/* ========================================
   R & C Tire Lab — Custom Styles
   Charcoal + Coral | Editorial Design
======================================== */

/* --- CSS Custom Properties --- */
:root {
  --color-charcoal: #1a1a1a;
  --color-charcoal-light: #2d2d2d;
  --color-charcoal-mid: #3a3a3a;
  --color-coral: #e8645a;
  --color-coral-light: #f07e75;
  --color-coral-dark: #c94e44;
  --color-cream: #f5f0eb;
  --color-cream-light: #faf7f4;
  --color-white: #ffffff;
  --color-text: #1a1a1a;
  --color-text-light: #6b6b6b;
  --color-text-muted: #999999;
  --color-border: #e0d8d0;
  
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --space-4xl: 8rem;
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  
  --shadow-sm: 0 1px 3px rgba(26,26,26,0.08);
  --shadow-md: 0 4px 20px rgba(26,26,26,0.1);
  --shadow-lg: 0 8px 40px rgba(26,26,26,0.12);
  --shadow-xl: 0 16px 60px rgba(26,26,26,0.15);
  
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-cream-light);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

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

ul {
  list-style: none;
}

/* --- Container --- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

/* --- Section Tags --- */
.section-tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-coral);
  margin-bottom: var(--space-sm);
}

.section-title {
  font-size: clamp(2rem, 5vw, 3.25rem);
  color: var(--color-charcoal);
  margin-bottom: var(--space-md);
}

.section-title--light {
  color: var(--color-white);
}

.section-title-accent {
  color: var(--color-coral);
}

.section-title-accent-light {
  color: var(--color-coral);
  font-style: italic;
}

.section-desc,
.about__text,
.why-us__desc,
.contact__text {
  font-size: 1.1rem;
  color: var(--color-text-light);
  line-height: 1.7;
  max-width: 560px;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-coral);
  color: var(--color-white);
  box-shadow: 0 4px 15px rgba(232, 100, 90, 0.35);
}

.btn--primary:hover {
  background: var(--color-coral-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(232, 100, 90, 0.45);
}

.btn--ghost {
  background: rgba(255,255,255,0.12);
  color: var(--color-white);
  border: 1px solid rgba(255,255,255,0.3);
  backdrop-filter: blur(10px);
}

.btn--ghost:hover {
  background: rgba(255,255,255,0.2);
  border-color: rgba(255,255,255,0.5);
  transform: translateY(-2px);
}

.btn--coral {
  background: var(--color-coral);
  color: var(--color-white);
}

.btn--coral:hover {
  background: var(--color-coral-dark);
  transform: translateY(-2px);
}

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

.btn--full {
  width: 100%;
  justify-content: center;
  padding: 1rem 1.5rem;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-md) 0;
  transition: all var(--transition-base);
}

.nav.scrolled {
  background: rgba(26, 26, 26, 0.95);
  backdrop-filter: blur(20px);
  padding: var(--space-sm) 0;
  box-shadow: 0 2px 20px rgba(0,0,0,0.2);
}

.nav__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  color: var(--color-white);
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
}

.nav__logo-icon {
  color: var(--color-coral);
}

.nav__logo-accent {
  color: var(--color-coral);
  font-weight: 400;
  font-style: italic;
}

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

.nav__link {
  font-size: 0.875rem;
  font-weight: 500;
  color: rgba(255,255,255,0.75);
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-coral);
  transition: width var(--transition-base);
}

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

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

.nav__cta {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-coral);
  border: 1px solid var(--color-coral);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.nav__cta:hover {
  background: var(--color-coral);
  color: var(--color-white);
}

/* Mobile Toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  z-index: 1001;
}

.nav__toggle-bar {
  width: 24px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.nav__toggle.active .nav__toggle-bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav__toggle.active .nav__toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav__toggle.active .nav__toggle-bar:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  inset: 0;
  background: rgba(26, 26, 26, 0.98);
  backdrop-filter: blur(20px);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.mobile-menu.active {
  opacity: 1;
  pointer-events: all;
}

.mobile-menu__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.mobile-menu__link {
  font-family: var(--font-serif);
  font-size: 2rem;
  color: var(--color-white);
  font-weight: 700;
  transition: color var(--transition-fast);
}

