:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: #1a2035;
    --bg-card-hover: #1f2847;
    --border: #2a3555;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.3);
    --green: #22c55e;
    --green-glow: rgba(34, 197, 94, 0.3);
    --red: #ef4444;
    --orange: #f59e0b;
    --purple: #a855f7;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* ── Login Screen ── */
.login-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    background-image:
        radial-gradient(ellipse at 20% 50%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(168, 85, 247, 0.06) 0%, transparent 50%);
    z-index: 1000;
}

.login-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 48px 40px;
    width: 100%;
    max-width: 420px;
    box-shadow:
        0 25px 60px rgba(0, 0, 0, 0.5),
        0 0 40px rgba(59, 130, 246, 0.05);
    animation: loginSlideIn 0.5s ease-out;
}

@keyframes loginSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.97);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.login-logo {
    font-size: 32px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent), var(--purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
    margin-bottom: 4px;
}

.login-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 32px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.login-warning {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: 10px;
    padding: 12px 16px;
    font-size: 12px;
    color: var(--orange);
    margin-bottom: 24px;
    text-align: center;
    line-height: 1.5;
}

.login-field {
    margin-bottom: 20px;
}

.login-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
    letter-spacing: 0.3px;
}

.login-input {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 14px;
    outline: none;
    transition: all 0.2s ease;
}

.login-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.login-input::placeholder {
    color: var(--text-muted);
}

.login-error {
    color: var(--red);
    font-size: 13px;
    min-height: 20px;
    margin-bottom: 8px;
    text-align: center;
}

.login-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--accent), #2563eb);
    border: none;
    border-radius: 10px;
    color: white;
    font-family: var(--font);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    letter-spacing: 0.3px;
}

.login-btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.35);
}

.login-btn:active:not(:disabled) {
    transform: translateY(0);
}

.login-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ── App Layout ── */
.app {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px;
}

/* ── Header ── */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 32px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo {
    font-size: 28px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent), var(--purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: var(--bg-card);
    color: var(--text-muted);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}

.badge.online {
    background: var(--green-glow);
    color: var(--green);
    border-color: var(--green);
    box-shadow: 0 0 12px var(--green-glow);
}

.badge.offline {
    background: rgba(239, 68, 68, 0.15);
    color: var(--red);
    border-color: var(--red);
}

.uptime {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
}

.logout-btn {
    padding: 6px 16px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.logout-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--red);
    color: var(--red);
}

/* ── Stats Grid ── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s ease;
}

.stat-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    transform: translateY(-2px);
}

.stat-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
}

/* ── Section ── */
.section {
    margin-bottom: 32px;
}

.section-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

/* ── Client install ── */
.install-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 8px 0;
    overflow: hidden;
}

.install-step {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
}

.install-step:last-child {
    border-bottom: none;
}

.install-step-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

.install-step-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
}

.copy-btn {
    padding: 4px 12px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
}

.copy-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.install-code {
    margin: 0;
    padding: 12px 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--green);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 13px;
    line-height: 1.5;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-all;
}

/* ── Table ── */
.table-container {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th {
    text-align: left;
    padding: 14px 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

.table td {
    padding: 14px 20px;
    font-size: 14px;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}

.table tr:last-child td {
    border-bottom: none;
}

.table tr:hover td {
    background: var(--bg-card-hover);
}

.table td.empty {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
    font-style: italic;
}

.client-id {
    font-weight: 600;
    color: var(--accent);
}

/* ── Footer ── */
.footer {
    text-align: center;
    padding: 20px;
    color: var(--text-muted);
    font-size: 12px;
    border-top: 1px solid var(--border);
}

/* ── Animations ── */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.stat-card, .section {
    animation: fadeIn 0.4s ease forwards;
}

.stat-card:nth-child(2) { animation-delay: 0.05s; }
.stat-card:nth-child(3) { animation-delay: 0.1s; }
.stat-card:nth-child(4) { animation-delay: 0.15s; }
.stat-card:nth-child(5) { animation-delay: 0.2s; }
.stat-card:nth-child(6) { animation-delay: 0.25s; }

/* ── Responsive ── */
@media (max-width: 768px) {
    .app { padding: 16px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .header { flex-direction: column; gap: 12px; text-align: center; }
    .header-left { flex-direction: column; }
    .header-right { flex-direction: column; }
    .table-container { overflow-x: auto; }
    .login-card { margin: 16px; padding: 32px 24px; }
}