* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    min-height: 100vh;
    color: #1a202c;
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.ip-box {
    position: absolute;
    top: 24px;
    left: 24px;
    background: rgba(255,255,255,0.9);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.12);
    backdrop-filter: blur(10px);
    padding: 12px 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    z-index: 10;
    border: 1px solid rgba(255,255,255,0.3);
    transition: all 0.3s ease;
}
.ip-box:hover {
    box-shadow: 0 12px 40px rgba(0,0,0,0.15);
    transform: translateY(-2px);
}

.center-box {
    margin: 48px auto 32px auto;
    background: rgba(255,255,255,0.98);
    border-radius: 24px;
    box-shadow: 
        0 32px 64px rgba(0,0,0,0.12),
        0 16px 32px rgba(0,0,0,0.08),
        0 8px 16px rgba(0,0,0,0.04);
    backdrop-filter: blur(20px);
    padding: 48px 40px 40px 40px;
    width: 90vw;
    max-width: 480px;
    min-width: 320px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.3);
    box-sizing: border-box;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    animation: slideIn 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    top: 0;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translate(-50%, -45%) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}

.center-box h2 {
    margin: 0 0 24px 0;
    font-size: 2.5rem;
    font-weight: 900;
    letter-spacing: -0.03em;
    color: #2d3748;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.center-box h3 {
    margin: 32px 0 16px 0;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: #4a5568;
}

.center-box p {
    margin: 0 0 24px 0;
    font-size: 1.1rem;
    color: #718096;
    font-weight: 500;
}

.center-box a {
    display: inline-block;
    margin: 8px 6px;
    color: #667eea;
    background: rgba(255,255,255,0.95);
    border-radius: 14px;
    padding: 14px 28px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 
        0 4px 12px rgba(102,126,234,0.15),
        0 2px 6px rgba(102,126,234,0.1);
    border: 2px solid rgba(102,126,234,0.2);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.center-box a::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: left 0.5s;
}

.center-box a:hover::before {
    left: 100%;
}

.center-box a:hover {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    box-shadow: 
        0 12px 32px rgba(102,126,234,0.4),
        0 6px 16px rgba(102,126,234,0.2);
    transform: translateY(-3px) scale(1.02);
    border-color: transparent;
}

.login-form input, .add-user-form input, .add-user-form select {
    display: block;
    width: 100%;
    margin: 12px 0;
    padding: 18px 24px;
    border: 2px solid rgba(255,255,255,0.4);
    border-radius: 16px;
    font-size: 1.1rem;
    font-weight: 500;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 
        0 4px 12px rgba(0,0,0,0.08),
        inset 0 1px 3px rgba(0,0,0,0.05);
    box-sizing: border-box;
    color: #2d3748;
}

.login-form input::placeholder, .add-user-form input::placeholder {
    color: #a0aec0;
    font-weight: 400;
}

.login-form input:focus, .add-user-form input:focus, .add-user-form select:focus {
    border: 2px solid #667eea;
    outline: none;
    box-shadow: 
        0 8px 24px rgba(102,126,234,0.25),
        0 0 0 4px rgba(102,126,234,0.1),
        inset 0 1px 3px rgba(0,0,0,0.05);
    transform: translateY(-2px) scale(1.01);
    background: rgba(255,255,255,1);
}

.login-form button, .add-user-form button, .center-box button, .ip-box button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
    border-radius: 16px;
    padding: 18px 32px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    margin: 20px 0 8px 0;
    box-shadow: 
        0 8px 24px rgba(102,126,234,0.4),
        0 4px 12px rgba(102,126,234,0.2);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    width: 100%;
}

.login-form button::before, .add-user-form button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.6s;
}

.login-form button:hover::before, .add-user-form button:hover::before {
    left: 100%;
}

.login-form button:hover, .add-user-form button:hover, .center-box button:hover, .ip-box button:hover {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
    box-shadow: 
        0 12px 32px rgba(102,126,234,0.5),
        0 6px 16px rgba(102,126,234,0.3);
    transform: translateY(-3px) scale(1.02);
}

.login-form button:active, .add-user-form button:active {
    transform: translateY(-1px) scale(0.98);
    transition: all 0.1s;
}

.error {
    color: #e53e3e;
    background: linear-gradient(135deg, #fed7d7 0%, #feb2b2 100%);
    border-radius: 12px;
    padding: 16px 20px;
    margin-bottom: 20px;
    font-weight: 600;
    border: 2px solid #fc8181;
    box-shadow: 0 4px 12px rgba(229, 62, 62, 0.2);
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

hr {
    border: none;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(102,126,234,0.3), transparent);
    margin: 32px 0;
    border-radius: 1px;
}

ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
ul li {
    margin: 10px 0;
    font-size: 1.08rem;
}

/* --- FILE LIST --- */
.file-grid {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin: 32px 0 24px 0;
    text-align: left;
}

@media (max-width: 600px) {
    .file-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
}

.file-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 8px;
    text-decoration: none;
    color: #ffffff;
    transition: all 0.2s ease;
    backdrop-filter: blur(8px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    min-height: 48px;
    position: relative;
    overflow: hidden;
}
.file-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102,126,234,0.1) 0%, rgba(118,75,162,0.1) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}
.file-item:hover {
    transform: translateX(4px);
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(102, 126, 234, 0.3);
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.15);
}

.file-item:hover::before {
    opacity: 1;
}

.file-icon {
    display: none;
}

.file-item:hover .file-icon {
    transform: scale(1.1) rotate(5deg);
}

.file-label {
    font-size: 1rem;
    font-weight: 400;
    letter-spacing: 0.2px;
    flex: 1;
    word-break: break-word;
    padding-left: 4px;
    position: relative;
    z-index: 1;
    line-height: 1.4;
}

/* --- USER LIST --- */
.user-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin: 16px 0 24px 0;
}

.user-item {
    display: flex;
    align-items: center;
    background: rgba(255,255,255,0.9);
    border-radius: 14px;
    padding: 16px 20px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    border: 1px solid rgba(255,255,255,0.3);
    font-size: 1.1rem;
    font-weight: 500;
    color: #4a5568;
    transition: all 0.3s ease;
}

.user-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.12);
    background: rgba(255,255,255,1);
}
.folder-item .file-icon {
    color: #f6ad55;
    filter: drop-shadow(0 2px 4px rgba(246,173,85,0.3));
}
.file-file .file-icon {
    color: #4299e1;
    filter: drop-shadow(0 2px 4px rgba(66,153,225,0.3));
}
.back-link {
    display: inline-block;
    margin-bottom: 16px;
    color: #667eea;
    background: rgba(255,255,255,0.9);
    border-radius: 10px;
    padding: 12px 20px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102,126,234,0.1);
    border: 1px solid rgba(102,126,234,0.2);
    backdrop-filter: blur(5px);
}
.back-link:hover {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    box-shadow: 0 8px 25px rgba(102,126,234,0.3);
    transform: translateY(-2px);
}
@media (max-width: 768px) {
    .center-box {
        width: calc(100vw - 32px);
        max-width: none;
        min-width: 300px;
        margin: 16px;
        padding: 32px 24px 28px 24px;
    }
    
    .center-box h2 {
        font-size: 2.2rem;
    }
    
    .center-box a {
        margin: 6px 4px;
        padding: 12px 20px;
        font-size: 0.95rem;
    }
    
    .file-grid {
         margin: 20px 0 16px 0;
         gap: 6px;
     }
     
     .file-item {
         padding: 10px 14px;
         min-height: 44px;
         border-radius: 6px;
     }
     
     .file-label {
         font-size: 0.95rem;
         padding-left: 2px;
     }
    
    .ip-box {
        top: 12px;
        left: 12px;
        padding: 8px 16px;
        font-size: 0.95rem;
    }
}

@media (max-width: 480px) {
    .center-box {
        width: calc(100vw - 24px);
        margin: 12px;
        padding: 28px 20px 24px 20px;
        min-width: 280px;
    }
    
    .center-box h2 {
        font-size: 1.9rem;
        margin-bottom: 20px;
    }
    
    .center-box h3 {
        font-size: 1.3rem;
        margin: 24px 0 12px 0;
    }
    
    .center-box a {
        margin: 4px 2px;
        padding: 10px 16px;
        font-size: 0.9rem;
        border-radius: 12px;
    }
    
    .login-form input, .add-user-form input, .add-user-form select {
        padding: 14px 18px;
        font-size: 1rem;
        border-radius: 14px;
    }
    
    .login-form button, .add-user-form button {
        padding: 14px 24px;
        font-size: 1rem;
        border-radius: 14px;
        margin: 16px 0 6px 0;
    }
    
    .file-item {
         padding: 8px 12px;
         min-height: 40px;
         border-radius: 6px;
     }
     
     .file-label {
         font-size: 0.9rem;
         padding-left: 0;
     }
    
    .user-item {
        padding: 12px 16px;
        font-size: 1rem;
        border-radius: 12px;
    }
    
    .ip-box {
        top: 8px;
        left: 8px;
        padding: 6px 12px;
        font-size: 0.85rem;
        border-radius: 12px;
    }
}

/* Улучшенная прокрутка */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
}