:root {
    --p1: #7B61FF;
    --p2: #5B3FE0;
    --p3: #8B5CF6;
    --grape: #4c1d95;
    --pink: #FF5C7A;
    --coral: #FF5C7A;
    --coral-deep: #e8425f;
    --gold: #FFC542;
    --mint: #22C3A6;
    --sky: #38bdf8;

    --night-1: #191026;
    --night-2: #251743;
    --night-3: #2f1d55;

    --ink: #231736;
    --ink-soft: #453a5e;
    --muted: #7a7195;
    --paper: #ffffff;
    --cream: #f6f3fe;
    --cloud: #efeafc;
    --line: #e9e3f8;
    --line-strong: #d9d0f0;

    --grad-brand: linear-gradient(135deg, #8B5CF6 0%, #7B61FF 48%, #5B3FE0 100%);
    --grad-cta: linear-gradient(135deg, #7B61FF 0%, #a855f7 55%, #FF5C7A 120%);
    --grad-night: linear-gradient(180deg, #1b1130 0%, #271849 58%, #2e1c56 100%);
    --grad-gold: linear-gradient(135deg, #FFC542, #FF9F45);

    --shadow-xs: 0 1px 3px rgba(35, 23, 54, .07);
    --shadow-sm: 0 5px 16px rgba(91, 63, 224, .10);
    --shadow: 0 12px 32px rgba(91, 63, 224, .14);
    --shadow-lg: 0 24px 60px rgba(43, 22, 92, .22);
    --shadow-violet: 0 10px 24px rgba(123, 97, 255, .35);
    --shadow-coral: 0 10px 24px rgba(255, 92, 122, .30);

    --radius-sm: 12px;
    --radius: 18px;
    --radius-lg: 26px;
    --radius-pill: 999px;

    --bs-primary: #7B61FF;
}

* { box-sizing: border-box; }

html { min-height: 100%; font-size: 16px; }

body {
    margin: 0;
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--ink);
    background: var(--cream);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 { font-weight: 800; letter-spacing: -.02em; color: var(--ink); line-height: 1.2; }

a { color: var(--p2); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--grape); }

.text-muted { color: var(--muted) !important; }
::selection { background: rgba(123, 97, 255, .22); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 99px; border: 2px solid var(--cream); }
::-webkit-scrollbar-thumb:hover { background: var(--p1); }

/* ---------- Buttons ---------- */
.btn {
    border-radius: var(--radius-pill);
    font-weight: 700;
    padding: .62rem 1.3rem;
    border: 2px solid transparent;
    transition: transform .15s ease, box-shadow .18s ease, background .18s ease, color .15s ease, filter .18s ease;
    letter-spacing: -.01em;
}
.btn:active { transform: translateY(1px) scale(.99); }
.btn:focus-visible { outline: none; box-shadow: 0 0 0 4px rgba(123, 97, 255, .25); }
.btn-primary, .btn-brand {
    background: var(--grad-brand); border: none; color: #fff;
    box-shadow: var(--shadow-violet);
}
.btn-primary:hover, .btn-brand:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 16px 34px rgba(123, 97, 255, .45); filter: brightness(1.04); }
.btn-coral { background: var(--grad-cta); color: #fff; border: none; box-shadow: var(--shadow-coral); }
.btn-coral:hover { color: #fff; transform: translateY(-2px); filter: brightness(1.05); }
.btn-outline-primary { color: var(--p2); border-color: var(--line-strong); background: #fff; }
.btn-outline-primary:hover { background: var(--p1); border-color: var(--p1); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-violet); }
.btn-dark { background: var(--night-2); border: none; color: #fff; }
.btn-dark:hover { background: var(--night-1); color: #fff; transform: translateY(-2px); }
.btn-light, .btn-outline-light { background: #fff; color: var(--ink); border-color: var(--line-strong); }
.btn-light:hover { background: var(--cloud); color: var(--ink); }
.btn-secondary { background: var(--cloud); color: var(--ink-soft); border: none; }
.btn-secondary:hover { background: var(--line-strong); color: var(--ink); }
.btn-outline-secondary { color: var(--muted); border-color: var(--line-strong); background: #fff; }
.btn-outline-secondary:hover { background: var(--cloud); color: var(--ink); border-color: var(--line-strong); }
.btn-success { background: var(--mint); border: none; color: #06382b; }
.btn-success:hover { background: #1cae93; color: #06382b; transform: translateY(-2px); }
.btn-danger { background: var(--coral-deep); border: none; }
.btn-danger:hover { background: #d03551; transform: translateY(-2px); }
.btn-outline-danger { color: var(--coral-deep); border-color: #f8ccd6; background: #fff; }
.btn-outline-danger:hover { background: var(--coral-deep); border-color: var(--coral-deep); color: #fff; }
.btn-lg { padding: .9rem 1.8rem; font-size: 1.05rem; }
.btn-sm { padding: .4rem .9rem; font-size: .85rem; border-width: 1.5px; }

