.numeric-keypad {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    display: none;
}

.numeric-keypad.show {
    display: block;
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ✅ ปรับลดขนาด container */
.keypad-container {
    background: #2d2d2d;
    border-radius: 10px;
    padding: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    min-width: 240px;
    max-width: 260px;
}

.keypad-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    padding-bottom: 6px;
    border-bottom: 1px solid #444;
}

.keypad-title {
    color: #fff;
    font-size: 13px;
    font-weight: 500;
}

.keypad-close {
    background: none;
    border: none;
    color: #fff;
    cursor: pointer;
    font-size: 16px;
    padding: 2px 6px;
}

.keypad-display {
    display: flex;
    gap: 6px;
    margin-bottom: 10px;
}

.keypad-display-input {
    flex: 1;
    background: #1a1a1a;
    border: 1px solid #555;
    color: #fff;
    padding: 8px 10px;
    border-radius: 6px;
    font-size: 16px;
    text-align: right;
}

.keypad-clear {
    background: #dc3545;
    border: none;
    color: #fff;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
}

.keypad-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    margin-bottom: 10px;
}

.keypad-row {
    display: contents;
}

/* ✅ ปรับลดขนาดปุ่ม */
.keypad-btn {
    background: #444;
    border: none;
    color: #fff;
    padding: 12px;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.2s;
    min-height: 44px;
}

.keypad-btn:hover {
    background: #555;
}

.keypad-btn:active {
    background: #666;
}

.keypad-decimal {
    background: #007bff;
}

.keypad-delete {
    background: #ffc107;
    color: #000;
}

.keypad-actions {
    display: flex;
    gap: 6px;
}

.keypad-actions button {
    flex: 1;
    padding: 8px 12px;
    font-size: 13px;
}
/* === Scientific Calculator Layout === */
.keypad-buttons {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 8px;
}

.keypad-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 4px;
}

/* แถววิทยาศาสตร์ - 5 คอลัมน์ */
.keypad-scientific-row {
    grid-template-columns: repeat(5, 1fr);
}

.keypad-btn {
    padding: 12px 8px;
    font-size: 1.05rem;
    font-weight: 600;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    cursor: pointer;
    transition: all 0.15s ease;
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.keypad-btn:hover {
    background: rgba(255, 255, 255, 0.18);
    transform: scale(1.03);
}

.keypad-btn:active {
    transform: scale(0.95);
    background: rgba(255, 255, 255, 0.25);
}

/* ปุ่มฟังก์ชัน (C, <, %) */
.keypad-function {
    background: rgba(255, 193, 7, 0.2);
    color: #ffc107;
}

.keypad-function:hover {
    background: rgba(255, 193, 7, 0.35);
}

/* ปุ่มตัวดำเนินการ (+, −, ×, ÷) */
.keypad-operator {
    background: rgba(96, 165, 250, 0.25);
    color: #60a5fa;
}

.keypad-operator:hover {
    background: rgba(96, 165, 250, 0.4);
}

/* ปุ่ม = */
.keypad-equals {
    background: linear-gradient(135deg, #10b981, #059669);
    color: #fff;
    font-size: 1.3rem;
    font-weight: 700;
}

.keypad-equals:hover {
    background: linear-gradient(135deg, #34d399, #10b981);
}

/* ปุ่มจุดทศนิยม */
.keypad-decimal {
    font-size: 1.5rem;
    font-weight: 700;
}

/* ปุ่ม fx toggle */
.keypad-fx-toggle {
    background: rgba(168, 85, 247, 0.2);
    color: #c084fc;
    font-weight: 700;
    font-size: 0.95rem;
}

.keypad-fx-toggle:hover {
    background: rgba(168, 85, 247, 0.35);
}

.keypad-fx-toggle.active {
    background: rgba(168, 85, 247, 0.5);
    color: #fff;
    box-shadow: 0 0 8px rgba(168, 85, 247, 0.4);
}

.keypad-fx-toggle i {
    margin-right: 3px;
}

/* แผงวิทยาศาสตร์ */
.scientific-panel {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(168, 85, 247, 0.05);
    animation: slideDown 0.25s ease-out;
}

.scientific-panel.show {
    display: flex;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

.keypad-scientific {
    background: rgba(168, 85, 247, 0.15);
    color: #c084fc;
    font-size: 0.82rem;
    padding: 8px 4px;
    min-height: 38px;
}

.keypad-scientific:hover {
    background: rgba(168, 85, 247, 0.3);
}

/* หน้าจอแสดงผล */
.keypad-display {
    padding: 14px 16px;
    background: rgba(0, 0, 0, 0.35);
    border-radius: 8px;
    margin: 8px;
}

.keypad-display-input {
    width: 100%;
    background: transparent;
    border: none;
    color: #fff;
    font-size: 1.6rem;
    font-weight: 600;
    text-align: right;
    font-family: 'Courier New', monospace;
    letter-spacing: 1px;
}

/* Container */
.keypad-container {
    width: 340px;
    max-width: 95vw;
    background: rgba(30, 30, 50, 0.98);
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Header */
.keypad-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px 16px 0 0;
    cursor: move;
}

.keypad-title {
    font-size: 0.88rem;
    color: #a29bfe;
    font-weight: 600;
}

.keypad-close {
    background: rgba(239, 68, 68, 0.2);
    border: none;
    color: #ef4444;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.keypad-close:hover {
    background: rgba(239, 68, 68, 0.4);
}

/* Actions */
.keypad-actions {
    display: flex;
    gap: 8px;
    padding: 10px 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.keypad-actions .btn {
    flex: 1;
}