/* ================================================================
   S&D CONSULTING — styles.css
   Design system: charcoal/black base, warm off-white text,
   muted gold (#b8924a) + deep persimmon (#bf5130) accents.
   Fonts: Cormorant Garamond (headings) + Inter (body)
================================================================ */

/* ----------------------------------------------------------------
   1. CUSTOM PROPERTIES
---------------------------------------------------------------- */
:root {
  /* Colors */
  --color-bg:         #111110;
  --color-bg-alt:     #181816;
  --color-bg-card:    #1c1c1a;
  --color-bg-card-hover: #222220;
  --color-border:     rgba(255, 255, 255, 0.07);
  --color-border-strong: rgba(255, 255, 255, 0.12);

  --color-text:       #f0ede6;
  --color-text-muted: #a09c94;
  --color-text-faint: #6b6760;

  --color-gold:       #b8924a;
  --color-gold-light: #d4ab68;
  --color-gold-dim:   rgba(184, 146, 74, 0.15);

  --color-persimmon:  #bf5130;
  --color-persimmon-light: #d4643e;
  --color-persimmon-dim: rgba(191, 81, 48, 0.12);

  /* Typography */
  --font-serif:  'Cormorant Garamond', Georgia, serif;
  --font-sans:   'Inter', system-ui, -apple-system, sans-serif;

  /* Spacing scale (8px base) */
  --sp-1:  0.5rem;   /*  8px */
  --sp-2:  1rem;     /* 16px */
  --sp-3:  1.5rem;   /* 24px */
  --sp-4:  2rem;     /* 32px */
  --sp-5:  3rem;     /* 48px */
  --sp-6:  4rem;     /* 64px */
  --sp-7:  6rem;     /* 96px */
  --sp-8:  8rem;     /* 128px */

  /* Layout */
  --container-max: 1160px;
  --container-pad: clamp(1.25rem, 5vw, 3rem);

  /* Transitions */
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
  --trans-fast:   150ms var(--ease);
  --trans-base:   250ms var(--ease);
  --trans-slow:   400ms var(--ease);

  /* Borders */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  16px;
}

/* ----------------------------------------------------------------
   2. RESET & BASE
---------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Remove list styles while keeping accessibility semantics */
ul[role="list"] {
  list-style: none;
}

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

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

/* Focus styles for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ----------------------------------------------------------------
   3. LAYOUT UTILITIES
---------------------------------------------------------------- */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section {
  padding-block: clamp(4rem, 10vw, 7rem);
}

/* ----------------------------------------------------------------
   4. TYPOGRAPHY
---------------------------------------------------------------- */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(2.8rem, 6vw, 5rem);
  font-weight: 300;
}

h2 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 300;
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.6rem);
  font-weight: 400;
}

h4 {
  font-size: 1.1rem;
  font-weight: 500;
  font-family: var(--font-sans);
  letter-spacing: 0.01em;
}

em {
  font-style: italic;
  color: var(--color-gold-light);
}

p {
  max-width: 66ch;
  color: var(--color-text-muted);
}

.section-label {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: var(--sp-2);
}

.section-header {
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.section-header h2 {
  margin-top: var(--sp-1);
  margin-bottom: var(--sp-2);
}

.section-intro {
  font-size: 1.05rem;
  max-width: 54ch;
}

/* ----------------------------------------------------------------
   5. BUTTONS
---------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition:
    background-color var(--trans-base),
    color var(--trans-base),
    border-color var(--trans-base),
    transform var(--trans-fast),
    box-shadow var(--trans-base);
  cursor: pointer;
  white-space: nowrap;
}

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

.btn-primary {
  background-color: var(--color-gold);
  color: var(--color-bg);
  border: 1px solid var(--color-gold);
}

.btn-primary:hover {
  background-color: var(--color-gold-light);
  border-color: var(--color-gold-light);
  box-shadow: 0 0 28px rgba(184, 146, 74, 0.25);
}

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

.btn-secondary:hover {
  border-color: var(--color-gold);
  color: var(--color-gold-light);
}

/* ----------------------------------------------------------------
   6. NAVIGATION
---------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding-block: 1.25rem;
  transition: background-color var(--trans-slow), backdrop-filter var(--trans-slow);
}

.site-header.scrolled {
  background-color: rgba(17, 17, 16, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--color-text);
  flex-shrink: 0;
  transition: color var(--trans-fast);
}

.nav-logo:hover {
  color: var(--color-gold-light);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.82rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: color var(--trans-fast), background-color var(--trans-fast);
}

.nav-links a:hover {
  color: var(--color-text);
  background-color: rgba(255, 255, 255, 0.05);
}

.nav-links .nav-cta {
  color: var(--color-gold);
  border: 1px solid rgba(184, 146, 74, 0.35);
  margin-left: var(--sp-1);
}

