/* ==========================================
   CAD-SIGNet - Component Styles
   ========================================== */

/* ==========================================
   BUTTONS
   ========================================== */

.button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: none;
    color: white;
    padding: 12px 24px;
    text-align: center;
    text-decoration: none;
    font-size: 17px;
    font-weight: 500;
    margin: 6px;
    cursor: pointer;
    border-radius: var(--border-radius-xl);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.button:hover::before {
    left: 100%;
}

.button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.button:active {
    transform: translateY(0);
}

.button .icon {
    font-size: 18px;
}

.project_button {
    background: linear-gradient(135deg, #5271ff 0%, #3a56d4 100%);
}

.paper_button {
    background: linear-gradient(135deg, #ff5757 0%, #d43a3a 100%);
}

.code_button {
    background: linear-gradient(135deg, #2ecc71 0%, #27ae60 100%);
}

.arxiv_button {
    background: linear-gradient(135deg, #9b59b6 0%, #8e44ad 100%);
}

.dataset_button {
    background: linear-gradient(135deg, #f39c12 0%, #d35400 100%);
}

.poster_button {
    background: linear-gradient(135deg, #1abc9c 0%, #16a085 100%);
}

/* Constrain coming-soon inside tabcontent to preserve badge styling */
.tabcontent .coming-soon {
    display: inline-block;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-xl);
    border-left: none;
    border: 2px dashed var(--bg-tertiary);
    padding: 15px 40px;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-muted);
    margin: 20px 0;
}

/* Disabled button state */
.button[style*="pointer-events: none"] {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ==========================================
   AUTHOR STYLES
   ========================================== */

.author {
    color: var(--primary-color);
    font-weight: 500;
    transition: all var(--transition-fast);
    position: relative;
}

.author::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width var(--transition-normal);
}

.author:hover::after {
    width: 100%;
}

.author:hover {
    color: var(--accent-color);
}

.sup {
    color: var(--accent-color);
    font-weight: 600;
    font-size: 0.7em;
    vertical-align: super;
}

/* ==========================================
   IMAGES
   ========================================== */

.center {
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 100%;
    height: auto;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-normal);
}

#teaser_image {
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
}

#teaser_image:hover {
    transform: scale(1.01);
    box-shadow: var(--shadow-glow);
}

#a2z_dataset_image {
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    background: white;
    padding: 20px;
    max-width: 72%;
    margin-left: auto;
    margin-right: auto;
}

body.dark-mode #a2z_dataset_image {
    background: var(--bg-tertiary);
}


#arch_image {
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    background: white;
    padding: 20px;
}

body.dark-mode #arch_image {
    background: var(--bg-tertiary);
}

/* ==========================================
   SECTION HEADINGS
   ========================================== */

h1.h1_section {
    font-size: clamp(1.6rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 30px;
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 15px;
}

h1.h1_section .section-number {
    font-size: 0.7em;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.8;
}

/* Numbered section styling */
.section-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 35px;
}

.section-number {
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 700;
    padding: 6px 14px;
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--border-radius-xl);
    letter-spacing: 1px;
}

.section-title {
    font-size: clamp(1.65rem, 3.5vw, 2.1rem);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ==========================================
   TABLE OF CONTENTS
   ========================================== */

#toc-container {
    position: fixed;
    top: 50%;
    left: 20px;
    transform: translateY(-50%);
    background: var(--bg-primary);
    padding: 20px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--bg-tertiary);
    display: none;
    z-index: 100;
    max-width: 220px;
    transition: all var(--transition-normal);
}

#toc-container:hover {
    box-shadow: var(--shadow-glow);
}

#toc-container h4 {
    margin: 0 0 15px 0;
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
}

#toc {
    list-style: none;
    padding: 0;
    margin: 0;
}

#toc li {
    margin-bottom: 8px;
    padding: 0;
}

#toc a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    display: block;
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
}

#toc a:hover,
#toc a.active {
    color: var(--primary-color);
    background: var(--bg-secondary);
    border-left-color: var(--primary-color);
}

#toc-container.visible {
    display: block;
    animation: slideInLeft 0.4s ease-out;
}

@media (max-width: 1200px) {
    #toc-container.visible {
        display: none;
    }
}

/* ==========================================
   DARK MODE TOGGLE
   ========================================== */

#toggle-switch-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 32px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-tertiary);
    transition: var(--transition-normal);
    border-radius: 32px;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
}

