/* ============================================
   YAFFS.net Design System
   Modern static site — no framework dependency
   ============================================ */

/* --- Custom Properties --- */
:root {
  --color-primary: #1a2332;
  --color-accent: #2d7ff9;
  --color-accent-hover: #1b6de8;
  --color-teal: #0d9488;
  --color-teal-hover: #0b7f74;
  --color-bg-light: #f8fafc;
  --color-bg-white: #ffffff;
  --color-text: #334155;
  --color-heading: #1e293b;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-card-shadow: rgba(0, 0, 0, 0.06);

  --font-heading: 'Inter', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;

  --fs-hero: clamp(2.5rem, 5vw, 4rem);
  --fs-h1: clamp(2rem, 4vw, 3rem);
  --fs-h2: clamp(1.5rem, 3vw, 2.25rem);
  --fs-h3: clamp(1.15rem, 2vw, 1.5rem);
  --fs-body: clamp(1rem, 1.2vw, 1.125rem);
  --fs-small: 0.875rem;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-section: clamp(4rem, 8vw, 7rem);

  --max-width: 1200px;
  --nav-height: 72px;
  --radius: 8px;
  --radius-lg: 12px;
}

/* --- 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);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-heading);
  line-height: 1.2;
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

ul, ol {
  padding-left: 1.5em;
}

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

.section {
  padding: var(--space-section) 0;
}

.section--light {
  background: var(--color-bg-light);
}

.section--dark {
  background: var(--color-primary);
  color: #cbd5e1;
}

.section--dark h2,
.section--dark h3 {
  color: #ffffff;
}

.section--accent {
  background: var(--color-accent);
  color: #ffffff;
}

.section--accent h2 {
  color: #ffffff;
}

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

.text-muted {
  color: var(--color-text-muted);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto var(--space-2xl);
}

.section-header p {
  margin-top: var(--space-sm);
  color: var(--color-text-muted);
  font-size: var(--fs-body);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.15s;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn--primary {
  background: var(--color-accent);
  color: #ffffff;
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #ffffff;
}

.btn--secondary {
  background: transparent;
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.5);
}

.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #ffffff;
  color: #ffffff;
}

.btn--outline {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn--outline:hover {
  background: var(--color-accent);
  color: #ffffff;
}

.btn--white {
  background: #ffffff;
  color: var(--color-accent);
  border-color: #ffffff;
}

.btn--white:hover {
  background: #f1f5f9;
  color: var(--color-accent-hover);
}

.btn--teal {
  background: var(--color-teal);
  color: #ffffff;
  border-color: var(--color-teal);
}

.btn--teal:hover {
  background: var(--color-teal-hover);
  border-color: var(--color-teal-hover);
  color: #ffffff;
}

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

/* --- Navigation --- */
.nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-primary);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.nav__logo img {
  height: 36px;
  width: auto;
}

.nav__logo span {
  font-weight: 700;
  font-size: 1.25rem;
  color: #ffffff;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav__links a {
  color: #cbd5e1;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  font-size: var(--fs-small);
  font-weight: 500;
  transition: color 0.2s, background 0.2s;
  white-space: nowrap;
}

.nav__links a:hover,
.nav__links a.active {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
}

.nav__cta {
  margin-left: 0.5rem;
}

.nav__cta .btn {
  padding: 0.6rem 1.25rem;
  font-size: var(--fs-small);
}

.nav__toggle {
  display: none;
  background: none;
  border: none;
  color: #ffffff;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
}

/* Mobile nav */
@media (max-width: 900px) {
  .nav__toggle {
    display: block;
  }

  .nav__menu {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-primary);
    padding: var(--space-sm) var(--space-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    flex-direction: column;
  }

  .nav__menu.open {
    display: flex;
  }

  .nav__links {
    flex-direction: column;
    align-items: stretch;
  }

  .nav__links a {
    padding: 0.75rem var(--space-sm);
    font-size: 1rem;
  }

  .nav__cta {
    margin-left: 0;
    margin-top: var(--space-sm);
  }

  .nav__cta .btn {
    width: 100%;
    justify-content: center;
  }
}

/* --- Hero --- */
.hero {
  background: var(--color-primary);
  padding: clamp(4rem, 10vw, 8rem) 0 clamp(3rem, 6vw, 5rem);
  color: #cbd5e1;
  text-align: center;
}

.hero h1 {
  font-size: var(--fs-hero);
  color: #ffffff;
  max-width: 800px;
  margin: 0 auto var(--space-md);
}

.hero__sub {
  font-size: clamp(1.05rem, 1.5vw, 1.25rem);
  max-width: 640px;
  margin: 0 auto var(--space-lg);
  line-height: 1.7;
  color: #94a3b8;
}

.hero .btn-group {
  justify-content: center;
  margin-bottom: var(--space-2xl);
}

/* --- Trust Strip (logo bar) --- */
.trust-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding: var(--space-lg) 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.trust-strip img {
  height: 32px;
  width: auto;
  opacity: 0.6;
  filter: brightness(0) invert(1);
  transition: opacity 0.2s;
}

