/* Modern Variables */
:root {
    --primary-color: #6c63ff;
    --secondary-color: #4CAF50;
    --accent-color: #ff6b6b;
    --background-color: #f8f9fa;
    --card-background: #ffffff;
    --text-color: #2d3436;
    --shadow-color: rgba(108, 99, 255, 0.2);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    min-height: 100vh;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--background-color);
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(108, 99, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 90% 80%, rgba(76, 175, 80, 0.1) 0%, transparent 50%);
}

/* Container Styles */
.container {
    max-width: 800px;
    width: 95%;
    background: var(--card-background);
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 15px 30px var(--shadow-color);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

/* Header Styles */
h1 {
    color: var(--primary-color);
    text-align: center;
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    margin-bottom: 2rem;
    position: relative;
    padding-bottom: 10px;
}

h1::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 2px;
}

/* QR Reader Styles */
#reader {
    width: 100%;
    margin: 2rem 0;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

#reader video {
    border-radius: 15px;
}

/* Result Display Styles */
#result {
    margin: 1.5rem 0;
    padding: 1.5rem;
    border: 2px solid var(--shadow-color);
    border-radius: 12px;
    background: rgba(108, 99, 255, 0.05);
    transition: all 0.3s ease;
    font-size: 1.1rem;
    line-height: 1.6;
}

#result:not(:empty) {
    animation: fadeIn 0.5s ease;
}

/* Button Styles */
.button {
    background: var(--primary-color);
    color: white;
    padding: 12px 30px;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    display: block;
    margin: 1.5rem auto;
    box-shadow: 0 5px 15px var(--shadow-color);
}

.button:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px var(--shadow-color);
}

.button:active {
    transform: translateY(0);
}

/* Link Styles */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 15px;
    }

    .container {
        padding: 1.5rem;
        width: 100%;
    }

    #reader {
        margin: 1rem 0;
    }

    .button {
        width: 100%;
        padding: 15px;
    }
}

/* Loading State */
.loading {
    position: relative;
    opacity: 0.7;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 30px;
    height: 30px;
    border: 3px solid var(--shadow-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Success Message Styles */
.success-message {
    background: rgba(76, 175, 80, 0.1);
    border-color: var(--secondary-color);
    color: var(--secondary-color);
    font-weight: 500;
}

/* Error Message Styles */
.error-message {
    background: rgba(255, 107, 107, 0.1);
    border-color: var(--accent-color);
    color: var(--accent-color);
    font-weight: 500;
}