:root {
    --gray-900: #18181b;
    --gray-800: #26262b;
    --gray-700: #3a3a42;
    --gray-border: #52525b;
    --red: #c0272d;
    --red-dark: #9c1f24;
    --red-bg: #fbe7e7;
    --color-text: #1f2937;
    --color-muted: #6b7280;
    --color-border: #e2e6ec;
    --color-bg: #f3f5f8;
    --color-card: #ffffff;
    --color-red: #b91c1c;
    --color-red-bg: #fde8e8;
    --color-amber: #b45309;
    --color-amber-bg: #fef3c7;
    --color-green: #15803d;
    --color-green-bg: #dcfce7;
    --color-gray: #4b5563;
    --color-gray-bg: #e5e7eb;
    --radius: 10px;
    --sidebar-width: 240px;
}

* { box-sizing: border-box; }

.is-hidden { display: none !important; }

body {
    margin: 0;
    font-family: -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.45;
}

a { color: var(--red-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

h1 { font-size: 1.4rem; margin: 0.2em 0 0.6em; }
h2 { font-size: 1.1rem; margin: 0 0 0.6em; }
h3 { font-size: 1rem; margin: 1em 0 0.4em; }

/* ============ App shell: sidebar + topbar + content (admin) ============ */
.app-shell { display: flex; min-height: 100vh; }

.sidebar {
    width: var(--sidebar-width);
    flex: 0 0 var(--sidebar-width);
    background: var(--gray-800);
    color: #d9d9dc;
    padding: 1.1rem 0.9rem;
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
}

.sidebar-callout {
    background: var(--gray-700);
    border: 1px solid var(--gray-border);
    border-radius: var(--radius);
    padding: 0.9rem;
}
.sidebar-callout h2 { color: #fff; font-size: 0.92rem; margin-bottom: 0.4rem; }
.sidebar-callout p { font-size: 0.82rem; color: #b8b8bd; margin: 0 0 0.7rem; }

.sidebar-section-label {
    font-size: 0.72rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #8f8f96;
    padding: 0 0.4rem;
    margin: 0.2rem 0 -0.4rem;
}

.sidebar-nav { display: flex; flex-direction: column; gap: 0.15rem; }
.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.55rem 0.6rem;
    border-radius: 8px;
    color: #cfcfd3;
    font-size: 0.9rem;
    border-left: 3px solid transparent;
}
.sidebar-nav a:hover { background: var(--gray-700); text-decoration: none; }
.sidebar-nav a.active {
    background: var(--gray-700);
    color: #fff;
    font-weight: 600;
    border-left-color: var(--red);
}
.sidebar-nav .nav-icon { font-size: 1.05rem; width: 1.2em; text-align: center; }

.app-main { flex: 1; min-width: 0; display: flex; flex-direction: column; }

/* --- Topbar (admin y portal público) --- */
.topbar {
    background: var(--gray-900);
    color: #fff;
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.65rem 1.25rem;
    flex-wrap: wrap;
}
.topbar-brand { display: flex; align-items: center; gap: 0.7rem; margin-right: auto; }
.topbar-brand .brand-name { font-weight: 800; font-size: 1.02rem; letter-spacing: 0.01em; }
.brand-logo-chip { background: #fff; border-radius: 6px; padding: 4px 10px; display: inline-flex; align-items: center; line-height: 0; }
.brand-logo-chip img { display: block; height: 34px; width: auto; }
.brand-subtitle { font-size: 0.85rem; color: #cfd2d8; }
.topbar-actions { display: flex; align-items: center; gap: 0.6rem; }
.topbar-actions form { margin: 0; }
.sidebar-toggle { display: none; background: none; border: none; color: #fff; font-size: 1.4rem; cursor: pointer; }

.btn-topbar {
    background: var(--gray-700);
    border: 1px solid var(--gray-border);
    color: #eceef1;
    padding: 0.45rem 0.8rem;
    border-radius: 7px;
    font-size: 0.85rem;
    cursor: pointer;
}
.btn-topbar:hover { background: var(--gray-border); text-decoration: none; }
.btn-cta {
    background: var(--red);
    border: 1px solid var(--red);
    color: #fff;
    font-weight: 700;
    padding: 0.5rem 0.95rem;
    border-radius: 7px;
    font-size: 0.87rem;
    cursor: pointer;
}
.btn-cta:hover { background: var(--red-dark); border-color: var(--red-dark); text-decoration: none; color: #fff; }

.content { padding: 1.25rem 1.5rem 3rem; flex: 1; }
.content-public { max-width: 640px; margin: 0 auto; width: 100%; }

