@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Space+Grotesk:wght@400;500;600;700&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #8b5cf6;
    --accent: #ec4899;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --dark: #0f172a;
    --dark-light: #1e293b;
    --gray: #64748b;
    --gray-light: #e2e8f0;
    --white: #ffffff;
    --glass: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-strong: rgba(255, 255, 255, 0.15);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--dark);
    color: var(--white);
    min-height: 100vh;
    padding: 0;
    margin: 0;
    overflow-x: hidden;
    position: relative;
}

/* Fond animé avec particules */
.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%);
    overflow: hidden;
}

.particles {
    position: absolute;
    width: 100%;
    height: 100%;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(99, 102, 241, 0.5);
    border-radius: 50%;
    animation: float 15s infinite;
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) translateX(0);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100vh) translateX(100px);
        opacity: 0;
    }
}

/* Grille lumineuse animée */
.grid-overlay {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(99, 102, 241, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
    opacity: 0.3;
}

@keyframes gridMove {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(50px, 50px);
    }
}

.container {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Navigation */
nav {
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(20px);
    background: rgba(15, 23, 42, 0.8);
    border-bottom: 1px solid var(--glass-border);
    margin-bottom: 40px;
    border-radius: 16px;
    margin: 20px;
}

.logo {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-link {
    color: var(--white);
    text-decoration: none;
    padding: 10px 20px;
    background: var(--glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    transition: all 0.3s;
}

.nav-link:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.2);
    transform: translateY(-2px);
}

/* Header */
header {
    text-align: center;
    color: var(--white);
    margin-bottom: 40px;
    animation: fadeInDown 0.6s ease-out;
}

header h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    margin-bottom: 10px;
    background: linear-gradient(135deg, #ffffff 0%, var(--primary-light) 50%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header .subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    color: var(--gray-light);
    margin-bottom: 20px;
}

.formats-info {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin-top: 20px;
}

.format-tag {
    padding: 8px 16px;
    background: var(--glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    color: var(--white);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.3s;
}

.format-tag:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.2);
    transform: translateY(-2px);
}

/* Main Card avec glassmorphism */
.main-card {
    background: var(--glass-strong);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    overflow: hidden;
    animation: fadeInUp 0.6s ease-out;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.card-section {
    padding: 40px;
}

.card-section h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.card-section h2::before {
    content: '';
    width: 4px;
    height: 32px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: 2px;
}

/* Zone d'upload futuriste */
.upload-area {
    border: 3px dashed var(--glass-border);
    border-radius: 20px;
    padding: 60px 40px;
    text-align: center;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(10px);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.2), transparent);
    transition: left 0.6s;
}

.upload-area:hover::before {
    left: 100%;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 20px 60px rgba(99, 102, 241, 0.4);
}

.upload-icon {
    font-size: 64px;
    margin-bottom: 20px;
    display: block;
    animation: float 3s ease-in-out infinite;
    filter: drop-shadow(0 0 20px rgba(99, 102, 241, 0.5));
}

.upload-area h3 {
    font-size: 1.5rem;
    color: var(--white);
    margin-bottom: 12px;
    font-weight: 600;
}

.upload-area p {
    color: var(--gray-light);
    margin-bottom: 20px;
}

.file-input {
    display: none;
}

/* Boutons futuristes */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.6);
}

.btn-success {
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
    color: var(--white);
    box-shadow: 0 10px 30px rgba(16, 185, 129, 0.4);
}

.btn-success:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 40px rgba(16, 185, 129, 0.6);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger) 0%, #dc2626 100%);
    color: var(--white);
    box-shadow: 0 10px 30px rgba(239, 68, 68, 0.4);
}

.btn-danger:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 40px rgba(239, 68, 68, 0.6);
}

.btn-secondary {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    color: var(--white);
}

.btn-secondary:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.2);
    transform: translateY(-3px);
}

/* Fichier actuel avec glassmorphism */
.current-file {
    background: rgba(99, 102, 241, 0.1);
    backdrop-filter: blur(20px);
    padding: 24px;
    border-radius: 16px;
    margin-top: 24px;
    display: none;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    border: 2px solid var(--primary-light);
    animation: slideIn 0.4s ease-out;
}

