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

:root {
    --brand:        #2563eb;
    --brand-dark:   #1d4ed8;
    --brand-light:  #3b82f6;
    --brand-bg:     #eff6ff;
    --text:         #0f172a;
    --text-2:       #334155;
    --muted:        #64748b;
    --border:       #e2e8f0;
    --bg:           #f1f5f9;
    --surface:      #ffffff;
    --shadow-sm:    0 1px 3px rgba(0,0,0,.07), 0 1px 2px rgba(0,0,0,.04);
    --shadow-md:    0 4px 20px rgba(0,0,0,.08), 0 2px 6px rgba(0,0,0,.04);
    --r-lg:         16px;
    --r-md:         12px;
    --r-sm:         8px;
}

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 15px;
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    padding-bottom: 100px;
}

/* ─── HERO ───────────────────────────────────────────── */
.hero {
    background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 55%, #1d4ed8 100%);
    padding: 60px 24px 72px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* Dot grid pattern */
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(255,255,255,.05) 1px, transparent 1px);
    background-size: 26px 26px;
    pointer-events: none;
}

/* Decorative glow blobs */
.hero::after {
    content: '';
    position: absolute;
    bottom: -50px; left: 50%;
    transform: translateX(-50%);
    width: 900px; height: 100px;
    background: var(--bg);
    border-radius: 50%;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 620px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,.08);
    border: 1px solid rgba(255,255,255,.14);
    color: rgba(255,255,255,.8);
    padding: 5px 16px;
    border-radius: 100px;
    font-size: .75rem;
    font-weight: 600;
    letter-spacing: .06em;
    text-transform: uppercase;
    margin-bottom: 28px;
}

.badge-dot {
    width: 7px; height: 7px;
    background: #4ade80;
    border-radius: 50%;
    box-shadow: 0 0 8px #4ade80;
    animation: blink 2.4s ease-in-out infinite;
}
@keyframes blink {
    0%, 100% { opacity: 1; }
    50%       { opacity: .3; }
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 800;
    color: #fff;
    letter-spacing: -.03em;
    line-height: 1.12;
    margin-bottom: 20px;
}

.hero-accent {
    background: linear-gradient(90deg, #60a5fa 0%, #a78bfa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-sub {
    color: rgba(255,255,255,.6);
    font-size: .97rem;
    line-height: 1.75;
}

/* ─── MAIN ───────────────────────────────────────────── */
.main {
    max-width: 880px;
    margin: 0 auto;
    padding: 44px 16px 40px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* ─── DROP ZONE ──────────────────────────────────────── */
.drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--r-lg);
    background: var(--surface);
    cursor: pointer;
    position: relative;
    box-shadow: var(--shadow-sm);
    transition: border-color .2s, background .2s, box-shadow .2s, transform .2s;
    overflow: hidden;
}
.drop-zone:hover {
    border-color: var(--brand);
    background: var(--brand-bg);
    box-shadow: 0 0 0 4px rgba(37,99,235,.08), var(--shadow-md);
}
.drop-zone.drag-over {
    border-color: var(--brand);
    background: var(--brand-bg);
    transform: scale(1.01);
    box-shadow: 0 0 0 6px rgba(37,99,235,.12), var(--shadow-md);
}

.drop-zone input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
    width: 100%;
    height: 100%;
    font-size: 0;
}

.dz-content {
    padding: 72px 32px;
    text-align: center;
    pointer-events: none;
    transition: opacity .2s;
}

.dz-icon-wrap {
    display: inline-flex;
    margin-bottom: 28px;
    filter: drop-shadow(0 6px 16px rgba(37,99,235,.22));
    transition: transform .25s cubic-bezier(.34,1.56,.64,1);
}
.drop-zone:hover .dz-icon-wrap {
    transform: translateY(-6px);
}
.dz-icon { width: 80px; height: 80px; }

.dz-title {
    font-size: 1.45rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -.025em;
    margin-bottom: 10px;
}

.dz-sub {
    color: var(--muted);
    font-size: .95rem;
    margin-bottom: 22px;
}

.dz-badge {
    display: inline-block;
    background: #f1f5f9;
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 4px 16px;
    border-radius: 100px;
    font-size: .75rem;
    font-weight: 600;
    letter-spacing: .05em;
    text-transform: uppercase;
}

