:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --input-bg: #0f172a;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #38bdf8;
    --primary-hover: #0284c7;
    --border-color: #334155;
    --card-border: #475569;
}

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

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem 1rem;
}

.app-container {
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* --- HEADER --- */
header {
    text-align: center;
}

header h1 {
    font-size: 2.2rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

header p {
    color: var(--text-muted);
    font-size: 1rem;
}

/* --- FORMULARIO DE PUBLICACIÓN --- */
.wall-form-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-row {
    display: flex;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    flex: 1;
}

label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 600;
}

input[type="text"],
textarea {
    width: 100%;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem;
    color: var(--text-main);
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}

input[type="text"]:focus,
textarea:focus {
    border-color: var(--primary);
}

textarea {
    resize: vertical;
    min-height: 80px;
}

.btn-publish {
    background-color: var(--primary);
    color: #0f172a;
    border: none;
    border-radius: 8px;
    padding: 0.8rem;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

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

.btn-publish:active {
    transform: scale(0.99);
}

/* --- SECCIÓN DEL MURO --- */
.wall-section-title {
    font-size: 1.2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.badge-live {
    background-color: rgba(56, 189, 248, 0.1);
    color: var(--primary);
    border: 1px solid var(--primary);
    font-size: 0.75rem;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
}

.wall-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.25rem;
}

/* --- TARJETA DE MENSAJE --- */
.message-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 0.75rem;
    transition: border-color 0.2s;
}

.message-card:hover {
    border-color: var(--card-border);
}

.message-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.author-name {
    font-weight: 700;
    color: var(--primary);
    font-size: 0.95rem;
}

.message-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.message-body {
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--text-main);
    word-break: break-word;
}

@media (max-width: 600px) {
    .form-row {
        flex-direction: column;
    }
}