:root {
    --primary: #4361ee;
    --secondary: #3a0ca3;
    --accent: #4895ef;
    --light: #f8f9fa;
    --dark: #212529;
    --gray: #6c757d;
    --success: #4cc9f0;
    --warning: #f72585;
    --border-radius: 12px;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f7ff;
    color: var(--dark);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

.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: #ffffff;
    transition: width 0.3s ease;
}

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

@media (min-width: 350px) and (max-width:390px) {
    .nav-links a {
        margin: 0 0 0 10px;
    }

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

@media (min-width: 300px) and (max-width:350px) {
    .nav-links a {
        font-size: small;
        margin: 0 0 0 10px;
    }

    .logo {
        gap: 0;
    }

    .logo a span {
        font-size: 1.2rem;
        position: relative;
        top: -5px;
    }

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



.top-section {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 2rem 1rem;
    text-align: center;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.main-container {
    flex: 1;
    max-width: 1200px;
    width: 95%;
    margin: 0 auto 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

@media (max-width: 900px) {
    .main-container {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
}

.bottom-section {
    background: linear-gradient(135deg, var(--secondary), var(--primary));
    color: white;
    padding: 1.5rem;
    text-align: center;
    margin-top: auto;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

h2 {
    color: var(--primary);
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

h3 {
    color: var(--secondary);
    margin: 1.5rem 0 1rem;
    font-size: 1.4rem;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

.input-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--dark);
}

textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    font-size: 1rem;
    min-height: 120px;
    resize: vertical;
    transition: var(--transition);
}

textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(72, 149, 239, 0.2);
}

.input-hint {
    font-size: 0.85rem;
    color: var(--gray);
    margin-top: 0.5rem;
}

.btn {
    padding: 0.8rem 1.5rem;
    border-radius: var(--border-radius);
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

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

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

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin: 1.5rem 0;
}

.sample-btns {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
    margin: 1rem 0;
}

.sample-btn {
    background: rgba(67, 97, 238, 0.1);
    border: 1px dashed var(--primary);
    color: var(--primary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
}

.sample-btn:hover {
    background: rgba(67, 97, 238, 0.2);
}

.results {
    background: linear-gradient(135deg, #f0f7ff, #e3eeff);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-top: 1.5rem;
    border-left: 5px solid var(--primary);
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.result-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.2rem;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.result-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
    margin: 0.5rem 0;
}

.result-label {
    color: var(--gray);
    font-size: 0.9rem;
}

.formula {
    background: rgba(67, 97, 238, 0.1);
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem 0;
    font-family: 'Cambria Math', serif;
    font-size: 1.1rem;
    border-left: 3px solid var(--primary);
}

.step {
    background: rgba(72, 149, 239, 0.05);
    border-radius: var(--border-radius);
    padding: 1.2rem;
    margin-bottom: 1rem;
    border-left: 4px solid var(--accent);
}

.step-title {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--secondary);
}

.calculation-steps {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-top: 1.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    max-height: 1230px;
    overflow-y: auto;
}

.step-item {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #eee;
}

.step-details {
    background: #f8f9fa;
    padding: 0.8rem;
    border-radius: 6px;
    margin-top: 0.5rem;
    font-family: monospace;
    white-space: pre-wrap;
    overflow-x: auto;
}

.data-points {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin: 1rem 0;
}

.data-point {
    background: rgba(67, 97, 238, 0.1);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
}

.highlight {
    background: rgba(72, 149, 239, 0.2);
    padding: 0 0.2rem;
    border-radius: 3px;
    font-weight: 600;
}

/* Responsive adjustments */
@media (max-width: 600px) {
    .panel {
        padding: 1.5rem;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .btn-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}

footer {
    margin: 20px;
    text-align: center;
}

footer p a {
    text-decoration: none;
    font-weight: bold;
    color: #3a0ca3;
}

.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;
}