/* ============================================================
   OMR Portal - dark theme inspired by Claude's design system
   ============================================================ */

:root {
    --bg:        #262624;
    --bg-deep:   #1f1e1b;
    --surface:   #30302d;
    --surface-2: #393834;
    --border:    #45443f;
    --border-soft:#3b3a36;
    --text:      #eee9e2;
    --muted:     #a8a297;
    --accent:    #d97757;
    --accent-hover: #c4653f;
    --accent-soft: rgba(217, 119, 87, 0.14);
    --danger:    #e0635d;
    --danger-soft: rgba(224, 99, 93, 0.14);
    --success:   #82b56d;
    --success-soft: rgba(130, 181, 109, 0.15);
    --warning:   #d9a857;
    --warning-soft: rgba(217, 168, 87, 0.15);
    --radius:    12px;
    --radius-sm: 8px;
    --font: 'Inter', -apple-system, 'Segoe UI', Roboto, sans-serif;
    --font-serif: 'Lora', Georgia, serif;
}

* { box-sizing: border-box; }

html, body {
    height: 100%;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 14.5px;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5 { color: var(--text); }

a { color: var(--accent); text-decoration: none; transition: color .18s ease; }
a:hover { color: var(--accent-hover); }

code { color: var(--accent); background: var(--surface-2); padding: 1px 6px; border-radius: 6px; font-size: .85em; }

::selection { background: var(--accent-soft); }

/* ---------- brand ---------- */
.brand {
    font-family: var(--font-serif);
    font-size: 1.45rem;
    font-weight: 600;
    letter-spacing: .3px;
    color: var(--text);
}
.brand span { color: var(--accent); }

/* ---------- app shell / sidebar ---------- */
.app-shell { display: flex; min-height: 100vh; }

.sidebar {
    width: 232px;
    flex: 0 0 232px;
    background: var(--bg-deep);
    border-right: 1px solid var(--border-soft);
    display: flex;
    flex-direction: column;
    padding: 22px 14px 16px;
    position: sticky;
    top: 0;
    height: 100vh;
}
.sidebar .brand { padding: 0 10px 20px; }

.side-nav { display: flex; flex-direction: column; gap: 3px; }
.side-nav a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: var(--radius-sm);
    color: var(--muted);
    font-weight: 500;
    transition: background .18s ease, color .18s ease, transform .12s ease;
}
.side-nav a:hover { background: var(--surface); color: var(--text); }
.side-nav a.active { background: var(--accent-soft); color: var(--accent); }
.side-nav a:active { transform: scale(.985); }
.side-nav svg { flex: 0 0 auto; opacity: .9; }

.side-footer {
    margin-top: auto;
    padding-top: 14px;
    border-top: 1px solid var(--border-soft);
    display: flex;
    align-items: center;
    gap: 8px;
}
.side-user { display: flex; align-items: center; gap: 9px; min-width: 0; flex: 1; }
.avatar {
    width: 32px; height: 32px;
    flex: 0 0 32px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-weight: 600; font-size: .85rem;
}
.side-user-meta { min-width: 0; }
.side-user-email { font-size: .78rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.side-user-role { font-size: .7rem; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.logout-link {
    color: var(--muted);
    padding: 7px;
    border-radius: var(--radius-sm);
    display: flex;
    transition: background .18s ease, color .18s ease;
}
.logout-link:hover { background: var(--danger-soft); color: var(--danger); }

.main-area { flex: 1; min-width: 0; padding: 28px 34px 60px; }

/* subtle page entrance — no fill mode: a retained animation keeps a
   stacking context on .page-fade, which would trap the Bootstrap modals
   (rendered inside it) below the body-level .modal-backdrop */
.page-fade { animation: pageIn .28s ease; }
@keyframes pageIn {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: none; }
}

/* ---------- page header ---------- */
.page-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 22px;
    flex-wrap: wrap;
}
.page-head h1 { font-size: 1.45rem; font-weight: 600; margin: 0; }
.page-head .sub { color: var(--muted); font-size: .85rem; margin-top: 4px; }

.breadcrumb-lite { font-size: .82rem; color: var(--muted); margin-bottom: 6px; }
.breadcrumb-lite a { color: var(--muted); }
.breadcrumb-lite a:hover { color: var(--accent); }

/* ---------- cards ---------- */
.panel {
    background: var(--surface);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius);
    padding: 22px;
    transition: border-color .2s ease;
}
.panel + .panel { margin-top: 18px; }

