/* =========================================
   SCIENTIFIC CALCULATOR CSS
   ========================================= */

:root {
    --sci-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --sci-gradient-2: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --sci-gradient-3: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    --sci-gradient-danger: linear-gradient(135deg, #eb3349 0%, #f45c43 100%);
    --sci-bg-dark: #0f172a;
    --sci-bg-card: #1e293b;
    --sci-bg-input: #0f172a;
    --sci-bg-display: #000000;
    --sci-border: #334155;
    --sci-border-light: #475569;
    --sci-white: #ffffff;
    --sci-gray: #cbd5e1;
    --sci-muted: #94a3b8;
    --sci-success: #22c55e;
    --sci-warning: #f59e0b;
    --sci-danger: #ef4444;
    --sci-purple: #a855f7;
    --sci-cyan: #06b6d4;
}

.sci-calc-wrapper {
    background: linear-gradient(to bottom, var(--sci-bg-dark), var(--sci-bg-card));
    padding: 3rem 1.5rem;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--sci-white);
    line-height: 1.6;
    min-height: 100vh;
}

.sci-calc-wrapper * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.sci-calc-container {
    max-width: 900px;
    margin: 0 auto;
}

/* Header */
.sci-calc-wrapper .calc-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.sci-calc-wrapper .calc-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--sci-white);
    margin-bottom: 1rem;
    background: var(--sci-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sci-calc-wrapper .calc-description {
    font-size: 1.1rem;
    color: var(--sci-gray);
    max-width: 700px;
    margin: 0 auto;
}

/* Calculator Card */
.sci-calc-wrapper .calc-card {
    background: var(--sci-bg-card);
    border: 1px solid var(--sci-border);
    border-radius: 1.5rem;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

/* Display */
.sci-calc-wrapper .calc-display {
    background: var(--sci-bg-display);
    border: 2px solid var(--sci-border);
    border-radius: 1rem;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    min-height: 120px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.sci-calc-wrapper .display-history {
    font-size: 1rem;
    color: var(--sci-muted);
    margin-bottom: 0.5rem;
    min-height: 1.5rem;
    text-align: right;
    word-wrap: break-word;
}

.sci-calc-wrapper .display-current {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--sci-white);
    text-align: right;
    font-family: 'Courier New', monospace;
    word-wrap: break-word;
    line-height: 1.2;
}

/* Mode Toggle */
.sci-calc-wrapper .mode-toggle {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    background: var(--sci-bg-input);
    padding: 0.5rem;
    border-radius: 0.75rem;
}

.sci-calc-wrapper .mode-btn {
    flex: 1;
    padding: 0.75rem 1rem;
    background: transparent;
    border: 1px solid var(--sci-border);
    border-radius: 0.5rem;
    color: var(--sci-muted);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.sci-calc-wrapper .mode-btn:hover {
    border-color: var(--sci-purple);
    color: var(--sci-purple);
}

.sci-calc-wrapper .mode-btn.active {
    background: var(--sci-gradient);
    border-color: transparent;
    color: var(--sci-white);
}

/* Memory Display */
.sci-calc-wrapper .memory-display {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--sci-bg-input);
    border-radius: 0.75rem;
    margin-bottom: 1.5rem;
}

.sci-calc-wrapper .memory-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sci-calc-wrapper .memory-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--sci-muted);
}

.sci-calc-wrapper .memory-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--sci-white);
    font-family: 'Courier New', monospace;
}

.sci-calc-wrapper .memory-buttons {
    display: flex;
    gap: 0.5rem;
}

.sci-calc-wrapper .mem-btn {
    padding: 0.5rem 0.75rem;
    background: var(--sci-bg-card);
    border: 1px solid var(--sci-border);
    border-radius: 0.375rem;
    color: var(--sci-gray);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.sci-calc-wrapper .mem-btn:hover {
    border-color: var(--sci-cyan);
    color: var(--sci-cyan);
    transform: translateY(-2px);
}

.sci-calc-wrapper .mem-btn:active {
    transform: translateY(0);
}

/* Calculator Buttons */
.sci-calc-wrapper .calc-buttons {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.sci-calc-wrapper .calc-btn {
    padding: 1.25rem;
    background: var(--sci-bg-input);
    border: 2px solid var(--sci-border);
    border-radius: 0.75rem;
    color: var(--sci-white);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
}

