:root {
    --bg: #f8fafc;
    --card: #ffffff;
    --card2: #f9fafb;
    --text: #1e293b;
    --muted: #64748b;
    --line: #e2e8f0;
    --primary: #0489e4;
    --primary2: #062c78;
    --danger: #ef4444;
    --warn: #f59e0b;
    --good: #53ac1a;
    --accent1: #0bb3fc;
    --accent2: #cbd4da;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 8px;
    --radius2: 12px;
    --radius-full: 9999px;

    --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

[data-theme="dark"] {
    --bg: #0f172a;
    --card: #1e293b;
    --card2: #334155;
    --text: #f1f5f9;
    --muted: #94a3b8;
    --line: #475569;
    --primary: #0bb3fc;
    --primary2: #0489e4;
    --danger: #f87171;
    --warn: #fbbf24;
    --good: #53ac1a;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -1px rgba(0, 0, 0, 0.1);
}

/* Dark mode specific styling for details sections */
[data-theme="dark"] .details {
    border: 1px solid var(--line);
    background: color-mix(in srgb, var(--card2) 95%, var(--bg));
}

[data-theme="dark"] .details summary {
    background: color-mix(in srgb, var(--card2) 90%, var(--primary));
    border-bottom: 1px solid var(--line);
}

[data-theme="dark"] .details[open] summary {
    border-bottom: 1px solid var(--line);
}

[data-theme="dark"] .details>div {
    background: var(--card2);
    border-radius: var(--radius);
    padding: 0.75rem;
    margin-top: 0.5rem;
    border: 1px solid var(--line);
    border-top: none;
}

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

.skip-link {
    position: absolute;
    left: -999px;
    top: 8px;
    padding: 10px 12px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 10px;
    color: var(--text);
    z-index: 20;
}

.skip-link:focus {
    left: 8px;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 50px;
    border-bottom: 1px solid var(--line);
    background: var(--card);
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.brand {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.logo {
    width: 10.5rem;
    height: 3.5rem;
    border-radius: var(--radius);
    display: grid;
    place-items: center;
    font-weight: 700;
    color: white;
    overflow: hidden;
    background: transparent;
    border: none;
}

.web-logo img,
.mobile-logo img {
    width: 100%;
    height: 100%;
    border-radius: var(--radius);
    object-fit: cover;
}

.web-logo {
    display: block;
}

.mobile-logo {
    display: none;
}

.brand-title {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text);
}

.brand-sub {
    color: var(--muted);
    font-size: 0.75rem;
    margin-top: 0.25rem;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.topbar-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.menu-icon {
    width: 1.5rem;
    height: 1.5rem;
}

.mobile-menu-btn {
    display: none;
    padding: 0.5rem;
}

.mobile-menu {
    position: absolute;
    top: 100%;
    right: 1.5rem;
    width: 240px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    z-index: 20;
    padding: 0.75rem 0;
}

.mobile-menu-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 0.25rem 0;
}

.mobile-menu .btn {
    width: 100%;
    justify-content: flex-start;
    border: none;
    border-radius: 0;
    padding: 0.75rem 1rem;
    margin: 0;
}

.mobile-menu .btn:hover {
    background: var(--card2);
}

.mobile-menu .toggle {
    padding: 0.75rem 1rem;
    margin: 0;
    border: none;
    border-radius: 0;
    background: var(--card2);
    justify-content: space-between;
}

.mobile-menu .toggle:hover {
    background: color-mix(in srgb, var(--card2) 90%, var(--primary));
}

.mobile-menu .toggle-label {
    margin: 0;
}

@media (max-width: 768px) {

    #btnGuide,
    #themeToggle {
        display: none;
    }

    #btnGuideMobile,
    #themeToggleMobile {
        display: flex;
    }
}

.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1.5rem 4rem;
    width: 95%;
}

.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius2);
    box-shadow: var(--shadow);
    overflow: hidden;
    margin: 1.5rem 0;
}

.tabs {
    display: flex;
    gap: 0.25rem;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--line);
    background: var(--card2);
}

.tab {
    border: 1px solid var(--line);
    background: transparent;
    color: var(--muted);
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.tabs-spacer {
    flex: 1;
}

.panel {
    padding: 1.5rem;
    margin: 0 0.5rem;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

@media (max-width: 900px) {
    .grid-2 {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {
    .topbar {
        padding: 0.75rem 1rem;
    }

    .brand-title {
        font-size: 1.1rem;
    }

    .logo {
        width: 2rem;
        height: 2rem;
        font-size: 1rem;
    }

    .web-logo {
        display: none;
    }

    .mobile-logo {
        display: block;
    }

    .topbar-right {
        gap: 0.5rem;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .topbar-actions {
        display: none;
    }

