/* =====================================================
   Brief de Estrategia · Niumedia
   Design system extracted from niumedia.mx
   ===================================================== */

@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800;900&family=Open+Sans:wght@400;500;600;700&display=swap');

:root {
  --niu-orange: #F16A21;
  --niu-orange-dark: #F06000;
  --niu-orange-soft: rgba(241, 106, 33, 0.15);
  --niu-bg: #2B2424;
  --niu-bg-dark: #1a1515;
  --niu-surface: #272121;
  --niu-surface-light: #3a3232;
  --niu-text: #FFFFFF;
  --niu-text-dim: #b8aeae;
  --niu-text-muted: #756969;
  --niu-border: rgba(255, 255, 255, 0.08);
  --niu-border-strong: rgba(255, 255, 255, 0.18);
  --niu-success: #198754;
  --niu-error: #dc3545;

  --font-heading: 'Nunito', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body: 'Open Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-pill: 9999px;

  --shadow-soft: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 8px 32px rgba(241, 106, 33, 0.25);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--niu-bg);
  background-image:
    radial-gradient(at 15% 10%, rgba(241, 106, 33, 0.08) 0%, transparent 50%),
    radial-gradient(at 85% 90%, rgba(241, 106, 33, 0.05) 0%, transparent 50%);
  color: var(--niu-text);
  line-height: 1.6;
  min-height: 100vh;
  font-size: 16px;
}

/* ========== HEADER ========== */
.site-header {
  padding: 24px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--niu-border);
  position: sticky;
  top: 0;
  background: rgba(43, 36, 36, 0.92);
  backdrop-filter: blur(12px);
  z-index: 100;
}

.site-header .logo {
  height: 36px;
}

.site-header .header-meta {
  font-family: var(--font-heading);
  font-size: 14px;
  color: var(--niu-text-dim);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ========== HERO ========== */
.hero {
  max-width: 760px;
  margin: 0 auto;
  padding: 60px 32px 40px;
  text-align: center;
}

.hero-eyebrow {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--niu-orange);
  margin-bottom: 20px;
}

.hero h1 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.hero h1 .client-name {
  color: var(--niu-orange);
}

.hero-lead {
  font-size: 17px;
  color: var(--niu-text-dim);
  max-width: 580px;
  margin: 0 auto 16px;
  line-height: 1.65;
}

.hero-time {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 600;
  color: var(--niu-text-muted);
  background: var(--niu-surface);
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--niu-border);
  margin-top: 24px;
}

.hero-time::before {
  content: "⏱";
  font-size: 14px;
}

/* ========== PROGRESS BAR ========== */
.progress-wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 32px;
}

.progress-bar {
  height: 4px;
  background: var(--niu-surface);
  border-radius: var(--radius-pill);
  overflow: hidden;
  margin-bottom: 12px;
}

.progress-bar-fill {
  height: 100%;
  background: var(--niu-orange);
  border-radius: var(--radius-pill);
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  width: 0%;
}

.progress-label {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 600;
  color: var(--niu-text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ========== FORM SECTIONS ========== */
.form-container {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px;
}

.section {
  display: none;
  animation: fadeIn 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

.section.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.section-header {
  margin-bottom: 32px;
}

.section-number {
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.2em;
  color: var(--niu-orange);
  margin-bottom: 8px;
}

.section h2 {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  line-height: 1.15;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.section-sub {
  color: var(--niu-text-dim);
  font-size: 15px;
}

/* ========== FORM FIELDS ========== */
.field {
  margin-bottom: 28px;
}

.field-label {
  display: block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 15px;
  color: var(--niu-text);
  margin-bottom: 8px;
  line-height: 1.4;
}

.field-hint {
  display: block;
  font-size: 13px;
  color: var(--niu-text-muted);
  margin-bottom: 10px;
  font-style: italic;
}

.field-optional {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--niu-text-muted);
  margin-left: 8px;
  vertical-align: middle;
}

.input,
.textarea,
.select {
  width: 100%;
  background: var(--niu-surface);
  border: 1px solid var(--niu-border-strong);
  color: var(--niu-text);
  font-family: var(--font-body);
  font-size: 15px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
}

.input:focus,
.textarea:focus,
.select:focus {
  border-color: var(--niu-orange);
  background: var(--niu-surface-light);
  box-shadow: 0 0 0 4px var(--niu-orange-soft);
}

