/* ===================================================
   AppPartner AI — interaktion.co
   Refined editorial aesthetic
   =================================================== */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,300;1,9..40,400&family=Instrument+Serif:ital@0;1&display=swap');

/* --- Tokens --- */
:root {
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body: 'DM Sans', -apple-system, sans-serif;

  --clr-bg: #FAFAF8;
  --clr-bg-alt: #F3F2EE;
  --clr-surface: #FFFFFF;
  --clr-ink: #1A1A18;
  --clr-ink-soft: #5C5C56;
  --clr-ink-muted: #9B9B92;
  --clr-accent: #2B59FF;
  --clr-accent-hover: #1A45E0;
  --clr-accent-soft: rgba(43, 89, 255, 0.08);
  --clr-border: rgba(26, 26, 24, 0.08);
  --clr-border-strong: rgba(26, 26, 24, 0.14);

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 3rem;
  --space-xl: 5rem;
  --space-2xl: 8rem;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 100px;

  --max-w: 1140px;
  --max-w-narrow: 720px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--clr-ink);
  background: var(--clr-bg);
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* --- Utility --- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.container--narrow {
  max-width: var(--max-w-narrow);
}

/* --- Reveal animation --- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.23, 1, 0.32, 1),
              transform 0.7s cubic-bezier(0.23, 1, 0.32, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ===================================================
   NAV
   =================================================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-sm) 0;
  background: var(--clr-bg);
  transition: background 0.35s, box-shadow 0.35s, padding 0.35s;
}

.nav.is-scrolled {
  background: var(--clr-bg);
  box-shadow: 0 1px 0 var(--clr-border);
  padding: 0.6rem 0;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: -0.01em;
  color: var(--clr-ink);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav__link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--clr-ink-soft);
  transition: color 0.25s;
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--clr-accent);
  transition: width 0.3s cubic-bezier(0.23, 1, 0.32, 1);
}

.nav__link:hover { color: var(--clr-ink); }
.nav__link:hover::after { width: 100%; }

.nav__cta {
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.55rem 1.3rem;
  background: var(--clr-ink);
  color: var(--clr-bg);
  border-radius: var(--radius-pill);
  transition: background 0.25s, transform 0.25s;
}

.nav__cta:hover {
  background: var(--clr-accent);
  transform: translateY(-1px);
}

/* Mobile nav toggle */
.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--clr-ink);
  margin: 5px 0;
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.nav__toggle.is-active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav__toggle.is-active span:nth-child(2) {
  opacity: 0;
}
.nav__toggle.is-active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ===================================================
   HERO
   =================================================== */
.hero {
  padding: calc(var(--space-2xl) + 3rem) 0 var(--space-2xl);
  position: relative;
  overflow: hidden;
}

.hero__mesh {
  position: absolute;
  top: -20%;
  right: -15%;
  width: 700px;
  height: 700px;
  border-radius: 50%;
  background: radial-gradient(ellipse at 30% 40%, rgba(43, 89, 255, 0.06) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 60%, rgba(120, 80, 255, 0.04) 0%, transparent 50%);
  filter: blur(60px);
  pointer-events: none;
  animation: meshFloat 12s ease-in-out infinite;
}

@keyframes meshFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-30px, 20px) scale(1.05); }
}

.hero__content {
  position: relative;
  max-width: 680px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--clr-accent);
  background: var(--clr-accent-soft);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-pill);
  margin-bottom: var(--space-md);
}

.hero__badge svg {
  width: 14px;
  height: 14px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 5.5vw, 4.2rem);
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--clr-ink);
  margin-bottom: var(--space-md);
}

.hero h1 em {
  font-style: italic;
  color: var(--clr-accent);
}

.hero__sub {
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--clr-ink-soft);
  max-width: 560px;
  margin-bottom: var(--space-xs);
}

.hero__supporting {
  font-size: 0.9rem;
  color: var(--clr-ink-muted);
  margin-bottom: var(--space-lg);
}

.hero__actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.8rem 1.6rem;
  border-radius: var(--radius-pill);
  border: none;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
}

