:root {
    --bg-color: #0f172a;
    --panel-bg: rgba(30, 41, 59, 0.7);
    --border-color: rgba(255, 255, 255, 0.1);
    --accent-color: #3b82f6;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --danger-color: #ef4444;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
}

/* Toolbar */
#toolbar {
    height: 60px;
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    z-index: 100;
}

.logo {
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: -0.5px;
}

.actions {
    display: flex;
    gap: 16px;
    align-items: center;
    transition: opacity 0.3s ease;
}

#toolbar.disabled {
    pointer-events: none;
    opacity: 0.6;
}

.search-container {
    position: relative;
    display: flex;
    align-items: center;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 0 12px;
    transition: all 0.2s ease;
    width: 200px;
}

.search-container:focus-within {
    border-color: var(--accent-color);
    background: rgba(0, 0, 0, 0.3);
    width: 260px;
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.2);
}

.search-icon {
    color: var(--text-muted);
    margin-right: 8px;
    flex-shrink: 0;
}

#search-input {
    background: transparent;
    border: none;
    color: white;
    padding: 8px 0;
    font-size: 0.85rem;
    outline: none;
    width: 100%;
}

#search-input::placeholder {
    color: var(--text-muted);
}

button {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: white;
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

button:hover {
    background: rgba(255, 255, 255, 0.1);
}

button.danger:hover {
    background: var(--danger-color);
}

.divider {
    width: 1px;
    height: 24px;
    background: var(--border-color);
}

#save-status {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.8rem;
    opacity: 0.7;
}

#save-status.syncing {
    color: var(--accent-color);
    opacity: 1;
}

.controls-group {
    display: flex;
    gap: 12px;
    align-items: center;
}

.select-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.select-wrapper select {
    appearance: none;
    -webkit-appearance: none;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 8px 32px 8px 12px;
    border-radius: 8px;
    font-size: 0.85rem;
    cursor: pointer;
    outline: none;
    transition: all 0.2s ease;
    min-width: 140px;
}

.select-wrapper select:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.select-wrapper::after {
    content: '';
    position: absolute;
    right: 12px;
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 4px solid var(--text-muted);
    pointer-events: none;
}

/* Canvas & Network */
#canvas-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    background-color: var(--bg-color);
}

#network-container {
    width: 100%;
    height: 100%;
}

/* Inspector */
#inspector {
    position: absolute;
    top: 80px;
    right: 20px;
    width: 320px;
    background: var(--panel-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
    z-index: 200;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.2s;
}

#inspector.hidden {
    transform: translateX(360px);
    opacity: 0;
    pointer-events: none;
}

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

#close-inspector {
    background: transparent;
    border: none;
    font-size: 1.5rem;
}

.inspector-body {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.field label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

input[type="text"],
select {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    color: white;
    padding: 10px;
    border-radius: 6px;
    outline: none;
    font-size: 0.9rem;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 5px;
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.5);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.5);
}

/* Color Picker UI */
.color-picker {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    max-height: 200px;
    overflow-y: auto;
    padding-right: 5px;
}

.color-swatch-container {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.color-swatch {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    border: 2px solid transparent;
    flex-shrink: 0;
}

.color-swatch.active {
    border-color: white;
    box-shadow: 0 0 10px var(--accent-color);
}

.swatch-label {
    font-size: 0.85rem;
    color: var(--text-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.custom-color-row {
    display: flex;
    gap: 8px;
    margin-top: 15px;
}

#hex-input {
    width: 40px;
    height: 40px;
    border: none;
    background: none;
    cursor: pointer;
}

#custom-label {
    flex: 1;
    height: 40px;
}

#add-preset-btn {
    width: 40px;
    height: 40px;
    padding: 0;
    justify-content: center;
}

/* Quiz Styles */
#quiz-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

#quiz-overlay.hidden {
    display: none;
}

#quiz-modal {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    padding: 30px;
    display: flex;
    flex-direction: column;
}

#quiz-questions {
    flex: 1;
}

.quiz-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 15px;
}

.quiz-question {
    margin-bottom: 25px;
}

.quiz-option {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    text-align: center;
    word-break: break-word;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
}

.quiz-option.selected {
    border-color: var(--accent-color);
    background: rgba(59, 130, 246, 0.2);
}

#interaction-hint {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.5);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

@media (max-width: 600px) {
    #toolbar {
        padding: 0 12px;
        gap: 12px;
    }

    .logo {
        font-size: 0.9rem;
        white-space: nowrap;
        display: none;
        /* Hide logo on small screens to prioritize tools */
    }

    .actions {
        flex: 1;
        overflow-x: auto;
        overflow-y: hidden;
        display: flex;
        align-items: center;
        gap: 10px;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        /* Firefox */
        padding: 5px 0;
    }

    .actions::-webkit-scrollbar {
        display: none;
        /* Chrome, Safari, Edge */
    }

    .search-container {
        width: 140px;
        flex-shrink: 0;
    }

    .search-container:focus-within {
        width: 180px;
    }

    button {
        flex-shrink: 0;
        padding: 8px 12px;
    }

    .divider {
        flex-shrink: 0;
    }

    #inspector {
        top: auto;
        bottom: 0;
        right: 0;
        left: 0;
        width: 100%;
        border-radius: 20px 20px 0 0;
        transform: translateY(0);
        max-height: 80vh;
        overflow-y: auto;
    }

    #inspector.hidden {
        transform: translateY(100%);
    }

    .color-picker {
        grid-template-columns: 1fr 1fr;
    }
}