/* ============================================================
   Survey Portal — Marketing Website Stylesheet
   Mobile-first, accessible, light theme (dark-theme ready)
   ============================================================ */

/* ---------- Design tokens ---------- */
:root {
  --color-bg: #ffffff;
  --color-surface: #f7f9fc;
  --color-surface-2: #eef2f8;
  --color-border: #e2e8f0;
  --color-text: #0f172a;
  --color-text-muted: #475569;
  --color-primary: #4f46e5;
  --color-primary-dark: #3730a3;
  --color-primary-soft: #eef0fe;
  --color-accent: #0ea5e9;
  --color-success: #16a34a;
  --color-success-soft: #dcfce7;
  --color-danger: #dc2626;
  --color-danger-soft: #fee2e2;
  --color-warning: #d97706;

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 48px rgba(15, 23, 42, 0.12);

  --container: 1160px;
  --gap: clamp(1rem, 2vw, 1.5rem);

  --font-sans: "Inter", "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
}

/* ---------- Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 0.5em; color: var(--color-text); }
h1 { font-size: clamp(2rem, 5vw, 3.25rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); letter-spacing: -0.01em; }
h3 { font-size: clamp(1.15rem, 2vw, 1.4rem); }
p { margin: 0 0 1rem; }

ul { margin: 0; padding: 0; }

/* ---------- Accessibility helpers ---------- */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--color-primary);
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  z-index: 200;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 1rem; text-decoration: none; }

.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;
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

.section { padding-block: clamp(3rem, 7vw, 5.5rem); }
.section--surface { background: var(--color-surface); }
.section--tight { padding-block: clamp(2rem, 4vw, 3rem); }

.section-head { max-width: 720px; margin: 0 auto 2.5rem; text-align: center; }
.section-head p { color: var(--color-text-muted); font-size: 1.05rem; }

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 1rem;
  padding: 0.8rem 1.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
  min-height: 48px; /* touch-friendly */
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary { background: var(--color-primary); color: #fff; box-shadow: var(--shadow-sm); }
.btn--primary:hover { background: var(--color-primary-dark); }

.btn--ghost { background: transparent; color: var(--color-primary); border-color: var(--color-border); }
.btn--ghost:hover { background: var(--color-primary-soft); }

.btn--light { background: #fff; color: var(--color-primary); }
.btn--light:hover { background: var(--color-surface-2); }

.btn--block { width: 100%; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 72px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--color-text);
}
.brand:hover { text-decoration: none; }
.brand { white-space: nowrap; flex: none; }
.brand__logo { height: 40px; width: auto; display: block; }
.site-footer .brand__logo { height: 38px; }
.brand__mark {
  display: grid;
  place-items: center;
  width: 36px; height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  font-size: 1.1rem;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  margin-left: auto;
}
.nav__links {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  list-style: none;
}
.nav__links a {
  display: inline-block;
  padding: 0.5rem 0.7rem;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-weight: 500;
  white-space: nowrap;
}
.nav__links a:hover { color: var(--color-text); background: var(--color-surface); text-decoration: none; }
.nav__links a[aria-current="page"] { color: var(--color-primary); background: var(--color-primary-soft); }

.nav__actions { display: flex; align-items: center; gap: 0.6rem; flex: none; }
.nav__actions .btn { padding: 0.6rem 1.05rem; min-height: 44px; font-size: 0.95rem; }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 46px; height: 46px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: #fff;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav__toggle span {
  width: 22px; height: 2px; background: var(--color-text);
  border-radius: 2px; transition: transform 0.2s ease, opacity 0.2s ease;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(1000px 500px at 80% -10%, rgba(14, 165, 233, 0.14), transparent 60%),
    radial-gradient(800px 500px at 0% 10%, rgba(79, 70, 229, 0.12), transparent 55%),
    var(--color-bg);
}
.hero__grid {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: center;
  grid-template-columns: 1fr;
}
.hero__lead { font-size: 1.15rem; color: var(--color-text-muted); max-width: 42ch; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 1.5rem; }
.hero__trust { margin-top: 2rem; color: var(--color-text-muted); font-size: 0.9rem; }

.hero__panel {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 1.25rem;
}
.hero__panel h3 { margin-bottom: 1rem; font-size: 1rem; color: var(--color-text-muted); }
.mini-bar { display: grid; gap: 0.75rem; }
.mini-bar__row { display: grid; grid-template-columns: 90px 1fr 44px; align-items: center; gap: 0.6rem; font-size: 0.9rem; }
.mini-bar__track { height: 10px; background: var(--color-surface-2); border-radius: 999px; overflow: hidden; }
.mini-bar__fill { height: 100%; border-radius: 999px; background: linear-gradient(90deg, var(--color-primary), var(--color-accent)); }

/* ---------- Grid utility ---------- */
.grid { display: grid; gap: var(--gap); }
.grid--2 { grid-template-columns: 1fr; }
.grid--3 { grid-template-columns: 1fr; }
.grid--4 { grid-template-columns: 1fr; }

