/* CalcSolver - Button Styles */

.btn {
    height: 60px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.25rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    position: relative;
    overflow: hidden;
}

/* Ripple Effect */
.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.3s, height 0.3s, opacity 0.3s;
    opacity: 0;
}

.btn:active::after {
    width: 200%;
    height: 200%;
    opacity: 1;
    transition: 0s;
}

/* Number Buttons */
.btn-number {
    background-color: var(--btn-number-bg);
    color: var(--text-primary);
    box-shadow: 0 2px 4px var(--shadow-color);
}

.btn-number:hover {
    background-color: var(--btn-number-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn-number:active {
    transform: translateY(0) scale(0.95);
    box-shadow: 0 1px 2px var(--shadow-color);
}

.btn-number.btn-wide {
    grid-column: span 2;
}

/* Operator Buttons */
.btn-operator {
    background-color: var(--btn-operator-bg);
    color: white;
    box-shadow: 0 2px 8px rgba(255, 149, 0, 0.3);
}

.btn-operator:hover {
    background-color: var(--btn-operator-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 149, 0, 0.4);
}

.btn-operator:active {
    transform: translateY(0) scale(0.95);
}

/* Function Buttons */
.btn-function {
    background-color: var(--btn-function-bg);
    color: white;
    box-shadow: 0 2px 4px var(--shadow-color);
}

.btn-function:hover {
    background-color: var(--btn-function-hover);
    transform: translateY(-1px);
}

.btn-function:active {
    transform: translateY(0) scale(0.95);
}

/* Equals Button */
.btn-equals {
    background-color: var(--btn-equals-bg);
    color: white;
    box-shadow: 0 2px 8px rgba(76, 217, 100, 0.3);
}

.btn-equals:hover {
    background-color: var(--btn-equals-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(76, 217, 100, 0.4);
}

.btn-equals:active {
    transform: translateY(0) scale(0.95);
}

/* Clear Button */
.btn-clear {
    background-color: var(--btn-clear-bg);
    color: white;
    box-shadow: 0 2px 8px rgba(255, 59, 48, 0.3);
}

.btn-clear:hover {
    background-color: var(--btn-clear-hover);
    transform: translateY(-1px);
}

.btn-clear:active {
    transform: translateY(0) scale(0.95);
}

/* Constant Buttons */
.btn-constant {
    background-color: var(--btn-constant-bg);
    color: white;
    box-shadow: 0 2px 8px rgba(90, 200, 250, 0.3);
}

.btn-constant:hover {
    background-color: var(--btn-constant-hover);
    transform: translateY(-1px);
}

.btn-constant:active {
    transform: translateY(0) scale(0.95);
}

/* Scientific Button Adjustments */
.scientific-grid .btn {
    height: 50px;
    font-size: 1rem;
}

.scientific-grid .btn-number,
.scientific-grid .btn-equals {
    font-size: 1.25rem;
}

/* Button Focus States */
.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.5);
}

.btn:focus-visible {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

/* Button Disabled State */
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Long Press Animation */
.btn.long-press {
    animation: longPress 0.3s ease-out;
}

@keyframes longPress {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(0.9);
    }
    100% {
        transform: scale(1);
    }
}

/* Button Variants for Special Functions */
.btn-scientific {
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: -0.5px;
}

/* Icon Buttons in Scientific Mode */
.btn sup {
    font-size: 0.7em;
    vertical-align: super;
}

.btn sub {
    font-size: 0.7em;
    vertical-align: sub;
}