/* --- Flash / alert messages --- */
.flash { padding: 0.6rem 0.9rem; border-radius: var(--radius); margin-bottom: 1rem; font-size: 0.95rem; }
.flash-success { background: var(--color-green-bg); color: var(--color-green); }
.flash-error { background: var(--color-red-bg); color: var(--color-red); }
.flash-warning { background: var(--color-amber-bg); color: var(--color-amber); }
.flash-info { background: var(--color-gray-bg); color: var(--color-gray); }

/* --- Auth (login / acceso publico): sin sidebar, tarjeta centrada --- */
.auth-shell { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--gray-900); padding: 1rem; }
.auth-box {
    width: 100%;
    max-width: 380px;
    margin: 1rem;
    background: var(--color-card);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: 0 10px 30px rgba(0,0,0,0.25);
}
.auth-box h1 { text-align: center; color: var(--gray-900); }
.auth-box .brand-logo { display: block; margin: 0 auto 1rem; max-width: 220px; height: auto; }

/* --- Page header / actions --- */
.page-header { display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 1rem; }
.page-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.subtitle { color: var(--color-muted); margin: -0.5em 0 1em; }
.hint { color: var(--color-muted); font-size: 0.88rem; }

/* --- Cards --- */
.card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.1rem 1.25rem;
    margin-bottom: 1.25rem;
}
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1rem; margin-bottom: 1.25rem; }

/* --- Forms --- */
.form-card { background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 1.25rem; max-width: 900px; margin-bottom: 1.25rem; }
.form-row { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 0.25rem; }
.form-group { margin-bottom: 0.9rem; flex: 1 1 180px; }
.form-narrow { flex: 0 1 160px; }
.form-checkbox { display: flex; align-items: center; }
.form-checkbox label { display: flex; align-items: center; gap: 0.4rem; font-weight: normal; margin-bottom: 0; }
.form-actions { display: flex; gap: 0.6rem; margin-top: 1rem; flex-wrap: wrap; }
.form-upload-row { display: flex; gap: 0.6rem; align-items: flex-end; flex-wrap: wrap; margin-top: 0.6rem; }

label { display: block; font-weight: 600; font-size: 0.88rem; margin-bottom: 0.3rem; color: var(--color-text); }
input[type=text], input[type=password], input[type=email], input[type=number],
input[type=date], input[type=file], input[type=color], select, textarea {
    width: 100%;
    padding: 0.5rem 0.6rem;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 0.95rem;
    font-family: inherit;
    background: #fff;
    color: var(--color-text);
}
input[type=color] { padding: 0.2rem; height: 2.4rem; }
textarea { resize: vertical; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--red); outline-offset: 1px; }

.search-form { display: flex; gap: 0.6rem; flex-wrap: wrap; margin-bottom: 1rem; align-items: flex-end; }
.search-form input[type=text] { flex: 2 1 220px; }
.search-form input[type=date] { flex: 1 1 150px; }
.search-form select { flex: 1 1 160px; }

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 0.5rem 0.9rem;
    border-radius: 6px;
    border: 1px solid var(--color-border);
    background: #fff;
    color: var(--color-text);
    font-size: 0.9rem;
    cursor: pointer;
}
.btn:hover { background: #f0f2f5; text-decoration: none; }
.btn-primary { background: var(--red); border-color: var(--red); color: #fff; font-weight: 700; }
.btn-primary:hover { background: var(--red-dark); border-color: var(--red-dark); color: #fff; }
.btn-secondary { background: #fff; }
.btn-danger { color: var(--color-red); border-color: var(--color-red); }
.btn-danger:hover { background: var(--color-red-bg); }
.btn-sm { padding: 0.28rem 0.6rem; font-size: 0.82rem; }
.btn-block { width: 100%; text-align: center; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn:disabled:hover { background: #fff; }

/* --- Tables --- */
.table-responsive { overflow-x: auto; margin-bottom: 1rem; }
.table { width: 100%; border-collapse: collapse; background: var(--color-card); font-size: 0.92rem; }
.table th, .table td { padding: 0.6rem 0.7rem; border-bottom: 1px solid var(--color-border); text-align: left; vertical-align: middle; }
.table th { color: var(--color-muted); font-weight: 600; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.02em; white-space: nowrap; }
.table td.nowrap, .table td.col-actions, .table td.col-badge { white-space: nowrap; }
.table td.col-actions { text-align: right; }
.table td.col-actions form { display: inline; }
.table tbody tr:hover { background: #fafbfa; }
.empty-state { color: var(--color-muted); padding: 1rem 0; white-space: normal; text-align: center; }

/* --- Badges --- */
.badge { display: inline-block; padding: 0.2rem 0.55rem; border-radius: 999px; font-size: 0.78rem; font-weight: 600; }
.badge-red { background: var(--color-red-bg); color: var(--color-red); }
.badge-amber { background: var(--color-amber-bg); color: var(--color-amber); }
.badge-green { background: var(--color-green-bg); color: var(--color-green); }
.badge-gray { background: var(--color-gray-bg); color: var(--color-gray); }

