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

:root {
    /* Pastel Color Palette */
    --pastel-pink: #FFB5C2;
    --pastel-lavender: #D4BAFF;
    --pastel-blue: #B5D9FF;
    --pastel-mint: #B5FFDB;
    --pastel-peach: #FFD4B5;
    --pastel-yellow: #FFF4B5;
    
    /* UI Colors */
    --primary: #A8DAFF;
    --primary-dark: #7AC5FF;
    --secondary: #FFB5E8;
    --accent: #CBAEFF;
    --background: #FFF8F0;
    --card-bg: #FFFFFF;
    --text-primary: #4A4A4A;
    --text-secondary: #7A7A7A;
    --border: #E8D9FF;
    --shadow: rgba(168, 218, 255, 0.15);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #FFF8F0 0%, #FFE8F5 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Navbar Styles */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 2px solid var(--border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-dark);
}

.logo-icon {
    width: 32px;
    height: 32px;
    stroke: var(--primary-dark);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.nav-menu a:hover {
    background: var(--primary);
    color: white;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--primary-dark);
    border-radius: 2px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.hero-title {
    font-size: 3rem;
    background: linear-gradient(135deg, var(--primary-dark), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    font-weight: 800;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Card Styles */
.card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: 0 8px 30px var(--shadow);
    border: 2px solid var(--border);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px var(--shadow);
}

/* Generator Section */
.generator-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.qr-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.url-input,
.size-select {
    padding: var(--spacing-sm);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: var(--transition);
    background: white;
}

.url-input:focus,
.size-select:focus {
    outline: none;
    border-color: var(--primary-dark);
    box-shadow: 0 0 0 3px rgba(168, 218, 255, 0.2);
}

/* Buttons */
.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-icon {
    width: 20px;
    height: 20px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(168, 218, 255, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary), var(--accent));
    color: white;
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(255, 181, 232, 0.4);
}

.btn-clear {
    background: linear-gradient(135deg, #FFB5B5, #FFD4B5);
    color: white;
    font-size: 0.9rem;
    padding: var(--spacing-xs) var(--spacing-sm);
}

.btn-clear:hover {
    transform: translateY(-2px);
}

/* QR Result */
.qr-result {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.qr-display {
    display: flex;
    justify-content: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--pastel-blue), var(--pastel-lavender));
    border-radius: var(--radius-md);
    margin: var(--spacing-md) 0;
}

.qr-display img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    background: white;
    padding: var(--spacing-sm);
}

.qr-info {
    margin-bottom: var(--spacing-md);
}

.qr-url {
    font-weight: 600;
    color: var(--primary-dark);
    word-break: break-all;
    margin-bottom: var(--spacing-xs);
}

.qr-date {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* History Section */
.history-section {
    margin-bottom: var(--spacing-xl);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.section-header h2 {
    font-size: 2rem;
    color: var(--text-primary);
}

.history-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.history-item {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    border: 2px solid var(--border);
    transition: var(--transition);
    cursor: pointer;
}

.history-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px var(--shadow);
    border-color: var(--primary);
}

.history-item img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    background: white;
    padding: var(--spacing-xs);
}

.history-item-url {
    font-size: 0.9rem;
    color: var(--text-primary);
    font-weight: 600;
    word-break: break-all;
    margin-bottom: var(--spacing-xs);
}

.history-item-date {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.history-item-actions {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.history-item-actions button {
    flex: 1;
    padding: var(--spacing-xs);
    font-size: 0.85rem;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* About Section */
.about-section {
    margin-bottom: var(--spacing-xl);
}

.about-section h2 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.about-section p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.feature {
    text-align: center;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--pastel-blue), var(--pastel-mint));
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.feature:hover {
    transform: scale(1.05);
}

.feature svg {
    width: 40px;
    height: 40px;
    margin: 0 auto var(--spacing-sm);
    stroke: white;
}

.feature h4 {
    color: white;
    margin-bottom: var(--spacing-xs);
}

.feature p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.9rem;
    margin: 0;
}

/* Footer */
.footer {
    background: rgba(255, 255, 255, 0.8);
    text-align: center;
    padding: var(--spacing-lg);
    border-top: 2px solid var(--border);
    color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        flex-direction: column;
        gap: 0;
        padding: var(--spacing-md);
        box-shadow: 0 5px 20px var(--shadow);
        max-height: 0;
        overflow: hidden;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        max-height: 300px;
    }
    
    .nav-menu li {
        padding: var(--spacing-sm) 0;
        border-bottom: 1px solid var(--border);
    }
    
    .nav-menu li:last-child {
        border-bottom: none;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .generator-section {
        grid-template-columns: 1fr;
    }
    
    .history-grid {
        grid-template-columns: 1fr;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .hero {
        padding: var(--spacing-md) 0;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .card {
        padding: var(--spacing-md);
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
}

/* Smooth Scroll */
html {
    scroll-behavior: smooth;
}

/* Loading Animation */
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s linear infinite;
}