.btn--primary {
  background: var(--clr-accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(43, 89, 255, 0.25);
}

.btn--primary:hover {
  background: var(--clr-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(43, 89, 255, 0.3);
}

.btn--secondary {
  background: transparent;
  color: var(--clr-ink);
  border: 1.5px solid var(--clr-border-strong);
}

.btn--secondary:hover {
  border-color: var(--clr-ink);
  transform: translateY(-2px);
}

.btn--large {
  padding: 1rem 2rem;
  font-size: 1.05rem;
}

.btn svg {
  width: 16px;
  height: 16px;
  transition: transform 0.3s;
}

.btn:hover svg {
  transform: translateX(3px);
}

/* ===================================================
   SECTION — shared
   =================================================== */
.section {
  padding: var(--space-2xl) 0;
}

.section--alt {
  background: var(--clr-bg-alt);
}

.section__label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--clr-accent);
  margin-bottom: var(--space-sm);
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3.5vw, 2.8rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.section__desc {
  font-size: 1.05rem;
  color: var(--clr-ink-soft);
  max-width: 560px;
  line-height: 1.65;
}

.section__header {
  margin-bottom: var(--space-xl);
}

/* ===================================================
   PRODUCT OVERVIEW — Feature cards
   =================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.feature-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-md) var(--space-md);
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
}

.feature-card:hover {
  border-color: var(--clr-border-strong);
  box-shadow: 0 4px 24px rgba(0,0,0,0.04);
  transform: translateY(-3px);
}

.feature-card__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--clr-accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-sm);
  color: var(--clr-accent);
}

.feature-card__icon svg {
  width: 22px;
  height: 22px;
}

.feature-card h3 {
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--clr-ink-soft);
  line-height: 1.55;
}

.features__closing {
  margin-top: var(--space-lg);
  font-size: 1.05rem;
  color: var(--clr-ink-soft);
}

/* ===================================================
   AI CREATION — Split layout
   =================================================== */
.creation-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.creation__list {
  margin: var(--space-md) 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.creation__list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.95rem;
  color: var(--clr-ink-soft);
}

.creation__list li svg {
  width: 20px;
  height: 20px;
  color: var(--clr-accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.creation__visual {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  position: relative;
  overflow: hidden;
}

.creation__visual::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(43, 89, 255, 0.05) 0%, transparent 70%);
  border-radius: 50%;
}

.creation__steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  position: relative;
}

.creation__step {
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
}

.creation__step-num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--clr-accent-soft);
  color: var(--clr-accent);
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.creation__step-text {
  font-size: 0.9rem;
  color: var(--clr-ink-soft);
  padding-top: 5px;
}

.creation__note {
  margin-top: var(--space-md);
  font-size: 0.95rem;
  color: var(--clr-ink-soft);
}

/* Refine sub-section */
.refine {
  margin-top: var(--space-xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--clr-border);
}

.refine__title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  line-height: 1.2;
  margin-bottom: var(--space-sm);
}

.refine__desc {
  font-size: 1rem;
  color: var(--clr-ink-soft);
  max-width: 560px;
  margin-bottom: var(--space-md);
}

.refine-examples {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-sm);
}

.refine-example {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-md);
  font-size: 0.9rem;
  color: var(--clr-ink-soft);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  transition: border-color 0.25s;
}

.refine-example:hover {
  border-color: var(--clr-accent);
}

.refine-example svg {
  width: 18px;
  height: 18px;
  color: var(--clr-accent);
  flex-shrink: 0;
}

.refine__closing {
  margin-top: var(--space-md);
  font-size: 0.95rem;
  color: var(--clr-ink-muted);
  font-style: italic;
}

/* ===================================================
   WHY — Highlight cards
   =================================================== */
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.why-card {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--clr-border);
  background: var(--clr-surface);
  transition: border-color 0.3s, transform 0.3s;
}

.why-card:hover {
  border-color: var(--clr-border-strong);
  transform: translateY(-2px);
}

