:root {
    --black: #000000;
    --dark-gray: #1a1a1a;
    --gray: #333333;
    --light-gray: #666666;
    --lighter-gray: #999999;
    --white: #ffffff;
    --off-white: #f5f5f5;
    --border-gray: #e0e0e0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background-color: var(--white);
    color: var(--black);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
   
}

/* Bootstrap Customization - Black & White Theme */
.navbar-dark {
    background-color: var(--black) !important;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.navbar-dark .navbar-brand {
    color: var(--white) !important;
    font-size: 24px;
    font-weight: 700;
}

.navbar-dark .navbar-nav .nav-link {
    color: var(--white) !important;
    font-weight: 500;
    transition: opacity 0.3s;
}

.navbar-dark .navbar-nav .nav-link:hover {
    opacity: 0.8;
}

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

.btn-primary:hover {
    background-color: var(--gray);
    border-color: var(--gray);
}

.btn-outline-primary {
    color: var(--black);
    border-color: var(--black);
}

.btn-outline-primary:hover {
    background-color: var(--black);
    border-color: var(--black);
    color: var(--white);
}

.form-control:focus {
    border-color: var(--black);
    box-shadow: 0 0 0 0.25rem rgba(0, 0, 0, 0.25);
}

.form-select:focus {
    border-color: var(--black);
    box-shadow: 0 0 0 0.25rem rgba(0, 0, 0, 0.25);
}

/* Main Content */
main {
    flex: 1;
    padding: 40px 0;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--black);
    font-weight: 600;
}

/* Cards */
.card {
    border: 1px solid var(--border-gray);
    border-radius: 8px;
    transition: all 0.3s;
}

.card:hover {
    border-color: var(--black);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.card-body {
    padding: 1.5rem;
}


/* Results */
pre {
    background-color: var(--off-white);
    border: 1px solid var(--border-gray);
    border-radius: 6px;
    padding: 15px;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    color: var(--black);
}

code {
    background-color: var(--off-white);
    color: var(--black);
}

/* Loading */
.loading {
    text-align: center;
    padding: 20px;
    color: var(--light-gray);
}

/* Error */
.error {
    background-color: var(--off-white);
    border: 1px solid var(--border-gray);
    border-left: 4px solid var(--black);
    border-radius: 6px;
    padding: 15px;
    margin: 20px 0;
    color: var(--black);
}

/* Alert customization */
.alert {
    border-radius: 6px;
}

.alert-dark {
    background-color: var(--off-white);
    border-color: var(--border-gray);
    color: var(--black);
    border-left: 4px solid var(--black);
}

/* Loading spinner */
.spinner-border {
    color: var(--black);
}