:root {
    /* Vermelhos */
    --red: #ff1a1a;
    --red-rgb: 255, 26, 26;
    --red-dark: #7a0000;
    --red-soft: #ff5c5c;
    --red-soft-rgb: 255, 92, 92;
    --red-gradient: linear-gradient(135deg, var(--red) 0%, var(--red-dark) 100%);

    /* Pretos */
    --black: #0a0a0c;
    --surface: rgba(24, 24, 28, 0.55);
    --panel: rgba(20, 20, 24, 0.55);
    --field: rgba(0, 0, 0, 0.35);

    /* Texto */
    --text: #f5f5f7;
    --text-soft: #bdbdc7;
    --text-muted: #9a9aa5;

    /* Linhas translúcidas */
    --line: rgba(255, 255, 255, 0.08);
    --line-strong: rgba(255, 255, 255, 0.14);

    /* Semântica (único verde do projeto) */
    --success: #3ee08c;
    --success-bg: rgba(0, 200, 120, 0.12);
    --success-line: rgba(62, 224, 140, 0.3);

    /* Raios */
    --radius-sm: 8px;
    --radius: 10px;
    --radius-lg: 12px;
    --radius-xl: 25.5px;

    /* Sombras */
    --shadow-sm: 6px 6px 14px rgba(0, 0, 0, 0.55), -4px -4px 10px rgba(255, 255, 255, 0.03);
    --shadow-md: 10px 10px 24px rgba(0, 0, 0, 0.65), -6px -6px 18px rgba(255, 255, 255, 0.04);
    --shadow-inset: inset 3px 3px 8px rgba(0, 0, 0, 0.5), inset -3px -3px 8px rgba(255, 255, 255, 0.03);
    --shadow-inset-sm: inset 2px 2px 5px rgba(0, 0, 0, 0.4), inset -2px -2px 5px rgba(255, 255, 255, 0.03);
    --shadow-pressed: inset 4px 4px 10px rgba(0, 0, 0, 0.6), inset -4px -4px 10px rgba(255, 255, 255, 0.03);
    --glow-red: 0 0 18px rgba(var(--red-rgb), 0.3);
}

/* --------------------------------------------------------------------------
   2. BASE
   -------------------------------------------------------------------------- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    font-family: 'Inter', sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 15% 0%, rgba(var(--red-rgb), 0.10) 0%, transparent 45%),
        radial-gradient(circle at 85% 100%, rgba(var(--red-rgb), 0.08) 0%, transparent 50%),
        var(--black);
}

/* Texto só para leitores de tela e buscadores (o <h1> das páginas) */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

:focus-visible {
    outline: 2px solid var(--red-soft);
    outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   3. LAYOUT: cabeçalho e container
   -------------------------------------------------------------------------- */
header {
    position: relative;
    z-index: 1;
    padding: 34px 20.4px 68px;
    text-align: center;
    color: #fff;
    background: var(--red-gradient);
    border-bottom: 1px solid var(--line);
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    box-shadow: 0 12px 30px rgba(var(--red-rgb), 0.25), inset 0 -1px 0 var(--line);
}

header p {
    font-size: 0.765rem;
    font-weight: 400;
    opacity: 0.9;
}

.header-title {
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    font-weight: 700;
}

.header-subtitle {
    margin-top: 3.4px;
}

.header-link {
    color: inherit;
    text-decoration: none;
}

.container {
    position: relative;
    z-index: 2;
    flex: 1;
    width: 100%;
    max-width: 765px;
    margin: -34px auto 0;
    padding: 0 8.5px 17px;
}

@media (min-width: 600px) {
    .container {
        margin-top: -42.5px;
        padding: 0 17px 17px;
    }
}

/* --------------------------------------------------------------------------
   4. SUPERFÍCIES: painel (externo) e cartão (interno)
   -------------------------------------------------------------------------- */
.panel {
    margin: 0 15px 30px;
    padding: 20px;
    text-align: left;
    background: var(--panel);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    backdrop-filter: blur(18px) saturate(140%);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: 10px 10px 24px rgba(0, 0, 0, 0.6), -6px -6px 18px rgba(255, 255, 255, 0.03);
}

.panel-title {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 25px;
    padding-bottom: 5px;
    font-family: 'Poppins', sans-serif;
    font-size: 1.17rem;
    color: var(--red-soft);
    border-bottom: 2px solid var(--line);
}

