/* ===== CSS Variables ===== */
:root {
    /* UI Farben - Dunkles Theme für bessere Sichtbarkeit */
    --ui-bg-dark: #0d1117;
    --ui-bg-panel: #161b22;
    --ui-bg-input: #21262d;
    --ui-border: #30363d;
    --ui-border-focus: #58a6ff;
    
    /* Text */
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    
    /* Akzentfarben */
    --accent-blue: #58a6ff;
    --accent-green: #3fb950;
    --accent-orange: #d29922;
    --accent-red: #f85149;
    --accent-purple: #a371f7;
    
    /* Buttons */
    --btn-primary-bg: #238636;
    --btn-primary-hover: #2ea043;
    --btn-secondary-bg: #21262d;
    --btn-secondary-hover: #30363d;
    --btn-accent-bg: #1f6feb;
    --btn-accent-hover: #388bfd;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    background: var(--ui-bg-dark);
    min-height: 100vh;
    color: var(--text-primary);
}

.container {
    max-width: 1900px;
    margin: 0 auto;
    padding: 16px;
}

header {
    text-align: center;
    padding: 16px 0;
    border-bottom: 1px solid var(--ui-border);
    margin-bottom: 16px;
}

header h1 {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

header h1 span {
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.main-content {
    display: grid;
    grid-template-columns: 360px 1fr;
    gap: 16px;
    align-items: start;
}

/* ===== Controls Panel ===== */
.controls-panel {
    background: var(--ui-bg-panel);
    border-radius: 6px;
    border: 1px solid var(--ui-border);
    position: sticky;
    top: 16px;
    max-height: calc(100vh - 32px);
    overflow-y: auto;
}

.controls-panel::-webkit-scrollbar {
    width: 8px;
}

.controls-panel::-webkit-scrollbar-track {
    background: transparent;
}

.controls-panel::-webkit-scrollbar-thumb {
    background: var(--ui-border);
    border-radius: 4px;
}

.controls-panel::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

.panel-header {
    padding: 12px 16px;
    border-bottom: 1px solid var(--ui-border);
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ===== Control Groups ===== */
.control-group {
    padding: 12px 16px;
    border-bottom: 1px solid var(--ui-border);
}

.control-group:last-child {
    border-bottom: none;
}

.control-group h3 {
    color: var(--text-primary);
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.control-group h3 .icon {
    font-size: 1rem;
}

/* ===== Labels ===== */
label {
    display: block;
    margin-bottom: 4px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

label span {
    color: var(--accent-blue);
    font-weight: 500;
    font-family: 'SF Mono', Monaco, 'Courier New', monospace;
}

/* ===== Range Inputs ===== */
input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--ui-bg-input);
    outline: none;
    margin-bottom: 12px;
    -webkit-appearance: none;
    appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-blue);
    cursor: pointer;
    border: 2px solid var(--ui-bg-panel);
    transition: transform 0.15s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

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

/* ===== Color Inputs ===== */
input[type="color"] {
    width: 100%;
    height: 32px;
    border: 1px solid var(--ui-border);
    border-radius: 6px;
    cursor: pointer;
    margin-bottom: 10px;
    background: var(--ui-bg-input);
    padding: 2px;
}

input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

input[type="color"]::-webkit-color-swatch {
    border-radius: 4px;
    border: none;
}

/* ===== Select & Number Inputs ===== */
select, input[type="number"] {
    width: 100%;
    padding: 6px 10px;
    border: 1px solid var(--ui-border);
    border-radius: 6px;
    background: var(--ui-bg-input);
    color: var(--text-primary);
    font-size: 0.875rem;
    margin-bottom: 10px;
    outline: none;
    transition: border-color 0.15s;
}

select:focus, input[type="number"]:focus {
    border-color: var(--ui-border-focus);
}

select option {
    background: var(--ui-bg-panel);
    color: var(--text-primary);
}

/* ===== File Input ===== */
.file-drop-zone {
    border: 2px dashed var(--ui-border);
    border-radius: 6px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 10px;
}

