/*
 * Opin shared UI kit. Used by the submit form, login, teacher portal and share pages.
 * Everything lives under .opin-ui (or on elements that carry it) so it works with any theme.
 */
:root {
    --opin-orange: #F26C3F;
    --opin-orange-strong: #C2410C; /* white text on this passes AA (5.2:1); --opin-orange does not */
    --opin-orange-dark: #A44738;
    --opin-peach: #FEF0EC;
    --opin-navy: #354D73;
    --opin-text: #111827;
    --opin-muted: #566275; /* >= 4.5:1 on white, --opin-bg and --opin-peach */
    --opin-border: #E8E5E5;
    --opin-surface: #FFFFFF;
    --opin-bg: #F6F7F9;
    --opin-danger: #B42318;
    --opin-danger-bg: #FEF3F2;
    --opin-success: #067647;
    --opin-success-bg: #ECFDF3;
    --opin-info-bg: #EEF3FA;
    --opin-radius: 16px;
    --opin-radius-sm: 10px;
    --opin-shadow: 0 1px 2px rgba(17, 24, 39, 0.04), 0 8px 24px rgba(17, 24, 39, 0.06);
    --opin-focus: 0 0 0 3px #fff, 0 0 0 5px var(--opin-navy);
    --opin-font: "Figtree", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

.opin-ui,
.opin-ui *,
.opin-ui *::before,
.opin-ui *::after {
    box-sizing: border-box;
}

.opin-ui {
    font-family: var(--opin-font);
    font-size: 16px;
    line-height: 1.55;
    color: var(--opin-text);
    -webkit-font-smoothing: antialiased;
}

.opin-ui.opin-ui h1, .opin-ui.opin-ui h2, .opin-ui.opin-ui h3, .opin-ui.opin-ui p, .opin-ui.opin-ui ul, .opin-ui.opin-ui ol {
    margin: 0;
    padding: 0;
    font-family: inherit;
}
.opin-ui.opin-ui ul, .opin-ui.opin-ui ol { list-style: none; }

.opin-sr {
    position: absolute;
    width: 1px; height: 1px;
    margin: -1px; padding: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

.opin-kicker {
    color: var(--opin-orange-dark);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

/* Focus: always visible for keyboard users */
.opin-ui a:focus-visible,
.opin-ui button:focus-visible,
.opin-ui input:focus-visible,
.opin-ui textarea:focus-visible,
.opin-ui select:focus-visible,
.opin-ui [tabindex]:focus-visible,
.opin-modal button:focus-visible {
    outline: none;
    box-shadow: var(--opin-focus);
}

/* ---------- Buttons ---------- */
.opin-ui .opin-btn,
.opin-modal .opin-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 46px;
    padding: 0 22px;
    border: 1.5px solid transparent;
    border-radius: var(--opin-radius-sm);
    font-family: var(--opin-font);
    font-size: 16px;
    font-weight: 700;
    line-height: 1.2;
    text-decoration: none;
    text-transform: none;
    letter-spacing: 0;
    cursor: pointer;
    transition: background-color .15s ease, border-color .15s ease, color .15s ease, transform .15s ease, box-shadow .15s ease;
    -webkit-appearance: none;
    appearance: none;
}
.opin-ui .opin-btn--primary, .opin-modal .opin-btn--primary { background: var(--opin-orange-strong); color: #fff; box-shadow: 0 8px 18px rgba(194, 65, 12, 0.22); }
.opin-ui .opin-btn--primary:hover, .opin-modal .opin-btn--primary:hover { background: var(--opin-orange-dark); color: #fff; transform: translateY(-1px); }
.opin-ui .opin-btn--secondary, .opin-modal .opin-btn--secondary { background: var(--opin-surface); color: var(--opin-navy); border-color: #C9D2E0; }
.opin-ui .opin-btn--secondary:hover, .opin-modal .opin-btn--secondary:hover { background: var(--opin-bg); border-color: var(--opin-navy); color: var(--opin-navy); }
.opin-ui .opin-btn--ghost, .opin-modal .opin-btn--ghost { background: transparent; color: var(--opin-navy); }
.opin-ui .opin-btn--ghost:hover, .opin-modal .opin-btn--ghost:hover { background: var(--opin-info-bg); color: var(--opin-navy); }
.opin-ui .opin-btn--danger, .opin-modal .opin-btn--danger { background: var(--opin-danger); color: #fff; }
.opin-ui .opin-btn--danger:hover, .opin-modal .opin-btn--danger:hover { background: #912018; color: #fff; }
.opin-ui .opin-btn--lg, .opin-modal .opin-btn--lg { min-height: 52px; padding: 0 30px; font-size: 17px; }
.opin-ui .opin-btn--block, .opin-modal .opin-btn--block { display: flex; width: 100%; }
.opin-ui .opin-btn[disabled], .opin-ui .opin-btn.is-loading { cursor: not-allowed; opacity: .75; transform: none; }
.opin-btn__loading { display: none; align-items: center; gap: 10px; }
.opin-btn.is-loading .opin-btn__label { display: none; }
.opin-btn.is-loading .opin-btn__loading { display: inline-flex; }
.opin-spinner {
    width: 18px; height: 18px;
    border: 2.5px solid rgba(255, 255, 255, .45);
    border-top-color: #fff;
    border-radius: 50%;
    animation: opin-spin .7s linear infinite;
}
@keyframes opin-spin { to { transform: rotate(360deg); } }

