/* Reset & Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Outfit', 'Noto Sans KR', sans-serif;
}

:root {
    /* Color Palette - Premium Dark Green Theme */
    --color-bg: #0b0f0d;
    --color-card-bg: rgba(20, 26, 23, 0.85);
    --color-border: rgba(34, 47, 42, 0.6);
    --color-border-hover: rgba(0, 255, 170, 0.4);
    
    --color-primary: #006747;
    --color-primary-hover: #00845a;
    --color-primary-glow: rgba(0, 103, 71, 0.35);
    
    --color-accent: #00ffaa;
    --color-accent-dim: rgba(0, 255, 170, 0.1);
    
    --color-text-main: #e4ede9;
    --color-text-sub: #8ea39b;
    --color-text-muted: #576d65;
    
    --color-danger: #ff4d4d;
    --color-danger-bg: rgba(255, 77, 77, 0.1);
    --color-danger-border: rgba(255, 77, 77, 0.3);
    
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
    
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    background-color: var(--color-bg);
    color: var(--color-text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(0, 103, 71, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(0, 255, 170, 0.08) 0%, transparent 40%);
}

.app-container {
    width: 100%;
    max-width: 1400px;
    min-height: 100vh;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

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

.header-logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-img {
    height: 48px;
    width: auto;
    filter: drop-shadow(0 0 8px var(--color-primary-glow));
}

.logo-text {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #ffffff 0%, var(--color-text-sub) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-highlight {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-primary-hover) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 900;
}

.header-desc {
    color: var(--color-text-sub);
    font-size: 0.95rem;
    font-weight: 400;
    border-left: 2px solid var(--color-primary);
    padding-left: 1rem;
}

/* Workspace Layout */
.app-workspace {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 2rem;
    flex: 1;
}

@media (max-width: 1024px) {
    .app-workspace {
        grid-template-columns: 1fr;
    }
}

/* Card Common */
.card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow-md);
    transition: var(--transition-smooth);
    overflow: hidden;
}

.card:hover {
    border-color: rgba(34, 47, 42, 0.9);
}

/* Viewer Section */
.viewer-section {
    display: flex;
    flex-direction: column;
}

.viewer-card {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 500px;
    position: relative;
    padding: 1.5rem;
}

/* Dropzone Styles */
.dropzone {
    width: 100%;
    height: 100%;
    min-height: 460px;
    border: 2px dashed var(--color-border);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-smooth);
    padding: 2rem;
    background: rgba(20, 26, 23, 0.4);
}

.dropzone.dragover {
    border-color: var(--color-accent);
    background: var(--color-accent-dim);
    box-shadow: 0 0 20px var(--color-accent-dim);
}

.dropzone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.2rem;
}

.upload-icon-wrapper {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: rgba(0, 103, 71, 0.1);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.2rem;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
    transition: var(--transition-smooth);
}

.dropzone:hover .upload-icon-wrapper {
    transform: translateY(-5px);
    background: rgba(0, 255, 170, 0.15);
    box-shadow: 0 0 15px rgba(0, 255, 170, 0.2);
}

.dropzone h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-text-main);
}

.dropzone p {
    font-size: 0.9rem;
    color: var(--color-text-sub);
    max-width: 320px;
}

/* Workspace Area */
.workspace-area {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.canvas-wrapper {
    max-width: 100%;
    max-height: 70vh;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 8px;
    overflow: auto;
    box-shadow: var(--shadow-sm);
    background: #000;
}

#editor-canvas {
    max-width: 100%;
    max-height: 70vh;
    display: block;
    cursor: none;
}

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(11, 15, 13, 0.85);
    backdrop-filter: blur(8px);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
}

.spinner-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(0, 255, 170, 0.1);
    border-top: 3px solid var(--color-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

#loading-text {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--color-accent);
    letter-spacing: 0.5px;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* Control Section */
.control-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.control-card {
    border-radius: 16px;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1.2rem 1.5rem;
    border-bottom: 1px solid var(--color-border);
    background: rgba(0, 103, 71, 0.05);
}

.card-header i {
    color: var(--color-accent);
    font-size: 1.2rem;
}

.card-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.2px;
}

.card-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

/* Control Items (Toggle Row) */
.control-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 0.5rem 0;
}

.control-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    flex: 1;
}

.control-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text-main);
}

.control-description {
    font-size: 0.8rem;
    color: var(--color-text-sub);
}

/* Toggle Switch Component */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 26px;
    flex-shrink: 0;
}

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

.toggle-switch .slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-border);
    transition: .3s;
    border-radius: 34px;
}