.input::placeholder,
.textarea::placeholder {
  color: var(--niu-text-muted);
}

.textarea {
  min-height: 110px;
  resize: vertical;
  line-height: 1.55;
}

.select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23F16A21' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 18px;
  padding-right: 44px;
}

/* Radio / Checkbox cards */
.choice-group {
  display: grid;
  gap: 10px;
}

.choice-group.cols-2 {
  grid-template-columns: 1fr 1fr;
}

@media (max-width: 540px) {
  .choice-group.cols-2 { grid-template-columns: 1fr; }
}

.choice {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--niu-surface);
  border: 1px solid var(--niu-border-strong);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  font-size: 15px;
}

.choice:hover {
  border-color: var(--niu-orange);
  background: var(--niu-surface-light);
}

.choice input {
  accent-color: var(--niu-orange);
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.choice input:checked + span {
  color: var(--niu-orange);
  font-weight: 600;
}

.choice:has(input:checked) {
  border-color: var(--niu-orange);
  background: var(--niu-orange-soft);
}

/* ========== NAV BUTTONS ========== */
.nav-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--niu-border);
}

.btn {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  padding: 14px 28px;
  border: none;
  cursor: pointer;
  transition: transform 0.15s, background 0.2s, box-shadow 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary {
  background: var(--niu-surface-light);
  color: var(--niu-text);
  border-radius: 0;
  border: 1px solid transparent;
  position: relative;
}

.btn-primary::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--niu-orange);
  z-index: -1;
  transform: translate(6px, 6px);
  transition: transform 0.2s;
}

.btn-primary {
  position: relative;
  z-index: 1;
  isolation: isolate;
}

.btn-primary:hover {
  transform: translate(2px, 2px);
}

.btn-primary:hover::after {
  transform: translate(4px, 4px);
}

.btn-secondary {
  background: transparent;
  color: var(--niu-text-dim);
  border: 1px solid var(--niu-border-strong);
  border-radius: var(--radius-pill);
}

.btn-secondary:hover {
  border-color: var(--niu-orange);
  color: var(--niu-orange);
}

.btn-cta {
  background: var(--niu-orange);
  color: #fff;
  border-radius: 0;
  font-weight: 800;
  font-size: 16px;
  padding: 18px 36px;
  box-shadow: var(--shadow-glow);
}

.btn-cta:hover {
  background: var(--niu-orange-dark);
  transform: translateY(-2px);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ========== AUTO-SAVE INDICATOR ========== */
.autosave {
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 600;
  color: var(--niu-text-muted);
  letter-spacing: 0.05em;
}

.autosave.saving { color: var(--niu-text-dim); }
.autosave.saved { color: var(--niu-success); }

/* ========== SUCCESS ========== */
.success-card {
  text-align: center;
  padding: 60px 32px;
  background: var(--niu-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--niu-orange);
  margin: 32px 0;
}

.success-card .check {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--niu-orange);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  margin-bottom: 24px;
}

.success-card h2 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 2rem;
  margin-bottom: 12px;
}

.success-card p {
  color: var(--niu-text-dim);
  max-width: 480px;
  margin: 0 auto 16px;
}

/* ========== FOOTER ========== */
.site-footer {
  border-top: 1px solid var(--niu-border);
  padding: 32px;
  text-align: center;
  font-size: 13px;
  color: var(--niu-text-muted);
}

.site-footer a {
  color: var(--niu-orange);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

/* ========== ERROR STATE ========== */
.error-msg {
  display: block;
  font-size: 13px;
  color: var(--niu-error);
  margin-top: 6px;
}

.input.invalid,
.textarea.invalid {
  border-color: var(--niu-error);
}

/* ========== MOBILE TWEAKS ========== */
@media (max-width: 640px) {
  .site-header { padding: 16px 20px; }
  .hero { padding: 40px 20px 24px; }
  .form-container { padding: 20px; }
  .progress-wrap { padding: 0 20px; }
  .btn { padding: 12px 20px; font-size: 14px; }
  .btn-cta { padding: 16px 28px; }
  .nav-row { flex-direction: column-reverse; }
  .nav-row .btn { width: 100%; justify-content: center; }
}