:root {
        --ud-red: #CE0037;
        --ud-blue: #003087;
        --ink: #14213D;
        --muted: #526176;
        --surface: #FFFFFF;
        --background: #F6F8FB;
        --success: #137A4B;
        --warning: #9A5B00;
    }

    .stApp { background: var(--background); }
    [data-testid="stHeaderActionElements"] { display: none; }
    [data-testid="stToolbar"] { visibility: hidden; height: 0; }
    [data-testid="stDecoration"] { background: var(--ud-red); }
    .block-container { max-width: 1160px; padding-top: 1.6rem; padding-bottom: 4rem; }

    h1, h2, h3 { color: var(--ink); letter-spacing: -0.02em; }
    p, li, label { color: var(--ink); }

    .hero {
        background: linear-gradient(125deg, #00245F 0%, var(--ud-blue) 62%, #164E91 100%);
        border-top: 7px solid var(--ud-red);
        border-radius: 18px;
        padding: 2rem 2.2rem 1.8rem;
        margin-bottom: 1.15rem;
        box-shadow: 0 14px 34px rgba(0, 48, 135, 0.16);
    }
    .hero-kicker {
        color: #FFFFFF;
        font-size: 0.82rem;
        font-weight: 800;
        letter-spacing: 0.12em;
        margin-bottom: 0.45rem;
    }
    .hero h1 { color: #FFFFFF; font-size: clamp(2rem, 4vw, 3.3rem); margin: 0; }
    .hero p { color: #EEF4FF; font-size: 1.08rem; margin: 0.7rem 0 0; max-width: 760px; }

    .stage-row {
        display: grid;
        grid-template-columns: repeat(5, 1fr);
        gap: 0.45rem;
        margin: 0 0 1.4rem;
    }
    .stage-pill {
        background: #E9EDF4;
        border: 1px solid #D6DCE7;
        border-radius: 999px;
        color: #5B6778;
        font-size: 0.78rem;
        font-weight: 700;
        padding: 0.52rem 0.7rem;
        text-align: center;
    }
    .stage-pill.complete { background: #E7F4ED; border-color: #A8D5BE; color: #0A653D; }
    .stage-pill.active { background: var(--ud-red); border-color: var(--ud-red); color: #FFFFFF; }

    .eyebrow { color: var(--ud-red); font-size: 0.78rem; font-weight: 800; letter-spacing: 0.1em; }
    .lead { color: var(--muted); font-size: 1.06rem; max-width: 820px; }

    .event-card {
        background: var(--surface);
        border: 1px solid #DCE2EB;
        border-left: 7px solid var(--ud-blue);
        border-radius: 14px;
        padding: 1.2rem 1.35rem;
        margin: 0.7rem 0 1rem;
        box-shadow: 0 8px 22px rgba(20, 33, 61, 0.06);
    }
    .event-card .document { color: var(--ud-blue); font-size: 0.8rem; font-weight: 800; letter-spacing: 0.05em; text-transform: uppercase; }
    .event-card h3 { margin: 0.25rem 0 0.45rem; }
    .event-card p { font-size: 1.05rem; margin: 0; }

    .concept-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.8rem; margin: 1rem 0 1.4rem; }
    .concept-card { background: #FFFFFF; border: 1px solid #DCE2EB; border-radius: 13px; padding: 1rem; }
    .concept-number { color: var(--ud-red); font-weight: 900; font-size: 1.15rem; }
    .concept-card strong { color: var(--ud-blue); display: block; margin: 0.2rem 0; }
    .concept-card span { color: var(--muted); font-size: 0.92rem; }

    .equation-anchor { scroll-margin-top: 1rem; }
    .equation-board { align-items: stretch; display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr); gap: 0.5rem; margin: 0.8rem 0 0.65rem; }
    .equation-component { background: #EEF4FF; border: 1px solid #C7D8F4; border-radius: 13px; color: var(--ud-blue); min-width: 0; padding: 0.75rem; text-align: center; }
    .equation-component-label { display: block; font-size: 0.78rem; font-weight: 800; letter-spacing: 0.04em; text-transform: uppercase; }
    .equation-component-value { display: block; font-size: clamp(1.05rem, 2.1vw, 1.35rem); font-variant-numeric: tabular-nums; font-weight: 900; margin-top: 0.12rem; }
    .equation-operator { align-self: start; color: var(--ud-blue); font-size: 1.5rem; font-weight: 900; padding-top: 1.05rem; }
    .equation-component-changes { display: grid; gap: 0.35rem; margin-top: 0.55rem; }
    .equation-change-pill { border: 1px solid; border-radius: 9px; font-size: 0.76rem; font-weight: 800; line-height: 1.25; padding: 0.4rem 0.45rem; }
    .equation-change-pill.increase { background: #E7F4ED; border-color: #A8D5BE; color: #0A653D; }
    .equation-change-pill.decrease { background: #FFF0F1; border-color: #E7ABB7; color: #A32638; }
    .equation-change-pill .direction { font-size: 1rem; margin-right: 0.2rem; }