.trust-strip img:hover {
  opacity: 1;
}

/* --- Card Grid --- */
.card-grid {
  display: grid;
  gap: var(--space-lg);
}

.card-grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

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

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

@media (max-width: 900px) {
  .card-grid--3,
  .card-grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .card-grid--3,
  .card-grid--2,
  .card-grid--4 {
    grid-template-columns: 1fr;
  }
}

/* --- Cards --- */
.card {
  background: var(--color-bg-white);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: 0 1px 3px var(--color-card-shadow), 0 4px 16px var(--color-card-shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--color-card-shadow), 0 8px 32px var(--color-card-shadow);
}

.card__icon {
  font-size: 2rem;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.card__icon--teal {
  color: var(--color-teal);
}

.card h3 {
  margin-bottom: 0.5rem;
}

.card p {
  color: var(--color-text-muted);
  font-size: var(--fs-small);
  line-height: 1.6;
}

.card a {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  margin-top: var(--space-sm);
  font-size: var(--fs-small);
  font-weight: 600;
}

/* --- Feature Callout (side-by-side) --- */
.feature-callout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

.feature-callout--reverse {
  direction: rtl;
}

.feature-callout--reverse > * {
  direction: ltr;
}

.feature-callout__content h2 {
  margin-bottom: var(--space-sm);
}

.feature-callout__content p {
  margin-bottom: var(--space-md);
  color: var(--color-text-muted);
}

.feature-callout__image {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.feature-callout__image img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
}

@media (max-width: 768px) {
  .feature-callout,
  .feature-callout--reverse {
    grid-template-columns: 1fr;
    direction: ltr;
    gap: var(--space-lg);
  }
}

/* --- Stat Grid --- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  text-align: center;
}

.stat-grid__item h3 {
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--color-accent);
  margin-bottom: 0.25rem;
}

.stat-grid__item p {
  font-size: var(--fs-small);
  color: var(--color-text-muted);
}

.section--dark .stat-grid__item h3 {
  color: var(--color-accent);
}

.section--dark .stat-grid__item p {
  color: #94a3b8;
}

@media (max-width: 768px) {
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .stat-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Testimonial --- */
.testimonial {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}

.testimonial__quote {
  font-size: clamp(1.1rem, 1.8vw, 1.35rem);
  font-style: italic;
  line-height: 1.8;
  color: var(--color-heading);
  margin-bottom: var(--space-md);
  position: relative;
}

.testimonial__quote::before {
  content: "\201C";
  font-size: 4rem;
  color: var(--color-accent);
  opacity: 0.3;
  position: absolute;
  top: -1.5rem;
  left: -0.5rem;
  font-family: Georgia, serif;
  line-height: 1;
}

.testimonial__author {
  font-weight: 600;
  color: var(--color-heading);
}

.testimonial__role {
  font-size: var(--fs-small);
  color: var(--color-text-muted);
}

/* --- CTA Banner --- */
.cta-banner {
  text-align: center;
  padding: var(--space-2xl) var(--space-md);
}

.cta-banner h2 {
  margin-bottom: var(--space-sm);
}

.cta-banner p {
  margin-bottom: var(--space-lg);
  opacity: 0.9;
}

.cta-banner .btn-group {
  justify-content: center;
}

/* --- Footer --- */
.footer {
  background: var(--color-primary);
  color: #94a3b8;
  padding: var(--space-2xl) 0 var(--space-lg);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer__brand p {
  font-size: var(--fs-small);
  line-height: 1.7;
  margin-top: var(--space-sm);
}

.footer h4 {
  color: #ffffff;
  font-size: var(--fs-small);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.footer ul {
  list-style: none;
  padding: 0;
}

.footer ul li {
  margin-bottom: 0.4rem;
}

.footer ul a {
  color: #94a3b8;
  font-size: var(--fs-small);
  transition: color 0.2s;
}

.footer ul a:hover {
  color: #ffffff;
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--fs-small);
}

@media (max-width: 768px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .footer__grid {
    grid-template-columns: 1fr;
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
}

/* --- Pricing Table --- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  max-width: 900px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--color-bg-white);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl) var(--space-lg);
  box-shadow: 0 1px 3px var(--color-card-shadow), 0 4px 16px var(--color-card-shadow);
  text-align: center;
  position: relative;
}

.pricing-card--featured {
  border: 2px solid var(--color-accent);
}

.pricing-card__badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 1rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-card h3 {
  margin-bottom: 0.5rem;
}

.pricing-card__price {
  font-size: clamp(2rem, 3vw, 2.5rem);
  font-weight: 700;
  color: var(--color-heading);
  margin: var(--space-sm) 0;
}

.pricing-card__price span {
  font-size: var(--fs-small);
  font-weight: 400;
  color: var(--color-text-muted);
}

.pricing-card ul {
  list-style: none;
  padding: 0;
  margin: var(--space-md) 0 var(--space-lg);
  text-align: left;
}

