/* TI-84 Calculator - Exact Match */

.ti84-calc-container {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    width: 100%;
}

.ti84-calc {
    background: linear-gradient(180deg, #1a1a2e 0%, #16213e 100%);
    border: 8px solid #4a69bd;
    border-radius: 25px;
    padding: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
    width: 100%;
    max-width: 420px;
    position: relative;
}

.calc-brand {
    background: #000;
    color: #fff;
    padding: 8px;
    text-align: center;
    border-radius: 10px;
    margin-bottom: 15px;
    font-size: 13px;
    font-weight: bold;
}

/* Screen */
.calc-screen {
    background: #fff;
    border: 4px solid #2c3e50;
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 15px;
    min-height: 200px;
    font-family: 'Courier New', monospace;
}

.screen-header {
    font-size: 8px;
    color: #333;
    font-weight: bold;
    margin-bottom: 8px;
    letter-spacing: 1px;
    text-align: right;
    padding-right: 15px;
}

.screen-header::after {
    content: '🔋';
    float: right;
    margin-left: 10px;
}

.screen-display {
    min-height: 100px;
    font-size: 18px;
    color: #000;
    padding: 5px;
    line-height: 1.5;
    word-wrap: break-word;
}

.screen-input {
    font-size: 20px;
    font-weight: bold;
    color: #000;
    padding: 5px;
    min-height: 30px;
    border-top: 1px solid #ddd;
    margin-top: 5px;
    position: relative;
}

.screen-input .cursor {
    display: inline-block;
    width: 2px;
    height: 18px;
    background: #000;
    animation: blink 1s infinite;
    vertical-align: text-bottom;
    margin-left: 1px;
}

@keyframes blink {
    0%, 49% { opacity: 1; }
    50%, 100% { opacity: 0; }
}

#calc-graph {
    width: 100%;
    display: none;
}

/* Keypad */
.calc-keypad {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.key-row {
    display: flex;
    gap: 4px;
}

.key {
    flex: 1;
    min-height: 50px;
    padding: 4px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    font-weight: bold;
    position: relative;
    box-shadow: 0 3px 0 rgba(0, 0, 0, 0.4);
    transition: all 0.1s;
    text-align: center;
    line-height: 1.2;
}

.key:active, .key.active {
    transform: translateY(2px);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.4);
}

/* Key labels */
.key-second {
    font-size: 7px;
    color: #ffd700;
    display: block;
    margin-bottom: 1px;
}

.key-alpha {
    font-size: 7px;
    display: block;
    margin-bottom: 1px;
}

.key-alpha.green {
    color: #2ecc71;
}

.key-main {
    font-size: 11px;
    display: block;
    margin-top: auto;
}

/* Key colors - Exact match to image */
.key-gray {
    background: linear-gradient(145deg, #b8b8b8, #909090);
    color: #000;
}

.key-blue {
    background: linear-gradient(145deg, #3498db, #2980b9);
    color: #fff;
}

.key-green {
    background: linear-gradient(145deg, #27ae60, #229954);
    color: #fff;
}

.key-green .key-second {
    color: #ffd700;
}

.key-black {
    background: linear-gradient(145deg, #34495e, #2c3e50);
    color: #fff;
}

.key-black .key-second {
    color: #ffd700;
}

.key-black .key-alpha {
    color: #2ecc71;
}

.key-white {
    background: linear-gradient(145deg, #ffffff, #e8e8e8);
    color: #000;
}

.key-white .key-second {
    color: #ff9800;
}

.key-white .key-alpha {
    color: #2ecc71;
}

.key-arrow {
    background: linear-gradient(145deg, #7f8c8d, #5d6d7e);
    color: #fff;
    font-size: 18px;
    min-width: 45px;
}

.key-enter {
    background: linear-gradient(145deg, #4a90e2, #3a7bc8);
}

/* Hover effects */
.key-gray:hover { background: linear-gradient(145deg, #c8c8c8, #a0a0a0); }
.key-blue:hover { background: linear-gradient(145deg, #5dade2, #3498db); }
.key-green:hover { background: linear-gradient(145deg, #52be80, #27ae60); }
.key-black:hover { background: linear-gradient(145deg, #415b76, #34495e); }
.key-white:hover { background: linear-gradient(145deg, #f8f8f8, #e0e0e0); }
.key-arrow:hover { background: linear-gradient(145deg, #95a5a6, #7f8c8d); }

/* Responsive */
@media (max-width: 480px) {
    .ti84-calc-container {
        padding: 10px;
    }
    
    .ti84-calc {
        max-width: 100%;
        padding: 15px;
        border-width: 5px;
    }
    
    .calc-screen {
        min-height: 200px;
    }
    
    .key {
        min-height: 45px;
        font-size: 9px;
        padding: 3px;
    }
    
    .key-main {
        font-size: 10px;
    }
    
    .key-second, .key-alpha {
        font-size: 6px;
    }
}

@media (min-width: 481px) and (max-width: 768px) {
    .ti84-calc {
        max-width: 450px;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .ti84-calc {
        max-width: 500px;
    }
    
    .key {
        min-height: 55px;
    }
}

@media (min-width: 1025px) {
    .ti84-calc {
        max-width: 550px;
    }
    
    .key {
        min-height: 58px;
        font-size: 11px;
    }
    
    .key-main {
        font-size: 12px;
    }
    
    .calc-screen {
        min-height: 260px;
    }
}