.tkb-email-page {
    --email-navy: #0b2340;
    --email-navy-mid: #123b66;
    --email-blue: #2563eb;
    --email-blue-soft: #eaf2ff;
    --email-orange: #f97316;
    --email-orange-deep: #dd5a08;
    --email-line: #dce6f1;
    --email-ink: #172b46;
    width: min(1120px, 100%);
    margin: 0 auto;
    padding: 24px 16px 40px;
    color: var(--email-ink);
    font-family: 'Inter', system-ui, sans-serif;
}

.tkb-email-settings { max-width: 820px; }
.tkb-email-history { max-width: 1220px; }

.tkb-email-page .email-hero {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    overflow: hidden;
    min-height: 170px;
    margin-bottom: 18px;
    padding: 30px 34px;
    border-radius: 18px;
    color: #fff;
    background: linear-gradient(115deg, #071b32 0%, var(--email-navy) 50%, var(--email-navy-mid) 100%);
    box-shadow: 0 16px 36px rgba(11, 35, 64, .18);
}

.tkb-email-page .email-hero::before {
    content: '';
    position: absolute;
    inset: 0 0 auto;
    height: 4px;
    background: linear-gradient(90deg, var(--email-orange) 0%, #fb923c 42%, #60a5fa 100%);
}

.tkb-email-page .email-hero::after {
    content: '';
    position: absolute;
    width: 250px;
    height: 250px;
    right: -75px;
    top: -105px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(59, 130, 246, .27), transparent 70%);
}

.tkb-email-page .email-hero-copy,
.tkb-email-page .email-hero-mark { position: relative; z-index: 1; }

.tkb-email-page .email-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
    color: #fed7aa;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: .12em;
}

.tkb-email-page .email-hero h1 {
    margin: 0 0 7px;
    color: #fff;
    font-size: clamp(22px, 3vw, 30px);
    font-weight: 800;
    line-height: 1.25;
}

.tkb-email-page .email-hero p {
    margin: 0;
    color: #d1e1f4;
    font-size: 14px;
    line-height: 1.6;
}

.tkb-email-page .email-hero-mark {
    display: grid;
    place-items: center;
    flex: 0 0 82px;
    width: 82px;
    height: 82px;
    border: 1px solid rgba(255,255,255,.23);
    border-radius: 22px;
    background: rgba(255,255,255,.1);
    color: #fdba74;
    font-size: 37px;
    transform: rotate(-6deg);
}

.tkb-email-page .email-card {
    overflow: hidden;
    border: 1px solid var(--email-line);
    border-radius: 18px;
    background: #fff;
    box-shadow: 0 10px 30px rgba(14, 43, 78, .08);
}

.tkb-email-page .email-card-body { padding: 26px 30px 30px; }

.tkb-email-page .email-section-heading {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--email-line);
}

.tkb-email-page .email-section-heading--compact { margin-top: 24px; }

.tkb-email-page .email-step {
    display: grid;
    place-items: center;
    flex: 0 0 34px;
    width: 34px;
    height: 34px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--email-orange), #fb923c);
    color: #fff;
    font-size: 13px;
    font-weight: 800;
}

.tkb-email-page .email-section-heading h2,
.tkb-email-page .email-results-title {
    margin: 1px 0 3px;
    color: var(--email-navy);
    font-size: 17px;
    font-weight: 800;
}

.tkb-email-page .email-section-heading p {
    margin: 0;
    color: #64748b;
    font-size: 12px;
}

.tkb-email-page .form-label {
    margin-bottom: 7px;
    color: var(--email-navy);
    font-size: 13px;
    font-weight: 700;
}

.tkb-email-page .form-control,
.tkb-email-page .form-select {
    min-height: 43px;
    border: 1px solid #cbd9e8;
    border-radius: 10px;
    background-color: #f9fbfe;
    color: var(--email-ink);
    font-size: 13px;
}

.tkb-email-page .form-control:focus,
.tkb-email-page .form-select:focus {
    border-color: var(--email-blue);
    background-color: #fff;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .13);
}

.tkb-email-page .form-control[readonly] { background: #edf3fa; color: #48627e; }
.tkb-email-page .form-check-label { color: var(--email-ink); font-size: 13px; }
.tkb-email-page .form-check-input { border-color: #a9bfd7; cursor: pointer; }
.tkb-email-page .form-check-input:checked { background-color: var(--email-blue); border-color: var(--email-blue); }
.tkb-email-page .form-check-input:focus { box-shadow: 0 0 0 3px rgba(37, 99, 235, .15); }
.tkb-email-page .text-muted { color: #65788d !important; font-size: 12px; }

.tkb-email-page .email-table-wrap {
    overflow-x: auto;
    border: 1px solid var(--email-line);
    border-radius: 12px;
}

