* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

:root {
    --primary: #4361ee;
    --secondary: #3a0ca3;
    --accent: #7209b7;
    --light: #f8f9fa;
    --dark: #212529;
    --success: #4cc9f0;
    --gray: #6c757d;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --radius: 16px;
    --transition: all 0.3s ease;
    
    /* Theme variables */
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --text-color: #212529;
    --border-color: #e0e0e0;
    --input-bg: #fafafa;
    --footer-bg: #ffffff;
    --result-bg: linear-gradient(135deg, #4361ee, #3a0ca3);
    --modal-bg: rgba(255, 255, 255, 0.95);
    --blur-bg: blur(10px);
}

/* Dark theme variables */
body.dark-theme {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --border-color: #333333;
    --input-bg: #2d2d2d;
    --footer-bg: #1a1a1a;
    --result-bg: linear-gradient(135deg, #3a56d4, #2a0a93);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    --modal-bg: rgba(30, 30, 30, 0.95);
}

/* RGB Animated Text */
@keyframes rgb-animation {
    0% { color: #ff0000; }
    25% { color: #00ff00; }
    50% { color: #0000ff; }
    75% { color: #ff00ff; }
    100% { color: #ff0000; }
}

.rgb-text {
    animation: rgb-animation 3s infinite linear;
    font-weight: 700;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

/* Dark theme adjustment for RGB text */
body.dark-theme .rgb-text {
    text-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

body {
    background: var(--bg-color);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-color);
    transition: background-color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding-top: 20px;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo i {
    font-size: 2.5rem;
    color: var(--primary);
    background: var(--card-bg);
    padding: 15px;
    border-radius: 50%;
    box-shadow: var(--shadow);
}

.title-section {
    text-align: center;
}

.main-title {
    color: var(--secondary);
    font-size: 3rem;
    margin-bottom: 5px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.byline {
    color: var(--primary);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.tagline {
    color: var(--gray);
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto 20px auto;
}

/* Theme Toggle Button */
.theme-toggle-container {
    display: flex;
    justify-content: center;
    margin-bottom: 30px;
}

.theme-toggle {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 50px;
    padding: 12px 25px;
    font-weight: 600;
    color: var(--text-color);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
}

.theme-toggle:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.theme-toggle .light-icon {
    color: #FFD700;
}

.theme-toggle .dark-icon {
    color: #4361ee;
}

.converter-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 30px;
    align-items: center;
    margin-bottom: 40px;
}

@media (max-width: 768px) {
    .converter-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .main-title {
        font-size: 2.5rem;
    }
    
    .logo-container {
        flex-direction: column;
        gap: 15px;
    }
}

.converter-box {
    background: var(--card-bg);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.converter-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.converter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.converter-title {
    font-size: 1.5rem;
    color: var(--secondary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.converter-type {
    font-size: 0.9rem;
    color: var(--primary);
    background: rgba(67, 97, 238, 0.1);
    padding: 5px 15px;
    border-radius: 20px;
}

.input-group {
    margin-bottom: 25px;
}

.input-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--gray);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-field {
    width: 100%;
    padding: 18px 20px;
    font-size: 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    transition: var(--transition);
    background: var(--input-bg);
    color: var(--text-color);
    font-weight: 600;
}

.input-field:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--card-bg);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

.unit-selector {
    position: absolute;
    right: 10px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 12px 15px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--secondary);
    cursor: pointer;
    transition: var(--transition);
}

.unit-selector:hover {
    border-color: var(--primary);
}

.swap-btn {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    border: none;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    align-self: center;
    justify-self: center;
}

.swap-btn:hover {
    transform: rotate(180deg) scale(1.1);
    box-shadow: 0 10px 25px rgba(67, 97, 238, 0.4);
}

.result-box {
    background: var(--result-bg);
    color: white;
    padding: 25px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 30px;
    position: relative;
}

.result-label {
    font-size: 1rem;
    opacity: 0.9;
    margin-bottom: 10px;
}

.result-value {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 5px;
    word-break: break-all;
    padding-right: 70px;
}

.result-formula {
    font-size: 0.9rem;
    opacity: 0.8;
    font-style: italic;
}

.copy-btn {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    border-radius: 10px;
    padding: 12px 18px;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    backdrop-filter: blur(5px);
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-50%) scale(1.05);
}