    .feedback-row {
        align-items: flex-start;
        background: #FFFFFF;
        border: 1px solid #DCE2EB;
        border-radius: 10px;
        display: flex;
        gap: 1rem;
        justify-content: space-between;
        margin: 0.42rem 0;
        padding: 0.72rem 0.85rem;
    }
    .feedback-row.correct { border-left: 5px solid var(--success); }
    .feedback-row.review { border-left: 5px solid var(--warning); }
    .feedback-label { font-weight: 760; }
    .feedback-detail { color: var(--muted); font-size: 0.9rem; margin-top: 0.12rem; }
    .feedback-value { color: var(--ink); font-variant-numeric: tabular-nums; white-space: nowrap; }

    .statement { background: #FFFFFF; border: 1px solid #DCE2EB; border-radius: 13px; padding: 1rem 1.05rem; }
    .statement-title { color: var(--ud-blue); font-size: 1.05rem; font-weight: 850; margin-bottom: 0.1rem; text-align: center; }
    .statement-period { color: var(--muted); font-size: 0.82rem; margin-bottom: 0.7rem; text-align: center; }
    .statement-line { display: flex; gap: 0.8rem; justify-content: space-between; padding: 0.3rem 0; }
    .statement-line.indent { padding-left: 1rem; }
    .statement-line.total { border-top: 1px solid #7C8799; font-weight: 800; margin-top: 0.2rem; padding-top: 0.45rem; }
    .statement-line.grand-total { border-bottom: 3px double var(--ink); border-top: 1px solid var(--ink); font-weight: 850; margin-top: 0.25rem; padding: 0.45rem 0 0.35rem; }
    .statement-section { color: var(--ud-red); font-size: 0.82rem; font-weight: 850; letter-spacing: 0.05em; margin-top: 0.55rem; text-transform: uppercase; }
    .amount { font-variant-numeric: tabular-nums; white-space: nowrap; }

    .flow-note {
        background: #FFF5F7;
        border-left: 5px solid var(--ud-red);
        border-radius: 10px;
        color: var(--ink);
        margin: 0.55rem 0;
        padding: 0.8rem 0.9rem;
    }
    .score-box {
        background: linear-gradient(135deg, #FFFFFF 0%, #F2F6FC 100%);
        border: 1px solid #DCE2EB;
        border-radius: 14px;
        padding: 1rem 1.1rem;
        text-align: center;
    }
    .score-box strong { color: var(--ud-blue); display: block; font-size: 1.65rem; }
    .score-box span { color: var(--muted); font-size: 0.87rem; }

    .stButton > button, .stFormSubmitButton > button { border-radius: 9px; font-weight: 760; min-height: 2.7rem; }
    .stButton > button[kind="primary"], .stFormSubmitButton > button[kind="primary"] { background: var(--ud-red); border-color: var(--ud-red); color: #FFFFFF; }
    .stButton > button[kind="primary"]:hover, .stFormSubmitButton > button[kind="primary"]:hover { background: #A9002E; border-color: #A9002E; color: #FFFFFF; }
    .stButton > button[kind="secondary"] { background: #FFFFFF; border-color: #AAB4C5; color: var(--ink); }

    @media (max-width: 760px) {
        .block-container { padding-left: 1rem; padding-right: 1rem; }
        .hero { padding: 1.45rem 1.25rem; }
        .stage-row { grid-template-columns: 1fr; gap: 0.25rem; }
        .stage-pill { display: none; }
        .stage-pill.active { display: block; }
        .concept-grid { grid-template-columns: 1fr; }
        .equation-board { grid-template-columns: 1fr; }
        .equation-operator { display: none; }
        .feedback-row { display: block; }
        .feedback-value { display: block; margin-top: 0.35rem; }
    }