/**
 * KK13 Excavator Review — industrial editorial stylesheet
 * Mobile-first, system fonts, no external dependencies.
 */

/* -------------------------------------------------------------------------
   Design tokens
   ------------------------------------------------------------------------- */
:root {
  --charcoal: #1c1f24;
  --charcoal-deep: #121418;
  --off-white: #f3f1eb;
  --paper: #faf9f6;
  --muted: #6b7078;
  --muted-border: #c8cbcf;
  --line: #2a2e36;
  --amber: #d4a017;
  --amber-dark: #a67c0a;
  --danger: #b42318;
  --danger-bg: #fceceb;
  --success: #1f6b3a;
  --success-bg: #e8f5ec;
  --focus: #e8b923;
  --max: 72rem;
  --nav-h: 3.75rem;
  --font: "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-display: "Segoe UI Semibold", "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4.5rem;
  --radius: 2px;
  --shadow: 0 1px 0 rgba(0, 0, 0, 0.08);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@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;
  }
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--charcoal);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--amber-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

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

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--amber);
  color: var(--charcoal-deep);
  padding: var(--space-3) var(--space-4);
  z-index: 1000;
  font-weight: 700;
}

.skip-link:focus {
  left: var(--space-4);
  top: var(--space-4);
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.container--narrow {
  width: min(100% - 2rem, 44rem);
  margin-inline: auto;
}

/* -------------------------------------------------------------------------
   Affiliation banner & header / nav
   ------------------------------------------------------------------------- */
.affiliation-banner {
  background: var(--charcoal-deep);
  color: #d7d9dd;
  font-size: 0.8125rem;
  line-height: 1.45;
  border-bottom: 2px solid var(--amber);
}

.affiliation-banner p {
  margin: 0;
  padding: var(--space-2) 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--charcoal);
  color: var(--off-white);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}

.site-nav__inner {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--nav-h);
  gap: var(--space-4);
}

.site-nav__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--off-white);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.01em;
}

.site-nav__brand-mark {
  width: 0.75rem;
  height: 1.5rem;
  background: var(--amber);
  flex-shrink: 0;
}

.site-nav__toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: transparent;
  border: 1px solid var(--muted-border);
  color: var(--off-white);
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  font: inherit;
}

.site-nav__toggle-icon {
  width: 1.1rem;
  height: 0.85rem;
  border-top: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  position: relative;
}

.site-nav__toggle-icon::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  border-top: 2px solid currentColor;
  transform: translateY(-50%);
}

.site-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: none;
  flex-direction: column;
  gap: 0;
  position: absolute;
  left: 0;
  right: 0;
  top: calc(var(--nav-h) + 2.2rem);
  background: var(--charcoal-deep);
  border-bottom: 2px solid var(--amber);
  padding: var(--space-3) var(--space-4) var(--space-5);
}

.site-nav.is-open .site-nav__list,
.site-nav__list.is-open {
  display: flex;
}

.site-nav__list a {
  display: block;
  color: var(--off-white);
  text-decoration: none;
  padding: var(--space-3) var(--space-2);
  border-bottom: 1px solid var(--line);
}

.site-nav__list a:hover,
.site-nav__list a.is-current {
  color: var(--amber);
}

.site-nav__reply a {
  color: var(--amber) !important;
  font-weight: 700;
}

@media (min-width: 960px) {
  .site-nav__toggle {
    display: none;
  }

  .site-nav__inner {
    position: relative;
  }

  .site-nav__list {
    display: flex;
    flex-direction: row;
    align-items: center;
    position: static;
    background: transparent;
    border: 0;
    padding: 0;
    gap: 0.15rem;
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .site-nav__list a {
    border: 0;
    padding: var(--space-2) 0.45rem;
    font-size: 0.875rem;
  }

