/* ============================================================
   estilos.css — SantiEducadores | guias.santieducadores.com
   Paleta corporativa: Navy #344650 | Sky #12B5EC | Med #625AAF
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Sora:wght@300;400;500;600;700;800&family=IBM+Plex+Sans:ital,wght@0,300;0,400;0,500;0,600;1,400&display=swap');

/* ─── Variables ─────────────────────────────────────────── */
:root {
  --navy:        #344650;
  --navy-dark:   #1e2d38;
  --navy-light:  #4a6070;
  --sky:         #12B5EC;
  --sky-dark:    #0d8dba;
  --sky-light:   #5dcdf5;
  --med:         #625AAF;
  --med-dark:    #4a4488;
  --med-light:   #8880c8;
  --white:       #ffffff;
  --off-white:   #f4f7fa;
  --gray-100:    #eef2f6;
  --gray-200:    #dde4ec;
  --gray-400:    #9aaabb;
  --gray-600:    #5c6f7e;
  --text-main:   #1a2832;
  --text-muted:  #6b7f8e;
  --success:     #2ecc71;
  --danger:      #e74c3c;
  --warning:     #f39c12;

  --shadow-sm:   0 2px 8px rgba(52,70,80,.10);
  --shadow-md:   0 6px 24px rgba(52,70,80,.14);
  --shadow-lg:   0 16px 48px rgba(52,70,80,.18);
  --radius-sm:   6px;
  --radius-md:   12px;
  --radius-lg:   20px;
  --radius-xl:   32px;

  --font-display: 'Sora', sans-serif;
  --font-body:    'IBM Plex Sans', sans-serif;

  --header-h:    70px;
  --sidebar-w:   290px;
  --transition:  .22s cubic-bezier(.4,0,.2,1);
}

/* ─── Reset ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-main);
  background: var(--off-white);
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, select, textarea { font-family: inherit; }

/* ─── Scrollbar ──────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--gray-100); }
::-webkit-scrollbar-thumb { background: var(--sky); border-radius: 99px; }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky; top: 0; z-index: 900;
  height: var(--header-h);
  background: var(--navy-dark);
  display: flex; align-items: center;
  padding: 0 24px;
  gap: 16px;
  box-shadow: 0 2px 20px rgba(0,0,0,.3);
  border-bottom: 2px solid var(--sky);
}
.header-logo {
  height: 44px;
  width: auto;
  flex-shrink: 0;
}
.header-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -.01em;
  flex: 1;
  line-height: 1.2;
}
.header-title span { color: var(--sky); }
.header-subtitle {
  font-size: .72rem;
  color: var(--gray-400);
  font-weight: 400;
  display: block;
}
.hamburger {
  display: none;
  background: none; border: none; cursor: pointer;
  color: var(--white);
  font-size: 1.4rem;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.hamburger:hover { background: rgba(255,255,255,.1); }

/* ============================================================
   LAYOUT — SIDEBAR + MAIN
   ============================================================ */
.layout {
  display: flex;
  min-height: calc(100vh - var(--header-h));
}

/* SIDEBAR */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--white);
  border-right: 1px solid var(--gray-200);
  overflow-y: auto;
  position: sticky;
  top: var(--header-h);
  height: calc(100vh - var(--header-h));
  padding-bottom: 32px;
}
.sidebar-section { padding: 0; }
.sidebar-section-title {
  font-family: var(--font-display);
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--white);
  padding: 14px 20px 12px;
  display: flex; align-items: center; gap: 8px;
  position: relative;
  cursor: default;
}
.sidebar-section-title.plan-title { background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%); }
.sidebar-section-title.guia-title { background: linear-gradient(135deg, var(--med-dark) 0%, var(--med) 100%); }
.sidebar-section-title i { font-size: .9rem; opacity: .85; }

/* Nivel (categoría) */
.nav-nivel-btn {
  width: 100%;
  display: flex; align-items: center; justify-content: space-between;
  background: none; border: none; cursor: pointer;
  padding: 10px 20px;
  font-size: .88rem;
  font-weight: 600;
  color: var(--navy);
  transition: background var(--transition), color var(--transition);
  border-left: 3px solid transparent;
  text-align: left;
  gap: 8px;
}
.nav-nivel-btn:hover { background: var(--gray-100); color: var(--sky-dark); }
.nav-nivel-btn.active { background: var(--gray-100); border-left-color: var(--sky); color: var(--sky-dark); }
.nav-nivel-btn .chevron { font-size: .75rem; transition: transform var(--transition); flex-shrink: 0; }
.nav-nivel-btn.open .chevron { transform: rotate(180deg); }