.panel p,
.panel li {
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-soft);
}

.panel ul {
    padding-left: 18px;
    margin-top: 5px;
}

.card {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    padding: 21.25px;
    text-align: center;
    background: var(--surface);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    backdrop-filter: blur(18px) saturate(140%);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
}

.card--left {
    text-align: left;
}

/* --------------------------------------------------------------------------
   5. BOTÕES — um só sistema: .btn + variante de cor
      .btn-primary   vermelho cheio   (ação principal)
      .btn-secondary preto + vermelho (ação alternativa)
      .btn-ghost     preto neutro     (limpar, voltar, ajuda)
   -------------------------------------------------------------------------- */
.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    margin-top: 10px;
    padding: 12px;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.2;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    border-radius: var(--radius);
    transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s, border-color 0.2s, color 0.2s, filter 0.2s;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    color: #fff;
    background: var(--red-gradient);
    background-origin: border-box;
    box-shadow: var(--shadow-sm), -4px -4px 10px rgba(var(--red-rgb), 0.08), var(--glow-red);
}

.btn-primary:hover {
    filter: brightness(1.1);
}

.btn-primary:active {
    box-shadow: var(--shadow-pressed);
}

.btn-secondary {
    color: var(--red-soft);
    background: rgba(var(--red-rgb), 0.1);
    border-color: rgba(var(--red-rgb), 0.45);
    box-shadow: var(--shadow-inset-sm);
}

.btn-secondary:hover {
    background: rgba(var(--red-rgb), 0.18);
    border-color: rgba(var(--red-rgb), 0.65);
}

.btn-ghost {
    color: var(--text-soft);
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-inset-sm);
}

.btn-ghost:hover {
    color: var(--text);
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Pílula pequena (cabeçalho da home: Copiar / Android / iOS) */
.chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 4px 10px;
    font-family: 'Inter', sans-serif;
    font-size: 10px;
    font-weight: 500;
    color: #fff;
    text-decoration: none;
    cursor: pointer;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    box-shadow: inset 1px 1px 3px rgba(0, 0, 0, 0.4), inset -1px -1px 2px rgba(255, 255, 255, 0.05);
    transition: transform 0.2s, background-color 0.2s;
}

.chip:active {
    transform: scale(0.95);
    background: rgba(0, 0, 0, 0.45);
}

.chip-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 10px;
}

/* --------------------------------------------------------------------------
   6. FORMULÁRIOS
   -------------------------------------------------------------------------- */
.input-group {
    margin-bottom: 15px;
    text-align: left;
}

.input-group label,
.input-week-group label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 5px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
}

.input-group input,
.input-week-group input {
    width: 100%;
    padding: 10px;
    font-family: inherit;
    font-size: 1rem;
    color: var(--text);
    background-color: var(--field);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-inset);
    transition: border-color 0.2s;
}

.input-week-group input {
    text-align: center;
}

.input-group input:focus,
.input-week-group input:focus {
    outline: none;
    border-color: var(--red);
    background-color: rgba(0, 0, 0, 0.5);
    box-shadow: inset 3px 3px 8px rgba(0, 0, 0, 0.6), 0 0 0 2px rgba(var(--red-rgb), 0.25);
}

/* Notas das 7 semanas (atividades-semanais) */
.weeks-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
    text-align: left;
}

.span-all {
    grid-column: 1 / -1;
}

@media (max-width: 400px) {
    .weeks-grid {
        grid-template-columns: 1fr;
    }
}

/* Peso da semana: quanto mais vermelho, mais a semana vale */
.badge-weight {
    padding: 2px 6px;
    font-size: 0.7rem;
    font-weight: 700;
    border-radius: 4px;
}

.w-low {
    color: var(--text-soft);
    background: rgba(255, 255, 255, 0.08);
}

.w-mid {
    color: var(--red-soft);
    background: rgba(var(--red-rgb), 0.12);
}

.w-high {
    color: var(--text);
    background: rgba(var(--red-rgb), 0.35);
}

/* --------------------------------------------------------------------------
   7. RESULTADOS E AVISOS
   -------------------------------------------------------------------------- */
.resultado {
    display: none;
    margin-top: 15px;
    padding: 15px;
    font-family: 'Inter', sans-serif;
    line-height: 1.5;
    text-align: center;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
}

