/* ==========================================================================
   MIIMIC - The Statistical Color Cloning Engine
   Design: Industrial, Mathematical, Minimal Dark Mode
   ========================================================================== */

:root {
    --bg-primary: #0F0F0F;
    --bg-secondary: #1A1A1A;
    --bg-tertiary: #252525;
    --bg-hover: #2A2A2A;
    --text-primary: #E8E6E3;
    --text-secondary: #888888;
    --text-muted: #555555;
    --accent-green: #00FF88;
    --accent-green-dim: #00CC6A;
    --accent-green-glow: rgba(0, 255, 136, 0.15);
    --accent-blue: #00D4FF;
    --border-color: #333333;
    --border-hover: #444444;
    --error-color: #FF4757;
    --warning-color: #FFA502;
    --success-color: #00FF88;
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    font-family: var(--font-mono);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   Layout
   ========================================================================== */

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 1920px;
    margin: 0 auto;
}

/* ==========================================================================
   Header
   ========================================================================== */

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-primary);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.15rem;
}

.logo-text {
    font-size: 1.75rem;
    font-weight: 300;
    letter-spacing: 0.4em;
    color: var(--text-primary);
}

.logo-highlight {
    color: var(--accent-green);
    text-shadow: 0 0 20px var(--accent-green-glow);
}

.logo-tagline {
    font-size: 0.6rem;
    letter-spacing: 0.2em;
    color: var(--text-muted);
    text-transform: uppercase;
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

.icon-button {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.icon-button:hover {
    border-color: var(--text-muted);
    color: var(--text-primary);
    background: var(--bg-secondary);
}

.icon-button svg {
    width: 20px;
    height: 20px;
}

/* ==========================================================================
   Main Content - Split View
   ========================================================================== */

.main-content {
    flex: 1;
    display: flex;
    padding: 1.5rem;
    gap: 1rem;
    min-height: 0;
}

.panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    min-width: 0;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    padding: 0 0.25rem;
}

.panel-left .panel-header {
    flex-direction: row;
}

.panel-right .panel-header {
    flex-direction: row-reverse;
}

.panel-label {
    font-size: 0.7rem;
    letter-spacing: 0.3em;
    color: var(--text-muted);
    text-transform: uppercase;
}

.panel-clear {
    width: 24px;
    height: 24px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all var(--transition-fast);
}

.panel:hover .panel-clear,
.drop-zone.has-image + .panel-clear,
.panel .panel-clear:focus {
    opacity: 1;
}

.drop-zone.has-image ~ .panel-header .panel-clear,
.panel:hover .panel-clear {
    opacity: 1;
}

.panel-clear:hover {
    background: var(--bg-tertiary);
    color: var(--error-color);
}

.panel-clear svg {
    width: 14px;
    height: 14px;
}

/* ==========================================================================
   Drop Zone
   ========================================================================== */

.drop-zone {
    flex: 1;
    position: relative;
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    overflow: hidden;
    transition: all var(--transition-normal);
    cursor: pointer;
    min-height: 300px;
}

.drop-zone:hover {
    border-color: var(--text-muted);
}

.drop-zone.drag-over {
    border-color: var(--accent-green);
    border-style: solid;
    background: var(--accent-green-glow);
}

.drop-zone.has-image {
    border-style: solid;
    cursor: default;
}

.drop-zone.has-image .drop-overlay {
    opacity: 0;
    pointer-events: none;
}

.drop-zone canvas {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.drop-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    transition: opacity var(--transition-normal);
    padding: 2rem;
}

.drop-icon {
    width: 48px;
    height: 48px;
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.drop-zone:hover .drop-icon {
    color: var(--text-secondary);
}

.drop-zone.drag-over .drop-icon {
    color: var(--accent-green);
}

.drop-icon svg {
    width: 100%;
    height: 100%;
}

.drop-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: center;
}

.drop-subtext {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-align: center;
}

.drop-hint {
    font-size: 0.6rem;
    color: var(--text-muted);
    padding: 0.25rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    margin-top: 0.5rem;
}

.image-info {
    position: absolute;
    bottom: 0.5rem;
    left: 0.5rem;
    font-size: 0.6rem;
    color: var(--text-muted);
    background: rgba(15, 15, 15, 0.8);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.drop-zone.has-image:hover .image-info {
    opacity: 1;
}

.compare-label {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
    font-weight: 300;
    letter-spacing: 0.3em;
    color: var(--accent-green);
    text-shadow: 0 0 30px var(--accent-green);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast);
}

.drop-zone.comparing .compare-label {
    opacity: 1;
}

/* ==========================================================================
   Center Control
   ========================================================================== */

.center-control {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 0 0.75rem;
    min-width: 130px;
}

/* Swap Button */
.swap-button {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.swap-button:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    background: rgba(0, 212, 255, 0.1);
}

.swap-button svg {
    width: 18px;
    height: 18px;
}

/* MIMIC Button */
.mimic-button {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    background: var(--bg-secondary);
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.mimic-glow {
    position: absolute;
    inset: -2px;
    border-radius: 50%;
    background: conic-gradient(
        from 0deg,
        transparent,
        var(--accent-green),
        transparent,
        var(--accent-green),
        transparent
    );
    opacity: 0;
    animation: none;
}

