@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;600&display=swap');

:root {
    color-scheme: light;
    font-family: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
    background: radial-gradient(circle at top left, #eef6ff, #f8f1e4 55%, #f5f5f7 100%);
    color: #1d1d1f;
    --ink: #1d1d1f;
    --muted: #60606b;
    --accent: #1f4ed8;
    --accent-strong: #1237a5;
    --panel: rgba(255, 255, 255, 0.92);
    --stroke: #d7d7dd;
    --card: #f6f7fb;
    --ok: #16a34a;
    --warn: #d97706;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px 16px;
    position: relative;
    overflow-x: hidden;
}

.body-glow {
    position: fixed;
    inset: -20% 10% auto auto;
    width: 420px;
    height: 420px;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.25), transparent 70%);
    filter: blur(10px);
    z-index: -1;
}

.panel {
    width: min(720px, 100%);
    background: var(--panel);
    border-radius: 20px;
    padding: 28px 32px;
    box-shadow: 0 20px 50px rgba(40, 40, 60, 0.12);
    backdrop-filter: blur(6px);
    animation: panelFade 0.5s ease-out;
}

header h1 {
    margin: 0 0 6px;
    font-size: 32px;
    letter-spacing: -0.02em;
}

.subtitle {
    margin: 0 0 8px;
    color: var(--muted);
}

.lead {
    margin: 0 0 8px;
    color: #2f2f37;
    font-weight: 600;
}

.section {
    margin-top: 22px;
    display: grid;
    gap: 12px;
}

.section h2 {
    margin: 0;
    font-size: 18px;
}

label {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #6a6a74;
}

input {
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid var(--stroke);
    font-size: 14px;
}

button {
    padding: 10px 16px;
    border-radius: 10px;
    border: none;
    background: var(--accent);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
}

button.secondary {
    background: #eef0f6;
    color: var(--ink);
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

.status {
    padding: 8px 12px;
    border-radius: 10px;
    background: #f0f3ff;
    font-size: 14px;
}

.muted {
    color: #7d7d86;
    font-size: 14px;
}

.code {
    display: flex;
    gap: 12px;
    align-items: center;
}

.code strong {
    font-size: 18px;
}

.toggle {
    display: flex;
    gap: 10px;
    align-items: center;
    font-size: 14px;
}

.toggle span {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.toggle span::after {
    content: attr(data-state);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 2px 6px;
    border-radius: 999px;
    background: #eef0f6;
    color: #5a5a66;
}

.toggle.is-active span::after {
    background: #dcfce7;
    color: #166534;
}

.toggle.is-muted span::after {
    background: #fee2e2;
    color: #991b1b;
}

input[type="range"] {
    appearance: none;
    height: 6px;
    border-radius: 999px;
    background: #e2e6f0;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 0 4px rgba(31, 78, 216, 0.15);
    cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: none;
    background: var(--accent);
    box-shadow: 0 0 0 4px rgba(31, 78, 216, 0.15);
    cursor: pointer;
}

.ptt-button {
    min-height: 44px;
}

.meter {
    height: 8px;
    border-radius: 6px;
    background: #e1e4ee;
    overflow: hidden;
}

.meter-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #22c55e, #16a34a);
    transition: width 0.08s linear;
}

.list {
    margin: 0;
    padding-left: 18px;
    color: #4a4a55;
}

.help-link {
    font-size: 13px;
    color: var(--accent-strong);
    text-decoration: none;
}

.help-link:hover {
    text-decoration: underline;
}

.stepper {
    margin-top: 16px;
}

.stepper ol {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
}

.stepper li {
    padding: 10px 12px;
    border-radius: 12px;
    background: #f2f3f7;
    color: #62626c;
    font-weight: 600;
    text-align: center;
    position: relative;
    border: 1px solid transparent;
    transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.stepper li.active {
    background: #e8efff;
    border-color: rgba(31, 78, 216, 0.35);
    color: var(--accent-strong);
    transform: translateY(-2px);
}

.stepper li.complete {
    background: #eaf7ef;
    color: var(--ok);
}

.step-card {
    margin-top: 18px;
    padding: 18px 20px;
    border-radius: 16px;
    border: 1px solid #e4e6ee;
    background: #fcfcfe;
    display: grid;
    gap: 12px;
    animation: cardFade 0.4s ease-out;
}

.step-card:nth-of-type(1) {
    animation-delay: 0.05s;
}

.step-card:nth-of-type(2) {
    animation-delay: 0.12s;
}

.step-card:nth-of-type(3) {
    animation-delay: 0.18s;
}

.step-card.is-active {
    border-color: rgba(31, 78, 216, 0.35);
    box-shadow: 0 12px 24px rgba(31, 78, 216, 0.08);
}

.hint {
    margin: 0;
    color: #60606b;
    font-size: 14px;
}

.summary {
    background: var(--card);
    border-radius: 12px;
    padding: 12px 14px;
    display: grid;
    gap: 8px;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    color: #3c3c46;
}

.summary-row strong {
    font-weight: 600;
}

.health-grid {
    display: grid;
    gap: 12px;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.health-item {
    border: 1px solid #e1e4ee;
    background: #fbfbfd;
    border-radius: 14px;
    padding: 12px 14px;
    display: grid;
    gap: 8px;
}

.health-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 600;
    color: #2e2e35;
}

.health-state {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 4px 8px;
    border-radius: 999px;
    background: #eef0f6;
    color: #5a5a66;
}

.health-hint {
    margin: 0;
    font-size: 13px;
    color: #6a6a74;
}

.health-item.ok .health-state {
    background: #dcfce7;
    color: #166534;
}

.health-item.warn .health-state {
    background: #fef3c7;
    color: #92400e;
}

.health-item.error .health-state {
    background: #fee2e2;
    color: #991b1b;
}

@keyframes panelFade {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes cardFade {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 600px) {
    .panel {
        padding: 22px;
    }

    .stepper ol {
        grid-template-columns: 1fr;
    }

    .ptt-button {
        position: sticky;
        bottom: 16px;
        width: 100%;
        font-size: 16px;
        padding: 14px 18px;
        box-shadow: 0 12px 24px rgba(31, 78, 216, 0.2);
    }
}