.mobile-menu__link:hover {
  color: var(--color-coral);
}

.mobile-menu__cta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-coral);
  margin-top: var(--space-md);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

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

.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(26, 26, 26, 0.88) 0%,
    rgba(26, 26, 26, 0.7) 50%,
    rgba(26, 26, 26, 0.5) 100%
  );
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  padding-top: 5rem;
  width: 100%;
}

.hero__tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: rgba(255,255,255,0.7);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-lg);
  text-transform: uppercase;
}

.hero__tag svg {
  color: var(--color-coral);
}

.hero__headline {
  font-size: clamp(2.75rem, 7vw, 5.5rem);
  color: var(--color-white);
  font-weight: 900;
  line-height: 1.05;
  margin-bottom: var(--space-lg);
  max-width: 800px;
}

.hero__accent {
  color: var(--color-coral);
  font-style: italic;
  font-weight: 700;
}

.hero__sub {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: rgba(255,255,255,0.75);
  max-width: 540px;
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
}

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

.hero__scroll {
  position: absolute;
  bottom: var(--space-2xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  z-index: 1;
}

.hero__scroll span {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
}

.hero__scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, rgba(255,255,255,0.4), transparent);
  animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
  0%, 100% { opacity: 1; transform: scaleY(1); }
  50% { opacity: 0.5; transform: scaleY(0.6); }
}

/* --- Services Section --- */
.services {
  padding: var(--space-4xl) 0;
  background: var(--color-cream-light);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-header .section-desc {
  margin: 0 auto;
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.service-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all var(--transition-base);
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-coral);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-border);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-card__icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(232, 100, 90, 0.08);
  border-radius: var(--radius-md);
  color: var(--color-coral);
  margin-bottom: var(--space-md);
  transition: all var(--transition-base);
}

.service-card:hover .service-card__icon {
  background: var(--color-coral);
  color: var(--color-white);
}

.service-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
  color: var(--color-charcoal);
}

.service-card__desc {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.65;
}

/* --- About Section --- */
.about {
  padding: var(--space-4xl) 0;
  background: var(--color-cream);
}

.about__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.about__image {
  position: relative;
}

.about__image-wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.about__image-wrapper img {
  width: 100%;
  height: 500px;
  object-fit: cover;
}

.about__image-accent {
  position: absolute;
  bottom: -20px;
  right: -20px;
  width: 120px;
  height: 120px;
  background: var(--color-coral);
  border-radius: var(--radius-lg);
  z-index: -1;
}

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

.about__text {
  margin-bottom: var(--space-md);
}

.about__values {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

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

.about__value-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(232, 100, 90, 0.08);
  border-radius: var(--radius-md);
  color: var(--color-coral);
}

.about__value strong {
  display: block;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-charcoal);
  margin-bottom: 0.125rem;
}

.about__value-desc {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

/* --- Why Us Section --- */
.why-us {
  padding: var(--space-4xl) 0;
  background: var(--color-charcoal);
  position: relative;
  overflow: hidden;
}

.why-us::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(232,100,90,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.why-us__inner {
  position: relative;
  z-index: 1;
}

.why-us__content {
  margin-bottom: var(--space-3xl);
}

.why-us__content .section-desc {
  color: rgba(255,255,255,0.6);
}

.why-us__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.why-card {
  background: var(--color-charcoal-light);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  border: 1px solid rgba(255,255,255,0.06);
  transition: all var(--transition-base);
}

.why-card:hover {
  border-color: rgba(232, 100, 90, 0.3);
  transform: translateY(-2px);
}

.why-card__number {
  display: block;
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 900;
  color: rgba(232, 100, 90, 0.2);
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.why-card__title {
  font-size: 1.25rem;
  color: var(--color-white);
  margin-bottom: var(--space-xs);
}

.why-card__desc {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.65;
}

/* --- Contact Section --- */
.contact {
  padding: var(--space-4xl) 0;
  background: var(--color-charcoal);
  position: relative;
}

.contact::before {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(232,100,90,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.contact__layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.contact__info {
  padding-top: var(--space-lg);
}

