.container {
    max-width: 1100px;
    margin: 0 auto;
    overflow: auto;
    padding: 0 40px;
}

.card {
    background-color: #fff;
    color: #1a202c;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    padding: 20px;
    margin: 10px;
}

.btn {
    display: inline-block;
    padding: 10px 28px;
    cursor: pointer;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    letter-spacing: 0.01em;
    transition: opacity 0.18s ease, transform 0.15s ease;
}

.btn-outline {
    background-color: transparent;
    border: 1.5px solid rgba(255,255,255,0.8);
    color: #fff;
}

.btn:hover {
    opacity: 0.87;
    transform: scale(0.98);
}

.bg-primary, .btn-primary { background-color: var(--primary-color); color: #fff; }
.bg-secondary, .btn-secondary { background-color: var(--secondary-color); color: #fff; }
.bg-dark, .btn-dark { background-color: var(--dark-color); color: #fff; }
.bg-light, .btn-light { background-color: var(--light-color); color: #333; }
.bg-white { background-color: #fff; }

.mt-3 { margin-top: 1.5rem; }

.bg-primary a, .btn-primary a,
.bg-secondary a, .btn-secondary a,
.bg-dark a, .btn-dark a,
.btn-light a { color: #fff; }

.text-primary   { color: var(--primary-color); }
.text-secondary { color: #6c757d; }
.text-dark      { color: var(--dark-color); }
.text-light     { color: var(--light-color); }

.lead {
    font-size: 1rem;
    font-weight: 400;
    color: rgba(255,255,255,0.82);
}

.sm  { font-size: 0.8rem; }
.md  { font-size: 1.5rem;   font-weight: 700; }
.lg  { font-size: 1.875rem; font-weight: 800; letter-spacing: -0.5px; }
.xl  { font-size: 2.25rem;  font-weight: 800; letter-spacing: -1px; }

.text-center { text-align: center; }

.alert {
    background-color: var(--light-color);
    padding: 12px 16px;
    font-size: 0.875rem;
    font-weight: 400;
    margin: 16px 0;
    border-radius: 6px;
    line-height: 1.5;
}

.alert i { margin-right: 8px; }

.alert-success { background-color: var(--success-color); color: #fff; }
.alert-error   { background-color: var(--error-color);   color: #fff; }

.flex {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
}

.grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    justify-content: center;
    align-items: center;
    height: 100%;
}

.grid-3 { grid-template-columns: repeat(3, 1fr); }

.my-1 { margin: 1rem 0; }
.my-2 { margin: 1.5rem 0; }
.my-3 { margin: 2rem 0; }
.my-4 { margin: 3rem 0; }
.my-5 { margin: 4rem 0; }

.m-1 { margin: 1rem; }
.m-2 { margin: 1.5rem; }
.m-3 { margin: 2rem; }
.m-4 { margin: 3rem; }
.m-5 { margin: 4rem; }

.py-1 { padding: 1rem 0; }
.py-2 { padding: 1.5rem 0; }
.py-3 { padding: 2rem 0; }
.py-4 { padding: 3rem 0; }
.py-5 { padding: 4rem 0; }

.p-1 { padding: 1rem; }
.p-2 { padding: 1.5rem; }
.p-3 { padding: 2rem; }
.p-4 { padding: 3rem; }
.p-5 { padding: 4rem; }