/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.86);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(11, 15, 25, 0.10);
}

.header-inner {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 20px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
}

.header-side {
    width: 180px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.header-side-right {
    justify-content: flex-end;
}

.header-brand {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: inherit;
}

.header-logo {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border-radius: 10px;
    font-size: 18px;
}

.header-title {
    font-weight: 900;
    font-size: 16px;
    letter-spacing: -0.02em;
}

.btn-header {
    border: 1px solid rgba(11, 15, 25, 0.10);
    background: transparent;
    color: #0b0f19;
    padding: 8px 14px;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 800;
    font-size: 13px;
    transition: background 0.15s ease, box-shadow 0.15s ease;
}

.btn-header:hover {
    background: rgba(11, 15, 25, 0.04);
}

.btn-header-primary {
    background: #111827;
    color: #ffffff;
    border-color: rgba(0, 0, 0, 0.12);
}

.btn-header-primary:hover {
    background: #1f2937;
}

/* ===== Header Responsive ===== */
@media (max-width: 520px) {
    .header-side {
        width: 100px;
    }

    .header-brand .header-title {
        display: none;
    }
}