/* Loading state */
.dz-loading {
    padding: 72px 32px;
    text-align: center;
    pointer-events: none;
}
.spinner {
    width: 44px; height: 44px;
    border: 3px solid var(--border);
    border-top-color: var(--brand);
    border-radius: 50%;
    animation: spin .75s linear infinite;
    margin: 0 auto 20px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { color: var(--muted); font-size: .9rem; font-weight: 500; }

/* ─── SECTIONS CARD ──────────────────────────────────── */
.scard {
    background: var(--surface);
    border-radius: var(--r-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    animation: fadeUp .3s ease;
}
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(14px); }
    to   { opacity: 1; transform: translateY(0); }
}

.scard-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    background: #fafafa;
    border-bottom: 1px solid var(--border);
    gap: 12px;
    flex-wrap: wrap;
}

.file-info {
    display: flex;
    align-items: center;
    gap: 14px;
    min-width: 0;
}

.file-icon-box {
    width: 44px; height: 44px;
    background: var(--brand-bg);
    border-radius: 11px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    border: 1px solid rgba(37,99,235,.12);
}

.file-name {
    font-weight: 600;
    font-size: .93rem;
    color: var(--text);
    max-width: 380px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.file-meta {
    font-size: .78rem;
    color: var(--muted);
    margin-top: 2px;
}

.btn-cambiar {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
    background: var(--surface);
    color: var(--text-2);
    font-size: .82rem;
    font-weight: 500;
    cursor: pointer;
    transition: all .15s;
    font-family: inherit;
    white-space: nowrap;
    flex-shrink: 0;
}
.btn-cambiar:hover {
    border-color: var(--brand);
    color: var(--brand);
    background: var(--brand-bg);
}

/* Toolbar */
.scard-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    border-bottom: 1px solid var(--border);
    background: #fafafa;
    gap: 12px;
    flex-wrap: wrap;
}

.chips {
    display: flex;
    gap: 6px;
}
.chip {
    padding: 5px 14px;
    border-radius: 100px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--muted);
    font-size: .79rem;
    font-weight: 500;
    cursor: pointer;
    transition: all .15s;
    font-family: inherit;
}
.chip:hover {
    border-color: var(--brand);
    color: var(--brand);
    background: var(--brand-bg);
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}
.search-ico {
    position: absolute;
    left: 10px;
    width: 15px; height: 15px;
    pointer-events: none;
}
#filtro {
    padding: 7px 14px 7px 32px;
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
    font-size: .84rem;
    font-family: inherit;
    width: 220px;
    outline: none;
    background: var(--surface);
    color: var(--text);
    transition: border-color .15s, box-shadow .15s;
}
#filtro:focus {
    border-color: var(--brand);
    box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}
#filtro::placeholder { color: #94a3b8; }

/* Lista */
.lista {
    max-height: 460px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: #e2e8f0 transparent;
}
.lista::-webkit-scrollbar { width: 5px; }
.lista::-webkit-scrollbar-thumb { background: #e2e8f0; border-radius: 3px; }

.sec-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 9px 24px;
    cursor: pointer;
    border-bottom: 1px solid #f8fafc;
    position: relative;
    transition: background .08s;
}
.sec-item:last-child { border-bottom: none; }
.sec-item:hover { background: #f8fafc; }
.sec-item.is-checked { background: #eff6ff; }

/* Accent bar for level 1 */
.sec-item[data-level="1"]::before {
    content: '';
    position: absolute;
    left: 0; top: 7px; bottom: 7px;
    width: 3px;
    background: var(--brand);
    border-radius: 0 2px 2px 0;
    opacity: 0;
    transition: opacity .15s;
}
.sec-item[data-level="1"]:hover::before,
.sec-item[data-level="1"].is-checked::before { opacity: 1; }

/* Custom checkbox */
.sec-item input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 17px; height: 17px;
    min-width: 17px;
    border: 1.5px solid #cbd5e1;
    border-radius: 5px;
    cursor: pointer;
    position: relative;
    transition: all .15s;
    background: white;
    flex-shrink: 0;
}
.sec-item input[type="checkbox"]:hover { border-color: var(--brand); }
.sec-item input[type="checkbox"]:checked {
    background: var(--brand);
    border-color: var(--brand);
}
.sec-item input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    left: 4px; top: 1.5px;
    width: 5px; height: 9px;
    border: 2px solid white;
    border-top: none;
    border-left: none;
    transform: rotate(42deg);
}