.file-drop-zone:hover {
    border-color: var(--accent-blue);
    background: rgba(88, 166, 255, 0.05);
}

.file-drop-zone.has-file {
    border-color: var(--accent-green);
    background: rgba(63, 185, 80, 0.05);
}

.file-drop-zone .icon {
    font-size: 2rem;
    margin-bottom: 8px;
}

.file-drop-zone p {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.file-drop-zone input {
    display: none;
}

.image-info {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    background: rgba(63, 185, 80, 0.1);
    border-radius: 6px;
    font-size: 0.85rem;
    color: var(--accent-green);
    margin-bottom: 10px;
}

/* ===== Buttons ===== */
.button-group {
    display: flex;
    gap: 8px;
    padding: 12px 16px;
}

.btn {
    flex: 1;
    padding: 8px 14px;
    border: 1px solid transparent;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.btn.primary {
    background: var(--btn-primary-bg);
    color: white;
    border-color: var(--btn-primary-bg);
}

.btn.primary:hover {
    background: var(--btn-primary-hover);
}

.btn.secondary {
    background: var(--btn-secondary-bg);
    color: var(--text-primary);
    border-color: var(--ui-border);
}

.btn.secondary:hover {
    background: var(--btn-secondary-hover);
}

.btn.accent {
    background: var(--btn-accent-bg);
    color: white;
}

.btn.accent:hover {
    background: var(--btn-accent-hover);
}

.btn.small {
    padding: 4px 8px;
    font-size: 0.75rem;
}

/* ===== Checkbox ===== */
.checkbox-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
    cursor: pointer;
}

.checkbox-row input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--accent-blue);
    cursor: pointer;
}

.checkbox-row span {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* ===== Toggle ===== */
.toggle-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    padding: 8px 10px;
    background: var(--ui-bg-input);
    border-radius: 6px;
}

.toggle {
    position: relative;
    width: 40px;
    height: 22px;
    background: var(--ui-border);
    border-radius: 11px;
    cursor: pointer;
    transition: background 0.2s;
    flex-shrink: 0;
}

.toggle.active {
    background: var(--accent-green);
}

.toggle::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 18px;
    height: 18px;
    background: white;
    border-radius: 50%;
    transition: transform 0.2s;
}

.toggle.active::after {
    transform: translateX(18px);
}

.toggle-label {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* ===== Preview Panel ===== */
.preview-panel {
    background: var(--ui-bg-panel);
    border-radius: 6px;
    border: 1px solid var(--ui-border);
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - 140px);
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--ui-border);
}

.preview-header h2 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    background: rgba(63, 185, 80, 0.15);
    color: var(--accent-green);
}

.status-badge.objects {
    background: rgba(163, 113, 247, 0.15);
    color: var(--accent-purple);
}

/* ===== Canvas Container ===== */
.canvas-container {
    flex: 1;
    background: 
        linear-gradient(45deg, #1a1a1a 25%, transparent 25%),
        linear-gradient(-45deg, #1a1a1a 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #1a1a1a 75%),
        linear-gradient(-45deg, transparent 75%, #1a1a1a 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
    background-color: #0d0d0d;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    min-height: 450px;
}

#bgCanvas {
    position: absolute;
    max-width: 100%;
    max-height: 100%;
}

#polygonCanvas {
    position: relative;
    max-width: 100%;
    max-height: 100%;
    z-index: 1;
}

.preview-footer {
    padding: 10px 16px;
    border-top: 1px solid var(--ui-border);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* ===== Utility ===== */
.hidden {
    display: none !important;
}

.divider {
    height: 1px;
    background: var(--ui-border);
    margin: 8px 0;
}

/* ===== Responsive ===== */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 320px 1fr;
    }
}

@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .controls-panel {
        position: static;
        max-height: none;
    }
    
    .preview-panel {
        min-height: 500px;
    }
}

@media (max-width: 500px) {
    .container {
        padding: 10px;
    }
    
    .button-group {
        flex-direction: column;
    }
}