/* CSS Variables for colors - easier theme switching */ :root { --color-body-bg: #f3f4f6; --color-panel-bg: #ffffff; --color-display-bg: #4a5568; --color-display-text: #e2e8f0; --color-previous-operand: #a0aec0; --color-button-bg: #edf2f7; --color-button-text: #2d3748; --color-operator-bg: #90cdf4; --color-operator-text: #2c5282; --color-equals-bg: #68d391; --color-equals-text: #2f855a; --color-clear-bg: #fc8181; --color-clear-text: #c53030; --color-backspace-bg: #a0aec0; --color-backspace-text: #2d3748; --color-history-item-bg: #edf2f7; --color-history-item-text: #4a5568; --color-history-title: #2d3748; --color-toggle-bg-light: #e2e8f0; --color-toggle-text-light: #4a5568; --color-toggle-bg-dark: #4a5568; --color-toggle-text-dark: #e2e8f0; /* Highlight color for keyboard input */ --color-active-key-highlight: #d1d5db; /* A light gray */ } /* Dark Mode styles applied when 'dark-mode' class is on */ html.dark-mode { --color-body-bg: #1a202c; --color-panel-bg: #2d3748; --color-display-bg: #1a202c; --color-display-text: #e2e8f0; --color-previous-operand: #cbd5e0; --color-button-bg: #4a5568; --color-button-text: #e2e8f0; --color-operator-bg: #63b3ed; --color-operator-text: #e2e8f0; --color-equals-bg: #48bb78; --color-equals-text: #e2e8f0; --color-clear-bg: #e53e3e; --color-clear-text: #e2e8f0; --color-backspace-bg: #718096; --color-backspace-text: #e2e8f0; --color-history-item-bg: #4a5568; --color-history-item-text: #e2e8f0; --color-history-title: #e2e8f0; --color-toggle-bg-light: #2d3748; --color-toggle-text-light: #e2e8f0; --color-active-key-highlight: #6b7280; /* A darker gray for dark mode highlight */ } body { font-family: "Inter", sans-serif; background-color: var(--color-body-bg); /* Use CSS variable */ display: flex; flex-direction: column; /* Changed to column to stack main-container and footer */ justify-content: center; align-items: center; min-height: 100vh; margin: 0; padding: 1rem; box-sizing: border-box; transition: background-color 0.3s ease; /* Smooth transition for theme change */ position: relative; /* Make body a positioning context for the toggle */ } .main-container { display: flex; gap: 2rem; flex-wrap: wrap; justify-content: center; align-items: flex-start; max-width: 1000px; width: 100%; flex-grow: 1; /* Allow main content to grow and push footer down */ margin-top: 3rem; /* Add margin to prevent content from being hidden by the toggle */ } .calculator { background-color: var(--color-panel-bg); /* Use CSS variable */ border-radius: 1.5rem; box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1); overflow: hidden; width: 90%; max-width: 360px; padding: 1.5rem; flex-shrink: 0; display: flex; flex-direction: column; transition: background-color 0.3s ease; } .display { background-color: var(--color-display-bg); /* Use CSS variable */ color: var(--color-display-text); /* Use CSS variable */ padding: 1.5rem 1rem; text-align: right; font-size: 2.5rem; border-radius: 0.75rem; margin-bottom: 1.5rem; word-wrap: break-word; height: 7rem; /* Fixed height for display */ display: flex; flex-direction: column; justify-content: space-between; overflow: hidden; transition: background-color 0.3s ease, color 0.3s ease; } .previous-operand { font-size: 1rem; color: var(--color-previous-operand); /* Use CSS variable */ min-height: 1.2rem; transition: color 0.3s ease; } .current-operand { font-size: 2.5rem; font-weight: bold; } .buttons { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; flex-grow: 1; } .button { background-color: var(--color-button-bg); /* Use CSS variable */ color: var(--color-button-text); /* Use CSS variable */ padding: 1.5rem 0.5rem; font-size: 1.5rem; border: none; border-radius: 0.75rem; cursor: pointer; transition: background-color 0.2s, transform 0.1s, color 0.3s ease; /* Add color transition */ display: flex; justify-content: center; align-items: center; font-weight: 600; } .button:hover { filter: brightness(0.95); /* Slightly darker on hover */ transform: translateY(-2px); } .button:active, .button.active-key { /* New style for active key highlight */ transform: translateY(0); background-color: var(--color-active-key-highlight); /* Use highlight color */ transition: background-color 0.05s; /* Faster transition for tap effect */ } .span-2 { grid-column: span 2; } .operator { background-color: var(--color-operator-bg); /* Use CSS variable */ color: var(--color-operator-text); /* Use CSS variable */ } .clear { background-color: var(--color-clear-bg); /* Use CSS variable */ color: var(--color-clear-text); /* Use CSS variable */ } .backspace { background-color: var(--color-backspace-bg); /* Use CSS variable */ color: var(--color-backspace-text); /* Use