    .container {
        padding: 0 1rem 3rem;
    }

    .panel {
        padding: 1rem;
        margin: 0;
    }

    .subcard {
        padding: 1rem;
    }

    .tabs {
        padding: 0.75rem;
    }

    .footer {
        padding: 1rem;
    }

    #selfTestSection {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .topbar {
        padding: 10px 15px;
    }

    .brand {
        gap: 0.5rem;
    }

    .logo {
        width: 134px;
        height: 43px;
        font-size: 0.875rem;
    }

    .logo img {
        width: 100%;
        height: 100%;
        object-fit: cover;
    }

    .web-logo {
        display: none;
    }

    .mobile-logo {
        display: block;
    }

    .brand-title {
        font-size: 1rem;
    }

    .topbar-right {
        gap: 0.25rem;
    }

    .btn {
        padding: 0.4rem 0.75rem;
        font-size: 0.875rem;
    }

    .btn-danger {
        padding: 0.4rem 0.6rem;
        font-size: 0.875rem;
    }

    .container {
        padding: 0 0.5rem 2rem;
    }

    .panel {
        padding: 0.75rem;
    }

    .subcard {
        padding: 0.75rem;
    }

    .tabs {
        padding: 0.5rem;
    }

    .hint {
        font-size: 0.7rem;
    }

    .label {
        font-size: 0.7rem;
    }

    .input,
    .textarea,
    select {
        padding: 0.5rem;
        font-size: 0.875rem;
    }

    .textarea {
        min-height: 6rem;
    }
}

.subcard {
    background: var(--card2);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: box-shadow 0.2s ease;
    margin-bottom: 1.5rem;
}

.subcard:hover {
    box-shadow: var(--shadow);
}

h2 {
    margin: 0 0 1rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
}

h3 {
    margin: 1rem 0 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text);
}

.stack {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.row {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.row.wrap {
    flex-wrap: wrap;
}

.row.justify-between {
    justify-content: space-between;
}

.row.justify-center {
    justify-content: center;
}

.row.justify-end {
    justify-content: flex-end;
}

.label {
    font-weight: 600;
    font-size: 0.75rem;
    color: var(--muted);
    margin-bottom: 0.25rem;
    display: block;
}

.input,
.textarea,
select {
    width: 100%;
    background: var(--card);
    color: var(--text);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 0.75rem;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.input:focus,
.textarea:focus,
select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 20%, transparent);
}

.textarea {
    resize: vertical;
    min-height: 8rem;
    margin: 0.5rem 0;
}

.mono {
    font-family: var(--mono);
}

.btn {
    border: 1px solid var(--line);
    background: var(--card);
    color: var(--text);
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn:hover {
    background: color-mix(in srgb, var(--card) 85%, var(--primary));
    border-color: color-mix(in srgb, var(--primary) 50%, var(--line));
}

.btn:active {
    transform: translateY(1px);
}

.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary2);
    border-color: var(--primary2);
}

.btn-ghost {
    background: transparent;
    border-color: transparent;
}

.btn-ghost:hover {
    background: var(--card2);
    border-color: var(--line);
}

.btn-danger {
    background: var(--danger);
    border-color: var(--danger);
    color: white;
}

.btn-danger:hover {
    background: color-mix(in srgb, var(--danger) 80%, black);
    border-color: color-mix(in srgb, var(--danger) 80%, black);
}

.hint {
    color: var(--muted);
    font-size: 0.75rem;
    line-height: 1.5;
    margin-top: 0.25rem;
}

.status {
    min-height: 1.5rem;
    color: var(--muted);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

.hidden {
    display: none !important;
}

.segmented {
    display: flex;
    gap: 0.25rem;
    background: transparent;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 0.25rem;
}

.seg {
    flex: 0 0 auto;
    border: none;
    border-radius: calc(var(--radius) - 2px);
    padding: 0.5rem 1rem;
    cursor: pointer;
    background: transparent;
    color: var(--muted);
    font-weight: 500;
    transition: all 0.2s ease;
}

.seg.active {
    background: var(--primary);
    color: white;
}

.details {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 0.75rem;
    margin: 0.75rem 0;
    background: color-mix(in srgb, var(--card) 80%, var(--card2));
}

.details summary {
    cursor: pointer;
    font-weight: 600;
    list-style: none;
    padding: 0.5rem;
    margin: -0.75rem;
    background: color-mix(in srgb, var(--card2) 90%, var(--card));
    border-radius: calc(var(--radius) - 2px);
    border-bottom: 1px solid var(--line);
}

.details summary::-webkit-details-marker {
    display: none;
}

.details[open] summary {
    border-bottom: 1px solid var(--line);
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
    margin-bottom: 0.75rem;
}

.check {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    font-size: 0.875rem;
    color: var(--muted);
    margin: 0.5rem 0;
}

