/* main.css — solucionariosenpdf.com */
@import url('vars.css');

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

html { font-size: var(--font-size-base); scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: var(--line-height-body);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main { flex: 1; }

h1,h2,h3,h4,h5,h6 {
    font-family: var(--font-heading);
    line-height: 1.25;
    color: var(--color-text);
    font-weight: 700;
}

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

img { max-width: 100%; display: block; }

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1rem;
}
@media(min-width:768px){ .container { padding: 0 1.5rem; } }
@media(min-width:1280px){ .container { padding: 0 2rem; } }

/* ── Botones ─────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
    text-decoration: none;
    min-height: 44px;
    white-space: nowrap;
}
.btn-primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: var(--shadow-primary);
}
.btn-primary:hover {
    background: var(--color-primary-dark);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(59,130,246,0.45);
}
.btn-secondary {
    background: var(--color-secondary);
    color: #fff;
}
.btn-secondary:hover { background: #059669; color:#fff; transform:translateY(-1px); }
.btn-outline {
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}
.btn-outline:hover { background: var(--color-primary); color:#fff; }
.btn-ghost { background:transparent; color:var(--color-text-muted); }
.btn-ghost:hover { background:var(--color-border); color:var(--color-text); }
.btn-danger { background:var(--color-danger); color:#fff; }
.btn-sm { padding:0.375rem 0.75rem; font-size:0.8125rem; min-height:36px; }
.btn-lg { padding:0.875rem 1.75rem; font-size:1rem; min-height:52px; }
.btn-full { width:100%; justify-content:center; }

/* ── Cards ───────────────────────────────────────────── */
.card {
    background: var(--color-card-bg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }

/* ── Badges ──────────────────────────────────────────── */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.625rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1;
    white-space: nowrap;
}
.badge-primary { background: #EFF6FF; color: #1D4ED8; }
.badge-secondary { background: #ECFDF5; color: #065F46; }
.badge-accent { background: #FFFBEB; color: #92400E; }
.badge-gray { background: #F1F5F9; color: #475569; }

/* ── Stars ───────────────────────────────────────────── */
.stars { display:inline-flex; gap:1px; }
.star-filled { color: var(--color-accent); }
.star-empty  { color: var(--color-border); }

/* ── Sección hero ────────────────────────────────────── */
.hero {
    background: linear-gradient(135deg, #0F172A 0%, #1E3A5F 60%, #1e40af 100%);
    padding: 3.5rem 0;
    position: relative;
    overflow: hidden;
}
.hero::before {
    content:'';
    position:absolute;
    inset:0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero-content { position:relative; z-index:1; text-align:center; }
.hero h1 { color:#fff; font-size:clamp(1.75rem,4vw,2.75rem); margin-bottom:1rem; text-shadow:0 2px 8px rgba(0,0,0,0.3); }
.hero p   { color:#94A3B8; font-size:1.125rem; margin-bottom:2rem; max-width:560px; margin-left:auto; margin-right:auto; }

/* Barra búsqueda hero */
.hero-search {
    display: flex;
    max-width: 600px;
    margin: 0 auto;
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}
.hero-search input {
    flex:1;
    border:none;
    outline:none;
    padding: 0.875rem 1.25rem;
    font-size: 1rem;
    font-family: var(--font-body);
    color: var(--color-text);
    background: transparent;
}
.hero-search button {
    padding: 0.875rem 1.5rem;
    background: var(--color-primary);
    color: #fff;
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: background var(--transition-fast);
    white-space: nowrap;
}
.hero-search button:hover { background: var(--color-primary-dark); }

/* ── Sección genérica ────────────────────────────────── */
.section { padding: 3rem 0; }
.section-title {
    font-size: clamp(1.375rem, 2.5vw, 1.875rem);
    margin-bottom: 0.5rem;
    font-weight: 700;
}
.section-subtitle { color: var(--color-text-muted); margin-bottom: 2rem; }
.section-header { display:flex; align-items:center; justify-content:space-between; margin-bottom:1.75rem; flex-wrap:wrap; gap:1rem; }

/* ── Grid de cards ───────────────────────────────────── */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}
@media(min-width:640px){ .cards-grid { grid-template-columns: repeat(3, 1fr); } }
@media(min-width:1024px){ .cards-grid { grid-template-columns: repeat(4, 1fr); gap: 1.25rem; } }

