:root {
  --black: #0a0a0a;
  --white: #ffffff;
  --grey: #f5f5f5;
  --grey2: #e8e8e8;
  --grey3: #888888;
  --gold: #c9a96e;
  --gold-light: #f0e4c8;
  --font: 'Helvetica Neue', -apple-system, Helvetica, Arial, sans-serif;
  --max: 1100px;
  --radius: 6px;
  --transition: 0.22s ease;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--black); background: var(--white); line-height: 1.55; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ── HEADER ── */
.header {
  position: sticky; top: 0; z-index: 100;
  background: var(--white); border-bottom: 1px solid var(--grey2);
  height: 64px; display: flex; align-items: center;
}
.header-inner {
  max-width: var(--max); margin: 0 auto; padding: 0 24px;
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.logo { font-size: 22px; font-weight: 700; letter-spacing: -2px; }
.header-nav { display: flex; gap: 28px; }
.header-nav a { font-size: 13px; font-weight: 500; color: var(--grey3); transition: color var(--transition); }
.header-nav a:hover, .header-nav a.active { color: var(--black); }
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 22px; border-radius: var(--radius);
  font-size: 13px; font-weight: 600; cursor: pointer;
  border: none; transition: all var(--transition); white-space: nowrap;
}
.btn-dark { background: var(--black); color: var(--white); }
.btn-dark:hover { background: #222; }
.btn-gold { background: var(--gold); color: var(--white); }
.btn-gold:hover { background: #b8924f; }
.btn-outline { background: transparent; color: var(--black); border: 1.5px solid var(--black); }
.btn-outline:hover { background: var(--black); color: var(--white); }

/* ── HERO ── */
.hero {
  background:
    linear-gradient(rgba(10,10,10,0.75), rgba(10,10,10,0.75)),
    url('/img/fondo_unete.jpg') center/cover no-repeat;
  color: var(--white);
  padding: 100px 24px 90px; text-align: center;
  position: relative; overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 70% 50% at 50% 110%, rgba(201,169,110,0.15) 0%, transparent 70%);
  pointer-events: none;
}
.hero-label { font-size: 11px; font-weight: 600; letter-spacing: 3px; text-transform: uppercase; color: var(--gold); margin-bottom: 20px; }
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 700; letter-spacing: -2px; line-height: 1.08;
  max-width: 800px; margin: 0 auto 24px;
}
.hero-sub {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: rgba(255,255,255,0.55); max-width: 580px;
  margin: 0 auto 44px; line-height: 1.6;
}
.hero-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero-stats {
  display: flex; justify-content: center; gap: 56px;
  margin-top: 64px; flex-wrap: wrap;
}
.hero-stat-num { font-size: 2.2rem; font-weight: 700; letter-spacing: -1px; color: var(--gold); }
.hero-stat-label { font-size: 12px; color: rgba(255,255,255,0.4); margin-top: 3px; }

/* ── SECTIONS ── */
.section { padding: 90px 24px; }
.section-inner { max-width: var(--max); margin: 0 auto; }
.section-label { font-size: 11px; font-weight: 600; letter-spacing: 3px; text-transform: uppercase; color: var(--gold); margin-bottom: 12px; }
.section-title { font-size: clamp(1.8rem, 3.5vw, 2.8rem); font-weight: 700; letter-spacing: -1.2px; line-height: 1.1; margin-bottom: 16px; }
.section-sub { font-size: 1.05rem; color: var(--grey3); max-width: 560px; line-height: 1.65; margin-bottom: 48px; }
.bg-grey { background: var(--grey); }
.bg-black { background: var(--black); color: var(--white); }
.bg-black .section-title { color: var(--white); }
.bg-black .section-sub { color: rgba(255,255,255,0.5); }

/* ── POR QUÉ KDF — 4 bloques ── */
.reasons-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 2px;
  background: var(--grey2); border-radius: 10px; overflow: hidden;
}
.reason-card { background: var(--white); padding: 40px 36px; }
.reason-icon {
  width: 48px; height: 48px; border-radius: 10px;
  background: var(--gold-light); display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
}
.reason-icon svg { stroke: var(--gold); }
.reason-title { font-size: 1.15rem; font-weight: 700; letter-spacing: -0.4px; margin-bottom: 10px; }
.reason-desc { font-size: 0.9rem; color: var(--grey3); line-height: 1.65; }
.reason-highlight { font-size: 1.6rem; font-weight: 700; letter-spacing: -1px; color: var(--gold); margin-bottom: 6px; }

