:root {
    --niu-purple: #5b2b82;
    --niu-purple-dark: #3f1d5c;
    --niu-purple-soft: #f2edf7;
    --ink: #211a27;
    --muted: #716a78;
    --line: #e8e3eb;
    --surface: #ffffff;
    --background: #f7f6f8;
    --success: #18794e;
    --warning: #9a6700;
    --danger: #b42318;
    --radius: 20px;
    --shadow: 0 14px 34px rgba(38, 27, 46, 0.08);
}

* {
    box-sizing: border-box;
}

html {
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--background);
    color: var(--ink);
}

body {
    margin: 0;
    min-height: 100vh;
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input {
    font: inherit;
}

.topbar {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: .8rem 1rem;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    position: sticky;
    top: 0;
    z-index: 20;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: .8rem;
}

.brand-mark {
    display: inline-grid;
    place-items: center;
    min-width: 48px;
    height: 48px;
    padding: 0 .6rem;
    border-radius: 14px;
    background: var(--niu-purple);
    color: white;
    font-weight: 900;
    letter-spacing: .04em;
}

.brand-mark.large {
    width: 72px;
    height: 72px;
    border-radius: 20px;
    font-size: 1.35rem;
}

.brand strong,
.brand small {
    display: block;
}

.brand small {
    color: var(--muted);
    margin-top: .1rem;
    font-size: .72rem;
}

.user-chip {
    display: flex;
    align-items: center;
    gap: .65rem;
}

.avatar {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: var(--niu-purple-soft);
    color: var(--niu-purple);
    font-weight: 800;
}

.user-copy {
    display: none;
}

.desktop-nav {
    display: none;
}

.page-shell {
    width: min(1220px, calc(100% - 2rem));
    margin: 0 auto;
    padding: 1.25rem 0 6.5rem;
}

.hero {
    display: grid;
    gap: 1rem;
    margin-bottom: 1rem;
}

.hero h1,
.card h2,
.login-card h2 {
    margin: .2rem 0 .5rem;
    line-height: 1.08;
}

.hero h1 {
    font-size: clamp(2rem, 7vw, 3.4rem);
}

.eyebrow {
    margin: 0 0 .4rem;
    color: var(--niu-purple);
    font-size: .75rem;
    font-weight: 800;
    letter-spacing: .09em;
    text-transform: uppercase;
}

.muted {
    color: var(--muted);
}

.score-card {
    padding: 1.3rem;
    border-radius: var(--radius);
    background: linear-gradient(145deg, var(--niu-purple-dark), var(--niu-purple));
    color: white;
    box-shadow: var(--shadow);
}

.score-card span,
.score-card small {
    display: block;
    opacity: .8;
}

.score-card strong {
    display: block;
    margin: .2rem 0;
    font-size: 2.5rem;
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: .75rem;
    margin-bottom: .75rem;
}

.stat-card,
.card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.stat-card {
    padding: 1rem;
}

.stat-card span {
    display: block;
    color: var(--muted);
    font-size: .78rem;
}

.stat-card strong {
    display: block;
    margin-top: .25rem;
    font-size: 1.8rem;
}

.dashboard-grid {
    display: grid;
    gap: .75rem;
}

.card {
    padding: 1.1rem;
}

.performance-list {
    display: grid;
    gap: 1rem;
}

.performance-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: .45rem .8rem;
    align-items: center;
}

.performance-copy strong,
.performance-copy small {
    display: block;
}

.performance-copy small {
    color: var(--muted);
    margin-top: .15rem;
}

.performance-meter {
    grid-column: 1 / -1;
    height: 8px;
    overflow: hidden;
    background: var(--niu-purple-soft);
    border-radius: 999px;
}

.performance-meter span {
    display: block;
    height: 100%;
    background: var(--niu-purple);
    border-radius: inherit;
}

.performance-number {
    grid-column: 2;
    grid-row: 1;
    color: var(--niu-purple);
}

.action-number {
    display: flex;
    align-items: center;
    gap: .8rem;
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 16px;
    background: var(--niu-purple-soft);
}