.mimic-button:not(:disabled):hover .mimic-glow {
    opacity: 0.3;
    animation: rotate 3s linear infinite;
}

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

.mimic-button:not(:disabled) {
    border-color: var(--accent-green-dim);
    color: var(--accent-green);
}

.mimic-button:not(:disabled):hover {
    border-color: var(--accent-green);
    box-shadow: 0 0 40px var(--accent-green-glow);
    transform: scale(1.05);
}

.mimic-button:not(:disabled):active {
    transform: scale(0.95);
}

.mimic-button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.mimic-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.mimic-icon svg {
    width: 28px;
    height: 28px;
}

.mimic-text {
    font-size: 0.6rem;
    letter-spacing: 0.15em;
    font-family: var(--font-mono);
}

/* Options Panel */
.options-panel {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    padding: 0.6rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.option-label {
    font-size: 0.5rem;
    letter-spacing: 0.15em;
    color: var(--text-muted);
    text-transform: uppercase;
}

.option-buttons {
    display: flex;
    gap: 0.25rem;
}

.option-btn {
    flex: 1;
    padding: 0.35rem 0.2rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.45rem;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.option-btn:hover {
    border-color: var(--text-muted);
    color: var(--text-secondary);
}

.option-btn.active {
    border-color: var(--accent-green);
    color: var(--accent-green);
    background: rgba(0, 255, 136, 0.1);
}

.option-toggles {
    display: flex;
    gap: 0.5rem;
}

.toggle-switch {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    cursor: pointer;
    flex: 1;
}

.toggle-switch input {
    display: none;
}

.toggle-slider {
    width: 28px;
    height: 14px;
    background: var(--bg-tertiary);
    border-radius: 7px;
    position: relative;
    transition: background var(--transition-fast);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 10px;
    height: 10px;
    background: var(--text-muted);
    border-radius: 50%;
    top: 2px;
    left: 2px;
    transition: all var(--transition-fast);
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--accent-green-dim);
}

.toggle-switch input:checked + .toggle-slider::before {
    left: 16px;
    background: var(--accent-green);
}

.toggle-label {
    font-size: 0.5rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.toggle-switch:hover .toggle-label {
    color: var(--text-secondary);
}

/* Intensity Control */
.intensity-control {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    width: 100%;
}

.intensity-control label {
    font-size: 0.55rem;
    letter-spacing: 0.15em;
    color: var(--text-muted);
}

.slider-container {
    position: relative;
    width: 100%;
    height: 20px;
    display: flex;
    align-items: center;
}

.intensity-control input[type="range"] {
    width: 100%;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: transparent;
    border-radius: 2px;
    outline: none;
    position: relative;
    z-index: 2;
}

.slider-track {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    height: 4px;
    background: linear-gradient(to right, #00FF88 0%, #00FF88 100%, #252525 100%, #252525 100%);
    /* JavaScript가 이 값을 동적으로 업데이트합니다 */
    border-radius: 2px;
    width: 100%;
    z-index: 1;
    pointer-events: none;
}

.intensity-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-green);
    cursor: pointer;
    transition: box-shadow var(--transition-fast);
    border: 2px solid var(--bg-primary);
}

.intensity-control input[type="range"]::-webkit-slider-thumb:hover {
    box-shadow: 0 0 12px var(--accent-green);
}

.intensity-control input[type="range"]::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-green);
    cursor: pointer;
    border: 2px solid var(--bg-primary);
}

.intensity-value {
    font-size: 0.75rem;
    color: var(--accent-green);
    font-weight: 500;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 0.5rem;
    width: 100%;
}

.action-button {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.5rem;
    letter-spacing: 0.05em;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    transition: all var(--transition-fast);
}

.action-button svg {
    width: 16px;
    height: 16px;
}

.action-button:not(:disabled):hover {
    border-color: var(--text-muted);
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.action-button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.compare-button:not(:disabled):hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

.compare-button.active {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    background: rgba(0, 212, 255, 0.1);
}

.reset-button:not(:disabled):hover {
    border-color: var(--warning-color);
    color: var(--warning-color);
}

/* Export Buttons */
.export-buttons {
    display: flex;
    gap: 0.5rem;
    width: 100%;
}

.export-button {
    flex: 1;
    padding: 0.6rem 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.55rem;
    letter-spacing: 0.05em;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    transition: all var(--transition-fast);
}

.export-button svg {
    width: 14px;
    height: 14px;
}

.export-button:not(:disabled):hover {
    border-color: var(--accent-green);
    color: var(--accent-green);
}

.export-button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.pro-badge {
    font-size: 0.45rem;
    padding: 0.1rem 0.25rem;
    background: var(--accent-green-dim);
    color: var(--bg-primary);
    border-radius: 2px;
    font-weight: 600;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 2rem;
    border-top: 1px solid var(--border-color);
    background: var(--bg-primary);
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.footer-philosophy {
    font-size: 0.65rem;
    color: var(--text-secondary);
}

