/* ==========================================================================
   Refine AI — styles.css
   ========================================================================== */

/* ---------- Design Tokens ---------- */
:root {
  /*--color-logo: #026c76;*/
  --color-logo: #3a5a60;
  --color-primary: #004349;
  --color-primary-container: #0d5c63;
  --color-on-primary: #ffffff;
  --color-on-surface: #414046;
  --color-on-surface-variant: #3f484a;
  --color-outline-variant: #bfc8c9;
  --color-surface: #ffffff;
  --color-slate-200: #e2e8f0;
  --color-slate-400: #94a3b8;
  --color-slate-500: #64748b;
  --color-slate-600: #475569;
  --color-slate-900: #0f172a;

  --font-headline: 'Young Serif', serif;
  --font-body: 'Plus Jakarta Sans', sans-serif;

  --max-width: 80rem; /* 1280px */
  --px: 2rem;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  background-color: var(--color-surface);
  color: var(--color-on-surface);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

::selection {
  background-color: #abeef6;
  color: var(--color-on-surface);
}

/* ---------- Typography ---------- */
.serif-headline {
  font-family: var(--font-headline);
}

/* ---------- Layout Helpers ---------- */
.container {
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--px);
  padding-right: var(--px);
}

.editorial-rule {
  height: 1px;
  background-color: var(--color-outline-variant);
  opacity: 0.2;
}

/* ---------- Logo ---------------- */
.logo_refine {
  font-family: var(--font-headline);
  font-size: clamp(1.75rem, 4.2vw, 3.85rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 2.5rem;
  color: var(--color-logo);
  max-width: 56rem;
}
.logo_ai {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 600;
  color: var(--color-logo);
  font-size: clamp(1.75rem, 4.2vw, 3.85rem);
  letter-spacing: 0.5px;
}
.logo_refine_footer {
  font-family: var(--font-headline);
  font-size: clamp(1.75rem, 2.2vw, 1.85rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 2.5rem;
  color: var(--color-logo);
  max-width: 56rem;
}
.logo_ai_footer {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 600;
  color: var(--color-logo);
  font-size: clamp(1.75rem, 2.2vw, 1.85rem);
  letter-spacing: 0.5px;
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 50;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.15);
}

.nav__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem var(--px);
  max-width: var(--max-width);
  margin: 0 auto;
}

.nav__logo {
  height: 60px;
  width: auto;
}

.nav__links {
  display: none;
  align-items: center;
  gap: 2.5rem;
  font-size: 0.875rem;
  letter-spacing: -0.01em;
}

.nav__link {
  color: var(--color-slate-600);
  transition: color 0.3s;
}

.nav__link:hover {
  color: var(--color-primary);
}

.nav__cta {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  padding: 0.625rem 1.25rem;
  border-radius: 0.5rem;
  font-weight: 600;
  transition: opacity 0.2s;
}

.nav__cta:hover {
  opacity: 0.9;
}

.nav__mobile-toggle {
  color: var(--color-primary);
  display: block;
}

.nav__mobile-toggle svg {
  width: 24px;
  height: 24px;
}

/* ---------- Mobile Menu ---------- */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 60;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
}

.mobile-menu.is-open {
  display: flex;
}

.mobile-menu__close {
  position: absolute;
  top: 1.5rem;
  right: 2rem;
  color: var(--color-on-surface);
}

.mobile-menu__close svg {
  width: 24px;
  height: 24px;
}

.mobile-menu__link {
  font-family: var(--font-headline);
  font-size: 1.5rem;
  color: var(--color-on-surface);
}

.mobile-menu__cta {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  padding: 0.75rem 2rem;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 1rem;
  margin-top: 1rem;
}

/* ---------- Hero ---------- */
.hero {
  padding-top: 12rem;
  padding-bottom: 8rem;
}

.hero__label {
  font-family: var(--font-body);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-primary);
  margin-bottom: 2rem;
  display: block;
  font-weight: 600;
}

.hero__heading {
  font-family: var(--font-headline);
  font-size: clamp(2.5rem, 6vw, 5.5rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 2.5rem;
  color: var(--color-on-surface);
  max-width: 56rem;
}

.hero__subheading {
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  color: var(--color-on-surface-variant);
  max-width: 40rem;
  margin-bottom: 3rem;
  line-height: 1.6;
}

.hero__actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2rem;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  padding: 1rem 2rem;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 1.125rem;
  transition: opacity 0.2s;
  display: inline-block;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.btn-primary:hover {
  opacity: 0.95;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--color-primary);
}

.link-arrow svg {
  width: 20px;
  height: 20px;
  transition: transform 0.2s;
}

.link-arrow:hover svg {
  transform: translateX(4px);
}

/* ---------- Pain Points ---------- */
.pain-points {
  padding-top: 8rem;
  padding-bottom: 8rem;
}

.pain-points__heading {
  font-family: var(--font-headline);
  font-size: clamp(1.75rem, 4vw, 3rem);
  margin-bottom: 6rem;
  max-width: 36rem;
}

.pain-points__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

.pain-point__icon {
  width: 28px;
  height: 28px;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
}

.pain-point__title {
  font-weight: 700;
  font-size: 1.125rem;
  margin-bottom: 0.75rem;
}

.pain-point__desc {
  color: var(--color-on-surface-variant);
  line-height: 1.7;
}

/* ---------- Process ---------- */
.process {
  padding-top: 10rem;
  padding-bottom: 10rem;
}

.process__heading {
  font-family: var(--font-headline);
  font-size: clamp(1.75rem, 4vw, 3rem);
  margin-bottom: 6rem;
}

