:root {
    --primary-color: #6200ea;
    --bg-color: #f3f4f6;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    --text-color: #1f2937;
    --danger-color: #ef4444;
    --guide-color: rgba(0, 0, 0, 0.07);
    --guide-thickness: 1px;
    --guide-spacing-grid: 40px;
    --guide-spacing-lines: 36px;
}

@font-face {
    font-family: 'Elementarz2';
    src: url('elementarz2.ttf') format('truetype');
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
    /* Prevent selection while drawing */
    -webkit-user-select: none;
}

#whiteboard,
#toolbar {
    touch-action: none;
    /* Critical for touch drawing */
}

body,
html {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
}

#app-container {
    position: relative;
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
}

.bg-lines {
    background-image: repeating-linear-gradient(to bottom,
            transparent 0,
            transparent calc(var(--guide-spacing-lines) - var(--guide-thickness)),
            var(--guide-color) calc(var(--guide-spacing-lines) - var(--guide-thickness)),
            var(--guide-color) var(--guide-spacing-lines));
    background-size: 100% var(--guide-spacing-lines);
}

.bg-grid {
    background-image:
        repeating-linear-gradient(to right,
            transparent 0,
            transparent calc(var(--guide-spacing-grid) - var(--guide-thickness)),
            var(--guide-color) calc(var(--guide-spacing-grid) - var(--guide-thickness)),
            var(--guide-color) var(--guide-spacing-grid)),
        repeating-linear-gradient(to bottom,
            transparent 0,
            transparent calc(var(--guide-spacing-grid) - var(--guide-thickness)),
            var(--guide-color) calc(var(--guide-spacing-grid) - var(--guide-thickness)),
            var(--guide-color) var(--guide-spacing-grid));
    background-size: var(--guide-spacing-grid) var(--guide-spacing-grid);
}

#whiteboard {
    display: block;
    width: 100%;
    height: 100%;
    cursor: crosshair;
}

.text-input {
    position: absolute;
    min-width: 160px;
    min-height: 40px;
    padding: 8px 10px;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    font-family: 'Outfit', sans-serif;
    resize: both;
    background: rgba(255, 255, 255, 0.95);
    color: var(--text-color);
    z-index: 120;
    outline: none;
    user-select: text;
    -webkit-user-select: text;
}

.text-toolbar {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 8px;
    border-radius: 8px;
    background: var(--glass-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    z-index: 121;
}

.text-toolbar label {
    font-size: 12px;
    color: var(--text-color);
}

.text-toolbar input[type="color"] {
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 6px;
    padding: 0;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.text-toolbar input[type="range"] {
    width: 120px;
    accent-color: var(--primary-color);
}

.text-toolbar select {
    height: 32px;
    border-radius: 6px;
    border: 1px solid var(--glass-border);
    padding: 4px 8px;
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
    cursor: pointer;
}

.text-toolbar .text-check {
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 8px;
    background: var(--primary-color);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(98, 0, 234, 0.25);
    transition: transform 0.15s ease;
}

.text-toolbar .text-check:hover {
    transform: translateY(-1px);
}

.aid-toolbar {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border-radius: 10px;
    background: var(--glass-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    z-index: 122;
    max-width: min(620px, calc(100vw - 16px));
}

.aid-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-color);
    opacity: 0.9;
    white-space: nowrap;
}

.aid-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.aid-controls label {
    font-size: 12px;
    color: var(--text-color);
    opacity: 0.9;
}

.aid-controls input[type="range"] {
    width: 160px;
    accent-color: var(--primary-color);
}

.aid-controls input[type="number"] {
    width: 72px;
    height: 32px;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    padding: 4px 8px;
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-color);
}

.aid-controls input[type="text"] {
    width: 220px;
    height: 32px;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    padding: 4px 8px;
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-color);
}

.aid-btn {
    height: 32px;
    padding: 0 10px;
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.85);
    color: var(--text-color);
    cursor: pointer;
}

.aid-btn.active {
    background: #4f883d;
    color: #fff;
    border-color: rgba(255, 255, 255, 0.35);
}

.aid-value {
    font-size: 12px;
    color: var(--text-color);
    opacity: 0.85;
    min-width: 28px;
    text-align: right;
}

/* Glassmorphism Utilities */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: 16px;
}

.glass-btn {
    background: var(--glass-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-color);
    display: flex;
    align-items: center;
    justify-content: center;
}

.glass-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
    background: rgba(255, 255, 255, 0.9);
}