.pricing-card ul li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--fs-small);
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.pricing-card ul li i {
  color: var(--color-teal);
  margin-top: 0.15rem;
  flex-shrink: 0;
}

@media (max-width: 600px) {
  .pricing-grid {
    grid-template-columns: 1fr;
  }
}

/* --- FAQ --- */
.faq-list {
  max-width: 780px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
}

.faq-item h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--color-heading);
}

.faq-item p {
  color: var(--color-text-muted);
  font-size: var(--fs-small);
  line-height: 1.7;
}

/* --- Page Hero (secondary pages) --- */
.page-hero {
  background: var(--color-primary);
  padding: clamp(3rem, 6vw, 5rem) 0;
  text-align: center;
  color: #cbd5e1;
}

.page-hero h1 {
  color: #ffffff;
  margin-bottom: var(--space-sm);
}

.page-hero p {
  max-width: 600px;
  margin: 0 auto;
  color: #94a3b8;
  font-size: clamp(1rem, 1.3vw, 1.15rem);
}

/* --- Feature Sections (features page) --- */
.feature-section {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-lg);
  align-items: start;
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-border);
}

.feature-section:last-child {
  border-bottom: none;
}

.feature-section__icon {
  width: 56px;
  height: 56px;
  background: var(--color-bg-light);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--color-accent);
  flex-shrink: 0;
}

.feature-section__content h3 {
  margin-bottom: 0.5rem;
}

.feature-section__content p {
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

@media (max-width: 600px) {
  .feature-section {
    grid-template-columns: 1fr;
  }
}

/* --- Industry Grid --- */
.industry-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.industry-card {
  background: var(--color-bg-white);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: 0 1px 3px var(--color-card-shadow), 0 4px 16px var(--color-card-shadow);
}

.industry-card__icon {
  font-size: 2rem;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.industry-card h3 {
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.industry-card p {
  color: var(--color-text-muted);
  font-size: var(--fs-small);
  line-height: 1.6;
}

@media (max-width: 900px) {
  .industry-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .industry-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Case Study --- */
.case-study {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
  padding: var(--space-lg) 0;
}

.case-study__content h3 {
  margin-bottom: var(--space-sm);
}

.case-study__content p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.case-study__content blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-md);
  font-style: italic;
  color: var(--color-heading);
  margin: var(--space-md) 0;
}

.case-study__image {
  text-align: center;
}

.case-study__image img {
  border-radius: var(--radius-lg);
  max-width: 100%;
}

@media (max-width: 768px) {
  .case-study {
    grid-template-columns: 1fr;
  }
}

/* --- Contact --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
}

.contact-info__item {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.contact-info__item i {
  color: var(--color-accent);
  font-size: 1.25rem;
  margin-top: 0.2rem;
  flex-shrink: 0;
}

.contact-info__item h3 {
  font-size: 1rem;
  margin-bottom: 0.15rem;
}

.contact-info__item p,
.contact-info__item a {
  font-size: var(--fs-small);
  color: var(--color-text-muted);
}

@media (max-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

/* --- About Page --- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  max-width: 700px;
  margin: 0 auto;
}

.team-card {
  background: var(--color-bg-white);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  box-shadow: 0 1px 3px var(--color-card-shadow), 0 4px 16px var(--color-card-shadow);
}

.team-card__avatar {
  width: 80px;
  height: 80px;
  background: var(--color-bg-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-sm);
  font-size: 2rem;
  color: var(--color-accent);
}

.team-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.15rem;
}

.team-card p {
  color: var(--color-text-muted);
  font-size: var(--fs-small);
}

@media (max-width: 600px) {
  .team-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Logo Strip (light background variant) --- */
.logo-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: clamp(2rem, 4vw, 3.5rem);
  padding: var(--space-lg) 0;
}

.logo-strip img {
  height: 36px;
  width: auto;
  opacity: 0.5;
  filter: grayscale(100%);
  transition: opacity 0.2s, filter 0.2s;
}

.logo-strip img:hover {
  opacity: 1;
  filter: grayscale(0%);
}

/* --- Highlight list (check marks) --- */
.check-list {
  list-style: none;
  padding: 0;
}

.check-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.5rem 0;
  font-size: var(--fs-small);
}

.check-list li i {
  color: var(--color-teal);
  margin-top: 0.2rem;
  flex-shrink: 0;
}

/* --- Doc Card specific --- */
.doc-card {
  display: flex;
  flex-direction: column;
}

.doc-card .card__icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-sm);
}

.doc-card h3 {
  flex-grow: 0;
}

.doc-card p {
  flex-grow: 1;
}

.doc-card a.doc-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: auto;
  padding-top: var(--space-sm);
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--color-accent);
}

/* --- Misc --- */
.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-lg) 0;
}

.badge {
  display: inline-block;
  background: var(--color-bg-light);
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.75rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.highlight-box {
  background: var(--color-bg-light);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-md) 0;
}

.highlight-box p {
  margin: 0;
  color: var(--color-text);
}