/* ============================================================
   EstudaAi - Estilo (paleta azul/cinza, responsivo)
   ============================================================ */

:root {
    --c-primary:        #1565c0;
    --c-primary-dark:   #0d47a1;
    --c-primary-light:  #e3f0fd;
    --c-secondary:      #00897b;
    --c-accent:         #f59e0b;
    --c-success:        #2e7d32;
    --c-warning:        #ed6c02;
    --c-error:          #c62828;
    --c-text:           #1f2937;
    --c-text-soft:      #4b5563;
    --c-text-muted:     #6b7280;
    --c-border:         #e5e7eb;
    --c-border-strong:  #cbd5e1;
    --c-bg:             #f7f9fc;
    --c-surface:        #ffffff;
    --c-surface-2:      #f1f5f9;
    --c-overlay:        rgba(15, 23, 42, 0.45);

    --radius-sm: 6px;
    --radius:    10px;
    --radius-lg: 16px;

    --shadow-sm: 0 1px 2px rgba(15,23,42,0.06);
    --shadow:    0 4px 12px rgba(15,23,42,0.08);
    --shadow-lg: 0 12px 32px rgba(15,23,42,0.12);

    --space: 8px;
    --maxw:  1200px;

    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    font-family: var(--font);
    color: var(--c-text);
    background: var(--c-bg);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--c-primary); text-decoration: none; }
a:hover { color: var(--c-primary-dark); }

img { max-width: 100%; display: block; }

.container {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 0 16px;
}

/* ---------- Topbar ---------- */
.topbar {
    background: var(--c-surface);
    border-bottom: 1px solid var(--c-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}
.topbar__inner {
    display: flex;
    align-items: center;
    gap: 16px;
    height: 64px;
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 20px;
    color: var(--c-primary-dark);
}
.brand:hover { color: var(--c-primary-dark); }
.brand__mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--c-primary), var(--c-primary-dark));
    color: #fff;
    font-weight: 800;
}
.brand__text b { color: var(--c-primary); font-weight: 800; }

.nav {
    display: flex;
    gap: 4px;
    margin-left: 8px;
}
.nav__link {
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    color: var(--c-text-soft);
    font-weight: 500;
    font-size: 15px;
    transition: background .15s, color .15s;
}
.nav__link:hover { background: var(--c-primary-light); color: var(--c-primary-dark); }
.nav__link.is-active { background: var(--c-primary-light); color: var(--c-primary-dark); font-weight: 600; }

.topbar__actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 8px;
}
.userbox {
    display: flex;
    align-items: center;
    gap: 10px;
}
.userbox__name { font-size: 14px; color: var(--c-text-soft); }

.nav-toggle {
    display: none;
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    cursor: pointer;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    border-radius: 8px;
}
.nav-toggle span {
    display: block;
    height: 2px;
    background: var(--c-text);
    border-radius: 2px;
    transition: transform .2s, opacity .2s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Botoes ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 9px 18px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 14px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background .15s, border-color .15s, color .15s, box-shadow .15s;
    text-decoration: none;
    line-height: 1.2;
}
.btn--primary {
    background: var(--c-primary);
    color: #fff;
}
.btn--primary:hover { background: var(--c-primary-dark); color: #fff; }
.btn--ghost {
    background: transparent;
    color: var(--c-primary-dark);
    border-color: var(--c-border-strong);
}
.btn--ghost:hover { background: var(--c-primary-light); color: var(--c-primary-dark); }
.btn--success { background: var(--c-success); color: #fff; }
.btn--success:hover { background: #1b5e20; color: #fff; }
.btn--danger  { background: var(--c-error); color: #fff; }
.btn--danger:hover  { background: #8e1d1d; color: #fff; }
.btn--block { width: 100%; }
.btn--sm { padding: 6px 12px; font-size: 13px; }
.btn--lg { padding: 12px 24px; font-size: 16px; }

/* ---------- Flash ---------- */
.flash {
    padding: 12px 16px;
    font-size: 14px;
    border-bottom: 1px solid var(--c-border);
}
.flash--info    { background: var(--c-primary-light); color: var(--c-primary-dark); }
.flash--success { background: #e7f5ec; color: #1b5e20; }

