/* TradeVision - Professional Footer Styles
   4-Column Responsive Layout with Colorful Social Media Icons
   Dark/Light Mode Support
   ================================================== */

/* ================================================
   Footer Container
   ================================================ */
.footer-professional {
    background: var(--color-surface);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: 4rem 0 2rem;
    margin-top: 6rem;
    position: relative;
}

:root[data-theme="light"] .footer-professional {
    background: var(--color-gray-lightest);
    border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

@media (max-width: 768px) {
    .footer-container {
        padding: 0 1.5rem;
    }
}

/* ================================================
   Footer Grid Layout
   4 Columns → 2 Columns → 1 Column
   ================================================ */
.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 3rem;
    margin-bottom: 3rem;
}

@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2.5rem;
    }
}

@media (max-width: 640px) {
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

/* ================================================
   Footer Column
   ================================================ */
.footer-column {
    display: flex;
    flex-direction: column;
}

/* Footer Titles */
.footer-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 1.5rem;
    letter-spacing: -0.01em;
}

/* Footer Text */
.footer-text {
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
    opacity: 0.85;
}

/* ================================================
   Footer Links
   ================================================ */
.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
}

.footer-links li {
    margin: 0;
}

.footer-links a {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    display: inline-block;
    position: relative;
    transition: color var(--transition-base), transform var(--transition-base);
    opacity: 0.85;
}

.footer-links a:hover {
    color: var(--color-text-primary);
    transform: translateX(4px);
    opacity: 1;
}

.footer-links a::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-text-primary);
    transition: width var(--transition-smooth);
}

.footer-links a:hover::before {
    width: 100%;
}

/* ================================================
   Footer Contact Info
   ================================================ */
.footer-contact {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.footer-contact li {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
}

.footer-contact .icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    opacity: 0.7;
}

.footer-contact a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-base);
    opacity: 0.85;
}

.footer-contact a:hover {
    color: var(--color-text-primary);
    opacity: 1;
}

.footer-contact span {
    opacity: 0.85;
}

/* ================================================
   Social Media Icons - Colorful Professional
   ================================================ */
.footer-social {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.social-icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.social-icon svg {
    width: 20px;
    height: 20px;
    position: relative;
    z-index: 2;
    transition: transform var(--transition-base);
}

.social-icon:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}

.social-icon:hover svg {
    transform: scale(1.1);
}

.social-icon:active {
    transform: translateY(-1px);
}

/* LinkedIn - Brand Blue */
.social-icon-linkedin {
    background: #0A66C2;
}

.social-icon-linkedin:hover {
    background: #004182;
    box-shadow: 0 4px 16px rgba(10, 102, 194, 0.4);
}

/* GitHub - Adaptive (Dark in dark mode, Light in light mode) */
.social-icon-github {
    background: #181717;
}

.social-icon-github:hover {
    background: #000000;
    box-shadow: 0 4px 16px rgba(24, 23, 23, 0.4);
}

:root[data-theme="light"] .social-icon-github {
    background: #24292e;
}

:root[data-theme="light"] .social-icon-github:hover {
    background: #181717;
}

/* Instagram - Gradient */
.social-icon-instagram {
    background: linear-gradient(135deg,
        #E1306C 0%,
        #C13584 25%,
        #833AB4 50%,
        #5851DB 75%,
        #405DE6 100%
    );
}

.social-icon-instagram:hover {
    background: linear-gradient(135deg,
        #d91a5f 0%,
        #b72877 25%,
        #7432a7 50%,
        #4a44ce 75%,
        #3550d9 100%
    );
    box-shadow: 0 4px 16px rgba(225, 48, 108, 0.4);
}

/* Focus states for accessibility */
.social-icon:focus-visible {
    outline: 2px solid var(--color-text-primary);
    outline-offset: 2px;
    transform: translateY(-3px);
}

/* ================================================
   Footer Bottom - Copyright Section
   ================================================ */
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 2rem;
    text-align: center;
}

:root[data-theme="light"] .footer-bottom {
    border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.footer-bottom p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin: 0.5rem 0;
    opacity: 0.7;
}

.footer-built {
    font-weight: 500;
    opacity: 0.6;
}

/* ================================================
   Responsive Typography
   ================================================ */
@media (max-width: 640px) {
    .footer-professional {
        padding: 3rem 0 1.5rem;
        margin-top: 4rem;
    }

    .footer-title {
        font-size: 1rem;
        margin-bottom: 1rem;
    }

    .footer-text,
    .footer-links a,
    .footer-contact li {
        font-size: 0.875rem;
    }

    .footer-bottom p {
        font-size: 0.8125rem;
    }
}

/* ================================================
   Performance Optimizations
   ================================================ */
.footer-professional * {
    will-change: auto;
}

.social-icon,
.footer-links a {
    will-change: transform;
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    .footer-professional *,
    .social-icon,
    .footer-links a {
        transition: none !important;
        animation: none !important;
    }
}