:root {
    --bg: #f5f7fb;
    --surface: #ffffff;
    --surface-soft: #f8fafc;
    --text: #162033;
    --muted: #667085;
    --border: #e4e7ec;
    --primary: #2457d6;
    --primary-dark: #173d9b;
    --success: #157f3d;
    --success-bg: #eaf8ef;
    --warning: #b54708;
    --warning-bg: #fff4e5;
    --danger: #b42318;
    --danger-bg: #fff0ee;
    --shadow: 0 16px 45px rgba(31, 42, 68, .08);
}

* { box-sizing: border-box; }

html { background: var(--bg); }

body {
    margin: 0;
    min-height: 100vh;
    color: var(--text);
    background: var(--bg);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button, input { font: inherit; }

.container {
    width: min(1120px, calc(100% - 32px));
    margin-inline: auto;
}

.topbar {
    background: #183b8f;
    color: #fff;
    position: sticky;
    top: 0;
    z-index: 10;
    box-shadow: 0 6px 22px rgba(23, 61, 155, .15);
}

.topbar-inner {
    min-height: 76px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.topbar strong { font-size: 1.1rem; }

.eyebrow {
    margin: 0 0 6px;
    color: #47617d;
    font-size: .72rem;
    font-weight: 800;
    letter-spacing: .09em;
}

.eyebrow.light { color: #bfcef1; }

.btn-ghost,
.btn-primary {
    border: 0;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 800;
    transition: transform .15s ease, opacity .15s ease, background .15s ease;
}

.btn-ghost {
    padding: 10px 16px;
    color: #fff;
    background: rgba(255, 255, 255, .12);
}

.btn-primary {
    width: 100%;
    padding: 14px 20px;
    color: #fff;
    background: var(--primary);
}

.btn-ghost:hover,
.btn-primary:hover { transform: translateY(-1px); }

.btn-primary:hover { background: var(--primary-dark); }

.page-content { padding-block: 32px 56px; }

.welcome-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 28px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 22px;
    box-shadow: var(--shadow);
}

.welcome-card h1 {
    margin: 0;
    font-size: clamp(1.55rem, 3vw, 2.25rem);
    line-height: 1.15;
}

.student-code {
    margin: 10px 0 0;
    color: var(--muted);
}

.secure-badge {
    flex: 0 0 auto;
    padding: 9px 13px;
    color: var(--success);
    background: var(--success-bg);
    border-radius: 999px;
    font-size: .82rem;
    font-weight: 800;
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    margin: 18px 0 28px;
}

.summary-card {
    padding: 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
}

.summary-card span {
    display: block;
    margin-bottom: 8px;
    color: var(--muted);
    font-size: .82rem;
    font-weight: 700;
}

.summary-card strong { font-size: 1.55rem; }

.grades-list {
    display: grid;
    gap: 18px;
}

.grade-card {
    padding: 24px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 22px;
    box-shadow: 0 8px 24px rgba(31, 42, 68, .04);
}

.grade-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 18px;
}

.grade-card h2 {
    margin: 0;
    font-size: 1.18rem;
}

.status-pill {
    flex: 0 0 auto;
    padding: 8px 11px;
    border-radius: 999px;
    font-size: .76rem;
    font-weight: 900;
}

.status-pill.ok {
    color: var(--success);
    background: var(--success-bg);
}

.status-pill.warning {
    color: var(--warning);
    background: var(--warning-bg);
}

.assessment-list {
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 14px;
}

.assessment-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 12px 14px;
    background: var(--surface-soft);
    border-bottom: 1px solid var(--border);
}

.assessment-row:last-child { border-bottom: 0; }

.assessment-row span {
    color: #42526b;
    font-size: .9rem;
}

.assessment-row strong { white-space: nowrap; }

.grade-result-grid {
    display: grid;
    grid-template-columns: 2fr 2fr 1fr;
    gap: 12px;
    margin-top: 16px;
}

.grade-result-grid > div {
    padding: 14px;
    background: #f7f9fc;
    border-radius: 14px;
}

.grade-result-grid span {
    display: block;
    margin-bottom: 5px;
    color: var(--muted);
    font-size: .75rem;
    font-weight: 700;
}

.grade-result-grid strong { font-size: 1.1rem; }
.grade-result-grid small { color: var(--muted); font-size: .72rem; }

.progress-track {
    height: 8px;
    margin-top: 16px;
    overflow: hidden;
    background: #e8edf5;
    border-radius: 999px;
}

.progress-track span {
    display: block;
    height: 100%;
    background: var(--primary);
    border-radius: inherit;
}

.minimum-note {
    margin: 8px 0 0;
    color: var(--muted);
    font-size: .76rem;
}

.empty-state {
    padding: 32px;
    text-align: center;
    color: var(--muted);
    background: var(--surface);
    border: 1px dashed var(--border);
    border-radius: 18px;
}

.login-page {
    display: grid;
    place-items: center;
    min-height: 100vh;
    background:
        radial-gradient(circle at top left, rgba(36, 87, 214, .16), transparent 35%),
        var(--bg);
}

.login-shell {
    width: min(100% - 30px, 450px);
    padding-block: 30px;
}

.login-card {
    padding: 34px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 24px;
    box-shadow: var(--shadow);
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 48px;
    height: 48px;
    margin-bottom: 22px;
    color: #fff;
    background: var(--primary);
    border-radius: 15px;
    font-size: 1.25rem;
    font-weight: 900;
}

.login-card h1 {
    margin: 0;
    font-size: 2rem;
}

.login-copy {
    margin: 10px 0 24px;
    color: var(--muted);
    line-height: 1.55;
}

.login-form {
    display: grid;
    gap: 9px;
}

.login-form label {
    margin-top: 6px;
    font-size: .82rem;
    font-weight: 800;
}

.login-form input {
    width: 100%;
    padding: 13px 14px;
    color: var(--text);
    background: #fff;
    border: 1px solid #cfd6e2;
    border-radius: 12px;
    outline: none;
}

.login-form input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(36, 87, 214, .12);
}

.alert-error {
    margin: 7px 0;
    padding: 11px 12px;
    color: var(--danger);
    background: var(--danger-bg);
    border-radius: 10px;
    font-size: .84rem;
    font-weight: 700;
}

.privacy-note {
    margin: 18px 0 0;
    color: var(--muted);
    text-align: center;
    font-size: .76rem;
}

@media (max-width: 800px) {
    .summary-grid { grid-template-columns: repeat(2, 1fr); }
    .welcome-card { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 560px) {
    .container { width: min(100% - 20px, 1120px); }
    .page-content { padding-top: 20px; }
    .welcome-card, .grade-card, .login-card { padding: 20px; border-radius: 18px; }
    .summary-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
    .summary-card { padding: 15px; }
    .grade-card-header { flex-direction: column; }
    .grade-result-grid { grid-template-columns: 1fr; }
    .assessment-row { align-items: flex-start; }
}

.live-source,
.alert-sync {
    margin: -12px 0 20px;
    padding: 11px 14px;
    border-radius: 12px;
    font-size: .82rem;
    font-weight: 700;
}

.live-source {
    color: #17643b;
    background: #eaf8f0;
    border: 1px solid #c8ead6;
}

.alert-sync {
    color: #875d06;
    background: #fff7df;
    border: 1px solid #f2df9d;
}