/* ==========================================================================
   FOOTER COMPONENT STYLES
   ========================================================================== */

/* Reset & Scope */
.footer * {
    box-sizing: border-box;
}

.footer {
    display: block;
    width: 100%;
    background-color: var(--navy-bg);
    color: var(--text-muted);
    padding: 60px 0 24px;
    border-top: 1px solid var(--border-color);
    line-height: 1.5;
}

/* Layout Grid Container */
.footer__container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 32px;
    display: grid;
    grid-template-columns: 2fr repeat(4, 1fr);
    gap: 40px 32px;
}

/* ==========================================================================
   BRAND COLUMN & LOGO
   ========================================================================== */
.footer__brand {
    display: flex;
    flex-direction: column;
}

.footer__brand-logo {
    font-weight: 800;
    font-size: 1.5rem;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px; /* Gap giữa Icon và chữ */
    letter-spacing: -0.02em;
    width: fit-content;
}

.footer__brand-logo i {
    color: var(--gold);
    font-size: 1.6rem;
}

/* Two-color Text Branding */
.footer__logo-text-main {
    color: var(--text-main);
    margin: 0;
    padding: 0;
}

.footer__logo-text-accent {
    color: var(--gold);
    margin: 0;
    padding: 0;
}

.footer__brand-desc {
    max-width: 320px;
    margin: 12px 0 20px;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-muted);
}

/* Social Buttons */
.footer__social {
    display: flex;
    gap: 10px;
}

.footer__social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--navy-card);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    transition: all var(--transition);
    text-decoration: none;
    flex-shrink: 0;
}

.footer__social-link:hover {
    background: var(--gold);
    color: var(--white);
    border-color: var(--gold);
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(217, 119, 6, 0.2);
}

/* ==========================================================================
   NAVIGATION COLUMNS
   ========================================================================== */
.footer__col {
    display: flex;
    flex-direction: column;
}

.footer__col-heading {
    color: var(--text-main);
    font-weight: 700;
    font-size: 0.95rem;
    margin: 0 0 16px 0;
}

.footer__list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer__link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.875rem;
    transition: all var(--transition);
    display: inline-block;
}

.footer__link:hover {
    color: var(--gold);
    transform: translateX(4px);
}

/* ==========================================================================
   BOTTOM BAR
   ========================================================================== */
.footer__bottom {
    max-width: 1400px;
    margin: 48px auto 0;
    padding: 24px 32px 0;
    border-top: 1px solid var(--border-color);
}

.footer__bottom-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--text-dim);
}

.footer__bottom-left {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.footer__divider {
    color: var(--border-color);
    font-size: 0.8rem;
}

.footer__partner {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer__bottom-right {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.footer__contact {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--transition);
}

a.footer__contact:hover {
    color: var(--gold);
}

.footer__contact i {
    color: var(--gold);
}

.footer__highlight {
    color: var(--gold);
    font-weight: 700;
}

/* ==========================================================================
   RESPONSIVE BREAKPOINTS
   ========================================================================== */
@media (max-width: 1024px) {
    .footer__container {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer__brand {
        grid-column: 1 / -1;
    }
}

@media (max-width: 640px) {
    .footer {
        padding: 40px 0 24px;
    }

    .footer__container {
        padding: 0 16px;
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .footer__bottom {
        padding: 24px 16px 0;
        margin-top: 32px;
    }

    .footer__bottom-container {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer__bottom-right {
        flex-direction: column;
        gap: 12px;
    }

    .footer__divider {
        display: none;
    }

    .footer__bottom-left {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
}

.footer__back-to-top {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.85rem;
    font-family: inherit;
    transition: color var(--transition), transform var(--transition);
    padding: 0;
}

.footer__back-to-top:hover {
    color: var(--gold);
    transform: translateY(-2px);
}

.footer__back-to-top i {
    color: var(--gold);
    font-size: 0.9rem;
}

/* ==========================================================================
   HỢP TÁC & ĐẦU TƯ
   ========================================================================== */
.footer__cooperation {
    margin-top: 16px;
    font-size: 0.875rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

.footer__cooperation-link {
    color: var(--gold);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition);
}

.footer__cooperation-link:hover {
    color: var(--gold-hover);
    text-decoration: underline;
}

/* Responsive nhỏ – giữ nguyên khoảng cách */
@media (max-width: 640px) {
    .footer__cooperation {
        margin-top: 12px;
        font-size: 0.8rem;
    }
}