/* ── DÍA A DÍA ── */
.dia-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.dia-intro { font-size: 1.05rem; line-height: 1.75; color: var(--grey3); margin-bottom: 32px; }
.dia-intro strong { color: var(--black); font-weight: 600; }
.dia-list { display: flex; flex-direction: column; gap: 20px; }
.dia-item { display: flex; gap: 16px; align-items: flex-start; }
.dia-num {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--black); color: var(--white);
  font-size: 12px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.dia-item-title { font-size: 0.95rem; font-weight: 700; margin-bottom: 4px; }
.dia-item-desc { font-size: 0.875rem; color: var(--grey3); line-height: 1.6; }
.dia-card {
  background: var(--black); border-radius: 12px; padding: 36px; color: var(--white);
}
.dia-card-label { font-size: 11px; font-weight: 600; letter-spacing: 2px; text-transform: uppercase; color: var(--gold); margin-bottom: 16px; }
.dia-card-title { font-size: 1.3rem; font-weight: 700; letter-spacing: -0.5px; margin-bottom: 12px; }
.dia-card-text { font-size: 0.9rem; color: rgba(255,255,255,0.5); line-height: 1.7; margin-bottom: 24px; }
.dia-warning {
  background: rgba(201,169,110,0.12); border: 1px solid rgba(201,169,110,0.3);
  border-radius: 8px; padding: 16px 20px;
  font-size: 0.875rem; color: rgba(255,255,255,0.7); line-height: 1.6;
}
.dia-warning strong { color: var(--gold); }

/* ── REQUISITOS ── */
.req-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.req-item {
  display: flex; gap: 14px; align-items: flex-start;
  background: var(--white); border: 1px solid var(--grey2);
  border-radius: 8px; padding: 20px 24px;
}
.req-check {
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--black); display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; margin-top: 1px;
}
.req-check svg { stroke: var(--white); }
.req-item-title { font-size: 0.95rem; font-weight: 700; margin-bottom: 3px; }
.req-item-desc { font-size: 0.85rem; color: var(--grey3); line-height: 1.5; }
.req-nice { margin-top: 24px; padding: 20px 24px; background: var(--gold-light); border-radius: 8px; }
.req-nice-title { font-size: 12px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; color: var(--gold); margin-bottom: 10px; }
.req-nice p { font-size: 0.9rem; color: #7a6035; line-height: 1.6; }

/* ── CALCULADORA ── */
.calc-box {
  background: var(--white); border: 1px solid var(--grey2);
  border-radius: 12px; padding: 48px; max-width: 700px;
  margin: 0 auto; box-shadow: 0 8px 40px rgba(0,0,0,0.06);
}
.calc-row { margin-bottom: 32px; }
.calc-label {
  font-size: 13px; font-weight: 600; letter-spacing: 0.5px; text-transform: uppercase;
  color: var(--grey3); margin-bottom: 12px;
  display: flex; justify-content: space-between; align-items: baseline;
}
.calc-val { font-size: 1.4rem; font-weight: 700; letter-spacing: -0.8px; color: var(--black); }
.calc-slider {
  width: 100%; height: 4px; -webkit-appearance: none; appearance: none;
  background: var(--grey2); border-radius: 2px; outline: none; cursor: pointer;
  margin-top: 12px;
}
.calc-slider::-webkit-slider-thumb {
  -webkit-appearance: none; width: 22px; height: 22px; border-radius: 50%;
  background: var(--gold); border: 3px solid var(--white);
  box-shadow: 0 2px 8px rgba(201,169,110,0.5); cursor: pointer;
}
.calc-slider::-moz-range-thumb {
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--gold); border: 3px solid var(--white); cursor: pointer;
}
.calc-range-labels { display: flex; justify-content: space-between; font-size: 11px; color: var(--grey3); margin-top: 6px; }
.calc-divider { height: 1px; background: var(--grey2); margin: 32px 0; }
.calc-result-main {
  text-align: center; padding: 36px 24px;
  background: var(--black); border-radius: 10px;
}
.calc-result-label { font-size: 11px; font-weight: 600; letter-spacing: 2px; text-transform: uppercase; color: rgba(255,255,255,0.4); margin-bottom: 12px; }
.calc-result-value { font-size: clamp(2.5rem, 6vw, 4rem); font-weight: 700; letter-spacing: -2px; color: var(--gold); }
.calc-result-sub { font-size: 13px; color: rgba(255,255,255,0.35); margin-top: 8px; }
.calc-breakdown {
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; margin-top: 16px;
}
.calc-bd-item { background: var(--grey); border-radius: 6px; padding: 14px 16px; text-align: center; }
.calc-bd-num { font-size: 1.1rem; font-weight: 700; letter-spacing: -0.5px; }
.calc-bd-label { font-size: 11px; color: var(--grey3); margin-top: 3px; }

