/* === Search & Filter === */
#search-bar {
    position: absolute;
    top: 68px;
    left: 20px;
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

#search-input {
    width: 220px;
    padding: 10px 14px 10px 36px;
    border: 1px solid var(--card-border);
    background: var(--btn-bg);
    color: var(--text);
    font-size: 13px;
    border-radius: 20px;
    outline: none;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

#search-input::placeholder {
    color: var(--accent-dim);
}

#search-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 15px var(--accent-dim);
    width: 260px;
}

#search-bar .search-icon {
    position: absolute;
    top: 11px;
    left: 12px;
    font-size: 14px;
    color: var(--accent-dim);
    pointer-events: none;
}

#filter-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    max-width: 280px;
}

.chip {
    padding: 4px 10px;
    border: 1px solid var(--card-border);
    background: var(--btn-bg);
    color: var(--accent);
    font-size: 10px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.chip:hover,
.chip.active {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
}

/* === Slider Controls Common === */
.slider-control label {
    font-size: 11px;
    color: var(--accent-dim);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* === Temperature Slider === */
#temp-control {
    position: absolute;
    top: 108px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

#temp-control.visible {
    display: flex;
}

#temp-slider {
    width: 300px;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: linear-gradient(to right, #3366ff, #33ccff, #33ff66, #ffcc33, #ff3333);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

#temp-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg);
    box-shadow: 0 0 10px var(--accent-dim);
    cursor: pointer;
}

#temp-value {
    font-size: 12px;
    color: var(--accent);
    font-weight: 500;
}

#temp-toggle {
    position: absolute;
    top: 68px;
    right: 70px;
    z-index: 100;
    width: 42px;
    height: 42px;
    border: 1px solid var(--card-border);
    background: var(--btn-bg);
    color: var(--accent);
    font-size: 16px;
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

#temp-toggle:hover {
    border-color: var(--accent);
    box-shadow: 0 0 15px var(--accent-dim);
}

#temp-toggle.active {
    background: var(--accent);
    color: var(--bg);
}

/* === Timeline === */
#timeline-control {
    position: absolute;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    width: 500px;
}

#timeline-control.visible {
    display: flex;
}

#timeline-slider {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: linear-gradient(to right, var(--card-border), var(--accent));
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

#timeline-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg);
    box-shadow: 0 0 8px var(--accent-dim);
    cursor: pointer;
}

#timeline-info {
    display: flex;
    justify-content: space-between;
    width: 100%;
    font-size: 11px;
    color: var(--accent-dim);
}

#timeline-year {
    font-size: 14px;
    color: var(--accent);
    font-weight: 600;
}

#timeline-toggle {
    position: absolute;
    top: 68px;
    right: 120px;
    z-index: 100;
    width: 42px;
    height: 42px;
    border: 1px solid var(--card-border);
    background: var(--btn-bg);
    color: var(--accent);
    font-size: 14px;
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

#timeline-toggle:hover {
    border-color: var(--accent);
    box-shadow: 0 0 15px var(--accent-dim);
}

#timeline-toggle.active {
    background: var(--accent);
    color: var(--bg);
}

/* === Quiz Mode === */
#quiz-panel {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 200;
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    padding: 30px 40px;
    background: var(--panel-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    backdrop-filter: blur(20px);
    box-shadow: 0 0 60px var(--shadow);
    min-width: 320px;
}

#quiz-panel.visible {
    display: flex;
}

#quiz-question {
    font-size: 18px;
    color: var(--text);
    text-align: center;
    font-weight: 300;
}

#quiz-score {
    font-size: 13px;
    color: var(--accent);
}

#quiz-timer {
    font-size: 24px;
    color: var(--accent);
    font-weight: 700;
}

#quiz-feedback {
    font-size: 14px;
    font-weight: 500;
    min-height: 20px;
}

#quiz-feedback.correct {
    color: #33ff88;
}

#quiz-feedback.wrong {
    color: #ff4466;
}

.quiz-btn {
    padding: 8px 20px;
    border: 1px solid var(--card-border);
    background: var(--btn-bg);
    color: var(--accent);
    font-size: 13px;
    cursor: pointer;
    border-radius: 20px;
    transition: all 0.3s;
}

.quiz-btn:hover {
    background: var(--accent);
    color: var(--bg);
}

#quiz-start-btn {
    position: absolute;
    top: 68px;
    right: 170px;
    z-index: 100;
    width: 42px;
    height: 42px;
    border: 1px solid var(--card-border);
    background: var(--btn-bg);
    color: var(--accent);
    font-size: 16px;
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

#quiz-start-btn:hover {
    border-color: var(--accent);
    box-shadow: 0 0 15px var(--accent-dim);
}

#quiz-skip {
    padding: 8px 20px;
    border: 1px solid var(--card-border);
    background: var(--btn-bg);
    color: var(--accent);
    font-size: 13px;
    cursor: pointer;
    border-radius: 20px;
    transition: all 0.3s;
}

#quiz-skip:hover {
    background: var(--accent);
    color: var(--bg);
}

/* === Element State Colors (Temperature) === */
.element.state-solid {
    border-color: #4488ff !important;
    box-shadow: 0 0 10px rgba(68, 136, 255, 0.3) !important;
}

.element.state-liquid {
    border-color: #44ff88 !important;
    box-shadow: 0 0 10px rgba(68, 255, 136, 0.3) !important;
}

.element.state-gas {
    border-color: #ff4466 !important;
    box-shadow: 0 0 10px rgba(255, 68, 102, 0.3) !important;
}

.element.state-unknown {
    border-color: #666 !important;
    opacity: 0.5;
}

/* === Element Dimmed (filtered out) === */
.element.dimmed {
    opacity: 0.15 !important;
    pointer-events: none;
}

.element.highlighted {
    border-color: var(--accent) !important;
    box-shadow: 0 0 25px var(--accent-dim) !important;
    transform: scale(1.05);
}

/* === Element Ghost (timeline undiscovered) === */
.element.ghost {
    opacity: 0.1 !important;
    pointer-events: none;
}

.element.just-discovered {
    animation: discoveryFlash 1.5s ease;
}

@keyframes discoveryFlash {
    0% {
        box-shadow: 0 0 0 rgba(127, 255, 255, 0);
    }

    50% {
        box-shadow: 0 0 40px rgba(127, 255, 255, 0.8);
    }

    100% {
        box-shadow: 0 0 0 rgba(127, 255, 255, 0);
    }
}

/* === Keyboard Focus === */
.element.kbd-focus {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

/* === Notification Toast === */
#toast {
    position: absolute;
    bottom: 120px;
    left: 50%;
    transform: translateX(-50%);
    padding: 10px 20px;
    background: var(--btn-bg);
    border: 1px solid var(--card-border);
    color: var(--accent);
    font-size: 12px;
    border-radius: 20px;
    z-index: 300;
    backdrop-filter: blur(10px);
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

#toast.visible {
    opacity: 1;
}

/* === Sound Toggle === */
#sound-toggle {
    position: absolute;
    bottom: 30px;
    right: 20px;
    z-index: 100;
    width: 36px;
    height: 36px;
    border: 1px solid var(--card-border);
    background: var(--btn-bg);
    color: var(--accent);
    font-size: 14px;
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

#sound-toggle:hover {
    border-color: var(--accent);
    box-shadow: 0 0 10px var(--accent-dim);
}

#sound-toggle.muted {
    opacity: 0.4;
}