.nav-links .nav-cta:hover {
  background-color: var(--color-gold-dim);
  color: var(--color-gold-light);
}

/* Mobile hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.4rem;
  border-radius: var(--radius-sm);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background-color: var(--color-text);
  transition: transform var(--trans-base), opacity var(--trans-base);
  transform-origin: center;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ----------------------------------------------------------------
   7. HERO
---------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;

  /* Background image — replace hero-bg.png when ready */
  background-image: url('hero-bg.png');
  background-size: cover;
  background-position: center 30%;
  background-repeat: no-repeat;
}

/* Dark overlay so text reads cleanly */
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    160deg,
    rgba(17, 17, 16, 0.82) 0%,
    rgba(17, 17, 16, 0.65) 50%,
    rgba(17, 17, 16, 0.78) 100%
  );
  z-index: 1;
}

/* Particle canvas sits above overlay */
.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 3;
  padding-top: 8rem;
  padding-bottom: 5rem;
}

.hero-eyebrow {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: var(--sp-2);
  max-width: none;
}

.hero-headline {
  color: var(--color-text);
  max-width: 16ch;
  margin-bottom: var(--sp-3);
}

.hero-sub {
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  line-height: 1.75;
  max-width: 54ch;
  color: rgba(240, 237, 230, 0.75);
  margin-bottom: var(--sp-4);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
}

/* ----------------------------------------------------------------
   8. ABOUT
---------------------------------------------------------------- */
.about {
  background-color: var(--color-bg-alt);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(3rem, 6vw, 6rem);
  align-items: center;
}

.about-image {
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 4 / 5;
}

.about-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.85) saturate(0.9);
  transition: filter var(--trans-slow);
}

.about-image:hover img {
  filter: brightness(0.9) saturate(1);
}

.about-text .section-label {
  display: block;
}

.about-text h2 {
  margin-top: var(--sp-1);
  margin-bottom: var(--sp-3);
}

.about-text p + p {
  margin-top: var(--sp-2);
}

/* ----------------------------------------------------------------
   9. SERVICES
---------------------------------------------------------------- */
.services {
  background-color: var(--color-bg);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: 1px;
  background-color: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.service-card {
  background-color: var(--color-bg-card);
  padding: clamp(1.75rem, 3vw, 2.5rem);
  transition: background-color var(--trans-base);
}

.service-card:hover {
  background-color: var(--color-bg-card-hover);
}

/* Accent card for AI service */
.service-card--accent {
  background-color: rgba(191, 81, 48, 0.06);
  border-inline: 1px solid rgba(191, 81, 48, 0.15);
}

.service-card--accent:hover {
  background-color: rgba(191, 81, 48, 0.1);
}

.service-card--accent .service-icon {
  color: var(--color-persimmon-light);
}

.service-icon {
  color: var(--color-gold);
  margin-bottom: var(--sp-2);
}

.service-card h3 {
  font-size: clamp(1.1rem, 1.5vw, 1.35rem);
  margin-bottom: var(--sp-2);
  color: var(--color-text);
}

.service-card p {
  font-size: 0.9rem;
  line-height: 1.65;
}

/* ----------------------------------------------------------------
   10. RETAINER
---------------------------------------------------------------- */
.retainer {
  background-color: var(--color-bg-alt);
}

.retainer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(3rem, 6vw, 6rem);
  align-items: center;
}

.retainer-image {
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 3 / 4;
  order: 2; /* Image on right */
}

.retainer-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.8) saturate(0.85);
}

.retainer-text {
  order: 1;
}

.retainer-text h2 {
  margin-top: var(--sp-1);
  margin-bottom: var(--sp-3);
}

.retainer-text p + p {
  margin-top: var(--sp-2);
}

.retainer-list {
  list-style: none;
  margin-block: var(--sp-3);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.retainer-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.92rem;
  color: var(--color-text-muted);
}

.retainer-list li::before {
  content: '';
  display: inline-block;
  width: 5px;
  height: 5px;
  min-width: 5px;
  border-radius: 50%;
  background-color: var(--color-gold);
  margin-top: 0.6rem;
}

/* ----------------------------------------------------------------
   11. AI SECTION
---------------------------------------------------------------- */
.ai-section {
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

.ai-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(3rem, 6vw, 6rem);
  align-items: center;
  margin-bottom: clamp(3rem, 5vw, 4rem);
}

.ai-text h2 {
  margin-top: var(--sp-1);
  margin-bottom: var(--sp-3);
}

.ai-text p + p {
  margin-top: var(--sp-2);
}

.ai-image {
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.ai-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.75) saturate(0.7) hue-rotate(5deg);
}

.ai-examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: 1px;
  background-color: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--sp-4);
}

