/* ══════════════════════════════════════════════════════════
   TutorX shared components.
   Single-class selectors only; no !important — page styles
   loaded after this file win ties during migration.
   ══════════════════════════════════════════════════════════ */

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 12px 24px;
    border-radius: var(--radius-pill);
    font-family: var(--font-sans);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    border: 1px solid transparent;
    white-space: nowrap;
    transition: transform 0.2s ease, opacity 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }

.btn-primary {
    background: var(--ink-btn);
    color: var(--ink-btn-text);
}
.btn-primary:hover:not(:disabled) { transform: translateY(-1px); opacity: 0.92; }

.btn-accent {
    background: var(--accent);
    color: var(--accent-on);
}
.btn-accent:hover:not(:disabled) { background: var(--accent-strong); transform: translateY(-1px); }

.btn-secondary {
    background: transparent;
    color: var(--text);
    border-color: var(--border-strong);
}
.btn-secondary:hover:not(:disabled) { border-color: var(--text-secondary); transform: translateY(-1px); }

.btn-danger {
    background: transparent;
    color: var(--danger);
    border-color: var(--danger);
}
.btn-danger:hover:not(:disabled) { background: var(--danger-soft); }

.btn-sm { padding: 8px 16px; font-size: 13px; }

/* ── Form fields ── */
.field { margin-bottom: var(--space-4); }

.field-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
    letter-spacing: 0.01em;
}

.field-input {
    width: 100%;
    padding: 12px 14px;
    background: var(--surface-input);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    font-size: 15px;
    color: var(--text);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.field-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.field-input::placeholder { color: var(--text-tertiary); }

.field-hint { font-size: 12px; color: var(--text-tertiary); margin-top: 4px; }
.field-error { font-size: 13px; color: var(--danger); margin-top: 4px; }

/* ── Cards ── */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
}

.card-hover { transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease; }
.card-hover:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-card);
    border-color: var(--border-strong);
}

/* ── Badges ── */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: var(--radius-pill);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.badge-success { background: var(--success-soft); color: var(--success); }
.badge-warning { background: var(--warning-soft); color: var(--warning); }
.badge-danger  { background: var(--danger-soft);  color: var(--danger); }
.badge-accent  { background: var(--accent-soft);  color: var(--accent); }
.badge-neutral { background: var(--bg-sunken);    color: var(--text-secondary); }

/* ── Tables ── */
.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.table th {
    text-align: left;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-tertiary);
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-strong);
}

.table td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
    vertical-align: middle;
}

.table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    /* edge shadows hint at hidden columns */
    background:
        linear-gradient(to right, var(--bg-card) 30%, transparent),
        linear-gradient(to left,  var(--bg-card) 30%, transparent) 100% 0,
        radial-gradient(farthest-side at 0 50%, rgba(0,0,0,0.14), transparent),
        radial-gradient(farthest-side at 100% 50%, rgba(0,0,0,0.14), transparent) 100% 0;
    background-repeat: no-repeat;
    background-size: 48px 100%, 48px 100%, 16px 100%, 16px 100%;
    background-attachment: local, local, scroll, scroll;
}

/* Mobile card fallback: rows become stacked cards, cells labeled
   via data-label. Opt in with .table-cards on the <table>. */
@media (max-width: 768px) {
    .table-cards { min-width: 0; }
    .table-cards thead { display: none; }
    .table-cards, .table-cards tbody, .table-cards tr, .table-cards td { display: block; width: 100%; }
    .table-cards tr {
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        background: var(--bg-card);
        margin-bottom: var(--space-3);
        padding: var(--space-2) 0;
    }
    .table-cards td {
        display: flex;
        justify-content: space-between;
        align-items: center;
        gap: var(--space-3);
        border-bottom: none;
        padding: 8px 14px;
        text-align: right;
    }
    .table-cards td::before {
        content: attr(data-label);
        font-size: 11px;
        font-weight: 600;
        text-transform: uppercase;
        letter-spacing: 0.06em;
        color: var(--text-tertiary);
        text-align: left;
        flex-shrink: 0;
    }
    .table-cards td:not([data-label])::before { content: none; }
}

/* ── Tabs ── */
.tab-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: 9px 18px;
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    background: transparent;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.tab-btn:hover { color: var(--text); border-color: var(--border-strong); }

.tab-btn[aria-selected="true"] {
    background: var(--accent-soft);
    color: var(--accent);
    border-color: var(--border-accent);
}

.tab-count {
    min-width: 20px;
    padding: 1px 6px;
    border-radius: var(--radius-pill);
    background: var(--bg-sunken);
    color: var(--text-secondary);
    font-size: 11px;
    text-align: center;
}

/* ── Modal ── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(20, 17, 13, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    z-index: 1500;
}

.modal {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    max-width: 560px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    padding: var(--space-6);
}

/* ── Empty state ── */
.empty-state {
    text-align: center;
    padding: var(--space-7) var(--space-5);
    color: var(--text-secondary);
}

.empty-state-icon { font-size: 32px; margin-bottom: var(--space-3); opacity: 0.7; }

.empty-state-title {
    font-family: var(--font-serif);
    font-size: 22px;
    color: var(--text);
    margin-bottom: var(--space-2);
}

.empty-state-body { font-size: 14px; max-width: 380px; margin: 0 auto var(--space-4); }

/* ── Spinner ── */
.spinner {
    width: 22px;
    height: 22px;
    border: 2px solid var(--border-strong);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: inline-block;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ── Skeleton ── */
.skeleton {
    background: linear-gradient(90deg, var(--skel-base) 25%, var(--skel-shine) 50%, var(--skel-base) 75%);
    background-size: 200% 100%;
    animation: skeletonShimmer 1.4s ease infinite;
    border-radius: var(--radius-sm);
}

@keyframes skeletonShimmer {
    from { background-position: 200% 0; }
    to   { background-position: -200% 0; }
}

/* ── Status / toast region (pair with aria-live="polite") ── */
.status-msg {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
}

.status-msg:empty { display: none; }
.status-success { background: var(--success-soft); color: var(--success); }
.status-error   { background: var(--danger-soft);  color: var(--danger); }
.status-info    { background: var(--accent-soft);  color: var(--accent); }