/* --- Pagination --- */
.pagination { display: flex; gap: 0.35rem; list-style: none; padding: 0; margin: 0 0 1rem; flex-wrap: wrap; }
.pagination a, .pagination span {
    display: inline-block;
    padding: 0.35rem 0.7rem;
    border-radius: 6px;
    border: 1px solid var(--color-border);
    background: #fff;
    color: var(--color-text);
    font-size: 0.85rem;
}
.pagination .active a, .pagination .active span { background: var(--gray-900); border-color: var(--gray-900); color: #fff; }

/* --- Definition lists (ficha de maquina) --- */
.def-list { display: grid; grid-template-columns: auto 1fr; gap: 0.4rem 1rem; margin: 0; }
.def-list dt { color: var(--color-muted); font-size: 0.85rem; }
.def-list dd { margin: 0; }

.fleet-code {
    display: inline-block;
    background: var(--gray-900);
    color: #fff;
    font-weight: 800;
    font-size: 1.6rem;
    padding: 0.25rem 0.75rem;
    border-radius: 8px;
    margin-bottom: 0.75rem;
}

/* --- Galeria de fotos + lightbox --- */
.photo-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 0.6rem; }
.photo-thumb { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; border-radius: 8px; border: 1px solid var(--color-border); display: block; }
.photo-thumb-btn { padding: 0; border: none; background: none; cursor: pointer; width: 100%; }
.photo-thumb-actions { display: flex; gap: 0.3rem; margin-top: 0.35rem; }

dialog.visor-foto {
    border: none;
    border-radius: var(--radius);
    padding: 0;
    max-width: 92vw;
    max-height: 92vh;
    background: transparent;
    position: fixed;
    inset: 0;
    margin: auto;
}
dialog.visor-foto::backdrop { background: rgba(0, 0, 0, .82); }
dialog.visor-foto img { display: block; max-width: 92vw; max-height: 92vh; border-radius: var(--radius); }
dialog.visor-foto form { position: absolute; top: .5rem; right: .5rem; margin: 0; }

/* --- Documentos --- */
.doc-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 0.75rem; }
.doc-card {
    display: block;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-card);
    padding: 0.8rem 1rem;
}
.doc-card-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    color: var(--color-text);
}
.doc-card-link:hover { text-decoration: none; color: var(--red-dark); }
.doc-card.disponible { border-left: 4px solid var(--color-green); }
.doc-card.no-disponible { border-left: 4px solid var(--color-gray); color: var(--color-muted); }
.doc-card .doc-icon { font-size: 1.2rem; }
.doc-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.4rem; }
.doc-list li { display: flex; justify-content: space-between; align-items: center; gap: 0.5rem; padding: 0.5rem 0; border-bottom: 1px solid var(--color-border); }
.doc-list li:last-child { border-bottom: none; }

/* --- Admin: gestión de fotos y documentos de una máquina --- */
.admin-photo-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 1rem; margin-bottom: 1rem; }
.admin-photo-item img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; border-radius: 8px; border: 1px solid var(--color-border); display: block; }
.admin-photo-actions { display: flex; gap: 0.3rem; margin-top: 0.4rem; }
.admin-photo-actions form { margin: 0; }
.admin-photo-actions .btn-danger { margin-left: auto; }

.doc-manage-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 0.9rem; }
.doc-manage-card { border: 1px solid var(--color-border); border-radius: var(--radius); background: var(--color-card); padding: 0.9rem 1rem; }
.doc-manage-card h3 { margin: 0 0 0.5rem; font-size: 0.95rem; }
.doc-manage-current { margin-bottom: 0.5rem; }
.doc-manage-current a { font-weight: 600; }

.session-banner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    background: var(--color-gray-bg);
    color: var(--color-gray);
    border-radius: var(--radius);
    padding: 0.5rem 0.9rem;
    font-size: 0.85rem;
    margin-bottom: 1.1rem;
}

.app-footer { text-align: center; color: var(--color-muted); font-size: 0.82rem; padding: 2rem 0 1rem; }

.installer-shell { min-height: 100vh; background: var(--color-bg); padding: 3rem 1rem; }
.installer-box { max-width: 640px; margin: 0 auto; }

/* --- Responsive --- */
@media (max-width: 900px) {
    .sidebar-toggle { display: block; }
    .sidebar {
        position: fixed;
        z-index: 40;
        top: 0; bottom: 0; left: 0;
        transform: translateX(-100%);
        transition: transform 0.2s ease;
        box-shadow: 4px 0 16px rgba(0,0,0,0.25);
    }
    .sidebar.open { transform: translateX(0); }
    .content { padding: 1rem; }
    .topbar { padding: 0.6rem 0.9rem; }
    .search-form { flex-direction: column; align-items: stretch; }
}