CSS variable */ } .equals { background-color: var(--color-equals-bg); /* Use CSS variable */ color: var(--color-equals-text); /* Use CSS variable */ } /* Adjust hover for specific buttons to use brightness filter for consistency */ .operator:hover, .equals:hover, .clear:hover, .backspace:hover { filter: brightness(0.95); } /* No active-key style for operators, clear, backspace, equals unless explicitly needed */ /* because their active states are defined by their specific background colors */ .history-panel { background-color: var(--color-panel-bg); /* Use CSS variable */ border-radius: 1.5rem; box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1); padding: 1.5rem; width: 90%; max-width: 300px; flex-grow: 1; display: flex; flex-direction: column; transition: background-color 0.3s ease; } .history-panel h2 { font-size: 1.5rem; font-weight: bold; color: var(--color-history-title); /* Use CSS variable */ margin-bottom: 1rem; text-align: center; flex-shrink: 0; transition: color 0.3s ease; } .history-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column-reverse; flex-grow: 1; overflow-y: auto; } .history-list li { background-color: var(--color-history-item-bg); /* Use CSS variable */ border-radius: 0.5rem; padding: 0.75rem 1rem; margin-top: 0.75rem; font-size: 0.9rem; color: var(--color-history-item-text); /* Use CSS variable */ word-wrap: break-word; line-height: 1.3; transition: background-color 0.3s ease, color 0.3s ease; } .history-list li:last-child { margin-top: 0; } /* Theme toggle button specific styles */ #theme-toggle { background-color: var(--color-toggle-bg-light); color: var(--color-toggle-text-light); transition: background-color 0.3s ease, color 0.3s ease; box-shadow: 0 2px 5px rgba(0,0,0,0.1); position: fixed; /* Changed from absolute to fixed to stay in viewport */ top: 1rem; right: 1rem; z-index: 1000; /* Increased z-index to ensure it's always on top */ border: none; padding: 0.75rem; /* Standardized padding */ border-radius: 9999px; /* Full rounded circle */ } #theme-toggle:hover { filter: brightness(0.9); } /* Footer styles */ .footer-note { margin-top: 2rem; /* Space above the footer */ color: var(--color-button-text); /* Use a relevant text color variable */ font-size: 0.8rem; text-align: center; width: 100%; /* Ensure it spans full width */ padding: 0.5rem 1rem; opacity: 0.7; /* Decreased opacity */ transition: color 0.3s ease, opacity 0.3s ease; /* Add opacity transition */ } /* Clear history button styles */ #clear-history-button { background-color: #fca5a5; /* A light red color, similar to clear button */ color: #b91c1c; /* Darker red text */ font-size: 0.9rem; padding: 0.75rem 1.25rem; border-radius: 0.75rem; border: none; cursor: pointer; transition: background-color 0.2s, transform 0.1s, color 0.3s ease; margin-top: 1rem; /* Space from the history panel */ align-self: center; /* Center the button in the history panel */ width: fit-content; /* Adjust width to content */ white-space: nowrap; /* Prevent text wrapping */ } #clear-history-button:hover { background-color: #ef4444; transform: translateY(-1px); } #clear-history-button:active { transform: translateY(0); background-color: #dc2626; } /* Dark mode specific styles for clear history button */ html.dark-mode #clear-history-button { background-color: #ef4444; /* Darker red for dark mode */ color: #e2e8f0; /* Light text */ } html.dark-mode #clear-history-button:hover { background-color: #dc2626; } html.dark-mode #clear-history-button:active { background-color: #b91c1c; } /* Responsive adjustments */ @media (max-width: 768px) { .main-container { flex-direction: column; align-items: center; margin-top: 3rem; /* Keep margin for toggle at top */ } .calculator, .history-panel { width: 95%; max-width: 360px; } .history-panel { margin-top: 2rem; min-height: 200px; height: auto; } .display { font-size: 2rem; padding: 1rem 0.75rem; height: 7rem; /* Keep 7rem height for small screens */ } .previous-operand { font-size: 0.9rem; } .current-operand { font-size: 2rem; } .button { font-size: 1.2rem; padding: 1.2rem 0.5rem; } .buttons { gap: 0.75rem; } /* Adjust toggle position for smaller screens if needed */ #theme-toggle { top: 1rem; /* Consistent top position */ right: 1rem; /* Consistent right position */ padding: 0.75rem; width: 2.5rem; /* Make it a bit smaller */ height: 2.5rem; } #clear-history-button { margin-top: 1rem; /* Adjust margin for smaller screens */ } } /* Fixed Header Styles */ .fixed-header { position: fixed; top: 0; left: 0; width: 10%; margin-top: 1rem; z-index: 100; /* Ensure it's above other content but below popups */ box-shadow: 0 0px 0px rgba(0, 0, 0, 0.1); }