:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --bg-gradient: linear-gradient(135deg, #f6f8fd 0%, #f1f5f9 100%);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.1);
    --text-main: #1e293b;
    --text-muted: #64748b;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: var(--bg-gradient);
    min-height: 100vh;
    margin: 0;
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    box-sizing: border-box;
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: var(--glass-shadow);
    padding: 2.5rem;
    width: 100%;
    max-width: 800px;
    transition: all 0.3s ease;
}

h1, h2, h3 {
    margin-top: 0;
    color: var(--primary);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
}

input, select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.9);
    font-size: 1rem;
    box-sizing: border-box;
    transition: border-color 0.2s;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

button {
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    width: 100%;
}

button:hover {
    background: var(--primary-hover);
}

button:active {
    transform: scale(0.98);
}

.hidden {
    display: none !important;
}

.btn-secondary {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
}
.btn-secondary:hover {
    background: rgba(79, 70, 229, 0.05);
}

.file-list {
    margin-top: 2rem;
}

.file-item, .user-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: rgba(255,255,255,0.6);
    border-radius: 12px;
    margin-bottom: 0.75rem;
    border: 1px solid #e2e8f0;
    transition: transform 0.2s;
}

.file-item:hover, .user-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.file-info {
    display: flex;
    flex-direction: column;
}

.file-name {
    font-weight: 600;
}

.file-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.file-actions button, .user-actions button {
    width: auto;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    margin-left: 0.5rem;
}

.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: #10b981;
    color: white;
    padding: 1rem 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
    z-index: 1000;
}

.toast.show {
    opacity: 1;
}

.toast.error {
    background: #ef4444;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--glass-border);
}

nav button {
    width: auto;
}