.toggle-switch .slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s;
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
}

.toggle-switch input:checked + .slider {
    background-color: var(--color-primary);
    box-shadow: 0 0 8px var(--color-primary-glow);
}

.toggle-switch input:checked + .slider:before {
    transform: translateX(22px);
    background-color: var(--color-accent);
}

/* Control Groups */
.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.group-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-sub);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Segmented Control */
.segmented-control {
    display: flex;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    padding: 3px;
    border: 1px solid var(--color-border);
}

.segmented-control input[type="radio"] {
    display: none;
}

.segmented-item {
    flex: 1;
    text-align: center;
    padding: 0.6rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-sub);
    cursor: pointer;
    border-radius: 6px;
    transition: var(--transition-smooth);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
}

.segmented-control input[type="radio"]:checked + .segmented-item {
    background: var(--color-primary);
    color: #fff;
    box-shadow: var(--shadow-sm);
}

/* Range Slider Styles */
.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.badge {
    background: rgba(0, 255, 170, 0.1);
    color: var(--color-accent);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    border: 1px solid rgba(0, 255, 170, 0.2);
}

.range-slider {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--color-border);
    outline: none;
    margin: 0.5rem 0;
}

.range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-accent);
    cursor: pointer;
    box-shadow: 0 0 8px rgba(0, 255, 170, 0.5);
    transition: var(--transition-smooth);
}

.range-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* Manual Tools (Brush / Eraser) */
.manual-tools {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.8rem;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-sub);
}

.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-text-main);
}

.btn-outline.active {
    background: rgba(0, 103, 71, 0.15);
    border-color: var(--color-primary);
    color: var(--color-accent);
    box-shadow: inset 0 0 6px rgba(0, 255, 170, 0.05);
}

.tool-hint {
    font-size: 0.75rem;
    color: var(--color-text-sub);
    line-height: 1.4;
    display: flex;
    gap: 0.4rem;
}

.tool-hint i {
    color: var(--color-accent);
    margin-top: 2px;
}

.divider {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 0.5rem 0;
}

/* Common Button Styles */
.btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    gap: 0.6rem;
    padding: 0.75rem 1.2rem;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: 1px solid transparent;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, #005036 100%);
    color: #fff;
    box-shadow: 0 4px 12px var(--color-primary-glow);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-primary-hover) 0%, var(--color-primary) 100%);
    box-shadow: 0 6px 16px rgba(0, 103, 71, 0.5);
    border-color: rgba(0, 255, 170, 0.2);
}

.btn-secondary {
    background: #19221e;
    border-color: var(--color-border);
    color: var(--color-text-main);
}

.btn-secondary:hover {
    background: #232f2a;
    border-color: var(--color-text-sub);
}

.btn-danger-outline {
    background: var(--color-danger-bg);
    border-color: var(--color-danger-border);
    color: var(--color-danger);
}

.btn-danger-outline:hover {
    background: var(--color-danger);
    color: #fff;
    box-shadow: 0 4px 12px rgba(255, 77, 77, 0.25);
}

.btn-large {
    padding: 1rem 1.5rem;
    font-size: 1.05rem;
    border-radius: 10px;
}

.btn-upload {
    margin-top: 0.5rem;
}

.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

/* Footer Styling */
.app-footer {
    text-align: center;
    border-top: 1px solid var(--color-border);
    padding-top: 1.5rem;
    margin-top: auto;
}

.app-footer p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* AI Status Summary Styling */
.ai-status-summary {
    display: flex;
    gap: 0.8rem;
    margin-top: 1rem;
    padding-top: 0;
    border-top: none;
}

.status-badge {
    flex: 1;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    background: rgba(0, 103, 71, 0.08);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 0.8rem;
    color: var(--color-text-main);
}

.status-badge i {
    color: var(--color-accent);
}

.status-badge strong {
    color: var(--color-accent);
    font-weight: 700;
}

/* CSS Accelerated Custom Pointer Circle Overlay */
.custom-cursor {
    position: fixed;
    pointer-events: none; /* Let pointer events pass through to canvas */
    border: 2px dashed rgba(0, 255, 170, 0.8);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    z-index: 10000;
    display: none; /* Hidden by default */
    box-sizing: border-box;
    transition: width 0.05s ease, height 0.05s ease;
    box-shadow: 0 0 6px rgba(0, 255, 170, 0.2);
}

.custom-cursor.eraser-mode {
    border-color: rgba(255, 77, 77, 0.9);
    box-shadow: 0 0 6px rgba(255, 77, 77, 0.2);
}