/* ============================================
   CHATTY — Product Website Style System
   Dark, editorial, teal/cyan accents
   Inspired by SWAI (smartweavers.com) but with
   Chatty's own brand identity
   ============================================ */

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

:root {
  /* Accent Colors — EASY TO CHANGE
     To switch the accent color, update these 4 values:
     --accent, --accent-light, --accent-dim, --accent-glow */
  --accent: #00D4AA;
  --accent-light: #33F0C8;
  --accent-dim: rgba(0, 212, 170, 0.12);
  --accent-glow: rgba(0, 212, 170, 0.25);

  /* Background Colors */
  --bg-deep: #06060b;
  --bg-surface: #0c0c14;
  --bg-card: #11111b;
  --bg-card-hover: #16162a;

  /* Border Colors */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-accent: rgba(0, 212, 170, 0.3);

  /* Text Colors */
  --text-primary: #e8e6e3;
  --text-secondary: #8a8a9a;
  --text-muted: #5a5a6a;

  /* Featured Background */
  --featured-bg: linear-gradient(
    135deg,
    rgba(0, 212, 170, 0.08),
    rgba(0, 212, 170, 0.02)
  );
  --featured-border: rgba(0, 212, 170, 0.2);

  /* Typography */
  --font-body:
    "Inter", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", monospace;

  /* Spacing */
  --section-padding: 120px;
  --container-max: 1200px;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--accent-light);
}

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

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  padding: 2px 6px;
  background: var(--accent-dim);
  border-radius: 4px;
  color: var(--accent);
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Navigation --- */
#nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition:
    background-color 0.3s ease,
    backdrop-filter 0.3s ease;
}

#nav.scrolled {
  background-color: rgba(6, 6, 11, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

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

.logo-icon {
  font-size: 1.4rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-cta {
  background: var(--accent);
  color: var(--bg-deep) !important;
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease !important;
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow);
  color: var(--bg-deep) !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition:
    transform 0.3s ease,
    opacity 0.3s ease;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-deep);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px var(--accent-glow);
  color: var(--bg-deep);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--border-accent);
  padding: 12px 24px;
  font-size: 0.9rem;
}

.btn-outline:hover {
  background: var(--accent-dim);
  color: var(--accent-light);
}

/* --- Hero --- */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 80px;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(
    circle,
    rgba(0, 212, 170, 0.08) 0%,
    rgba(0, 212, 170, 0.03) 35%,
    transparent 70%
  );
  pointer-events: none;
  z-index: 0;
}

.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 60% 50% at 50% 40%, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 60% 50% at 50% 40%, black 30%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: var(--accent-dim);
  border: 1px solid var(--border-accent);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 28px;
}

#hero h1 {
  font-size: clamp(2.4rem, 5.5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

#hero h1.fading {
  opacity: 0;
  transition: opacity 0.4s ease;
}

#hero h1:not(.fading) {
  opacity: 1;
  transition: opacity 0.4s ease;
}

.hero-highlight {
  color: var(--accent);
  position: relative;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.hero-proof {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.proof-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.proof-number {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent);
  font-family: var(--font-mono);
}

.proof-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.proof-divider {
  width: 1px;
  height: 40px;
  background: var(--border-subtle);
}

/* --- Section Headers --- */
.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
  font-family: var(--font-mono);
}

.section-header h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-header p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* --- How It Works (Process) --- */
#how-it-works {
  padding: var(--section-padding) 0;
  background: var(--bg-surface);
}

.process-steps {
  display: flex;
  align-items: stretch;
  gap: 0;
  max-width: 960px;
  margin: 0 auto;
}

.process-step {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0 32px;
}

.step-number {
  font-size: 3rem;
  font-weight: 900;
  color: var(--accent);
  font-family: var(--font-mono);
  line-height: 1;
  margin-bottom: 12px;
  opacity: 0.5;
}

.step-icon {
  font-size: 2rem;
  margin-bottom: 20px;
}

.step-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.step-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.process-connector {
  width: 1px;
  background: linear-gradient(
    to bottom,
    transparent,
    var(--accent),
    transparent
  );
  align-self: stretch;
  opacity: 0.3;
}

/* --- Features --- */
#features {
  padding: var(--section-padding) 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  transition:
    transform 0.3s ease,
    border-color 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-accent);
}

.feature-card.featured {
  background: var(--featured-bg);
  border-color: var(--featured-border);
  position: relative;
}

.feature-card.featured::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-md);
  padding: 1px;
  background: linear-gradient(135deg, var(--accent), transparent 60%);
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Pricing --- */
#pricing {
  padding: var(--section-padding) 0;
  background: var(--bg-surface);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: start;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  transition:
    transform 0.3s ease,
    border-color 0.3s ease;
  position: relative;
}

.pricing-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-accent);
}

.pricing-featured {
  background: var(--featured-bg);
  border-color: var(--featured-border);
}

.pricing-featured::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-lg);
  padding: 1px;
  background: linear-gradient(135deg, var(--accent), transparent 60%);
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.pricing-popular {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: var(--bg-deep);
  padding: 4px 16px;
  border-radius: 100px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.pricing-tier {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 16px;
  font-family: var(--font-mono);
}

.pricing-price {
  margin-bottom: 12px;
}

.price-amount {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.price-period {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 400;
}