.glass-btn:active {
    transform: translateY(0);
}

/* Toolbar */
#toolbar {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    padding: 12px 20px;
    gap: 16px;
    z-index: 100;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tool-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.separator {
    width: 1px;
    height: 24px;
    background-color: rgba(0, 0, 0, 0.1);
}

.tool-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-color);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tool-btn .icon-img {
    width: 24px;
    height: 24px;
    object-fit: contain;
}

.tool-btn:hover {
    background: rgba(0, 0, 0, 0.05);
}

.tool-btn.active {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 12px rgba(98, 0, 234, 0.3);
}

.tool-btn.danger:hover {
    color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

/* Inputs */
#color-picker {
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 50%;
    padding: 0;
    overflow: hidden;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

#color-picker::-webkit-color-swatch-wrapper {
    padding: 0;
}

#color-picker::-webkit-color-swatch {
    border: none;
    border-radius: 50%;
}

#size-slider {
    width: 100px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

/* Fullscreen Button */
#fullscreen-btn {
    position: absolute;
    top: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    z-index: 100;
}

/* Responsive */
@media (max-width: 600px) {
    #toolbar {
        width: 90%;
        flex-wrap: wrap;
        justify-content: center;
        bottom: 16px;
        padding: 12px;
    }

    #size-slider {
        width: 80px;
    }
}

/* Dropdown Menus (shapes, background) */
.tool-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.shape-menu,
.bg-menu,
.aid-menu,
.pen-menu {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    padding: 8px;
    margin-bottom: 12px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 90;
    min-width: 40px;
}

.shape-menu.visible,
.bg-menu.visible,
.aid-menu.visible,
.pen-menu.visible {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.shape-option {
    width: 36px;
    height: 36px;
}

.aid-option {
    width: 36px;
    height: 36px;
}

.pen-tip {
    width: 36px;
    height: 36px;
}

.pen-color {
    width: 28px;
    height: 28px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.55);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
    padding: 0;
}

.pen-color:hover {
    transform: translateY(-1px);
}

.pen-color.active {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.shape-option:hover {
    background: rgba(98, 0, 234, 0.1);
    color: var(--primary-color);
}

.shape-option.active {
    background: var(--primary-color);
    color: white;
}

.aid-option:hover {
    background: rgba(98, 0, 234, 0.1);
    color: var(--primary-color);
}

.aid-option.active {
    background: var(--primary-color);
    color: white;
}

.bg-option:hover {
    background: rgba(98, 0, 234, 0.1);
    color: var(--primary-color);
}

.bg-option.active {
    background: var(--primary-color);
    color: white;
}

.bg-menu .menu-row {
    display: flex;
    gap: 8px;
    align-items: center;
}

.bg-menu .menu-row-wide {
    justify-content: space-between;
}

.menu-label {
    font-size: 12px;
    color: var(--text-color);
}

#bg-color {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 8px;
    padding: 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
    cursor: pointer;
}

#bg-color::-webkit-color-swatch-wrapper {
    padding: 0;
}

#bg-color::-webkit-color-swatch {
    border: none;
    border-radius: 8px;
}

#bg-thickness,
#bg-spacing {
    flex: 1;
    accent-color: var(--primary-color);
}

#bg-color:disabled,
#bg-thickness:disabled,
#bg-spacing:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Tooltips */
.tool-btn[data-tooltip],
.glass-btn[data-tooltip],
input[data-tooltip] {
    position: relative;
}

.tool-btn[data-tooltip]:hover::after,
.glass-btn[data-tooltip]:hover::after,
input[data-tooltip]:hover::after,
.tool-btn[data-tooltip]:focus-visible::after,
.glass-btn[data-tooltip]:focus-visible::after,
input[data-tooltip]:focus-visible::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
    background: rgba(17, 24, 39, 0.95);
    color: #fff;
    font-size: 12px;
    padding: 6px 8px;
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    pointer-events: none;
    z-index: 120;
}

.tool-btn[data-tooltip]:hover::before,
.glass-btn[data-tooltip]:hover::before,
input[data-tooltip]:hover::before,
.tool-btn[data-tooltip]:focus-visible::before,
.glass-btn[data-tooltip]:focus-visible::before,
input[data-tooltip]:focus-visible::before {
    content: '';
    position: absolute;
    bottom: calc(100% + 4px);
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: rgba(17, 24, 39, 0.95);
    pointer-events: none;
    z-index: 119;
}