.sec-text {
    font-size: .88rem;
    line-height: 1.45;
    color: var(--text-2);
    user-select: none;
}

/* Indentation */
.sec-item[data-level="1"]           { padding-left: 24px; }
.sec-item[data-level="1"] .sec-text { font-weight: 600; font-size: .93rem; color: var(--text); }
.sec-item[data-level="2"]           { padding-left: 46px; }
.sec-item[data-level="2"] .sec-text { font-weight: 500; }
.sec-item[data-level="3"]           { padding-left: 68px; }
.sec-item[data-level="3"] .sec-text { color: #475569; }
.sec-item[data-level="4"]           { padding-left: 88px; }
.sec-item[data-level="4"] .sec-text { color: var(--muted); font-size: .84rem; }
.sec-item[data-level="5"],
.sec-item[data-level="6"],
.sec-item[data-level="7"],
.sec-item[data-level="8"],
.sec-item[data-level="9"]           { padding-left: 108px; }
.sec-item[data-level="5"] .sec-text,
.sec-item[data-level="6"] .sec-text,
.sec-item[data-level="7"] .sec-text,
.sec-item[data-level="8"] .sec-text,
.sec-item[data-level="9"] .sec-text { color: #94a3b8; font-size: .82rem; }

/* ─── FOOTER BAR ─────────────────────────────────────── */
.footer-bar {
    position: fixed;
    bottom: 0; left: 0; right: 0;
    background: rgba(10,14,28,.97);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-top: 1px solid rgba(255,255,255,.07);
    padding: 14px 20px;
    z-index: 100;
}

.footer-inner {
    max-width: 880px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 16px;
}

.sel-count {
    font-size: .83rem;
    color: rgba(255,255,255,.5);
    white-space: nowrap;
    flex-shrink: 0;
    min-width: 160px;
}

.progress-wrap {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 12px;
}
.progress-track {
    flex: 1;
    height: 4px;
    background: rgba(255,255,255,.08);
    border-radius: 2px;
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #3b82f6, #818cf8);
    border-radius: 2px;
    animation: indeterminate 1.4s ease-in-out infinite;
}
@keyframes indeterminate {
    0%   { width: 0%;   margin-left: 0%; }
    50%  { width: 60%;  margin-left: 20%; }
    100% { width: 0%;   margin-left: 100%; }
}
#progress-label {
    font-size: .8rem;
    color: rgba(255,255,255,.5);
    white-space: nowrap;
}

.btn-generar {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 26px;
    background: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: .95rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity .15s, transform .15s, box-shadow .15s;
    font-family: inherit;
    white-space: nowrap;
    box-shadow: 0 4px 16px rgba(37,99,235,.45);
    flex-shrink: 0;
}
.btn-generar:hover:not(:disabled) {
    opacity: .92;
    transform: translateY(-1px);
    box-shadow: 0 6px 22px rgba(37,99,235,.55);
}
.btn-generar:active:not(:disabled) { transform: translateY(0); }
.btn-generar:disabled { opacity: .45; cursor: not-allowed; transform: none; }

/* ─── TOAST ──────────────────────────────────────────── */
.toast {
    position: fixed;
    bottom: 88px;
    left: 50%;
    transform: translateX(-50%);
    padding: 13px 22px;
    border-radius: 12px;
    font-size: .87rem;
    line-height: 1.55;
    max-width: 520px;
    width: calc(100% - 32px);
    text-align: center;
    z-index: 300;
    animation: toast-in .25s cubic-bezier(.34,1.56,.64,1);
    box-shadow: 0 12px 40px rgba(0,0,0,.28);
}
.toast.success { background: #052e16; color: #4ade80; border: 1px solid rgba(74,222,128,.2); }
.toast.error   { background: #450a0a; color: #f87171; border: 1px solid rgba(248,113,113,.2); }
.toast.info    { background: #1e293b; color: #94a3b8; border: 1px solid rgba(148,163,184,.12); }