  .site-nav__brand-text {
    font-size: 0.95rem;
  }
}

/* -------------------------------------------------------------------------
   Typography & sections
   ------------------------------------------------------------------------- */
h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  line-height: 1.2;
  color: var(--charcoal-deep);
  font-weight: 700;
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-4);
}

h2 {
  font-size: clamp(1.35rem, 2.5vw, 1.85rem);
  margin: 0 0 var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 2px solid var(--amber);
  display: inline-block;
}

h3 {
  font-size: 1.15rem;
  margin: 0 0 var(--space-3);
}

p {
  margin: 0 0 var(--space-4);
}

.lede {
  font-size: 1.125rem;
  color: var(--charcoal);
  max-width: 42rem;
}

.source-label {
  font-size: 0.8125rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: var(--space-2) 0 0;
}

.media-caption {
  font-size: 0.875rem;
  color: var(--muted);
  margin: var(--space-2) 0 0;
  font-style: italic;
}

.section {
  padding: var(--space-7) 0;
}

.section--alt {
  background: var(--off-white);
}

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

.section--dark h2,
.section--dark h3 {
  color: var(--off-white);
}

.section--dark a {
  color: var(--amber);
}

.section-intro {
  max-width: 40rem;
  margin-bottom: var(--space-5);
}

/* -------------------------------------------------------------------------
   Hero
   ------------------------------------------------------------------------- */
.hero {
  background:
    linear-gradient(135deg, rgba(18, 20, 24, 0.92) 0%, rgba(28, 31, 36, 0.88) 55%, rgba(28, 31, 36, 0.75) 100%),
    var(--charcoal-deep);
  color: var(--off-white);
  padding: var(--space-7) 0 var(--space-8);
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 4px;
  background: var(--amber);
}

.hero__eyebrow {
  display: inline-block;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber);
  font-weight: 700;
  margin: 0 0 var(--space-3);
}

.hero h1 {
  color: var(--off-white);
  max-width: 18ch;
}

.hero__intro {
  font-size: 1.1rem;
  max-width: 40rem;
  color: #d9dbe0;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.page-hero {
  background: var(--charcoal);
  color: var(--off-white);
  padding: var(--space-6) 0 var(--space-7);
  border-bottom: 4px solid var(--amber);
}

.page-hero h1 {
  color: var(--off-white);
}

.page-hero .lede {
  color: #d9dbe0;
}

/* -------------------------------------------------------------------------
   Buttons
   ------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.7rem 1.15rem;
  font: inherit;
  font-weight: 700;
  font-size: 0.95rem;
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  border-radius: var(--radius);
}

.btn--primary {
  background: var(--amber);
  color: var(--charcoal-deep);
}

.btn--primary:hover {
  background: #e0b01f;
  color: var(--charcoal-deep);
}

.btn--ghost {
  background: transparent;
  border-color: var(--off-white);
  color: var(--off-white);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--off-white);
}

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

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

/* -------------------------------------------------------------------------
   Summary panel, warnings, quotes, timeline
   ------------------------------------------------------------------------- */
.summary-panel {
  background: var(--charcoal-deep);
  color: var(--off-white);
  padding: var(--space-5);
  border-left: 4px solid var(--amber);
  margin: var(--space-6) 0;
}

.summary-panel__title {
  margin: 0 0 var(--space-4);
  color: var(--amber);
  font-size: 1rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 0;
  padding: 0;
  display: block;
}

.summary-panel__list {
  margin: 0;
  display: grid;
  gap: var(--space-3);
}

.summary-panel__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.15rem;
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--line);
}

.summary-panel__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.summary-panel__row dt {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #9aa0a8;
}

.summary-panel__row dd {
  margin: 0;
  font-weight: 600;
}

@media (min-width: 640px) {
  .summary-panel__row {
    grid-template-columns: 12rem 1fr;
    align-items: baseline;
  }
}

.warning-panel {
  background: #fff8e6;
  border: 1px solid var(--amber);
  border-left-width: 4px;
  padding: var(--space-4) var(--space-5);
  margin: var(--space-5) 0;
}

.warning-panel__title {
  margin: 0 0 var(--space-2);
  font-size: 1rem;
  border: 0;
  padding: 0;
  display: block;
  color: var(--amber-dark);
}

