style.css

:root {
    --primary-color: #00AAFF;
    --secondary-color: #00FF6C;
    --button-bg: rgba(255, 255, 255, 0.75);
    --button-text: #333;
    --display-bg: rgba(0, 0, 0, 0.75);
    --display-text: #fff;
    --error-color: #ff4444;
    --calculator-base-width: 350px;
    --calculator-base-height: 600px;
    --calculator-scale: 1;
    --converter-bg: rgba(0, 0, 0, 0.2);
}

* {
    margin: 0;
    padding: 0;
    font-family: "Helvetica Neue", sans-serif;
    box-sizing: border-box;
}

body {
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    position: relative;
    width: calc(var(--calculator-base-width) * var(--calculator-scale));
    height: calc(var(--calculator-base-height) * var(--calculator-scale));
    perspective: 1000px;
    transition: none;
    margin: 0;
}

.flipped {
    transform: rotateY(180deg);
}

.calculator-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: left;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.container.show-history .calculator-inner {
    transform: rotateY(180deg);
}

.calculator-front,
.calculator-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    border-radius: 25px;
    overflow: hidden;
    padding: 25px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease-in-out;
}

.calculator-front {
    transform: rotateY(0deg);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.calculator-back {
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    transform: rotateY(180deg);
    color: white;
    display: flex;
    flex-direction: column;
    align-items: stretch;
}

.history-toggle {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    cursor: pointer;
    z-index: 1;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.history-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.calc-text {
    background: var(--display-bg);
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 15px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    overflow: hidden;
    position: relative;
}

.input-copy {
    position: absolute;
    left: 10px;
    top: 20%;
    z-index: 2;
    font-size: 0.9rem;
}

#user-input {
    font-size: 3rem;
    color: var(--display-text);
    margin: 0;
    text-align: right;
    width: 100%;
    overflow-x: auto;
    white-space: nowrap;
    padding-left: 30px;
}

.copy-icon {
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.2s ease;
}

.copy-icon:hover {
    opacity: 1;
    transform:  scale(1.1);
}

.memory-display {
    background: var(--display-bg);
    color: var(--display-text);
    padding: 3px 10px;
    border-radius: 5px;
    margin-bottom: 5px;
    font-size: 0.8rem;
    opacity: 0.8;
    height: 25px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.copy-icon {
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.2s ease;
    order: -1;
}

.copy-icon:hover {
    opacity: 1;
}

.history-panel {
    color: white;
    height: 100%;
    overflow-y: auto;
}

.history-panel h3 {
    color: white;
    margin-bottom: 15px;
}

#calculation-history {
    list-style: none;
    padding: 0;
    margin: 0;
}

#calculation-history li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

#calculation-history li:hover {
    background: rgba(255, 255, 255, 0.1);
}

.calc-keys {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 10px;
    width: 100%;
    height: auto;
    transition: none;
    margin-top: 10px;
}

button {
    background: var(--button-bg);
    color: #333;
    font-size: 1.5rem;
    border: none;
    border-radius: 70%;
    cursor: pointer;
    height: 65px;
    width: 65px;
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

button:hover {
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    background: rgba(255, 255, 255, 0.3);
}

.button-press {
    animation: buttonPress 0.2s ease;
}

@keyframes buttonPress {
    0% { box-shadow: 0 2px 5px rgba(0,0,0,0.2); }
    50% { 
        box-shadow: 0 1px 3px rgba(0,0,0,0.2);
        background: rgba(255, 255, 255, 0.2);
    }
    100% { box-shadow: 0 2px 5px rgba(0,0,0,0.2); }
}

.key-zero {
    grid-column: span 2;
    width: 100%;
    border-radius: 30px;
}

.key-operate {
    background: rgba(255, 166, 0, 0.75);
    color: white;
}

.key-others {
    background: rgba(255, 99, 71, 0.75);
    color: white;
}



[data-theme="dark"] {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --button-bg: rgba(52, 73, 94, 0.75);
    --button-text: #fff;
    --display-bg: rgba(0, 0, 0, 0.9);
    --display-text: #fff;
}