/* ---------- Fields ---------- */
.opin-field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.opin-label { font-size: 15px; font-weight: 700; color: var(--opin-text); line-height: 1.35; }
.opin-req { color: var(--opin-danger); font-weight: 800; }
.opin-help { font-size: 14px; color: var(--opin-muted); line-height: 1.45; }
.opin-error-text { font-size: 14px; font-weight: 600; color: var(--opin-danger); line-height: 1.45; }
.opin-error-text[hidden] { display: none; }
.opin-error-text:not([hidden])::before { content: "\26A0\FE0E\00a0"; }

.opin-ui .opin-input,
.opin-ui .opin-textarea,
.opin-ui .opin-select {
    display: block;
    width: 100%;
    min-height: 48px;
    margin: 0;
    padding: 11px 14px;
    background: var(--opin-surface);
    color: var(--opin-text);
    border: 1.5px solid #CBD2DC;
    border-radius: var(--opin-radius-sm);
    font-family: var(--opin-font);
    font-size: 16px; /* 16px stops iOS zoom on focus */
    line-height: 1.45;
    box-shadow: none;
    transition: border-color .15s ease, box-shadow .15s ease;
    -webkit-appearance: none;
    appearance: none;
}
.opin-ui .opin-textarea { min-height: 120px; resize: vertical; }
.opin-ui .opin-select {
    padding-right: 40px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='none' stroke='%2364748B' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m3 6 5 5 5-5'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
}
.opin-ui .opin-input::placeholder,
.opin-ui .opin-textarea::placeholder { color: #5F6B7C; opacity: 1; }
.opin-ui .opin-input:hover,
.opin-ui .opin-textarea:hover,
.opin-ui .opin-select:hover { border-color: #94A3B8; }
.opin-ui .opin-input:focus,
.opin-ui .opin-textarea:focus,
.opin-ui .opin-select:focus {
    outline: none;
    border-color: var(--opin-navy);
    box-shadow: 0 0 0 4px rgba(53, 77, 115, .18);
}
.opin-ui .opin-input[aria-invalid="true"],
.opin-ui .opin-textarea[aria-invalid="true"],
.opin-ui .opin-select[aria-invalid="true"] {
    border-color: var(--opin-danger);
    background-color: var(--opin-danger-bg);
}
.opin-ui .opin-input[aria-invalid="true"]:focus,
.opin-ui .opin-textarea[aria-invalid="true"]:focus { box-shadow: 0 0 0 4px rgba(180, 35, 24, .18); }

.opin-counter { align-self: flex-end; font-size: 13px; color: var(--opin-muted); font-variant-numeric: tabular-nums; }
.opin-counter[hidden] { display: none; }
.opin-counter.is-near { color: var(--opin-orange-dark); font-weight: 700; }
.opin-counter.is-over { color: var(--opin-danger); font-weight: 700; }

/* Password field with toggle */
.opin-input-wrap { position: relative; }
.opin-input-wrap .opin-input { padding-right: 52px; }
.opin-input-toggle {
    position: absolute; top: 50%; right: 4px; transform: translateY(-50%);
    width: 44px; height: 44px; display: inline-flex; align-items: center; justify-content: center;
    border: 0; background: transparent; color: var(--opin-muted); cursor: pointer; border-radius: var(--opin-radius-sm);
}
.opin-input-toggle:hover { color: var(--opin-navy); }

