:root { font-family: Inter, ui-sans-serif, system-ui, sans-serif; color: #0a2540; background: #f6f9fc; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; }
.shell { width: min(100% - 40px, 1020px); margin: 0 auto; padding: 72px 0; }
header { max-width: 650px; margin-bottom: 38px; }
.eyebrow, .label { color: #635bff; font-size: .72rem; font-weight: 800; letter-spacing: .11em; margin: 0 0 10px; }
h1 { font-size: clamp(2.15rem, 5vw, 3.8rem); line-height: 1.05; letter-spacing: -.045em; margin: 0 0 15px; }
h2 { margin: 0; font-size: 1.2rem; }.subtitle, .card p { color: #52697f; line-height: 1.55; }
.card { background: white; border: 1px solid #e6edf4; box-shadow: 0 8px 28px #0a25400c; border-radius: 12px; }
.welcome { padding: 32px; max-width: 520px; }.button { display: inline-flex; align-items: center; gap: 30px; margin-top: 12px; padding: 13px 16px; border-radius: 7px; background: #635bff; color: white; text-decoration: none; font-weight: 700; }.button span { font-size: 1.25rem; }
.summary { display: grid; grid-template-columns: 1.25fr 1fr 1fr; gap: 18px; margin-bottom: 18px; }.summary article { min-height: 175px; padding: 24px; }.summary strong { font-size: clamp(2rem, 4vw, 3.2rem); letter-spacing: -.05em; }.summary p:last-child { font-size: .88rem; margin: 11px 0 0; }.grade-card { background: #0a2540; }.grade-card .label { color: #a8e6cf; }.grade-card strong { color: white; }.grade-card p:last-child { color: #d4e3ee; }
.chart-card { padding: 26px; }.chart-heading { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 28px; }.chart-heading .label { margin-bottom: 5px; }.sales-chart svg { width: 100%; display: block; }.sales-chart svg text { fill: #52697f; font-size: 12px; }.legend { display: flex; flex-wrap: wrap; gap: 20px; color: #52697f; font-size: .85rem; }.legend span { display: flex; align-items: center; gap: 7px; }.legend i { width: 22px; height: 3px; display: inline-block; }.sales-key { background: #635bff; height: 10px !important; width: 10px !important; border-radius: 2px; }.mean-key { background: #0a2540; }.std-key { background: repeating-linear-gradient(to right, #f59e0b 0 6px, transparent 6px 11px); }.text-button { appearance: none; border: 0; background: transparent; color: #635bff; font: inherit; font-weight: 700; cursor: pointer; }.message { color: #b42318; margin-top: 18px; }
.data-warning { margin: 0 0 18px; padding: 12px 14px; border: 1px solid #f2c94c; border-radius: 8px; background: #fff8db; color: #6b4f00; line-height: 1.45; }
@media (max-width: 700px) { .shell { width: min(100% - 28px, 1020px); padding: 42px 0; }.summary { grid-template-columns: 1fr; }.chart-card { padding: 20px; } }