/* ---------- Cards ---------- */
.card {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow-xs);
    background: #fff;
    transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
    overflow: hidden;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--line-strong); }
.card-body { padding: 1.35rem; }
.card-title { font-weight: 800; }
.shadow-sm { box-shadow: var(--shadow-sm) !important; }

.soft-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-xs);
    transition: box-shadow .2s ease, border-color .2s ease;
}
.soft-card:hover { box-shadow: var(--shadow-sm); }

/* ---------- Forms ---------- */
.form-control, .form-select {
    border: 1.5px solid var(--line-strong);
    border-radius: var(--radius-sm);
    padding: .7rem .95rem;
    background: #fff;
    color: var(--ink);
    transition: border-color .16s ease, box-shadow .16s ease;
}
.form-control:focus, .form-select:focus {
    border-color: var(--p1);
    box-shadow: 0 0 0 4px rgba(123, 97, 255, .16);
}
.form-control::placeholder { color: #b3aacb; }
.form-label { font-weight: 700; font-size: .9rem; margin-bottom: .35rem; color: var(--ink-soft); }
.form-check-input { border-color: var(--line-strong); }
.form-check-input:checked { background-color: var(--p1); border-color: var(--p1); }
.form-check-input:focus { box-shadow: 0 0 0 4px rgba(123, 97, 255, .16); }
.form-switch .form-check-input:checked { background-color: var(--mint); border-color: var(--mint); }

/* ---------- Tables ---------- */
.table { --bs-table-bg: transparent; color: var(--ink); margin-bottom: 0; }
.table thead th {
    font-size: .72rem; text-transform: uppercase; letter-spacing: .07em;
    color: var(--muted); font-weight: 800; border-bottom: 1px solid var(--line); padding: .8rem .9rem;
    background: #fbf9ff;
}
.table tbody td { padding: .85rem .9rem; vertical-align: middle; border-color: var(--line); }
.table-hover tbody tr { transition: background .14s ease; }
.table-hover tbody tr:hover { background: var(--cream); }
.table-danger, .table-danger > td { background: rgba(255, 92, 122, .08) !important; }
.table-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-xs); overflow: hidden; }

/* ---------- Badges ---------- */
.badge { font-weight: 700; border-radius: var(--radius-pill); padding: .42em .9em; font-size: .74rem; letter-spacing: .01em; }
.bg-primary { background: rgba(123, 97, 255, .14) !important; color: var(--p2) !important; }
.bg-success { background: rgba(34, 195, 166, .16) !important; color: #0c7a63 !important; }
.bg-warning { background: rgba(255, 197, 66, .22) !important; color: #8a6300 !important; }
.bg-secondary { background: var(--cloud) !important; color: var(--muted) !important; }
.bg-danger { background: rgba(232, 66, 95, .13) !important; color: var(--coral-deep) !important; }
.bg-dark { background: var(--night-2) !important; color: #fff !important; }

/* ---------- Alerts ---------- */
.alert { border: none; border-radius: var(--radius-sm); padding: .9rem 1.1rem; font-weight: 600; box-shadow: var(--shadow-xs); }
.alert-success { background: rgba(34, 195, 166, .15); color: #0c7a63; }
.alert-danger { background: rgba(232, 66, 95, .11); color: var(--coral-deep); }

/* ---------- Brand ---------- */
.brand { display: inline-flex; align-items: center; gap: .6rem; font-weight: 900; font-size: 1.18rem; letter-spacing: -.03em; color: #fff; }
.brand:hover { color: #fff; }
.brand-pandu { width: 38px; height: 38px; border-radius: 13px; object-fit: cover; box-shadow: 0 6px 18px rgba(0, 0, 0, .35); }

