/* ==========================================================================
   KAF · Kiosnkof Application Framework — Sistema CSS base
   Versión 1.0.0 · Design tokens, reset, componentes y utilidades mínimas.
   Sin dependencias externas. Soporta modo oscuro y preferencias de movimiento.
   ========================================================================== */

/* ---------- 1. Design tokens ---------- */
:root {
    color-scheme: light dark;

    --k-font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --k-mono: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;

    --k-bg: #f4f6fb;
    --k-surface: #ffffff;
    --k-surface-2: #f1f4f9;
    --k-border: #e3e8f0;
    --k-text: #0f172a;
    --k-text-muted: #5b6678;
    --k-night: #0b1220;

    --k-primary: #2557d6;
    --k-primary-hover: #1d47b3;
    --k-primary-soft: #e6edfd;
    --k-on-primary: #ffffff;
    --k-on-success: #ffffff;
    --k-on-danger: #ffffff;

    --k-success: #15803d;
    --k-success-soft: #e3f6ea;
    --k-warning: #b45309;
    --k-warning-soft: #fdf1dc;
    --k-danger: #c62828;
    --k-danger-soft: #fdebeb;
    --k-gold: #f2b01e;
    --k-gold-soft: #fff6db;
    --k-whatsapp: #1fa855;

    --k-r-sm: 8px;
    --k-r: 12px;
    --k-r-lg: 20px;
    --k-r-full: 999px;

    --k-shadow-sm: 0 1px 2px rgb(15 23 42 / 0.06);
    --k-shadow: 0 6px 20px rgb(15 23 42 / 0.08);
    --k-shadow-lg: 0 24px 60px rgb(15 23 42 / 0.18);

    --k-s1: 0.25rem; --k-s2: 0.5rem; --k-s3: 0.75rem; --k-s4: 1rem;
    --k-s5: 1.5rem; --k-s6: 2rem; --k-s7: 3rem; --k-s8: 4rem;

    --k-focus: 0 0 0 3px rgb(37 87 214 / 0.35);
    --k-ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
    :root {
        --k-bg: #0b1120;
        --k-surface: #121a2b;
        --k-surface-2: #182236;
        --k-border: #25314a;
        --k-text: #e6ebf5;
        --k-text-muted: #9aa6bd;
        --k-primary: #5b8cff;
        --k-primary-hover: #7aa2ff;
        --k-primary-soft: #1b2a4d;
        --k-on-primary: #0b1120;
        --k-on-success: #0b1120;
        --k-on-danger: #0b1120;
        --k-success: #4ade80;
        --k-success-soft: #12301f;
        --k-warning: #fbbf24;
        --k-warning-soft: #33270e;
        --k-danger: #f87171;
        --k-danger-soft: #3a1717;
        --k-gold-soft: #33290d;
        --k-shadow: 0 6px 20px rgb(0 0 0 / 0.35);
        --k-shadow-lg: 0 24px 60px rgb(0 0 0 / 0.55);
    }
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: var(--k-font);
    font-size: 1rem;
    line-height: 1.55;
    color: var(--k-text);
    background: var(--k-bg);
    -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
h1, h2, h3, h4, p { margin: 0; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; }
a { color: var(--k-primary); }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
[hidden] { display: none !important; }
:focus-visible { outline: none; box-shadow: var(--k-focus); }

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

/* ---------- 3. Accesibilidad ---------- */
.k-sr-only {
    position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.k-skip-link {
    position: absolute; left: var(--k-s4); top: -100px; z-index: 9999;
    background: var(--k-night); color: #fff; padding: var(--k-s2) var(--k-s4); border-radius: var(--k-r-sm);
}
.k-skip-link:focus { top: var(--k-s4); }

/* ---------- 4. Utilidades (regla KAF: solo patrones repetidos ≥ 3 veces) ---------- */
.k-container { width: min(1120px, 100% - 2rem); margin-inline: auto; }
.k-stack { display: flex; flex-direction: column; gap: var(--k-s4); }
.k-stack--tight { gap: var(--k-s2); }
.k-row { display: flex; flex-wrap: wrap; align-items: center; gap: var(--k-s3); }
.k-between { justify-content: space-between; }
.k-grow { flex: 1 1 auto; }
.k-muted { color: var(--k-text-muted); }
.k-small { font-size: 0.875rem; }
.k-center { text-align: center; }
.k-mono { font-family: var(--k-mono); }

