:root {
    --ink: #333333;
    --paper: #FFFFFF;
    --line: #CCCCCC;
    --pencil: #666666;
    --btn-bg: #2B5A75;
    --btn-hover: #1E4156;
    --green: #1F7A3D;
    --red: #A6301E;
    --sans: Arial, Helvetica, sans-serif;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: var(--sans);
    background: var(--paper);
    color: var(--ink);
    padding: 20px;
    line-height: 1.4;
}

.wrap { max-width: 560px; margin: 0 auto; width: 100%; }
h1 { font-size: 28px; margin: 0 0 6px 0; color: #000; }
.sub { color: var(--pencil); font-size: 14px; margin-bottom: 24px; }

.field-label {
    display: block;
    font-size: 13px;
    font-weight: bold;
    color: #000;
    margin: 18px 0 6px 0;
}

.course-list { border: 1px solid #EEE; border-top: none; }

.course-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0;
    padding: 10px 12px;
    border-top: 1px solid #EEE;
    cursor: pointer;
}
.course-row:hover { background: #F7F7F7; }
.course-row input { width: 17px; height: 17px; flex-shrink: 0; margin: 0; }
.course-swatch { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.course-row .name { font-size: 14px; }

.btn-row { display: flex; gap: 10px; margin-top: 22px; }

button {
    font-family: var(--sans);
    font-size: 14px;
    font-weight: bold;
    border: none;
    padding: 13px;
    cursor: pointer;
}

.save-btn { flex: 1 1 auto; background: var(--btn-bg); color: #fff; }
.save-btn:hover { background: var(--btn-hover); }

.unsub-btn {
    flex: 0 0 auto;
    background: #fff;
    color: var(--red);
    border: 2px solid var(--red) !important;
    padding: 11px 16px;
}
.unsub-btn:hover { background: #FBEAE7; }
button:disabled { opacity: .6; cursor: not-allowed; }

.msg {
    margin-top: 16px;
    margin-bottom: 0;
    font-size: 13.5px;
    line-height: 1.6;
    padding: 12px 14px;
    display: none;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
    text-align: left;
}

.msg.show { 
    display: block;
    margin-left: auto; 
    margin-right: auto; 
    width: fit-content; 
}

.msg.ok-green { background: #E7F1E4; border: 1px solid #B7D3AE; color: var(--green); }
.msg.err { background: #F6E3DF; border: 1px solid #E0B4A9; color: var(--red); }

.loading, .empty { color: var(--pencil); font-size: 14px; padding: 14px 0; }
.hint { font-size: 12px; color: var(--pencil); margin-top: 8px; }

.footer {
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px solid #EEE;
    font-size: 11.5px;
    color: var(--pencil);
    text-align: center;
}
.footer a { color: var(--pencil); }