/* ---------- App shell ---------- */
.shell { display: grid; grid-template-columns: 264px 1fr; min-height: 100vh; }

.sidebar {
    background: var(--grad-night);
    padding: 1.5rem 1rem 1.2rem;
    position: sticky; top: 0; height: 100vh;
    display: flex; flex-direction: column;
    overflow-y: auto;
}
.sidebar::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, .18); border-color: transparent; }
.sidebar .brand { padding: .1rem .5rem 1.3rem; }

.side-section {
    font-size: .66rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase;
    color: rgba(255, 255, 255, .38);
    padding: .95rem .85rem .35rem;
}

.side-link {
    display: flex; align-items: center; gap: .7rem;
    padding: .62rem .85rem;
    border-radius: 13px;
    color: rgba(255, 255, 255, .74);
    font-weight: 700; font-size: .93rem;
    margin-bottom: .18rem;
    transition: background .18s ease, color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.side-link:hover { background: rgba(255, 255, 255, .08); color: #fff; transform: translateX(3px); }
.side-link.active { background: var(--grad-brand); color: #fff; box-shadow: 0 8px 22px rgba(123, 97, 255, .45); }
.side-link svg { width: 19px; height: 19px; stroke: currentColor; flex: none; opacity: .9; }

.side-foot { margin-top: auto; border-top: 1px solid rgba(255, 255, 255, .12); padding-top: 1rem; color: #fff; }
.side-foot .who { display: flex; align-items: center; gap: .6rem; margin-bottom: .8rem; min-width: 0; }
.side-foot .who .nm { font-weight: 800; font-size: .88rem; color: #fff; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.side-foot .who .rl { font-size: .74rem; color: rgba(255, 255, 255, .55); }
.btn-exit {
    width: 100%; background: rgba(255, 255, 255, .09); color: #fff;
    border: 1px solid rgba(255, 255, 255, .22); border-radius: var(--radius-pill);
    font-weight: 700; font-size: .88rem; padding: .5rem 1rem;
    transition: background .18s ease, transform .15s ease;
}
.btn-exit:hover { background: rgba(255, 92, 122, .85); border-color: transparent; color: #fff; transform: translateY(-1px); }

.avatar {
    width: 40px; height: 40px; border-radius: 50%;
    background: var(--grad-cta); color: #fff;
    display: grid; place-items: center; font-weight: 800; flex: none;
    box-shadow: var(--shadow-sm);
}

.shell-main { padding: 0 2rem 3rem; min-width: 0; }

.topbar-app {
    display: flex; align-items: center; justify-content: space-between; gap: 1rem;
    position: sticky; top: 0; z-index: 50;
    background: rgba(246, 243, 254, .82);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    margin: 0 -2rem 1.6rem;
    padding: .9rem 2rem;
    border-bottom: 1px solid var(--line);
}
.topbar-title { font-weight: 800; font-size: 1.02rem; color: var(--ink); }
.chip {
    display: inline-flex; align-items: center; gap: .5rem;
    background: #fff; border: 1px solid var(--line);
    border-radius: var(--radius-pill);
    padding: .3rem .8rem .3rem .3rem;
    font-weight: 700; font-size: .88rem;
    box-shadow: var(--shadow-xs);
}

/* ---------- Page header ---------- */
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 1rem; margin-bottom: 1.4rem; flex-wrap: wrap; }
.page-head h1, .page-head h2 { margin: 0; font-size: 1.65rem; }
.page-head .sub { color: var(--muted); margin-top: .25rem; font-size: .93rem; }

/* ---------- Breadcrumb ---------- */
.breadcrumb { background: transparent; padding: 0; margin-bottom: 1rem; font-weight: 700; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--p2); }
.breadcrumb .sep { color: var(--line-strong); margin: 0 .5rem; }
.breadcrumb .cur { color: var(--ink); }