.import-loading {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: var(--c-overlay);
}
.import-loading.is-visible { display: flex; }
.import-loading__box {
    width: min(100%, 380px);
    padding: 28px;
    border-radius: var(--radius);
    background: var(--c-surface);
    box-shadow: var(--shadow-lg);
    text-align: center;
}
.import-loading__box h2 { margin: 16px 0 8px; }
.import-loading__box p { margin: 0; color: var(--c-text-soft); }
.import-loading__spinner {
    display: inline-block;
    width: 42px;
    height: 42px;
    border: 4px solid var(--c-primary-light);
    border-top-color: var(--c-primary);
    border-radius: 50%;
    animation: import-loading-spin 0.8s linear infinite;
}
@keyframes import-loading-spin {
    to { transform: rotate(360deg); }
}
.flash--error   { background: #fdeceb; color: #8e1d1d; }

/* ---------- Main / Sections ---------- */
.main { padding: 24px 16px 60px; }

.section-title {
    font-size: 22px;
    font-weight: 700;
    margin: 0 0 16px;
    color: var(--c-text);
}
.section-sub {
    color: var(--c-text-muted);
    margin: -8px 0 16px;
    font-size: 15px;
}

/* ---------- Hero (home) ---------- */
.hero {
    background: linear-gradient(135deg, var(--c-primary), var(--c-primary-dark));
    color: #fff;
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    margin-bottom: 28px;
    box-shadow: var(--shadow);
}
.hero h1 { font-size: 30px; margin: 0 0 10px; font-weight: 800; line-height: 1.2; }
.hero p  { font-size: 17px; margin: 0 0 20px; opacity: .92; max-width: 600px; }
.hero .btn--ghost {
    background: rgba(255,255,255,.15);
    color: #fff;
    border-color: rgba(255,255,255,.5);
}
.hero .btn--ghost:hover { background: rgba(255,255,255,.25); color: #fff; }
.hero__cta { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---------- Cards / Grid ---------- */
.grid {
    display: grid;
    gap: 16px;
}
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }

.card {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    transition: box-shadow .2s, transform .2s;
}
.card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.card h3 { margin: 0 0 6px; font-size: 17px; font-weight: 700; }
.card p  { margin: 0; color: var(--c-text-muted); font-size: 14px; }
.card__icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: var(--c-primary-light);
    color: var(--c-primary-dark);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
}
.card__num {
    font-size: 28px;
    font-weight: 800;
    color: var(--c-primary-dark);
}

/* ---------- Estatisticas (dashboard) ---------- */
.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}
.stat {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 16px 18px;
    box-shadow: var(--shadow-sm);
}
.stat__label { font-size: 13px; color: var(--c-text-muted); margin: 0; }
.stat__value { font-size: 26px; font-weight: 800; margin: 4px 0 0; color: var(--c-text); }
.stat__value.is-success { color: var(--c-success); }
.stat__value.is-error   { color: var(--c-error); }