.slider:before {
    position: absolute;
    content: "";
    height: 24px;
    width: 24px;
    left: 4px;
    bottom: 4px;
    background: white;
    transition: var(--transition-normal);
    border-radius: 50%;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

input:checked + .slider {
    background: var(--gradient-primary);
}

input:checked + .slider:before {
    transform: translateX(28px);
}

/* ==========================================
   CITATION BLOCK
   ========================================== */

.citation_metadata {
    background: var(--bg-secondary);
    padding: 25px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--bg-tertiary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 15px;
    line-height: 1.8;
    position: relative;
    overflow: hidden;
}

.citation_metadata::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-primary);
}

.citation_metadata code {
    display: block;
    white-space: pre-wrap;
    word-break: break-word;
    color: var(--text-secondary);
}

.copy-button {
    margin-top: 15px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.copy-button:hover {
    transform: scale(1.1);
}

body.dark-mode .citation_metadata {
    background: var(--bg-secondary);
    border-color: var(--bg-tertiary);
}

body.dark-mode .citation_metadata code {
    color: var(--text-secondary);
}

/* ==========================================
   CONFERENCE BADGE
   ========================================== */

.cvpr {
    display: inline-block;
    font-size: 20px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-top: 25px;
    padding: 12px 30px;
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-md);
    animation: pulse 3s ease-in-out infinite;
}

.cvpr span {
    text-transform: none;
    font-weight: 500;
    opacity: 0.9;
}

/* ==========================================
   LISTS
   ========================================== */

.numbered_list {
    line-height: 1.9;
    padding-left: 25px;
    color: var(--text-secondary);
}

.numbered_list li {
    margin-bottom: 12px;
    padding-left: 8px;
}

.numbered_list li::marker {
    color: var(--primary-color);
    font-weight: 700;
}

.numbered_list ul {
    margin-top: 10px;
    list-style-type: disc;
}

.numbered_list ul li::marker {
    color: var(--accent-color);
}

/* ==========================================
   WEBAPP CONTAINER
   ========================================== */

.webapp_container {
    position: relative;
    display: flex;
    width: 100%;
    min-height: 400px;
    justify-content: center;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.webapp-renderer {
    border: none;
    border-radius: var(--border-radius-md);
}

.webapp_slider {
    position: absolute;
    cursor: ew-resize;
    width: 60px;
    height: 40px;
    background-image: url('/assets/img/arrow_red.png');
    background-size: 100%;
    background-repeat: no-repeat;
    border-radius: 50%;
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.2));
    transition: transform var(--transition-fast);
}

.webapp_slider:hover {
    transform: scale(1.1);
}

/* ==========================================
   DESIGN HISTORY CONTAINER
   ========================================== */

#des-his-container {
    display: flex;
    flex-direction: column;
    height: 60vh;
    padding: 15px;
    gap: 10px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
}

#viewer {
    display: flex;
    flex: 1;
    gap: 10px;
}

#pc-viewer {
    flex: 1;
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius-md);
    background: var(--bg-primary);
}

#step-viewer {
    display: flex;
    flex: 1;
    border: 2px solid var(--accent-color);
    border-radius: var(--border-radius-md);
    background: var(--bg-primary);
}

#intermediate-viewer {
    flex: 0.4;
    border: 2px solid var(--accent-secondary);
    border-radius: var(--border-radius-md);
    background: var(--bg-primary);
}

/* ==========================================
   GUI CONTROLS
   ========================================== */

#gui {
    position: absolute;
    top: 10px;
    left: 10px;
    z-index: 10;
}

/* ==========================================
   CANVAS CONTAINER
   ========================================== */

.canvas-container {
    position: relative;
    margin: 15px 0;
    border: 2px solid var(--bg-tertiary);
    border-radius: var(--border-radius-md);
    overflow: hidden;
}

body.dark-mode .canvas-container {
    border-color: var(--bg-tertiary);
}

/* ==========================================
   COMING SOON BADGE
   ========================================== */

.coming-soon {
    display: inline-block;
    padding: 15px 40px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-xl);
    font-size: 22px;
    font-weight: 600;
    color: var(--text-muted);
    border: 2px dashed var(--bg-tertiary);
    margin: 20px 0;
}

/* ==========================================
   FIGURE CAPTIONS
   ========================================== */

section p:has(b:first-child) {
    font-size: 20px;
    color: var(--text-muted);
    line-height: 1.7;
    margin-top: 20px;
    padding: 15px 20px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-md);
    border-left: 4px solid var(--primary-color);
}

