/* ============================================================
   RENEW AUS TECH — Design System & Main Styles
   Vanilla CSS, mobile-first, WCAG AA focused
   ============================================================ */

:root {
  /* Brand Colors — Black & Grey only */
  --color-primary: #0D0D0D;
  --color-primary-light: #1A1A1A;
  --color-primary-dark: #000000;
  --color-accent: #2A2A2A;
  --color-accent-hover: #111111;
  --color-accent-soft: rgba(0, 0, 0, 0.06);
  --color-success: #333333;
  --color-warning: #555555;

  /* Neutrals */
  --color-text: #111111;
  --color-text-muted: #666666;
  --color-text-inverse: #FFFFFF;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F5F5F5;
  --color-bg-dark: #0D0D0D;
  --color-border: #E5E5E5;
  --color-border-strong: #D0D0D0;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Inter', system-ui, sans-serif;

  /* Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 800px;
  --header-height: 72px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.12);
  --shadow-card-hover: 0 12px 28px rgba(0, 0, 0, 0.12);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s ease;

  /* Z-index */
  --z-header: 100;
  --z-overlay: 200;
  --z-modal: 300;
}

/* 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-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, picture, video, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
  border: none;
  background: none;
}

button {
  cursor: pointer;
}

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

h1 { font-size: clamp(2rem, 5vw, var(--text-5xl)); }
h2 { font-size: clamp(1.5rem, 4vw, var(--text-4xl)); }
h3 { font-size: clamp(1.25rem, 3vw, var(--text-2xl)); }
h4 { font-size: var(--text-xl); }

p {
  margin-bottom: var(--space-4);
}

p:last-child {
  margin-bottom: 0;
}

/* Utilities */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

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

.section {
  padding: var(--space-16) 0;
}

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

.section--dark {
  background-color: var(--color-bg-dark);
  color: var(--color-text-inverse);
}

.section--dark h2,
.section--dark h3 {
  color: var(--color-text-inverse);
}

.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.text-accent { color: var(--color-primary); }

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.875rem 1.75rem;
  font-weight: 600;
  font-size: var(--text-base);
  line-height: 1.25;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  text-align: center;
  white-space: nowrap;
  min-height: 48px; /* touch target */
}

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background-color: var(--color-primary-light);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
  transform: translateY(-1px);
}

.btn--secondary {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn--secondary:hover,
.btn--secondary:focus-visible {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn--outline-light {
  background-color: transparent;
  color: var(--color-text-inverse);
  border: 2px solid rgba(255, 255, 255, 0.7);
}

.btn--outline-light:hover,
.btn--outline-light:focus-visible {
  background-color: rgba(255, 255, 255, 0.15);
  border-color: #fff;
}

.btn--lg {
  padding: 1rem 2rem;
  font-size: var(--text-lg);
  min-height: 56px;
}

.btn--full {
  width: 100%;
}

/* Cards */
.card {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: var(--shadow-card-hover);
}

.card__image {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--color-bg-alt);
}

.card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.card:hover .card__image img {
  transform: scale(1.05);
}

.card__body {
  padding: var(--space-6);
}

.card__title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-2);
}

.card__text {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
}

.card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  color: var(--color-primary);
  font-size: var(--text-sm);
}

.card__link:hover {
  gap: var(--space-3);
}

/* Header / Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 700;
  font-size: var(--text-xl);
  color: var(--color-primary);
  line-height: 0;
}

.logo img {
  display: block;
  height: 40px;
  width: auto;
}

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

.nav {
  display: none;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav__link {
  font-weight: 500;
  font-size: var(--text-sm);
  color: var(--color-text);
  position: relative;
  padding: var(--space-2) 0;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-base);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

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

.header-cta {
  display: none;
}

.menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px;
  z-index: 110;
}

.menu-toggle span {
  display: block;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Nav */
.mobile-nav {
  position: fixed;
  inset: 0;
  background: var(--color-bg);
  z-index: 105;
  display: flex;
  flex-direction: column;
  padding: calc(var(--header-height) + var(--space-8)) var(--space-6) var(--space-8);
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  visibility: hidden;
}

.mobile-nav.is-open {
  transform: translateX(0);
  visibility: visible;
}

.mobile-nav__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.mobile-nav__link {
  display: block;
  padding: var(--space-4) 0;
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav__cta {
  margin-top: auto;
}

/* Hero with Ken Burns */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  color: var(--color-text-inverse);
}

.hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__media img,
.hero__media .ken-burns {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.ken-burns {
  animation: kenBurns 12s ease-out forwards;
  transform-origin: center center;
}

@keyframes kenBurns {
  0% {
    transform: scale(1) translate(0, 0);
  }
  100% {
    transform: scale(1.08) translate(-1.5%, -1%);
  }
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    105deg,
    rgba(0, 0, 0, 0.75) 0%,
    rgba(0, 0, 0, 0.5) 50%,
    rgba(0, 0, 0, 0.25) 100%
  );
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
  padding: var(--space-20) 0 var(--space-16);
  max-width: 680px;
}

.hero__eyebrow {
  display: inline-block;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--space-4);
}

