/* expression.css */

/* expression.css */

/* --- Layout --- */
body {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
    margin: 0;
}

/* Level Badge */
#level-indicator {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 6px 16px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.9rem;
    text-transform: uppercase;
    background: var(--bg-card);
    color: var(--text-secondary);
    letter-spacing: 0.5px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
    z-index: 10;
}

.lvl-1 {
    background: rgba(16, 185, 129, 0.2) !important;
    color: #34d399 !important;
    border: 1px solid #10b981;
}

.lvl-2 {
    background: rgba(99, 102, 241, 0.2) !important;
    color: #818cf8 !important;
    border: 1px solid #6366f1;
}

.lvl-3 {
    background: rgba(245, 158, 11, 0.2) !important;
    color: #fbbf24 !important;
    border: 1px solid #f59e0b;
}

.lvl-4 {
    background: rgba(249, 115, 22, 0.2) !important;
    color: #fdba74 !important;
    border: 1px solid #f97316;
}

.lvl-5 {
    background: rgba(244, 63, 94, 0.2) !important;
    color: #fda4af !important;
    border: 1px solid #f43f5e;
}

/* Structural */
#app-wrapper {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    overflow: hidden;
    position: relative;
    background-color: var(--bg-main);
}

#circuit-view {
    flex-grow: 1;
    background-color: var(--bg-dark);
    background-image: radial-gradient(var(--border-color) 1px, transparent 1px);
    background-size: 20px 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    position: relative;
}

svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 0 10px rgba(99, 102, 241, 0.1));
}

.gate-body {
    fill: var(--bg-panel);
    stroke: var(--text-main);
    stroke-width: 2;
}

.gate-text {
    font-family: 'Segoe UI', sans-serif;
    font-size: 14px;
    font-weight: bold;
    fill: var(--text-main);
    text-anchor: middle;
    dominant-baseline: middle;
}

.wire {
    fill: none;
    stroke: var(--text-muted);
    stroke-width: 3;
    stroke-linecap: round;
    transition: stroke 0.3s;
}

.io-label {
    font-family: 'Fira Code', monospace;
    font-weight: bold;
    font-size: 18px;
    fill: var(--text-main);
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.1);
}

/* Control Panel */
#control-panel {
    background: var(--bg-panel);
    border-top: 1px solid var(--border-color);
    padding: 25px;
    box-shadow: 0 -4px 15px rgba(0, 0, 0, 0.2);
    z-index: 30;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    flex-shrink: 0;
    position: relative;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 15px;
    width: 100%;
    max-width: 900px;
    background: var(--bg-card);
    padding: 15px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

/* Text Input Area */
.q-equals {
    font-family: 'Fira Code', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-secondary);
}

#expr-input {
    flex-grow: 1;
    border: none;
    background: transparent;
    font-family: 'Fira Code', monospace;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-main);
    outline: none;
    text-transform: uppercase;
    letter-spacing: 1px;
}

#expr-input::placeholder {
    color: var(--text-muted);
    opacity: 0.5;
    font-size: 1.2rem;
}

/* Keypad */
.keypad {
    display: flex;
    gap: 8px;
}

.key-btn {
    padding: 10px 16px;
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-weight: 700;
    color: var(--text-main);
    cursor: pointer;
    transition: all 0.2s;
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
}

.key-btn:hover {
    background: var(--bg-hover);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

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

.key-op {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-light);
    border-color: var(--primary);
}

.key-op:hover {
    background: rgba(99, 102, 241, 0.2);
}

/* Actions */
.action-row {
    display: flex;
    gap: 15px;
    width: 100%;
    max-width: 900px;
}

.main-btn {
    flex: 1;
    padding: 14px;
    border-radius: 8px;
    border: none;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-check {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 10px rgba(99, 102, 241, 0.3);
}

.btn-check:hover {
    filter: brightness(1.1);
    transform: translateY(-2px);
}

.btn-check.btn-success {
    background: linear-gradient(135deg, #10b981, #059669) !important;
    transform: scale(1.02);
}

.btn-check.btn-error {
    background: linear-gradient(135deg, #ef4444, #dc2626) !important;
    animation: shake 0.4s;
}

.btn-skip {
    background: var(--bg-main);
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    flex: 0 0 140px;
}

.btn-skip:hover {
    background: var(--bg-hover);
    color: var(--text-main);
    border-color: var(--text-muted);
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-5px);
    }

    75% {
        transform: translateX(5px);
    }
}

/* Feedback Toast */
#feedback-toast {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: var(--bg-card);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.28);
    margin-bottom: 20px;
    text-align: center;
    width: max-content;
    max-width: 90%;
    z-index: 40;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-color);
}

#feedback-toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

#feedback-toast.success {
    background: rgba(16, 185, 129, 0.9);
    border-color: #34d399;
}

#feedback-toast.error {
    background: rgba(239, 68, 68, 0.9);
    border-color: #f87171;
}