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

@media (max-width: 767px) {
    .button {
        padding: 10px 18px;
        font-size: 14px;
        margin: 4px;
    }

    .cvpr {
        font-size: 14px;
        padding: 10px 20px;
        letter-spacing: 2px;
    }

    .citation_metadata {
        padding: 15px;
        font-size: 11px;
    }

    #toggle-switch-container {
        top: 10px;
        right: 10px;
    }

    .switch {
        width: 50px;
        height: 28px;
    }

    .slider:before {
        height: 20px;
        width: 20px;
    }

    input:checked + .slider:before {
        transform: translateX(22px);
    }
}

/* ==========================================
   LAB LOGO
   ========================================== */

#Lab\ Logo {
    max-width: 500px;
    margin-bottom: 30px;
    filter: drop-shadow(0 4px 12px rgba(0,0,0,0.1));
}

body.dark-mode #Lab\ Logo {
    filter: brightness(1.1) drop-shadow(0 4px 12px rgba(255,255,255,0.1));
}

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

@media print {
    #toggle-switch-container,
    #toc-container {
        display: none !important;
    }

    body {
        padding: 20px;
    }

    section {
        page-break-inside: avoid;
    }
}

/* ==========================================
   IMAGE SLIDER
   ========================================== */

.img-slider {
    position: relative;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    padding: 20px 60px 14px;
    margin: 16px 0;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--bg-tertiary);
}

.img-slider-track {
    display: flex;
    transition: transform 0.42s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform;
}

.img-slider-slide {
    min-width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 8px 0;
}

.img-slider-slide img {
    max-width: 88%;
    height: auto;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
    background: white;
    padding: 10px;
    display: block;
    transition: box-shadow var(--transition-normal);
}

body.dark-mode .img-slider-slide img {
    background: var(--bg-tertiary);
}

/* Prev / Next arrows */
.slider-nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 50%;
    width: 42px;
    height: 42px;
    font-size: 26px;
    line-height: 1;
    cursor: pointer;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-fast);
    padding-bottom: 2px;
}

.slider-nav-btn:hover {
    transform: translateY(-50%) scale(1.12);
    box-shadow: var(--shadow-lg);
}

.slider-prev-btn { left: 8px; }
.slider-next-btn { right: 8px; }

/* Dots + counter row */
.slider-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding-top: 12px;
}

.slider-dots {
    display: flex;
    gap: 8px;
}

.slider-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    cursor: pointer;
    padding: 0;
    transition: all var(--transition-fast);
}

.slider-dot.active {
    background: var(--primary-color);
    transform: scale(1.35);
    border-color: var(--primary-color);
}

.slider-dot:hover:not(.active) {
    background: var(--text-muted);
}

.slider-counter {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    min-width: 36px;
    text-align: center;
}

/* ==========================================
   VISUAL RESULTS SUB-SECTION LABEL
   ========================================== */

.vis-section-label {
    font-weight: 700;
    font-size: 15px;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    margin-bottom: 10px;
    background: linear-gradient(90deg, var(--accent-color), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ==========================================
   ANNOTATION QUALITY CHARTS GRID
   ========================================== */

.charts-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    margin-top: 16px;
}

.chart-wrapper {
    background: var(--bg-primary);
    border-radius: var(--border-radius-md);
    padding: 18px 16px 12px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--bg-tertiary);
    position: relative;
}

body.dark-mode .chart-wrapper {
    background: var(--bg-secondary);
}

@media (max-width: 767px) {
    .charts-grid {
        grid-template-columns: 1fr;
    }

    .img-slider {
        padding: 16px 46px 12px;
    }

    .slider-nav-btn {
        width: 34px;
        height: 34px;
        font-size: 20px;
    }

    .img-slider-slide img {
        max-width: 96%;
    }
}

/* ==========================================
   3D VIEWER COMPONENTS
   ========================================== */

.viewer-ui {
    margin-top: 12px;
}

.viewer-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
}

.viewer-select-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-color);
    white-space: nowrap;
    opacity: 0.80;
}

.viewer-select {
    padding: 8px 14px;
    border-radius: var(--border-radius-md);
    border: 2px solid var(--bg-tertiary);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    cursor: pointer;
    transition: border-color var(--transition-fast);
    min-width: 160px;
}

.viewer-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.viewer-mode-btns {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
}

.viewer-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 7px 15px;
    border-radius: var(--border-radius-md);
    border: 2px solid var(--bg-tertiary);
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
    line-height: 1.3;
}

