:root {
    --primary: #4361ee;
    --primary-dark: #3a56d4;
    --secondary: #06d6a0;
    --dark: #1e293b;
    --light: #f8fafc;
    --gray: #94a3b8;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --card-bg: rgba(255, 255, 255, 0.95);
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
    --transition: all 0.2s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    -webkit-tap-highlight-color: transparent;
}

body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    /* padding: 8px; */
    display: flex;
    flex-direction: column;
    color: var(--dark);
    line-height: 1.5;
    -webkit-text-size-adjust: 100%;
}

/* 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);
    margin-bottom: 10px;
    height: 55px;
}

.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: 5px;
    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;
    }
}



.page-container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 12px;
    max-width: 900px;
}

header {
    text-align: center;
    padding: 8px 0;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-bottom: 4px;
    font-size: clamp(1rem, 4vw, 1.4rem);
    font-weight: 700;
    color: white;
}

h1 {
    font-size: clamp(1.2rem, 5vw, 2rem);
    font-weight: 800;
    margin-bottom: 4px;
    background: linear-gradient(to right, #ffffff, #e0e7ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

.subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: clamp(0.75rem, 3vw, 1rem);
    max-width: 700px;
    margin: 0 auto;
}

.content-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    flex: 1;
}

@media (min-width: 768px) {
    .content-container {
        grid-template-columns: 1fr 1fr;
        gap: 16px;
    }
}

.card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 12px;
    transition: var(--transition);
    backdrop-filter: blur(8px);
}

.calculator-card {
    display: flex;
    flex-direction: column;
}

.input-group {
    margin-bottom: 10px;
}

label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    color: var(--dark);
    font-size: 0.9rem;
}

.input-container {
    position: relative;
}

input {
    width: 100%;
    padding: 12px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
    background: white;
    -webkit-appearance: none;
}

input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

.range-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 8px;
}

input[type="range"] {
    width: 100%;
    height: 8px;
    -webkit-appearance: none;
    background: #e2e8f0;
    border-radius: 8px;
    padding: 0;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
}

.value-display {
    width: 100%;
    padding: 8px;
    background: #e0e7ff;
    border-radius: 8px;
    text-align: center;
    font-weight: 700;
    color: var(--primary);
    font-size: 0.9rem;
}

.btn-calculate {
    background: var(--primary);
    color: white;
    border: none;
    padding: 14px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
}

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

.results-card {
    display: flex;
    flex-direction: column;
}

.results-header {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 12px;
}

h2 {
    font-size: 1.2rem;
    color: var(--dark);
    background: linear-gradient(to right, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 12px;
}

.result-card {
    background: white;
    border-radius: 8px;
    padding: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.result-label {
    font-size: 0.8rem;
    color: var(--gray);
    margin-bottom: 4px;
}

.result-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--dark);
}

.result-highlight {
    color: var(--success);
}

.chart-container {
    height: 220px;
    margin-top: 12px;
    position: relative;
    background: white;
    border-radius: 8px;
    padding: 8px;
}

.summary {
    background-color: #f8f9fa;
    border-left: 4px solid var(--primary);
    padding: 12px;
    margin-top: 12px;
    border-radius: 0 8px 8px 0;
    font-size: 0.8rem;
    line-height: 1.5;
}

.summary p {
    margin-bottom: 8px;
    display: flex;
    align-items: flex-start;
}

.summary i {
    color: var(--primary);
    margin-right: 6px;
    font-size: 1em;
    margin-top: 2px;
}

footer {
    text-align: center;
    margin-top: 16px;
    padding: 12px 0;
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.75rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Mobile-specific optimizations */
@media (max-width: 480px) {
    body {
        padding: 6px;
    }

    .page-container {
        gap: 10px;
    }

    .card {
        padding: 10px;
    }

    input {
        padding: 10px;
        font-size: 0.95rem;
    }

    .btn-calculate {
        padding: 12px;
        font-size: 0.95rem;
    }

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

    .chart-container {
        height: 200px;
    }

    input[type="range"]::-webkit-slider-thumb {
        width: 20px;
        height: 20px;
    }
}

/* Very small screens (320px and below) */
@media (max-width: 320px) {
    input {
        padding: 8px;
        font-size: 0.9rem;
    }

    .btn-calculate {
        padding: 10px;
        font-size: 0.9rem;
    }

    .result-value {
        font-size: 1rem;
    }

    .chart-container {
        height: 180px;
    }
}

footer p a {
    font-weight: bold;
    text-decoration: none;
    color: #ff9500;
}

.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;
  margin-bottom: 0;
}

.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;
}