/* ==========================================================================
   Riel Innovations — Premium Agency Design System
   Neutral luxury palette, bold typography, grid layout
   ========================================================================== */

/* ---------------------------------------------------------------------------
   Design tokens
   --------------------------------------------------------------------------- */
:root {
  /* Palette */
  --color-charcoal: #1c1c1e;
  --color-charcoal-light: #2c2c2e;
  --color-white: #ffffff;
  --color-off-white: #fafafa;
  --color-gray-muted: #6b7280;
  --color-gray-light: #9ca3af;
  --color-gray-border: #e5e7eb;
  --color-accent: #0d9488;
  --color-accent-hover: #0f766e;
  --color-accent-subtle: rgba(13, 148, 136, 0.08);

  /* Typography */
  --font-heading: "DM Serif Display", Georgia, serif;
  --font-body: "Source Sans 3", "Inter", system-ui, sans-serif;

  --text-heading-xl: clamp(2.5rem, 5vw, 4rem);
  --text-heading-lg: clamp(1.75rem, 3vw, 2.5rem);
  --text-heading-md: clamp(1.25rem, 2vw, 1.5rem);
  --text-body: 1.0625rem;
  --text-body-sm: 0.9375rem;
  --line-height-tight: 1.2;
  --line-height-body: 1.65;
  --letter-spacing-tight: -0.02em;

  /* Spacing & layout */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --container-max: 1200px;
  --container-padding: clamp(1rem, 5vw, 2rem);

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --transition-fast: 200ms var(--ease-out);
  --transition-base: 300ms var(--ease-out);
  --transition-slow: 400ms var(--ease-out);
}

/* ---------------------------------------------------------------------------
   Reset & base
   --------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: var(--line-height-body);
  color: var(--color-charcoal);
  background-color: var(--color-off-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 var(--transition-fast), opacity var(--transition-fast);
}

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

/* ---------------------------------------------------------------------------
   Typography
   --------------------------------------------------------------------------- */
.heading-xl {
  font-family: var(--font-heading);
  font-size: var(--text-heading-xl);
  font-weight: 400;
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-charcoal);
}

.heading-lg {
  font-family: var(--font-heading);
  font-size: var(--text-heading-lg);
  font-weight: 400;
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-charcoal);
}

.heading-md {
  font-family: var(--font-body);
  font-size: var(--text-heading-md);
  font-weight: 700;
  line-height: var(--line-height-tight);
  color: var(--color-charcoal);
}

.body-lg {
  font-size: 1.125rem;
  color: var(--color-gray-muted);
}

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

.section {
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-3xl);
}

.section--dark {
  background-color: var(--color-charcoal);
  color: var(--color-white);
}

.section--dark .heading-lg,
.section--dark .heading-md {
  color: var(--color-white);
}

.section--dark .body-lg,
.section--dark p {
  color: var(--color-gray-light);
}

/* ---------------------------------------------------------------------------
   Buttons
   --------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color var(--transition-base), transform var(--transition-fast), box-shadow var(--transition-base);
}

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

.btn--primary:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(13, 148, 136, 0.25);
}

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

.btn--outline:hover {
  background-color: var(--color-charcoal);
  color: var(--color-white);
}

.section--dark .btn--outline {
  color: var(--color-white);
  border-color: var(--color-white);
}

.section--dark .btn--outline:hover {
  background-color: var(--color-white);
  color: var(--color-charcoal);
}

/* ---------------------------------------------------------------------------
   Header
   --------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-gray-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.site-logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--color-charcoal);
  letter-spacing: var(--letter-spacing-tight);
}

.site-logo:hover {
  color: var(--color-charcoal);
  opacity: 0.85;
}

.nav {
  display: none;
}

@media (min-width: 768px) {
  .nav {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
  }
}