/* ---------- Desempenho ---------- */
.performance-heading {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 18px;
    margin-bottom: 20px;
}
.performance-heading .section-title { margin-bottom: 4px; }
.performance-heading .section-sub { margin: 0; }
.performance-eyebrow, .performance-insight__label {
    margin: 0 0 6px;
    color: var(--c-primary);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: .08em;
}
.performance-stats { margin-bottom: 18px; }
.performance-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    margin-bottom: 16px;
}
.performance-panel { min-width: 0; margin: 0; }
.performance-help { color: var(--c-text-muted); font-size: 14px; margin: -6px 0 16px; }
.performance-chart-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 28px;
    min-height: 210px;
}
.performance-chart {
    width: 180px;
    height: 180px;
    flex: 0 0 180px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: conic-gradient(var(--c-success) 0 var(--correct-rate), var(--c-error) var(--correct-rate) 100%);
}
.performance-chart__center {
    width: 132px;
    height: 132px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--c-surface);
}
.performance-chart__center strong { font-size: 27px; line-height: 1.2; }
.performance-chart__center span { color: var(--c-text-muted); font-size: 12px; }
.performance-legend { min-width: 120px; }
.performance-legend p {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 8px 0;
    color: var(--c-text-soft);
    font-size: 14px;
}
.performance-legend strong { margin-left: auto; color: var(--c-text); }
.performance-legend__dot { width: 10px; height: 10px; border-radius: 50%; }
.performance-legend__dot.is-success { background: var(--c-success); }
.performance-legend__dot.is-error { background: var(--c-error); }
.difficulty-list { display: flex; flex-direction: column; gap: 18px; padding-top: 5px; }
.difficulty-item__heading {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 7px;
    font-size: 14px;
}
.difficulty-item__heading span { color: var(--c-text-muted); }
.performance-bar {
    height: 9px;
    overflow: hidden;
    border-radius: 99px;
    background: var(--c-surface-2);
}
.performance-bar span {
    display: block;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--c-secondary), var(--c-success));
}
.performance-subjects { margin-bottom: 16px; }
.performance-subject-list { display: flex; flex-direction: column; gap: 15px; }
.performance-subject {
    display: grid;
    grid-template-columns: minmax(130px, 1fr) minmax(100px, 2fr) 48px auto;
    align-items: center;
    gap: 14px;
}
.performance-subject__info { display: flex; flex-direction: column; min-width: 0; }
.performance-subject__info strong {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 14px;
}
.performance-subject__info span { color: var(--c-text-muted); font-size: 12px; }
.performance-subject__percent { font-size: 14px; text-align: right; }
.performance-insights {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    margin-bottom: 16px;
}
.performance-insight {
    padding: 20px;
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    background: var(--c-surface);
    box-shadow: var(--shadow-sm);
}
.performance-insight--focus { border-left: 4px solid var(--c-warning); }
.performance-insight--strength { border-left: 4px solid var(--c-success); }
.performance-insight h2 { margin: 0 0 6px; font-size: 18px; }
.performance-insight p { margin: 0 0 10px; color: var(--c-text-muted); font-size: 14px; }
.performance-insight a { font-size: 14px; font-weight: 600; }
.performance-question-grid { margin-top: 0; }
.performance-question-list { list-style: none; margin: 0; padding: 0; }
.performance-question-list li {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 12px 0;
    border-bottom: 1px solid var(--c-border);
}
.performance-question-list li:first-child { padding-top: 0; }
.performance-question-list li:last-child { padding-bottom: 0; border-bottom: 0; }
.performance-question-list a { color: var(--c-text); font-size: 14px; font-weight: 600; }
.performance-question-list a:hover { color: var(--c-primary); }
.performance-question-list span { color: var(--c-text-muted); font-size: 12px; }
.performance-empty {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}
.performance-empty p { margin-bottom: 18px; }

/* ---------- Formularios ---------- */
.form-card {
    max-width: 420px;
    margin: 40px auto;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow);
}
.form-card.wide { max-width: 760px; }
.form-card h1 { margin: 0 0 6px; font-size: 24px; }
.form-card .sub { color: var(--c-text-muted); margin: 0 0 22px; font-size: 14px; }

.field { margin-bottom: 16px; }
.field label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--c-text-soft);
    margin-bottom: 6px;
}
.input, .select, .textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--c-border-strong);
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 15px;
    background: #fff;
    color: var(--c-text);
    transition: border-color .15s, box-shadow .15s;
}
.input:focus, .select:focus, .textarea:focus {
    outline: none;
    border-color: var(--c-primary);
    box-shadow: 0 0 0 3px var(--c-primary-light);
}
.textarea { min-height: 120px; resize: vertical; }
.field__hint { font-size: 12px; color: var(--c-text-muted); margin-top: 4px; }
.form-error {
    background: #fdeceb;
    color: #8e1d1d;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    margin-bottom: 16px;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

/* ---------- Layout questoes (sidebar filtros + lista) ---------- */
.layout-2 {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 24px;
    align-items: start;
}
.filters {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 18px;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 84px;
}
.filters h3 { margin: 0 0 14px; font-size: 16px; }
.filters .field { margin-bottom: 14px; }
.filters .field label { font-size: 12px; margin-bottom: 4px; }
.filters__actions { display: flex; gap: 8px; margin-top: 4px; }

