/* ===== Reset & Base ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-primary: #1a73e8;
  --color-primary-dark: #1557b0;
  --color-primary-light: #e8f0fe;
  --color-bg: #f8f9fa;
  --color-white: #ffffff;
  --color-text: #202124;
  --color-text-secondary: #5f6368;
  --color-border: #dadce0;
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --max-width: 1100px;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 4px 14px rgba(0, 0, 0, 0.1);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-stack);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

/* ===== Header / Navigation ===== */
.site-header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0;
  padding-bottom: 0;
  height: 64px;
}

.logo {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.logo:hover {
  text-decoration: none;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
  text-decoration: none;
}

/* ===== Layout helpers ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

main {
  flex: 1;
}

/* ===== Hero Section ===== */
.hero {
  padding: 5rem 0 4rem;
  text-align: center;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  color: var(--color-text);
}

.hero h1 span {
  color: var(--color-primary);
}

.hero p {
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto 2rem;
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 0.8rem 2rem;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s, transform 0.1s;
  border: none;
  text-align: center;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-lg);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary-light);
}

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: 1.1rem;
}

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

/* ===== Features Section ===== */
.features {
  padding: 4rem 0;
}

.features h2 {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.features .subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  margin-bottom: 3rem;
  max-width: 550px;
  margin-left: auto;
  margin-right: auto;
}

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

.feature-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: box-shadow 0.2s, transform 0.2s;
}

.feature-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--color-primary-light);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  font-size: 1.5rem;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

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

/* ===== About / Info Section ===== */
.about {
  padding: 4rem 0;
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.about .container {
  max-width: 750px;
  text-align: center;
}

.about h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.about p {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  margin-bottom: 1rem;
}

/* ===== Download Page ===== */
.download-hero {
  padding: 4rem 0 2rem;
  text-align: center;
}

.download-hero h1 {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.download-hero p {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

.download-section {
  padding: 2rem 0 4rem;
}

.download-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 3rem;
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
  box-shadow: var(--shadow);
}

.download-card .app-name {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.download-card .app-company {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.download-card .btn {
  margin-bottom: 1.5rem;
}

.download-meta {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.download-meta-item {
  text-align: center;
}

.download-meta-item .label {
  display: block;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.2rem;
}

.download-meta-item .value {
  font-weight: 600;
  font-size: 0.95rem;
}

/* ===== Installation Instructions ===== */
.install-steps {
  padding: 2rem 0 4rem;
}

.install-steps h2 {
  text-align: center;
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 2rem;
}

.steps-list {
  max-width: 650px;
  margin: 0 auto;
  list-style: none;
  counter-reset: steps;
}

.steps-list li {
  counter-increment: steps;
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  margin-bottom: 1.5rem;
}

.steps-list li::before {
  content: counter(steps);
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
}

.steps-list li strong {
  display: block;
  margin-bottom: 0.15rem;
}

.steps-list li span {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

/* ===== Project Cards (Index page) ===== */
.projects {
  padding: 4rem 0;
}

.projects h2 {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.projects .subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  margin-bottom: 3rem;
  max-width: 550px;
  margin-left: auto;
  margin-right: auto;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.project-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  transition: box-shadow 0.2s, transform 0.2s;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.project-card h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.project-card .project-type {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 1rem;
}

.project-card p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  flex: 1;
}

/* ===== Coming Soon / Disabled Button ===== */
.btn-disabled {
  background: var(--color-border);
  color: var(--color-text-secondary);
  cursor: default;
  box-shadow: none;
}

.btn-disabled:hover {
  background: var(--color-border);
  transform: none;
  box-shadow: none;
}

.coming-soon-note {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-top: 0.75rem;
}

/* ===== Project Detail Hero ===== */
.project-hero {
  padding: 4rem 0 2rem;
  text-align: center;
}

.project-hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.project-hero .project-type {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 1rem;
}

.project-hero p {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  max-width: 650px;
  margin: 0 auto;
}

/* ===== CTA Section ===== */
.cta-section {
  padding: 3rem 0 4rem;
  text-align: center;
}

.cta-section .cta-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 3rem;
  max-width: 550px;
  margin: 0 auto;
  box-shadow: var(--shadow);
}

.cta-section .cta-card h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.cta-section .cta-card p {
  color: var(--color-text-secondary);
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  padding: 1rem 0 0;
  font-size: 0.9rem;
}

.breadcrumb a {
  color: var(--color-text-secondary);
}

.breadcrumb a:hover {
  color: var(--color-primary);
}

.breadcrumb .separator {
  color: var(--color-border);
  margin: 0 0.4rem;
}

.breadcrumb .current {
  color: var(--color-text);
  font-weight: 500;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero {
    padding: 3rem 0 2.5rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1.05rem;
  }

  .features {
    padding: 3rem 0;
  }

  .features h2 {
    font-size: 1.6rem;
  }

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

  .download-card {
    padding: 2rem 1.5rem;
  }

  .download-meta {
    gap: 1.25rem;
  }

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

  .project-hero h1 {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .nav-links {
    gap: 0.75rem;
    font-size: 0.85rem;
  }

  .hero h1 {
    font-size: 1.65rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn-lg {
    width: 100%;
  }

  .download-hero h1 {
    font-size: 1.75rem;
  }

  .project-hero h1 {
    font-size: 1.65rem;
  }

  .cta-section .cta-card {
    padding: 2rem 1.5rem;
  }
}