.app-shell {
    display: grid;
    grid-template-columns: var(--sidebar-w) 1fr;
    height: 100vh;
    height: 100dvh; /* viewport dinâmico: corrige o cálculo em notebooks/navegadores com barra de endereço retrátil */
    overflow: hidden; /* a própria grade nunca cresce além da tela; cada painel rola por conta própria (ver .sidebar e .content) */
}

/* Sidebar */
.sidebar {
    background: #000000;
    color: #cbd5d3;
    display: flex;
    flex-direction: column;
    padding: 22px 16px;
    height: 100%;
    min-height: 0; /* permite que a sidebar encolha e role internamente, em vez de esticar a grade */
    overflow-y: auto; /* rolagem independente: o mouse sobre a sidebar só move a sidebar */
    border-right: 1px solid #111;
}
.sidebar .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 4px 8px 22px;
}
.sidebar .brand img {
    max-width: 100%;
    height: auto;
}
.sidebar nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 6px;
    flex: 1;
}
.sidebar-user {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px;
    margin-bottom: 10px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid #1f2322;
}
.sidebar-user .avatar {
    flex-shrink: 0;
}
.sidebar-user-meta {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.sidebar-user-name {
    font-size: 13.5px;
    font-weight: 700;
    color: #fff;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.sidebar-user-email {
    font-size: 11.5px;
    color: #8a9694;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.sidebar-user-chip {
    margin-top: 2px;
    width: fit-content;
}
.sidebar-user-turmas {
    font-size: 11px;
    color: #8a9694;
    margin-top: 2px;
}
.sidebar .nav-section {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #5b6160;
    margin: 14px 12px 6px;
}
.sidebar .nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 14px;
    border-radius: 12px;
    color: #cbd5d3;
    font-weight: 500;
    font-size: 14px;
    position: relative;
    transition:
        background var(--dur-fast) var(--ease),
        color var(--dur-fast) var(--ease),
        transform var(--dur-fast) var(--ease);
}
.sidebar .nav-item i {
    font-size: 18px;
    color: #8a9694;
    transition: color var(--dur-fast) var(--ease);
}
.sidebar .nav-item:hover {
    background: var(--sidebar-hover);
    color: #fff;
}
.sidebar .nav-item:hover i {
    color: #fff;
}
.sidebar .nav-item.active {
    background: var(--green-500);
    color: #fff;
    box-shadow: 0 8px 20px rgba(16, 185, 129, 0.3);
}
.sidebar .nav-item.active i {
    color: #fff;
}
.sidebar .nav-bottom {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-top: 12px;
    border-top: 1px solid #1f2322;
}

/* Main */
.main {
    display: flex;
    flex-direction: column;
    min-width: 0;
    height: 100%;
    min-height: 0; /* permite que .content (abaixo) role internamente, em vez de esticar .main */
    overflow: hidden; /* .main em si não rola; quem rola é .content */
}
.topbar {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 18px 28px;
    position: sticky;
    top: 0;
    z-index: 10;
    flex-shrink: 0; /* nunca é comprimida, agora que .main tem altura fixa */
    background: rgba(246, 248, 247, 0.85);
    backdrop-filter: blur(10px);
}
.topbar .right {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-left: auto;
}
.icon-btn {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #fff;
    border: 1px solid var(--border);
    color: var(--text-muted);
    transition: all var(--dur) var(--ease);
    position: relative;
}
.icon-btn:hover {
    color: var(--green-700);
    border-color: var(--green-300);
}
.icon-btn .dot {
    position: absolute;
    top: 8px;
    right: 10px;
    width: 8px;
    height: 8px;
    background: var(--green-500);
    border-radius: 50%;
    border: 2px solid #fff;
    animation: pulseRing 1.8s var(--ease) infinite;
}

.content {
    padding: 8px 28px 32px;
    flex: 1;
    overflow-y: auto; /* rolagem independente: o mouse sobre o conteúdo só move o conteúdo, nunca a sidebar */
    min-height: 0; /* necessário para que um filho flex role internamente em vez de crescer sem limite */
}
.page-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
    flex-wrap: wrap;
}
.page-head h1 {
    font-size: 28px;
}
.filters-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
}
.exports {
    display: flex;
    gap: 10px;
    margin-left: auto;
    margin-top: -12px;
}

/* Dashboard grids */
.dash-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    margin-top: 18px;
}
.chart-card {
    padding: 20px;
}
.chart-card .chart-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 14px;
}
.chart-card h3 {
    font-size: 16px;
}
.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 12px;
    font-size: 12.5px;
    color: var(--text-muted);
}
.legend span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.legend i {
    width: 10px;
    height: 10px;
    border-radius: 3px;
    display: inline-block;
}

.chart-box {
    position: relative;
    height: 260px;
}
.chart-box.pie {
    display: flex;
    align-items: center;
    justify-content: center;
}

/* User card on topbar */
.user-pill {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 4px 12px 4px 4px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
}
.user-pill .avatar {
    width: 34px;
    height: 34px;
    font-size: 13px;
}
.user-pill .name {
    font-weight: 600;
    font-size: 13px;
}

/* Profile */
.profile-grid {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 20px;
}
.profile-side {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 30px;
    text-align: center;
}
.profile-side .avatar-lg {
    background: linear-gradient(135deg, var(--green-300), var(--green-500));
    color: #fff;
    margin-bottom: 14px;
}
.profile-side h3 {
    font-size: 18px;
}
.profile-side p {
    color: var(--text-muted);
    font-size: 13px;
}

/* Forms grid */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}