/* 
   Pitechpedia - Google Material Design 3 Gallery
   Author: Antigravity Team
   Theme: Material You (M3)
*/

:root {
    /* M3 Light Palette */
    --m3-primary: #4285F4;
    --m3-on-primary: #ffffff;
    --m3-primary-container: #d3e3fd;
    --m3-on-primary-container: #041e49;
    
    --m3-secondary: #5e5e5e;
    --m3-on-secondary: #ffffff;
    --m3-secondary-container: #e6e6e6;
    
    --m3-tertiary: #16a34a;
    --m3-on-tertiary: #ffffff;
    
    --m3-surface: #f8f9fa;
    --m3-surface-container-low: #f1f3f4;
    --m3-surface-container: #f0f2f4;
    --m3-surface-variant: #e1e2e6;
    --m3-on-surface: #1f1f1f;
    --m3-on-surface-variant: #44474e;
    
    --m3-outline: #74777f;
    --m3-outline-variant: #c4c7cf;
    
    --m3-error: #b3261e;
    
    /* Layout Constants */
    --drawer-width: 320px;
    --header-height: 64px;
    --surface-radius: 24px;
    --card-radius: 16px;
}

body.dark-mode {
    /* M3 Dark Palette */
    --m3-primary: #a8c7fa;
    --m3-on-primary: #062e6f;
    --m3-primary-container: #0842a0;
    --m3-on-primary-container: #d3e3fd;
    
    --m3-surface: #1a1c1e;
    --m3-surface-container-low: #0f1113; /* Darker for distinction */
    --m3-surface-container: #1d1f21;
    --m3-surface-variant: #44474e;
    --m3-on-surface: #e2e2e6;
    --m3-on-surface-variant: #c4c7cf;
    
    --m3-outline: #8e9099;
}

/* --- Base Reset --- */
body {
    background-color: var(--m3-surface) !important;
    color: var(--m3-on-surface);
    margin: 0;
    font-family: 'Inter', sans-serif;
    overflow: hidden; /* Main scroll handled in surface */
}

/* --- Layout Structure --- */
.m3-gallery-layout {
    display: flex;
    height: calc(100vh - var(--header-height));
    width: 100vw;
    background: var(--m3-surface);
}

/* --- Navigation Drawer --- */
.m3-nav-drawer {
    width: var(--drawer-width);
    background: var(--m3-surface-container-low);
    border-right: 1px solid var(--m3-outline-variant);
    padding: 24px 0; /* Vertical padding only, let items handle horizontal */
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: transform 0.3s ease;
    z-index: 1000; /* Above surface */
    overflow-y: auto; 
    max-height: 100%;
}

.drawer-header {
    padding: 0 24px 24px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.m3-icon-container {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: var(--m3-primary-container);
    color: var(--m3-on-primary-container);
    display: flex;
    align-items: center;
    justify-content: center;
}

.m3-title-medium {
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    letter-spacing: 0.1px;
}

/* Nav Items */
.m3-nav-items {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.m3-nav-item {
    height: 56px;
    border-radius: 28px;
    border: none;
    background: transparent;
    display: flex;
    align-items: center;
    padding: 0 24px;
    gap: 12px;
    color: var(--m3-on-surface) !important; 
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.2, 0, 0, 1);
    position: relative;
    overflow: hidden;
    width: calc(100% - 24px); /* Account for padding */
    margin: 0 auto 4px auto;
}

.m3-nav-item:hover {
    background: rgba(0, 0, 0, 0.04);
}

body.dark-mode .m3-nav-item:hover {
    background: rgba(255, 255, 255, 0.08);
}

.m3-nav-item.active {
    background: var(--m3-primary-container) !important;
    color: var(--m3-on-primary-container) !important;
    font-weight: 700;
}

.m3-nav-item.active .item-icon {
    color: var(--m3-on-primary-container);
    font-variation-settings: 'FILL' 1, 'wght' 400;
}

.item-icon {
    font-size: 24px;
    font-variation-settings: 'FILL' 0, 'wght' 400;
    color: var(--m3-on-surface-variant);
}

.item-label {
    font-size: 0.875rem;
    font-weight: 500;
}

.sec-title {
    padding: 16px;
    color: var(--m3-on-surface-variant);
    font-weight: 500;
}

/* Drawer Footer */
.drawer-footer {
    margin-top: auto;
    padding: 16px;
}

.m3-theme-surface {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--m3-surface-variant);
    border-radius: 16px;
}

.label-box {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--m3-on-surface-variant);
}

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--m3-primary);
    font-size: 32px;
}

/* --- Main Surface --- */
.m3-main-surface {
    flex: 1;
    overflow-y: auto;
    padding: 32px 48px;
    background: var(--m3-surface);
    display: flex;
    flex-direction: column;
    gap: 32px;
    scroll-behavior: smooth;
}

