/* Page layout */
        body {
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        body > *:not(footer) {
            flex-shrink: 0;
        }

        body > footer {
            margin-top: auto;
        }

        /* Container (1400px like Todo) */
        .calculator-container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 2rem;
        }

        /* Calculator specific styles */
        .calculator-wrapper {
            max-width: 400px;
            margin: 0 auto;
        }

        .calculator-card {
            background: var(--dm-card-bg);
            border: 1px solid var(--dm-border);
            border-radius: 12px;
            padding: 1.5rem;
            box-shadow: var(--dm-shadow-md);
        }

        .calculator-display {
            background: var(--dm-surface);
            border: 2px solid var(--dm-border);
            border-radius: 8px;
            padding: 1.5rem 1rem;
            margin-bottom: 1rem;
            text-align: right;
            min-height: 80px;
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
        }

        .calculator-previous {
            font-size: 0.875rem;
            color: var(--dm-text-muted);
            min-height: 1.25rem;
        }

        .calculator-current {
            font-size: 2rem;
            font-weight: 600;
            color: var(--dm-text);
            overflow-wrap: break-word;
        }

        .calculator-buttons {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 0.5rem;
        }

        .calc-btn {
            padding: 1.25rem;
            font-size: 1.25rem;
            font-weight: 600;
            border: 1px solid var(--dm-border);
            border-radius: 8px;
            background: var(--dm-card-bg);
            color: var(--dm-text);
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .calc-btn:hover {
            background: var(--dm-hover-bg);
            transform: translateY(-2px);
            box-shadow: var(--dm-shadow-md);
        }

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

        .calc-btn-operator {
            background: var(--dm-primary-light);
            color: var(--dm-primary-dark);
            font-weight: 700;
        }

        .calc-btn-operator:hover {
            background: var(--dm-primary);
            color: var(--dm-white);
        }

        .calc-btn-equals {
            background: var(--dm-success);
            color: var(--dm-white);
            grid-column: span 2;
        }

        .calc-btn-equals:hover {
            background: var(--dm-success-dark);
        }

        .calc-btn-clear {
            background: var(--dm-danger-light);
            color: var(--dm-danger-dark);
        }

        .calc-btn-clear:hover {
            background: var(--dm-danger);
            color: var(--dm-white);
        }

        /* Mode toggle */
        .calculator-mode-toggle {
            display: flex;
            gap: 0.5rem;
            justify-content: center;
            margin-bottom: 1rem;
        }

        .mode-btn {
            padding: 0.5rem 1.5rem;
            border: 1px solid var(--dm-border);
            border-radius: 8px;
            background: var(--dm-card-bg);
            color: var(--dm-text);
            cursor: pointer;
            transition: all 0.2s ease;
            font-size: 0.95rem;
            font-weight: 500;
        }

        .mode-btn.active {
            background: var(--dm-primary);
            color: var(--dm-white);
            border-color: var(--dm-primary);
        }

        .mode-btn:hover:not(.active) {
            background: var(--dm-hover-bg);
        }

        /* Angle mode toggle */
        .angle-mode-toggle {
            display: flex;
            gap: 0.25rem;
            margin-bottom: 0.5rem;
        }

        .angle-btn {
            flex: 1;
            padding: 0.35rem;
            font-size: 0.75rem;
            font-weight: 600;
            border: 1px solid var(--dm-border);
            border-radius: 4px;
            background: var(--dm-surface);
            color: var(--dm-text-muted);
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .angle-btn.active {
            background: var(--dm-info);
            color: var(--dm-white);
            border-color: var(--dm-info);
        }

        .angle-btn:hover:not(.active) {
            background: var(--dm-hover-bg);
        }

        /* Scientific buttons grid (8 columns) */
        .calculator-buttons-scientific {
            display: grid;
            grid-template-columns: repeat(8, 1fr);
            gap: 0.35rem;
        }

        .calculator-buttons-scientific .calc-btn {
            padding: 0.9rem 0.5rem;
            font-size: 0.9rem;
        }

        /* Scientific mode - wider calculator */
        .calculator-wrapper.scientific-mode {
            max-width: 650px;
            transition: max-width 0.3s ease;
        }

        /* Function buttons */
        .calc-btn-function {
            background: var(--dm-info-light);
            color: var(--dm-info-dark);
            font-size: 0.85rem;
            font-weight: 600;
        }

        .calc-btn-function:hover {
            background: var(--dm-info);
            color: var(--dm-white);
        }

        /* Memory buttons */
        .calc-btn-memory {
            background: var(--dm-warning-light);
            color: var(--dm-warning-dark);
            font-size: 0.85rem;
            font-weight: 600;
        }

        .calc-btn-memory:hover {
            background: var(--dm-warning);
            color: var(--dm-white);
        }

        /* Constant buttons */
        .calc-btn-constant {
            background: var(--dm-success-light);
            color: var(--dm-success-dark);
            font-weight: 700;
            font-size: 1.1rem;
        }

        .calc-btn-constant:hover {
            background: var(--dm-success);
            color: var(--dm-white);
        }

        /* Memory indicator */
        .memory-indicator {
            position: absolute;
            top: 0.5rem;
            left: 0.5rem;
            font-size: 0.75rem;
            font-weight: 700;
            color: var(--dm-warning);
            background: var(--dm-warning-light);
            padding: 0.25rem 0.5rem;
            border-radius: 4px;
        }

        .calculator-display {
            position: relative;
        }

        /* Toast notification */
        .calc-toast {
            position: fixed;
            bottom: 2rem;
            left: 50%;
            transform: translateX(-50%) translateY(100px);
            background: var(--dm-danger);
            color: var(--dm-white);
            padding: 1rem 1.5rem;
            border-radius: 8px;
            box-shadow: var(--dm-shadow-lg);
            font-size: 0.95rem;
            font-weight: 500;
            z-index: 10000;
            opacity: 0;
            transition: all 0.3s ease;
            max-width: 90%;
            text-align: center;
        }

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

        /* Responsive */
        @media (max-width: 768px) {
            .calculator-container {
                padding: 1rem;
            }

            .calculator-wrapper {
                max-width: 100%;
            }
        }