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius);
    padding: 18px 20px;
    transition: transform .18s ease, border-color .18s ease;
}
.stat-card:hover { transform: translateY(-2px); border-color: var(--border); }
.stat-card .stat-label { color: var(--muted); font-size: .78rem; text-transform: uppercase; letter-spacing: .6px; }
.stat-card .stat-value { font-size: 1.9rem; font-weight: 700; margin-top: 4px; color: var(--text); }
.stat-card .stat-value.accent { color: var(--accent); }

/* ---------- auth (login / install) ---------- */
.auth-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background:
        radial-gradient(700px 360px at 80% -10%, rgba(217,119,87,.08), transparent 60%),
        var(--bg-deep);
    padding: 20px;
}
.auth-card {
    width: 100%;
    max-width: 400px;
    background: var(--surface);
    border: 1px solid var(--border-soft);
    border-radius: 16px;
    padding: 34px 32px;
    animation: pageIn .35s ease both;
}
.auth-card .brand { text-align: center; display: block; margin-bottom: 4px; }
.auth-sub { text-align: center; color: var(--muted); font-size: .85rem; margin-bottom: 24px; }

.install-line { padding: 8px 12px; border-radius: var(--radius-sm); font-size: .85rem; margin-bottom: 6px; }
.install-ok  { background: var(--success-soft); color: var(--success); }
.install-err { background: var(--danger-soft); color: var(--danger); }

/* ---------- forms ---------- */
.form-label { font-size: .82rem; font-weight: 500; color: var(--muted); margin-bottom: 6px; }

.form-control, .form-select {
    background: var(--bg-deep);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: var(--radius-sm);
    padding: 9px 12px;
    font-size: .9rem;
    transition: border-color .18s ease, box-shadow .18s ease;
}
.form-control:focus, .form-select:focus {
    background: var(--bg-deep);
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
    color: var(--text);
}
.form-control:disabled, .form-control[readonly] {
    background: var(--surface-2);
    color: var(--muted);
    opacity: 1;
}
.form-control::placeholder { color: #6f6a61; }
.form-select option { background: var(--surface); }

/* date input icon visibility on dark */
input[type="date"]::-webkit-calendar-picker-indicator { filter: invert(.75); cursor: pointer; }

/* phone prefix group */
.phone-group { display: flex; }
.phone-group .prefix {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-right: none;
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
    color: var(--muted);
    padding: 9px 12px;
    font-size: .9rem;
    font-weight: 600;
    display: flex;
    align-items: center;
}
.phone-group .form-control { border-radius: 0 var(--radius-sm) var(--radius-sm) 0; flex: 1; }

.invalid-feedback { display: none; color: var(--danger); font-size: .78rem; margin-top: 5px; }
.is-invalid ~ .invalid-feedback, .invalid-feedback.show { display: block; }
.form-control.is-invalid { border-color: var(--danger); box-shadow: none; }

.field-hint { color: var(--muted); font-size: .76rem; margin-top: 5px; }
.field-warn { color: var(--warning); font-size: .78rem; margin-top: 5px; }

/* ---------- buttons ---------- */
.btn { border-radius: var(--radius-sm); font-weight: 500; font-size: .87rem; padding: 8px 16px;
       transition: background .18s ease, transform .12s ease, box-shadow .18s ease, border-color .18s ease; }
.btn:active { transform: scale(.97); }

.btn-accent { background: var(--accent); border: 1px solid var(--accent); color: #fff; }
.btn-accent:hover, .btn-accent:focus { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }
.btn-accent:disabled { background: var(--surface-2); border-color: var(--surface-2); color: var(--muted); }

.btn-ghost { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-ghost:hover { background: var(--surface-2); border-color: var(--border); color: var(--text); }

.btn-danger { background: var(--danger-soft); border: 1px solid transparent; color: var(--danger); }
.btn-danger:hover { background: var(--danger); color: #fff; }

.btn-sm { padding: 5px 10px; font-size: .78rem; }

/* tiny icon buttons in table rows */
.btn-icon {
    width: 30px; height: 30px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 7px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--muted);
    transition: all .16s ease;
}
.btn-icon:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
.btn-icon.danger:hover { color: var(--danger); border-color: var(--danger); background: var(--danger-soft); }
.btn-icon + .btn-icon, .btn-icon + .btn, .btn + .btn-icon { margin-left: 5px; }

