:root {
    --green:       #005F40;
    --green-hover: #004D34;
    --green-light: #E8F4EF;
    --green-mid:   #4A9B82;
    --text:        #1A1A1A;
    --text-muted:  #555;
    --border:      #D0D7D3;
    --bg:          #F4F6F5;
    --white:       #FFFFFF;
    --fail-color:  #B91C1C;
    --fail-bg:     #FEF2F2;
    --warn-bg:     #FFFBEA;
    --warn-border: #F0C030;
    --warn-text:   #5A4A00;
    --shadow:      0 2px 10px rgba(0,0,0,0.08);
    --radius:      8px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

/* ── Header ── */
header {
    background: var(--green);
    color: #fff;
    padding: 2rem 1.5rem 1.8rem;
}
.header-inner {
    max-width: 860px;
    margin: 0 auto;
}
header .label {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    opacity: 0.75;
    margin-bottom: 0.35rem;
}
header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.25;
}
header p {
    margin-top: 0.4rem;
    opacity: 0.82;
    font-size: 0.97rem;
}

/* ── Layout ── */
main {
    max-width: 860px;
    margin: 2rem auto 3rem;
    padding: 0 1rem;
}

/* ── Cards ── */
.card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.25rem;
}
.card-title {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--green);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 1rem;
    padding-bottom: 0.6rem;
    border-bottom: 2px solid var(--green-light);
}

/* ── Form controls ── */
.form-row {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    flex: 1;
    min-width: 200px;
}
label {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-muted);
}
select,
input[type="number"],
input[type="text"] {
    padding: 0.58rem 0.8rem;
    border: 1.5px solid var(--border);
    border-radius: 6px;
    font-size: 0.93rem;
    color: var(--text);
    background: var(--white);
    width: 100%;
    transition: border-color 0.15s, box-shadow 0.15s;
}
select:focus,
input:focus {
    outline: none;
    border-color: var(--green);
    box-shadow: 0 0 0 3px rgba(0,95,64,0.12);
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.58rem 1.15rem;
    border: none;
    border-radius: 6px;
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s;
    white-space: nowrap;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--green); color: #fff; }
.btn-primary:hover { background: var(--green-hover); }
.btn-ghost {
    background: transparent;
    color: var(--fail-color);
    border: 1.5px solid #FECACA;
    padding: 0.3rem 0.65rem;
    font-size: 0.82rem;
}
.btn-ghost:hover { background: var(--fail-bg); }

/* ── Scale info badge ── */
.scale-badge {
    display: inline-block;
    background: var(--green-light);
    color: var(--green);
    font-size: 0.82rem;
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    margin-top: 0.9rem;
}
.scale-badge a { color: inherit; }

/* ── Course table ── */
.table-wrap { overflow-x: auto; }
.table-wrap table { min-width: max-content; }
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}
thead th {
    text-align: left;
    padding: 0.55rem 0.75rem;
    background: var(--green-light);
    color: var(--green);
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}
thead th:last-child { width: 44px; position: sticky; right: 0; background: var(--green-light); z-index: 1; }
tbody tr { border-bottom: 1px solid #F0F3F1; }
tbody tr:last-child { border-bottom: none; }
tbody td { padding: 0.45rem 0.75rem; vertical-align: middle; }
tbody td:last-child { position: sticky; right: 0; background: var(--white); }

td select { min-width: 220px; }
td input[type="number"] { width: 90px; }
td input[type="text"]   { min-width: 130px; }
.num-grade-input { min-width: 0; width: 100%; font-size: 0.82rem; }

.sp-nv-cell { display: flex; flex-direction: column; gap: 0.2rem; }
.sp-nv-cell input[type="number"] { width: 80px; }
.sp-nv-cell > div { font-size: 0.88rem; }

.val-pass { font-weight: 600; color: var(--green); }
.val-fail { font-weight: 600; color: var(--fail-color); }

.add-row {
    margin-top: 1rem;
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-wrap: wrap;
}