/* ---------- Cards ---------- */
.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
  height: 100%;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: #cbd5e1; }
.card__icon {
  display: grid; place-items: center;
  width: 48px; height: 48px;
  border-radius: 12px;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: 1.4rem;
  margin-bottom: 1rem;
}

/* Accent feature cards (colored top bar, centered icon) */
.card--feature {
  text-align: center;
  border-top: 4px solid var(--color-primary);
  padding-top: 1.75rem;
}
.card--feature .card__icon {
  margin-inline: auto;
  width: 64px; height: 64px;
  font-size: 1.9rem;
  border-radius: 50%;
}
.card--feature.accent-1 { border-top-color: #f97316; }
.card--feature.accent-1 .card__icon { background: #fff1e6; color: #f97316; }
.card--feature.accent-2 { border-top-color: #ec4899; }
.card--feature.accent-2 .card__icon { background: #fce7f3; color: #ec4899; }
.card--feature.accent-3 { border-top-color: #22c55e; }
.card--feature.accent-3 .card__icon { background: #dcfce7; color: #16a34a; }
.card--feature.accent-4 { border-top-color: #0ea5e9; }
.card--feature.accent-4 .card__icon { background: #e0f2fe; color: #0284c7; }
.card h3 { margin-bottom: 0.4rem; }
.card p { color: var(--color-text-muted); margin: 0; }

/* ---------- Steps (how it works) ---------- */
.steps { counter-reset: step; }
.step { position: relative; padding-left: 3.25rem; }
.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute; left: 0; top: 0;
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff; font-weight: 700;
}

/* ---------- Stats ---------- */
.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--gap); }
.stat { text-align: center; padding: 1.25rem; }
.stat__num { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 800; color: var(--color-primary); }
.stat__label { color: var(--color-text-muted); font-size: 0.95rem; }

/* ---------- Testimonials ---------- */
.quote { display: flex; flex-direction: column; gap: 1rem; }
.quote p { font-size: 1.05rem; color: var(--color-text); }
.quote__author { display: flex; align-items: center; gap: 0.75rem; }
.avatar {
  width: 44px; height: 44px; border-radius: 50%;
  display: grid; place-items: center; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
}
.quote__author strong { display: block; }
.quote__author span { color: var(--color-text-muted); font-size: 0.9rem; }

/* Testimonial carousel */
.carousel { max-width: 760px; margin-inline: auto; text-align: center; }
.carousel__viewport { position: relative; min-height: 190px; }
.carousel__slide {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; gap: 1rem;
  opacity: 0; visibility: hidden;
  transition: opacity 0.4s ease;
}
.carousel__slide.is-active { opacity: 1; visibility: visible; position: relative; }
.carousel__slide p { font-size: 1.2rem; color: var(--color-text); max-width: 60ch; }
.carousel__slide .quote__author { justify-content: center; }
.carousel__dots { display: flex; gap: 0.6rem; justify-content: center; margin-top: 1.5rem; }
.carousel__dot {
  width: 12px; height: 12px; border-radius: 50%;
  border: 2px solid var(--color-primary);
  background: transparent; cursor: pointer; padding: 0;
  transition: background 0.2s ease, transform 0.2s ease;
}
.carousel__dot:hover { transform: scale(1.15); }
.carousel__dot[aria-selected="true"] { background: var(--color-primary); }

/* Social icons */
.social { display: flex; gap: 0.6rem; }
.social a {
  display: grid; place-items: center;
  width: 40px; height: 40px; border-radius: 50%;
  background: rgba(255,255,255,0.08);
  color: #cbd5e1; font-weight: 700; font-size: 0.9rem;
  transition: background 0.2s ease, color 0.2s ease;
}
.social a:hover { background: var(--color-primary); color: #fff; text-decoration: none; }

/* ---------- Badge / pill ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-size: 0.8rem; font-weight: 600;
  padding: 0.25rem 0.6rem; border-radius: 999px;
  background: var(--color-success-soft); color: var(--color-success);
}
.pill-list { display: flex; flex-wrap: wrap; gap: 0.5rem; list-style: none; }
.pill-list li {
  padding: 0.5rem 0.9rem; border-radius: 999px;
  background: var(--color-surface); border: 1px solid var(--color-border);
  font-weight: 500; font-size: 0.95rem;
}

/* ---------- FAQ ---------- */
.faq { max-width: 780px; margin-inline: auto; display: grid; gap: 0.75rem; }
.faq details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: #fff;
  padding: 0 1.25rem;
}
.faq summary {
  list-style: none;
  cursor: pointer;
  font-weight: 600;
  padding: 1.1rem 0;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 1.4rem; color: var(--color-primary); line-height: 1; }
.faq details[open] summary::after { content: "\2212"; }
.faq details > p { padding-bottom: 1.1rem; color: var(--color-text-muted); margin: 0; }