/* Checkbox */
.opin-ui .opin-check { position: relative; display: flex; align-items: flex-start; gap: 14px; padding: 14px 16px; min-height: 48px; background: var(--opin-bg); border: 1.5px solid transparent; border-radius: var(--opin-radius-sm); cursor: pointer; font-weight: 500; }
.opin-check input { position: absolute; opacity: 0; width: 24px; height: 24px; margin: 0; left: 16px; top: 14px; cursor: pointer; }
.opin-check__box { flex: 0 0 24px; width: 24px; height: 24px; margin-top: 1px; border: 2px solid #94A3B8; border-radius: 7px; background: #fff; display: inline-flex; align-items: center; justify-content: center; transition: background-color .15s ease, border-color .15s ease; }
.opin-check__box::after { content: ""; width: 6px; height: 11px; border: solid #fff; border-width: 0 2.5px 2.5px 0; transform: rotate(45deg) scale(0); margin-top: -2px; transition: transform .12s ease; }
.opin-check input:checked + .opin-check__box { background: var(--opin-orange-strong); border-color: var(--opin-orange-strong); }
.opin-check input:checked + .opin-check__box::after { transform: rotate(45deg) scale(1); }
.opin-check input:focus-visible + .opin-check__box { box-shadow: var(--opin-focus); }
.opin-check input[aria-invalid="true"] + .opin-check__box { border-color: var(--opin-danger); }
.opin-field.has-error .opin-check { border-color: var(--opin-danger); background: var(--opin-danger-bg); }
.opin-check__text { font-size: 15.5px; line-height: 1.5; }

/* Plain checkbox row (no tinted box), for compact forms such as login */
.opin-ui .opin-check--plain { padding: 0; background: transparent; min-height: 44px; align-items: center; gap: 10px; border: 0; }
.opin-check--plain input { left: 0; top: 50%; margin-top: -12px; }

/* Text link */
.opin-ui .opin-link { color: var(--opin-navy); font-weight: 700; text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1.5px; display: inline-flex; align-items: center; min-height: 44px; }
.opin-ui .opin-link:hover { color: var(--opin-orange-dark); }

/* Password toggle shows one icon at a time (ui.js sets aria-pressed) */
.opin-input-toggle svg { width: 22px; height: 22px; flex: 0 0 22px; }
.opin-input-toggle .opin-icon-hide { display: none; }
.opin-input-toggle[aria-pressed="true"] .opin-icon-hide { display: block; }
.opin-input-toggle[aria-pressed="true"] .opin-icon-show { display: none; }

/* File inputs: native control kept for keyboard and screen readers, styled through its label */
.opin-file-input { position: absolute; width: 1px; height: 1px; opacity: 0; overflow: hidden; }
.opin-file-input:focus-visible + label { box-shadow: var(--opin-focus); }

/* Drop zone */
.opin-drop {
    position: relative;
    display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
    min-height: 168px; padding: 28px 20px; text-align: center;
    background: var(--opin-bg); color: var(--opin-navy);
    border: 2px dashed #B3BFD1; border-radius: var(--opin-radius);
    transition: background-color .15s ease, border-color .15s ease;
}
.opin-drop:hover, .opin-drop.is-dragover { background: var(--opin-peach); border-color: var(--opin-orange); }
.opin-drop:focus-within { box-shadow: var(--opin-focus); border-color: var(--opin-navy); }
.opin-drop.is-full { opacity: .6; }
.opin-drop__input { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; cursor: pointer; font-size: 0; }
.opin-drop__icon { display: inline-flex; width: 56px; height: 56px; align-items: center; justify-content: center; background: #fff; border-radius: 50%; color: var(--opin-orange-dark); box-shadow: 0 2px 8px rgba(17, 24, 39, .08); margin-bottom: 6px; }
.opin-drop__title { font-size: 17px; font-weight: 800; color: var(--opin-text); }
.opin-drop__sub { font-size: 15px; color: var(--opin-muted); }
.opin-drop__link { color: var(--opin-orange-dark); font-weight: 700; text-decoration: underline; text-underline-offset: 3px; }
.opin-drop__count { font-size: 14px; font-weight: 700; color: var(--opin-navy); font-variant-numeric: tabular-nums; }
.opin-drop__count[hidden] { display: none; }