.pricing-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.5;
}

.pricing-features {
  list-style: none;
  margin-bottom: 28px;
  flex-grow: 1;
}

.pricing-features li {
  padding: 7px 0;
  color: var(--text-secondary);
  font-size: 0.86rem;
  position: relative;
  padding-left: 22px;
}

.pricing-features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
  font-size: 0.85rem;
}

.pricing-cta {
  width: 100%;
  justify-content: center;
  text-align: center;
}

.pricing-setup {
  margin-top: 12px;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: center;
}

.pricing-note {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-top: 48px;
  line-height: 1.8;
}

/* --- Industries --- */
#industries {
  padding: var(--section-padding) 0;
}

.industries-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.industry-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  transition:
    transform 0.3s ease,
    border-color 0.3s ease;
}

.industry-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-accent);
}

.industry-icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.industry-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.industry-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.industry-tag {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: 4px;
  background: var(--accent-dim);
  color: var(--accent);
  font-family: var(--font-mono);
}

/* --- Proof Banner --- */
#proof {
  padding: 80px 0;
  background: var(--bg-surface);
}

.proof-banner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.proof-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.proof-stat-number {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--accent);
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
}

.proof-stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* --- FAQ --- */
#faq {
  padding: var(--section-padding) 0;
}

.faq-list {
  max-width: 740px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border-subtle);
}

.faq-item:first-child {
  border-top: 1px solid var(--border-subtle);
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0;
  background: none;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: color 0.2s ease;
}

.faq-question:hover {
  color: var(--accent);
}

.faq-chevron {
  font-size: 1.2rem;
  color: var(--text-muted);
  transition: transform 0.3s ease;
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
  color: var(--accent);
}

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

.faq-item.open .faq-answer {
  max-height: 300px;
}

.faq-answer p {
  padding-bottom: 24px;
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* --- Contact --- */
#contact {
  padding: var(--section-padding) 0;
  background: var(--bg-surface);
}

.contact-layout {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 64px;
  align-items: center;
}

.contact-text .section-tag {
  display: block;
  text-align: left;
  margin-bottom: 12px;
}

.contact-text h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.contact-text p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 16px;
  line-height: 1.7;
}

.contact-quote {
  color: var(--accent) !important;
  font-size: 0.9rem !important;
  border-left: 2px solid var(--accent);
  padding-left: 16px;
  margin-top: 24px;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition:
    border-color 0.3s ease,
    transform 0.2s ease;
  color: var(--text-primary);
}

.contact-card:hover {
  border-color: var(--border-accent);
  transform: translateX(4px);
  color: var(--text-primary);
}

.contact-icon {
  font-size: 1.6rem;
  flex-shrink: 0;
}

.contact-label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  display: block;
}

.contact-value {
  font-size: 0.95rem;
  color: var(--text-secondary);
  display: block;
}

/* --- Footer --- */
footer {
  padding: 40px 0;
  border-top: 1px solid var(--border-subtle);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1rem;
}

.footer-powered {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-left: 8px;
}

.footer-powered a {
  color: var(--text-secondary);
}

.footer-powered a:hover {
  color: var(--accent);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-legal {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* --- Scroll Reveal Animation --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}

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

/* Stagger children */
.features-grid .reveal:nth-child(2),
.pricing-grid .reveal:nth-child(2),
.industries-grid .reveal:nth-child(2) {
  transition-delay: 0.1s;
}
.features-grid .reveal:nth-child(3),
.pricing-grid .reveal:nth-child(3),
.industries-grid .reveal:nth-child(3) {
  transition-delay: 0.2s;
}
.features-grid .reveal:nth-child(4),
.pricing-grid .reveal:nth-child(4),
.industries-grid .reveal:nth-child(4) {
  transition-delay: 0.3s;
}
.features-grid .reveal:nth-child(5) {
  transition-delay: 0.1s;
}
.features-grid .reveal:nth-child(6) {
  transition-delay: 0.2s;
}
.features-grid .reveal:nth-child(7) {
  transition-delay: 0.3s;
}
.features-grid .reveal:nth-child(8) {
  transition-delay: 0.4s;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .features-grid,
  .pricing-grid,
  .industries-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .proof-banner {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .process-steps {
    flex-direction: column;
    gap: 32px;
  }

  .process-connector {
    width: 40px;
    height: 1px;
    align-self: center;
    background: linear-gradient(
      to right,
      transparent,
      var(--accent),
      transparent
    );
  }

  .contact-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 80px;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(6, 6, 11, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 28px;
    z-index: 999;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    font-size: 1.2rem;
  }

  .nav-toggle {
    display: flex;
    z-index: 1001;
  }

  #hero {
    padding: 100px 20px 60px;
    min-height: auto;
  }

  #hero h1 {
    font-size: 2rem;
  }

  .hero-sub {
    font-size: 0.95rem;
  }

  .hero-proof {
    gap: 20px;
  }

  .proof-number {
    font-size: 1.4rem;
  }

  .features-grid,
  .pricing-grid,
  .industries-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .proof-banner {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .proof-stat-number {
    font-size: 1.8rem;
  }

  .pricing-popular {
    position: static;
    transform: none;
    display: inline-block;
    margin-bottom: 12px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .footer-links {
    flex-wrap: wrap;
    gap: 16px;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    justify-content: center;
  }

  .hero-proof {
    flex-direction: column;
    gap: 16px;
  }

  .proof-divider {
    width: 40px;
    height: 1px;
  }
}