/* ==========================================================================
   Email Bounce Checker — emailbouncechecker.com
   Clean corporate SaaS. Mobile first. BEM naming.
   ========================================================================== */

:root {
  --blue-700: #1d4ed8;
  --blue-800: #1e40af;
  --blue-50: #eff6ff;
  --blue-100: #dbeafe;
  --slate-900: #0f172a;
  --slate-700: #334155;
  --slate-500: #64748b;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --slate-50: #f8fafc;
  --green-600: #16a34a;
  --green-50: #f0fdf4;
  --red-600: #dc2626;
  --red-50: #fef2f2;
  --amber-600: #d97706;
  --amber-50: #fffbeb;
  --grey-600: #52525b;
  --grey-50: #fafafa;
  --radius: 10px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --font-display: "Inter Tight", "Inter", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001s !important; transition-duration: 0.001s !important; }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--slate-700);
  background: #fff;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: min(1120px, 100% - 2.5rem);
  margin-inline: auto;
}

h1, h2, h3 {
  font-family: var(--font-display);
  color: var(--slate-900);
  line-height: 1.2;
  margin: 0 0 0.6em;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ===== Buttons ===== */

.btn {
  display: inline-block;
  font: 600 0.95rem/1 var(--font-body);
  padding: 0.75rem 1.25rem;
  border-radius: 8px;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn--primary { background: var(--blue-700); color: #fff; }
.btn--primary:hover { background: var(--blue-800); }

.btn--ghost { color: var(--slate-700); border-color: var(--slate-200); background: #fff; }
.btn--ghost:hover { border-color: var(--blue-700); color: var(--blue-700); }

.btn--inverse { background: #fff; color: var(--blue-700); }
.btn--inverse:hover { background: var(--blue-50); }

.btn--lg { padding: 0.95rem 1.75rem; font-size: 1.05rem; }

/* ===== Header ===== */

.site-header {
  border-bottom: 1px solid var(--slate-200);
  background: rgba(255, 255, 255, 0.95);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(6px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.8rem 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
}

.brand__name {
  font: 700 1.05rem var(--font-display);
  color: var(--slate-900);
  white-space: nowrap;
}

.site-nav { display: none; }

.site-header__actions { display: flex; gap: 0.6rem; }

@media (min-width: 880px) {
  .site-nav { display: flex; gap: 1.6rem; }
  .site-nav__link {
    text-decoration: none;
    color: var(--slate-500);
    font-size: 0.95rem;
    font-weight: 500;
  }
  .site-nav__link:hover { color: var(--blue-700); }
}

/* ===== Hero ===== */

.hero {
  background:
    radial-gradient(640px 320px at 85% -10%, var(--blue-100), transparent 70%),
    linear-gradient(180deg, var(--blue-50), #fff 75%);
  padding: 4rem 0 4.5rem;
}

.hero__grid {
  display: grid;
  gap: 2.5rem;
  align-items: start;
}

@media (min-width: 940px) {
  .hero__grid { grid-template-columns: 1.1fr 0.9fr; gap: 4rem; }
  .hero { padding: 5.5rem 0 6rem; }
}

.hero__eyebrow {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--blue-700);
  margin: 0 0 1rem;
}

.hero__title {
  font-size: clamp(2.3rem, 5.5vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.hero__lead {
  font-size: 1.1rem;
  max-width: 36rem;
  margin: 0 0 1.25rem;
}

.hero__points {
  list-style: none;
  margin: 0;
  padding: 0;
}

.hero__points li {
  padding-left: 1.7rem;
  position: relative;
  margin-bottom: 0.5rem;
}

.hero__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.32rem;
  width: 1.05rem;
  height: 1.05rem;
  border-radius: 50%;
  background: var(--blue-700);
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3 8.5l3.5 3.5L13 5' stroke='black' stroke-width='2.2' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / contain no-repeat;
          mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3 8.5l3.5 3.5L13 5' stroke='black' stroke-width='2.2' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / contain no-repeat;
}

/* ===== Checker widget ===== */

.checker-card {
  background: #fff;
  border: 1px solid var(--slate-200);
  border-radius: 14px;
  box-shadow: var(--shadow-md);
  padding: 1.75rem;
}

.checker-card__title { font-size: 1.25rem; margin-bottom: 0.25rem; }

.checker-card__sub {
  margin: 0 0 1.1rem;
  color: var(--slate-500);
  font-size: 0.9rem;
}

.checker-card__form { display: grid; gap: 0.7rem; }

.checker-card__input {
  font: 400 1rem var(--font-body);
  padding: 0.8rem 0.95rem;
  border: 1.5px solid var(--slate-200);
  border-radius: 8px;
  width: 100%;
  color: var(--slate-900);
}