/* Card de solucionario */
.sol-card { display:flex; flex-direction:column; }
.sol-card__img-wrap {
    aspect-ratio: 3/4;
    overflow: hidden;
    background: #F1F5F9;
    position: relative;
}
.sol-card__img-wrap img { width:100%; height:100%; object-fit:cover; transition:transform var(--transition-slow); }
.sol-card:hover .sol-card__img-wrap img { transform:scale(1.04); }
.sol-card__img-placeholder {
    width:100%; height:100%;
    display:flex; align-items:center; justify-content:center;
    background: linear-gradient(135deg, #E0E7FF, #EDE9FE);
    color:#6366F1;
    font-size:3rem;
}
.sol-card__body { padding:0.875rem; flex:1; display:flex; flex-direction:column; gap:0.375rem; }
.sol-card__badges { display:flex; flex-wrap:wrap; gap:0.25rem; }
.sol-card__title { font-size:0.875rem; font-weight:600; color:var(--color-text); line-height:1.4; flex:1; }
.sol-card__title a { color:inherit; }
.sol-card__title a:hover { color:var(--color-primary); }
.sol-card__meta { font-size:0.75rem; color:var(--color-text-muted); }
.sol-card__footer { padding:0.75rem 0.875rem; border-top:1px solid var(--color-border); display:flex; align-items:center; justify-content:space-between; }

/* Cards de nivel */
.nivel-card {
    display:flex; flex-direction:column; align-items:center; justify-content:center;
    padding:1.5rem 1rem; text-align:center; gap:0.75rem;
    border-radius:var(--radius-md);
    background:var(--color-card-bg);
    border:1px solid var(--color-border);
    box-shadow:var(--shadow-sm);
    transition:all var(--transition-normal);
    text-decoration:none; color:var(--color-text);
}
.nivel-card:hover { transform:translateY(-3px); box-shadow:var(--shadow-lg); border-color:var(--color-primary); color:var(--color-primary); }
.nivel-card__icon { width:48px; height:48px; border-radius:var(--radius-md); display:flex; align-items:center; justify-content:center; font-size:1.5rem; }
.nivel-card__name { font-weight:600; font-size:0.9375rem; }
.nivel-card__count { font-size:0.75rem; color:var(--color-text-muted); }

/* Grid de niveles */
.niveles-grid {
    display:grid;
    grid-template-columns: repeat(2,1fr);
    gap:1rem;
}
@media(min-width:480px){ .niveles-grid { grid-template-columns: repeat(3,1fr); } }
@media(min-width:1024px){ .niveles-grid { grid-template-columns: repeat(6,1fr); } }

/* ── Asignaturas chips ───────────────────────────────── */
.asignaturas-chips { display:flex; flex-wrap:wrap; gap:0.5rem; }
.asig-chip {
    display:inline-flex; align-items:center; gap:0.375rem;
    padding:0.5rem 1rem;
    background:var(--color-card-bg);
    border:1px solid var(--color-border);
    border-radius:var(--radius-full);
    font-size:0.875rem; font-weight:500;
    color:var(--color-text);
    transition:all var(--transition-fast);
    text-decoration:none;
}
.asig-chip:hover { background:var(--color-primary); border-color:var(--color-primary); color:#fff; }
.asig-chip__count { font-size:0.75rem; color:var(--color-text-muted); }
.asig-chip:hover .asig-chip__count { color:rgba(255,255,255,0.8); }

/* ── Breadcrumb ──────────────────────────────────────── */
.breadcrumb { display:flex; align-items:center; flex-wrap:wrap; gap:0.25rem; font-size:0.8125rem; color:var(--color-text-muted); padding:0.75rem 0; }
.breadcrumb a { color:var(--color-text-muted); }
.breadcrumb a:hover { color:var(--color-primary); }
.breadcrumb__sep { opacity:0.5; }

/* ── Paginación ──────────────────────────────────────── */
.pagination { display:flex; align-items:center; justify-content:center; gap:0.375rem; padding:2rem 0; flex-wrap:wrap; }
.page-link {
    display:flex; align-items:center; justify-content:center;
    width:38px; height:38px;
    border-radius:var(--radius-sm);
    border:1px solid var(--color-border);
    font-size:0.875rem; font-weight:500;
    color:var(--color-text);
    transition:all var(--transition-fast);
    text-decoration:none;
}
.page-link:hover { border-color:var(--color-primary); color:var(--color-primary); }
.page-link.active { background:var(--color-primary); border-color:var(--color-primary); color:#fff; }
.page-link.disabled { opacity:0.4; pointer-events:none; }

/* ── Formularios ─────────────────────────────────────── */
.form-group { display:flex; flex-direction:column; gap:0.375rem; }
.form-label { font-size:0.875rem; font-weight:500; color:var(--color-text); }
.form-control {
    width:100%; padding:0.625rem 0.875rem;
    border:1.5px solid var(--color-border);
    border-radius:var(--radius-sm);
    font-size:0.9375rem; font-family:var(--font-body);
    color:var(--color-text);
    background:#fff;
    transition:border-color var(--transition-fast), box-shadow var(--transition-fast);
    outline:none;
    min-height:44px;
}
.form-control:focus { border-color:var(--color-primary); box-shadow:0 0 0 3px rgba(59,130,246,0.15); }
.form-control.error { border-color:var(--color-danger); }
.form-hint { font-size:0.75rem; color:var(--color-text-muted); }
.form-error { font-size:0.75rem; color:var(--color-danger); }
textarea.form-control { resize:vertical; min-height:120px; }
select.form-control { cursor:pointer; }