.why-card__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--clr-accent-soft);
  color: var(--clr-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.75rem;
}

.why-card__icon svg {
  width: 20px;
  height: 20px;
}

.why-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.why-card p {
  font-size: 0.88rem;
  color: var(--clr-ink-soft);
  line-height: 1.55;
}

/* Highlight banner within why section */
.why-banner {
  margin-top: var(--space-lg);
  padding: var(--space-lg);
  background: linear-gradient(135deg, rgba(43, 89, 255, 0.04) 0%, rgba(120, 80, 255, 0.03) 100%);
  border: 1px solid rgba(43, 89, 255, 0.1);
  border-radius: var(--radius-lg);
  text-align: center;
}

.why-banner__quote {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.5vw, 1.7rem);
  line-height: 1.35;
  color: var(--clr-ink);
  max-width: 600px;
  margin: 0 auto var(--space-sm);
}

.why-banner__sub {
  font-size: 0.9rem;
  color: var(--clr-ink-muted);
}

/* ===================================================
   PLATFORM — Tech grid
   =================================================== */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.platform-item {
  text-align: center;
  padding: var(--space-md);
}

.platform-item__icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--clr-accent-soft);
  color: var(--clr-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-sm);
}

.platform-item__icon svg {
  width: 24px;
  height: 24px;
}

.platform-item h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.platform-item p {
  font-size: 0.85rem;
  color: var(--clr-ink-soft);
}

.platform__closing {
  margin-top: var(--space-lg);
  font-size: 1rem;
  color: var(--clr-ink-soft);
  max-width: 600px;
}

/* ===================================================
   CTA FINAL
   =================================================== */
.cta-final {
  padding: var(--space-2xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-final__mesh {
  position: absolute;
  bottom: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(43, 89, 255, 0.06) 0%, transparent 65%);
  filter: blur(60px);
  pointer-events: none;
}

.cta-final__content {
  position: relative;
}

.cta-final h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.cta-final__desc {
  font-size: 1.1rem;
  color: var(--clr-ink-soft);
  max-width: 520px;
  margin: 0 auto var(--space-lg);
}

.cta-final__micro {
  margin-top: var(--space-md);
  font-size: 0.85rem;
  color: var(--clr-ink-muted);
}

/* ===================================================
   FOOTER
   =================================================== */
.footer {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--clr-border);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.footer__brand {
  font-family: var(--font-display);
  font-size: 1.1rem;
}

.footer__links {
  display: flex;
  gap: var(--space-md);
  font-size: 0.85rem;
  color: var(--clr-ink-soft);
}

.footer__links a {
  transition: color 0.25s;
}

.footer__links a:hover {
  color: var(--clr-accent);
}

.footer__copy {
  font-size: 0.8rem;
  color: var(--clr-ink-muted);
  width: 100%;
  text-align: center;
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--clr-border);
}

/* ===================================================
   RESPONSIVE
   =================================================== */
@media (max-width: 900px) {
  .creation-split {
    grid-template-columns: 1fr;
  }

  .platform-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 700px) {
  .nav__links {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 280px;
    background: var(--clr-bg);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    flex-direction: column;
    align-items: flex-start;
    padding: 5rem var(--space-md) var(--space-md);
    gap: var(--space-sm);
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.23, 1, 0.32, 1);
    box-shadow: -8px 0 30px rgba(0,0,0,0.08);
  }

  .nav__links.is-open {
    transform: translateX(0);
  }

  .nav__toggle {
    display: block;
    z-index: 101;
  }

  .hero h1 {
    font-size: clamp(2rem, 7vw, 2.6rem);
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .why-grid {
    grid-template-columns: 1fr;
  }

  .platform-grid {
    grid-template-columns: 1fr;
    text-align: left;
  }

  .platform-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    text-align: left;
  }

  .platform-item__icon {
    margin: 0;
    flex-shrink: 0;
  }

  .footer__inner {
    flex-direction: column;
    text-align: center;
  }

  .footer__links {
    justify-content: center;
  }
}