:root {
    --bg: #e9eaec;
    --surface: #f6f7f8;
    --text: #1c1c1c;
    --text-muted: #6b6b6b;
    --border: #d8dade;
    --accent: #4a90d9;
    --danger: #d9534f;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    padding: 20px;
}

.auth-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px 26px;
    width: 360px;
    max-width: 100%;
}
.auth-card.wide { width: 480px; }
.auth-card.settings-wide { width: 640px; }

.auth-card h1 { margin: 0 0 18px; font-size: 20px; }
.auth-card h2 { font-size: 16px; margin: 0 0 10px; }

form { display: flex; flex-direction: column; gap: 6px; margin-bottom: 6px; }
label { font-size: 13px; color: var(--text-muted); margin-top: 8px; }
input[type="text"],
input[type="password"],
input[type="email"] {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 12px;
    color: var(--text);
    font-size: 15px;
}
button {
    margin-top: 14px;
    background: var(--accent);
    color: #ffffff;
    border: none;
    border-radius: 6px;
    padding: 10px 14px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
}
button.danger-btn { background: var(--danger); color: white; }

.auth-error {
    background: #fdecea;
    color: #b3261e;
    border: 1px solid #f3c6c2;
    border-radius: 6px;
    padding: 10px 12px;
    font-size: 14px;
    margin-bottom: 14px;
}
.auth-success {
    background: #e8f5e9;
    color: #2e7d32;
    border: 1px solid #c5e6c8;
    border-radius: 6px;
    padding: 10px 12px;
    font-size: 14px;
    margin-bottom: 14px;
}
.auth-note { font-size: 13px; color: var(--text-muted); margin-top: 14px; }
.auth-link { font-size: 13px; margin-top: 16px; }
.auth-link a, .auth-note a { color: var(--accent); }

.settings-top { display: flex; align-items: center; justify-content: space-between; }

.btn-secondary {
    display: inline-block;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 6px;
    padding: 8px 14px;
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
}
.btn-secondary:hover { background: var(--bg); }
.btn-logout { color: var(--danger); border-color: #f3c6c2; }

.settings-layout {
    display: flex;
    gap: 24px;
    margin-top: 18px;
}
.settings-nav {
    width: 190px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.settings-nav-item {
    display: flex;
    align-items: center;
    gap: 8px;
    background: none;
    border: none;
    text-align: left;
    padding: 10px 12px;
    font-size: 14px;
    color: var(--text-muted);
    border-radius: 8px;
    cursor: pointer;
}
.settings-nav-item .nav-icon { flex-shrink: 0; }
.settings-nav-item .nav-label { flex: 1; }
.settings-nav-item:hover { background: var(--bg); }
.settings-nav-item.active {
    background: var(--bg);
    color: var(--text);
    font-weight: 600;
    border-left: 3px solid var(--accent);
}
.settings-content { flex: 1; min-width: 0; }
.settings-panel { display: none; }
.settings-panel.active { display: block; }

@media (max-width: 640px) {
    .auth-card.settings-wide { width: 100%; }
    .settings-layout { flex-direction: column; gap: 6px; }
    .settings-nav {
        width: 100%;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 6px;
        margin-bottom: 10px;
    }
    .settings-nav-item {
        flex: 1 1 auto;
        justify-content: center;
        border-left: none;
        border-bottom: 3px solid transparent;
        border-radius: 8px 8px 0 0;
    }
    .settings-nav-item.active { border-left: none; border-bottom-color: var(--accent); }
}
.settings-section {
    border-top: 1px solid var(--border);
    padding-top: 16px;
    margin-top: 16px;
}
#qrcode { margin: 10px 0; }
.secret-key {
    font-family: monospace;
    font-size: 15px;
    letter-spacing: 1px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 8px 10px;
    display: inline-block;
}
.checkbox-row {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text);
    margin-top: 12px;
    cursor: pointer;
}
.checkbox-row input { width: auto; margin: 0; }
.device-list { list-style: none; padding: 0; margin: 0 0 14px; }
.device-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    flex-wrap: wrap;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
}
.device-info { display: flex; flex-direction: column; gap: 2px; font-size: 13px; color: var(--text-muted); }
.device-info strong { color: var(--text); font-size: 14px; }
.device-actions { display: flex; gap: 8px; flex-shrink: 0; }
.text-btn-inline {
    background: none;
    border: 1px solid var(--border);
    color: var(--danger);
    border-radius: 6px;
    padding: 6px 10px;
    font-size: 13px;
    font-weight: 400;
    margin: 0;
    cursor: pointer;
    white-space: nowrap;
}
.text-btn-inline.renew-btn { color: var(--accent); }