.checker-card__input:focus {
  outline: none;
  border-color: var(--blue-700);
  box-shadow: 0 0 0 3px var(--blue-100);
}

.checker-card__submit { width: 100%; }
.checker-card__submit:disabled { opacity: 0.65; cursor: wait; }

.checker-card__progress {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 1rem;
  font-size: 0.92rem;
  color: var(--slate-500);
}

.spinner {
  width: 1rem;
  height: 1rem;
  flex: none;
  border-radius: 50%;
  border: 2.5px solid var(--blue-100);
  border-top-color: var(--blue-700);
  animation: ebc-spin 0.8s linear infinite;
}

@keyframes ebc-spin { to { transform: rotate(360deg); } }

.checker-card__result { margin-top: 1rem; }

.result {
  border: 1px solid var(--slate-200);
  border-radius: 10px;
  padding: 1rem 1.1rem;
}

.result--deliverable { background: var(--green-50); border-color: #bbf7d0; }
.result--undeliverable { background: var(--red-50); border-color: #fecaca; }
.result--risky { background: var(--amber-50); border-color: #fde68a; }
.result--unknown { background: var(--grey-50); border-color: var(--slate-200); }
.result--error { background: var(--red-50); border-color: #fecaca; }

.result__status {
  display: inline-block;
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.22rem 0.6rem;
  border-radius: 999px;
  color: #fff;
  margin-bottom: 0.5rem;
}

.result--deliverable .result__status { background: var(--green-600); }
.result--undeliverable .result__status { background: var(--red-600); }
.result--risky .result__status { background: var(--amber-600); }
.result--unknown .result__status { background: var(--grey-600); }

.result__email {
  font-weight: 600;
  color: var(--slate-900);
  margin: 0 0 0.2rem;
  word-break: break-all;
}

.result__reason { margin: 0 0 0.6rem; font-size: 0.92rem; }

.result__flags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0;
  margin: 0 0 0.8rem;
}

.result__flag {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--slate-700);
  background: #fff;
  border: 1px solid var(--slate-200);
  border-radius: 999px;
  padding: 0.18rem 0.6rem;
}

.result__remaining {
  font-size: 0.82rem;
  color: var(--slate-500);
  margin: 0 0 0.8rem;
}

.result__cta {
  display: inline-block;
  font-weight: 600;
  font-size: 0.95rem;
  color: #fff;
  background: var(--blue-700);
  border-radius: 8px;
  padding: 0.65rem 1.1rem;
  text-decoration: none;
}

.result__cta:hover { background: var(--blue-800); }

.result__error-text { margin: 0; color: var(--red-600); font-weight: 500; }

/* ===== Stats strip ===== */

.stats {
  border-block: 1px solid var(--slate-200);
  background: var(--slate-50);
  padding: 2rem 0;
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

@media (min-width: 800px) {
  .stats__grid { grid-template-columns: repeat(4, 1fr); }
}

.stats__item { text-align: center; }

.stats__value {
  display: block;
  font: 800 2rem var(--font-display);
  color: var(--blue-700);
}

.stats__label {
  font-size: 0.86rem;
  color: var(--slate-500);
}

/* ===== Sections ===== */

.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.015em;
}

.section-lead {
  font-size: 1.05rem;
  max-width: 44rem;
  margin-bottom: 2rem;
}

/* ===== Thresholds ===== */

.thresholds { padding: 4.5rem 0; }

.thresholds__inner { max-width: 50rem; }

.threshold-bars { display: grid; gap: 1.4rem; margin: 2.2rem 0; }

.threshold-bars__row { display: grid; gap: 0.5rem; }

.threshold-bars__bar {
  height: 0.85rem;
  border-radius: 999px;
  min-width: 4rem;
}

.threshold-bars__bar--safe { background: var(--green-600); }
.threshold-bars__bar--warn { background: var(--amber-600); }
.threshold-bars__bar--danger { background: var(--red-600); }

.threshold-bars__meta { font-size: 0.95rem; }

.thresholds__note {
  background: var(--blue-50);
  border-left: 4px solid var(--blue-700);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1rem 1.25rem;
}

/* ===== How it works ===== */

.how {
  background: var(--slate-50);
  border-block: 1px solid var(--slate-200);
  padding: 4.5rem 0;
}

.how__steps {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 800px) {
  .how__steps { grid-template-columns: repeat(3, 1fr); }
}

.how__step {
  background: #fff;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.how__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 50%;
  background: var(--blue-700);
  color: #fff;
  font: 700 1rem var(--font-display);
  margin-bottom: 0.9rem;
}