.footer-copyright {
    font-size: 0.55rem;
    color: var(--text-muted);
}

.footer-shortcuts {
    display: flex;
    gap: 1rem;
}

.shortcut {
    font-size: 0.55rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.shortcut kbd {
    padding: 0.15rem 0.4rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 3px;
    font-family: var(--font-mono);
    font-size: 0.5rem;
}

/* ==========================================================================
   Toast Notifications
   ========================================================================== */

.toast-container {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 1000;
    pointer-events: none;
}

.toast {
    padding: 0.75rem 1.25rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    animation: toastIn 0.3s ease forwards;
    pointer-events: auto;
}

.toast.toast-out {
    animation: toastOut 0.3s ease forwards;
}

.toast.success {
    border-color: var(--success-color);
}

.toast.success::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--success-color);
    border-radius: 50%;
}

.toast.error {
    border-color: var(--error-color);
}

.toast.error::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--error-color);
    border-radius: 50%;
}

.toast.info {
    border-color: var(--accent-blue);
}

.toast.info::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--accent-blue);
    border-radius: 50%;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes toastOut {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-20px);
    }
}

/* ==========================================================================
   Processing Overlay
   ========================================================================== */

.processing-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 15, 15, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
    backdrop-filter: blur(4px);
}

.processing-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.processing-content {
    text-align: center;
    padding: 2rem;
}

.processing-spinner {
    width: 60px;
    height: 60px;
    margin: 0 auto 1.5rem;
}

.processing-spinner svg {
    width: 100%;
    height: 100%;
    animation: spin 1.5s linear infinite;
}

.processing-spinner circle {
    stroke: var(--accent-green);
    stroke-linecap: round;
    stroke-dasharray: 90, 150;
    stroke-dashoffset: 0;
    animation: dash 1.5s ease-in-out infinite;
}

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

@keyframes dash {
    0% {
        stroke-dasharray: 1, 150;
        stroke-dashoffset: 0;
    }
    50% {
        stroke-dasharray: 90, 150;
        stroke-dashoffset: -35;
    }
    100% {
        stroke-dasharray: 90, 150;
        stroke-dashoffset: -124;
    }
}

.processing-text {
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.processing-subtext {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.processing-progress {
    width: 200px;
    height: 3px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    margin: 0 auto;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--accent-green);
    width: 0%;
    transition: width 0.3s ease;
}

/* ==========================================================================
   Modal
   ========================================================================== */

.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1001;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}

.modal.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    transform: scale(0.95);
    transition: transform var(--transition-normal);
}

.modal.active .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
}

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.modal-close svg {
    width: 18px;
    height: 18px;
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
    max-height: calc(80vh - 60px);
}

.help-section {
    margin-bottom: 1.5rem;
}

.help-section:last-child {
    margin-bottom: 0;
}

.help-section h3 {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--accent-green);
    margin-bottom: 0.5rem;
}

.help-section p {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

@media (max-width: 1024px) {
    .main-content {
        flex-direction: column;
        padding: 1rem;
    }

    .panel {
        min-height: 250px;
    }

    .center-control {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        min-width: auto;
        padding: 1rem 0;
        gap: 0.75rem;
    }

    .swap-button {
        order: -1;
    }

    .mimic-button {
        width: 80px;
        height: 80px;
    }

    .intensity-control {
        width: 150px;
        order: 1;
    }

    .action-buttons,
    .export-buttons {
        width: auto;
    }

    .footer {
        flex-direction: column;
        gap: 0.75rem;
        text-align: center;
    }

    .footer-content {
        align-items: center;
    }

    .footer-shortcuts {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem 1rem;
    }
}

@media (max-width: 640px) {
    .header {
        padding: 0.75rem 1rem;
    }

    .logo-text {
        font-size: 1.25rem;
        letter-spacing: 0.25em;
    }

    .logo-tagline {
        font-size: 0.5rem;
        display: none;
    }

    .main-content {
        padding: 0.75rem;
        gap: 0.75rem;
    }

    .panel {
        min-height: 200px;
    }

    .drop-text {
        font-size: 0.8rem;
    }

    .drop-subtext {
        font-size: 0.6rem;
    }

    .drop-hint {
        display: none;
    }

    .center-control {
        gap: 0.5rem;
        padding: 0.75rem 0;
    }

    .mimic-button {
        width: 70px;
        height: 70px;
    }

    .mimic-icon svg {
        width: 24px;
        height: 24px;
    }

    .intensity-control {
        width: 120px;
    }

    .action-button,
    .export-button {
        padding: 0.4rem;
    }

    .action-button span,
    .export-button span:not(.pro-badge) {
        display: none;
    }

    .footer {
        padding: 0.75rem 1rem;
    }

    .footer-shortcuts {
        display: none;
    }
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ==========================================================================
   Animations
   ========================================================================== */

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}

/* Scanning effect for image loading */
.drop-zone.scanning::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(
        90deg,
        transparent,
        var(--accent-green),
        transparent
    );
    animation: scan 1.5s ease-in-out infinite;
}

@keyframes scan {
    0% { top: 0; opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { top: 100%; opacity: 0; }
}