:root {
  --bg: #ffffff;
  --surface: #f8fafc;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-muted: #64748b;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
header {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo {
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.logo::before {
  content: "";
  display: inline-block;
  width: 28px;
  height: 28px;
  background-image: url("/logo.svg");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
}

.logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  object-fit: contain;
}

.logo-text {
  font-weight: 600;
}

nav {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-link {
  color: var(--text-muted);
  font-size: 15px;
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--text);
}

.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 500;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
}

/* Hero */
.hero {
  padding: 80px 0;
  text-align: center;
}

.hero h1 {
  font-size: 56px;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero p {
  font-size: 20px;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 32px;
}

.hero-usps {
  list-style: none;
  padding: 0;
  margin: 8px auto 32px;
  max-width: 600px;
  text-align: left;
  font-size: 16px;
  color: var(--text-muted);
}

.hero-usps li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 6px;
}

.hero-usps li::before {
  content: "•";
  color: var(--accent);
  font-weight: 700;
  line-height: 1;
  margin-top: 2px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: #e2e8f0;
}

/* Features */
.features {
  padding: 80px 0;
  background: var(--surface);
}

.intro {
  padding: 40px 0;
}

.intro p {
  max-width: 720px;
  margin: 0 auto 16px;
  font-size: 17px;
  color: var(--text-muted);
}

.section-title {
  text-align: center;
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 48px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
}

.feature-card {
  background: var(--bg);
  padding: 32px;
  border-radius: 12px;
  border: 1px solid var(--border);
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 15px;
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  margin-top: 80px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-link {
  color: var(--text-muted);
  font-size: 14px;
}

.footer-link:hover {
  color: var(--text);
}

.copyright {
  color: var(--text-muted);
  font-size: 14px;
}

/* Language Selector */
.lang-selector {
  display: flex;
  gap: 8px;
  align-items: center;
}

.lang-select {
  padding: 6px 10px;
  border-radius: 4px;
  border: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-muted);
  background: var(--surface);
}

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

.lang-option {
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 13px;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
  text-transform: uppercase;
  font-weight: 500;
}

.lang-option:hover {
  color: var(--text);
  background: var(--surface);
}

.lang-option.active {
  color: var(--accent);
  background: var(--surface);
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 40px;
  }

  .hero p {
    font-size: 18px;
  }

  nav {
    gap: 16px;
  }

  .nav-link[href="#features"] {
    display: none;
  }

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

  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}

/* Volunteer Section */

.volunteer-section {
  background: #f8f9fa;
  padding: 80px 0;
  text-align: center;
}

.volunteer-card {
  background: white;
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  max-width: 600px;
  margin: 0 auto;
}

.btn-volunteer {
  background: #28a745;
  color: white;
  padding: 12px 30px;
  border-radius: 6px;
  text-decoration: none;
  display: inline-block;
  margin-top: 20px;
  font-weight: 600;
  transition: background 0.3s ease;
}

.btn-volunteer:hover {
  background: #218838;
}

.benefits-list {
  text-align: left;
  max-width: 720px;
  margin: 24px auto 24px;
}

.benefits-list h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 12px;
}

.benefits-list ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.benefits-list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 10px;
  font-size: 16px;
  color: var(--text-muted);
}

.benefits-list li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}