.opin-previews { display: grid; grid-template-columns: repeat(auto-fill, minmax(104px, 1fr)); gap: 12px; }
.opin-previews:empty { display: none; }
.opin-preview { position: relative; aspect-ratio: 1; border-radius: var(--opin-radius-sm); overflow: hidden; background: var(--opin-bg); border: 1px solid var(--opin-border); }
.opin-preview img { width: 100%; height: 100%; object-fit: cover; display: block; }
.opin-preview__remove {
    position: absolute; top: 4px; right: 4px; width: 44px; height: 44px; display: inline-flex; align-items: center; justify-content: center;
    background: transparent; border: 0; cursor: pointer; padding: 0;
}
.opin-preview__remove > span { width: 28px; height: 28px; display: inline-flex; align-items: center; justify-content: center; border-radius: 50%; background: rgba(17, 24, 39, .78); color: #fff; font-size: 18px; line-height: 1; transition: background-color .15s ease; }
.opin-preview__remove:hover > span { background: var(--opin-danger); }

/* File chip */
.opin-chip { display: inline-flex; align-items: center; gap: 10px; max-width: 100%; min-height: 52px; padding: 4px 4px 4px 14px; background: var(--opin-info-bg); border: 1px solid #D5DEEC; border-radius: 999px; color: var(--opin-navy); }
.opin-chip[hidden] { display: none; }
.opin-chip__icon { display: inline-flex; color: var(--opin-orange-dark); }
.opin-chip__name { font-weight: 700; font-size: 15px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.opin-chip__size { font-size: 13px; color: var(--opin-muted); white-space: nowrap; }
.opin-chip__remove { width: 44px; height: 44px; flex: 0 0 44px; border: 0; border-radius: 50%; background: transparent; color: var(--opin-navy); font-size: 22px; line-height: 1; cursor: pointer; }
.opin-chip__remove:hover { background: rgba(53, 77, 115, .12); }

/* ---------- Surfaces ---------- */
.opin-card { background: var(--opin-surface); border: 1px solid var(--opin-border); border-radius: var(--opin-radius); box-shadow: var(--opin-shadow); padding: 24px; }

.opin-alert { display: block; padding: 14px 16px; border-radius: var(--opin-radius-sm); border: 1px solid; font-size: 15px; line-height: 1.5; }
.opin-alert__title { font-weight: 800; }
.opin-alert__list { padding-top: 6px; }
.opin-alert__list li { padding: 2px 0; }
.opin-alert a { color: inherit; font-weight: 700; text-decoration: underline; text-underline-offset: 3px; }
.opin-alert--info { background: var(--opin-info-bg); border-color: #D5DEEC; color: var(--opin-navy); }
.opin-alert--success { background: var(--opin-success-bg); border-color: #ABEFC6; color: var(--opin-success); }
.opin-alert--error { background: var(--opin-danger-bg); border-color: #FDA29B; color: var(--opin-danger); }
.opin-alert:focus { outline: none; box-shadow: var(--opin-focus); }

.opin-badge { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 999px; font-size: 13px; font-weight: 700; line-height: 1.5; background: var(--opin-info-bg); color: var(--opin-navy); }
.opin-badge--new { background: var(--opin-peach); color: var(--opin-orange-dark); }
.opin-badge--success { background: var(--opin-success-bg); color: var(--opin-success); }
.opin-badge--danger { background: var(--opin-danger-bg); color: var(--opin-danger); }

/* Table */
.opin-table-wrap { overflow-x: auto; border: 1px solid var(--opin-border); border-radius: var(--opin-radius); background: var(--opin-surface); }
.opin-ui .opin-table { width: 100%; border-collapse: collapse; font-size: 15px; }
.opin-ui .opin-table th { text-align: left; padding: 12px 16px; background: var(--opin-bg); color: var(--opin-muted); font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; border-bottom: 1px solid var(--opin-border); white-space: nowrap; }
.opin-ui .opin-table td { padding: 14px 16px; border-bottom: 1px solid var(--opin-border); vertical-align: middle; }
.opin-ui .opin-table tr:last-child td { border-bottom: 0; }
.opin-ui .opin-table tbody tr:hover td { background: #FBFBFC; }

/* Tabs */
.opin-tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--opin-border); overflow-x: auto; }
.opin-ui .opin-tab { display: inline-flex; align-items: center; gap: 8px; min-height: 46px; padding: 0 16px; color: var(--opin-muted); font-weight: 700; text-decoration: none; border-bottom: 3px solid transparent; margin-bottom: -1px; white-space: nowrap; background: none; border-top: 0; border-left: 0; border-right: 0; cursor: pointer; font-family: inherit; font-size: 15px; }
.opin-ui .opin-tab:hover { color: var(--opin-navy); }
.opin-ui .opin-tab[aria-current], .opin-ui .opin-tab[aria-selected="true"] { color: var(--opin-navy); border-bottom-color: var(--opin-orange); }