.nav a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-gray-muted);
}

.nav a:hover {
  color: var(--color-charcoal);
}

.nav .btn {
  padding: 0.5rem 1.25rem;
  font-size: 0.9375rem;
}

.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-charcoal);
}

@media (min-width: 768px) {
  .menu-toggle {
    display: none;
  }
}

.mobile-nav {
  display: none;
  padding: var(--space-md);
  background-color: var(--color-white);
  border-top: 1px solid var(--color-gray-border);
}

.mobile-nav.is-open {
  display: block;
}

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

.mobile-nav a {
  display: block;
  padding: var(--space-sm);
  font-weight: 500;
  color: var(--color-charcoal);
  border-radius: 4px;
}

.mobile-nav a:hover {
  background-color: var(--color-accent-subtle);
  color: var(--color-accent);
}

/* ---------------------------------------------------------------------------
   Hero
   --------------------------------------------------------------------------- */
.hero {
  min-height: 85vh;
  display: flex;
  align-items: center;
  background-color: var(--color-charcoal);
  color: var(--color-white);
  position: relative;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  opacity: 0.04;
  background-image: radial-gradient(circle at 20% 50%, var(--color-accent) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, var(--color-accent) 0%, transparent 40%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
  text-align: center;
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-2xl);
}

.hero__headline {
  font-family: var(--font-heading);
  font-size: var(--text-heading-xl);
  font-weight: 400;
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
  margin: 0 0 var(--space-md);
  max-width: 16ch;
  margin-left: auto;
  margin-right: auto;
}

.hero__subheadline {
  font-size: 1.25rem;
  color: var(--color-gray-light);
  max-width: 42ch;
  margin: 0 auto var(--space-xl);
  line-height: var(--line-height-body);
}

.hero__cta {
  margin-top: var(--space-lg);
}

/* ---------------------------------------------------------------------------
   What We Do (services grid)
   --------------------------------------------------------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 640px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

.service-card {
  padding: var(--space-lg);
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-border);
  border-radius: 4px;
  transition: border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
}

.service-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
  transform: translateY(-4px);
}

.service-card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-md);
  color: var(--color-accent);
}

.service-card__title {
  margin: 0 0 var(--space-xs);
}

.service-card__text {
  margin: 0;
  font-size: var(--text-body-sm);
  color: var(--color-gray-muted);
  line-height: var(--line-height-body);
}

/* ---------------------------------------------------------------------------
   Why Choose Us
   --------------------------------------------------------------------------- */
.why-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 640px) {
  .why-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .why-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

.why-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-sm);
}

.why-item__icon {
  width: 40px;
  height: 40px;
  color: var(--color-accent);
}

.why-item__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-charcoal);
}

.why-item__text {
  margin: 0;
  font-size: var(--text-body-sm);
  color: var(--color-gray-muted);
  line-height: var(--line-height-body);
}

/* ---------------------------------------------------------------------------
   Our Process
   --------------------------------------------------------------------------- */
.process {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
  counter-reset: step;
}

.process__step {
  flex: 1 1 140px;
  max-width: 200px;
  text-align: center;
  counter-increment: step;
}

.process__step::before {
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-sm);
  font-family: var(--font-body);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
  background-color: var(--color-accent-subtle);
  border-radius: 50%;
}

.process__step h3 {
  margin: 0 0 var(--space-xs);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-charcoal);
}

.process__step p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-gray-muted);
  line-height: var(--line-height-body);
}

/* ---------------------------------------------------------------------------
   Portfolio / Case highlights
   --------------------------------------------------------------------------- */
.portfolio-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 768px) {
  .portfolio-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.portfolio-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-border);
  border-radius: 4px;
  overflow: hidden;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.portfolio-card:hover {
  border-color: var(--color-gray-light);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.portfolio-card__link {
  display: block;
  color: inherit;
}

.portfolio-card__link:hover {
  color: inherit;
}

.portfolio-card__image {
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background-color: var(--color-gray-border);
}

.portfolio-card__content {
  padding: var(--space-lg);
}

.portfolio-card__title {
  margin: 0 0 var(--space-xs);
  font-size: 1.125rem;
  font-weight: 600;
}