/* ---------- CTA band ---------- */
.cta-band {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  border-radius: var(--radius-lg);
  padding: clamp(2rem, 5vw, 3.5rem);
  text-align: center;
}
.cta-band h2 { color: #fff; }
.cta-band p { color: rgba(255, 255, 255, 0.85); max-width: 55ch; margin-inline: auto; }
.cta-band .btn--primary { background: #fff; color: var(--color-primary); }
.cta-band .btn--primary:hover { background: var(--color-surface-2); }
.cta-band .btn--ghost { color: #fff; border-color: rgba(255,255,255,0.5); }
.cta-band .btn--ghost:hover { background: rgba(255,255,255,0.12); }

/* ---------- Page hero (inner pages) ---------- */
.page-hero {
  background:
    radial-gradient(700px 380px at 90% -20%, rgba(79, 70, 229, 0.12), transparent 60%),
    var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding-block: clamp(2.5rem, 6vw, 4rem);
}
.page-hero p { color: var(--color-text-muted); max-width: 60ch; font-size: 1.1rem; }

/* ---------- Prose (article content) ---------- */
.prose { max-width: 760px; }
.prose h2 { margin-top: 2rem; }
.prose ul { padding-left: 1.25rem; }
.prose li { margin-bottom: 0.4rem; }

/* ---------- Forms ---------- */
.form { display: grid; gap: 1.1rem; }
.form__row { display: grid; gap: 1.1rem; grid-template-columns: 1fr; }
.field { display: grid; gap: 0.4rem; }
.field label { font-weight: 600; font-size: 0.95rem; }
.field .req { color: var(--color-danger); }
.field input,
.field select,
.field textarea {
  font: inherit;
  color: var(--color-text);
  padding: 0.8rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: #fff;
  min-height: 48px;
  width: 100%;
}
.field textarea { min-height: 130px; resize: vertical; }
.field input:focus,
.field select:focus,
.field textarea:focus { border-color: var(--color-primary); outline: 3px solid var(--color-primary-soft); outline-offset: 0; }
.field small { color: var(--color-text-muted); }
.field .error-text { color: var(--color-danger); font-size: 0.85rem; display: none; }
.field.is-invalid input,
.field.is-invalid select,
.field.is-invalid textarea { border-color: var(--color-danger); background: var(--color-danger-soft); }
.field.is-invalid .error-text { display: block; }

.form-success {
  display: none;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  background: var(--color-success-soft);
  border: 1px solid #86efac;
  color: #14532d;
}
.form-success.is-visible { display: flex; }
.form-success strong { display: block; }

.form-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: clamp(1.5rem, 4vw, 2.25rem);
}

/* ---------- Contact split ---------- */
.contact-grid { display: grid; gap: var(--gap); grid-template-columns: 1fr; }
.contact-info li { display: flex; gap: 0.75rem; align-items: flex-start; list-style: none; margin-bottom: 1rem; }
.contact-info .card__icon { margin: 0; flex: none; }

/* ---------- Footer ---------- */
.site-footer {
  background: #0f172a;
  color: #cbd5e1;
  padding-block: clamp(2.5rem, 5vw, 3.5rem) 1.5rem;
}
.site-footer a { color: #cbd5e1; }
.site-footer a:hover { color: #fff; }
.footer-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1fr;
  margin-bottom: 2rem;
}
.site-footer h4 { color: #fff; font-size: 0.95rem; text-transform: uppercase; letter-spacing: 0.05em; }
.site-footer ul { list-style: none; display: grid; gap: 0.5rem; }
.footer-brand p { color: #94a3b8; max-width: 34ch; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.25rem;
  display: flex; flex-wrap: wrap; gap: 0.5rem;
  justify-content: space-between; align-items: center;
  color: #94a3b8; font-size: 0.9rem;
}

/* ============================================================
   Responsive breakpoints
   Tablet: >=640px  |  Desktop: >=1024px
   ============================================================ */
@media (min-width: 640px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(4, 1fr); }
  .form__row--2 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}

@media (min-width: 1024px) {
  .hero__grid { grid-template-columns: 1.1fr 0.9fr; }
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
  .contact-grid { grid-template-columns: 1.2fr 0.8fr; }
  .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
}

/* ---------- Mobile navigation ---------- */
@media (max-width: 900px) {
  .nav__toggle { display: flex; }
  .nav__menu {
    position: fixed;
    inset: 72px 0 auto 0;
    margin-left: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0.4rem;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    padding: 1rem clamp(1rem, 4vw, 2rem) 1.5rem;
    box-shadow: var(--shadow);
    transform: translateY(-130%);
    transition: transform 0.25s ease;
    visibility: hidden;
    max-height: calc(100vh - 72px);
    overflow-y: auto;
  }
  .nav.is-open .nav__menu {
    transform: translateY(0);
    visibility: visible;
  }
  .nav__links {
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
  }
  .nav__links a { padding: 0.8rem 0.75rem; }
  .nav__actions {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--color-border);
  }
  .nav__actions .btn { width: 100%; }
  .nav.is-open .nav__toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav.is-open .nav__toggle span:nth-child(2) { opacity: 0; }
  .nav.is-open .nav__toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}