.tkb-email-page .email-teacher-list { max-height: 340px; overflow-y: auto; }
.tkb-email-page .email-table-wrap .table { min-width: 560px; margin: 0; font-size: 13px; }
.tkb-email-page .email-table-wrap thead th {
    position: sticky;
    top: 0;
    z-index: 1;
    padding: 11px 13px;
    border: 0;
    border-bottom: 3px solid var(--email-orange);
    background: var(--email-navy);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
}

.tkb-email-page .email-table-wrap tbody td {
    padding: 10px 13px;
    border-color: #eaf0f7;
    color: var(--email-ink);
    vertical-align: middle;
}

.tkb-email-page .email-table-wrap tbody tr:hover td { background: var(--email-blue-soft); }
.tkb-email-page .email-table-wrap tbody tr:nth-child(even) td { --bs-table-bg: #f8fbff; }
.tkb-email-page .email-table-wrap tbody tr:nth-child(even):hover td { --bs-table-bg: var(--email-blue-soft); }

.tkb-email-page .email-options {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 26px;
    padding: 15px 18px;
    border: 1px solid #d8e5f4;
    border-radius: 12px;
    background: #f2f7ff;
}

.tkb-email-page .email-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
}

.tkb-email-page .email-count { margin: 0 auto 0 0; color: #536b85; font-size: 13px; font-weight: 600; }
.tkb-email-page .email-count strong,
.tkb-email-page .email-total {
    display: inline-block;
    margin-left: 5px;
    padding: 3px 9px;
    border-radius: 999px;
    background: #fff0e3;
    color: var(--email-orange-deep);
    font-weight: 800;
}

.tkb-email-page .email-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 39px;
    padding: 8px 16px;
    border-radius: 10px;
    font-size: 13px;
    font-weight: 700;
    transition: background .18s, box-shadow .18s, transform .18s;
}

.tkb-email-page .email-btn--orange {
    border: 1px solid var(--email-orange-deep);
    background: linear-gradient(135deg, var(--email-orange), var(--email-orange-deep));
    color: #fff;
    box-shadow: 0 5px 12px rgba(249, 115, 22, .2);
}

.tkb-email-page .email-btn--orange:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--email-orange-deep), #b94706);
    color: #fff;
    transform: translateY(-1px);
}

.tkb-email-page .email-btn--outline {
    border: 1px solid #98b8e1;
    background: #fff;
    color: #174883;
}

.tkb-email-page .email-btn--outline:hover:not(:disabled) {
    border-color: var(--email-blue);
    background: var(--email-blue-soft);
    color: #123f76;
}

.tkb-email-page .email-btn:disabled { opacity: .55; box-shadow: none; }
.tkb-email-page .email-btn:focus-visible { outline: 3px solid #93c5fd; outline-offset: 2px; }
.tkb-email-page .email-progress {
    padding: 14px 16px;
    border: 1px solid #b8d4f6;
    border-radius: 11px;
    background: var(--email-blue-soft);
    color: var(--email-navy);
    font-size: 13px;
    line-height: 1.7;
}

.tkb-email-page .progress { height: 10px; border-radius: 999px; background: #e4edf8; }
.tkb-email-page .progress-bar { background: linear-gradient(90deg, var(--email-blue), var(--email-orange)); }
.tkb-email-page .email-results-title { margin: 28px 0 13px; }
.tkb-email-page .email-configured { display: inline-block; margin-top: 8px; color: #1d4f8c; font-size: 12px; font-weight: 700; }

.tkb-email-page .email-status {
    display: inline-block;
    padding: 5px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
}

.tkb-email-page .email-status--sent { background: #e8f1ff; color: #174883; }
.tkb-email-page .email-status--failed { background: #fff0e6; color: #a6490a; }
.tkb-email-page .email-empty { display: flex; align-items: center; justify-content: center; gap: 8px; padding: 24px; color: #64748b; font-size: 13px; }
.tkb-email-page .email-empty i { color: var(--email-blue); font-size: 20px; }
.tkb-email-page .alert { border-radius: 10px; font-size: 13px; }
.tkb-email-page .alert-success { border-color: #b9d6f9; background: #edf5ff; color: #16477d; }
.tkb-email-page .alert-info { border-color: #b9d6f9; background: #edf5ff; color: #16477d; }

@media (max-width: 640px) {
    .tkb-email-page { padding: 14px 8px 28px; }
    .tkb-email-page .email-hero { min-height: 0; padding: 23px 19px; border-radius: 14px; }
    .tkb-email-page .email-hero-mark { display: none; }
    .tkb-email-page .email-card-body { padding: 20px 15px; }
    .tkb-email-page .email-actions { align-items: stretch; }
    .tkb-email-page .email-count { flex-basis: 100%; }
    .tkb-email-page .email-actions .email-btn { flex: 1 1 auto; }
}