:root {
    --bg-canvas: #eef2f5;
    --bg-panel: #ffffff;
    --text-main: #333333;
    --text-title: #2c3e50;
    --border-color: #dcdde1;
    --btn-bg: #f5f6fa;
    --btn-hover: #e1e2e6;
    --info-bg: #f8f9fa;
    --tooltip-bg: #2c3e50;
    --tooltip-text: #ecf0f1;
}

body.dark-mode {
    --bg-canvas: #121212;
    --bg-panel: #1e1e1e;
    --text-main: #e0e0e0;
    --text-title: #ecf0f1;
    --border-color: #333333;
    --btn-bg: #2d2d2d;
    --btn-hover: #3d3d3d;
    --info-bg: #222222;
    --tooltip-bg: #ecf0f1;
    --tooltip-text: #2c3e50;
}

body {
    margin: 0; padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex; 
    height: 100dvh; /* FIX: dvh (dynamic viewport height) verhindert, dass mobile UI-Leisten die Leiste verdecken */
    background-color: var(--bg-canvas);
    color: var(--text-main);
    overflow: hidden;
    transition: background-color 0.3s, color 0.3s;
}

#modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.6); display: none; justify-content: center; align-items: center; z-index: 10000;
}

.modal {
    background: var(--bg-panel); padding: 20px; border-radius: 8px;
    display: flex; flex-direction: column; gap: 15px; min-width: 280px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3); border: 1px solid var(--border-color);
}

#modal-title { margin: 0; font-size: 14px; color: var(--text-title); line-height: 1.4; }

.modal input {
    padding: 8px; font-size: 16px; border: 1px solid var(--border-color);
    border-radius: 4px; outline: none; background: var(--bg-canvas); color: var(--text-main);
}
.modal input:focus { border-color: #3498db; }

.modal-buttons { display: flex; gap: 10px; justify-content: flex-end; }
.modal-buttons button { padding: 8px 12px; font-size: 13px; color: var(--text-main); background: var(--btn-bg); border: 1px solid var(--border-color); border-radius: 4px; cursor:pointer; }
.modal-buttons button:hover { background: var(--btn-hover); }

#toolbar {
    width: 300px; background-color: var(--bg-panel); box-shadow: 2px 0 10px rgba(0,0,0,0.2);
    padding: 10px 12px; display: flex; flex-direction: column; gap: 6px; z-index: 10; overflow-y: auto;
    transition: background-color 0.3s;
    min-width: 320px;      /* Setzt eine absolute Mindestbreite */
    flex-shrink: 0;        /* Verhindert strikt, dass der Browser das Element staucht */
}

.main-title { margin: 0; font-size: 16px; color: var(--text-title); text-align: center; font-weight: 800; letter-spacing: 0.5px; }

h2 {
    margin: 0 0 2px 0; font-size: 11px; color: var(--text-title);
    border-bottom: 2px solid #3498db; padding-bottom: 2px; text-transform: uppercase; letter-spacing: 0.5px;
}

.tool-section { display: flex; flex-direction: column; gap: 4px; }
.btn-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 5px; }
.btn-grid-atom { grid-template-columns: repeat(5, 1fr); }
.btn-grid-six { grid-template-columns: repeat(6, 1fr); }
.btn-grid-third { grid-template-columns: repeat(3, 1fr); }
.btn-grid-color { grid-template-columns: repeat(6, 1fr); }

button {
    padding: 8px 4px; border: 1px solid var(--border-color); background-color: var(--btn-bg);
    border-radius: 6px; cursor: pointer; font-size: 12px; font-weight: bold; color: var(--text-main);
    transition: all 0.15s ease-out; display: flex; align-items: center; justify-content: center; gap: 2px;
}

button svg {
    pointer-events: none;
    display: block;
}

button:active { transform: scale(0.96); }
button:hover { background-color: var(--btn-hover); }

button.active {
    background-color: #3498db; color: white; border-color: #2980b9;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.15);
}

