:root {
    --bg: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text: #f8fafc;
    --muted: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: rgba(255, 255, 255, 0.1);
    --glass: blur(12px);
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Segoe UI', system-ui, sans-serif; }

body {
    background-color: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-image: radial-gradient(circle at top left, #1e293b 0%, transparent 40%);
}

/* Container Glassmorphism */
.container {
    width: 100%;
    max-width: 900px;
    background: var(--card-bg);
    backdrop-filter: var(--glass);
    -webkit-backdrop-filter: var(--glass);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    margin: 20px;
    animation: fadeUp 0.6s ease-out;
}

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

/* Header & Nav */
header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2rem; border-bottom: 1px solid var(--border); padding-bottom: 1rem; }
h1 { font-size: 1.5rem; font-weight: 700; color: white; display: flex; align-items: center; gap: 10px; }
.nav-links a { color: var(--muted); text-decoration: none; margin-left: 20px; font-size: 0.9rem; transition: 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--accent); }

/* Forms */
.form-group { margin-bottom: 1.5rem; }
label { display: block; margin-bottom: 0.5rem; color: var(--muted); font-size: 0.9rem; }
input {
    width: 100%; padding: 12px; background: rgba(0,0,0,0.2); border: 1px solid var(--border);
    border-radius: 8px; color: white; transition: 0.3s; outline: none;
}
input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2); }

button {
    width: 100%; padding: 12px; background: var(--accent); color: white; border: none;
    border-radius: 8px; font-weight: 600; cursor: pointer; transition: 0.2s;
}
button:hover { background: var(--accent-hover); transform: translateY(-1px); }

/* Table */
table { width: 100%; border-collapse: collapse; }
th { text-align: left; color: var(--muted); padding: 1rem; border-bottom: 1px solid var(--border); font-weight: 600; font-size: 0.85rem; text-transform: uppercase; }
td { padding: 1rem; border-bottom: 1px solid var(--border); vertical-align: middle; }
tr:last-child td { border-bottom: none; }
tr:hover { background: rgba(255,255,255,0.02); }

.file-row { display: flex; align-items: center; gap: 12px; font-weight: 500; }
.actions { display: flex; gap: 8px; justify-content: flex-end; }
.btn-sm { padding: 6px 12px; font-size: 0.8rem; width: auto; background: transparent; border: 1px solid var(--border); }
.btn-sm:hover { background: rgba(255,255,255,0.05); }

/* Utilities */
.alert { padding: 12px; border-radius: 8px; margin-bottom: 1rem; font-size: 0.9rem; text-align: center; }
.alert-error { background: rgba(239, 68, 68, 0.15); color: #fca5a5; border: 1px solid rgba(239, 68, 68, 0.2); }
.alert-success { background: rgba(34, 197, 94, 0.15); color: #86efac; border: 1px solid rgba(34, 197, 94, 0.2); }

/* Toast */
.toast {
    position: fixed; bottom: 20px; right: 20px; background: var(--accent); color: white;
    padding: 12px 24px; border-radius: 8px; transform: translateY(100px); opacity: 0; transition: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.toast.show { transform: translateY(0); opacity: 1; }