/* ---------- badges ---------- */
.badge-soft { padding: 4px 9px; border-radius: 20px; font-size: .72rem; font-weight: 600; }
.badge-soft.accent  { background: var(--accent-soft);  color: var(--accent); }
.badge-soft.success { background: var(--success-soft); color: var(--success); }
.badge-soft.warning { background: var(--warning-soft); color: var(--warning); }
.badge-soft.muted   { background: var(--surface-2);    color: var(--muted); }

/* ---------- tables / DataTables ---------- */
.table { --bs-table-bg: transparent; --bs-table-color: var(--text); margin-bottom: 0; }
.table > :not(caption) > * > * { border-bottom-color: var(--border-soft); padding: 11px 12px; }
.table thead th {
    color: var(--muted);
    font-size: .75rem;
    text-transform: uppercase;
    letter-spacing: .5px;
    font-weight: 600;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}
.table tbody tr { transition: background .15s ease; }
.table tbody tr:hover { background: rgba(255,255,255,.025); }

div.dataTables_wrapper div.dataTables_length select {
    background: var(--bg-deep); border: 1px solid var(--border); color: var(--text);
    border-radius: 7px; padding: 4px 26px 4px 8px;
}
div.dataTables_wrapper div.dataTables_filter input {
    background: var(--bg-deep); border: 1px solid var(--border); color: var(--text);
    border-radius: var(--radius-sm); padding: 7px 12px; width: 240px;
    transition: border-color .18s ease, box-shadow .18s ease;
    margin-left: 8px;
}
div.dataTables_wrapper div.dataTables_filter input:focus {
    outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft);
}
div.dataTables_wrapper div.dataTables_info { color: var(--muted); font-size: .8rem; padding-top: 14px; }
div.dataTables_wrapper div.dataTables_length label,
div.dataTables_wrapper div.dataTables_filter label { color: var(--muted); font-size: .82rem; }

.page-link {
    background: transparent; border-color: var(--border); color: var(--muted);
    font-size: .82rem; transition: all .16s ease;
}
.page-link:hover { background: var(--surface-2); border-color: var(--border); color: var(--text); }
.page-item.active .page-link { background: var(--accent); border-color: var(--accent); color: #fff; }
.page-item.disabled .page-link { background: transparent; border-color: var(--border-soft); color: #5d594f; }

table.dataTable thead .sorting:before, table.dataTable thead .sorting:after,
table.dataTable thead .sorting_asc:before, table.dataTable thead .sorting_asc:after,
table.dataTable thead .sorting_desc:before, table.dataTable thead .sorting_desc:after { opacity: .25; }
table.dataTable thead .sorting_asc:before, table.dataTable thead .sorting_desc:after { opacity: 1; color: var(--accent); }

/* ---------- modals ---------- */
.modal-content {
    background: var(--surface);
    border: 1px solid var(--border-soft);
    border-radius: 14px;
    color: var(--text);
}
.modal-header { border-bottom: 1px solid var(--border-soft); padding: 16px 22px; }
.modal-title { font-size: 1rem; font-weight: 600; }
.modal-body { padding: 20px 22px; }
.modal-footer { border-top: 1px solid var(--border-soft); padding: 14px 22px; }
.modal-backdrop.show { opacity: .65; }
.modal.fade .modal-dialog { transform: translateY(10px) scale(.985); transition: transform .22s ease; }
.modal.show .modal-dialog { transform: none; }
.modal-sm-plus { max-width: 420px; }

/* ---------- toasts ---------- */
.toast {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    overflow: hidden;
}
.toast .toast-body { display: flex; align-items: center; gap: 10px; font-size: .87rem; }
.toast-dot { width: 9px; height: 9px; border-radius: 50%; flex: 0 0 9px; }
.toast-success .toast-dot { background: var(--success); }
.toast-error .toast-dot { background: var(--danger); }
.toast-info  .toast-dot { background: var(--accent); }

/* ---------- OMR answer grid ---------- */
/* one single card holding every question column (like a real OMR sheet),
   sized to its content and centered on the page */
.omr-scroll { overflow-x: auto; padding-bottom: 4px; }
.omr-grid {
    display: flex;
    flex-wrap: nowrap; /* one sheet, one band; .omr-scroll handles small screens */
    width: fit-content;
    margin: 0 auto;
    background: var(--bg-deep);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius);
    padding: 18px 8px;
    gap: 0;
}
.omr-col {
    flex: 0 0 auto;
    padding: 0 30px;
}
.omr-col + .omr-col { border-left: 1px solid var(--border-soft); }

