:root {
    --primary: #2563eb;
    --primary-light: #3b82f6;
    --primary-dark: #1e40af;
    --accent: #7c3aed;
    --light: #f8fafc;
    --dark: #1e293b;
    --gray: #94a3b8;
    --bg: #f1f5f9;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    color: var(--dark);
    line-height: 1.5;
    flex-direction: column;
}

/* Header */
.site-header {
    background-color: #1a252f;
    background: linear-gradient(135deg, #1a252f, #2c3e50);
    color: #ffffff;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    width: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: 'Orbitron', sans-serif;
    font-size: 1.8rem;
    font-weight: 700;
}

.logo img {
    height: 40px;
    margin-right: 10px;
    object-fit: cover;
    position: relative;
    top: 2px;
    filter: drop-shadow(0 0 3px rgb(255, 255, 255));
}

.logo a span {
    font-family: 'Poppins', sans-serif;
    font-size: 1.5rem;
    font-weight: bolder;
    background: linear-gradient(to right, #aa00ff, #0015ff, #1b9400, #ffae00, #ff0000, #ffae00, #1b9400, #0015ff, #aa00ff);
    background-size: 200%;
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: animate-gradient 2.5s linear infinite;
    position: relative;
    top: -3px;
}

@keyframes animate-gradient {
    to {
        background-position: 200%;
    }
}

.logo a {
    text-decoration: none;
    color: white;
}

.nav-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    margin-left: 20px;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-links a:hover {
    color: #ffffff;
}

nav a::after {
    content: "";
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--light);
    transition: width 0.3s ease;
}

nav a:hover::after {
    width: 100%;
}

@media (min-width: 350px) and (max-width:410px) {
    .nav-links a {
        margin: 0 0 0 10px;
    }

    .site-header {
        padding: 5px 10px;
    }
}

@media (min-width: 300px) and (max-width:375px) {
    .nav-links a {
        font-size: small;
        margin: 0 0 0 10px;
    }

    .logo {
        gap: 0;
    }

    .logo a span {
        font-size: 1.2rem;
    }

    .site-header {
        padding: 5px 10px;
    }
}


.calculator {
    width: 100%;
    max-width: 800px;
    background: white;
    border-radius: 1rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    margin-top: 30px;
}

header {
    background: var(--primary);
    padding: 1.5rem;
    text-align: center;
    color: white;
}

h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.input-section {
    padding: 1.5rem;
    border-bottom: 1px solid #e2e8f0;
}

.input-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--dark);
}

.input-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    align-items: center;
}

.input-controls label {
    font-weight: 500;
}

.input-controls select {
    padding: 0.5rem;
    border: 2px solid #e2e8f0;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
}

.input-controls select:focus {
    outline: none;
    border-color: var(--primary);
}

.input-fields {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.number-input {
    flex: 1;
    min-width: 160px;
    position: relative;
}

.number-input input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #e2e8f0;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.2s;
}

.number-input input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.number-input .clear-btn {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--gray);
    cursor: pointer;
}

.buttons {
    display: flex;
    gap: 1rem;
}

.btn {
    flex: 1;
    padding: 0.75rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
}

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

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

.btn-secondary {
    background: #e2e8f0;
    color: var(--dark);
}

.btn-secondary:hover {
    background: #cbd5e1;
}

.results {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    padding: 1.5rem;
}

.result-card {
    background: white;
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
}

.result-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.result-value {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    color: var(--primary);
    margin-top: 0.5rem;
}

.explanation {
    padding: 1.5rem;
    background: #f8fafc;
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 1rem;
}

.info-card {
    background: white;
    padding: 1rem;
    border-radius: 0.5rem;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

.info-card ul {
    padding-left: 15px;
}

footer {
    text-align: center;
    padding: 1rem;
    color: var(--gray);
    font-size: 0.875rem;
    border-top: 1px solid #e2e8f0;
}

@media (max-width: 768px) {

    .results,
    .info-grid {
        grid-template-columns: 1fr;
    }

    .buttons {
        flex-direction: column;
    }

    .input-controls {
        flex-direction: column;
        align-items: flex-start;
    }
}


.seo-section {
  max-width: 960px;
  margin: 40px auto;
  padding: 30px 20px;
  background: white;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  line-height: 1.8;
  font-size: 1rem;
  color: #212529;
}

.seo-section h2 {
  font-size: 1.8rem;
  color: #4361ee;
  margin-bottom: 20px;
  border-bottom: 2px solid #4361ee;
  padding-bottom: 10px;
}

.seo-section h3 {
  font-size: 1.4rem;
  margin-top: 30px;
  margin-bottom: 15px;
  color: #3f37c9;
}

.seo-section p {
  margin-bottom: 15px;
}

.seo-section ul {
  list-style: disc;
  padding-left: 20px;
  margin-bottom: 20px;
}

.seo-section ul li {
  margin-bottom: 10px;
}

.seo-section ol {
  list-style: decimal;
  padding-left: 20px;
  margin-bottom: 20px;
}

.seo-section ol li {
  margin-bottom: 10px;
}

.seo-section strong {
  color: #4361ee;
}

.seo-section a {
  color: #3f37c9;
  text-decoration: underline;
}

.seo-section a:hover {
  text-decoration: none;
}


footer {
    padding: 0 25px ;
}

footer p a {
    color: #1b9400;
    text-decoration: none;
    font-weight: bold;
}