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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: #fafafa;
    min-height: 100vh;
    color: #1a1a1a;
    -webkit-font-smoothing: antialiased;
}

.btn-back {
    position: fixed;
    top: 20px;
    left: 20px;
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid #e5e5e5;
    color: #525252;
    padding: 10px 18px;
    border-radius: 10px;
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
    z-index: 50;
    backdrop-filter: blur(8px);
}

.btn-back:hover {
    background: #fff;
    color: #1a1a1a;
    border-color: #d4d4d4;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 80px 32px 60px;
}

.header {
    text-align: center;
    margin-bottom: 48px;
    animation: fadeIn 0.6s ease-out;
}

.header h1 {
    font-size: 40px;
    font-weight: 800;
    color: #0a0a0a;
    letter-spacing: -0.03em;
    margin-bottom: 12px;
}

.header p {
    font-size: 16px;
    color: #737373;
    font-weight: 400;
}

.file-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    animation: fadeIn 0.6s ease-out 0.1s backwards;
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #fff;
    border: 1px solid #e5e5e5;
    border-radius: 12px;
    padding: 20px 24px;
    transition: all 0.2s;
}

.file-item:hover {
    border-color: #d4d4d4;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.file-info {
    display: flex;
    align-items: center;
    gap: 16px;
}

.file-type {
    background: #f5f5f5;
    color: #525252;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.file-name {
    font-size: 15px;
    font-weight: 600;
    color: #0a0a0a;
}

.file-link {
    color: #0a0a0a;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 16px;
    background: #f5f5f5;
    border-radius: 8px;
    transition: all 0.2s;
    white-space: nowrap;
}

.file-link:hover {
    background: #0a0a0a;
    color: #fff;
}

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

@media (max-width: 768px) {
    .container {
        padding: 70px 16px 40px;
    }

    .header h1 {
        font-size: 28px;
    }

    .file-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
        padding: 16px 20px;
    }

    .btn-back {
        top: 12px;
        left: 12px;
        padding: 8px 14px;
        font-size: 13px;
    }
}