:root {
    --primary-color: #4CAF50;
    --secondary-color: #45a049;
    --background-color: #f5f5f5;
    --text-color: #333;
    --border-radius: 8px;
    --box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: var(--background-color);
    color: var(--text-color);
}

header {
    background-color: white;
    padding: 1rem;
    box-shadow: var(--box-shadow);
    margin-bottom: 2rem;
}

header h1 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 1rem;
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
    gap: 2rem;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: background-color 0.3s;
}

nav a:hover, nav a.active {
    background-color: var(--primary-color);
    color: white;
}

main {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1rem;
}

.programar-container {
    background-color: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

input, textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
}

textarea {
    min-height: 120px;
    resize: vertical;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    width: 100%;
    transition: background-color 0.3s;
}

.btn-primary:hover {
    background-color: var(--secondary-color);
}

.mensagens-container {
    background-color: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.mensagens-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.mensagem-card {
    background-color: white;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: transform 0.2s;
}

.mensagem-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow);
}

.mensagem-card.enviada {
    background-color: #f8f8f8;
    opacity: 0.8;
}

.mensagem-info {
    flex: 1;
}

.mensagem-data {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.mensagem-conteudo {
    color: var(--text-color);
    word-break: break-word;
}

.mensagem-acoes {
    display: flex;
    gap: 0.5rem;
}

.btn-editar, .btn-excluir {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.3s;
}

.btn-editar {
    background-color: #2196F3;
    color: white;
}

.btn-editar:hover {
    background-color: #1976D2;
}

.btn-excluir {
    background-color: #f44336;
    color: white;
}

.btn-excluir:hover {
    background-color: #d32f2f;
}

.sem-mensagens {
    text-align: center;
    color: #666;
    padding: 2rem;
}

.mensagem-numero {
    color: #2196F3;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

small {
    display: block;
    color: #666;
    font-size: 0.8rem;
    margin-top: 0.3rem;
}

@media (max-width: 600px) {
    nav ul {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .programar-container {
        padding: 1rem;
    }

    .mensagem-card {
        flex-direction: column;
        gap: 1rem;
    }

    .mensagem-acoes {
        width: 100%;
        justify-content: space-between;
    }

    .btn-editar, .btn-excluir {
        flex: 1;
    }
}

input[type="date"],
input[type="time"] {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    background-color: white;
    position: relative;
}

input[type="date"]::-webkit-calendar-picker-indicator,
input[type="time"]::-webkit-calendar-picker-indicator {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: auto;
    height: auto;
    color: transparent;
    background: transparent;
    cursor: pointer;
}

input[type="date"]:hover,
input[type="time"]:hover {
    border-color: var(--primary-color);
}

input[type="date"]:focus,
input[type="time"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.2);
}