[data-theme="neon"] {
    --primary-color: #ff00ff;
    --secondary-color: #00ffff;
    --button-bg: rgba(255, 0, 255, 0.2);
    --button-text: #fff;
    --display-bg: rgba(0, 0, 0, 0.9);
    --display-text: #0ff;
}

.top-controls {
    position: absolute;
    top: -45px;
    right: 10px;
    display: flex;
    gap: 10px;
    z-index: 2;
}

.top-control-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.2);
}

.memory-display {
    background: var(--display-bg);
    color: var(--display-text);
    padding: 5px 10px;
    border-radius: 5px;
    margin-bottom: 5px;
    font-size: 0.8rem;
    opacity: 0.8;
    text-align: right;
}

.memory-buttons {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 5px;
    margin-bottom: 5px;
    margin-left: 8px;
    width: 100%;
    height: auto;
    transition: all 0.3s ease-in-out;
}

.memory-btn {
    background: rgba(255, 255, 255, 0.1);
    color: var(--display-text);
    border: none;
    border-radius: 50%;
    font-size: 0.8rem;
    height: 35px;
    width: 35px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.top-control-btn.active {
    background: rgba(255, 255, 255, 0.4);
    transform: scale(1.1);
}

.top-control-btn.shift-left {
    transform: translateX(-50px);
}

.top-control-btn.shift-right {
    transform: translateX(50px);
}

.top-control-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.top-control-btn:hover ~ .settings-panel {
    transform: scale(1.05);
}

.settings-panel {
    position: absolute;
    top: -60px;
    left: calc(100% + 50px);
    background: linear-gradient(
        to bottom right,
        rgba(0, 0, 0, 0.8),
        rgba(20, 20, 20, 0.6)
    );
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 25px;
    border-radius: 25px;
    color: white;
    z-index: 2000;
    width: 320px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: right 0.3s ease;
    display: none;
    z-index: 1000;
}

.settings-panel.show {
    right: 0;
    display: block;
}

.settings-panel h3 {
    margin-bottom: 25px;
    font-size: 1.5rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.setting-group {
    margin-bottom: 20px;
}

.setting-group label {
    display: block;
    margin-bottom: 10px;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.setting-group select,
.setting-group input[type="number"] {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.05);
    color: white;
    font-size: 1rem;
    transition: all 0.3s ease;
    outline: none;
}

.setting-group select:focus,
.setting-group input[type="number"]:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 170, 255, 0.2);
}

.setting-group select option {
    background: #1a1a1a;
    color: white;
}

.setting-group input[type="checkbox"] {
    position: relative;
    width: 50px;
    height: 26px;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 13px;
    cursor: pointer;
    outline: none;
    transition: all 0.3s ease;
}

.setting-group input[type="checkbox"]::before {
    content: '';
    position: absolute;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    top: 2px;
    left: 2px;
    background: white;
    transition: all 0.3s ease;
}

.setting-group input[type="checkbox"]:checked {
    background: var(--primary-color);
}

.setting-group input[type="checkbox"]:checked::before {
    left: 26px;
}

.setting-group select:hover,
.setting-group input[type="number"]:hover {
    background: rgba(255, 255, 255, 0.1);
}

.export-btn {
    width: 100%;
    padding: 10px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin-top: auto;
}

.export-btn:hover {
    filter: brightness(110%);
}

.edu-tooltip {
    position: absolute;
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: 10px;
    border-radius: 5px;
    font-size: 0.9rem;
    max-width: 200px;
    z-index: 4;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.edu-tooltip.show {
    opacity: 1;
}

@media (max-width: 480px) {
    .settings-panel {
        width: 90%;
        right: 5%;
        top: 70px;
    }
}

.top-control-btn.active {
    background: rgba(255, 255, 255, 0.4);
    transform: scale(1.1);
}