@keyframes toast-in {
    from { opacity: 0; transform: translateX(-50%) translateY(14px) scale(.96); }
    to   { opacity: 1; transform: translateX(-50%) translateY(0)    scale(1); }
}

/* ─── DIÁLOGO NOMBRE ARCHIVO ─────────────────────────── */
.dialog-overlay {
    position: fixed;
    inset: 0;
    background: rgba(10,14,28,.6);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    z-index: 400;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    animation: overlay-in .2s ease;
}
@keyframes overlay-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.dialog {
    background: var(--surface);
    border-radius: var(--r-lg);
    padding: 28px 28px 24px;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 24px 64px rgba(0,0,0,.22);
    border: 1px solid var(--border);
    animation: dialog-in .25s cubic-bezier(.34,1.56,.64,1);
}
@keyframes dialog-in {
    from { opacity: 0; transform: scale(.94) translateY(10px); }
    to   { opacity: 1; transform: scale(1)   translateY(0); }
}

.dialog-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
}

.dialog-sub {
    font-size: .87rem;
    color: var(--muted);
    margin-bottom: 20px;
}

.dialog-input-wrap {
    display: flex;
    align-items: center;
    border: 1.5px solid var(--border);
    border-radius: var(--r-sm);
    overflow: hidden;
    transition: border-color .15s, box-shadow .15s;
    margin-bottom: 20px;
}
.dialog-input-wrap:focus-within {
    border-color: var(--brand);
    box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}

.dialog-input {
    flex: 1;
    padding: 10px 14px;
    border: none;
    outline: none;
    font-size: .93rem;
    font-family: inherit;
    color: var(--text);
    background: transparent;
}

.dialog-ext {
    padding: 10px 14px;
    background: #f8fafc;
    color: var(--muted);
    font-size: .85rem;
    font-weight: 500;
    border-left: 1px solid var(--border);
    white-space: nowrap;
}

.dialog-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.dialog-btn {
    padding: 9px 20px;
    border-radius: var(--r-sm);
    font-size: .9rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    font-family: inherit;
    transition: all .15s;
}

.dialog-btn-cancel {
    background: #f1f5f9;
    color: var(--text-2);
    border: 1px solid var(--border);
}
.dialog-btn-cancel:hover { background: var(--border); }

.dialog-btn-ok {
    background: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
    color: white;
    box-shadow: 0 3px 10px rgba(37,99,235,.35);
}
.dialog-btn-ok:hover { opacity: .9; transform: translateY(-1px); }

/* Resumen */
.resumen-stats {
    display: flex;
    align-items: center;
    gap: 0;
    background: var(--brand-bg);
    border: 1px solid rgba(37,99,235,.15);
    border-radius: var(--r-md);
    padding: 16px 24px;
    margin-bottom: 20px;
}
.resumen-stat {
    flex: 1;
    text-align: center;
}
.resumen-stat-num {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--brand);
    line-height: 1;
    letter-spacing: -.03em;
}
.resumen-stat-label {
    font-size: .78rem;
    color: var(--muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: .04em;
}
.resumen-divider {
    width: 1px;
    height: 40px;
    background: rgba(37,99,235,.15);
    margin: 0 8px;
}
.resumen-label {
    font-size: .82rem;
    font-weight: 600;
    color: var(--text-2);
    text-transform: uppercase;
    letter-spacing: .04em;
    margin-bottom: 8px;
}
.resumen-lista {
    list-style: none;
    max-height: 220px;
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: var(--r-sm);
    scrollbar-width: thin;
}
.resumen-item {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 7px 14px;
    font-size: .87rem;
    color: var(--text-2);
    border-bottom: 1px solid #f8fafc;
}
.resumen-item:last-child { border-bottom: none; }
.resumen-check {
    color: var(--brand);
    font-weight: 700;
    font-size: .8rem;
    flex-shrink: 0;
}
.resumen-nivel-1 { padding-left: 14px; font-weight: 600; color: var(--text); }
.resumen-nivel-2 { padding-left: 28px; }
.resumen-nivel-3 { padding-left: 42px; color: var(--muted); font-size: .83rem; }
.resumen-nivel-4 { padding-left: 56px; color: var(--muted); font-size: .81rem; }

.hidden { display: none !important; }