/* Sub-categorías */
.nav-subcats {
  display: none;
  background: var(--off-white);
  border-top: 1px solid var(--gray-200);
  border-bottom: 1px solid var(--gray-200);
}
.nav-subcats.open { display: block; }
.nav-subcat-btn {
  width: 100%;
  display: block;
  background: none; border: none; cursor: pointer;
  padding: 8px 20px 8px 36px;
  font-size: .83rem;
  color: var(--text-muted);
  transition: all var(--transition);
  text-align: left;
  border-left: 3px solid transparent;
  position: relative;
}
.nav-subcat-btn::before {
  content: '';
  position: absolute; left: 20px; top: 50%;
  transform: translateY(-50%);
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--gray-400);
  transition: background var(--transition);
}
.nav-subcat-btn:hover { background: var(--gray-200); color: var(--navy); }
.nav-subcat-btn:hover::before { background: var(--sky); }
.nav-subcat-btn.active {
  background: var(--sky);
  color: var(--white);
  border-left-color: var(--sky-dark);
  font-weight: 600;
}
.nav-subcat-btn.active::before { background: var(--white); }

/* MAIN CONTENT */
.main-content {
  flex: 1;
  min-width: 0;
  padding: 32px 28px;
}

/* ============================================================
   BREADCRUMB
   ============================================================ */
.breadcrumb {
  display: flex; align-items: center; gap: 6px;
  font-size: .8rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--sky-dark); }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb .sep { color: var(--gray-400); }

/* ============================================================
   HERO / WELCOME
   ============================================================ */
.hero-welcome {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 50%, var(--med-dark) 100%);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  color: var(--white);
  position: relative;
  overflow: hidden;
  margin-bottom: 32px;
}
.hero-welcome::before {
  content: '';
  position: absolute; top: -60px; right: -60px;
  width: 300px; height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(18,181,236,.18) 0%, transparent 70%);
}
.hero-welcome::after {
  content: '';
  position: absolute; bottom: -40px; left: 60px;
  width: 200px; height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(98,90,175,.2) 0%, transparent 70%);
}
.hero-welcome h1 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 10px;
  position: relative; z-index: 1;
}
.hero-welcome h1 span { color: var(--sky-light); }
.hero-welcome p {
  font-size: .95rem;
  color: rgba(255,255,255,.75);
  max-width: 540px;
  position: relative; z-index: 1;
}
.hero-stats {
  display: flex; gap: 24px; margin-top: 28px; flex-wrap: wrap;
  position: relative; z-index: 1;
}
.hero-stat {
  background: rgba(255,255,255,.1);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: var(--radius-md);
  padding: 12px 20px;
  text-align: center;
  min-width: 90px;
}
.hero-stat .num { font-family: var(--font-display); font-size: 1.6rem; font-weight: 800; color: var(--sky-light); line-height: 1; }
.hero-stat .lbl { font-size: .72rem; color: rgba(255,255,255,.65); margin-top: 2px; }

/* ============================================================
   SECTION HEADING
   ============================================================ */
.section-heading {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 20px;
}
.section-heading .icon-badge {
  width: 44px; height: 44px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.icon-badge-plan { background: linear-gradient(135deg, var(--navy), var(--sky-dark)); color: var(--white); }
.icon-badge-guia { background: linear-gradient(135deg, var(--med-dark), var(--med-light)); color: var(--white); }
.section-heading h2 {
  font-family: var(--font-display);
  font-size: 1.2rem; font-weight: 700; color: var(--navy);
}
.section-heading .subcat-label {
  display: block; font-size: .8rem; color: var(--text-muted); font-weight: 400;
}

/* ============================================================
   ARCHIVO CARDS (Grid)
   ============================================================ */
.files-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 20px;
}

.file-card {
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex; flex-direction: column;
}
.file-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.file-card-header {
  padding: 18px 18px 14px;
  display: flex; align-items: flex-start; gap: 14px;
  flex: 1;
}
.file-icon {
  width: 52px; height: 52px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  color: var(--white);
  flex-shrink: 0;
}
.file-meta { flex: 1; min-width: 0; }
.file-title {
  font-family: var(--font-display);
  font-size: .92rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.3;
  margin-bottom: 5px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.file-desc {
  font-size: .8rem;
  color: var(--text-muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.file-badges {
  display: flex; gap: 6px; margin-top: 8px; flex-wrap: wrap;
}
.badge {
  font-size: .68rem; font-weight: 600;
  padding: 2px 8px;
  border-radius: 99px;
  text-transform: uppercase; letter-spacing: .04em;
}
.badge-ext    { background: #f0f4f8; color: var(--navy); }
.badge-size   { background: var(--gray-100); color: var(--text-muted); }
.badge-lock   { background: #fdf3e3; color: var(--warning); }
.badge-free   { background: #eafaf1; color: var(--success); }