.btn-color { height: 18px; padding: 0; border: 2px solid transparent; border-radius: 4px; }
.btn-color.active { border: 2px solid var(--text-main); transform: scale(1.1); box-shadow: 0 0 5px rgba(0,0,0,0.3); }
#color-wheel-btn:hover { transform: scale(1.08); box-shadow: 0 0 6px rgba(0,0,0,0.3); }
#clear-custom-colors-btn:hover { opacity: 1 !important; transform: scale(1.1); }

.btn-charge.active { background-color: #9b59b6; border-color: #8e44ad; }

#clear-btn { background-color: #34495e; color: white; border-color: #2c3e50; padding: 6px; font-size: 10px; margin-top: auto; }
#clear-btn:hover { background-color: #2c3e50; }

#export-btn, #svg-export-btn, #mol-export-btn, #mol-import-btn, #smiles-btn { padding: 6px; font-size: 10px; border: 1px solid rgba(0,0,0,0.1); }

.blue-btn { transition: background-color 0.15s ease-out, transform 0.15s ease-out; }
.blue-btn.light-blue { background-color: #3498dbc0; color: white; }
.blue-btn.light-blue:hover { background-color: #3498db; }
.blue-btn.mid-blue { background-color: #3498dbe0; color: white; }
.blue-btn.mid-blue:hover { background-color: #2980b9; }
.blue-btn.solid-blue { background-color: #3498db; color: white; }
.blue-btn.solid-blue:hover { background-color: #2980b9; }
#reset-view-btn { background-color: var(--btn-hover); color: var(--text-title); padding: 6px; }

.checkbox-container {
    display: flex; align-items: center; gap: 6px; font-size: 10px; cursor: pointer;
    background: var(--info-bg); padding: 4px; border-radius: 4px; border: 1px solid var(--border-color); color: var(--text-main);
}
.checkbox-container input { cursor: pointer; width: 14px; height: 14px; margin: 0; }

.info-text {
    font-size: 10px; color: var(--text-muted); line-height: 1.4; background: var(--info-bg);
    padding: 6px; border-radius: 4px; border-left: 3px solid #3498db;
}

.toolbar-footer { margin-top: 2px; text-align: center; }
.footer-line { border-top: 2px solid #3498db; margin-bottom: 4px; }
.placeholder-text { font-size: 9px; color: var(--text-muted); text-align: right; }

#canvas-container {
    flex-grow: 1; padding: 15px; display: flex; justify-content: center; align-items: center; position: relative; 
}

canvas {
    border-radius: 4px; cursor: crosshair; touch-action: none;
}

#modifiers-wrapper {
    position: absolute; 
    bottom: max(25px, env(safe-area-inset-bottom));
    left: 25px; 
    display: flex; gap: 15px;
    z-index: 100;
}

#virtual-modifiers, #chair-modifier {
    display: flex; gap: 8px;
    background: var(--bg-panel); padding: 8px; border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2); opacity: 0.9;
}

.mod-btn {
    padding: 10px 16px; font-size: 14px; font-weight: bold; border: 1px solid var(--border-color);
    background-color: var(--btn-bg); border-radius: 8px; cursor: pointer; color: var(--text-title);
    transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1); display: flex; align-items: center; justify-content: center; gap: 6px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.mod-btn:active { transform: scale(0.94); }
.mod-btn.active {
    background-color: #3498db; color: white; border-color: #2980b9;
    box-shadow: inset 0 3px 6px rgba(0,0,0,0.3); transform: translateY(1px);
}

#custom-tooltip {
    position: fixed; background-color: var(--tooltip-bg); color: var(--tooltip-text);
    padding: 6px 10px; border-radius: 6px; font-size: 11px; pointer-events: none; z-index: 9999;
    opacity: 0; transition: opacity 0.15s ease-in-out; white-space: pre-line; box-shadow: 0 4px 10px rgba(0,0,0,0.2); line-height: 1.4;
}

details.advanced-settings { background: var(--info-bg); border: 1px solid var(--border-color); border-radius: 6px; overflow: hidden; }
details.advanced-settings summary {
    padding: 8px 10px; font-size: 11px; font-weight: bold; cursor: pointer; outline: none; user-select: none;
    background: var(--btn-bg); color: var(--text-title); transition: background-color 0.15s;
}
.advanced-settings-content { padding: 8px; display: flex; flex-direction: column; gap: 6px; border-top: 1px solid var(--border-color); background: var(--bg-panel); }