.viewer-btn small {
    display: block;
    font-size: 11px;
    opacity: 0.75;
    font-weight: 400;
}

.viewer-btn .vbtn-icon {
    font-style: normal;
    opacity: 0.8;
}

.viewer-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--bg-secondary);
    transform: translateY(-1px);
}

.viewer-btn.active {
    background: var(--gradient-primary);
    color: white;
    border-color: transparent;
    box-shadow: var(--shadow-sm);
}

/* Canvas container */
.viewer-wrapper {
    position: relative;
    width: 100%;
    /* height is set responsively below via clamp() */
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    background: #e8ecf4;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(0,0,0,0.06);
}

body.dark-mode .viewer-wrapper {
    background: #141828;
    border-color: rgba(255,255,255,0.05);
}

/* Sketch tab: warm parchment background */
#viz_3d .viewer-wrapper {
    background: #f4f1ec;
    box-shadow: 0 6px 32px rgba(80, 60, 20, 0.10);
}

body.dark-mode #viz_3d .viewer-wrapper {
    background: #12121e;
    box-shadow: 0 6px 32px rgba(0,0,0,0.5);
}

.viewer-canvas {
    width: 100% !important;
    height: 100% !important;
    display: block;
    touch-action: none;
}

/* Loading overlay */
.viewer-loading {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 14px;
    background: rgba(232, 236, 244, 0.90);
    font-size: 15px;
    color: var(--text-secondary);
    z-index: 10;
    backdrop-filter: blur(4px);
    border-radius: var(--border-radius-lg);
}

body.dark-mode .viewer-loading {
    background: rgba(14, 14, 28, 0.90);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--bg-tertiary);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.75s linear infinite;
    flex-shrink: 0;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Legend strip */
.viewer-legend {
    margin-top: 10px;
    min-height: 28px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
}

.legend-row {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.legend-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 13px;
}

.legend-swatches {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin-top: 2px;
}

.swatch {
    display: inline-block;
    width: 13px;
    height: 13px;
    border-radius: 3px;
    vertical-align: middle;
    flex-shrink: 0;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.swatch-label {
    font-size: 12px;
    color: var(--text-muted);
}

/* Info bar below sketch viewer */
.viewer-info {
    margin-top: 8px;
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
}

/* ==========================================
   IN-CANVAS ANNOTATION PANEL
   ========================================== */

.viewer-annot-panel {
    position: absolute;
    top: 10px;
    left: 10px;
    z-index: 15;
    background: rgba(8, 8, 18, 0.78);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 11px;
    padding: 9px 13px 10px;
    color: rgba(255, 255, 255, 0.92);
    font-size: 13px;
    line-height: 1.4;
    user-select: none;
    min-width: 122px;
    pointer-events: all;
}

.vap-group { display: flex; flex-direction: column; gap: 3px; }

.vap-title {
    font-size: 10.5px;
    font-weight: 700;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.48);
    margin-bottom: 4px;
}

/* colored vap-title variants per section */
.vap-title.vap-title--mesh   { color: #4cc9f0; }
.vap-title.vap-title--annot  { color: #a78bfa; }
.vap-title.vap-title--lang   { color: #fb8500; }

.vap-row {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 2px 0;
    cursor: pointer;
    transition: color 0.15s;
    font-size: 13px;
}

.vap-row:hover { color: #fff; }

.vap-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--c, #888);
    flex-shrink: 0;
    box-shadow: 0 0 5px var(--c, transparent);
}

.vap-sep {
    height: 1px;
    background: rgba(255, 255, 255, 0.12);
    margin: 7px 0 5px;
}

.vap-row input[type="radio"],
.vap-row input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: #4361ee;
    cursor: pointer;
    flex-shrink: 0;
    margin: 0;
}

/* Mesh-type row inside toolbar */
.viewer-mesh-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ==========================================
   SPLIT-VIEW DIVIDER
   ========================================== */

.viewer-divider {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 36px;          /* hit-area width */
    cursor: ew-resize;
    z-index: 20;
    display: flex;
    flex-direction: column;
    align-items: center;
    touch-action: none;
    user-select: none;
}

.viewer-divider-line {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    background: rgba(255, 255, 255, 0.85);
    box-shadow: 0 0 6px rgba(0, 0, 0, 0.45);
    pointer-events: none;
}

body.dark-mode .viewer-divider-line {
    background: rgba(255, 255, 255, 0.70);
}