.file-card-actions {
  padding: 12px 18px;
  background: var(--off-white);
  border-top: 1px solid var(--gray-200);
  display: flex; gap: 8px;
}

/* ─── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: .82rem; font-weight: 600;
  border: none; cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  line-height: 1;
}
.btn-sm { padding: 6px 12px; font-size: .78rem; }
.btn-lg { padding: 12px 24px; font-size: .95rem; }
.btn-icon-only { padding: 8px; }

.btn-sky {
  background: var(--sky);
  color: var(--white);
}
.btn-sky:hover { background: var(--sky-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(18,181,236,.35); }

.btn-navy {
  background: var(--navy);
  color: var(--white);
}
.btn-navy:hover { background: var(--navy-dark); transform: translateY(-1px); }

.btn-med {
  background: var(--med);
  color: var(--white);
}
.btn-med:hover { background: var(--med-dark); transform: translateY(-1px); }

.btn-outline {
  background: transparent;
  border: 1.5px solid var(--gray-400);
  color: var(--text-muted);
}
.btn-outline:hover { border-color: var(--sky); color: var(--sky-dark); background: rgba(18,181,236,.05); }

.btn-danger { background: var(--danger); color: var(--white); }
.btn-danger:hover { background: #c0392b; }
.btn-success { background: var(--success); color: var(--white); }
.btn-success:hover { background: #27ae60; }
.btn-warning { background: var(--warning); color: var(--white); }
.btn-warning:hover { background: #d68910; }

.btn:disabled { opacity: .5; cursor: not-allowed; transform: none !important; }

/* Bloque de acción con grow */
.file-card-actions .btn { flex: 1; justify-content: center; }

/* ============================================================
   MODAL — VISOR DE DOCUMENTOS
   ============================================================ */
.modal-overlay {
  position: fixed; inset: 0; z-index: 9999;
  background: rgba(18,24,30,.75);
  backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  padding: 16px;
  opacity: 0; pointer-events: none;
  transition: opacity var(--transition);
}
.modal-overlay.open { opacity: 1; pointer-events: all; }

.modal-box {
  background: var(--white);
  border-radius: var(--radius-lg);
  width: 100%; max-width: 940px;
  height: 88vh;
  display: flex; flex-direction: column;
  box-shadow: var(--shadow-lg);
  transform: scale(.96); transition: transform var(--transition);
  overflow: hidden;
}
.modal-overlay.open .modal-box { transform: scale(1); }

.modal-header {
  padding: 16px 20px;
  background: var(--navy-dark);
  color: var(--white);
  display: flex; align-items: center; gap: 12px;
  border-bottom: 2px solid var(--sky);
  flex-shrink: 0;
}
.modal-header h3 {
  font-family: var(--font-display);
  font-size: .95rem; font-weight: 700;
  flex: 1; min-width: 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.modal-close {
  background: rgba(255,255,255,.12); border: none; cursor: pointer;
  color: var(--white); font-size: 1.1rem;
  width: 34px; height: 34px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition);
  flex-shrink: 0;
}
.modal-close:hover { background: rgba(255,255,255,.22); }

.modal-body { flex: 1; overflow: hidden; }
.modal-body iframe {
  width: 100%; height: 100%; border: none; display: block;
}
.modal-unsupported {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  height: 100%; gap: 16px; color: var(--text-muted); text-align: center; padding: 32px;
}
.modal-unsupported i { font-size: 3rem; color: var(--gray-400); }

.modal-footer {
  padding: 12px 20px;
  background: var(--off-white);
  border-top: 1px solid var(--gray-200);
  display: flex; align-items: center; gap: 10px;
  flex-shrink: 0;
}

/* ============================================================
   ESTADO VACÍO / LOADING
   ============================================================ */
.empty-state {
  text-align: center; padding: 64px 32px; color: var(--text-muted);
}
.empty-state i { font-size: 3.5rem; color: var(--gray-200); display: block; margin-bottom: 16px; }
.empty-state h3 { font-family: var(--font-display); font-size: 1.1rem; color: var(--navy); margin-bottom: 6px; }

