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

:root {
    /* Colors from PRD */
    --primary: #667EEA;
    --secondary: #764BA2;
    --background: #F7FAFC;
    --text: #2D3748;
    --success: #48BB78;
    --card-bg: #FFFFFF;
    --error: #F56565;
    --info: #4299E1;
    
    /* Additional colors */
    --muted: #718096;
    --border: #E2E8F0;
    --shadow: rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    --font-secondary: 'Poppins', system-ui, -apple-system, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Container max-width */
    --container-width: 800px;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--text);
    background-color: var(--background);
    min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-secondary);
    font-weight: 600;
    line-height: 1.2;
}

h1 { font-size: 1.25rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.25rem; }

/* Layout Components */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Header */
.header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 1px 3px var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.logo-text h1 {
    margin: 0;
    color: var(--text);
}

.logo-text p {
    font-size: 0.875rem;
    color: var(--muted);
    margin: 0;
}

.stats {
    display: flex;
    gap: var(--spacing-lg);
    font-size: 0.875rem;
    color: var(--muted);
}

@media (max-width: 768px) {
    .stats {
        display: none;
    }
}

/* Main Content */
.main {
    padding: var(--spacing-2xl) 0;
}

/* Hero Section */
.hero {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.hero h2 {
    margin-bottom: var(--spacing-lg);
    color: var(--text);
}

.hero p {
    font-size: 1.125rem;
    color: var(--muted);
    max-width: 600px;
    margin: 0 auto;
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 6px var(--shadow);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
}

.card-header {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.card-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    margin-right: var(--spacing-md);
}

.gradient-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
}

.gradient-secondary {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
}

/* Forms */
.form {
    margin-bottom: var(--spacing-xl);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-lg);
    align-items: end;
}

.expand-input {
    grid-column: 1;
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text);
}

input[type="text"],
input[type="url"] {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: all 0.2s ease;
    background: var(--card-bg);
}

input[type="text"]:focus,
input[type="url"]:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

input[type="text"]:invalid,
input[type="url"]:invalid {
    border-color: var(--error);
}

small {
    font-size: 0.75rem;
    color: var(--muted);
    margin-top: var(--spacing-xs);
    display: block;
}

/* Buttons */
.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    box-shadow: 0 2px 4px rgba(102, 126, 234, 0.2);
}

.btn-primary:hover:not(:disabled) {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
    color: white;
    box-shadow: 0 2px 4px rgba(118, 75, 162, 0.2);
}

.btn-secondary:hover:not(:disabled) {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(118, 75, 162, 0.3);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-copy {
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--muted);
}

.btn-copy:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

/* Result Cards */
.result-card {
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-lg);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.result-card.success {
    background: rgba(72, 187, 120, 0.1);
    border: 1px solid rgba(72, 187, 120, 0.2);
}

.result-card.info {
    background: rgba(66, 153, 225, 0.1);
    border: 1px solid rgba(66, 153, 225, 0.2);
}

.result-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
}

.result-card.success .result-icon {
    background: var(--success);
    color: white;
}

.result-card.info .result-icon {
    background: var(--info);
    color: white;
}

.result-content {
    flex: 1;
}

.result-title {
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.result-card.success .result-title {
    color: #2F855A;
}

.result-card.info .result-title {
    color: #2B6CB0;
}

.result-url {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--card-bg);
    border: 1px solid rgba(72, 187, 120, 0.2);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
}

.result-url code {
    flex: 1;
    font-family: 'SF Mono', Monaco, 'Inconsolata', 'Roboto Mono', monospace;
    font-size: 0.875rem;
    color: #2F855A;
    word-break: break-all;
}

/* URL Details */
.url-details {
    margin-top: var(--spacing-md);
}

.detail-item {
    margin-bottom: var(--spacing-md);
}

.detail-item:last-child {
    margin-bottom: 0;
}

.detail-item label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #2B6CB0;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.detail-value {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.detail-value a {
    color: #2B6CB0;
    text-decoration: underline;
    font-size: 0.875rem;
    word-break: break-all;
    flex: 1;
}

.detail-value a:hover {
    color: #2C5282;
}

.detail-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.detail-stat {
    font-size: 1.125rem;
    font-weight: 600;
    color: #2B6CB0;
}

/* Error Messages */
.error-message {
    color: var(--error);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
    display: none;
}

.error-message.show {
    display: block;
}

/* Footer */
.footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border);
    margin-top: var(--spacing-2xl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-2xl) 0;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-weight: 600;
    color: var(--text);
}

.footer-links {
    display: flex;
    gap: var(--spacing-xl);
}

.footer-links a {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.2s ease;
}

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

.footer-bottom {
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--muted);
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--text);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    animation: slideIn 0.3s ease;
}

.toast.success {
    background: var(--success);
}

.toast.error {
    background: var(--error);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Loading States */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --container-width: 100%;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .card {
        padding: var(--spacing-lg);
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .card {
        padding: var(--spacing-md);
    }
    
    .card-header {
        margin-bottom: var(--spacing-lg);
    }
    
    .hero h2 {
        font-size: 1.75rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for accessibility */
*:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}