/* ---------- 5. Botones ---------- */
.k-btn {
    --_bg: var(--k-surface-2); --_fg: var(--k-text); --_bd: var(--k-border);
    display: inline-flex; align-items: center; justify-content: center; gap: var(--k-s2);
    min-height: 44px; padding: 0.6rem 1.15rem;
    border: 1px solid var(--_bd); border-radius: var(--k-r-full);
    background: var(--_bg); color: var(--_fg);
    font-weight: 650; font-size: 0.95rem; line-height: 1.1; text-decoration: none; white-space: nowrap;
    transition: background-color 0.18s var(--k-ease), transform 0.18s var(--k-ease), box-shadow 0.18s var(--k-ease);
}
.k-btn:hover { filter: brightness(0.97); }
.k-btn:active { transform: translateY(1px); }
.k-btn:disabled, .k-btn[aria-disabled="true"] { opacity: 0.55; cursor: not-allowed; transform: none; }
.k-btn--primary { --_bg: var(--k-primary); --_fg: var(--k-on-primary); --_bd: transparent; }
.k-btn--primary:hover { --_bg: var(--k-primary-hover); filter: none; }
.k-btn--success { --_bg: var(--k-success); --_fg: var(--k-on-success); --_bd: transparent; }
.k-btn--danger { --_bg: var(--k-danger); --_fg: var(--k-on-danger); --_bd: transparent; }
.k-btn--warning { --_bg: var(--k-gold); --_fg: #1f1400; --_bd: transparent; }
.k-btn--whatsapp { --_bg: var(--k-whatsapp); --_fg: #fff; --_bd: transparent; }
.k-btn--dark { --_bg: var(--k-night); --_fg: #fff; --_bd: transparent; }
.k-btn--ghost { --_bg: transparent; --_bd: transparent; }
.k-btn--outline { --_bg: transparent; }
.k-btn--outline-danger { --_bg: transparent; --_fg: var(--k-danger); --_bd: currentColor; }
.k-btn--sm { min-height: 36px; padding: 0.4rem 0.85rem; font-size: 0.85rem; }
.k-btn--lg { min-height: 52px; padding: 0.85rem 1.6rem; font-size: 1.05rem; }
.k-btn--block { width: 100%; }
.k-btn--icon { width: 44px; padding: 0; }
.k-btn[aria-busy="true"] { position: relative; color: transparent !important; pointer-events: none; }
.k-btn[aria-busy="true"]::after {
    content: ""; position: absolute; width: 1.1em; height: 1.1em; border-radius: 50%;
    border: 2px solid var(--_fg); border-right-color: transparent; animation: k-spin 0.7s linear infinite;
}
@keyframes k-spin { to { transform: rotate(360deg); } }

/* ---------- 6. Tarjetas y superficies ---------- */
.k-card {
    background: var(--k-surface); border: 1px solid var(--k-border);
    border-radius: var(--k-r-lg); padding: var(--k-s5); box-shadow: var(--k-shadow-sm);
}
.k-card__title { font-size: 1.05rem; font-weight: 750; display: flex; align-items: center; gap: var(--k-s2); }
.k-card__subtitle { font-size: 0.875rem; color: var(--k-text-muted); margin-top: 2px; }

/* ---------- 7. Insignias y chips ---------- */
.k-badge {
    --_bg: var(--k-surface-2); --_fg: var(--k-text-muted);
    display: inline-flex; align-items: center; gap: 0.35rem; padding: 0.25rem 0.65rem;
    border-radius: var(--k-r-full); background: var(--_bg); color: var(--_fg);
    font-size: 0.78rem; font-weight: 700; line-height: 1.3; white-space: nowrap;
}
.k-badge--success { --_bg: var(--k-success-soft); --_fg: var(--k-success); }
.k-badge--warning { --_bg: var(--k-warning-soft); --_fg: var(--k-warning); }
.k-badge--danger { --_bg: var(--k-danger-soft); --_fg: var(--k-danger); }
.k-badge--primary { --_bg: var(--k-primary-soft); --_fg: var(--k-primary); }
.k-badge--gold { --_bg: var(--k-gold-soft); --_fg: #8a5a00; }
@media (prefers-color-scheme: dark) { .k-badge--gold { --_fg: var(--k-gold); } }

.k-chip {
    display: inline-flex; align-items: center; gap: var(--k-s2); min-height: 40px; padding: 0.45rem 1rem;
    border: 1px solid var(--k-border); border-radius: var(--k-r-full); background: var(--k-surface);
    font-weight: 650; font-size: 0.9rem; color: var(--k-text-muted);
    transition: background-color 0.18s, color 0.18s, border-color 0.18s;
}
.k-chip:hover { color: var(--k-text); }
.k-chip[aria-pressed="true"] { background: var(--k-night); border-color: var(--k-night); color: #fff; }
@media (prefers-color-scheme: dark) { .k-chip[aria-pressed="true"] { background: var(--k-primary); border-color: var(--k-primary); color: var(--k-on-primary); } }
.k-chip__count { font-size: 0.75rem; padding: 0 0.45rem; border-radius: var(--k-r-full); background: rgb(127 127 127 / 0.18); }

