:root {
  color-scheme: light dark;

  --surface: #fff8ee;
  --surface-container: #f6eedf;
  --surface-container-high: #ece2d0;
  --on-surface: #1f1a12;
  --on-surface-variant: #584e3e;
  --outline: #867b69;
  --outline-variant: #d8cdb9;

  --primary: #7f5300;
  --on-primary: #ffffff;
  --primary-container: #ffdea6;
  --on-primary-container: #2b1900;

  --secondary: #3a4ba8;
  --on-secondary: #ffffff;
  --secondary-container: #dde1ff;
  --on-secondary-container: #0e1a5c;

  --correct: #2c6a2c;
  --on-correct: #ffffff;
  --correct-container: #c4edbe;
  --on-correct-container: #062a08;

  --error: #b02338;
  --on-error: #ffffff;
  --error-container: #ffdadc;
  --on-error-container: #40000c;

  --font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, "Noto Sans Tamil", "Tamil Sangam MN", sans-serif;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  --max-width: 1040px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --surface: #17130d;
    --surface-container: #221d16;
    --surface-container-high: #2d2820;
    --on-surface: #f1e9db;
    --on-surface-variant: #c3b8a4;
    --outline: #8d836f;
    --outline-variant: #3f392e;

    --primary: #ffb930;
    --on-primary: #2a1800;
    --primary-container: #5f4000;
    --on-primary-container: #ffdea6;

    --secondary: #b2bcff;
    --on-secondary: #142271;
    --secondary-container: #2b3a8f;
    --on-secondary-container: #dde1ff;

    --correct: #80d67a;
    --on-correct: #00210a;
    --correct-container: #1b4a1d;
    --on-correct-container: #c4edbe;

    --error: #ff6e80;
    --on-error: #33000a;
    --error-container: #5e1223;
    --on-error-container: #ffd9dd;
  }
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-family: var(--font-family);
  background-color: var(--surface);
  color: var(--on-surface);
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
}

header {
  border-bottom: 1px solid var(--outline-variant);
  background-color: var(--surface-container);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--on-surface);
}

.brand img {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
}

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

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.brand-tamil {
  font-size: 0.875rem;
  color: var(--on-surface-variant);
  font-weight: 500;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--on-surface-variant);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.35rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--on-surface);
}

main {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
  width: 100%;
}

.hero {
  text-align: center;
  padding: 3rem 1rem 3.5rem;
  max-width: 780px;
  margin: 0 auto;
}

.badge-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--primary-container);
  color: var(--on-primary-container);
  font-size: 0.875rem;
  font-weight: 700;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.5rem;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: currentColor;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2.5vw, 1.25rem);
  color: var(--on-surface-variant);
  margin-bottom: 2rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius-full);
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: transform 0.15s ease, filter 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.05);
}

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

.btn-secondary {
  background-color: var(--surface-container-high);
  color: var(--on-surface);
  border: 1px solid var(--outline);
}

.section-title {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 0.75rem;
  text-align: center;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--on-surface-variant);
  text-align: center;
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.features {
  margin: 3.5rem 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background-color: var(--surface-container);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.feature-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.keycap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  font-size: 1.5rem;
  font-weight: 800;
  box-shadow: 0 3px 0 rgba(0, 0, 0, 0.15);
  user-select: none;
}

.keycap-uyir {
  background-color: var(--primary-container);
  color: var(--on-primary-container);
  border: 1px solid var(--primary);
}

.keycap-mei {
  background-color: var(--secondary-container);
  color: var(--on-secondary-container);
  border: 1px solid var(--secondary);
}

.keycap-uyirmei {
  background-color: var(--surface-container-high);
  color: var(--on-surface);
  border: 1px solid var(--outline);
}

.feature-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
}

.feature-card p {
  color: var(--on-surface-variant);
  font-size: 0.95rem;
  line-height: 1.55;
}

.gallery-section {
  margin: 4rem 0;
  text-align: center;
}

.screenshots-scroll {
  display: flex;
  gap: 1.25rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 1rem 0.5rem 1.5rem;
  -webkit-overflow-scrolling: touch;
}

.screenshot-item {
  flex: 0 0 auto;
  scroll-snap-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  width: 260px;
}

.screenshot-item img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  border: 1px solid var(--outline-variant);
}

.screenshot-caption {
  font-size: 0.875rem;
  color: var(--on-surface-variant);
  font-weight: 600;
}

.platforms-section {
  margin: 4rem 0;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.platform-card {
  background-color: var(--surface-container);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.5rem;
}

.platform-card h3 {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.platform-badge {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.platform-badge-active {
  background-color: var(--correct-container);
  color: var(--on-correct-container);
}

.platform-badge-soon {
  background-color: var(--surface-container-high);
  color: var(--on-surface-variant);
}

.form-section {
  margin: 4rem auto;
  max-width: 620px;
  background-color: var(--surface-container);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem;
}

.form-group {
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

label {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--on-surface);
}

.form-hint {
  font-size: 0.825rem;
  color: var(--on-surface-variant);
}

input[type="email"],
input[type="text"],
textarea {
  font-family: inherit;
  font-size: 1rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--outline);
  background-color: var(--surface);
  color: var(--on-surface);
  width: 100%;
}

textarea {
  min-height: 120px;
  resize: vertical;
}

input:focus,
textarea:focus {
  outline: 2px solid var(--primary);
  border-color: var(--primary);
}

.form-status {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.925rem;
  font-weight: 600;
  margin-top: 1rem;
  display: none;
}

.form-status.success {
  display: block;
  background-color: var(--correct-container);
  color: var(--on-correct-container);
  border: 1px solid var(--correct);
}

.form-status.error {
  display: block;
  background-color: var(--error-container);
  color: var(--on-error-container);
  border: 1px solid var(--error);
}

footer {
  border-top: 1px solid var(--outline-variant);
  background-color: var(--surface-container);
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: var(--on-surface-variant);
  font-size: 0.9rem;
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  list-style: none;
}

.footer-legal {
  font-size: 0.8rem;
  color: var(--on-surface-variant);
  opacity: 0.85;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .btn {
    transition: none;
  }
}

@media (max-width: 640px) {
  .nav-container {
    flex-direction: column;
    align-items: flex-start;
  }
  .nav-links {
    width: 100%;
    justify-content: flex-start;
  }
  .hero {
    padding: 2rem 0;
  }
  .form-section {
    padding: 1.75rem 1.25rem;
  }
}