:root {
  --bg-dark: #090a0f;
  --bg-card: #11131c;
  --bg-input: #181b28;
  --border-color: #272a3e;
  --primary: #ff2b42;
  --primary-hover: #e01b31;
  --primary-glow: rgba(255, 43, 66, 0.35);
  --accent: #ff5e71;
  --text-main: #f0f2fa;
  --text-muted: #8c92a4;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Navbar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 50px;
  background: rgba(17, 19, 28, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: #fff;
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: 1px;
}

.nav-logo {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  border: 1px solid var(--primary);
  box-shadow: 0 0 12px var(--primary-glow);
  object-fit: cover;
}

.nav-links {
  display: flex;
  gap: 25px;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all 0.2s;
}

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

.btn-nav-admin {
  background: transparent;
  border: 1px solid var(--primary);
  color: var(--accent) !important;
  padding: 8px 18px;
  border-radius: 8px;
  transition: all 0.25s !important;
}

.btn-nav-admin:hover {
  background: var(--primary) !important;
  color: #fff !important;
  box-shadow: 0 0 15px var(--primary-glow);
}

/* Hero Section */
.hero {
  padding: 80px 20px 60px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 10%;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255, 43, 66, 0.15) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(255, 43, 66, 0.12);
  border: 1px solid var(--primary);
  color: var(--accent);
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 25px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-title span {
  color: var(--primary);
  text-shadow: 0 0 30px var(--primary-glow);
}

.hero-desc {
  max-width: 650px;
  color: var(--text-muted);
  font-size: 1.15rem;
  line-height: 1.6;
  margin-bottom: 35px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  margin-bottom: 50px;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 14px 34px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  cursor: pointer;
  box-shadow: 0 4px 20px var(--primary-glow);
  transition: all 0.25s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(255, 43, 66, 0.5);
}

.btn-secondary {
  background: var(--bg-card);
  color: #fff;
  border: 1px solid var(--border-color);
  padding: 14px 30px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.25s;
}

.btn-secondary:hover {
  border-color: var(--primary);
  background: var(--bg-input);
}

/* Feature Cards */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
  max-width: 1100px;
  margin: 0 auto 80px;
  padding: 0 20px;
  width: 100%;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 30px 25px;
  transition: all 0.3s;
  text-align: left;
}

.feature-card:hover {
  border-color: var(--primary);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.feature-icon {
  width: 50px;
  height: 50px;
  background: rgba(255, 43, 66, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1.6rem;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* Key Checker Section */
.key-checker-section {
  max-width: 650px;
  margin: 0 auto 80px;
  padding: 35px 30px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  width: 90%;
  box-shadow: 0 15px 40px rgba(0,0,0,0.4);
}

.checker-title {
  font-size: 1.5rem;
  margin-bottom: 8px;
  text-align: center;
}

.checker-subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 25px;
  text-align: center;
}

.checker-form {
  display: flex;
  gap: 12px;
}

.checker-input {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  padding: 13px 18px;
  border-radius: 10px;
  color: #fff;
  font-size: 1rem;
  letter-spacing: 1px;
}

.checker-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 12px var(--primary-glow);
}

.checker-result {
  margin-top: 20px;
  padding: 16px;
  border-radius: 10px;
  display: none;
  font-size: 0.95rem;
  line-height: 1.6;
}

.checker-result.success {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid var(--success);
  color: #a7f3d0;
}

.checker-result.error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--danger);
  color: #fca5a5;
}

/* Footer */
footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  padding: 25px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}