/* login: settings-sheet skeleton — left rail + stacked device rows */
:root {
    --bar: #45275A;
    --mark: #AED581;
    --wash: #F3EEF7;
    --ink: #311B3E;
    --ok: #33691E;
    --paper: #fbf8fd;
    --line: #d8cce0;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: auto;
}

body {
    margin: 0;
    color: var(--ink);
    background: var(--wash);
    font-family: "Segoe UI", "Noto Sans SC", "PingFang SC", sans-serif;
    line-height: 1.75;
}

a {
    color: inherit;
}

.mast {
    background: var(--bar);
    color: #fff;
}

.mast-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px 28px;
}

.brand {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
}

.nav a {
    color: #efe6f4;
    text-decoration: none;
    font-size: 14px;
    border-bottom: 1px solid transparent;
}

.nav a:hover,
.nav a:focus {
    border-bottom-color: var(--mark);
}

.app {
    max-width: 1180px;
    margin: 0 auto;
    padding: 28px 20px 48px;
    display: flex;
    align-items: flex-start;
    gap: 28px;
}

.rail {
    width: 200px;
    flex-shrink: 0;
    position: sticky;
    top: 16px;
    background: #fff;
    border: 1px solid var(--line);
    padding: 16px 14px;
}

.rail-kicker {
    margin: 0 0 10px;
    font-size: 12px;
    letter-spacing: 0.12em;
    color: var(--bar);
}

.rail-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.rail-list li {
    border-top: 1px solid var(--wash);
}

.rail-list a {
    display: block;
    padding: 8px 4px;
    text-decoration: none;
    font-size: 13px;
}

.rail-list a:hover,
.rail-list a:focus {
    background: var(--wash);
}

.pane {
    flex: 1;
    min-width: 0;
    background: var(--paper);
    border: 1px solid var(--line);
    padding: 8px 0 32px;
}

.hero,
.block {
    padding: 28px 32px 8px;
}

.eyebrow {
    margin: 0 0 8px;
    font-size: 12px;
    letter-spacing: 0.16em;
    color: var(--ok);
}

.hero h1,
.block h2 {
    margin: 0 0 14px;
    line-height: 1.4;
    color: var(--bar);
}

.hero p,
.block p,
.qa p,
.device-desc,
.field p,
.track p,
.split-card p,
.pace p {
    margin: 0 0 14px;
}

.stamp {
    font-size: 13px;
    color: #6b5774;
}

.devices {
    list-style: none;
    margin: 20px 0 8px;
    padding: 0;
    border: 1px solid var(--line);
    background: #fff;
}

.device {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--wash);
}

.device:last-child {
    border-bottom: 0;
}

.device-ico {
    flex-shrink: 0;
}

.device-body {
    flex: 1;
    min-width: 0;
}

.device-name {
    margin: 0 0 4px;
    font-weight: 700;
}

.device-desc {
    margin: 0;
    font-size: 14px;
    color: #5a4763;
}

.device-state {
    margin: 0;
    flex-shrink: 0;
    font-size: 12px;
    color: var(--ok);
    background: #eef6e4;
    padding: 4px 8px;
    white-space: nowrap;
}

.lead-plain {
    margin-bottom: 18px;
}

.plain-title {
    margin: 0 0 12px;
    font-size: 18px;
    color: var(--bar);
}

.fields {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.field {
    background: #fff;
    border-left: 4px solid var(--mark);
    padding: 14px 16px 4px;
}

.field h3,
.track h3,
.split-card h3,
.pace h3,
.qa h3 {
    margin: 8px 0 8px;
    font-size: 17px;
}

.track {
    list-style: none;
    margin: 18px 0 0;
    padding: 0 0 0 22px;
    border-left: 3px solid var(--mark);
}

.track-alt {
    border-left-color: var(--bar);
}

.track li {
    position: relative;
    padding: 0 0 18px 18px;
}

.track li::before {
    content: counter(step);
    counter-increment: step;
    position: absolute;
    left: -34px;
    top: 0;
    width: 22px;
    height: 22px;
    background: var(--bar);
    color: #fff;
    font-size: 12px;
    line-height: 22px;
    text-align: center;
}

.track {
    counter-reset: step;
}

.split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 8px;
}

.split-card {
    background: #fff;
    padding: 16px 18px 8px;
    border-top: 4px solid var(--ok);
}

.split-card-warn {
    border-top-color: var(--bar);
    background: #f7f1fa;
}

.paces {
    list-style: none;
    margin: 12px 0 0;
    padding: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.pace {
    background: #fff;
    padding: 14px 16px 4px;
    border: 1px dashed var(--bar);
}

.faq {
    padding-bottom: 20px;
}

.qa {
    background: #fff;
    padding: 14px 16px 6px;
    margin-bottom: 12px;
    border-bottom: 2px solid var(--wash);
}

.foot {
    background: var(--ink);
    color: #e8ddef;
    padding: 28px 20px 36px;
    text-align: center;
}

.foot p {
    margin: 0 0 8px;
    font-size: 14px;
}

@media (max-width: 880px) {
    .app {
        flex-direction: column;
    }

    .rail {
        position: static;
        width: 100%;
    }

    .fields,
    .split,
    .paces {
        grid-template-columns: 1fr;
    }

    .device {
        flex-wrap: wrap;
    }
}