/* Stat card */
.opin-stat { background: var(--opin-surface); border: 1px solid var(--opin-border); border-radius: var(--opin-radius); padding: 20px; box-shadow: var(--opin-shadow); }
.opin-stat__value { font-size: 34px; font-weight: 800; line-height: 1.1; color: var(--opin-navy); font-variant-numeric: tabular-nums; }
.opin-stat__label { padding-top: 4px; font-size: 14px; font-weight: 600; color: var(--opin-muted); }

/* Empty state */
.opin-empty { text-align: center; padding: 48px 24px; color: var(--opin-muted); background: var(--opin-surface); border: 1.5px dashed var(--opin-border); border-radius: var(--opin-radius); }
.opin-empty__title { font-size: 18px; font-weight: 800; color: var(--opin-text); padding-bottom: 4px; }

/* Toast */
.opin-toasts { position: fixed; z-index: 100000; left: 16px; right: 16px; bottom: 16px; display: flex; flex-direction: column; align-items: center; gap: 8px; pointer-events: none; }
.opin-toast { pointer-events: auto; max-width: 420px; width: 100%; padding: 12px 16px; border-radius: var(--opin-radius-sm); background: var(--opin-text); color: #fff; font-family: var(--opin-font); font-size: 15px; font-weight: 600; box-shadow: 0 12px 32px rgba(17, 24, 39, .3); }
.opin-toast--success { background: var(--opin-success); }
.opin-toast--error { background: var(--opin-danger); }
@keyframes opin-toast-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* Modal / confirm (native <dialog>) */
.opin-modal { width: min(440px, calc(100vw - 32px)); padding: 0; border: 0; border-radius: var(--opin-radius); box-shadow: 0 24px 64px rgba(17, 24, 39, .35); color: var(--opin-text); font-family: var(--opin-font); }
.opin-modal::backdrop { background: rgba(17, 24, 39, .55); }
.opin-modal__body { padding: 24px; }
.opin-modal__title { margin: 0 0 6px; font-size: 20px; font-weight: 800; }
.opin-modal__text { margin: 0; color: var(--opin-muted); font-size: 16px; line-height: 1.5; }
.opin-modal__actions { display: flex; justify-content: flex-end; flex-wrap: wrap; gap: 10px; padding: 0 24px 24px; }

@media (prefers-reduced-motion: reduce) {
    .opin-ui.opin-ui *, .opin-modal, .opin-toast { animation: none; transition: none; }
}

.opin-ui [hidden][hidden], .opin-modal [hidden][hidden] { display: none; }

/* ---------- Micro-interactions: motion only for people who allow it ---------- */
@media (prefers-reduced-motion: no-preference) {
    .opin-ui .opin-btn:active:not([disabled]) { transform: scale(.98); }
    .opin-ui .opin-link,
    .opin-ui .opin-alert a { transition: color .15s ease-out, text-decoration-color .15s ease-out; }
    .opin-ui .opin-badge,
    .opin-ui .opin-chip { transition: background-color .15s ease-out, color .15s ease-out; }
    .opin-ui .opin-badge:hover { filter: brightness(.97); }
    .opin-ui .opin-card--lift { transition: transform .18s ease-out, box-shadow .18s ease-out; }
    .opin-ui .opin-card--lift:hover,
    .opin-ui .opin-card--lift:focus-within { transform: translateY(-3px); box-shadow: 0 2px 4px rgba(17, 24, 39, .05), 0 16px 32px rgba(53, 77, 115, .14); }
    .opin-ui .opin-check, .opin-ui .opin-tab { transition: background-color .15s ease-out, border-color .15s ease-out, color .15s ease-out; }
    .opin-toast { animation: opin-toast-in .2s ease-out; }
    .opin-modal[open] { animation: opin-modal-in .18s ease-out; }
    @keyframes opin-modal-in { from { opacity: 0; transform: translateY(8px) scale(.98); } to { opacity: 1; transform: none; } }
}
/* No motion at all when the visitor asks for less of it. */
@media (prefers-reduced-motion: reduce) {
    .opin-ui *, .opin-ui *::before, .opin-ui *::after,
    .opin-modal, .opin-modal *, .opin-toast, .opin-toasts * { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}