.current-file.active {
    display: flex;
}

.file-info-container {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 8px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-meta {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    font-size: 0.9rem;
    color: var(--gray-light);
}

.file-actions {
    display: flex;
    gap: 12px;
    flex-shrink: 0;
}

/* Messages de statut futuristes */
.status-message {
    padding: 16px 20px;
    border-radius: 12px;
    margin: 24px 0;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
    animation: slideIn 0.4s ease-out;
    backdrop-filter: blur(10px);
    border: 1px solid;
}

.status-success {
    background: rgba(16, 185, 129, 0.2);
    color: #10b981;
    border-color: rgba(16, 185, 129, 0.5);
}

.status-warning {
    background: rgba(245, 158, 11, 0.2);
    color: #f59e0b;
    border-color: rgba(245, 158, 11, 0.5);
}

.status-error {
    background: rgba(239, 68, 68, 0.2);
    color: #ef4444;
    border-color: rgba(239, 68, 68, 0.5);
}

.status-info {
    background: rgba(99, 102, 241, 0.2);
    color: var(--primary-light);
    border-color: rgba(99, 102, 241, 0.5);
}

/* Actions de conversion avec effets 3D */
.preview-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 24px;
}

.action-card {
    background: var(--glass);
    backdrop-filter: blur(20px);
    padding: 32px;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
    position: relative;
    overflow: hidden;
    perspective: 1000px;
}

.action-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.2) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.4s;
}

.action-card:hover::before {
    opacity: 1;
}

.action-card:hover {
    transform: translateY(-10px) rotateY(2deg) rotateX(-2deg);
    border-color: var(--primary);
    box-shadow: 0 30px 60px rgba(99, 102, 241, 0.4);
}

.action-card h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.3rem;
    color: var(--white);
    margin-bottom: 12px;
    font-weight: 600;
}

.action-card p {
    color: var(--gray-light);
    margin-bottom: 24px;
    line-height: 1.6;
}

.action-card .btn {
    width: 100%;
    justify-content: center;
}

/* Sélecteur de format de sortie */
.format-selector {
    background: var(--glass);
    backdrop-filter: blur(20px);
    border-radius: 16px;
    padding: 24px;
    margin: 24px 0 32px 0;
    border: 1px solid var(--glass-border);
    transition: all 0.3s ease;
    /* Toujours visible si présent */
    display: block !important;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.format-selector h3 {
    margin: 0 0 16px 0;
    color: var(--white);
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.format-buttons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    min-height: 50px;
}

.format-loading {
    color: var(--gray-light);
    font-style: italic;
    padding: 12px;
}

.format-btn {
    padding: 12px 24px;
    border: 2px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.05);
    color: var(--white);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.format-btn::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;
}

.format-btn:hover::before {
    left: 100%;
}

.format-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.format-btn.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-color: var(--primary);
    color: var(--white);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.5);
    transform: translateY(-2px);
}

.format-btn.active:hover {
    box-shadow: 0 6px 25px rgba(99, 102, 241, 0.6);
    transform: translateY(-3px);
}

/* Résultat de conversion */
.conversion-result {
    margin-top: 32px;
    padding: 32px;
    background: rgba(16, 185, 129, 0.1);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    border: 2px solid rgba(16, 185, 129, 0.5);
    display: none;
    animation: slideIn 0.4s ease-out;
}

.conversion-result.active {
    display: block;
}

.result-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.result-header h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.5rem;
    color: var(--white);
    font-weight: 700;
}

.result-content {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.result-url {
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(10px);
    padding: 16px;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    word-break: break-all;
    color: var(--gray-light);
}

/* Loader futuriste */
.loader {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(99, 102, 241, 0.2);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 20px auto;
    display: none;
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.5);
}

.loader.active {
    display: block;
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

/* Responsive */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 15px;
        padding: 15px 20px;
    }

    .container {
        padding: 10px;
    }

    header h1 {
        font-size: 2rem;
    }

    .card-section {
        padding: 24px;
    }

    .upload-area {
        padding: 40px 20px;
    }

    .current-file {
        flex-direction: column;
        align-items: stretch;
    }

    .file-actions {
        justify-content: stretch;
    }

    .file-actions .btn {
        flex: 1;
    }

    .preview-actions {
        grid-template-columns: 1fr;
    }
}