:root {
    --bg-1: #ffffff;
    --accent: #0284c7;
    --accent-2: #059669;
    --vinho: #7b2340;
    --danger: #dc2626;
    --text: #1a1a1a;
    --text-muted: #4b5563;
    --card-bg: #f8f8f8;
    --card-border: #e0e0e0;
}

* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    font-family: 'Montserrat', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg-1);
    color: var(--text);
    margin: 0;
    padding: 24px 40px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* ---------- Cabeçalho ---------- */
.cabecalho {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 8px;
}

.cabecalho img.logo {
    height: 64px;
    width: auto;
    filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.4));
}

.cabecalho img.logo[hidden] {
    display: none;
}

h1 {
    text-align: center;
    font-size: 2.6rem;
    margin: 0;
    letter-spacing: 0.5px;
    color: var(--accent);
}

.relogio {
    text-align: center;
    font-size: 4.2rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    margin-bottom: 28px;
    color: var(--vinho);
}

/* ---------- Overlay inicial ---------- */
#overlay-iniciar {
    position: fixed;
    inset: 0;
    background: var(--bg-1);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 24px;
    transition: opacity 0.5s ease;
}

#overlay-iniciar h2 {
    font-size: 3rem;
    color: var(--accent);
    margin: 0;
    text-align: center;
}

#overlay-iniciar button {
    padding: 22px 56px;
    font-size: 2rem;
    background: linear-gradient(135deg, var(--accent-2), #059669);
    color: #fff;
    border: none;
    border-radius: 16px;
    cursor: pointer;
    font-weight: 700;
    box-shadow: 0 14px 30px -8px rgba(16, 185, 129, 0.55);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

#overlay-iniciar button:hover {
    transform: translateY(-2px) scale(1.03);
    box-shadow: 0 18px 34px -6px rgba(16, 185, 129, 0.65);
}

#overlay-iniciar p {
    color: var(--text-muted);
    font-size: 1.15rem;
    text-align: center;
    margin: 0;
}

/* ---------- Cards ---------- */
#container-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 26px;
    padding: 0 30px;
    opacity: 1;
    transition: opacity 0.5s ease-in-out;
    flex: 1;
    align-content: center;
}

.tela-escondida {
    opacity: 0 !important;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-left: 8px solid var(--accent);
    border-radius: 16px;
    padding: 26px 30px;
    box-shadow: 0 10px 25px -12px rgba(15, 23, 42, 0.18);
    transform: scale(1);
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
}

.professor {
    font-size: 2.1rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text);
}

.proxima-reuniao {
    font-size: 1.4rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.proxima-reuniao .horario {
    font-size: 1.25em;
    color: var(--danger);
    font-weight: 700;
}

.destaque {
    color: #b45309;
    font-weight: 700;
    font-size: 1.75rem;
}

.alerta-preparar {
    border-left-color: var(--danger);
    background: #fef2f2;
    animation: pulse 2s infinite;
}

.aviso-dirigir {
    color: var(--danger);
    margin-top: 12px;
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: 0.5px;
}

.mensagem-vazia {
    grid-column: span 2;
    text-align: center;
    font-size: 1.9rem;
    color: var(--text-muted);
    margin-top: 40px;
    font-style: italic;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(220, 38, 38, 0.45); }
    70% { box-shadow: 0 0 0 22px rgba(220, 38, 38, 0); }
    100% { box-shadow: 0 0 0 0 rgba(220, 38, 38, 0); }
}