:root {
    --bg-color: #1e1e2e;
    --text-color: #cdd6f4;
    --header-bg: #11111b;
    --toolbar-bg: #181825;
    --border-color: #313244;
    --canvas-bg: #313244;
    --canvas-shadow: rgba(0,0,0,0.8);
    --btn-bg: #313244;
    --btn-hover: #45475a;
    --input-bg: #1e1e2e;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
}

header {
    background-color: var(--header-bg);
    padding: 20px 30px;
    border-bottom: 1px solid var(--border-color);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    margin: 0;
    font-size: 1.4rem; 
    color: #89b4fa;
}

.toolbar {
    background-color: var(--toolbar-bg);
    padding: 15px 30px;
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

.tool-group {
    display: flex;
    align-items: center;
    gap: 15px;
}

.separator {
    border-left: 2px solid var(--border-color);
    padding-left: 30px;
}

.download-group {
    flex-grow: 1; 
    justify-content: flex-end;
}

.btn {
    padding: 10px 18px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    font-size: 1rem;
    background-color: var(--btn-bg);
    color: var(--text-color);
    transition: all 0.2s;
}

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

.btn:hover:not(:disabled) { 
    background-color: var(--btn-hover); 
}

.btn-primary { 
    background-color: #89b4fa; 
    color: #11111b; 
    border: none;
}
.btn-primary:hover:not(:disabled) { 
    background-color: #74c7ec; 
}

.btn-success { 
    background-color: #a6e3a1; 
    color: #11111b; 
    border: none;
}
.btn-success:hover:not(:disabled) { 
    background-color: #94e2d5; 
}

.btn-icon {
    font-size: 1.6rem;
    padding: 6px 14px;
    line-height: 1;
}

#filename {
    padding: 10px 15px;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--input-bg);
    color: var(--text-color);
    min-width: 400px; 
    transition: border-color 0.2s;
}

#filename:focus {
    outline: none;
    border-color: #89b4fa;
}

#brush-size {
    width: 150px;
    cursor: pointer;
}

#brush-size-display {
    min-width: 40px;
    text-align: right;
}

.workspace {
    padding: 40px 20px;
    display: flex;
    justify-content: center;
}

#pages-container {
    display: flex;
    flex-direction: column;
    gap: 40px;
    align-items: center;
}

.canvas-wrapper {
    position: relative;
    box-shadow: 0 10px 30px var(--canvas-shadow);
    background-color: white;
    border-radius: 4px;
    overflow: hidden;
}

canvas {
    display: block;
    cursor: crosshair;
}

.placeholder-text {
    font-size: 1.3rem;
    color: #a6adc8;
    margin-top: 50px;
}

#brush-color {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 38px;
    height: 38px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    padding: 0;
    background: none;
    transition: 0.2s;
}

#brush-color:hover {
    border-color: #89b4fa;
}

#brush-color::-webkit-color-swatch-wrapper {
    padding: 3px;
}

#brush-color::-webkit-color-swatch {
    border-radius: 4px;
    border: none;
}

#brush-color::-moz-color-swatch {
    border-radius: 4px;
    border: none;
}