.k-dot { width: 0.65rem; height: 0.65rem; border-radius: 50%; display: inline-block; flex-shrink: 0; }

/* ---------- 8. Formularios ---------- */
.k-field { display: flex; flex-direction: column; gap: 0.4rem; }
.k-label { font-weight: 650; font-size: 0.9rem; }
.k-label small { font-weight: 400; color: var(--k-text-muted); }
.k-input, .k-select, .k-textarea {
    width: 100%; min-height: 46px; padding: 0.65rem 0.9rem;
    background: var(--k-surface); border: 1px solid var(--k-border); border-radius: var(--k-r);
    transition: border-color 0.15s, box-shadow 0.15s;
}
.k-textarea { min-height: 96px; resize: vertical; }
.k-input:focus, .k-select:focus, .k-textarea:focus { border-color: var(--k-primary); box-shadow: var(--k-focus); outline: none; }
.k-input[aria-invalid="true"], .k-select[aria-invalid="true"], .k-textarea[aria-invalid="true"] { border-color: var(--k-danger); }
.k-hint { font-size: 0.8rem; color: var(--k-text-muted); }
.k-error { font-size: 0.82rem; color: var(--k-danger); font-weight: 600; }
.k-error:empty { display: none; }
.k-input-group { display: flex; align-items: stretch; }
.k-input-group > :first-child { border-top-right-radius: 0; border-bottom-right-radius: 0; }
.k-input-group > :last-child { border-top-left-radius: 0; border-bottom-left-radius: 0; margin-left: -1px; }
.k-input-group__addon {
    display: grid; place-items: center; padding: 0 0.85rem; background: var(--k-surface-2);
    border: 1px solid var(--k-border); border-radius: var(--k-r); color: var(--k-text-muted); font-weight: 650;
}
.k-input-group .k-select { width: auto; max-width: 9.5rem; flex-shrink: 0; }

.k-check { display: flex; gap: var(--k-s3); align-items: flex-start; font-size: 0.875rem; cursor: pointer; }
.k-check input { width: 1.15rem; height: 1.15rem; margin-top: 0.15rem; accent-color: var(--k-primary); flex-shrink: 0; }

.k-switch { display: flex; align-items: center; gap: var(--k-s3); cursor: pointer; font-size: 0.9rem; }
.k-switch input {
    appearance: none; width: 2.6rem; height: 1.5rem; border-radius: var(--k-r-full); flex-shrink: 0;
    background: var(--k-border); position: relative; transition: background-color 0.2s; cursor: pointer; margin: 0;
}
.k-switch input::after {
    content: ""; position: absolute; top: 3px; left: 3px; width: 1.125rem; height: 1.125rem; border-radius: 50%;
    background: #fff; box-shadow: var(--k-shadow-sm); transition: transform 0.2s var(--k-ease);
}
.k-switch input:checked { background: var(--k-success); }
.k-switch input:checked::after { transform: translateX(1.1rem); }

/* ---------- 9. Alertas ---------- */
.k-alert {
    --_bg: var(--k-primary-soft); --_fg: var(--k-primary);
    display: flex; gap: var(--k-s3); align-items: flex-start; padding: var(--k-s3) var(--k-s4);
    border-radius: var(--k-r); background: var(--_bg); color: var(--k-text); border-left: 4px solid var(--_fg);
    font-size: 0.92rem;
}
.k-alert > i { color: var(--_fg); margin-top: 0.2rem; }
.k-alert--success { --_bg: var(--k-success-soft); --_fg: var(--k-success); }
.k-alert--warning { --_bg: var(--k-warning-soft); --_fg: var(--k-warning); }
.k-alert--danger { --_bg: var(--k-danger-soft); --_fg: var(--k-danger); }

/* ---------- 10. Progreso ---------- */
.k-progress {
    appearance: none; width: 100%; height: 0.6rem; border: 0; border-radius: var(--k-r-full);
    background: var(--k-surface-2); overflow: hidden; display: block;
}
.k-progress::-webkit-progress-bar { background: var(--k-surface-2); border-radius: var(--k-r-full); }
.k-progress::-webkit-progress-value { background: linear-gradient(90deg, var(--k-success), #22c55e); border-radius: var(--k-r-full); }
.k-progress::-moz-progress-bar { background: linear-gradient(90deg, var(--k-success), #22c55e); border-radius: var(--k-r-full); }