.action-number strong {
    font-size: 2rem;
    color: var(--niu-purple);
}

.empty-state {
    padding: 1.25rem;
    border: 1px dashed var(--line);
    border-radius: 14px;
    color: var(--muted);
}

.mobile-nav {
    position: fixed;
    left: .75rem;
    right: .75rem;
    bottom: .75rem;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-around;
    gap: .5rem;
    padding: .5rem;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: rgba(255, 255, 255, .96);
    box-shadow: 0 12px 40px rgba(38, 27, 46, .18);
    z-index: 30;
}

.mobile-nav a {
    padding: .7rem;
    font-size: .78rem;
    font-weight: 700;
    color: var(--muted);
}

.login-body {
    background: var(--surface);
}

.login-page {
    min-height: 100vh;
    display: grid;
}

.login-brand-panel,
.login-form-panel {
    padding: 2rem 1.25rem;
}

.login-brand-panel {
    min-height: 40vh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background:
        radial-gradient(circle at 80% 20%, rgba(255,255,255,.15), transparent 25%),
        linear-gradient(145deg, var(--niu-purple-dark), var(--niu-purple));
    color: white;
}

.login-brand-panel .eyebrow {
    margin-top: 1.5rem;
    color: rgba(255,255,255,.75);
}

.login-brand-panel h1 {
    max-width: 650px;
    margin: .3rem 0 1rem;
    font-size: clamp(2.35rem, 10vw, 4.8rem);
    line-height: .95;
}

.login-intro,
.panel-note {
    max-width: 580px;
    color: rgba(255,255,255,.78);
}

.login-form-panel {
    display: grid;
    align-items: center;
}

.login-card {
    width: min(100%, 440px);
    margin: auto;
}

.login-card label {
    display: block;
    margin: 1rem 0 .4rem;
    font-size: .85rem;
    font-weight: 700;
}

.login-card input {
    width: 100%;
    min-height: 50px;
    padding: .75rem .9rem;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: white;
    outline: none;
}

.login-card input:focus {
    border-color: var(--niu-purple);
    box-shadow: 0 0 0 3px var(--niu-purple-soft);
}

.login-card button {
    width: 100%;
    min-height: 52px;
    margin-top: 1.25rem;
    border: 0;
    border-radius: 12px;
    background: var(--niu-purple);
    color: white;
    font-weight: 800;
    cursor: pointer;
}

.alert {
    margin: 1rem 0;
    padding: .8rem 1rem;
    border-radius: 12px;
}

.alert.error {
    background: #fef3f2;
    color: var(--danger);
}

@media (min-width: 760px) {
    .page-shell {
        padding-top: 2rem;
    }

    .user-copy {
        display: block;
    }

    .user-copy strong,
    .user-copy small {
        display: block;
    }

    .user-copy small {
        color: var(--muted);
        margin-top: .1rem;
    }

    .desktop-nav {
        display: flex;
        align-items: center;
        gap: .25rem;
        min-height: 48px;
        padding: 0 max(1rem, calc((100% - 1220px) / 2));
        background: var(--surface);
        border-bottom: 1px solid var(--line);
    }

    .desktop-nav a {
        padding: .75rem .9rem;
        color: var(--muted);
        font-size: .85rem;
        font-weight: 700;
        border-radius: 10px;
    }

    .desktop-nav a:hover {
        color: var(--niu-purple);
        background: var(--niu-purple-soft);
    }

    .mobile-nav {
        display: none;
    }

    .page-shell {
        padding-bottom: 2rem;
    }

    .hero {
        grid-template-columns: 1fr minmax(260px, 320px);
        align-items: end;
        margin-bottom: 1.25rem;
    }

    .stat-grid {
        grid-template-columns: repeat(4, 1fr);
        margin-bottom: 1rem;
    }

    .dashboard-grid {
        grid-template-columns: minmax(0, 2fr) minmax(280px, .8fr);
        gap: 1rem;
    }

    .card {
        padding: 1.5rem;
    }

    .login-page {
        grid-template-columns: minmax(0, 1.15fr) minmax(420px, .85fr);
    }

    .login-brand-panel,
    .login-form-panel {
        padding: clamp(2rem, 6vw, 5rem);
    }

    .login-brand-panel {
        min-height: 100vh;
    }
}