.sci-calc-wrapper .calc-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

.sci-calc-wrapper .calc-btn:active {
    transform: translateY(0);
}

/* Number Buttons */
.sci-calc-wrapper .number-btn {
    background: var(--sci-bg-card);
    border-color: var(--sci-border-light);
    font-size: 1.3rem;
}

.sci-calc-wrapper .number-btn:hover {
    border-color: var(--sci-purple);
    background: rgba(168, 85, 247, 0.1);
}

.sci-calc-wrapper .span-2 {
    grid-column: span 2;
}

/* Operator Buttons */
.sci-calc-wrapper .operator-btn {
    background: var(--sci-gradient-2);
    border-color: transparent;
    font-size: 1.5rem;
}

.sci-calc-wrapper .operator-btn:hover {
    opacity: 0.9;
}

/* Function Buttons */
.sci-calc-wrapper .function-btn {
    background: var(--sci-gradient);
    border-color: transparent;
    font-size: 0.95rem;
}

.sci-calc-wrapper .function-btn:hover {
    opacity: 0.9;
}

/* Clear Buttons */
.sci-calc-wrapper .clear-btn {
    background: var(--sci-gradient-danger);
    border-color: transparent;
    font-weight: 700;
}

.sci-calc-wrapper .clear-btn:hover {
    opacity: 0.9;
}

/* Equals Button */
.sci-calc-wrapper .equals-btn {
    background: var(--sci-gradient-3);
    border-color: transparent;
    font-size: 1.75rem;
    font-weight: 700;
}

.sci-calc-wrapper .equals-btn:hover {
    opacity: 0.9;
}

/* History Panel */
.sci-calc-wrapper .history-panel {
    background: var(--sci-bg-input);
    border: 1px solid var(--sci-border);
    border-radius: 1rem;
    padding: 1.5rem;
}

.sci-calc-wrapper .history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--sci-border);
}

.sci-calc-wrapper .history-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--sci-white);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sci-calc-wrapper .history-header h3 i {
    color: var(--sci-purple);
}

.sci-calc-wrapper .btn-clear-history {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--sci-bg-card);
    border: 1px solid var(--sci-border);
    border-radius: 0.5rem;
    color: var(--sci-muted);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.sci-calc-wrapper .btn-clear-history:hover {
    border-color: var(--sci-danger);
    color: var(--sci-danger);
}

.sci-calc-wrapper .history-list {
    max-height: 300px;
    overflow-y: auto;
}

.sci-calc-wrapper .history-empty {
    text-align: center;
    color: var(--sci-muted);
    padding: 2rem;
    font-style: italic;
}

.sci-calc-wrapper .history-item {
    padding: 1rem;
    background: var(--sci-bg-card);
    border: 1px solid var(--sci-border);
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.sci-calc-wrapper .history-item:hover {
    border-color: var(--sci-purple);
    transform: translateX(5px);
}

.sci-calc-wrapper .history-expression {
    font-size: 0.95rem;
    color: var(--sci-muted);
    margin-bottom: 0.25rem;
    font-family: 'Courier New', monospace;
}

.sci-calc-wrapper .history-result {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--sci-white);
    font-family: 'Courier New', monospace;
}

/* Info Cards */
.sci-calc-wrapper .info-card {
    background: var(--sci-bg-card);
    border: 1px solid var(--sci-border);
    border-radius: 1.5rem;
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.sci-calc-wrapper .info-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--sci-white);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.sci-calc-wrapper .info-title i {
    color: var(--sci-purple);
}

/* Functions Grid */
.sci-calc-wrapper .functions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.sci-calc-wrapper .function-category {
    background: var(--sci-bg-input);
    border: 1px solid var(--sci-border);
    border-radius: 1rem;
    padding: 1.5rem;
}

.sci-calc-wrapper .function-category h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--sci-white);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sci-calc-wrapper .function-category h3 i {
    color: var(--sci-cyan);
}

.sci-calc-wrapper .function-category ul {
    list-style: none;
    padding: 0;
}

.sci-calc-wrapper .function-category li {
    padding: 0.5rem 0;
    color: var(--sci-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.sci-calc-wrapper .function-category li strong {
    color: var(--sci-white);
    font-family: 'Courier New', monospace;
}