/* ---------- 11. Estadísticas ---------- */
.k-stat { padding: var(--k-s4); border-radius: var(--k-r); background: var(--k-surface-2); }
.k-stat__value { display: block; font-size: 1.6rem; font-weight: 800; line-height: 1.1; letter-spacing: -0.02em; }
.k-stat__label { display: block; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; font-weight: 700; color: var(--k-text-muted); margin-top: 0.25rem; }

/* ---------- 12. Diálogo nativo ---------- */
.k-dialog {
    width: min(520px, 100% - 1.5rem); max-height: calc(100dvh - 1.5rem); padding: 0; border: 0;
    border-radius: var(--k-r-lg); background: var(--k-surface); color: var(--k-text); box-shadow: var(--k-shadow-lg);
    overflow: auto;
}
.k-dialog::backdrop { background: rgb(8 12 24 / 0.62); backdrop-filter: blur(3px); }
.k-dialog[open] { animation: k-dialog-in 0.22s var(--k-ease); }
@keyframes k-dialog-in { from { opacity: 0; transform: translateY(14px) scale(0.98); } to { opacity: 1; transform: none; } }
.k-dialog__header { display: flex; align-items: flex-start; gap: var(--k-s3); padding: var(--k-s5) var(--k-s5) 0; }
.k-dialog__title { font-size: 1.25rem; font-weight: 800; }
.k-dialog__body { padding: var(--k-s4) var(--k-s5); display: flex; flex-direction: column; gap: var(--k-s4); }
.k-dialog__footer { padding: 0 var(--k-s5) var(--k-s5); display: flex; flex-wrap: wrap; gap: var(--k-s2); }
.k-dialog__footer > .k-btn { flex: 1 1 150px; }
.k-dialog__close { margin-left: auto; flex-shrink: 0; }
.k-dialog__icon {
    --_bg: var(--k-primary-soft); --_fg: var(--k-primary);
    width: 3.5rem; height: 3.5rem; border-radius: 50%; display: grid; place-items: center;
    background: var(--_bg); color: var(--_fg); font-size: 1.4rem; flex-shrink: 0;
}
.k-dialog__icon.success-icon { margin-inline: auto; width: 4.5rem; height: 4.5rem; font-size: 1.8rem; }
.k-dialog__icon--danger { --_bg: var(--k-danger-soft); --_fg: var(--k-danger); }
.k-dialog__icon--success { --_bg: var(--k-success-soft); --_fg: var(--k-success); }
.k-dialog__icon--warning { --_bg: var(--k-gold-soft); --_fg: var(--k-gold); }
@media (max-width: 575.98px) {
    .k-dialog { width: 100%; max-width: 100%; margin: auto 0 0; border-radius: var(--k-r-lg) var(--k-r-lg) 0 0; max-height: 92dvh; }
}

/* ---------- 13. Notificaciones (toast) ---------- */
.k-toast-region {
    position: fixed; inset: auto 0 var(--k-s4) 0; z-index: 3000; display: flex; flex-direction: column;
    align-items: center; gap: var(--k-s2); pointer-events: none; padding: 0 var(--k-s3);
}
.k-toast {
    pointer-events: auto; display: flex; align-items: center; gap: var(--k-s3); max-width: 480px;
    padding: 0.8rem 1.1rem; border-radius: var(--k-r); background: var(--k-night); color: #fff;
    box-shadow: var(--k-shadow-lg); font-size: 0.92rem; animation: k-toast-in 0.25s var(--k-ease);
}
.k-toast--success i { color: #4ade80; }
.k-toast--danger i { color: #f87171; }
.k-toast--warning i { color: #fbbf24; }
@keyframes k-toast-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* ---------- 14. Tablas ---------- */
.k-table-wrap { overflow-x: auto; border: 1px solid var(--k-border); border-radius: var(--k-r); }
.k-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.k-table th {
    text-align: left; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em;
    color: var(--k-text-muted); background: var(--k-surface-2); padding: 0.75rem 1rem; white-space: nowrap;
    position: sticky; top: 0; z-index: 1;
}
.k-table td { padding: 0.75rem 1rem; border-top: 1px solid var(--k-border); vertical-align: middle; }
.k-table tbody tr:hover { background: color-mix(in srgb, var(--k-primary-soft) 45%, transparent); }

/* ---------- 15. Estado vacío ---------- */
.k-empty { text-align: center; padding: var(--k-s7) var(--k-s4); color: var(--k-text-muted); }
.k-empty i { font-size: 2rem; margin-bottom: var(--k-s3); display: block; opacity: 0.6; }