.top-control-btn.shift-left {
    transform: translateX(-50px);
}

.top-control-btn.shift-right {
    transform: translateX(50px);
}

.settings-panel {
    right: -280px;
    transition: all 0.3s ease;
}

.settings-panel.show {
    right: 10px;
}

.container.show-history .calculator-inner {
    transform: rotateY(180deg);
}

.container.show-theme .calculator-inner {
    transform: rotateY(180deg);
}

#theme-toggle:hover ~ #history-toggle {
    transform: translateX(-50px);
}

#settings-toggle:hover ~ #theme-toggle {
    transform: translateX(-50px);
}

.input-toggles {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.toggle-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

.toggle-item label {
    font-size: 0.8rem;
    text-align: center;
}

.toggle-item input[type="checkbox"] {
    margin: 0;
}

.preview-result {
    position: absolute;
    right: 10px;
    top: 100%;
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.6);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.scientific-buttons {
    display: none; 
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    margin-bottom: 5px;
    width: 100%;
}

.scientific-mode .scientific-buttons {
    display: grid;
}

.sci-btn {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 1rem;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    height: 45px;
    width: 45px;
    transition: all 0.2s ease;
}

.sci-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.05);
}

.modal {
    position: fixed;
    top: 0;
    left: 210%;
    width: 100%;
    height: 100%;
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    padding: 25px;
    border-radius: 15px;
    width: 90%;
    max-width: 400px;
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.modal-content h3 {
    margin-bottom: 20px;
    font-size: 1.5rem;
    color: var(--primary-color);
}

.theme-inputs {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.color-input {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.color-input label {
    font-size: 0.9rem;
}

.color-input input[type="color"] {
    width: 60px;
    height: 30px;
    border: none;
    border-radius: 5px;
    background: none;
    cursor: pointer;
}

.theme-name {
    margin-top: 10px;
}

.theme-name input[type="text"] {
    width: 100%;
    padding: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.modal-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 20px;
}

.modal-buttons button {
    width: auto;
    height: auto;
    padding: 8px 16px;
    border-radius: 5px;
    font-size: 1rem;
}

#save-theme {
    background: var(--primary-color);
    color: white;
}

#cancel-theme {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.container {
    position: relative;
    width: calc(var(--calculator-base-width) * var(--calculator-scale));
    height: calc(var(--calculator-base-height) * var(--calculator-scale));
    perspective: 1000px;
    transition: none;
    margin: 0;
    z-index: 1;
}

.container.scientific-mode {
    height: calc((var(--calculator-base-height) + 200px) * var(--calculator-scale));
}

.scientific-buttons {
    display: none;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    padding: 5px;
    margin: 10px 0;
    width: 100%;
    opacity: 0;
    transform: translateY(-20px);
    transition: all 0.3s ease-in-out;
    order: 1;
}

.scientific-mode .scientific-buttons {
    display: grid;
    opacity: 1;
    transform: translateY(0);
}

.calculator-front {
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: all 0.3s ease-in-out;
}

.calc-text {
    order: 0;
}

.calc-keys {
    order: 2;
    margin-top: auto;
}

.sci-btn {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 1rem;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    height: 45px;
    width: 45px;
    transition: all 0.2s ease;
}

.sci-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.05);
}

@media (max-width: 480px) {
    .container.scientific-mode {
        height: calc((var(--calculator-base-height) + 170px) * var(--calculator-scale));
    }
    
    .scientific-buttons {
        grid-template-columns: repeat(4, 1fr);
        gap: 6px;
    }
    
    .sci-btn {
        height: 40px;
        width: 40px;
        font-size: 0.9rem;
    }
}

.theme-edu-group {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.theme-edu-group .settings-btn {
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 5px;
    color: white;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.theme-edu-group .toggle-item {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: 50px;
}

.theme-edu-group label {
    font-size: 0.9rem;
    margin: 0;
}

.calculator-front, .calculator-back, button, .settings-panel {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes buttonPress {
    0% { transform: scale(1); }
    50% { 
        transform: scale(0.95);
        box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    }
    100% { transform: scale(1); }
}

.button-press {
    animation: buttonPress 0.2s ease;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

