:root {
    color-scheme: light dark;
    --bg: #f5f7fa;
    --panel: #ffffff;
    --text: #172033;
    --muted: #667085;
    --border: #d9dee8;
    --accent: #2f6fed;
    --accent-hover: #245dcc;
    --notice: #eef4ff;
    --danger: #fff0f0;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #111827;
        --panel: #1f2937;
        --text: #f3f4f6;
        --muted: #a8b0bd;
        --border: #374151;
        --accent: #6ea0ff;
        --accent-hover: #8bb2ff;
        --notice: #17243d;
        --danger: #3b1d22;
    }
}

* { box-sizing: border-box; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.topbar {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: center;
    padding: 1.4rem clamp(1rem, 4vw, 3rem);
    background: var(--panel);
    border-bottom: 1px solid var(--border);
}
.eyebrow {
    margin: 0 0 .25rem;
    color: var(--accent);
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .09em;
    text-transform: uppercase;
}
h1 { margin: 0; font-size: clamp(1.4rem, 3vw, 2rem); }
.muted { margin: .35rem 0 0; color: var(--muted); font-size: .9rem; }
.header-actions { display: flex; gap: .6rem; flex-wrap: wrap; }
.button {
    appearance: none;
    border: 1px solid var(--accent);
    border-radius: .6rem;
    padding: .65rem .9rem;
    background: var(--accent);
    color: #fff;
    cursor: pointer;
    font: inherit;
    font-weight: 650;
    text-decoration: none;
}
.button:hover { background: var(--accent-hover); }
.button.secondary { background: transparent; color: var(--accent); }
main { padding: 1.25rem clamp(1rem, 4vw, 3rem) 3rem; }
.summary {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: .75rem;
    margin-bottom: 1rem;
}
.summary article {
    padding: .9rem 1rem;
    border: 1px solid var(--border);
    border-radius: .75rem;
    background: var(--panel);
}
.summary span { display: block; color: var(--muted); font-size: .8rem; }
.summary strong { display: block; margin-top: .2rem; font-size: 1.4rem; }
.controls {
    display: grid;
    grid-template-columns: repeat(3, minmax(9rem, 1fr)) minmax(14rem, 2fr);
    gap: .75rem;
    align-items: end;
    margin-bottom: 1rem;
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: .75rem;
    background: var(--panel);
}
.controls label { color: var(--muted); font-size: .8rem; font-weight: 650; }
.controls select,
.controls input {
    display: block;
    width: 100%;
    margin-top: .35rem;
    border: 1px solid var(--border);
    border-radius: .55rem;
    padding: .62rem .7rem;
    background: var(--panel);
    color: var(--text);
    font: inherit;
}
.notice,
.loading,
.empty {
    margin: 1rem 0;
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: .7rem;
    background: var(--notice);
}
.notice.error { background: var(--danger); }
.gantt-wrap {
    overflow-x: auto;
    min-height: 22rem;
    border: 1px solid var(--border);
    border-radius: .75rem;
    background: #fff;
}
#gantt { min-width: 100%; }
.gantt-container { overflow: visible; }
.bar-wrapper.sprint .bar { fill: #475569; }
.bar-wrapper.story .bar { fill: #2f6fed; }
.bar-wrapper.task .bar { fill: #7c9ee8; }
.bar-wrapper.sprint .bar-progress { fill: #1f2937; }
.bar-wrapper.story .bar-progress { fill: #184cba; }
.bar-wrapper.task .bar-progress { fill: #527ed7; }

@media (max-width: 800px) {
    .topbar { align-items: flex-start; flex-direction: column; }
    .summary { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .controls { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .search-label { grid-column: 1 / -1; }
}

@media (max-width: 480px) {
    .summary, .controls { grid-template-columns: 1fr; }
    .search-label { grid-column: auto; }
}