:root {
    --bg:      #0f172a;
    --card:    #1e293b;
    --line:    #334155;
    --text:    #e2e8f0;
    --muted:   #94a3b8;
    --primary: #3b82f6;
    --danger:  #ef4444;
    --ok:      #22c55e;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

.wrap {
    max-width: 880px;
    margin: 0 auto;
    padding: 32px 20px;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

h1 { font-size: 1.6rem; margin: 0 0 4px; }
h2 { font-size: 1.2rem; margin: 0 0 16px; }
h3 { margin: 0 0 2px; font-size: 1.05rem; }

.muted { color: var(--muted); font-size: 0.9rem; }

.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 24px;
    margin-bottom: 20px;
}

.card-login,
.card-modal {
    max-width: 380px;
    margin: 10vh auto 0;
    text-align: center;
}

label {
    display: block;
    text-align: left;
    margin: 14px 0 6px;
    font-size: 0.9rem;
    color: var(--muted);
}

input[type=text],
input[type=password],
input[type=file],
textarea {
    width: 100%;
    padding: 11px 12px;
    border-radius: 9px;
    border: 1px solid var(--line);
    background: #0f172a;
    color: var(--text);
    font-size: 1rem;
    font-family: inherit;
}

textarea {
    resize: vertical;
    line-height: 1.4;
}

code {
    background: #0f172a;
    border: 1px solid var(--line);
    border-radius: 5px;
    padding: 1px 6px;
    font-size: 0.85em;
}

.acciones { white-space: nowrap; }
.acciones .btn-sm { margin-right: 6px; }

.edit-row td { background: #162033; }
.edit-form {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 16px;
    align-items: flex-end;
}
.edit-form > div { flex: 1 1 220px; }
.edit-form label { margin: 0 0 4px; }
.edit-form .btn { width: auto; margin-top: 0; }

.msg-box {
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px solid var(--line);
}
.msg-box .btn { width: auto; margin-top: 10px; }
.msg-box label { margin-top: 0; }

.btn {
    display: inline-block;
    border: none;
    border-radius: 9px;
    padding: 11px 18px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: opacity .15s;
}
.btn:hover { opacity: .88; }
.btn-primary { background: var(--primary); color: #fff; margin-top: 18px; width: 100%; }
.btn-ghost   { background: transparent; color: var(--muted); border: 1px solid var(--line); }
.btn-danger  { background: var(--danger); color: #fff; }
.btn-sm      { padding: 6px 12px; font-size: 0.8rem; }

.grid { display: flex; flex-direction: column; gap: 12px; }

.curso {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 18px 22px;
}
.curso .btn-primary { margin-top: 0; width: auto; }

table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; }
td form { margin: 0; }

.alert { padding: 11px 14px; border-radius: 9px; margin-bottom: 14px; font-size: 0.9rem; }
.alert.error { background: rgba(239,68,68,.15);  border: 1px solid var(--danger); color: #fca5a5; }
.alert.ok    { background: rgba(34,197,94,.15);   border: 1px solid var(--ok);     color: #86efac; }

.overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.7);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    z-index: 50;
}
.card-modal { margin-top: 15vh; width: 90%; }

.link-volver {
    display: inline-block;
    margin-top: 14px;
    color: var(--muted);
    font-size: 0.85rem;
    text-decoration: none;
}
.link-volver:hover { color: var(--text); }