/* ---------- Questao card ---------- */
.questao {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 22px;
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
}
.questao__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 14px;
}
.tag {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    background: var(--c-surface-2);
    color: var(--c-text-soft);
}
.tag--primary { background: var(--c-primary-light); color: var(--c-primary-dark); }
.tag--success { background: #e7f5ec; color: var(--c-success); }
.tag--warning { background: #fff4e5; color: var(--c-warning); }
.tag--error   { background: #fdeceb; color: var(--c-error); }

.questao__enunciado {
    font-size: 16px;
    line-height: 1.65;
    margin-bottom: 16px;
    white-space: pre-wrap;
}
.questao__texto-base {
    margin-bottom: 16px;
    padding: 14px;
    border-left: 3px solid var(--c-primary);
    border-radius: 6px;
    background: var(--c-surface-2);
    font-size: 14px;
    line-height: 1.6;
    white-space: pre-wrap;
}
.alternativas { display: flex; flex-direction: column; gap: 10px; }
.alternativa {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 14px;
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background .15s, border-color .15s;
    background: #fff;
}
.alternativa:hover { background: var(--c-primary-light); border-color: var(--c-primary); }
.alternativa.is-correct  { background: #e7f5ec; border-color: var(--c-success); }
.alternativa.is-wrong    { background: #fdeceb; border-color: var(--c-error); }
.alternativa__letter {
    flex: 0 0 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--c-surface-2);
    color: var(--c-text);
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}
.alternativa.is-correct .alternativa__letter { background: var(--c-success); color: #fff; }
.alternativa.is-wrong .alternativa__letter   { background: var(--c-error);   color: #fff; }
.alternativa__text { flex: 1; font-size: 15px; line-height: 1.5; }

.questao__hint { margin-top: 14px; }
.questao__hint-content {
    margin-top: 10px;
    padding: 12px 14px;
    border-left: 3px solid var(--c-warning);
    border-radius: 6px;
    background: #fff4e5;
    color: var(--c-text);
    font-size: 14px;
    line-height: 1.6;
}

.questao__footer {
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px dashed var(--c-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}
.questao__explicacao {
    margin-top: 14px;
    padding: 14px;
    background: var(--c-surface-2);
    border-left: 3px solid var(--c-primary);
    border-radius: 6px;
    font-size: 14px;
    line-height: 1.6;
}
.questao__explicacao h4 { margin: 0 0 6px; font-size: 13px; color: var(--c-primary-dark); text-transform: uppercase; letter-spacing: .04em; }

/* ---------- Paginacao ---------- */
.pagination {
    display: flex;
    gap: 6px;
    justify-content: center;
    margin-top: 22px;
    flex-wrap: wrap;
}
.pagination a, .pagination span {
    padding: 7px 12px;
    border: 1px solid var(--c-border);
    border-radius: 6px;
    font-size: 14px;
    background: #fff;
    color: var(--c-text-soft);
}
.pagination a:hover { background: var(--c-primary-light); color: var(--c-primary-dark); border-color: var(--c-primary); }
.pagination .is-active { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }

/* ---------- Concursos ---------- */
.concurso-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}
.concurso-card {
    overflow: hidden;
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    background: var(--c-surface);
    box-shadow: var(--shadow-sm);
    color: var(--c-text);
    text-decoration: none;
    transition: box-shadow .2s, transform .2s;
}
.concurso-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); color: var(--c-text); }
.concurso-card__image { display: block; width: 100%; height: 170px; object-fit: cover; }
.concurso-card__body { padding: 16px 18px; }
.concurso-card__body h2 { margin: 0 0 6px; font-size: 19px; }
.concurso-card__body p { margin: 0; color: var(--c-text-muted); font-size: 14px; }
.question-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 18px; }

