* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    transition: background-color 0.3s, color 0.3s;
}

/* Light Theme (Default) */
:root {
    --primary-color: #3b82f6;
    --secondary-color: #6c757d;
    --background-color: #f4f6ff;
    --card-background: #ffffff;
    --text-color: #2c3e50;
    --hover-color: #3b82f6;
    --modal-overlay: rgba(0, 0, 0, 0.5);
}

/* Dark Theme */
:root.dark-theme {
    --primary-color: #3b82f6;
    --secondary-color: #aaaaaa;
    --background-color: #121212;
    --card-background: #1e1e1e;
    --text-color: #e0e0e0;
    --hover-color: #5a6ae0;
    --modal-overlay: rgba(255, 255, 255, 0.1);
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* Theme Toggle Styles */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

#theme-switch {
    background-color: transparent;
    border: none;
    color: var(--text-color);
    font-size: 24px;
    cursor: pointer;
    transition: transform 0.3s ease;
}

#theme-switch:hover {
    transform: rotate(180deg);
}

.container {
    background-color: var(--card-background);
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    padding: 40px;
    width: 90%;
    max-width: 1000px;
    margin: 40px auto;
}

h1 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 40px;
    font-weight: 700;
    font-size: 2.5rem;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 25px;
}

.tool-card {
    background-color: var(--card-background);
    border: 2px solid transparent;
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.tool-card:hover::before {
    transform: scaleX(1);
}

.tool-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

.tool-card i {
    font-size: 60px;
    color: var(--primary-color);
    margin-bottom: 20px;
    transition: transform 0.3s ease;
}

.tool-card:hover i {
    transform: scale(1.1);
}

.tool-card h2 {
    color: var(--text-color);
    font-size: 1.2rem;
    font-weight: 600;
}

/* Modal Styling */
.modal {
    background-color: var(--modal-overlay);
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
}

.modal-content {
    background-color: var(--card-background);
    margin: 10% auto;
    padding: 30px;
    border-radius: 16px;
    width: 90%;
    max-width: 600px;
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.1);
    position: relative;
}

.close {
    color: var(--secondary-color);
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 30px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s ease;
}

.close:hover {
    color: var(--primary-color);
}

/* Tool Container Styles */
.tool-container {
    text-align: center;
}

.tool-container input, 
.tool-container button {
    margin: 15px 0;
    padding: 12px;
    width: 100%;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
    transition: all 0.3s ease;
}

.tool-container button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    font-weight: 600;
}

.tool-container button:hover {
    background-color: var(--hover-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.crypto-hash-generator {
    display: flex;
    flex-direction: column;
    gap: 20px;
}