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

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #8b5cf6;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-light: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border: #334155;
    --success: #10b981;
    --error: #ef4444;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-lg: rgba(0, 0, 0, 0.5);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, var(--background) 0%, #1a1f3a 100%);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 2rem 1rem;
    line-height: 1.6;
}

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

header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeIn 0.6s ease-out;
}

header h1 {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.input-section {
    margin-bottom: 2rem;
    animation: fadeIn 0.8s ease-out;
}

.link-form {
    margin-bottom: 1.5rem;
}

.input-group {
    display: flex;
    gap: 1rem;
    background: var(--surface);
    padding: 0.5rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 6px var(--shadow);
    transition: all 0.3s ease;
}

.input-group:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

#linkInput {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    padding: 1rem;
    outline: none;
}

#linkInput::placeholder {
    color: var(--text-muted);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    box-shadow: 0 4px 6px var(--shadow);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px var(--shadow-lg);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.search-section {
    background: var(--surface);
    padding: 0.5rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 6px var(--shadow);
}

#searchInput {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    padding: 1rem;
    outline: none;
}

#searchInput::placeholder {
    color: var(--text-muted);
}

.message {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    animation: slideDown 0.3s ease-out;
}

.message.success {
    background: rgba(16, 185, 129, 0.2);
    border: 1px solid var(--success);
    color: var(--success);
}

.message.error {
    background: rgba(239, 68, 68, 0.2);
    border: 1px solid var(--error);
    color: var(--error);
}

.links-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    animation: fadeIn 1s ease-out;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
    font-size: 1.1rem;
}

.link-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px var(--shadow);
    display: flex;
    flex-direction: column;
    animation: fadeInUp 0.5s ease-out;
}

.link-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px var(--shadow-lg);
    border-color: var(--primary-color);
}

.link-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: var(--surface-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.link-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.link-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.link-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.link-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1rem;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.5;
}

.link-url {
    color: var(--primary-color);
    font-size: 0.85rem;
    text-decoration: none;
    margin-bottom: 1rem;
    word-break: break-all;
    transition: color 0.3s ease;
}

.link-url:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

.link-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.link-date {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.delete-btn {
    background: rgba(239, 68, 68, 0.2);
    color: var(--error);
    border: 1px solid var(--error);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.delete-btn:hover {
    background: var(--error);
    color: white;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .input-group {
        flex-direction: column;
    }

    .btn-primary {
        width: 100%;
    }

    .links-container {
        grid-template-columns: 1fr;
    }
}