/* roomier sheet on large screens */
@media (min-width: 1400px) {
    .omr-grid { padding: 32px 16px; }
    .omr-col { padding: 0 44px; }
    .omr-grid.compact { padding: 26px 10px; }
    .omr-grid.compact .omr-col { padding: 0 26px; }
}
@media (min-width: 1800px) {
    .omr-grid { padding: 42px 22px; }
    .omr-col { padding: 0 62px; }
    .omr-grid.compact { padding: 34px 14px; }
    .omr-grid.compact .omr-col { padding: 0 38px; }
}
.omr-row {
    display: flex;
    align-items: center;
    gap: 9px;
    padding: 5px 4px;
    border-radius: 7px;
    transition: background .15s ease;
}
.omr-row:hover { background: rgba(255,255,255,.03); }
.omr-qno {
    width: 30px;
    flex: 0 0 30px;
    text-align: right;
    color: var(--muted);
    font-size: .8rem;
    font-variant-numeric: tabular-nums;
    font-weight: 600;
}
.omr-row.answered .omr-qno { color: var(--accent); }

.bubble { position: relative; cursor: pointer; margin: 0; display: inline-flex; }
.bubble input { position: absolute; opacity: 0; pointer-events: none; }
.bubble span {
    width: 27px; height: 27px;
    border: 1.5px solid var(--border);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: .72rem;
    font-weight: 600;
    color: var(--muted);
    transition: all .15s ease;
    user-select: none;
}
.bubble:hover span { border-color: var(--accent); color: var(--accent); transform: scale(1.08); }
.bubble input:checked + span {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    transform: scale(1.05);
    box-shadow: 0 0 0 3px var(--accent-soft);
}
.bubble input:focus-visible + span { box-shadow: 0 0 0 3px var(--accent-soft); }

/* compact density for 100-question sheets: 5 columns fit side by side */
.omr-grid.compact { padding: 14px 4px; }
.omr-grid.compact .omr-col { padding: 0 17px; }
.omr-grid.compact .omr-row { gap: 6px; padding: 4px 2px; }
.omr-grid.compact .omr-qno { width: 27px; flex: 0 0 27px; font-size: .74rem; }
.omr-grid.compact .bubble span { width: 24px; height: 24px; font-size: .67rem; }

.answers-toolbar {
    position: sticky;
    bottom: 0;
    width: fit-content;
    min-width: 460px;
    max-width: 100%;
    margin: 20px auto 0;
    background: var(--surface);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius);
    padding: 13px 22px;
    display: flex;
    align-items: center;
    gap: 28px;
    box-shadow: 0 -8px 24px rgba(0,0,0,.25);
}
.answers-count { color: var(--muted); font-size: .85rem; }
.answers-count b { color: var(--accent); }

/* ---------- step flow (add student) ---------- */
.step-panel { max-width: 560px; margin-left: auto; margin-right: auto; }
.step-head { max-width: 560px; margin-left: auto; margin-right: auto; }
.slide-reveal { overflow: hidden; }

.upload-zone {
    border: 1.5px dashed var(--border);
    border-radius: var(--radius);
    padding: 26px;
    text-align: center;
    color: var(--muted);
    cursor: pointer;
    transition: border-color .2s ease, background .2s ease;
}
.upload-zone:hover, .upload-zone.dragover { border-color: var(--accent); background: var(--accent-soft); color: var(--text); }
.upload-zone .file-name { color: var(--accent); font-weight: 600; }

/* ---------- misc ---------- */
.text-muted-2 { color: var(--muted) !important; }
.divider { border-top: 1px solid var(--border-soft); margin: 18px 0; }
.spin { animation: spin 1s linear infinite; display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

.empty-state { text-align: center; color: var(--muted); padding: 36px 10px; font-size: .9rem; }

@media (max-width: 860px) {
    .app-shell { flex-direction: column; }
    .sidebar { width: 100%; flex: none; height: auto; position: static; flex-direction: row; align-items: center; gap: 12px; flex-wrap: wrap; padding: 12px 14px; }
    .sidebar .brand { padding: 0 8px 0 0; }
    .side-nav { flex-direction: row; flex-wrap: wrap; }
    .side-footer { margin: 0 0 0 auto; border: 0; padding: 0; }
    .side-user-meta { display: none; }
    .main-area { padding: 20px 16px 50px; }
}