/* Examples Grid */
.sci-calc-wrapper .examples-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.sci-calc-wrapper .example-box {
    background: var(--sci-bg-input);
    border: 1px solid var(--sci-border);
    border-radius: 1rem;
    padding: 1.5rem;
}

.sci-calc-wrapper .example-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--sci-white);
    margin-bottom: 1rem;
}

.sci-calc-wrapper .example-calc {
    margin-bottom: 0.75rem;
}

.sci-calc-wrapper .example-calc code {
    display: block;
    padding: 0.5rem;
    background: var(--sci-bg-card);
    border-radius: 0.375rem;
    color: var(--sci-cyan);
    font-family: 'Courier New', monospace;
    margin-bottom: 0.5rem;
}

.sci-calc-wrapper .example-desc {
    font-size: 0.85rem;
    color: var(--sci-muted);
    font-style: italic;
}

/* Shortcuts Grid */
.sci-calc-wrapper .shortcuts-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1rem;
}

.sci-calc-wrapper .shortcut-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--sci-bg-input);
    border: 1px solid var(--sci-border);
    border-radius: 0.75rem;
    text-align: center;
}

.sci-calc-wrapper .shortcut-item kbd {
    padding: 0.5rem 1rem;
    background: var(--sci-bg-card);
    border: 2px solid var(--sci-border-light);
    border-radius: 0.375rem;
    color: var(--sci-white);
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    font-weight: 600;
    box-shadow: 0 2px 0 var(--sci-border);
}

.sci-calc-wrapper .shortcut-item span {
    font-size: 0.85rem;
    color: var(--sci-muted);
}

/* FAQ */
.sci-calc-wrapper .faq-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.sci-calc-wrapper .faq-item {
    background: var(--sci-bg-input);
    border: 1px solid var(--sci-border);
    border-radius: 0.75rem;
    padding: 1.5rem;
}

.sci-calc-wrapper .faq-item h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--sci-white);
    margin-bottom: 0.75rem;
}

.sci-calc-wrapper .faq-item p {
    font-size: 0.95rem;
    color: var(--sci-muted);
    line-height: 1.7;
    margin-bottom: 0.5rem;
}

.sci-calc-wrapper .faq-item p:last-child {
    margin-bottom: 0;
}

.sci-calc-wrapper .faq-item code {
    padding: 0.25rem 0.5rem;
    background: var(--sci-bg-card);
    border-radius: 0.25rem;
    color: var(--sci-cyan);
    font-family: 'Courier New', monospace;
}

/* Responsive */
@media (max-width: 768px) {
    .sci-calc-wrapper {
        padding: 2rem 1rem;
    }

    .sci-calc-wrapper .calc-title {
        font-size: 2rem;
    }

    .sci-calc-wrapper .calc-card {
        padding: 1.5rem;
    }

    .sci-calc-wrapper .display-current {
        font-size: 2rem;
    }

    .sci-calc-wrapper .calc-buttons {
        gap: 0.5rem;
    }

    .sci-calc-wrapper .calc-btn {
        padding: 1rem;
        font-size: 0.95rem;
    }

    .sci-calc-wrapper .number-btn {
        font-size: 1.1rem;
    }

    .sci-calc-wrapper .operator-btn {
        font-size: 1.25rem;
    }

    .sci-calc-wrapper .equals-btn {
        font-size: 1.5rem;
    }

    .sci-calc-wrapper .memory-display {
        flex-direction: column;
        gap: 0.75rem;
    }

    .sci-calc-wrapper .functions-grid {
        grid-template-columns: 1fr;
    }

    .sci-calc-wrapper .examples-grid {
        grid-template-columns: 1fr;
    }

    .sci-calc-wrapper .shortcuts-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 480px) {
    .sci-calc-wrapper .calc-title {
        font-size: 1.75rem;
    }

    .sci-calc-wrapper .mode-toggle {
        gap: 0.25rem;
    }

    .sci-calc-wrapper .mode-btn {
        padding: 0.5rem;
        font-size: 0.8rem;
    }

    .sci-calc-wrapper .memory-buttons {
        flex-wrap: wrap;
    }

    .sci-calc-wrapper .calc-buttons {
        gap: 0.375rem;
    }

    .sci-calc-wrapper .calc-btn {
        padding: 0.75rem;
        font-size: 0.85rem;
    }

    .sci-calc-wrapper .function-btn {
        font-size: 0.8rem;
    }

    .sci-calc-wrapper .shortcuts-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}