/* ==========================================
   Diagrams Gallery Styles
   ========================================== */

:root {
    /* Layout */
    --dg-max-width: 1400px;
    --dg-radius: 14px;
    --dg-radius-lg: 18px;
    --dg-gap: 24px;
    /* Dark Mode Colors */
    --dg-bg: #0a0a0a;
    --dg-surface: rgba(255, 255, 255, 0.04);
    --dg-surface-hover: rgba(255, 255, 255, 0.08);
    --dg-border: rgba(255, 255, 255, 0.10);
    --dg-border-hover: rgba(255, 255, 255, 0.20);
    --dg-text-primary: rgba(255, 255, 255, 0.96);
    --dg-text-secondary: rgba(255, 255, 255, 0.72);
    --dg-text-tertiary: rgba(255, 255, 255, 0.50);
    --dg-shadow: 0 20px 60px rgba(0, 0, 0, 0.40);
    --dg-shadow-lg: 0 30px 80px rgba(0, 0, 0, 0.60);
    /* Accents */
    --dg-accent: #00d9ff;
    --dg-accent-secondary: #ff8800;
    --dg-accent-rgb: 0, 217, 255;
    /* Overlays */
    --dg-overlay: rgba(0, 0, 0, 0.85);
    --dg-glass: rgba(0, 0, 0, 0.60);
}

/* Light Mode */
[data-theme="light"],
.light-theme,
html.theme-light {
    --dg-bg: #ffffff;
    --dg-surface: rgba(0, 0, 0, 0.03);
    --dg-surface-hover: rgba(0, 0, 0, 0.06);
    --dg-border: rgba(0, 0, 0, 0.12);
    --dg-border-hover: rgba(0, 0, 0, 0.24);
    --dg-text-primary: rgba(0, 0, 0, 0.92);
    --dg-text-secondary: rgba(0, 0, 0, 0.68);
    --dg-text-tertiary: rgba(0, 0, 0, 0.45);
    --dg-shadow: 0 16px 48px rgba(0, 0, 0, 0.12);
    --dg-shadow-lg: 0 24px 64px rgba(0, 0, 0, 0.18);
    --dg-overlay: rgba(255, 255, 255, 0.95);
    --dg-glass: rgba(255, 255, 255, 0.85);
}

/* ==========================================
   RESET & BASE
   ========================================== */

* {
    box-sizing: border-box;
}

/* Fix overflow issues */
html {
    overflow-x: hidden;
}

body {
    margin: 0;
    overflow-x: hidden;
}

/* ==========================================
   PAGE LAYOUT
   ========================================== */

.diagrams-page {
    width: 100%;
    max-width: var(--dg-max-width);
    margin: 0 auto;
    padding: clamp(48px, 6vw, 96px) clamp(20px, 4vw, 48px) 100px;
    color: var(--dg-text-primary);
    position: relative;
}

    /* Remove the glow background to avoid overflow */
    .diagrams-page::before {
        display: none;
    }

/* ==========================================
   HEADER
   ========================================== */

.diagrams-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.header-content h1 {
    margin: 0 0 8px 0;
    font-size: clamp(32px, 5vw, 52px);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: var(--dg-text-primary);
}

.header-content p {
    margin: 0;
    font-size: clamp(14px, 1.5vw, 17px);
    line-height: 1.5;
    color: var(--dg-text-secondary);
    max-width: 600px;
}

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

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: var(--dg-radius);
    background: var(--dg-surface);
    border: 1.5px solid var(--dg-border);
    color: var(--dg-text-primary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--dg-shadow);
}

    .btn-back:hover {
        background: var(--dg-surface-hover);
        border-color: var(--dg-border-hover);
        transform: translateY(-2px);
    }

    .btn-back svg {
        transition: transform 0.25s ease;
    }

    .btn-back:hover svg {
        transform: translateX(-3px);
    }

/* ==========================================
   GRID
   ========================================== */

.diagrams-grid {
    display: grid;
    gap: var(--dg-gap);
    grid-template-columns: 1fr;
}

@media (min-width: 768px) {
    .diagrams-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1200px) {
    .diagrams-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ==========================================
   DIAGRAM CARDS
   ========================================== */

.diagram-card {
    position: relative;
    display: flex;
    flex-direction: column;
    border-radius: var(--dg-radius-lg);
    overflow: hidden;
    background: var(--dg-surface);
    border: 1.5px solid var(--dg-border);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--dg-shadow);
}

