/* ═══════════════════════════════════════════════════════════════
   USB Access Control — Stylesheet
   ═══════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=DM+Sans:wght@400;500;600;700&display=swap');

:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-card: #1a2236;
    --bg-input: #0f172a;
    --border: #1e3a5f;
    --border-focus: #3b82f6;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --success: #10b981;
    --warning: #f59e0b;
    --purple: #8b5cf6;
    --shadow: 0 4px 24px rgba(0,0,0,0.4);
    --radius: 8px;
    --radius-lg: 12px;
}

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

body {
    font-family: 'DM Sans', -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* ─── Top Navigation ───────────────────────────────────── */
.topnav {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}
.topnav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    font-size: 15px;
    color: var(--accent);
    text-decoration: none;
}
.topnav-brand .icon {
    width: 32px; height: 32px;
    background: linear-gradient(135deg, var(--accent), var(--purple));
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    font-size: 16px;
}
.topnav-links { display: flex; gap: 4px; }
.topnav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.15s;
}
.topnav-links a:hover, .topnav-links a.active {
    background: var(--bg-card);
    color: var(--text-primary);
}
.topnav-user {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    color: var(--text-secondary);
}
.topnav-user .badge {
    background: var(--accent);
    color: #fff;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}

/* ─── Buttons ──────────────────────────────────────────── */
.btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 600;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.15s;
    font-family: inherit;
    text-decoration: none;
    white-space: nowrap;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: var(--danger-hover); }
.btn-success { background: var(--success); color: #fff; }
.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}
.btn-ghost:hover { background: var(--bg-card); color: var(--text-primary); }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-lg { padding: 12px 24px; font-size: 14px; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ─── Cards ────────────────────────────────────────────── */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    margin-bottom: 16px;
}
.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}
.card-title {
    font-size: 15px;
    font-weight: 700;
}

/* ─── Forms ────────────────────────────────────────────── */
.form-group { margin-bottom: 16px; }
.form-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.form-input, .form-select {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.15s;
}
.form-input:focus, .form-select:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}
.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 32px;
}

/* ─── Tables ───────────────────────────────────────────── */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th {
    text-align: left;
    padding: 10px 12px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}
td {
    padding: 10px 12px;
    border-bottom: 1px solid rgba(30, 58, 95, 0.3);
    color: var(--text-secondary);
}
tr:hover td { background: rgba(59, 130, 246, 0.04); }

/* ─── Status Badges ────────────────────────────────────── */
.status {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
}
.status-blocked { background: rgba(239,68,68,0.15); color: var(--danger); }
.status-readonly { background: rgba(59,130,246,0.15); color: var(--accent); }
.status-active { background: rgba(16,185,129,0.15); color: var(--success); }
.status-inactive { background: rgba(100,116,139,0.15); color: var(--text-muted); }
.status-dot {
    width: 6px; height: 6px; border-radius: 50%;
    display: inline-block;
}
.status-dot.green { background: var(--success); }
.status-dot.red { background: var(--danger); }
.status-dot.yellow { background: var(--warning); }

/* ─── Layout ───────────────────────────────────────────── */
.page-content { padding: 24px; max-width: 1280px; margin: 0 auto; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .topnav { flex-wrap: wrap; height: auto; padding: 12px; gap: 8px; }
}

/* ─── Stat Cards ───────────────────────────────────────── */
.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 16px 20px;
}
.stat-label { font-size: 12px; color: var(--text-muted); font-weight: 500; }
.stat-value {
    font-size: 28px;
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
    margin-top: 4px;
}

/* ─── Device Card ──────────────────────────────────────── */
.device-card {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: border-color 0.15s;
}
.device-card:hover { border-color: var(--accent); }
.device-icon {
    width: 44px; height: 44px;
    background: rgba(59,130,246,0.1);
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}

/* ─── File Browser ─────────────────────────────────────── */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 13px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}
.breadcrumb a {
    color: var(--accent);
    text-decoration: none;
    padding: 2px 6px;
    border-radius: 4px;
}
.breadcrumb a:hover { background: rgba(59,130,246,0.1); }
.breadcrumb .sep { color: var(--text-muted); }

.file-entry {
    display: flex;
    align-items: center;
    padding: 10px 14px;
    border-bottom: 1px solid rgba(30,58,95,0.2);
    cursor: pointer;
    transition: background 0.1s;
    gap: 12px;
}
.file-entry:hover { background: rgba(59,130,246,0.04); }
.file-icon {
    width: 36px; height: 36px;
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}
.file-icon.dir { background: rgba(59,130,246,0.1); }
.file-icon.file { background: rgba(100,116,139,0.1); }
.file-name { flex: 1; font-size: 14px; font-weight: 500; color: var(--text-primary); }
.file-meta {
    font-size: 12px;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    text-align: right;
}
.file-preview {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 0 0 var(--radius) var(--radius);
    padding: 16px;
    max-height: 500px;
    overflow: auto;
    border-top: none;
}
.file-preview pre {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: var(--text-secondary);
}
.file-preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius) var(--radius) 0 0;
    font-size: 13px;
    font-weight: 600;
}

/* ─── Modal ────────────────────────────────────────────── */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}
.modal-overlay.active { display: flex; }
.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    width: 90%;
    max-width: 480px;
    box-shadow: var(--shadow);
}
.modal-title { font-size: 18px; font-weight: 700; margin-bottom: 16px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 20px; }

/* ─── Toast Notifications ──────────────────────────────── */
.toast-container {
    position: fixed;
    top: 72px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.toast {
    padding: 12px 20px;
    border-radius: var(--radius);
    font-size: 13px;
    font-weight: 500;
    box-shadow: var(--shadow);
    animation: slideIn 0.3s ease;
    max-width: 360px;
}
.toast-success { background: var(--success); color: #fff; }
.toast-error { background: var(--danger); color: #fff; }
.toast-info { background: var(--accent); color: #fff; }
@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* ─── Utilities ────────────────────────────────────────── */
.mono { font-family: 'JetBrains Mono', monospace; }
.text-muted { color: var(--text-muted); }
.text-sm { font-size: 12px; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }

.empty-state {
    text-align: center;
    padding: 48px 20px;
    color: var(--text-muted);
}
.empty-state .icon { font-size: 48px; margin-bottom: 12px; }

.readonly-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: rgba(239,68,68,0.1);
    border: 1px solid rgba(239,68,68,0.2);
    color: var(--danger);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 700;
}

.security-notice {
    background: rgba(59,130,246,0.06);
    border: 1px solid rgba(59,130,246,0.15);
    border-radius: var(--radius);
    padding: 12px 14px;
    margin-bottom: 20px;
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
}
.security-notice strong { color: var(--accent); }