/* ---------- Provas ---------- */
.prova-item {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 18px 20px;
    margin-bottom: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 14px;
    box-shadow: var(--shadow-sm);
}
.prova-item:hover { box-shadow: var(--shadow); }
.prova-item h3 { margin: 0 0 4px; font-size: 17px; }
.prova-item h2 { margin: 0 0 4px; font-size: 17px; }
.prova-item p  { margin: 0; color: var(--c-text-muted); font-size: 14px; }
.prova-item__actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* ---------- Admin ---------- */
.admin-bar {
    background: #0f172a;
    color: #fff;
    padding: 10px 0;
    margin-bottom: 20px;
}
.admin-bar .container { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.admin-bar a { color: #cbd5e1; font-size: 14px; }
.admin-bar a:hover { color: #fff; }
.admin-bar .is-active { color: #fff; font-weight: 600; }
.admin-bar__title { font-weight: 700; margin-right: auto; }

.panel {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 22px;
    margin-bottom: 18px;
    box-shadow: var(--shadow-sm);
}
.panel h2 { margin: 0 0 14px; font-size: 18px; }
.panel table { width: 100%; border-collapse: collapse; }
.panel th, .panel td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--c-border);
    font-size: 14px;
    text-align: left;
}
.panel th { color: var(--c-text-muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
.panel tr:last-child td { border-bottom: 0; }

/* ---------- Feedback / empty ---------- */
.empty {
    text-align: center;
    padding: 50px 20px;
    color: var(--c-text-muted);
}
.empty h3 { color: var(--c-text-soft); margin: 0 0 8px; }

/* ---------- Footer ---------- */
.footer {
    background: #0f172a;
    color: #cbd5e1;
    padding: 32px 0;
    margin-top: 40px;
}
.footer__inner { display: flex; flex-direction: column; gap: 6px; align-items: flex-start; }
.footer__brand { display: flex; align-items: center; gap: 8px; color: #fff; font-weight: 700; }
.footer__tag { margin: 6px 0; font-size: 14px; max-width: 540px; }
.footer__copy { font-size: 12px; color: #94a3b8; margin: 0; }

/* ============================================================
   Responsividade
   ============================================================ */
@media (max-width: 960px) {
    .stats { grid-template-columns: repeat(2, 1fr); }
    .grid--4 { grid-template-columns: repeat(2, 1fr); }
    .grid--3 { grid-template-columns: repeat(2, 1fr); }
    .concurso-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .layout-2 { grid-template-columns: 1fr; }
    .filters { position: static; }
    .performance-subject { grid-template-columns: minmax(110px, 1fr) minmax(80px, 2fr) 42px auto; gap: 9px; }
}

@media (max-width: 720px) {
    .nav, .topbar__actions { display: none; }
    .nav-toggle { display: flex; }

    /* menu mobile aberto */
    body.nav-open .nav {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--c-surface);
        border-bottom: 1px solid var(--c-border);
        padding: 10px 16px 16px;
        gap: 4px;
        box-shadow: var(--shadow);
    }
    body.nav-open .nav__link { padding: 12px 14px; }
    body.nav-open .topbar__actions {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        position: absolute;
        top: 64px;
        right: 0;
        background: var(--c-surface);
        padding: 10px 16px;
        border-left: 1px solid var(--c-border);
        box-shadow: var(--shadow);
    }

    .hero { padding: 28px 20px; }
    .hero h1 { font-size: 24px; }
    .hero p  { font-size: 15px; }

    .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
    .concurso-grid { grid-template-columns: 1fr; }
    .stats { grid-template-columns: 1fr 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .prova-item { flex-direction: column; align-items: flex-start; }
    .prova-item__actions { width: 100%; }
    .form-card { padding: 22px; margin: 24px 12px; }
    .main { padding: 16px 12px 40px; }
    .section-title { font-size: 19px; }
    .performance-heading { align-items: flex-start; flex-direction: column; }
    .performance-grid, .performance-insights { grid-template-columns: 1fr; }
    .performance-chart-wrap { gap: 18px; }
    .performance-subject { grid-template-columns: minmax(0, 1fr) 48px auto; }
    .performance-subject .performance-bar { grid-column: 1 / -1; grid-row: 2; }
    .performance-subject__percent { grid-column: 2; grid-row: 1; }
    .performance-subject .btn { grid-column: 3; grid-row: 1; }
}

@media (max-width: 420px) {
    .stats { grid-template-columns: 1fr; }
    .brand__text { display: none; }
    .performance-chart-wrap { flex-direction: column; }
}