/* =========================================
   Edupidia Footer Component Styles
   Premium, minimal, futuristic
   ========================================= */

/* CSS Variables for Theming */
.edu-footer {
    --edu-bg: #101727;
    --edu-bg-gradient: linear-gradient(180deg, #141B2D 0%, #101727 100%);
    --edu-primary: #6366F1;
    --edu-primary-hover: #7C83FF;
    --edu-border: rgba(255, 255, 255, 0.08);
    --edu-heading: #FFFFFF;
    --edu-text: #A5B4CF;
    --edu-muted: #94A3B8;
    --edu-card: rgba(255, 255, 255, 0.04);
    --edu-glow: rgba(99, 102, 241, 0.4);
    
    /* Layout & Typography */
    --edu-radius: 14px;
    --edu-radius-sm: 10px;
    --edu-transition: cubic-bezier(0.4, 0, 0.2, 1);
    --edu-font: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* Light Mode Adaptation */
/* @media (prefers-color-scheme: light) {
    .edu-footer {
        --edu-bg: #F8FAFC;
        --edu-bg-gradient: linear-gradient(180deg, #FFFFFF 0%, #F1F5F9 100%);
        --edu-border: rgba(15, 23, 42, 0.08);
        --edu-heading: #0F172A;
        --edu-text: #475569;
        --edu-muted: #64748B;
        --edu-card: rgba(255, 255, 255, 0.8);
        --edu-glow: rgba(99, 102, 241, 0.25);
    }
} */

/* .light-mode .edu-footer,
[data-theme="light"] .edu-footer {
    --edu-bg: #F8FAFC;
    --edu-bg-gradient: linear-gradient(180deg, #FFFFFF 0%, #F1F5F9 100%);
    --edu-border: rgba(15, 23, 42, 0.08);
    --edu-heading: #0F172A;
    --edu-text: #475569;
    --edu-muted: #64748B;
    --edu-card: rgba(255, 255, 255, 0.8);
    --edu-glow: rgba(99, 102, 241, 0.25);
} */

/* =========================================
   Base Footer Styles
   ========================================= */
.edu-footer {
    background: var(--edu-bg-gradient);
    color: var(--edu-text);
    font-family: var(--edu-font);
    padding: 3rem 1.5rem 1.5rem;
    position: relative;
    overflow: hidden;
    border-top: 1px solid var(--edu-border);
    margin-top: auto;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.edu-footer *,
.edu-footer *::before,
.edu-footer *::after {
    box-sizing: border-box;
}

.edu-footer__container {
    max-width: 1280px;
    margin: 0 auto;
    width: 100%;
    position: relative;
    z-index: 2;
}

/* =========================================
   Animated Top Glow Divider
   ========================================= */
.edu-footer__glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent 0%,
        var(--edu-primary) 20%,
        var(--edu-primary-hover) 50%,
        var(--edu-primary) 80%,
        transparent 100%
    );
    background-size: 200% 100%;
    animation: edu-glow-slide 6s linear infinite;
    opacity: 0.9;
    z-index: 3;
}

.edu-footer__glow-soft {
    position: absolute;
    top: 0;
    left: 10%;
    right: 10%;
    height: 80px;
    background: radial-gradient(ellipse at top, var(--edu-glow) 0%, transparent 70%);
    opacity: 0.5;
    pointer-events: none;
    z-index: 1;
    filter: blur(20px);
}

@keyframes edu-glow-slide {
    0% { background-position: 0% 0; }
    100% { background-position: 200% 0; }
}

/* =========================================
   Top Grid Layout
   ========================================= */
.edu-footer__top {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

/* Columns - Clean, no glass cards (except brand) */
.edu-footer__col {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

/* Brand Section - Only section with glass effect */
.edu-footer__brand {
    background: var(--edu-card);
    border: 1px solid var(--edu-border);
    border-radius: var(--edu-radius);
    padding: 1.3rem;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: transform 0.5s var(--edu-transition), 
                border-color 0.4s ease, 
                box-shadow 0.5s ease;
}

.edu-footer__brand:hover {
    transform: translateY(-3px);
    border-color: rgba(99, 102, 241, 0.25);
    box-shadow: 0 16px 40px -16px rgba(99, 102, 241, 0.2);
}

/* Logo */
.edu-footer__logo {
    display: inline-flex;
    align-items: center;
    gap: 0.85rem;
    text-decoration: none;
    color: var(--edu-heading);
    margin-bottom: 1.25rem;
}

.edu-footer__logo-mark {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    transition: transform 0.5s var(--edu-transition), filter 0.4s ease;
    filter: drop-shadow(0 4px 12px rgba(99, 102, 241, 0.25));
}

.edu-footer__logo:hover .edu-footer__logo-mark {
    transform: rotate(-5deg) scale(1.06);
    filter: drop-shadow(0 6px 20px rgba(99, 102, 241, 0.5));
}

.edu-footer__logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--edu-heading) 0%, var(--edu-text) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.edu-footer__desc {
    font-size: 0.9375rem;
    line-height: 1.65;
    color: var(--edu-muted);
    margin: 0;
    max-width: 340px;
}

