/* --- Modern Dark Theme Overhaul --- */

/* 1. Imports & Root Variables */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    --bg-primary: #0f1114;
    --bg-secondary: #1a1d23;
    --bg-tertiary: #252932;
    --bg-quaternary: #2d3139;
    --text-primary: #ffffff;
    --text-secondary: #b8bcc8;
    --text-tertiary: #8b9099;
    --accent-primary: #2196f3;
    --accent-primary-darker: #1976d2;
    --accent-primary-light: #42a5f5;
    --accent-secondary: #424955;
    --accent-success: #4caf50;
    --accent-success-darker: #388e3c;
    --accent-warning: #ff9800;
    --accent-danger: #f44336;
    --accent-danger-darker: #d32f2f;
    --border-color: #3a404a;
    --border-light: #525862;
    --shadow-color: rgba(0, 0, 0, 0.4);
    --shadow-light: rgba(0, 0, 0, 0.15);
    --gradient-primary: linear-gradient(135deg, #2196f3, #21cbf3);
    --gradient-card: linear-gradient(145deg, #1a1d23, #252932);
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* 2. General Body & Layout Styles */
body {
    font-family: var(--font-main);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.main-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 25px;
}

.main-header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 25px;
    border-bottom: 1px solid var(--border-color);
}

.main-header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin: 0;
    letter-spacing: -1.5px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 4px 12px rgba(33, 150, 243, 0.3);
}

.main-header p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 10px auto 0;
}

.editor-layout {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    align-items: flex-start;
}

.canvas-wrapper {
    flex: 3;
    min-width: 500px;
}

.controls-panel {
    flex: 1;
    min-width: 380px;
    background: var(--gradient-card);
    padding: 30px;
    border-radius: 16px;
    border: 1px solid var(--border-light);
    box-shadow: 0 20px 40px var(--shadow-color), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
}

/* 3. Editor Area & Canvas */
.editor-area {
    border: 2px dashed var(--border-color);
    border-radius: 16px;
    min-height: 600px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--gradient-card);
    position: relative;
    overflow: hidden;
    transition: all 0.4s ease;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.2);
}

.editor-area:hover {
    border-color: var(--accent-primary);
}

.editor-area.dragover {
    border-color: var(--accent-success);
    background-color: var(--bg-tertiary);
}

.placeholder-text {
    color: var(--text-secondary);
    text-align: center;
    padding: 20px;
}

canvas {
    max-width: 100%;
    height: auto;
    display: none;
    cursor: default;
    border-radius: 8px;
}

canvas.redact-mode {
    cursor: crosshair;
}

/* 4. Control Panel Sections */
.control-section {
    margin-bottom: 30px;
}
.control-section:last-child {
    margin-bottom: 0;
}

.control-section h4 {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.15rem;
    font-weight: 600;
    margin-top: 0;
    margin-bottom: 24px;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-light);
    padding-bottom: 16px;
    position: relative;
}
.control-section h4::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 32px;
    width: 40px;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 1px;
}
.control-section h4 svg {
    width: 20px;
    height: 20px;
    fill: var(--accent-primary);
}

label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 5. Inputs, Selects, and Sliders */
input[type="file"],
input[type="text"],
select {
    width: 100%;
    padding: 12px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    box-sizing: border-box;
    margin-bottom: 15px;
    color: var(--text-primary);
    font-family: var(--font-main);
    transition: border-color 0.2s, box-shadow 0.2s;
}
input[type="file"] {
    padding: 10px;
}
input[type="file"]::file-selector-button {
    background-color: var(--accent-secondary);
    color: var(--text-primary);
    border: none;
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s;
}
input[type="file"]::file-selector-button:hover {
    background-color: var(--bg-tertiary);
}

input:focus, select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(0, 170, 255, 0.2);
}

.slider-group {
    margin-bottom: 20px;
}
.slider-group label {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.slider-group span {
    font-weight: 600;
    color: var(--text-primary);
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    outline: none;
    margin-top: 10px;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent-primary);
    cursor: pointer;
    border-radius: 50%;
    border: 2px solid var(--bg-secondary);
    transition: background-color 0.2s;
}
input[type="range"]::-webkit-slider-thumb:hover {
    background-color: var(--accent-primary-darker);
}
input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--accent-primary);
    cursor: pointer;
    border-radius: 50%;
    border: 2px solid var(--bg-secondary);
}

/* 6. Buttons */
.tool-btn, .tool-btn-secondary, .download-btn {
    width: 100%;
    padding: 14px 20px;
    border: 1px solid transparent;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    position: relative;
    overflow: hidden;
}
.tool-btn svg, .tool-btn-secondary svg, .download-btn svg {
    width: 18px;
    height: 18px;
}

.tool-btn {
    background-color: var(--accent-secondary);
    color: var(--text-primary);
    border-color: var(--border-color);
}
.tool-btn:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--accent-secondary);
}
.tool-btn.active {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
    border-color: var(--accent-primary);
}
.tool-btn.active:hover {
    background-color: var(--accent-primary-darker);
}

.tool-btn-secondary {
    background-color: transparent;
    color: var(--accent-danger);
    border: 1px solid var(--accent-danger);
}
.tool-btn-secondary:hover {
    background-color: var(--accent-danger);
    color: var(--text-primary);
}

.download-btn {
    background: linear-gradient(135deg, var(--accent-success), #66bb6a);
    color: var(--text-primary);
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}
.download-btn:hover {
    background: linear-gradient(135deg, var(--accent-success-darker), var(--accent-success));
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(76, 175, 80, 0.4);
}
.download-btn::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;
}
.download-btn:hover::before {
    left: 100%;
}

/* 7. Radio Buttons */
.radio-group {
    display: flex;
    gap: 15px;
    align-items: center;
    background-color: var(--bg-primary);
    padding: 10px;
    border-radius: 6px;
}
.radio-group input[type="radio"] {
    display: none;
}
.radio-group label {
    flex: 1;
    margin: 0;
    padding: 10px;
    border-radius: 4px;
    text-align: center;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
    color: var(--text-secondary);
}
.radio-group input[type="radio"]:checked + label {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
    font-weight: 600;
}
.radio-group label:hover {
    background-color: var(--bg-tertiary);
}

/* 8. Responsive Adjustments */
@media (max-width: 992px) {
    .editor-layout {
        flex-direction: column;
    }
    .controls-panel {
        min-width: unset;
        width: 100%;
        box-sizing: border-box;
    }
}

/* 9. Footer and Utility Styles */
.main-footer {
    margin-top: 40px;
    text-align: center;
    border-top: 1px solid var(--border-color);
    padding-top: 25px;
    color: var(--text-secondary);
}

.main-footer a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s;
}
.main-footer a:hover {
    color: var(--accent-primary-darker);
}

.main-footer .open-source-notice {
    font-size: 0.9rem;
    margin-top: 10px;
}

kbd {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 3px 6px;
    font-family: monospace;
    font-size: 0.85em;
    color: var(--text-primary);
}