@media (prefers-color-scheme: dark) {
    :root[data-theme="auto"] {
        --primary-color: #2c3e50;
        --secondary-color: #34495e;
        --button-bg: rgba(52, 73, 94, 0.75);
        --button-text: #fff;
    }
}

[data-theme="glass-blue"] {
    --primary-color: rgba(0, 149, 255, 0.7);
    --secondary-color: rgba(0, 255, 234, 0.7);
    --button-bg: rgba(255, 255, 255, 0.1);
    --button-text: white;
    --display-bg: rgba(0, 0, 0, 0.2);
    --display-text: white;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    backdrop-filter: blur(10px);
}

[data-theme="glass-purple"] {
    --primary-color: rgba(147, 51, 234, 0.7);
    --secondary-color: rgba(192, 38, 211, 0.7);
    --button-bg: rgba(255, 255, 255, 0.1);
    --button-text: white;
    --display-bg: rgba(0, 0, 0, 0.2);
    --display-text: white;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    backdrop-filter: blur(10px);
}

[data-theme="sunset"] {
    --primary-color: #FF512F;
    --secondary-color: #F09819;
    --button-bg: rgba(255, 255, 255, 0.15);
    --button-text: white;
    --display-bg: rgba(0, 0, 0, 0.3);
    --display-text: white;
    background: linear-gradient(135deg, #FF512F, #F09819);
}

[data-theme="ocean"] {
    --primary-color: #2193b0;
    --secondary-color: #6dd5ed;
    --button-bg: rgba(255, 255, 255, 0.15);
    --button-text: white;
    --display-bg: rgba(0, 0, 0, 0.3);
    --display-text: white;
    background: linear-gradient(135deg, #2193b0, #6dd5ed);
}

[data-theme="midnight"] {
    --primary-color: #232526;
    --secondary-color: #414345;
    --button-bg: rgba(255, 255, 255, 0.1);
    --button-text: white;
    --display-bg: rgba(0, 0, 0, 0.4);
    --display-text: #00ff95;
    background: linear-gradient(135deg, #232526, #414345);
}

@keyframes buttonGlow {
    0% { box-shadow: 0 0 5px rgba(255, 255, 255, 0.3); }
    50% { box-shadow: 0 0 15px rgba(255, 255, 255, 0.5); }
    100% { box-shadow: 0 0 5px rgba(255, 255, 255, 0.3); }
}

.calc-keys button:active {
    animation: buttonGlow 0.3s ease;
}

@keyframes resultPop {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.result-animation {
    animation: resultPop 0.3s ease;
}



.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--primary-color);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.loading-animation {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

button:focus {
    outline: 3px solid var(--accent-color);
    outline-offset: 2px;
}

@media (prefers-contrast: high) {
    :root {
        --button-bg: #000000;
        --button-text: #ffffff;
        --display-bg: #ffffff;
        --display-text: #000000;
    }
}

.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    padding: 15px;
    z-index: 1000;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
}

.footer-text {
    color: white;
    font-size: 0.9rem;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-link {
    color: white;
    opacity: 0.8;
    transition: all 0.3s ease;
}

.social-link:hover {
    opacity: 1;
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .footer {
        padding: 10px;
    }

    .footer-content {
        flex-direction: column;
        gap: 10px;
    }

    .footer-text {
        font-size: 0.8rem;
    }
}

@media (max-width: 768px) {
    .calculator-wrapper {
        margin-bottom: 80px;
    }
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    color: white;
    font-size: 1.5rem;
    text-decoration: none;
    font-weight: bold;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: white;
    text-decoration: none;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--primary-color);
}

.main-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 8rem;
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    margin-right: 80px;
}

.calculator-section {
    align-self: center;
    position: sticky;
    top: 2rem;
    height: fit-content;
    order: 5;
}

.content-section {
    padding: 1rem;
    order: 1;
    max-width: 800px;
}

.info-section {
    display: grid;
    gap: 2rem;
    margin: 2rem 0;
}

.contact-form {
    display: grid;
    gap: 1rem;
    max-width: 500px;
    margin: 0 auto;
}