    .diagram-card:hover {
        transform: translateY(-8px);
        border-color: var(--dg-border-hover);
        box-shadow: var(--dg-shadow-lg);
    }

/* Card Image */
.card-image {
    position: relative;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: linear-gradient(135deg, rgba(var(--dg-accent-rgb), 0.05), rgba(255, 136, 0, 0.05));
}

    .card-image img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    }

.diagram-card:hover .card-image img {
    transform: scale(1.05);
}

/* Overlay on hover */
.card-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(var(--dg-accent-rgb), 0.15), rgba(255, 136, 0, 0.10));
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.diagram-card:hover .card-overlay {
    opacity: 1;
}

.card-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.20);
    border: 2px solid rgba(255, 255, 255, 0.30);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transform: scale(0.9);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.diagram-card:hover .card-icon {
    transform: scale(1);
}

/* Card Content */
.card-content {
    padding: 18px 20px 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.card-title {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
    line-height: 1.3;
    color: var(--dg-text-primary);
    flex: 1;
}

.card-badge {
    padding: 4px 10px;
    border-radius: 6px;
    background: rgba(var(--dg-accent-rgb), 0.12);
    border: 1px solid rgba(var(--dg-accent-rgb), 0.20);
    color: var(--dg-accent);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-description {
    margin: 0;
    font-size: 13px;
    line-height: 1.5;
    color: var(--dg-text-secondary);
}

/* ==========================================
   LIGHTBOX
   ========================================== */

.gallery-lightbox {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: none;
    opacity: 0;
}

    .gallery-lightbox.active {
        display: block;
        opacity: 1;
    }

/* Backdrop */
.gallery-backdrop {
    position: fixed;
    inset: 0;
    background: var(--dg-overlay);
    backdrop-filter: blur(20px) saturate(120%);
    -webkit-backdrop-filter: blur(20px) saturate(120%);
    cursor: pointer;
}

/* Container */
.gallery-container {
    position: fixed;
    inset: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    pointer-events: none;
    animation: slideIn 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: scale(0.96) translateY(20px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* ==========================================
   TOP BAR - PREMIUM DESIGN
   ========================================== */

.gallery-topbar {
    display: flex;
    align-items: stretch;
    justify-content: space-between;
    gap: 20px;
    padding: 16px 20px;
    border-radius: var(--dg-radius);
    background: var(--dg-glass);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border: 1.5px solid var(--dg-border);
    box-shadow: var(--dg-shadow);
    pointer-events: all;
}

.gallery-info {
    display: flex;
    align-items: center;
    gap: 20px;
    min-width: 0;
    flex: 1;
}

.info-main {
    display: flex;
    align-items: center;
    gap: 24px;
    min-width: 0;
    flex: 1;
}

.info-text {
    min-width: 0;
    flex: 1;
}

.gallery-title {
    margin: 0 0 4px 0;
    font-size: 16px;
    font-weight: 700;
    color: var(--dg-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    letter-spacing: -0.01em;
}

.gallery-description {
    margin: 0;
    font-size: 12px;
    color: var(--dg-text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Modern Counter with Progress Bar */
.gallery-counter-modern {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 12px 18px;
    border-radius: 12px;
    background: var(--dg-surface);
    border: 1.5px solid var(--dg-border);
    min-width: 140px;
}

.counter-label {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--dg-text-tertiary);
}

.counter-display {
    display: flex;
    align-items: baseline;
    gap: 8px;
    font-weight: 700;
}

    .counter-display .current {
        font-size: 24px;
        color: var(--dg-accent);
        line-height: 1;
    }

    .counter-display .divider {
        width: 20px;
        height: 2px;
        background: var(--dg-border);
        border-radius: 2px;
        margin: 0 2px;
    }

    .counter-display .total {
        font-size: 16px;
        color: var(--dg-text-secondary);
        line-height: 1;
    }

.counter-progress {
    height: 4px;
    border-radius: 2px;
    background: var(--dg-surface-hover);
    overflow: hidden;
    position: relative;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--dg-accent) 0%, var(--dg-accent-secondary) 100%);
    border-radius: 2px;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 12px rgba(var(--dg-accent-rgb), 0.5);
}

/* Controls */
.gallery-controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 6px;
}

.control-divider {
    width: 1px;
    height: 32px;
    background: var(--dg-border);
}