.how__heading { font-size: 1.1rem; }

.how__step p { margin: 0; font-size: 0.95rem; }

/* ===== Features ===== */

.features { padding: 4.5rem 0; }

.feature-grid {
  display: grid;
  gap: 1.25rem;
  margin-top: 2rem;
}

@media (min-width: 680px) { .feature-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .feature-grid { grid-template-columns: repeat(3, 1fr); } }

.feature-card {
  border: 1px solid var(--slate-200);
  border-radius: var(--radius);
  padding: 1.5rem;
  background: #fff;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.15s ease, border-color 0.15s ease;
}

.feature-card:hover { box-shadow: var(--shadow-md); border-color: var(--blue-100); }

.feature-card__title { font-size: 1.05rem; }

.feature-card__body { margin: 0; font-size: 0.94rem; }

/* ===== Pricing ===== */

.pricing {
  background: var(--slate-50);
  border-block: 1px solid var(--slate-200);
  padding: 4.5rem 0;
}

.pricing__free {
  background: var(--green-50);
  border: 1px solid #bbf7d0;
  border-radius: var(--radius);
  padding: 0.9rem 1.2rem;
  margin-bottom: 1.6rem;
  color: var(--slate-900);
}

.pricing-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, 1fr);
}

@media (min-width: 900px) { .pricing-grid { grid-template-columns: repeat(5, 1fr); } }

.price-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius);
  padding: 1.4rem 1.1rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.price-card--popular {
  border-color: var(--blue-700);
  border-width: 2px;
  box-shadow: var(--shadow-md);
}

.price-card__badge {
  position: absolute;
  top: -0.8rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--blue-700);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  white-space: nowrap;
}

.price-card__name { font-size: 1rem; margin-bottom: 0.3rem; }

.price-card__credits {
  margin: 0 0 0.4rem;
  color: var(--slate-500);
  font-size: 0.88rem;
}

.price-card__price {
  margin: 0;
  font: 800 1.7rem var(--font-display);
  color: var(--slate-900);
}

.pricing__cta-row { text-align: center; margin: 2.2rem 0 0; }

/* ===== FAQ ===== */

.faq { padding: 4.5rem 0; }

.faq__inner { max-width: 46rem; }

.faq__item {
  border: 1px solid var(--slate-200);
  border-radius: var(--radius);
  margin-bottom: 0.8rem;
  background: #fff;
}

.faq__q {
  cursor: pointer;
  font-weight: 600;
  color: var(--slate-900);
  padding: 1rem 1.2rem;
  list-style: none;
  position: relative;
  padding-right: 2.6rem;
}

.faq__q::-webkit-details-marker { display: none; }

.faq__q::after {
  content: "+";
  position: absolute;
  right: 1.2rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.3rem;
  color: var(--blue-700);
}

.faq__item[open] .faq__q::after { content: "–"; }

.faq__a { margin: 0; padding: 0 1.2rem 1.1rem; font-size: 0.96rem; }

/* ===== CTA band ===== */

.cta-band {
  background: linear-gradient(120deg, var(--blue-800), var(--blue-700));
  padding: 4rem 0;
}

.cta-band__inner { text-align: center; }

.cta-band__title { color: #fff; font-size: clamp(1.6rem, 3.5vw, 2.2rem); }

.cta-band__sub { color: var(--blue-100); margin: 0 0 1.6rem; }

/* ===== Footer ===== */

.site-footer {
  background: var(--slate-900);
  color: #cbd5e1;
  padding: 3.5rem 0 2.5rem;
}

.site-footer__grid { display: grid; gap: 2.2rem; }

@media (min-width: 800px) {
  .site-footer__grid { grid-template-columns: 1.4fr 1fr 1.2fr 0.8fr; }
}

.site-footer__brand {
  font: 700 1.1rem var(--font-display);
  color: #fff;
  margin: 0 0 0.5rem;
}

.site-footer__tag { font-size: 0.9rem; margin: 0 0 1.2rem; }

.site-footer__copyright { font-size: 0.85rem; color: var(--slate-500); margin: 0; }

.site-footer__heading {
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  margin-bottom: 0.9rem;
}

.site-footer__list { list-style: none; margin: 0; padding: 0; }

.site-footer__list li { margin-bottom: 0.5rem; }

.site-footer__list a {
  color: #cbd5e1;
  text-decoration: none;
  font-size: 0.92rem;
}

.site-footer__list a:hover { color: #fff; text-decoration: underline; }

/* ===== Legal pages ===== */

.legal-page { padding: 3.5rem 0 4.5rem; }

.legal-page__inner { max-width: 44rem; }

.legal-page h1 { font-size: 2rem; }

.legal-page h2 { font-size: 1.25rem; margin-top: 2.2rem; }

.legal-page__updated { color: var(--slate-500); font-size: 0.9rem; }