/* ── Toast notifications ─────────────────────────────── */
.toast-container { position:fixed; bottom:1.5rem; right:1.5rem; z-index:var(--z-toast); display:flex; flex-direction:column; gap:0.5rem; }
.toast {
    display:flex; align-items:center; gap:0.75rem;
    padding:0.875rem 1.25rem;
    background:#fff; border-radius:var(--radius-md);
    box-shadow:var(--shadow-lg);
    border-left:4px solid var(--color-primary);
    min-width:280px; max-width:380px;
    animation:slideInToast 0.3s ease;
    font-size:0.875rem;
}
.toast.success { border-color:var(--color-secondary); }
.toast.error   { border-color:var(--color-danger); }
.toast.warning { border-color:var(--color-accent); }
@keyframes slideInToast { from { transform:translateX(100%); opacity:0; } to { transform:translateX(0); opacity:1; } }

/* ── AdSense containers ──────────────────────────────── */
.ad-container { text-align:center; padding:0.5rem 0; overflow:hidden; }
.ad-label { font-size:0.6875rem; color:var(--color-text-muted); text-transform:uppercase; letter-spacing:0.05em; margin-bottom:0.25rem; }

/* ── Skeleton loader ─────────────────────────────────── */
.skeleton { background:linear-gradient(90deg,#f0f0f0 25%,#e0e0e0 50%,#f0f0f0 75%); background-size:200% 100%; animation:skeletonShimmer 1.5s infinite; border-radius:var(--radius-sm); }
@keyframes skeletonShimmer { 0%{background-position:200% 0} 100%{background-position:-200% 0} }

/* ── Utilidades ──────────────────────────────────────── */
.text-center { text-align:center; }
.text-muted  { color:var(--color-text-muted); }
.text-sm     { font-size:0.875rem; }
.text-xs     { font-size:0.75rem; }
.font-bold   { font-weight:700; }
.font-semibold { font-weight:600; }
.mt-1 { margin-top:0.25rem; }
.mt-2 { margin-top:0.5rem; }
.mt-4 { margin-top:1rem; }
.mt-6 { margin-top:1.5rem; }
.mt-8 { margin-top:2rem; }
.mb-4 { margin-bottom:1rem; }
.mb-6 { margin-bottom:1.5rem; }
.mb-8 { margin-bottom:2rem; }
.gap-2 { gap:0.5rem; }
.gap-4 { gap:1rem; }
.flex { display:flex; }
.items-center { align-items:center; }
.justify-between { justify-content:space-between; }
.flex-wrap { flex-wrap:wrap; }
.sr-only { position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; }

/* ── Fade-in animación ───────────────────────────────── */
.fade-in { animation:fadeIn 0.5s ease both; }
@keyframes fadeIn { from{opacity:0;transform:translateY(12px)} to{opacity:1;transform:translateY(0)} }

/* ── Divider ─────────────────────────────────────────── */
.divider { border:none; border-top:1px solid var(--color-border); margin:2rem 0; }

/* ── Archive layout ──────────────────────────────────── */
.archive-layout {
    display:grid;
    grid-template-columns: 1fr;
    gap:1.5rem;
}
@media(min-width:1024px){
    .archive-layout { grid-template-columns: var(--sidebar-width) 1fr; }
}

/* ── Single page ─────────────────────────────────────── */
.single-header {
    display:grid;
    grid-template-columns:1fr;
    gap:1.5rem;
    margin-bottom:2rem;
}
@media(min-width:640px){
    .single-header { grid-template-columns:180px 1fr; }
}

/* ── Cookie banner ───────────────────────────────────── */
#cookie-banner {
    position:fixed; bottom:0; left:0; right:0;
    z-index:var(--z-modal);
    background:#1E293B;
    color:#E2E8F0;
    padding:1.25rem;
    box-shadow:0 -4px 20px rgba(0,0,0,0.3);
    transform:translateY(100%);
    transition:transform 0.4s ease;
}
#cookie-banner.visible { transform:translateY(0); }
#cookie-banner .banner-inner { max-width:var(--container-max); margin:0 auto; display:flex; align-items:center; gap:1.5rem; flex-wrap:wrap; justify-content:space-between; }
#cookie-banner p { font-size:0.875rem; line-height:1.6; flex:1; min-width:200px; }
#cookie-banner a { color:var(--color-primary); }
.cookie-actions { display:flex; gap:0.5rem; flex-wrap:wrap; }