.gallery-btn {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    border: 1.5px solid var(--dg-border);
    background: var(--dg-surface);
    color: var(--dg-text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

    .gallery-btn::before {
        content: '';
        position: absolute;
        inset: -1px;
        border-radius: inherit;
        padding: 1.5px;
        background: linear-gradient(135deg, var(--dg-accent) 0%, var(--dg-accent-secondary) 100%);
        -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
        -webkit-mask-composite: xor;
        mask-composite: exclude;
        opacity: 0;
        transition: opacity 0.25s ease;
    }

    .gallery-btn:hover {
        background: var(--dg-surface-hover);
        border-color: var(--dg-border-hover);
        transform: translateY(-2px);
    }

        .gallery-btn:hover::before {
            opacity: 1;
        }

    .gallery-btn:active {
        transform: translateY(0);
    }

    .gallery-btn.btn-close {
        background: rgba(255, 70, 70, 0.12);
        border-color: rgba(255, 70, 70, 0.25);
        color: #ff4646;
    }

        .gallery-btn.btn-close::before {
            background: linear-gradient(135deg, #ff4646 0%, #ff6b6b 100%);
        }

        .gallery-btn.btn-close:hover {
            background: rgba(255, 70, 70, 0.20);
            border-color: rgba(255, 70, 70, 0.40);
        }

/* ==========================================
   MAIN IMAGE AREA
   ========================================== */

.gallery-main {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 0;
    pointer-events: all;
}

.gallery-nav {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 1.5px solid var(--dg-border);
    background: var(--dg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    color: var(--dg-text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

    .gallery-nav:hover {
        background: var(--dg-surface-hover);
        border-color: var(--dg-border-hover);
        transform: scale(1.05);
    }

    .gallery-nav:active {
        transform: scale(0.95);
    }

/* Image Container */
.gallery-image-container {
    flex: 1;
    height: 100%;
    border-radius: var(--dg-radius-lg);
    overflow: hidden;
    background: rgba(0, 0, 0, 0.50);
    border: 1.5px solid var(--dg-border);
    position: relative;
    cursor: zoom-in;
    display: flex;
    align-items: center;
    justify-content: center;
}

.gallery-image {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    user-select: none;
    -webkit-user-drag: none;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: center center;
}

/* Zoom Hint */
.zoom-hint {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    padding: 10px 18px;
    border-radius: 10px;
    background: var(--dg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1.5px solid var(--dg-border);
    color: var(--dg-text-primary);
    font-size: 13px;
    font-weight: 500;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

    .zoom-hint.visible {
        opacity: 1;
    }

/* ==========================================
   THUMBNAILS - PREMIUM DESIGN
   ========================================== */

.gallery-thumbnails {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px;
    border-radius: var(--dg-radius);
    background: var(--dg-glass);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1.5px solid var(--dg-border);
    pointer-events: all;
}

.thumb-nav {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    border: 1.5px solid var(--dg-border);
    background: var(--dg-surface);
    color: var(--dg-text-primary);
    display: none; /* Hidden by default on desktop */
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

    .thumb-nav:hover {
        background: var(--dg-surface-hover);
        border-color: var(--dg-border-hover);
        transform: scale(1.05);
    }

    .thumb-nav:active {
        transform: scale(0.95);
    }

.thumbnails-wrapper {
    flex: 1;
    overflow: hidden;
}

.thumbnails-track {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    scroll-behavior: smooth;
    scrollbar-width: none;
    -ms-overflow-style: none;
    padding: 4px;
}

    .thumbnails-track::-webkit-scrollbar {
        display: none;
    }

.thumbnail-item {
    position: relative;
    flex-shrink: 0;
    width: 180px;
    cursor: pointer;
    border: 2px solid transparent;
    border-radius: 12px;
    background: var(--dg-surface);
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.thumbnail-image {
    position: relative;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: linear-gradient(135deg, rgba(var(--dg-accent-rgb), 0.05), rgba(255, 136, 0, 0.05));
}

    .thumbnail-image img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.3s ease;
    }

.thumbnail-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.6) 100%);
    display: flex;
    align-items: flex-start;
    justify-content: flex-start;
    padding: 8px;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.overlay-number {
    width: 26px;
    height: 26px;
    border-radius: 8px;
    background: var(--dg-glass);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--dg-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
    color: var(--dg-text-primary);
}