/* ── Notice ── */
.notice {
    background: var(--warn-bg);
    border-left: 4px solid var(--warn-border);
    color: var(--warn-text);
    padding: 0.7rem 1rem;
    font-size: 0.83rem;
    border-radius: 0 6px 6px 0;
    margin-top: 1.1rem;
    line-height: 1.5;
}
.notice a { color: inherit; }

/* ── Result cards ── */
.result-cards {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1.25rem;
}
.result-card {
    flex: 1 1 280px;
    background: var(--green);
    color: #fff;
    border-radius: var(--radius);
    padding: 1.75rem 1.5rem;
    box-shadow: var(--shadow);
}
.result-card--core { background: var(--green-mid); }

td.core-check { text-align: center; width: 2.5rem; }
td.core-check input[type="checkbox"] { width: 1rem; height: 1rem; cursor: pointer; accent-color: var(--green); }

.result-card h2 {
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    opacity: 0.75;
    margin-bottom: 1.1rem;
}
.result-grid {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    align-items: flex-end;
}
.result-item { display: flex; flex-direction: column; gap: 0.15rem; }
.result-item .lbl {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    opacity: 0.72;
}
.result-item .big { font-size: 3rem; font-weight: 800; line-height: 1; }
.result-item .mid { font-size: 1.6rem; font-weight: 700; line-height: 1.1; }
.result-item .sm  { font-size: 1.1rem; font-weight: 600; }

.letter-desc {
    margin-top: 0.3rem;
    font-size: 0.82rem;
    opacity: 0.75;
}

/* ── Conversion table (reference) ── */
details { margin-top: 0.5rem; }
details summary {
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--green);
    font-weight: 600;
    padding: 0.4rem 0;
    user-select: none;
}
details summary:hover { text-decoration: underline; }
.ref-table {
    margin-top: 0.75rem;
    width: 100%;
    font-size: 0.83rem;
    border-collapse: collapse;
}
.ref-table th {
    text-align: left;
    padding: 0.4rem 0.6rem;
    background: var(--green-light);
    color: var(--green);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.ref-table td {
    padding: 0.35rem 0.6rem;
    border-bottom: 1px solid #F0F3F1;
}
.ref-table tr:last-child td { border-bottom: none; }
.ref-table .fail-row td { color: var(--fail-color); }

/* ── Outline button (for section actions area) ── */
.btn-outline {
    background: transparent;
    color: var(--green);
    border: 1.5px solid var(--green);
}
.btn-outline:hover { background: var(--green-light); }

/* ── Section actions row ── */
.section-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    margin-bottom: 1.25rem;
}

/* ── Secondary button ── */
.btn-secondary {
    background: rgba(255,255,255,0.15);
    color: #fff;
    border: 1.5px solid rgba(255,255,255,0.4);
    font-size: 0.82rem;
    padding: 0.4rem 0.9rem;
}
.btn-secondary:hover { background: rgba(255,255,255,0.25); }

/* ── Save form ── */
.save-form-inner {
    display: flex;
    gap: 0.75rem;
    align-items: flex-end;
    flex-wrap: wrap;
    margin-top: 0.9rem;
}
.save-form-inner .form-group { max-width: 260px; }

/* ── Saved table ── */
.saved-country { font-size: 0.82rem; opacity: 0.65; }
.saved-actions { display: flex; gap: 0.3rem; align-items: center; white-space: nowrap; }

/* ── Utilities ── */
.hidden { display: none !important; }

footer {
    text-align: center;
    padding: 1.5rem;
    font-size: 0.78rem;
    color: #888;
}
footer a { color: #888; }
footer p { margin-top: 0.35rem; }
footer p:first-child { margin-top: 0; }

/* ── Disclaimer modal ── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}
.modal-box {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: 0 8px 32px rgba(0,0,0,0.18);
    max-width: 520px;
    width: 100%;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.modal-box h2 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--green);
}
.modal-box p {
    font-size: 0.9rem;
    line-height: 1.65;
    color: var(--text);
}

@media (max-width: 600px) {
    header h1 { font-size: 1.35rem; }
    .result-item .big { font-size: 2.2rem; }
    .form-group { min-width: 100%; }
}