.contact-form input,
.contact-form textarea {
    padding: 0.8rem;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

h1, h2, h3 {
    color: white;
    margin-bottom: 1rem;
}

p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

.hero-section {
    position: absolute;
    top: 20px;
    left: 40px;
    margin: 0;
    padding: 10px 10px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 25px;
    max-width: 400px;
    min-height: 200px;
    height: auto;
    text-align: center;
    z-index: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hero-section:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
}

.hero-section h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, #fff, var(--primary-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

.hero-section .subtitle {
    margin-top: 0.5rem;
    margin-bottom: 1rem;
}

.subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.8);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    padding: 10;
    position: absolute;
    left: 40px;
    top: 260px;
    margin: 0;
}

.feature-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 25px;
    border-radius: 20px;
    text-align: center;
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);

}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
}


.calculator-wrapper {
    position: relative;
    z-index: 2;
    margin-top: 2rem;
    margin-left: 10rem;
    margin-right: 10rem;
    transition: all 0.3s ease-in-out;
}

.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.3s;
}

.calculator-loader {
    width: 48px;
    height: 48px;
    border: 5px solid #FFF;
    border-bottom-color: var(--primary-color);
    border-radius: 50%;
    animation: rotation 1s linear infinite;
    margin-bottom: 1rem;
}

@keyframes rotation {
    0% { transform: rotate(0deg) }
    100% { transform: rotate(360deg) }
}

.loader.hide {
    opacity: 0;
    pointer-events: none;
}

.math-facts {
    position: absolute;
    top: 1px;
    right: 20px;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    padding: 20px;
    margin: 20px;
    border-radius: 20px;
    color: white;
    width: 300px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.math-facts.show {
    opacity: 1;
    visibility: visible;
}

.fact-content {
    margin-bottom: 15px;
}

.fact-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.next-fact {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    padding: 10px 15px;
    border-radius: 20px;
    color: white;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    width: 100%;
    backdrop-filter: blur(5px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.next-fact::after {
    content: '✨';
    font-size: 1.1rem;
}

.next-fact:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
}

.next-fact:active {
    transform: translateY(1px);
}

.fact-controls {
    margin-top: 15px;
}



@media (max-width: 480px) {
    .calculator-wrapper {
        margin-left: 150px;
    }

    .settings-panel {
        position: relative !important;
        top: auto !important;
        left: auto !important;
        right: auto !important;
        margin-top: 2rem !important;
        margin-bottom: 5rem !important;
        width: 100% !important;
    }

    .main-content {
        flex-direction: column;
        align-items: center;
        padding: 1rem;
        padding-bottom: 6rem;
        min-height: calc(100vh - 80px);
    }

    .footer {
        background: none;
        backdrop-filter: none;
        margin-bottom: 20px;
    }

    .footer-content {
        justify-content: center;
        gap: 1rem;
    }

    .footer-text {
        display: none;
    }

    .math-facts {
        display: none;
    }
}

.constants-panel {
    display: flex;
    gap: 5px;
    margin-left: 10px;
    align-items: center;
}

.constants-panel button {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    padding: 8px 12px;
    border-radius: 10px;
    color: white;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}

.constants-panel button:hover {
    background: rgba(255, 255, 255, 0.2);
}

.scientific-buttons {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 5px;
    margin-bottom: 10px;
}

[data-constant] {
    font-size: 1rem !important;
    width: auto !important;
    height: auto !important;
}

.container:not(.scientific-mode) .calculator-front {
    display: flex;
    flex-direction: column;
    height: calc(var(--calculator-base-height) * var(--calculator-scale));
}

.container:not(.scientific-mode) .scientific-buttons {
    display: none;
}

.container.scientific-mode {
    height: calc((var(--calculator-base-height) + 200px) * var(--calculator-scale));
}

.container.scientific-mode .calculator-front {
    height: 100%;
    gap: 10px;
}