.thumbnail-info {
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.thumbnail-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--dg-text-primary);
    line-height: 1.3;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.thumbnail-badge {
    font-size: 9px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--dg-text-tertiary);
    padding: 3px 8px;
    border-radius: 4px;
    background: var(--dg-surface-hover);
    border: 1px solid var(--dg-border);
    display: inline-block;
    width: fit-content;
}

/* Hover state */
.thumbnail-item:hover {
    border-color: var(--dg-border-hover);
    transform: translateY(-4px);
    background: var(--dg-surface-hover);
}

    .thumbnail-item:hover .thumbnail-image img {
        transform: scale(1.08);
    }

    .thumbnail-item:hover .overlay-number {
        background: var(--dg-surface-hover);
        border-color: var(--dg-border-hover);
    }

/* Active state */
.thumbnail-item.active {
    border-color: var(--dg-accent);
    box-shadow: 0 0 0 1px var(--dg-accent), 0 8px 24px rgba(var(--dg-accent-rgb), 0.25);
    transform: translateY(-4px);
}

    .thumbnail-item.active .overlay-number {
        background: var(--dg-accent);
        border-color: var(--dg-accent);
        color: #000;
        font-weight: 800;
    }

    .thumbnail-item.active .thumbnail-title {
        color: var(--dg-accent);
    }

    .thumbnail-item.active .thumbnail-badge {
        background: rgba(var(--dg-accent-rgb), 0.15);
        border-color: rgba(var(--dg-accent-rgb), 0.30);
        color: var(--dg-accent);
    }

/* ==========================================
   RESPONSIVE
   ========================================== */

@media (max-width: 1024px) {
    .diagrams-page {
        padding: 32px 20px 80px;
    }

    .diagrams-header {
        margin-bottom: 32px;
    }

    .info-main {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    .gallery-counter-modern {
        width: 100%;
        max-width: 200px;
    }

    .control-group {
        gap: 4px;
    }

    .gallery-btn {
        width: 40px;
        height: 40px;
    }

    .thumbnail-item {
        width: 160px;
    }

    /* Show thumbnail nav arrows on tablet */
    .thumb-nav {
        display: flex;
    }
}




@media (max-width: 768px) {
    .diagrams-page {
        padding: 40px 16px 60px; /* Increased top padding from 24px to 40px */
    }

    .diagrams-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        margin-bottom: 28px;
        margin-top: 8px; /* Extra space to avoid overlap with nav */
    }

    .diagrams-grid {
        gap: 20px;
    }

    .gallery-container {
        inset: 8px;
        gap: 8px;
    }

    .gallery-topbar {
        flex-direction: column;
        align-items: stretch;
        padding: 14px 16px;
        gap: 14px;
    }

    .gallery-info {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
        width: 100%;
    }

    .info-main {
        width: 100%;
    }

    .gallery-counter-modern {
        max-width: none;
    }

    .gallery-controls {
        width: 100%;
        justify-content: space-between;
        flex-wrap: nowrap;
    }

    .control-divider {
        display: none;
    }

    .gallery-nav {
        position: absolute;
        z-index: 10;
        width: 44px;
        height: 44px;
    }

    .nav-prev {
        left: 12px;
    }

    .nav-next {
        right: 12px;
    }

    .gallery-thumbnails {
        padding: 8px;
    }

    .thumbnail-item {
        width: 140px;
    }

    .thumb-nav {
        display: none; /* Hide on mobile - not enough space */
    }
}

@media (max-width: 480px) {
    .gallery-btn {
        width: 38px;
        height: 38px;
    }

        .gallery-btn svg {
            width: 16px;
            height: 16px;
        }

    .gallery-counter-modern {
        padding: 10px 14px;
        min-width: 0;
    }

    .counter-display .current {
        font-size: 20px;
    }

    .counter-display .total {
        font-size: 14px;
    }

    .control-group {
        gap: 4px;
    }

    .thumbnail-item {
        width: 120px;
    }

    .thumbnail-title {
        font-size: 11px;
    }
}

/* ==========================================
   ACCESSIBILITY
   ========================================== */

.diagram-card:focus-visible,
.gallery-btn:focus-visible,
.gallery-nav:focus-visible,
.thumbnail-item:focus-visible {
    outline: 2px solid var(--dg-accent);
    outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ==========================================
   PRINT
   ========================================== */

@media print {
    .btn-back,
    .card-overlay,
    .gallery-lightbox {
        display: none !important;
    }

    .diagram-card {
        break-inside: avoid;
        box-shadow: none;
    }
}