/* ============================================================
   style.css — Estilos comunes TITSA Energía
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;500;600;700;800&display=swap');

/* ── VARIABLES ─────────────────────────────────────────────── */
:root {
  --color-dark:    #2A373B;
  --color-green:   #73B22A;
  --color-lime:    #C7D300;
  --color-bg:      #F8F8F6;
  --color-white:   #ffffff;
  --color-text:    #1a1a1a;
  --color-muted:   #666666;
  --color-border:  #e0e0dc;
  --color-error:   #c0392b;

  --radius-sm:  6px;
  --radius-md:  8px;
  --radius-lg:  12px;

  --shadow-card: 0 1px 4px rgba(0,0,0,0.06);

  --font: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100dvh;
}

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

button, input, select {
  font-family: var(--font);
  font-size: 1rem;
  border: none;
  outline: none;
  background: none;
  cursor: pointer;
}

/* ── UTILIDADES ─────────────────────────────────────────────── */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.hidden { display: none !important; }

/* ── BOTONES ─────────────────────────────────────────────────── */
.btn {
  display: block;
  width: 100%;
  padding: 13px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.03em;
  transition: opacity 0.15s, transform 0.1s;
}

.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--color-green);
  color: var(--color-white);
}

.btn-primary:hover { opacity: 0.9; }

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ── MENSAJES ────────────────────────────────────────────────── */
.msg-error {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-error);
  text-align: center;
  padding: 8px 0 0;
}

/* ── RESPONSIVE (tablet / desktop) ─────────────────────────── */
@media (min-width: 700px) {
  body { display: flex; flex-direction: column; align-items: center; justify-content: center; }
}