/* Reset et base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* Effets de particules animées */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.3) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
    z-index: -1;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    33% { transform: translateY(-20px) rotate(1deg); }
    66% { transform: translateY(10px) rotate(-1deg); }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding: 1.5rem 0;
    position: relative;
    z-index: 100;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.header-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.logo a {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #ffffff 0%, #f0f0f0 50%, #ffffff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    transition: all 0.3s ease;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.5);
    letter-spacing: -1px;
}

.logo a:hover {
    transform: scale(1.1) translateY(-2px);
    filter: drop-shadow(0 10px 20px rgba(255, 255, 255, 0.3));
}

.tagline {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1rem;
    margin-top: 0.5rem;
    font-weight: 300;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Main content */
.main {
    padding: 2rem 0;
}

/* Hero section */
.hero {
    text-align: center;
    padding: 4rem 0;
    margin-bottom: 4rem;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.5; }
    50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.8; }
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #ffffff 0%, #f0f0f0 50%, #ffffff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.5);
    letter-spacing: -3px;
    position: relative;
    z-index: 2;
}

.hero-description {
    font-size: 1.4rem;
    color: rgba(255, 255, 255, 0.9);
    max-width: 700px;
    margin: 0 auto;
    font-weight: 300;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: relative;
    z-index: 2;
}

/* URL Shortener */
.url-shortener {
    margin-bottom: 4rem;
}

.shortener-card {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(20px);
    border-radius: 30px;
    padding: 3rem;
    box-shadow: 
        0 25px 50px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.3);
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

.shortener-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

.shortener-card h3 {
    font-size: 2.2rem;
    margin-bottom: 2.5rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.95);
    font-weight: 600;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: relative;
    z-index: 2;
}

/* Form */
.shorten-form {
    margin-bottom: 2rem;
}

.input-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.input-group input {
    flex: 1;
    padding: 1.2rem 1.8rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 15px;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    backdrop-filter: blur(10px);
    position: relative;
    z-index: 2;
}

.input-group input::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.input-group input:focus {
    outline: none;
    border-color: rgba(255, 255, 255, 0.6);
    box-shadow: 
        0 0 0 3px rgba(255, 255, 255, 0.2),
        0 10px 30px rgba(0, 0, 0, 0.2);
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

/* Buttons */
.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0.1) 100%);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
    position: relative;
    z-index: 2;
    font-weight: 600;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 
        0 15px 35px rgba(0, 0, 0, 0.2),
        0 0 0 1px rgba(255, 255, 255, 0.4);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.3) 0%, rgba(255, 255, 255, 0.2) 100%);
}

.btn-secondary {
    background: #f8f9fa;
    color: #333;
    border: 2px solid #e1e5e9;
}

.btn-secondary:hover {
    background: #e9ecef;
    border-color: #dee2e6;
}

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

/* Spinner */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Message de connexion */
.login-prompt {
    text-align: center;
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.95rem;
    margin-bottom: 1rem;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.auth-links {
    text-align: center;
    margin-bottom: 1rem;
}

.auth-links p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
    margin: 0;
}

.auth-link {
    color: rgba(255, 255, 255, 1);
    text-decoration: none;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.auth-link:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

/* Results */
.result {
    margin-top: 2rem;
    position: relative;
    z-index: 2;
}

.result-success {
    background: rgba(76, 175, 80, 0.2);
    border: 2px solid rgba(76, 175, 80, 0.3);
    border-radius: 20px;
    padding: 2rem;
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(76, 175, 80, 0.2);
}

.result-success h4 {
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: 1.5rem;
    font-size: 1.4rem;
    font-weight: 600;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.url-display {
    margin-bottom: 1.5rem;
}

.url-display label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.8rem;
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.1rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.url-copy {
    display: flex;
    gap: 0.5rem;
}

.url-copy input {
    flex: 1;
    padding: 1rem 1.2rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.1);
    font-family: monospace;
    font-size: 1rem;
    color: white;
    backdrop-filter: blur(10px);
}

.url-copy input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.url-info {
    background: rgba(255, 255, 255, 0.1);
    padding: 1.5rem;
    border-radius: 15px;
    font-size: 1rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.url-info p {
    margin-bottom: 0.8rem;
    color: rgba(255, 255, 255, 0.9);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.url-info p:last-child {
    margin-bottom: 0;
}

/* Error */
.error {
    background: rgba(244, 67, 54, 0.2);
    border: 2px solid rgba(244, 67, 54, 0.3);
    border-radius: 20px;
    padding: 2rem;
    margin-top: 2rem;
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(244, 67, 54, 0.2);
    position: relative;
    z-index: 2;
}

.error h4 {
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: 1.5rem;
    font-size: 1.4rem;
    font-weight: 600;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.error p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.1rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* Features */
.features {
    margin-bottom: 4rem;
    padding: 0 2rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.feature-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    box-shadow: 
        0 15px 30px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.feature-card:hover::before {
    left: 100%;
}

.feature-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 
        0 30px 60px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    filter: drop-shadow(0 5px 15px rgba(255, 255, 255, 0.3));
}

.feature-card h4 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: rgba(255, 255, 255, 0.95);
    font-weight: 600;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.feature-card p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
    font-size: 0.95rem;
    flex-grow: 1;
}

/* Stats */
.stats {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border-radius: 30px;
    padding: 4rem;
    box-shadow: 
        0 25px 50px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.3);
    position: relative;
    overflow: hidden;
}

.stats::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.05) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.stats h3 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 4rem;
    color: rgba(255, 255, 255, 0.95);
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: relative;
    z-index: 2;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.step-number {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.3) 0%, rgba(255, 255, 255, 0.1) 100%);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    position: relative;
    z-index: 2;
}

.step-content h4 {
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
    color: rgba(255, 255, 255, 0.95);
    font-weight: 600;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.step-content p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
    font-size: 1.1rem;
}

/* Error pages */
.error-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
}

.error-content {
    text-align: center;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    max-width: 500px;
}

.error-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.error-content h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: #333;
}

.error-content p {
    color: #666;
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.error-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Styles spécifiques pour les boutons sur les pages d'erreur */
.error-content .btn-secondary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.error-content .btn-secondary:hover {
    background: linear-gradient(135deg, #5a6fd8 0%, #6a4190 100%);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.error-content .btn-primary {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.error-content .btn-primary:hover {
    background: linear-gradient(135deg, #e084f0 0%, #f04a5c 100%);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

/* Footer */
.footer {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding: 3rem 0;
    margin-top: 6rem;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5), transparent);
}

.footer-content {
    text-align: center;
    color: rgba(255, 255, 255, 0.8);
}

.footer-content p {
    margin-bottom: 0.8rem;
    font-size: 1.1rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.footer-content p:last-child {
    margin-bottom: 0;
    font-weight: 300;
}

/* Responsive */
@media (max-width: 1200px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
}

@media (max-width: 900px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {
    .header {
        padding: 1rem 0;
    }
    
    .logo a {
        font-size: 2rem;
    }
    
    .tagline {
        font-size: 0.9rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-description {
        font-size: 1.1rem;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .url-copy {
        flex-direction: column;
    }
    
    .error-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .feature-card {
        min-height: auto;
        padding: 1.5rem;
    }
    
    .steps {
        grid-template-columns: 1fr;
    }
    
    .step {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .shortener-card,
    .stats {
        padding: 1.5rem;
    }
    
    .hero {
        padding: 2rem 0;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
}