.pill {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    border: 1px solid var(--line);
    background: var(--card2);
    border-radius: var(--radius-full);
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    color: var(--muted);
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 99px;
}

.dot-green {
    background: color-mix(in srgb, var(--good) 85%, white);
}

.meter-wrap {
    margin-top: 0.5rem;
}

.meter {
    height: 0.5rem;
    border-radius: var(--radius-full);
    background: var(--card2);
    border: 1px solid var(--line);
    overflow: hidden;
}

.meter-bar {
    height: 100%;
    border-radius: var(--radius-full);
    background: linear-gradient(90deg, var(--danger), var(--warn), var(--good));
    width: 0%;
    transition: width 0.3s ease;
}

.warnlist {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.warn {
    font-size: 0.75rem;
    color: var(--warn);
    padding: 0.25rem 0;
}

.progress {
    width: 100%;
    height: 0.5rem;
    border-radius: var(--radius-full);
    background: var(--card2);
    border: 1px solid var(--line);
    overflow: hidden;
    margin: 0.5rem 0;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: var(--primary);
    transition: width 0.3s ease;
}

.footer {
    padding: 1.5rem;
    border-top: 1px solid var(--line);
    background: var(--card2);
    margin-top: 2rem;
    border-radius: 0 0 var(--radius2) var(--radius2);
    margin-bottom: 1rem;
}

.log {
    background: var(--card2);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 0.75rem;
    color: var(--muted);
    font-family: var(--mono);
    font-size: 0.75rem;
    overflow: auto;
    max-height: 15rem;
    margin: 0.5rem 0;
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    display: grid;
    place-items: center;
    z-index: 30;
    background: rgba(0, 0, 0, 0.5);
}

.modal-backdrop {
    position: absolute;
    inset: 0;
}

.modal-card {
    position: relative;
    width: min(820px, 92vw);
    max-height: 86vh;
    overflow: auto;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius2);
    box-shadow: var(--shadow-lg);
}

.modal-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 1rem;
    border-bottom: 1px solid var(--line);
}

.modal-body {
    padding: 1rem;
}

.kbd {
    font-family: var(--mono);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 0.125rem 0.5rem;
    color: var(--text);
    background: var(--card2);
    font-size: 0.875em;
}

/* Toggle */
.toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border: 1px solid var(--line);
    padding: 0.25rem;
    border-radius: var(--radius-full);
    background: var(--card2);
    position: relative;
}

.toggle-input {
    opacity: 0;
    width: 3rem;
    height: 1.5rem;
    position: absolute;
}

.toggle-label {
    font-size: 0.75rem;
    color: var(--muted);
    padding: 0.25rem 0.5rem;
    border-radius: calc(var(--radius-full) - 2px);
    cursor: pointer;
    transition: all 0.2s ease;
}

.toggle-input:checked+.toggle-label {
    background: var(--primary);
    color: white;
}

/* Self-test section */
#selfTestSection {
    margin-top: 1.5rem;
    padding: 1.5rem;
    border-top: 1px solid var(--line);
    background: var(--card2);
    border-radius: var(--radius);
}

#selfTestSection h2 {
    margin-bottom: 1rem;
}

/* Additional mobile optimizations */
@media (max-width: 768px) {
    .container {
        margin-top: 1rem;
    }

    .card {
        margin: 1rem 0;
        border-radius: var(--radius);
    }

    .tabs {
        flex-wrap: wrap;
    }

    .tab {
        padding: 0.5rem 0.75rem;
        font-size: 0.875rem;
    }

    .subcard {
        margin-bottom: 1rem;
    }

    h2 {
        font-size: 0.95rem;
    }

    h3 {
        font-size: 0.85rem;
    }

    .input,
    .textarea,
    select {
        font-size: 0.9rem;
    }

    .btn {
        padding: 0.45rem 0.8rem;
        font-size: 0.875rem;
    }

    .row.wrap {
        flex-wrap: wrap;
    }

    .pill {
        font-size: 0.7rem;
        padding: 0.2rem 0.4rem;
    }

    .hint {
        font-size: 0.75rem;
    }

    .label {
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .container {
        margin-top: 0.75rem;
    }

    .card {
        margin: 0.75rem 0;
    }

    .panel {
        padding: 0.5rem;
    }

    .subcard {
        margin-bottom: 0.75rem;
    }

    .tabs {
        padding: 0.5rem;
    }

    .tab {
        padding: 0.4rem 0.6rem;
        font-size: 0.8rem;
        margin: 0.1rem;
    }

    .segmented {
        flex-wrap: wrap;
    }

    .seg {
        padding: 0.4rem 0.6rem;
        font-size: 0.8rem;
    }

    .details summary {
        padding: 0.4rem;
        font-size: 0.85rem;
    }

    .log {
        font-size: 0.65rem;
        padding: 0.5rem;
    }
}