:root {
    --primary-color: #1a1a1a;
    --primary-hover: #000000;
    --dark-color: #000000;
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-300: #d4d4d4;
    --gray-400: #a3a3a3;
    --gray-500: #737373;
    --gray-600: #525252;
    --gray-700: #404040;
    --gray-800: #262626;
    --gray-900: #171717;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --border-radius: 0.5rem;
    --border-radius-lg: 0.75rem;
}

* {
    box-sizing: border-box;
}

body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background-color: var(--gray-50);
    color: var(--gray-900);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--dark-color);
}

.container-custom {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
}

.card-custom {
    background-color: #ffffff;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    overflow: hidden;
    transition: all 0.3s ease;
}

.card-custom:hover {
    box-shadow: var(--shadow-lg);
}

.btn-custom {
    font-weight: 500;
    padding: 0.625rem 1.25rem;
    border-radius: var(--border-radius);
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    line-height: 1.25rem;
}

.btn-primary-custom {
    background-color: var(--primary-color);
    color: #ffffff;
}

.btn-primary-custom:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-primary-custom:active {
    transform: translateY(0);
    box-shadow: none;
}

.btn-dark-custom {
    background-color: var(--gray-900);
    color: #ffffff;
}

.btn-dark-custom:hover {
    background-color: var(--gray-800);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-secondary-custom {
    background-color: #ffffff;
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-secondary-custom:hover {
    background-color: var(--gray-50);
    border-color: var(--gray-400);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.form-control-custom {
    padding: 0.625rem 0.875rem;
    font-size: 0.875rem;
    line-height: 1.25rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    background-color: #ffffff;
    transition: all 0.2s ease;
    width: 100%;
}

.form-control-custom:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-control-custom::placeholder {
    color: var(--gray-400);
}

.alert-custom {
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    font-size: 0.875rem;
    border: 1px solid transparent;
}

.alert-danger-custom {
    background-color: #fef2f2;
    color: #dc2626;
    border-color: #fecaca;
}

.alert-success-custom {
    background-color: #f0fdf4;
    color: #16a34a;
    border-color: #bbf7d0;
}

.text-muted-custom {
    color: var(--gray-500);
}

.min-vh-100 {
    min-height: 100vh;
}

.navbar-custom {
    background-color: #ffffff;
    border-bottom: 1px solid var(--gray-200);
    padding: 1rem 0;
    box-shadow: var(--shadow-sm);
}

@media (max-width: 768px) {
    .container-custom {
        padding: 0 16px;
    }

    .btn-custom {
        font-size: 0.8125rem;
        padding: 0.5rem 1rem;
    }
}