/* ---------- Exam / content cards ---------- */
.exam-card {
    border: 1px solid var(--line); border-radius: var(--radius); background: #fff;
    padding: 1.4rem; transition: transform .18s ease, box-shadow .18s ease; position: relative; overflow: hidden; height: 100%;
}
.exam-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.exam-card .tag { width: 52px; height: 52px; border-radius: 15px; display: grid; place-items: center; font-weight: 900; color: #fff; font-size: 1rem; margin-bottom: .9rem; box-shadow: var(--shadow-sm); }
.exam-card-emoji { font-size: 1.9rem; }
.accent-violet .tag { background: var(--grad-brand); }
.accent-coral .tag { background: var(--grad-cta); }
.accent-sky .tag { background: linear-gradient(135deg, var(--mint), var(--sky)); }
.accent-mint .tag { background: linear-gradient(135deg, var(--mint), var(--p1)); }
.accent-sun .tag { background: var(--grad-gold); }
.gradient-text { background: var(--grad-cta); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }

/* ---------- Empty state ---------- */
.empty { text-align: center; padding: 3rem 1rem; color: var(--muted); }
.empty .emoji { font-size: 2.6rem; display: block; margin-bottom: .6rem; }

/* ---------- Upload drop zone ---------- */
.drop-zone {
    border: 2px dashed var(--line-strong); border-radius: var(--radius-sm);
    background: #fbf9ff; color: var(--muted);
    padding: 1.2rem; text-align: center; cursor: pointer; font-weight: 600;
    transition: border-color .18s ease, background .18s ease;
}
.drop-zone:hover, .drop-zone.drag { border-color: var(--p1); background: rgba(123, 97, 255, .06); color: var(--p2); }

/* ---------- Misc ---------- */
.divider { height: 1px; background: var(--line); border: none; margin: 1.4rem 0; }
.fade-up { animation: fadeUp .45s ease both; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
.shell-main > *:not(.topbar-app) { animation: fadeUp .4s ease both; }

/* ---------- Login ---------- */
.auth-body {
    min-height: 100vh;
    background: radial-gradient(90% 70% at 80% -10%, rgba(139, 92, 246, .55), transparent 55%),
                radial-gradient(70% 60% at 8% 108%, rgba(255, 92, 122, .35), transparent 55%),
                linear-gradient(160deg, #170e2b 0%, #241546 55%, #311c5e 100%);
    display: grid; place-items: center; padding: 1.5rem;
}
.auth-card {
    width: 100%; max-width: 420px;
    background: rgba(255, 255, 255, .97);
    border-radius: 28px;
    box-shadow: 0 34px 90px rgba(10, 4, 32, .55);
    padding: 2.6rem 2.3rem 2.2rem;
    text-align: center;
    animation: fadeUp .5s ease both;
}
.auth-mascot {
    width: 84px; height: 84px; border-radius: 50%;
    object-fit: cover;
    border: 4px solid #fff;
    box-shadow: 0 0 0 4px rgba(123, 97, 255, .55), 0 14px 30px rgba(123, 97, 255, .35);
    margin-top: -70px;
    background: #fff;
}
.auth-card h1 { font-size: 1.45rem; margin: 1rem 0 .2rem; }
.auth-card .hint { color: var(--muted); font-size: .92rem; margin-bottom: 1.6rem; }
.auth-card .form-control { text-align: left; padding: .85rem 1.05rem; font-size: .98rem; }
.auth-card .form-label { text-align: left; display: block; }
.auth-foot { color: rgba(255, 255, 255, .55); font-size: .8rem; margin-top: 1.4rem; text-align: center; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
    .shell { grid-template-columns: 1fr; }
    .sidebar {
        position: static; height: auto;
        flex-direction: row; align-items: center; gap: .3rem;
        overflow-x: auto; overflow-y: hidden;
        padding: .7rem .9rem;
        white-space: nowrap;
    }
    .sidebar .brand { padding: 0 .6rem 0 0; }
    .sidebar .brand .brand-txt { display: none; }
    .side-section { display: none; }
    .side-link { margin: 0 .1rem; padding: .5rem .8rem; font-size: .86rem; flex: none; }
    .side-link:hover { transform: none; }
    .side-foot { margin: 0; border: none; padding: 0 0 0 .4rem; }
    .side-foot .who { display: none; }
    .btn-exit { width: auto; padding: .42rem .9rem; font-size: .8rem; }
    .shell-main { padding: 0 1.1rem 2rem; }
    .topbar-app { margin: 0 -1.1rem 1.2rem; padding: .75rem 1.1rem; }
}