.sheet-checker-page {
    width: 100%;
}

.sheet-checker-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
    padding: 22px 24px;
    margin-bottom: 16px;
    background: #0b1728;
    border: 1px solid #223a5c;
    border-top: 4px solid var(--ffo-gold, #f0c545);
}

.sheet-checker-heading h1 {
    margin: 0;
    color: var(--ffo-gold, #f0c545);
    font-size: 34px;
    line-height: 1.05;
    font-weight: 900;
    text-transform: uppercase;
}

.sheet-checker-heading p {
    margin: 8px 0 0;
    color: #ffffff;
    font-size: 16px;
    line-height: 1.35;
    font-weight: 700;
}

.sheet-checker-status {
    flex: 0 0 auto;
    min-width: 184px;
    padding: 12px 16px;
    color: var(--ffo-gold, #f0c545);
    font-size: 17px;
    line-height: 1.15;
    font-weight: 900;
    text-align: center;
    border: 1px solid rgba(240, 197, 69, 0.72);
    background: #0d1a2c;
}

.sheet-checker-grid {
    display: grid;
    grid-template-columns: 350px minmax(0, 1fr);
    gap: 16px;
    align-items: start;
}

.sheet-checker-panel {
    min-width: 0;
    padding: 22px;
    background: #0b1728;
    border: 1px solid #223a5c;
    border-top: 4px solid var(--ffo-gold, #f0c545);
}

.sheet-checker-panel h2 {
    margin: 0 0 17px;
    color: var(--ffo-gold, #f0c545);
    font-size: 22px;
    line-height: 1.2;
    font-weight: 900;
    text-transform: uppercase;
}

.sheet-checker-panel label {
    display: block;
    margin-bottom: 8px;
    color: #dce4f2;
    font-size: 16px;
    line-height: 1.2;
    font-weight: 900;
    text-transform: uppercase;
}

.sheet-checker-panel input[type="text"],
.sheet-checker-panel textarea {
    width: 100%;
    color: #ffffff;
    font-family: Montserrat, Arial, sans-serif;
    background: #07111f;
    border: 1px solid #223a5c;
    border-radius: 0;
    outline: none;
}

.sheet-checker-panel input[type="text"] {
    height: 60px;
    padding: 13px 15px;
    margin-bottom: 14px;
    font-size: 18px;
    line-height: 1.2;
    font-weight: 700;
}

.sheet-checker-panel textarea {
    min-height: 620px;
    padding: 15px;
    resize: vertical;
    font-family: Consolas, Monaco, monospace;
    font-size: 16px;
    line-height: 1.5;
    white-space: pre;
    tab-size: 2;
}

.sheet-checker-panel input[type="text"]:focus,
.sheet-checker-panel textarea:focus {
    border-color: var(--ffo-gold, #f0c545);
    box-shadow: 0 0 0 2px rgba(240, 197, 69, 0.18);
}

.sheet-checker-button {
    display: block;
    width: 100%;
    min-height: 60px;
    padding: 14px 16px;
    margin: 0 0 12px;
    color: #ffffff;
    font-family: Montserrat, Arial, sans-serif;
    font-size: 15px;
    line-height: 1.15;
    font-weight: 900;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    background: #101d31;
    border: 1px solid #223a5c;
    border-radius: 0;
}

.sheet-checker-button:hover,
.sheet-checker-button:focus {
    color: var(--ffo-gold, #f0c545);
    background: #14243b;
    border-color: var(--ffo-gold, #f0c545);
    outline: none;
}

.sheet-checker-button--primary,
.sheet-checker-submit-link {
    color: #07111f;
    background: var(--ffo-gold, #f0c545);
    border-color: var(--ffo-gold, #f0c545);
}

.sheet-checker-button--primary:hover,
.sheet-checker-button--primary:focus,
.sheet-checker-submit-link:hover,
.sheet-checker-submit-link:focus {
    color: #07111f;
    background: #f2d675;
    border-color: #f2d675;
}

.sheet-checker-button-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.sheet-checker-file-input {
    display: none;
}

.sheet-checker-result-panel {
    margin-top: 16px;
}

.sheet-checker-result {
    min-height: 215px;
    padding: 16px;
    color: #ffffff;
    font-family: Consolas, Monaco, monospace;
    font-size: 16px;
    line-height: 1.55;
    white-space: pre-wrap;
    overflow-x: auto;
    background: #07111f;
    border: 1px solid #223a5c;
}

.sheet-checker-result.good {
    border-color: #2e8b57;
    background: #0d2118;
}

.sheet-checker-result.bad {
    border-color: #a83f48;
    background: #2a1116;
}

.sheet-checker-result.warn {
    border-color: #c6922d;
    background: #2b2210;
}

/*
 * iPhone/iPad Safari:
 * FFO deliberately keeps its fixed-width desktop canvas. On touch devices,
 * make the editable fields physically large in CSS pixels so Safari does not
 * zoom into them when focused. No stacking/responsive layout is introduced.
 */
@media (hover: none) and (pointer: coarse) {
    .sheet-checker-panel input[type="text"] {
        height: 72px;
        padding: 14px 16px;
        font-size: 30px !important;
        line-height: 1;
    }

    .sheet-checker-panel textarea {
        font-size: 22px !important;
        line-height: 1.45;
    }

    .sheet-checker-button {
        min-height: 66px;
        font-size: 19px;
    }
}
.sheet-checker-submission fieldset { border: 1px solid var(--ffo-border); padding: 18px; }
.sheet-checker-submission fieldset:disabled { opacity: .6; }
.sheet-checker-submission legend { padding: 0 8px; }
.sheet-checker-submission p { line-height: 1.7; }
.sheet-checker-submission label { display: block; margin: 14px 0 7px; }
.sheet-checker-submission input, .sheet-checker-submission select { width: 100%; max-width: 480px; padding: 12px; background: var(--ffo-bg); border: 1px solid #58657a; color: var(--ffo-text); font: inherit; }
#checker-submit-receipt { margin-top: 18px; white-space: pre-wrap; line-height: 1.8; }
.sheet-checker-submit-error { color: #ffb2b2; }
.sheet-checker-submit-success { color: #9ce3b9; }