .principle-item {
    gap: 1.5rem;
  }
}

.principle-num {
  font-size: 0.75rem;
  font-family: monospace;
  color: #cbd5e1;
  padding-top: 0.25rem;
}

html.dark .principle-num {
  color: #334155;
}

.principle-heading {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.principle-desc {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.625;
  max-width: 36rem;
}

/* Contact / CTA Section */
.contact-section {
  padding: 6rem 0;
  background-color: var(--bg-always-dark);
  color: #ffffff;
  text-align: center;
}

@media (min-width: 768px) {
  .contact-section {
    padding: 8rem 0;
  }
}

.contact-container {
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: #ffffff;
}

@media (min-width: 640px) {
  .contact-title {
    font-size: 2.25rem;
  }
}

.contact-desc {
  color: var(--text-always-dark-muted);
  font-size: 0.875rem;
  max-width: 32rem;
  margin: 0 auto;
  line-height: 1.625;
}

.btn-email {
  display: inline-block;
  width: 100%;
  padding: 0.875rem 2rem;
  border: 1px solid #ffffff;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  color: #ffffff;
  transition: all 0.2s ease;
  margin-top: 1rem;
}

.btn-email:hover {
  background-color: #ffffff;
  color: #0f172a;
}

html.dark .btn-email:hover {
  color: #020617;
}

@media (min-width: 640px) {
  .btn-email {
    width: auto;
  }
}

/* Copy Badge Layout & Animation */
.email-action-wrapper {
  position: relative;
  display: inline-block;
}

.copy-success-badge {
  position: absolute;
  bottom: -45px; /* Positions it nicely below the email button */
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  color: #ffffff;
  padding: 0.5rem 0.85rem;
  border-radius: 6px;
  font-family: var(--font-primary), sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
  z-index: 10;
}

/* Green icon adjustment inside badge */
.copy-success-badge i {
  color: #4ade80; /* Matches your green branding token */
  margin-right: 0.35rem;
}

/* Visibility Trigger State */
.copy-success-badge.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Footer */
footer {
  background-color: var(--bg-main);
  border-top: 1px solid var(--border-nav-scrolled);
  padding: 3rem 0;
  font-size: 0.75rem;
  color: var(--text-dim);
}

.footer-container {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .footer-container {
    flex-direction: row;
    gap: 0;
  }
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-main);
  font-weight: 700;
}

.footer-logo-square {
  height: 0.75rem;
  width: 0.75rem;
  background-color: var(--text-main);
  border-radius: 0.125rem;
}