.m3-header-top {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.drawer-toggle {
    display: none; /* Hidden on desktop */
    z-index: 100;
    width: 44px;
    height: 44px;
    background: var(--m3-surface-container-high);
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.m3-headline-block h1 {
    font-family: 'Outfit', sans-serif;
    color: var(--m3-on-surface);
    margin: 0 0 8px 0;
}

.m3-headline-block p {
    color: var(--m3-on-surface-variant);
    max-width: 600px;
}

.m3-header-actions {
    display: flex;
    gap: 12px;
}

.m3-btn-tonal {
    height: 40px;
    padding: 0 24px;
    border-radius: 20px;
    border: none;
    background: var(--m3-secondary-container);
    color: var(--m3-on-secondary-container);
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    cursor: pointer;
}

/* --- Masonry Grid --- */
.m3-masonry-grid {
    column-count: 3;
    column-gap: 24px;
    padding-bottom: 40px;
}

@media (max-width: 1400px) { .m3-masonry-grid { column-count: 2; } }
@media (max-width: 800px) { .m3-masonry-grid { column-count: 1; } }

/* --- M3 Cards --- */
.m3-card {
    break-inside: avoid;
    margin-bottom: 24px;
    border-radius: var(--card-radius);
    background: var(--m3-surface-container);
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.2, 0, 0, 1);
    position: relative;
    border: 1px solid transparent;
}

.m3-card.elevated {
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
}

.m3-card:hover {
    box-shadow: 0 4px 8px rgba(0,0,0,0.18);
    transform: translateY(-4px);
    border-color: var(--m3-outline-variant);
}

.m3-card-media {
    position: relative;
    padding-top: 66%;
    background: var(--m3-surface-variant);
    overflow: hidden;
}

.m3-card-media img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s cubic-bezier(0.2, 0, 0, 1);
}

.m3-card:hover .m3-card-media img {
    transform: scale(1.05);
}

.m3-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 12px;
    border-radius: 8px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    z-index: 2;
    background: var(--m3-primary);
    color: var(--m3-on-primary);
}

.m3-badge.blue { background: var(--m3-primary); }
.m3-badge.orange { background: #ea580c; }
.m3-badge.green { background: #16a34a; }
.m3-badge.purple { background: #7c3aed; }

.m3-card-footer {
    padding: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.m3-card-text {
    flex: 1;
}

.m3-title-small {
    margin: 0;
    font-weight: 600;
    color: var(--m3-on-surface);
}

.m3-body-small {
    margin: 4px 0 0 0;
    color: var(--m3-on-surface-variant);
}

.m3-icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 20px;
    border: none;
    background: transparent;
    color: var(--m3-on-surface-variant);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.2s;
}

.m3-icon-btn:hover {
    background: rgba(0, 0, 0, 0.06);
}

/* --- Load More --- */
.m3-load-more {
    display: flex;
    justify-content: center;
    padding: 24px 0 64px;
}

.m3-btn-filled {
    height: 40px;
    padding: 0 24px;
    border-radius: 20px;
    border: none;
    background: var(--m3-primary);
    color: var(--m3-on-primary);
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    cursor: pointer;
    box-shadow: 0 1px 2px rgba(0,0,0,0.3);
    transition: box-shadow 0.2s;
}

.m3-btn-filled:hover {
    box-shadow: 0 2px 4px rgba(0,0,0,0.4);
}

/* --- Lightbox Dialog --- */
.m3-dialog-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(12px);
    z-index: 9999;
    display: none;
    flex-direction: column;
}

.m3-dialog-header {
    height: 64px;
    padding: 0 24px;
    display: flex;
    align-items: center;
    color: white;
    gap: 16px;
    background: linear-gradient(to bottom, rgba(0,0,0,0.5), transparent);
}

.m3-dialog-title-block {
    flex: 1;
}

.m3-dialog-title-block h4 {
    margin: 0;
}

.m3-dialog-title-block p {
    margin: 2px 0 0 0;
    opacity: 0.7;
}

.m3-dialog-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    position: relative;
}

.m3-image-viewer {
    flex: 1;
    height: 80%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.m3-image-viewer img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 12px;
    box-shadow: 0 24px 48px rgba(0,0,0,0.5);
}

.m3-nav-fab {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    border: none;
    background: var(--m3-surface-container);
    color: var(--m3-on-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
    transition: transform 0.2s;
}

.m3-nav-fab:hover {
    transform: scale(1.1);
}

/* Mobile Adjustments */
@media (max-width: 768px) {
    .m3-nav-drawer {
        position: fixed;
        left: -320px;
        height: 100%;
    }
    
    .m3-nav-drawer.open {
        transform: translateX(320px);
        box-shadow: 8px 0 24px rgba(0,0,0,0.2);
    }

    .drawer-toggle {
        display: flex;
        background: var(--m3-surface-container);
    }
    
    .m3-header-top {
        gap: 12px;
    }
    
    .m3-main-surface {
        padding: 24px 20px;
    }
    
    .m3-dialog-content {
        padding: 0 20px;
    }
    
    .m3-nav-fab {
        width: 48px;
        height: 48px;
    }
}