/* ============================================================
   presupuesto.css — Cold Hub · Formulario de Presupuesto
   ============================================================ */

:root {
  --clr-bg:           #060e1b;
  --clr-surface:      rgba(255,255,255,0.04);
  --clr-border:       rgba(255,255,255,0.07);
  --clr-border-hover: rgba(255,255,255,0.14);
  --clr-primary:      #1779f5;
  --clr-primary-h:    #2f8bff;
  --clr-accent:       #52c4f0;
  --clr-accent-dim:   rgba(82,196,240,0.15);
  --clr-text:         #f0f4ff;
  --clr-muted:        #94a3b8;
  --clr-dim:          #cbd5e1;
  --clr-error:        #f87171;
  --clr-error-dim:    rgba(248,113,113,0.12);

  --font-display:     'Syne', sans-serif;
  --font-body:        'DM Sans', sans-serif;

  --nav-height:       80px;
  --radius-sm:        10px;
  --radius-md:        18px;
  --radius-lg:        26px;
  --radius-xl:        36px;

  --ease:             cubic-bezier(0.4,0,0.2,1);
  --transition:       0.3s var(--ease);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background:  var(--clr-bg);
  color:       var(--clr-text);
  overflow-x:  hidden;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a   { color: inherit; text-decoration: none; }
button { font-family: var(--font-body); }

/* Ambient glows */
body::before, body::after {
  content: ''; position: fixed; border-radius: 50%;
  pointer-events: none; z-index: -1;
}
body::before {
  width: 900px; height: 900px;
  background: radial-gradient(circle, rgba(23,121,245,0.14) 0%, transparent 70%);
  top: -300px; left: -300px;
}
body::after {
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(82,196,240,0.08) 0%, transparent 70%);
  bottom: -200px; right: -200px;
}

/* Utility */
.glass {
  background:      var(--clr-surface);
  border:          1px solid var(--clr-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}
.section-tag {
  color: var(--clr-accent);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2.5px;
  text-transform: uppercase;
}

/* Reveal */
[data-reveal] {
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
[data-reveal].revealed { opacity: 1; transform: translateY(0); }
[data-reveal][data-delay="100"] { transition-delay: 0.1s; }
[data-reveal][data-delay="200"] { transition-delay: 0.2s; }

/* Spinner */
.btn-spinner {
  display: inline-block;
  width: 16px; height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin-right: 8px;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ═══════════════════════════════════════════════════════════
   NAVBAR
════════════════════════════════════════════════════════════ */
.navbar {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-height);
  padding: 0 60px;
  display: flex; align-items: center;
  justify-content: space-between; gap: 40px;
  background: rgba(6,14,27,0.5);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: background var(--transition), box-shadow var(--transition);
}
.navbar.scrolled {
  background: rgba(6,14,27,0.92);
  box-shadow: 0 4px 40px rgba(0,0,0,0.4);
}
.logo img { height: 48px; width: auto; }

.nav-links { display: flex; align-items: center; gap: 36px; }
.nav-links a {
  font-size: 14px; font-weight: 500;
  color: rgba(255,255,255,0.7);
  transition: color var(--transition);
  position: relative;
}
.nav-links a::after {
  content: ''; position: absolute;
  bottom: -4px; left: 0; right: 100%;
  height: 1px; background: var(--clr-accent);
  transition: right var(--transition);
}
.nav-links a:hover { color: #fff; }
.nav-links a:hover::after { right: 0; }

.nav-back {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 20px;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  color: rgba(255,255,255,0.7);
  font-size: 14px; font-weight: 500;
  transition: background var(--transition), color var(--transition);
}
.nav-back:hover {
  background: rgba(255,255,255,0.06);
  color: white;
}

/* Hamburger */
.menu-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 8px;
}
.menu-toggle span {
  display: block; width: 24px; height: 2px;
  background: white; border-radius: 2px;
  transition: transform 0.35s var(--ease), opacity 0.25s;
}
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-overlay {
  position: fixed; inset: 0; z-index: 999;
  background: rgba(6,14,27,0.97);
  backdrop-filter: blur(20px);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 32px;
  opacity: 0; pointer-events: none;
  transition: opacity 0.35s var(--ease);
}
.mobile-overlay.open { opacity: 1; pointer-events: auto; }
.mobile-overlay a {
  font-family: var(--font-display);
  font-size: 26px; font-weight: 600;
  color: rgba(255,255,255,0.8);
  transition: color var(--transition);
}
.mobile-overlay a:hover { color: var(--clr-accent); }