.loading-spinner {
  display: flex; align-items: center; justify-content: center;
  padding: 48px; color: var(--sky);
}
.loading-spinner i { font-size: 2rem; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   TOAST NOTIFICATIONS
   ============================================================ */
.toast-container {
  position: fixed; bottom: 24px; right: 24px; z-index: 99999;
  display: flex; flex-direction: column; gap: 8px;
  max-width: 360px;
}
.toast {
  background: var(--navy-dark);
  color: var(--white);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  font-size: .85rem;
  display: flex; align-items: center; gap: 10px;
  box-shadow: var(--shadow-md);
  border-left: 4px solid var(--sky);
  animation: toast-in .3s ease;
}
.toast.success { border-left-color: var(--success); }
.toast.error   { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }
@keyframes toast-in {
  from { transform: translateX(110%); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--navy-dark);
  color: rgba(255,255,255,.55);
  text-align: center;
  padding: 20px;
  font-size: .78rem;
  border-top: 2px solid var(--sky);
  margin-top: auto;
}
.site-footer a { color: var(--sky-light); }

/* ============================================================
   ADMIN PANEL STYLES
   ============================================================ */
.admin-body {
  background: var(--off-white);
  min-height: 100vh;
}

.admin-header {
  background: linear-gradient(135deg, var(--navy-dark), var(--navy));
  border-bottom: 2px solid var(--sky);
  padding: 0 28px;
  height: 62px;
  display: flex; align-items: center; gap: 16px;
  position: sticky; top: 0; z-index: 900;
}
.admin-header .logo { height: 38px; }
.admin-header h1 {
  font-family: var(--font-display);
  font-size: 1rem; font-weight: 700; color: var(--white); flex: 1;
}
.admin-header h1 span { color: var(--sky); }

.admin-nav {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  padding: 0 28px;
  display: flex; gap: 0;
  overflow-x: auto;
}
.admin-nav-btn {
  background: none; border: none; cursor: pointer;
  padding: 14px 18px;
  font-size: .85rem; font-weight: 600;
  color: var(--text-muted);
  display: flex; align-items: center; gap: 7px;
  border-bottom: 3px solid transparent;
  transition: all var(--transition);
  white-space: nowrap;
}
.admin-nav-btn:hover { color: var(--sky); }
.admin-nav-btn.active { color: var(--sky-dark); border-bottom-color: var(--sky); }

.admin-main { padding: 28px; max-width: 1200px; margin: 0 auto; }

/* Cards / panels admin */
.admin-card {
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
  overflow: hidden;
  margin-bottom: 24px;
}
.admin-card-header {
  padding: 16px 20px;
  background: var(--off-white);
  border-bottom: 1px solid var(--gray-200);
  display: flex; align-items: center; gap: 10px;
}
.admin-card-header h2 {
  font-family: var(--font-display);
  font-size: 1rem; font-weight: 700; color: var(--navy); flex: 1;
}
.admin-card-body { padding: 20px; }

/* Formularios */
.form-group { margin-bottom: 18px; }
.form-label {
  display: block;
  font-size: .82rem; font-weight: 600;
  color: var(--navy); margin-bottom: 6px;
}
.form-label .req { color: var(--danger); margin-left: 2px; }
.form-control {
  width: 100%;
  padding: 9px 14px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: .88rem;
  color: var(--text-main);
  background: var(--white);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-control:focus {
  outline: none;
  border-color: var(--sky);
  box-shadow: 0 0 0 3px rgba(18,181,236,.12);
}
textarea.form-control { resize: vertical; min-height: 80px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* Checkbox toggle */
.toggle-wrap {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 0;
}
.toggle {
  position: relative; width: 44px; height: 24px; flex-shrink: 0;
}
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute; inset: 0; cursor: pointer;
  background: var(--gray-400); border-radius: 99px;
  transition: background var(--transition);
}
.toggle-slider::before {
  content: ''; position: absolute;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--white); left: 3px; top: 3px;
  transition: transform var(--transition);
  box-shadow: 0 2px 4px rgba(0,0,0,.2);
}
.toggle input:checked + .toggle-slider { background: var(--sky); }
.toggle input:checked + .toggle-slider::before { transform: translateX(20px); }
.toggle-label { font-size: .85rem; color: var(--text-main); }