/* Headings */
.edu-footer__heading {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--edu-heading);
    margin: 0 0 1.5rem 0;
    position: relative;
    padding-bottom: 0.75rem;
}

.edu-footer__heading::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 20px;
    height: 2px;
    background: var(--edu-primary);
    border-radius: 2px;
    transition: width 0.4s var(--edu-transition);
}

.edu-footer__col:hover .edu-footer__heading::after {
    width: 32px;
}

/* Links List */
.edu-footer__list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
}

.edu-footer__link {
    color: var(--edu-text);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 400;
    position: relative;
    display: inline-block;
    width: fit-content;
    padding: 2px 0;
    word-break: break-word;
    transition: color 0.3s ease, transform 0.3s var(--edu-transition);
}

.edu-footer__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, var(--edu-primary), var(--edu-primary-hover));
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.4s var(--edu-transition);
    border-radius: 1px;
}

.edu-footer__link:hover {
    color: var(--edu-heading);
    transform: translateX(2px);
}

.edu-footer__link:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* Social Icons */
.edu-footer__socials {
    display: flex;
    flex-wrap: wrap;
    gap: 0.625rem;
}

.edu-footer__social {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--edu-radius-sm);
    background: var(--edu-card);
    border: 1px solid var(--edu-border);
    color: var(--edu-text);
    text-decoration: none;
    transition: all 0.35s var(--edu-transition);
    position: relative;
    overflow: hidden;
}

.edu-footer__social::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--edu-primary), var(--edu-primary-hover));
    opacity: 0;
    transition: opacity 0.35s ease;
    z-index: 0;
}

.edu-footer__social svg {
    width: 18px;
    height: 18px;
    position: relative;
    z-index: 1;
    transition: transform 0.35s var(--edu-transition), color 0.35s ease;
}

.edu-footer__social:hover {
    color: #ffffff;
    transform: translateY(-3px);
    border-color: var(--edu-primary);
    box-shadow: 0 10px 28px -8px rgba(99, 102, 241, 0.5);
}

.edu-footer__social:hover::before {
    opacity: 1;
}

.edu-footer__social:hover svg {
    transform: scale(1.15);
}

/* =========================================
   Trust Statement
   ========================================= */
.edu-footer__trust {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.625rem;
    padding: 0.9rem 1.2rem;
    margin: 0 auto 1rem;
    max-width: fit-content;
    background: var(--edu-card);
    border: 1px solid var(--edu-border);
    border-radius: 100px;
    font-size: 0.8125rem;
    color: var(--edu-muted);
    letter-spacing: 0.01em;
    transition: border-color 0.3s ease, transform 0.3s var(--edu-transition);
}

.edu-footer__trust:hover {
    border-color: rgba(99, 102, 241, 0.25);
    transform: translateY(-1px);
}

.edu-footer__trust-icon {
    width: 16px;
    height: 16px;
    color: var(--edu-primary);
    flex-shrink: 0;
}

.edu-footer__trust-text {
    white-space: nowrap;
}

.edu-footer__trust-dot {
    opacity: 0.4;
    margin: 0 0.25rem;
}

/* =========================================
   Bottom Bar
   ========================================= */
.edu-footer__bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--edu-border);
    font-size: 0.875rem;
    color: var(--edu-muted);
    flex-wrap: wrap;
    gap: 1rem;
}

.edu-footer__bottom p {
    margin: 0;
}

.edu-footer__version {
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    font-size: 0.8125rem;
    padding: 0.25rem 0.625rem;
    background: var(--edu-card);
    border: 1px solid var(--edu-border);
    border-radius: 6px;
    color: var(--edu-text);
}

.edu-footer__heart {
    display: inline-block;
    color: #EF4444;
    animation: edu-heartbeat 1.8s ease-in-out infinite;
}

@keyframes edu-heartbeat {
    0%, 100% { transform: scale(1); }
    25% { transform: scale(1.18); }
    50% { transform: scale(1); }
    75% { transform: scale(1.1); }
}

/* =========================================
   Back to Top Button
   ========================================= */
.edu-back-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--edu-primary), var(--edu-primary-hover));
    color: #ffffff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 24px -6px rgba(99, 102, 241, 0.5),
                0 0 0 1px rgba(255, 255, 255, 0.1) inset;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.9);
    transition: opacity 0.4s var(--edu-transition),
                visibility 0.4s var(--edu-transition),
                transform 0.4s var(--edu-transition),
                box-shadow 0.3s ease;
    z-index: 999;
}

.edu-back-top--visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.edu-back-top:hover {
    transform: translateY(-4px) scale(1.08);
    box-shadow: 0 14px 32px -6px rgba(99, 102, 241, 0.65),
                0 0 0 1px rgba(255, 255, 255, 0.15) inset;
}

.edu-back-top:active {
    transform: translateY(-2px) scale(1.02);
}

.edu-back-top__icon {
    width: 20px;
    height: 20px;
    transition: transform 0.3s var(--edu-transition);
}

.edu-back-top:hover .edu-back-top__icon {
    transform: translateY(-2px);
}

/* =========================================
   Reveal Animations
   ========================================= */
.edu-reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.9s var(--edu-transition), 
                transform 0.9s var(--edu-transition);
}