/* ── PROCESO DE SELECCIÓN ── */
.process-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px;
  background: var(--grey2); border-radius: 10px; overflow: hidden;
}
.process-card { background: var(--black); padding: 40px 32px; color: var(--white); }
.process-num {
  font-size: 3rem; font-weight: 700; letter-spacing: -2px;
  color: rgba(201,169,110,0.25); line-height: 1; margin-bottom: 20px;
}
.process-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 10px; color: var(--white); }
.process-desc { font-size: 0.875rem; color: rgba(255,255,255,0.45); line-height: 1.65; }
.process-badge {
  display: inline-block; margin-top: 16px;
  font-size: 10px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase;
  color: var(--gold); border: 1px solid rgba(201,169,110,0.4);
  padding: 4px 10px; border-radius: 3px;
}

/* ── FORMULARIO ── */
.form-wrapper {
  background: var(--white); border-radius: 12px; padding: 48px;
  max-width: 680px; margin: 0 auto;
  box-shadow: 0 8px 40px rgba(0,0,0,0.08);
}
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group.full { grid-column: 1 / -1; }
.form-group label { font-size: 12px; font-weight: 600; letter-spacing: 0.5px; text-transform: uppercase; color: var(--grey3); }
.form-group input,
.form-group select,
.form-group textarea {
  padding: 12px 16px; border: 1.5px solid var(--grey2);
  border-radius: var(--radius); font-family: var(--font); font-size: 15px;
  background: var(--white); color: var(--black); outline: none;
  transition: border-color var(--transition); width: 100%;
}
.form-group textarea { resize: vertical; min-height: 110px; }
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { border-color: var(--black); }
.form-submit-row { grid-column: 1 / -1; margin-top: 8px; }
.form-msg { grid-column: 1 / -1; padding: 14px 18px; border-radius: var(--radius); font-size: 14px; display: none; }
.form-msg.ok { background: #d4edda; color: #155724; }
.form-msg.err { background: #f8d7da; color: #721c24; }

/* ── TESTIMONIOS ── */
.testi-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.testi-card {
  background: var(--white); border: 1px solid var(--grey2);
  border-radius: 10px; padding: 28px 24px;
  display: flex; flex-direction: column; gap: 16px;
}
.testi-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--grey2); display: flex; align-items: center; justify-content: center;
  font-size: 16px; font-weight: 700; color: var(--grey3);
}
.testi-text { font-size: 0.9rem; color: var(--grey3); line-height: 1.65; font-style: italic; }
.testi-name { font-size: 13px; font-weight: 700; }
.testi-meta { font-size: 12px; color: var(--grey3); }
.testi-placeholder {
  background: var(--grey); border: none;
  display: flex; align-items: center; justify-content: center; min-height: 160px;
}

/* ── FOOTER ── */
.footer { background: var(--black); color: var(--white); padding: 40px 24px; text-align: center; }
.footer-inner { max-width: var(--max); margin: 0 auto; display: flex; flex-direction: column; gap: 16px; align-items: center; }
.footer-logo { font-size: 20px; font-weight: 700; letter-spacing: -2px; }
.footer-copy { font-size: 12px; color: rgba(255,255,255,0.3); }
.footer-links { display: flex; gap: 24px; flex-wrap: wrap; justify-content: center; }
.footer-links a { font-size: 12px; color: rgba(255,255,255,0.35); transition: color var(--transition); }
.footer-links a:hover { color: rgba(255,255,255,0.7); }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .header-nav { display: none; }
  .hero { padding: 64px 20px 56px; }
  .hero h1 { font-size: clamp(1.9rem, 7vw, 2.6rem); }
  .hero-stats { gap: 28px; }
  .section { padding: 56px 20px; }
  .reasons-grid { grid-template-columns: 1fr; }
  .dia-grid { grid-template-columns: 1fr; }
  .req-grid { grid-template-columns: 1fr; }
  .calc-box { padding: 28px 20px; }
  .calc-breakdown { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr; }
  .testi-grid { grid-template-columns: 1fr; }
  .form-wrapper { padding: 28px 20px; }
  .form-grid { grid-template-columns: 1fr; }
  .btn { width: 100%; justify-content: center; }
  input, select, textarea { font-size: 16px; }
}