/* =========================================================
   DIEHL — Core Stylesheet
   Design tokens, resets, typography, layout and base
   component styles shared across every page.
   ========================================================= */

/* ---- Design Tokens -------------------------------------- */
:root {
  /* Color palette */
  --color-black: #0d0f12;
  --color-charcoal: #16191d;
  --color-charcoal-soft: #1f2328;
  --color-gray-900: #2b2f36;
  --color-gray-700: #545a63;
  --color-gray-500: #7c828b;
  --color-gray-300: #c3c7cc;
  --color-gray-100: #eef0f2;
  --color-white: #ffffff;
  --color-blue: #1c5cff;
  --color-blue-dark: #123f9c;

  --color-bg: var(--color-white);
  --color-bg-alt: var(--color-gray-100);
  --color-bg-dark: var(--color-charcoal);
  --color-text: var(--color-charcoal);
  --color-text-muted: var(--color-gray-700);
  --color-text-inverse: var(--color-white);
  --color-border: #dfe2e6;
  --color-accent: var(--color-blue);

  /* Typography */
  --font-base: "Inter", "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  --fs-hero: clamp(2.5rem, 6vw, 5rem);
  --fs-h1: clamp(2rem, 4vw, 3.25rem);
  --fs-h2: clamp(1.6rem, 3vw, 2.5rem);
  --fs-h3: clamp(1.25rem, 2vw, 1.65rem);
  --fs-body: 1rem;
  --fs-small: 0.875rem;
  --lh-tight: 1.15;
  --lh-normal: 1.6;

  /* Layout */
  --max-width: 1280px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --section-space: clamp(4rem, 8vw, 7rem);
  --radius: 4px;
  --header-height: 84px;

  /* Motion */
  --transition-fast: 160ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 600ms ease;
}

/* ---- Reset ------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-base);
  font-size: var(--fs-body);
  line-height: var(--lh-normal);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
ul, ol { list-style: none; margin: 0; padding: 0; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
h1, h2, h3, h4, p { margin: 0; }
input, textarea, select { font-family: inherit; font-size: inherit; }

@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;
    scroll-behavior: auto !important;
  }
}

/* ---- Accessibility ---------------------------------------- */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-black);
  color: var(--color-white);
  padding: 0.75rem 1.25rem;
  z-index: 1000;
  border-radius: 0 0 var(--radius) 0;
}
.skip-link:focus {
  left: 0;
}
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ---- Layout utilities --------------------------------------- */
.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section {
  padding-block: var(--section-space);
}
.section--alt { background: var(--color-bg-alt); }
.section--dark {
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
}
.section--dark .section-eyebrow,
.section--dark .section-description { color: var(--color-gray-300); }

.section-head {
  max-width: 760px;
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
}
.section-eyebrow {
  display: block;
  font-size: var(--fs-small);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 0.75rem;
}
.section-title {
  font-size: var(--fs-h2);
  line-height: var(--lh-tight);
  font-weight: 700;
  letter-spacing: -0.01em;
}
.section-description {
  margin-top: 1rem;
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 60ch;
}

.grid {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--6 { grid-template-columns: repeat(6, 1fr); }

/* ---- Buttons ------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--color-black);
  color: var(--color-white);
}
.btn-primary:hover { background: var(--color-accent); }
.btn-secondary {
  background: transparent;
  color: var(--color-black);
  border-color: var(--color-black);
}
.btn-secondary:hover {
  background: var(--color-black);
  color: var(--color-white);
}
.section--dark .btn-secondary {
  color: var(--color-white);
  border-color: var(--color-white);
}
.section--dark .btn-secondary:hover {
  background: var(--color-white);
  color: var(--color-black);
}
.btn-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
  font-size: var(--fs-small);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-black);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: border-color var(--transition-fast), gap var(--transition-fast);
}
.btn-link:hover { border-color: currentColor; gap: 0.65rem; }
.btn-link .arrow { transition: transform var(--transition-fast); }
.btn-link:hover .arrow { transform: translateX(3px); }

/* ---- Header / Navigation ------------------------------------ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 500;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-fast);
}
.site-header.is-scrolled {
  box-shadow: 0 4px 20px rgba(13, 15, 18, 0.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}
.logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 0.06em;
}
.logo-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.logo-mark::before {
  content: "";
  width: 10px;
  height: 10px;
  background: var(--color-accent);
  display: inline-block;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2vw, 2rem);
}
.main-nav a {
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: 0.02em;
  padding-block: 0.5rem;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}
.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  transition: background var(--transition-fast);
}
.icon-btn:hover { background: var(--color-gray-100); }

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  position: relative;
}
.nav-toggle span {
  position: absolute;
  left: 8px; right: 8px;
  height: 2px;
  background: var(--color-black);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}
.nav-toggle span:nth-child(1) { top: 14px; }
.nav-toggle span:nth-child(2) { top: 20px; }
.nav-toggle span:nth-child(3) { top: 26px; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---- Hero ----------------------------------------------------- */
.hero {
  position: relative;
  min-height: 84vh;
  display: flex;
  align-items: flex-end;
  color: var(--color-white);
  overflow: hidden;
}
.hero-media {
  position: absolute;
  inset: 0;
  z-index: -1;
}
.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(13,15,18,0.35) 0%, rgba(13,15,18,0.75) 100%);
}
.hero-content {
  padding-block: clamp(3rem, 8vw, 5rem);
  max-width: 820px;
}
.hero-eyebrow {
  font-size: var(--fs-small);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-gray-300);
  margin-bottom: 1rem;
  display: block;
}
.hero-title {
  font-size: var(--fs-hero);
  line-height: var(--lh-tight);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 1.25rem;
}
.hero-subtitle {
  font-size: 1.15rem;
  max-width: 56ch;
  color: var(--color-gray-100);
  margin-bottom: 2rem;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Page header for interior pages (no full hero image) */
.page-header {
  padding-block: clamp(3rem, 7vw, 5rem);
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
}
.page-header-eyebrow {
  font-size: var(--fs-small);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-gray-300);
  margin-bottom: 0.75rem;
  display: block;
}
.page-header-title {
  font-size: var(--fs-h1);
  line-height: var(--lh-tight);
  font-weight: 800;
  max-width: 900px;
}
.page-header-lead {
  margin-top: 1rem;
  font-size: 1.1rem;
  color: var(--color-gray-300);
  max-width: 65ch;
}

/* ---- Footer ---------------------------------------------------- */
.site-footer {
  background: var(--color-black);
  color: var(--color-gray-300);
  padding-block: clamp(3rem, 6vw, 4.5rem) 2rem;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 2rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--color-gray-900);
}
.footer-brand .logo { color: var(--color-white); }
.footer-brand p {
  margin-top: 0.75rem;
  color: var(--color-gray-500);
  max-width: 32ch;
}
.footer-heading {
  font-size: var(--fs-small);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-gray-500);
  margin-bottom: 1rem;
}
.footer-links li { margin-bottom: 0.6rem; }
.footer-links a { transition: color var(--transition-fast); }
.footer-links a:hover { color: var(--color-white); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 1.5rem;
  font-size: var(--fs-small);
  color: var(--color-gray-500);
}

/* ---- Fade-in animation hook ------------------------------------- */
[data-animate] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}
[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  [data-animate] { opacity: 1; transform: none; transition: none; }
}