.viewer-divider-handle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 34px;
    height: 34px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.35);
    font-size: 15px;
    color: #333;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    pointer-events: none;
}

body.dark-mode .viewer-divider-handle {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.viewer-divider:hover .viewer-divider-handle {
    transform: translate(-50%, -50%) scale(1.12);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.45);
}

/* Corner labels */
.viewer-split-label {
    position: absolute;
    bottom: 10px;
    background: rgba(0, 0, 0, 0.45);
    color: rgba(255, 255, 255, 0.92);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.5px;
    padding: 3px 9px;
    border-radius: 20px;
    pointer-events: none;
    z-index: 15;
    backdrop-filter: blur(4px);
}

.viewer-split-label.label-left  { left:  10px; }
.viewer-split-label.label-right { right: 10px; }

/* ==========================================
   RESPONSIVE — Viewer
   ========================================== */

/* Fluid canvas height */
.viewer-wrapper {
    height: clamp(280px, 42vw, 560px);
}

@media (max-width: 767px) {
    .viewer-wrapper {
        height: clamp(240px, 62vw, 380px);
    }

    .viewer-toolbar {
        gap: 6px;
    }

    .viewer-mode-btns {
        gap: 5px;
    }

    .viewer-btn {
        padding: 5px 9px;
        font-size: 11px;
        gap: 3px;
    }

    .viewer-btn small {
        font-size: 10px;
    }

    .viewer-select {
        min-width: 100px;
        font-size: 12px;
        padding: 6px 10px;
    }

    .viewer-select-label {
        font-size: 12px;
    }

    .viewer-mesh-row {
        gap: 6px;
    }

    .viewer-divider-handle {
        width: 28px;
        height: 28px;
        font-size: 13px;
    }

    .viewer-split-label {
        font-size: 10px;
        padding: 2px 7px;
        bottom: 7px;
    }

    .legend-label {
        font-size: 11px;
    }

    .swatch-label {
        font-size: 10px;
    }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .viewer-wrapper {
        height: clamp(320px, 44vw, 480px);
    }

    .viewer-btn {
        padding: 6px 11px;
        font-size: 12px;
    }
}

/* ==========================================
   A2Z-10M+ TITLE FONT
   ========================================== */

.title-a2z {
    font-family: 'Grechen Fuemen', cursive;
    font-size: 1.15em;
    letter-spacing: 0.01em;
}

.t-A    { color: #f72585; }   /* pink */
.t-2    { color: #4361ee; }   /* blue */
.t-Z    { color: #fb8500; }   /* orange */
.t-dash { color: var(--text-primary); }
.t-10M  { color: #e63946; }   /* red */

/* ==========================================
   CAPTION + TAGS IN-CANVAS OVERLAY (top-right)
   ========================================== */

.viewer-caption-overlay {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 15;
    width: 260px;
    max-height: 58%;
    overflow-y: auto;
    background: rgba(6, 6, 16, 0.82);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.11);
    border-radius: 14px;
    padding: 12px 14px 13px;
    color: rgba(255, 255, 255, 0.90);
    pointer-events: all;
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.2) transparent;
}

.viewer-caption-overlay::-webkit-scrollbar {
    width: 4px;
}
.viewer-caption-overlay::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.18);
    border-radius: 4px;
}

.cp-title {
    font-family: 'Grechen Fuemen', cursive;
    font-size: 15px;
    font-weight: 700;
    background: linear-gradient(90deg, #00d4ff, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
    padding-bottom: 7px;
    border-bottom: 1px solid rgba(0, 212, 255, 0.18);
}

.cp-caption-text {
    font-size: 13px;
    line-height: 1.75;
    color: rgba(255, 255, 255, 0.88);
    margin-bottom: 10px;
    text-align: justify;
    hyphens: auto;
}

.cp-tags-label {
    font-family: 'Grechen Fuemen', cursive;
    font-size: 13px;
    background: linear-gradient(90deg, #fb8500, #f72585);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}

.cp-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.cp-tag {
    display: inline-block;
    padding: 1px 7px;
    background: rgba(0, 212, 255, 0.10);
    border: 1px solid rgba(0, 212, 255, 0.30);
    border-radius: 12px;
    font-size: 10px;
    color: rgba(190, 230, 255, 0.85);
    font-weight: 500;
    letter-spacing: 0.15px;
    line-height: 1.7;
}