.hero__title {
  color: var(--color-text-inverse);
  margin-bottom: var(--space-5);
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

.hero__subtitle {
  font-size: var(--text-lg);
  opacity: 0.92;
  margin-bottom: var(--space-8);
  line-height: 1.6;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* Trust Bar */
.trust-bar {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-6) 0;
}

.trust-bar__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
  text-align: center;
}

.trust-item__value {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.1;
}

.trust-item__label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* Service Cards Grid */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.service-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.service-card__icon {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.6rem;
  margin-bottom: var(--space-4);
}

/* Why Us / Features */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

.feature {
  text-align: center;
  padding: var(--space-4);
}

.feature__icon {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.65rem;
  margin: 0 auto var(--space-4);
}

.feature__title {
  margin-bottom: var(--space-2);
}

.feature__text {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* FAQ Accordion */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

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

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

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) 0;
  text-align: left;
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--color-primary);
}

.faq-question svg {
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

.faq-item[aria-expanded="true"] .faq-question svg {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-item[aria-expanded="true"] .faq-answer {
  max-height: 400px;
  padding-bottom: var(--space-5);
}

.faq-answer p {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* CTA Banner */
.cta-banner {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: var(--color-text-inverse);
  padding: var(--space-16) 0;
  text-align: center;
}

.cta-banner h2 {
  color: var(--color-text-inverse);
  margin-bottom: var(--space-4);
}

.cta-banner p {
  opacity: 0.9;
  margin-bottom: var(--space-8);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* Footer */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.8);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

.footer-brand .logo {
  color: #fff;
  margin-bottom: var(--space-4);
}

.footer-brand .logo img {
  height: 36px;
}

.footer-brand p {
  font-size: var(--text-sm);
  line-height: 1.6;
  max-width: 280px;
}

.footer-col h4 {
  color: #fff;
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-links a {
  font-size: var(--text-sm);
  opacity: 0.8;
  transition: opacity var(--transition-fast);
}

.footer-links a:hover {
  opacity: 1;
  color: var(--color-primary);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  font-size: var(--text-sm);
  opacity: 0.7;
}

/* Form Styles */
.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-weight: 600;
  font-size: var(--text-sm);
  margin-bottom: var(--space-2);
  color: var(--color-primary);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 1.5px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  min-height: 48px;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-hint {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.form-step {
  display: none;
}

.form-step.is-active {
  display: block;
  animation: fadeInUp 0.35s ease;
}

.form-progress {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
}

.form-progress__dot {
  height: 4px;
  flex: 1;
  background: var(--color-border);
  border-radius: 2px;
  transition: background var(--transition-base);
}

.form-progress__dot.is-active {
  background: var(--color-primary);
}

/* Reveal animations */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.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; }

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Page Hero (inner pages) */
.page-hero {
  position: relative;
  padding: var(--space-20) 0 var(--space-16);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  overflow: hidden;
}

.page-hero .ken-burns {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}

.page-hero__content {
  position: relative;
  z-index: 2;
  max-width: 700px;
}

.page-hero h1 {
  color: var(--color-text-inverse);
  margin-bottom: var(--space-4);
}

.page-hero p {
  font-size: var(--text-lg);
  opacity: 0.9;
}

/* Contact specific */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.contact-info__item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--color-border);
}

.contact-info__item:first-child {
  padding-top: 0;
}

.contact-info__item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.contact-info__label {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.contact-info__value {
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--color-primary);
  line-height: 1.45;
  word-break: break-word;
}

a.contact-info__value:hover {
  text-decoration: underline;
}

/* Responsive */
@media (min-width: 640px) {
  .trust-bar__grid {
    grid-template-columns: repeat(4, 1fr);
  }

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

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

@media (min-width: 768px) {
  .nav {
    display: block;
  }

  .header-cta {
    display: block;
  }

  .menu-toggle {
    display: none;
  }

  .mobile-nav {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
  }

  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  .contact-grid {
    grid-template-columns: 1fr 1.2fr;
  }
}

@media (min-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .section {
    padding: var(--space-20) 0;
  }
}

/* Suppliers infinite carousel */
.suppliers-carousel {
  width: 100%;
  overflow: hidden;
  mask-image: linear-gradient(to right, transparent, black 8%, black 92%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black 8%, black 92%, transparent);
  padding: 0.5rem 0 1rem;
}

.suppliers-track {
  display: flex;
  align-items: center;
  gap: 3.5rem;
  width: max-content;
  animation: suppliers-scroll 40s linear infinite;
}

.suppliers-track:hover {
  animation-play-state: paused;
}

.suppliers-slide {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 56px;
  padding: 0 0.5rem;
}

.suppliers-slide img {
  height: 40px;
  width: auto;
  max-width: 160px;
  object-fit: contain;
  filter: grayscale(100%);
  opacity: 0.7;
  transition: filter 0.3s ease, opacity 0.3s ease;
}

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

@keyframes suppliers-scroll {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

/* Focus visible for accessibility */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
  .ken-burns {
    animation: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .suppliers-track {
    animation: none;
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
    gap: 2rem;
  }

  html {
    scroll-behavior: auto;
  }
}