.container.scientific-mode .scientific-buttons {
    display: grid;
    opacity: 1;
    transform: translateY(0);
}

/* Common styles */
.calculator-front {
    padding: 20px;
    transition: all 0.3s ease-in-out;
}

.calc-text {
    flex: 0 0 auto;
    margin-bottom: 20px;
}

.memory-buttons {
    margin-bottom: 15px;
}

.calc-keys {
    margin-top: auto;
}

/* Ensure memory display is always visible */
.memory-display {
    margin-bottom: 10px;
}

.currency-converter,
.math-facts,
.quick-notes {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 20px;
    margin: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    width: 300px;
    position: absolute;
}


.formula-library {
    width: 300px;
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 20px;
    margin: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    top: 230px;
    right: 18px;
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease-in-out;
    z-index: 10;
}

#formula-category {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    padding: 10px;
    border-radius: 8px;
    color: white;
    width: 100%;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    appearance: none;
    cursor: pointer;
}

#formula-category option {
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: white;
    padding: 10px;
}

#formula-category:hover {
    background: rgba(255, 255, 255, 0.2);
}

#formula-category:focus {
    outline: none;
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.2);
}

#formula-display {
    background: rgba(0, 0, 0, 0.2);
    padding: 15px;
    margin: 10px;
    border-radius: 10px;
}

#formula-display h4 {
    margin: 0 ;
    color: var(--primary-color);
}

.formula-text {
    font-family: monospace;
    margin: 10px 0;
    color: white;
}

.use-formula {
    background: var(--primary-color);
    border: none;
    padding: 8px;
    border-radius: 8px;
    color: white;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.use-formula:hover {
    transform: translateY(-2px);
}

.quick-notes {
    bottom: 70px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: all 0.3s ease-in-out;
}

#calculation-notes {
    width: 100%;
    height: 200px;
    margin: 0 0 10 0;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 8px;
    color: white;
    resize: vertical;
}

.notes-controls {
    display: flex;
    gap: 10px;
}

.notes-controls button {
    flex: 1;
    background: var(--primary-color);
    border: none;
    border-radius: 8px;
    color: white;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.notes-controls button:hover {
    transform: translateY(-2px);
}

@media (max-width: 1402px) {
    .math-facts {
        position: fixed;
        top: 20px;
        right: 20px;
        width: 300px;
        margin: 0;
    }

    .formula-library {
        position: fixed;
        top: 180px;
        right: 20px;
        width: 300px;
        margin: 0;
    }

    .quick-notes {
        position: fixed;
        bottom: 80px;
        right: 20px;
        width: 300px;
        margin: 0;
    }

    .currency-converter {
        position: fixed;
        top: 20px;
        left: 20px;
        width: 300px;
        margin: 0;
    }

    .calculator-wrapper {
        margin: 0 auto;
        position: relative;
        z-index: 1;
    }

    .main-content {
        padding: 2rem;
        display: flex;
        justify-content: center;
    }
}

@media (max-width: 1305px) {
    body {
        display: flex;
        align-items: center;
    }

    .hero-section {
        display: none;
    }

    .features-grid {
        display: none;
    }

    .calculator-section {
        order: 0;
        margin-bottom: 20px;
    }


    .formula-library {
        display: none;
    }

    .quick-notes {
        display: none;
    }

    .math-facts {
        display: none;
    }

    .footer {
        background: none;
        backdrop-filter: none;
        border: none;
    }
    
    .footer-text {
        display: none;
    }

    .social-link {
        font-size: 1.5rem;
        color: rgba(255, 255, 255, 0.8);
    }

}

@media (max-width: 480px) {
    .calculator-wrapper {
        margin: 0.5rem;
        transform: scale(0.8);
    }

    .currency-converter,
    .formula-library,
    .quick-notes {
        padding: 15px;
    }

    .memory-buttons,
    .scientific-buttons {
        gap: 3px;
    }

    button {
        height: 55px;
        width: 55px;
        font-size: 1.2rem;
    }

    .footer {
        padding: 5px;
    }
}