/* ─── Toast Benachrichtigungs-System ────────────────────────────────────────── */
#toast-container {
    position: fixed;
    bottom: 25px;
    right: 25px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
    max-width: 380px;
}

.toast-item {
    pointer-events: auto;
    background: var(--bg-panel);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-left: 5px solid #3498db;
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
    padding: 12px 16px;
    font-size: 13px;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    transform: translateX(120%);
    opacity: 0;
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.35s ease;
    line-height: 1.4;
}

.toast-item.show {
    transform: translateX(0);
    opacity: 1;
}

.toast-item.hide {
    transform: translateX(120%);
    opacity: 0;
}

.toast-success { border-left-color: #2ecc71; }
.toast-error { border-left-color: #e74c3c; }
.toast-warning { border-left-color: #f1c40f; }
.toast-info { border-left-color: #3498db; }

.toast-content {
    display: flex;
    align-items: center;
    gap: 10px;
}

.toast-icon {
    font-size: 16px;
    flex-shrink: 0;
}

.toast-close {
    cursor: pointer;
    opacity: 0.5;
    font-size: 14px;
    border: none;
    background: transparent;
    color: var(--text-color);
    padding: 2px 4px;
    transition: opacity 0.2s;
    line-height: 1;
}

.toast-close:hover {
    opacity: 1;
}

/* ─── Cross-Platform Color Studio Modal ──────────────────────────────────────── */

#color-modal-overlay {
    position: fixed; top: 0; left: 0; width: 324px; height: 100%;
    background: rgba(0, 0, 0, 0.65); display: none; justify-content: center; align-items: center; z-index: 10000;
}

#color-modal-overlay .modal {
    width: 290px; max-width: 92%; padding: 16px; border-radius: 12px; gap: 14px; box-sizing: border-box;
}

#cp-hue, #cp-sat, #cp-light {
    width: 100%; height: 20px; border-radius: 6px; -webkit-appearance: none; appearance: none; outline: none; cursor: pointer;
    border: 1px solid var(--border-color);
    box-shadow: none;
    background-color: var(--bg-canvas);
    box-sizing: border-box;
}

#cp-hue {
    background: linear-gradient(to right, #ff0000 0%, #ffff00 17%, #00ff00 33%, #00ffff 50%, #0000ff 67%, #ff00ff 83%, #ff0000 100%);
}

#cp-hue::-webkit-slider-thumb, #cp-sat::-webkit-slider-thumb, #cp-light::-webkit-slider-thumb {
    -webkit-appearance: none; appearance: none; width: 22px; height: 22px; border-radius: 50%;
    background: #ffffff; border: 2px solid #333333; box-shadow: 0 2px 5px rgba(0,0,0,0.3); cursor: pointer;
}

#cp-hue::-moz-range-thumb, #cp-sat::-moz-range-thumb, #cp-light::-moz-range-thumb {
    width: 22px; height: 22px; border-radius: 50%;
    background: #ffffff; border: 2px solid #333333; box-shadow: 0 2px 5px rgba(0,0,0,0.3); cursor: pointer;
}

/* PSE Dropdown Styles */
.pse-grid {
    display: grid;
    grid-template-columns: repeat(18, 1fr);
    gap: calc(1px * var(--pse-scale, 1));
    width: calc(100% * var(--pse-scale, 1));
}

.pse-grid-btn {
    padding: calc(2px * var(--pse-scale, 1)) 0;
    font-size: calc(8px * var(--pse-scale, 1));
    font-weight: 600;
    border: 1px solid var(--border-color);
    border-radius: 3px;
    background: var(--bg-card);
    color: var(--text-main);
    cursor: pointer;
    text-align: center;
    transition: all 0.15s ease;
}

.pse-grid-btn:hover {
    background: #e9ecef;
    border-color: #3498db;
    color: #3498db;
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

[data-theme="dark"] .pse-grid-btn:hover {
    background: #2c3e50;
}