.process__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4rem;
}

.process-step {
  position: relative;
}

.process-step__number {
  font-family: var(--font-headline);
  font-size: 10rem;
  font-weight: 700;
  position: absolute;
  top: -3.5rem;
  left: -0.25rem;
  opacity: 0.05;
  user-select: none;
  line-height: 1;
}

.process-step__content {
  position: relative;
  padding-top: 3rem;
}

.process-step__title {
  font-family: var(--font-headline);
  font-size: 1.875rem;
  font-style: italic;
  margin-bottom: 1rem;
}

.process-step__desc {
  font-size: 1.125rem;
  color: var(--color-on-surface-variant);
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

.process-step__tag {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-weight: 700;
  color: var(--color-primary);
}

/* ---------- Product Spotlight (RefineAI Answers) ---------- */
.product-spotlight {
  padding-top: 8rem;
  padding-bottom: 8rem;
}

.product-spotlight__inner {
  max-width: 48rem;
}

.product-spotlight__label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 1.5rem;
  display: block;
}

.product-spotlight__heading {
  font-family: var(--font-headline);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.product-spotlight__desc {
  font-size: 1.125rem;
  color: var(--color-on-surface-variant);
  line-height: 1.7;
  margin-bottom: 2rem;
}

.product-spotlight__features {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.product-feature {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.product-feature__icon {
  width: 20px;
  height: 20px;
  color: var(--color-primary-container);
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.product-feature__text {
  color: var(--color-on-surface-variant);
  line-height: 1.6;
}

.product-feature__text strong {
  color: var(--color-on-surface);
}

/* ---------- Impact Metrics ---------- */
.metrics {
  padding-top: 10rem;
  padding-bottom: 10rem;
}

.metrics__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3rem;
}

.metric__number {
  font-family: var(--font-headline);
  font-size: clamp(3rem, 6vw, 4.5rem);
  font-weight: 700;
  color: var(--color-primary-container);
  margin-bottom: 0.5rem;
}

.metric__label {
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-weight: 600;
  color: var(--color-slate-400);
}

/* ---------- Founder ---------- */
.founder {
  padding-top: 10rem;
  padding-bottom: 8rem;
}

.founder__inner {
  max-width: 48rem;
  margin: 0 auto;
  text-align: center;
}

.founder__heading {
  font-family: var(--font-headline);
  font-size: clamp(1.75rem, 4vw, 3rem);
  margin-bottom: 3rem;
  line-height: 1.2;
}

.founder__text {
  font-size: 1.25rem;
  color: var(--color-on-surface-variant);
  line-height: 1.7;
}

.founder__profile {
  margin-top: 4rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.founder__avatar {
  width: 6rem;
  height: 6rem;
  border-radius: 50%;
  object-fit: cover;
  filter: grayscale(1) contrast(1.25);
  background-color: #e5e7eb;
}

.founder__name {
  font-weight: 700;
  font-size: 1.125rem;
}

.founder__title {
  font-size: 0.875rem;
  color: var(--color-on-surface-variant);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ---------- FAQ ---------- */
.faq {
  padding-top: 10rem;
  padding-bottom: 10rem;
}

.faq__heading {
  font-family: var(--font-headline);
  font-size: clamp(1.75rem, 4vw, 3rem);
  margin-bottom: 5rem;
  text-align: center;
}

.faq__list {
  max-width: 48rem;
  margin: 0 auto;
}

.faq-item {
  border-top: 1px solid rgba(191, 200, 201, 0.2);
}

.faq-item:last-child {
  border-bottom: 1px solid rgba(191, 200, 201, 0.2);
}

.faq-item__button {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  text-align: left;
  padding: 2rem 0;
}

.faq-item__question {
  font-weight: 700;
  font-size: 1.25rem;
  padding-right: 2rem;
}

.faq-item__icon {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
  transition: transform 0.3s;
}

.faq-item.is-open .faq-item__icon {
  transform: rotate(45deg);
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
}

.faq-item__answer-inner {
  padding-bottom: 2rem;
  color: var(--color-on-surface-variant);
  line-height: 1.7;
  font-size: 1.0625rem;
}

.faq-item.is-open .faq-item__answer {
  max-height: 20rem;
}

/* ---------- Final CTA ---------- */
.final-cta {
  padding-top: 12rem;
  padding-bottom: 12rem;
  text-align: center;
}

.final-cta__heading {
  font-family: var(--font-headline);
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 400;
  margin-bottom: 3rem;
  max-width: 48rem;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.15;
}

.final-cta__actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2.5rem;
}

.final-cta__email-label {
  color: var(--color-on-surface-variant);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.final-cta__email {
  font-family: var(--font-headline);
  font-size: clamp(1.25rem, 3vw, 1.875rem);
  font-style: italic;
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 8px;
  text-decoration-color: rgba(0, 67, 73, 0.2);
}

.final-cta__email:hover {
  text-decoration-color: var(--color-primary);
}

/* ---------- Footer ---------- */
.footer {
  padding: 3rem var(--px);
  border-top: 1px solid rgba(226, 232, 240, 0.2);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer__logo {
  height: 22px;
  width: auto;
}

.footer__copyright {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-slate-500);
}

.footer__links {
  display: flex;
  gap: 2rem;
}

.footer__link {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-slate-500);
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: color 0.3s;
}

.footer__link:hover {
  color: var(--color-primary-container);
}

/* ---------- Responsive ---------- */
@media (min-width: 768px) {
  .nav__links {
    display: flex;
  }

  .nav__mobile-toggle {
    display: none;
  }

  .hero__actions {
    flex-direction: row;
    align-items: center;
  }

  .pain-points__grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .process__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 6rem;
  }

  .product-spotlight__features {
    grid-template-columns: 1fr 1fr;
  }

  .metrics__grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
  }
}