.resultado--ok {
    color: var(--success);
    background-color: var(--success-bg);
    border-color: var(--success-line);
}

.resultado--erro {
    color: var(--red-soft);
    background-color: rgba(var(--red-rgb), 0.12);
    border-color: rgba(var(--red-soft-rgb), 0.3);
}

.resultado--info {
    color: var(--text);
    background-color: rgba(255, 255, 255, 0.06);
    border-color: var(--line-strong);
}

.resultado--info strong {
    color: var(--red-soft);
}

.resultado hr {
    margin: 10px 0;
    border: 0;
    border-top: 1px solid var(--line-strong);
}

.result-highlight {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--red-soft);
}

.result-big {
    font-size: 1.3rem;
}

.explain-box {
    display: none;
    margin-bottom: 20px;
    padding: 15px;
    text-align: left;
    font-size: 0.85rem;
    color: var(--text-soft);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.explain-box ul {
    margin-left: 20px;
}

.explain-box ul + p {
    margin-top: 10px;
}

/* Cartões informativos (calendario-univesp) */
.info-note {
    margin: 16px 0;
    padding: 15px 16px;
    text-align: left;
    background: rgba(var(--red-rgb), 0.08);
    border: 1px solid rgba(var(--red-rgb), 0.25);
    border-radius: var(--radius);
}

.info-note h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
    font-family: 'Poppins', sans-serif;
    font-size: 0.9rem;
    color: var(--red-soft);
}

.info-note p {
    margin: 0;
    font-size: 0.82rem;
    line-height: 1.6;
    color: var(--text-soft);
}

.info-note--neutral {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
}

.info-note--neutral h3 {
    color: var(--text);
}

/* --------------------------------------------------------------------------
   8. HOME: grade de atalhos 3×3
   -------------------------------------------------------------------------- */
.menu-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3px;
    justify-content: center;
}

.menu-item {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    height: 54px;
    padding: 3px 1px;
    overflow: hidden;
    text-align: center;
    text-decoration: none;
    color: var(--text);
    background: var(--surface);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
    backdrop-filter: blur(14px) saturate(140%);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.menu-item:hover {
    transform: translateY(-2px);
    border-color: rgba(var(--red-rgb), 0.4);
    box-shadow: var(--shadow-md), 0 0 16px rgba(var(--red-rgb), 0.25);
}

.menu-item:active {
    transform: scale(0.98);
    box-shadow: var(--shadow-pressed);
}

.menu-item span {
    font-size: 0.38rem;
    font-weight: 600;
    line-height: 1.05;
    color: var(--text);
    word-break: break-word;
}

.icon-box {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    margin-bottom: 2px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 5.5px;
    box-shadow: inset 1px 1px 3px rgba(0, 0, 0, 0.55), inset -1px -1px 2px rgba(255, 255, 255, 0.05);
    transition: background 0.3s;
}

.menu-item i {
    width: 9px;
    height: 9px;
    color: var(--text);
    stroke-width: 2.5px;
}

/* As 3 calculadoras principais pulsam de leve */
.menu-item.calc-glow {
    box-shadow: var(--shadow-sm), 0 0 14px rgba(var(--red-rgb), 0.55);
    animation: calcGlowPulse 2s ease-in-out infinite;
}

.menu-item.calc-glow:hover {
    box-shadow: var(--shadow-md), 0 0 16px rgba(var(--red-rgb), 0.25), 0 0 20px rgba(var(--red-rgb), 0.6);
}

@keyframes calcGlowPulse {
    0%, 100% { box-shadow: var(--shadow-sm), 0 0 8px rgba(var(--red-rgb), 0.35); }
    50%      { box-shadow: var(--shadow-sm), 0 0 20px rgba(var(--red-rgb), 0.75); }
}

@media (min-width: 600px) {
    .menu-grid {
        gap: 6px;
    }

    .menu-item {
        height: 66px;
        padding: 5px;
    }

    .menu-item span {
        font-size: 0.48rem;
    }

    .icon-box {
        width: 26px;
        height: 26px;
        margin-bottom: 4px;
    }

    .menu-item i {
        width: 12px;
        height: 12px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .menu-item.calc-glow {
        animation: none;
    }
}