.portfolio-card__meta {
  font-size: var(--text-body-sm);
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.portfolio-card__result {
  font-size: var(--text-body-sm);
  color: var(--color-gray-muted);
  margin: 0;
  line-height: var(--line-height-body);
}

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

@media (min-width: 768px) {
  .testimonials-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.testimonial {
  padding: var(--space-xl);
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-border);
  border-radius: 4px;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.testimonial:hover {
  border-color: var(--color-gray-light);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.04);
}

.testimonial__quote {
  font-size: 1rem;
  color: var(--color-charcoal);
  line-height: var(--line-height-body);
  margin: 0 0 var(--space-lg);
}

.testimonial__quote::before {
  content: '"';
}

.testimonial__quote::after {
  content: '"';
}

.testimonial__author {
  font-weight: 600;
  color: var(--color-charcoal);
  margin: 0 0 2px;
}

.testimonial__role {
  font-size: var(--text-body-sm);
  color: var(--color-gray-muted);
  margin: 0;
}

/* ---------------------------------------------------------------------------
   CTA block
   --------------------------------------------------------------------------- */
.cta-block {
  text-align: center;
  padding: var(--space-3xl) var(--container-padding);
  background-color: var(--color-charcoal);
  color: var(--color-white);
}

.cta-block__headline {
  font-family: var(--font-heading);
  font-size: var(--text-heading-lg);
  font-weight: 400;
  margin: 0 0 var(--space-md);
  color: var(--color-white);
}

.cta-block__text {
  font-size: 1.125rem;
  color: var(--color-gray-light);
  max-width: 42ch;
  margin: 0 auto var(--space-xl);
}

.cta-block .btn--primary {
  background-color: var(--color-white);
  color: var(--color-charcoal);
}

.cta-block .btn--primary:hover {
  background-color: var(--color-gray-light);
  color: var(--color-charcoal);
}

/* ---------------------------------------------------------------------------
   Contact form
   --------------------------------------------------------------------------- */
.contact-form-wrap {
  max-width: 560px;
  margin: 0 auto;
  padding: var(--space-xl);
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-border);
  border-radius: 4px;
}

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

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-charcoal);
  margin-bottom: var(--space-xs);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-charcoal);
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-border);
  border-radius: 4px;
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

.form-feedback {
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  border-radius: 4px;
  display: none;
}

.form-feedback.is-visible {
  display: block;
}

.form-feedback--success {
  background-color: var(--color-accent-subtle);
  color: var(--color-accent-hover);
}

.form-feedback--error {
  background-color: rgba(220, 38, 38, 0.08);
  color: #b91c1c;
}

.form-submit {
  width: 100%;
  margin-top: var(--space-sm);
}

/* ---------------------------------------------------------------------------
   Footer
   --------------------------------------------------------------------------- */
.site-footer {
  padding: var(--space-xl) var(--container-padding);
  background-color: var(--color-charcoal);
  color: var(--color-gray-light);
}

.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  align-items: center;
  text-align: center;
}

@media (min-width: 640px) {
  .site-footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.site-footer__brand {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-white);
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
}

.site-footer__links a {
  color: var(--color-gray-light);
  font-size: 0.9375rem;
}

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

.site-footer__copy {
  font-size: 0.875rem;
  color: var(--color-gray-muted);
  margin: 0;
}

/* ---------------------------------------------------------------------------
   Section headings (shared)
   --------------------------------------------------------------------------- */
.section-head {
  text-align: center;
  margin-bottom: var(--space-2xl);
  max-width: 40ch;
  margin-left: auto;
  margin-right: auto;
}

.section-head__title {
  margin: 0 0 var(--space-sm);
}

.section-head__subtitle {
  margin: 0;
  font-size: 1.125rem;
  color: var(--color-gray-muted);
  line-height: var(--line-height-body);
}

.section--dark .section-head__subtitle {
  color: var(--color-gray-light);
}

/* ---------------------------------------------------------------------------
   Scroll reveal (optional, used by animations.js)
   --------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

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