/* Tabla admin */
.admin-table { width: 100%; border-collapse: collapse; }
.admin-table th {
  background: var(--off-white);
  padding: 10px 14px;
  text-align: left;
  font-size: .78rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .06em;
  color: var(--navy);
  border-bottom: 2px solid var(--gray-200);
}
.admin-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--gray-200);
  font-size: .85rem;
  vertical-align: middle;
}
.admin-table tr:hover td { background: var(--off-white); }
.admin-table .td-title { font-weight: 600; color: var(--navy); max-width: 220px; }
.admin-table .td-title small { display: block; font-size: .75rem; color: var(--text-muted); font-weight: 400; }
.admin-table .actions { display: flex; gap: 6px; }

/* Paginación */
.pagination {
  display: flex; align-items: center; gap: 6px;
  justify-content: center; padding: 16px 0 0;
}
.page-btn {
  width: 34px; height: 34px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  background: var(--white); cursor: pointer;
  font-size: .85rem; font-weight: 600; color: var(--navy);
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
}
.page-btn:hover { border-color: var(--sky); color: var(--sky); }
.page-btn.active { background: var(--sky); border-color: var(--sky); color: var(--white); }

/* Stats cards admin */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill,minmax(180px,1fr)); gap: 16px; margin-bottom: 28px; }
.stat-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
  border-top: 3px solid var(--sky);
}
.stat-card .s-num { font-family: var(--font-display); font-size: 2rem; font-weight: 800; color: var(--navy); line-height: 1; }
.stat-card .s-lbl { font-size: .8rem; color: var(--text-muted); margin-top: 4px; }

/* Login admin */
.login-page {
  min-height: 100vh;
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 60%, var(--med-dark) 100%);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
}
.login-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  width: 100%; max-width: 400px;
  box-shadow: var(--shadow-lg);
  text-align: center;
}
.login-card img { height: 70px; margin: 0 auto 24px; }
.login-card h2 {
  font-family: var(--font-display);
  font-size: 1.4rem; font-weight: 800; color: var(--navy); margin-bottom: 6px;
}
.login-card p { font-size: .85rem; color: var(--text-muted); margin-bottom: 28px; }
.login-error {
  background: #fdf3f2; border: 1px solid #f5c6c2; color: var(--danger);
  border-radius: var(--radius-sm); padding: 10px 14px;
  font-size: .83rem; margin-bottom: 16px; display: none;
}
.login-error.show { display: block; }

/* File drop zone */
.dropzone {
  border: 2px dashed var(--gray-400);
  border-radius: var(--radius-md);
  padding: 32px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--off-white);
}
.dropzone:hover, .dropzone.drag-over {
  border-color: var(--sky); background: rgba(18,181,236,.05);
}
.dropzone i { font-size: 2.5rem; color: var(--gray-400); margin-bottom: 10px; display: block; }
.dropzone p { font-size: .85rem; color: var(--text-muted); }
.dropzone strong { color: var(--sky); }
.dropzone input[type="file"] { display: none; }

/* Alert bar */
.alert {
  padding: 12px 16px; border-radius: var(--radius-sm);
  font-size: .85rem; display: flex; align-items: center; gap: 8px;
  margin-bottom: 16px;
}
.alert-success { background: #eafaf1; color: #1e8449; border: 1px solid #a9dfbf; }
.alert-error   { background: #fdf3f2; color: #c0392b; border: 1px solid #f5c6c2; }
.alert-info    { background: #eaf5fb; color: #1a6fa3; border: 1px solid #aed6f1; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  :root { --sidebar-w: 260px; }
}

@media (max-width: 768px) {
  .hamburger { display: flex; }

  .sidebar {
    position: fixed;
    top: var(--header-h); left: 0;
    z-index: 800;
    transform: translateX(-100%);
    transition: transform var(--transition);
    height: calc(100vh - var(--header-h));
    box-shadow: var(--shadow-lg);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay {
    position: fixed; inset: 0;
    z-index: 799;
    background: rgba(0,0,0,.4);
    display: none;
  }
  .sidebar-overlay.open { display: block; }

  .main-content { padding: 20px 16px; }
  .hero-welcome { padding: 32px 24px; }
  .files-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .admin-main { padding: 16px; }
  .admin-table { font-size: .8rem; }
  .admin-table th, .admin-table td { padding: 8px 10px; }
}

@media (max-width: 480px) {
  .hero-stats { gap: 12px; }
  .hero-stat  { min-width: 75px; padding: 10px 14px; }
  .modal-box  { height: 95vh; border-radius: var(--radius-md); }
  .login-card { padding: 36px 24px; }
}