/* ═══════════════════════════════════════════════════════════
   HERO
════════════════════════════════════════════════════════════ */
.hero {
  padding: calc(var(--nav-height) + 80px) 10% 60px;
  max-width: 780px;
  animation: fadeUp 0.8s var(--ease) both;
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
.hero-eyebrow {
  display: inline-block;
  padding: 8px 16px; border-radius: 999px;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.1);
  font-size: 13px; color: var(--clr-accent);
  margin-bottom: 24px;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(38px, 5vw, 64px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -1px;
  margin-bottom: 18px;
}
.hero p {
  font-size: 17px;
  color: var(--clr-dim);
  line-height: 1.8;
}

/* ═══════════════════════════════════════════════════════════
   FORM SECTION
════════════════════════════════════════════════════════════ */
.form-section {
  padding: 0 10% 120px;
}
.form-card {
  border-radius: var(--radius-xl);
  padding: 64px;
}
.form-header {
  margin-bottom: 48px;
}
.form-header h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 3vw, 40px);
  font-weight: 700;
  margin-top: 14px;
  letter-spacing: -0.3px;
}

/* ── Budget form grid ────────────────────────────────────── */
.budget-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.input-group {
  display: flex;
  flex-direction: column;
}
.full-width { grid-column: 1 / -1; }

.input-group label {
  font-size: 13px;
  font-weight: 500;
  color: var(--clr-dim);
  margin-bottom: 10px;
  letter-spacing: 0.2px;
}

.input-group input,
.input-group select,
.input-group textarea {
  width: 100%;
  padding: 15px 18px;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.04);
  color: var(--clr-text);
  font-family: var(--font-body);
  font-size: 15px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  appearance: none;
  -webkit-appearance: none;
}
.input-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2394a3b8' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 44px;
  cursor: pointer;
}
.input-group select option {
  background: #0d1e35;
  color: var(--clr-text);
}
.input-group input::placeholder,
.input-group textarea::placeholder {
  color: var(--clr-muted);
}
.input-group input:focus,
.input-group select:focus,
.input-group textarea:focus {
  border-color: var(--clr-accent);
  box-shadow: 0 0 0 3px rgba(82,196,240,0.12);
  background: rgba(255,255,255,0.05);
}
.input-group input.is-error,
.input-group select.is-error,
.input-group textarea.is-error {
  border-color: var(--clr-error);
  box-shadow: 0 0 0 3px var(--clr-error-dim);
}
.field-error {
  font-size: 12px;
  color: var(--clr-error);
  margin-top: 6px;
}
.input-group textarea {
  min-height: 140px;
  resize: vertical;
}

/* Submit */
.submit-btn {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 18px;
  border: none;
  border-radius: var(--radius-md);
  background: var(--clr-primary);
  color: white;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 24px rgba(23,121,245,0.3);
}
.submit-btn:hover {
  background: var(--clr-primary-h);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(23,121,245,0.4);
}
.submit-btn:disabled {
  opacity: 0.7; cursor: not-allowed; transform: none;
}

/* ── Info sidebar row ─────────────────────────────────────── */
.form-info-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 32px;
}
.form-info-item {
  padding: 24px;
  border-radius: var(--radius-lg);
  text-align: center;
}
.form-info-item-icon { font-size: 28px; margin-bottom: 10px; }
.form-info-item h4 {
  font-family: var(--font-display);
  font-size: 15px; font-weight: 700;
  margin-bottom: 6px;
}
.form-info-item p {
  font-size: 13px; color: var(--clr-muted);
  line-height: 1.5;
}

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE
════════════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  .navbar { padding: 0 32px; }
  .form-info-row { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .navbar { padding: 0 20px; }
  .nav-links { display: none; }
  .nav-back  { display: none; }
  .menu-toggle { display: flex; }
  .hero { padding: calc(var(--nav-height) + 48px) 5% 48px; }
  .form-section { padding: 0 5% 80px; }
  .form-card { padding: 32px 24px; }
  .budget-form { grid-template-columns: 1fr; }
  .full-width { grid-column: auto; }
  .submit-btn { grid-column: auto; }
  .form-info-row { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 34px; }
}