:root {
    --bg: #f6f7f9;
    --card: #fff;
    --ink: #1c2230;
    --muted: #667085;
    --line: #e4e7ec;
    --primary: #3b5bdb;
    --success: #1f9d55;
    --danger: #d92d20;
    --warn-bg: #fef3f2;
    --ok-bg: #ecfdf3;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #11141b;
        --card: #1a1f2a;
        --ink: #e8ebf2;
        --muted: #98a2b3;
        --line: #2a3140;
        --primary: #7c93ff;
        --success: #3ccf7a;
        --danger: #ff6b5e;
        --warn-bg: #2b1a19;
        --ok-bg: #14261c;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

button, input, select, textarea { font: inherit; color: inherit; }

.top {
    position: sticky;
    top: 0;
    z-index: 20;
    background: var(--card);
    border-bottom: 1px solid var(--line);
}

.top-in {
    max-width: 1280px;
    margin: 0 auto;
    padding: 12px 16px;
    display: grid;
    gap: 8px;
}

.brand { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 16px; }
.brand h1 { margin: 0; font-size: 18px; }
.brand p { margin: 0; color: var(--muted); font-size: 13px; }

.bar { display: flex; height: 8px; background: var(--line); border-radius: 99px; overflow: hidden; }
#bar-done { background: var(--success); transition: width .3s; }
#bar-issue { background: var(--danger); transition: width .3s; }

.tools { display: flex; flex-wrap: wrap; gap: 8px; }
.tools input, .tools select, .tools button {
    padding: 6px 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--card);
}
.tools input { flex: 1 1 200px; }
button { cursor: pointer; }
button.danger { color: var(--danger); }

.layout {
    max-width: 1280px;
    margin: 0 auto;
    padding: 16px;
    display: grid;
    grid-template-columns: 250px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
}

#nav {
    position: sticky;
    top: 124px;
    max-height: calc(100vh - 140px);
    overflow: auto;
    display: grid;
    gap: 2px;
}

#nav a {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    padding: 6px 10px;
    border-radius: 8px;
    color: var(--ink);
    text-decoration: none;
    font-size: 14px;
}
#nav a:hover { background: var(--line); }
#nav a small { color: var(--muted); white-space: nowrap; }
#nav a.complete small { color: var(--success); font-weight: 600; }

.phase {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 12px;
    margin-bottom: 16px;
    scroll-margin-top: 130px;
}

.phase > header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    cursor: pointer;
    user-select: none;
}
.phase > header h2 { margin: 0; font-size: 17px; flex: 1; }
.phase > header .count { color: var(--muted); font-size: 13px; }
.phase > header .chev { transition: transform .2s; color: var(--muted); }
.phase.closed > header .chev { transform: rotate(-90deg); }
.phase.closed .body { display: none; }
.phase .desc { margin: 0; padding: 0 16px 12px; color: var(--muted); font-size: 14px; }

.sub {
    margin: 0;
    padding: 8px 16px;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--muted);
    background: var(--bg);
    border-top: 1px solid var(--line);
}

.item {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 4px 12px;
    padding: 12px 16px;
    border-top: 1px solid var(--line);
}
.item.done { background: var(--ok-bg); }
.item.issue { background: var(--warn-bg); }
.item.hidden { display: none; }

.item input[type=checkbox] { width: 20px; height: 20px; margin-top: 2px; accent-color: var(--success); cursor: pointer; }
.item .title { font-weight: 600; }
.item.done .title { text-decoration: line-through; opacity: .7; }
.item .expect { color: var(--muted); font-size: 14px; margin-top: 2px; }
.item .expect b { color: var(--ink); font-weight: 600; }
.item .meta { grid-column: 2; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 6px; }
.item .meta button {
    padding: 3px 10px;
    border: 1px solid var(--line);
    border-radius: 99px;
    background: var(--card);
    font-size: 13px;
}
.item .meta button.on { border-color: var(--danger); color: var(--danger); font-weight: 600; }
.item .meta .when { color: var(--muted); font-size: 12px; }
.item textarea {
    grid-column: 2;
    width: 100%;
    margin-top: 6px;
    padding: 8px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--card);
    resize: vertical;
    min-height: 60px;
}

dialog {
    width: min(680px, calc(100vw - 32px));
    max-height: calc(100vh - 64px);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 0;
    background: var(--card);
    color: var(--ink);
}
dialog::backdrop { background: rgba(0, 0, 0, .5); }
dialog .close {
    position: absolute;
    top: 8px;
    right: 12px;
    border: 0;
    background: none;
    font-size: 26px;
    line-height: 1;
}
#modal-body { padding: 20px 24px 24px; overflow: auto; max-height: calc(100vh - 66px); }
#modal-body h3 { margin: 0 32px 4px 0; }
#modal-body h4 { margin: 18px 0 6px; font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
#modal-body p { margin: 0; }
#modal-body ol { margin: 0; padding-left: 22px; }
#modal-body li { margin-bottom: 4px; }

#toast {
    position: fixed;
    left: 50%;
    bottom: 20px;
    transform: translate(-50%, 20px);
    background: var(--danger);
    color: #fff;
    padding: 8px 14px;
    border-radius: 8px;
    opacity: 0;
    pointer-events: none;
    transition: .2s;
    z-index: 50;
}
#toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 900px) {
    .layout { grid-template-columns: minmax(0, 1fr); padding: 12px 16px; }
    #nav { display: none; }
}