.ai-example {
  background-color: var(--color-bg-card);
  padding: 1.5rem 1.75rem;
  transition: background-color var(--trans-base);
}

.ai-example:hover {
  background-color: var(--color-bg-card-hover);
}

.ai-example h4 {
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.ai-example p {
  font-size: 0.875rem;
  line-height: 1.6;
}

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

/* ----------------------------------------------------------------
   12. WHY SECTION
---------------------------------------------------------------- */
.why {
  background-color: var(--color-bg-alt);
}

.why .section-header {
  text-align: center;
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.why-image-strip {
  width: 100%;
  height: clamp(180px, 25vw, 320px);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.why-image-strip img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 60%;
  filter: brightness(0.65) saturate(0.8);
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
  gap: 0;
}

.why-item {
  display: flex;
  gap: var(--sp-3);
  padding: clamp(1.5rem, 3vw, 2.25rem);
  border: 1px solid var(--color-border);
  margin: -1px 0 0 -1px; /* Collapse borders into grid lines */
  transition: background-color var(--trans-base);
}

.why-item:hover {
  background-color: rgba(255, 255, 255, 0.02);
}

.why-number {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--color-gold);
  opacity: 0.6;
  flex-shrink: 0;
  line-height: 1.5;
  min-width: 2rem;
}

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

.why-item p {
  font-size: 0.9rem;
  line-height: 1.65;
}

/* ----------------------------------------------------------------
   13. CONTACT
---------------------------------------------------------------- */
.contact {
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

.contact-inner {
  max-width: 660px;
  text-align: center;
  margin-inline: auto;
}

.contact-inner .section-label {
  display: block;
}

.contact-inner h2 {
  margin-top: var(--sp-1);
  margin-bottom: var(--sp-3);
}

.contact-sub {
  font-size: 1.05rem;
  line-height: 1.75;
  margin-inline: auto;
  margin-bottom: var(--sp-4);
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  justify-content: center;
  margin-bottom: var(--sp-3);
}

.contact-email {
  font-size: 0.88rem;
  color: var(--color-text-faint);
  max-width: none;
  margin-inline: auto;
}

.contact-email a {
  color: var(--color-gold);
  text-decoration: underline;
  text-decoration-color: transparent;
  transition: text-decoration-color var(--trans-fast), color var(--trans-fast);
}

.contact-email a:hover {
  text-decoration-color: var(--color-gold);
  color: var(--color-gold-light);
}

/* ----------------------------------------------------------------
   14. FOOTER
---------------------------------------------------------------- */
.site-footer {
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding-top: var(--sp-5);
  padding-bottom: var(--sp-4);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-4);
}

.footer-logo {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: 0.25rem;
  max-width: none;
}

.footer-tagline {
  font-size: 0.78rem;
  color: var(--color-text-faint);
  letter-spacing: 0.04em;
  max-width: none;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  justify-content: center;
}

.footer-nav a {
  font-size: 0.8rem;
  color: var(--color-text-faint);
  transition: color var(--trans-fast);
}

.footer-nav a:hover {
  color: var(--color-text-muted);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.25rem;
}

.footer-contact a {
  font-size: 0.82rem;
  color: var(--color-text-faint);
  transition: color var(--trans-fast);
}

.footer-contact a:hover {
  color: var(--color-gold);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--sp-2);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.75rem;
  color: var(--color-text-faint);
  max-width: none;
  margin-inline: auto;
}

/* ----------------------------------------------------------------
   15. RESPONSIVE — TABLET (≤ 900px)
---------------------------------------------------------------- */
@media (max-width: 900px) {
  .about-grid,
  .retainer-grid,
  .ai-inner {
    grid-template-columns: 1fr;
    gap: var(--sp-4);
  }

  .about-image {
    aspect-ratio: 16 / 9;
  }

  .retainer-image {
    order: -1;
    aspect-ratio: 16 / 9;
  }

  .ai-image {
    order: -1;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--sp-3);
  }

  .footer-contact {
    align-items: center;
  }
}

/* ----------------------------------------------------------------
   16. RESPONSIVE — MOBILE (≤ 640px)
---------------------------------------------------------------- */
@media (max-width: 640px) {
  /* Nav */
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(17, 17, 16, 0.97);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--sp-1);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 99;
  }

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

  .nav-links a {
    font-size: 1rem;
    padding: 0.65rem 1.25rem;
  }

  /* Hero */
  .hero-actions {
    flex-direction: column;
  }

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

  /* Services — single column */
  .services-grid {
    grid-template-columns: 1fr;
  }

  /* Why — single column */
  .why-grid {
    grid-template-columns: 1fr;
  }

  /* AI examples */
  .ai-examples-grid {
    grid-template-columns: 1fr;
  }

  /* Contact */
  .contact-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

/* ----------------------------------------------------------------
   17. REDUCED MOTION
---------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}