.contact__text {
  color: rgba(255,255,255,0.6);
  margin-bottom: var(--space-2xl);
  max-width: 440px;
}

.contact__details {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

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

.contact__detail-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(232, 100, 90, 0.1);
  border-radius: var(--radius-md);
  color: var(--color-coral);
}

.contact__detail strong {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 0.25rem;
}

.contact__detail span,
.contact__detail a {
  font-size: 1rem;
  color: var(--color-white);
  transition: color var(--transition-fast);
}

.contact__detail a:hover {
  color: var(--color-coral);
}

.contact__form-wrapper {
  width: 100%;
}

.contact__form-card {
  background: var(--color-charcoal-light);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  border: 1px solid rgba(255,255,255,0.06);
}

.contact__form-title {
  font-size: 1.5rem;
  color: var(--color-white);
  margin-bottom: var(--space-xs);
}

.contact__form-sub {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.5);
  margin-bottom: var(--space-xl);
}

.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 0.5rem;
}

.form-input {
  width: 100%;
  padding: 0.875rem 1rem;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  color: var(--color-white);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  outline: none;
}

.form-input::placeholder {
  color: rgba(255,255,255,0.25);
}

.form-input:focus {
  border-color: var(--color-coral);
  background: rgba(232, 100, 90, 0.05);
  box-shadow: 0 0 0 3px rgba(232, 100, 90, 0.1);
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='rgba(255,255,255,0.4)' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
  cursor: pointer;
}

.form-select option {
  background: var(--color-charcoal-light);
  color: var(--color-white);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-success {
  display: none;
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
}

.form-success.active {
  display: block;
}

.form-success__icon {
  color: var(--color-coral);
  margin-bottom: var(--space-md);
}

.form-success__title {
  font-size: 1.5rem;
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.form-success__text {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.5);
}

/* --- Footer --- */
.footer {
  background: #111111;
  padding: var(--space-3xl) 0 var(--space-lg);
}

.footer__top {
  display: grid;
  grid-template-columns: 2fr 1fr 1.5fr;
  gap: var(--space-3xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.footer__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.footer__logo-icon {
  color: var(--color-coral);
}

.footer__logo-accent {
  color: var(--color-coral);
  font-weight: 400;
  font-style: italic;
}

.footer__tagline {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.4);
  max-width: 280px;
  line-height: 1.6;
}

.footer__heading {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: var(--space-md);
}

.footer__links ul {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer__links a {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition-fast);
}

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

.footer__contact p {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.5);
  line-height: 1.7;
}

.footer__contact a {
  color: rgba(255,255,255,0.6);
  transition: color var(--transition-fast);
}

.footer__contact a:hover {
  color: var(--color-coral);
}

.footer__bottom {
  padding-top: var(--space-lg);
  text-align: center;
}

.footer__bottom p {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.25);
}

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

.reveal.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; }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .services__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .about__layout {
    gap: var(--space-2xl);
  }
}

@media (max-width: 768px) {
  .nav__links {
    display: none;
  }
  
  .nav__toggle {
    display: flex;
  }
  
  .hero__headline {
    font-size: clamp(2.25rem, 10vw, 3.5rem);
  }
  
  .hero__actions {
    flex-direction: column;
  }
  
  .hero__actions .btn {
    justify-content: center;
  }
  
  .hero__scroll {
    display: none;
  }
  
  .services__grid {
    grid-template-columns: 1fr;
  }
  
  .about__layout {
    grid-template-columns: 1fr;
  }
  
  .about__image {
    order: -1;
  }
  
  .about__image-wrapper img {
    height: 350px;
  }
  
  .about__image-accent {
    width: 80px;
    height: 80px;
    bottom: -12px;
    right: -12px;
  }
  
  .why-us__grid {
    grid-template-columns: 1fr;
  }
  
  .contact__layout {
    grid-template-columns: 1fr;
  }
  
  .footer__top {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }
  
  .services,
  .about,
  .why-us,
  .contact {
    padding: var(--space-3xl) 0;
  }
  
  .service-card {
    padding: var(--space-xl);
  }
  
  .contact__form-card {
    padding: var(--space-lg);
  }
}