.cp-placeholder {
    display: block;
    text-align: center;
    color: rgba(0, 212, 255, 0.55);
    font-style: italic;
    font-size: 11px;
    border: 2.5px solid rgba(0, 212, 255, 0.45);
    border-radius: 8px;
    padding: 5px 10px;
    width: 100%;
    box-sizing: border-box;
    background: rgba(0, 212, 255, 0.04);
    margin-top: 4px;
}

@media (max-width: 767px) {
    .viewer-caption-overlay {
        width: 200px;
        font-size: 10px;
    }
}

/* ==========================================
   LEGEND SWATCH LABELS — reduced size
   ========================================== */

.swatch {
    width: 11px;
    height: 11px;
}

.swatch-label {
    font-size: 11px;
}

/* ==========================================
   SKETCH INFO BAR — improved
   ========================================== */

.viewer-info {
    margin-top: 10px;
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
    letter-spacing: 0.3px;
    font-style: italic;
}

/* ==========================================
   SKETCH TAB — artistic panel style
   ========================================== */

#viz_3d .viewer-toolbar {
    border-bottom: 1px solid var(--bg-tertiary);
    padding-bottom: 10px;
    margin-bottom: 4px;
}

#viz_3d .viewer-btn.active {
    background: linear-gradient(135deg, #a0522d 0%, #d2691e 100%);
}

/* Subtle vignette ring around sketch canvas */
#viz_3d .viewer-wrapper::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--border-radius-lg);
    box-shadow: inset 0 0 60px rgba(0,0,0,0.08);
    pointer-events: none;
    z-index: 1;
}

body.dark-mode #viz_3d .viewer-wrapper::after {
    box-shadow: inset 0 0 80px rgba(0,0,0,0.35);
}

/* ==========================================
   OVERALL AESTHETIC POLISH
   ========================================== */

/* Viewer tab content spacing */
#viz-container .tabcontent {
    padding-top: 4px;
}

/* Improve tab description spans */
.tabcontent > span:first-child {
    display: block;
    font-size: 13.5px;
    color: var(--text-muted);
    margin-bottom: 14px;
    line-height: 1.6;
    padding: 10px 14px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    border-left: 3px solid var(--primary-color);
}

/* ==========================================
   CONTACT FORM
   ========================================== */

.contact-intro {
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.contact-form {
    max-width: 760px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.contact-field label {
    font-weight: 600;
    font-size: 16px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.contact-field .required {
    color: #e74c3c;
    font-weight: 700;
}

.contact-field .optional-badge {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
    padding: 2px 7px;
}

.contact-field input,
.contact-field textarea {
    width: 100%;
    padding: 14px 18px;
    font-size: 16px;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1.5px solid var(--bg-tertiary);
    border-radius: var(--border-radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    outline: none;
    resize: vertical;
}

.contact-field input::placeholder,
.contact-field textarea::placeholder {
    color: var(--text-muted);
}

.contact-field input:focus,
.contact-field textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.12);
}

.contact-submit-row {
    display: flex;
    justify-content: flex-end;
    margin-top: 8px;
}

.contact-submit-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    font-size: 17px;
    font-weight: 600;
    font-family: inherit;
    color: white;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border: none;
    border-radius: var(--border-radius-xl);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.contact-submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

/* ===================== Lightbox ===================== */
.lightbox-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(0, 0, 0, 0.92);
    align-items: center;
    justify-content: center;
    cursor: zoom-out;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    animation: lightbox-fade-in 0.2s ease;
}

.lightbox-overlay.active {
    display: flex;
}

.lightbox-overlay img {
    max-width: 92vw;
    max-height: 92vh;
    object-fit: contain;
    border-radius: 6px;
    box-shadow: 0 8px 48px rgba(0,0,0,0.6);
    cursor: zoom-out;
    animation: lightbox-zoom-in 0.22s cubic-bezier(0.22, 1, 0.36, 1);
    user-select: none;
}

.lightbox-close {
    position: fixed;
    top: 18px;
    right: 24px;
    color: #fff;
    font-size: 36px;
    line-height: 1;
    cursor: pointer;
    opacity: 0.8;
    transition: opacity 0.15s;
    z-index: 10000;
    background: none;
    border: none;
    padding: 4px 8px;
}

.lightbox-close:hover {
    opacity: 1;
}

@keyframes lightbox-fade-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@keyframes lightbox-zoom-in {
    from { transform: scale(0.88); opacity: 0; }
    to   { transform: scale(1);    opacity: 1; }
}

img.lightbox-enabled {
    cursor: zoom-in;
}