.edu-reveal--visible {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered reveal for columns */
.edu-footer__top.edu-reveal--visible .edu-footer__col {
    animation: edu-col-fade 0.7s var(--edu-transition) backwards;
}

.edu-footer__top.edu-reveal--visible .edu-footer__col:nth-child(1) { animation-delay: 0.1s; }
.edu-footer__top.edu-reveal--visible .edu-footer__col:nth-child(2) { animation-delay: 0.2s; }
.edu-footer__top.edu-reveal--visible .edu-footer__col:nth-child(3) { animation-delay: 0.3s; }
.edu-footer__top.edu-reveal--visible .edu-footer__col:nth-child(4) { animation-delay: 0.4s; }
.edu-footer__top.edu-reveal--visible .edu-footer__col:nth-child(5) { animation-delay: 0.5s; }

@keyframes edu-col-fade {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =========================================
   Accessibility: Focus States
   ========================================= */
.edu-footer__link:focus-visible,
.edu-footer__social:focus-visible,
.edu-footer__logo:focus-visible,
.edu-back-top:focus-visible {
    outline: 2px solid var(--edu-primary);
    outline-offset: 3px;
    border-radius: 6px;
}

.edu-back-top:focus-visible {
    border-radius: 50%;
}

/* =========================================
   Reduced Motion
   ========================================= */
@media (prefers-reduced-motion: reduce) {
    .edu-reveal,
    .edu-footer__link,
    .edu-footer__brand,
    .edu-footer__social,
    .edu-footer__logo-mark,
    .edu-footer__heart,
    .edu-back-top,
    .edu-footer__glow,
    .edu-footer__trust {
        transition: none !important;
        transform: none !important;
        opacity: 1 !important;
        animation: none !important;
    }
    .edu-footer__top.edu-reveal--visible .edu-footer__col {
        animation: none !important;
    }
}

/* =========================================
   Responsive Breakpoints
   ========================================= */

/* Laptop / Small Desktop */
@media (max-width: 1200px) {
    .edu-footer__top {
        grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
        gap: 2rem;
    }
}

/* Tablet */
@media (max-width: 1024px) {
    .edu-footer {
        padding: 4rem 1.5rem 2rem;
    }
    
    .edu-footer__top {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.8rem;
    align-items: start;
    }

    .edu-footer__brand {
        grid-column: 1 / -1;
        max-width: 100%;
    }
}

/* =========================================
   Mobile (0–640px)
   ========================================= */
@media (max-width: 640px) {

    .edu-footer {
        padding: 2rem 1rem 1rem;
    }

    .edu-footer__top {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 1.25rem;
        margin-bottom: 1.25rem;
        align-items: start;
    }

    /* Brand Full Width */
    .edu-footer__brand {
        grid-column: 1 / -1;
        padding: 1rem;
        margin-bottom: .25rem;
    }

    .edu-footer__logo {
        margin-bottom: .8rem;
    }

    .edu-footer__logo-text {
        font-size: 1.25rem;
    }

    .edu-footer__desc {
        font-size: .82rem;
        line-height: 1.55;
    }

    /* Headings */
    .edu-footer__heading {
        font-size: .72rem;
        margin-bottom: .75rem;
        padding-bottom: .4rem;
    }

    .edu-footer__heading::after {
        width: 18px;
    }

    /* Links */
    .edu-footer__list {
        gap: .55rem;
    }

    .edu-footer__link {
        font-size: .84rem;
    }

    /* Connect */
    .edu-footer__socials {
        gap: .45rem;
    }

    .edu-footer__social {
        width: 36px;
        height: 36px;
    }

    .edu-footer__social svg {
        width: 16px;
        height: 16px;
    }

    /* Trust */
    .edu-footer__trust {
        margin: .75rem auto;
        padding: .75rem .9rem;
        font-size: .72rem;
        max-width: 100%;
        flex-wrap: wrap;
        text-align: center;
        justify-content: center;
        gap: .35rem;
    }

    .edu-footer__trust-text {
        white-space: normal;
        line-height: 1.4;
    }

    /* Bottom */
    .edu-footer__bottom {
        flex-direction: column;
        gap: .45rem;
        text-align: center;
        padding-top: .8rem;
    }

    .edu-footer__bottom p,
    .edu-footer__version {
        font-size: .75rem;
    }

    /* Back To Top */
    .edu-back-top {
        width: 42px;
        height: 42px;
        right: 14px;
        bottom: 14px;
    }
}

/* =========================================
   Extra Small Phones
   ========================================= */
@media (max-width: 420px) {

    .edu-footer {
        padding: 1.8rem .9rem .9rem;
    }

    .edu-footer__top {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .edu-footer__brand {
        padding: .9rem;
    }

    .edu-footer__logo-text {
        font-size: 1.15rem;
    }

    .edu-footer__desc {
        font-size: .8rem;
    }

    .edu-footer__col {
        text-align: left;
    }

    .edu-footer__socials {
        justify-content: flex-start;
    }

    .edu-footer__trust {
        font-size: .7rem;
    }
}