.copy-btn.copied {
    background: rgba(76, 201, 240, 0.3);
    border-color: var(--success);
}

.copy-btn.copied i {
    color: var(--success);
}

.converter-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 30px;
    justify-content: center;
}

.tab-btn {
    padding: 12px 25px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-weight: 600;
    color: var(--gray);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
    gap: 8px;
}

.tab-btn:hover {
    color: var(--primary);
    transform: translateY(-3px);
    border-color: var(--primary);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    border-color: transparent;
}

.history-section {
    background: var(--card-bg);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-top: 30px;
    border: 1px solid var(--border-color);
}

.history-title {
    font-size: 1.5rem;
    color: var(--secondary);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.history-list {
    max-height: 200px;
    overflow-y: auto;
}

.history-item {
    display: flex;
    justify-content: space-between;
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.history-item:hover {
    background: rgba(67, 97, 238, 0.05);
}

.history-conversion {
    font-weight: 600;
    color: var(--text-color);
}

.history-time {
    color: var(--gray);
    font-size: 0.9rem;
}

.clear-history {
    background: #ff6b6b;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    margin-top: 15px;
    transition: var(--transition);
}

.clear-history:hover {
    background: #ff5252;
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--modal-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    transform: translateY(20px);
    transition: transform 0.3s ease;
    border: 1px solid var(--border-color);
}

.modal-overlay.active .modal {
    transform: translateY(0);
}

.modal-header {
    padding: 20px 30px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.5rem;
    color: var(--secondary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray);
    cursor: pointer;
    transition: var(--transition);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: rgba(0, 0, 0, 0.05);
    color: var(--primary);
}

.modal-content {
    padding: 30px;
}

/* Connect Modal Styles */
.connect-description {
    color: var(--gray);
    margin-bottom: 30px;
    font-size: 1.1rem;
    line-height: 1.6;
}

/* Updated Social Grid Styles */
.social-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.social-icon {
    background: var(--input-bg);
    border-radius: 12px;
    padding: 20px 15px;
    transition: var(--transition);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-color);
}

.social-icon:hover {
    transform: translateY(-5px);
    background: rgba(67, 97, 238, 0.1);
    border-color: var(--primary);
    box-shadow: 0 10px 25px rgba(67, 97, 238, 0.1);
}

.social-icon img {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.social-icon span {
    font-weight: 600;
    font-size: 0.95rem;
}

/* About Modal Styles */
.about-content {
    line-height: 1.8;
}

.about-content h3 {
    color: var(--secondary);
    margin: 25px 0 15px 0;
    font-size: 1.3rem;
}

.about-content ul {
    margin-left: 20px;
    margin-bottom: 20px;
}

.about-content li {
    margin-bottom: 10px;
}

.translate-btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    margin-top: 20px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.translate-btn:hover {
    background: var(--secondary);
    transform: translateY(-2px);
}

.english-content {
    display: none;
}

footer {
    text-align: center;
    margin-top: 50px;
    padding: 30px;
    color: var(--gray);
    font-size: 0.9rem;
    background: var(--footer-bg);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    margin: 15px 0;
}

.footer-links button {
    background: none;
    border: none;
    color: var(--primary);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    padding: 8px 15px;
    border-radius: 8px;
    font-weight: 500;
}

.footer-links button:hover {
    color: var(--accent);
    background: rgba(67, 97, 238, 0.1);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .main-title {
        font-size: 2.2rem;
    }
    
    .byline {
        font-size: 1rem;
    }
    
    .converter-box {
        padding: 20px;
    }
    
    .input-field {
        font-size: 1.2rem;
        padding: 15px;
    }
    
    .unit-selector {
        padding: 10px;
        font-size: 0.9rem;
    }
    
    .result-value {
        font-size: 1.8rem;
        padding-right: 0;
        margin-bottom: 15px;
    }
    
    .copy-btn {
        position: relative;
        top: auto;
        right: auto;
        transform: none;
        margin-top: 15px;
        width: 100%;
        justify-content: center;
    }
    
    .social-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .modal {
        width: 95%;
        max-height: 90vh;
    }
}

@media (max-width: 480px) {
    .social-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 10px;
    }
    
    .main-title {
        font-size: 1.8rem;
    }
}

/* Animation for result update */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

.updated {
    animation: pulse 0.5s ease;
}