.warning-panel__body {
  margin: 0;
}

.warning-panel--danger {
  background: var(--danger-bg);
  border-color: var(--danger);
}

.warning-panel--danger .warning-panel__title {
  color: var(--danger);
}

.quote-card {
  background: var(--paper);
  border: 1px solid var(--muted-border);
  border-left: 4px solid var(--charcoal);
  padding: var(--space-5);
  margin: 0 0 var(--space-5);
}

.quote-card__quote {
  margin: 0 0 var(--space-4);
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--charcoal-deep);
}

.quote-card__quote p {
  margin: 0;
}

.quote-card__meta {
  display: grid;
  gap: var(--space-1);
}

.quote-card__date {
  font-size: 0.8125rem;
  color: var(--muted);
}

.quote-card__speaker {
  font-weight: 700;
}

.quote-card__relevance {
  margin: var(--space-2) 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.quote-card__media {
  margin-top: var(--space-4);
}

.quote-card__media img {
  border: 1px solid var(--muted-border);
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--off-white);
}

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--muted-border);
}

.timeline__item {
  position: relative;
  padding: 0 0 var(--space-5) var(--space-5);
}

.timeline__marker {
  position: absolute;
  left: -0.4rem;
  top: 0.35rem;
  width: 0.7rem;
  height: 0.7rem;
  background: var(--amber);
  border-radius: 50%;
}

.timeline__date {
  font-size: 0.8125rem;
  color: var(--muted);
  margin: 0 0 var(--space-1);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

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

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

/* -------------------------------------------------------------------------
   Cards / grids / gallery / evidence
   ------------------------------------------------------------------------- */
.grid-2 {
  display: grid;
  gap: var(--space-5);
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }
}

.stack-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.stack-links a {
  display: block;
  padding: var(--space-4);
  background: var(--off-white);
  border-left: 3px solid var(--amber);
  text-decoration: none;
  color: var(--charcoal);
  font-weight: 600;
}

.stack-links a:hover {
  background: #ebe8e0;
}

.advice-list {
  margin: 0;
  padding-left: 1.2rem;
}

.advice-list li {
  margin-bottom: var(--space-3);
}

.gallery {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
}

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

@media (min-width: 960px) {
  .gallery {
    grid-template-columns: repeat(3, 1fr);
  }
}

.gallery figure {
  margin: 0;
  background: var(--off-white);
  border: 1px solid var(--muted-border);
}

.gallery img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: #ddd;
}

.gallery figcaption {
  padding: var(--space-3);
  font-size: 0.875rem;
}

.evidence-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.evidence-filters button {
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--muted-border);
  background: var(--paper);
  color: var(--charcoal);
  cursor: pointer;
}

.evidence-filters button[aria-pressed="true"] {
  background: var(--charcoal);
  color: var(--off-white);
  border-color: var(--charcoal);
}

.evidence-grid {
  display: grid;
  gap: var(--space-5);
}

@media (min-width: 720px) {
  .evidence-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.evidence-card {
  border: 1px solid var(--muted-border);
  background: var(--paper);
  display: flex;
  flex-direction: column;
}

.evidence-card.is-hidden {
  display: none;
}

.evidence-card__thumb img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: #ddd;
}

.evidence-card__body {
  padding: var(--space-4);
}

.evidence-card__meta {
  margin: 0 0 var(--space-2);
  font-size: 0.8125rem;
  color: var(--muted);
  display: flex;
  gap: var(--space-2);
  align-items: center;
  flex-wrap: wrap;
}

.badge {
  display: inline-block;
  background: var(--charcoal);
  color: var(--off-white);
  padding: 0.15rem 0.45rem;
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.invoice-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-4) 0;
}

.invoice-table th,
.invoice-table td {
  text-align: left;
  padding: var(--space-3);
  border-bottom: 1px solid var(--muted-border);
}

.invoice-table th {
  width: 40%;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.invoice-table .total td {
  font-weight: 700;
  font-size: 1.1rem;
  border-bottom: 0;
  background: var(--off-white);
}

/* -------------------------------------------------------------------------
   Forms & alerts
   ------------------------------------------------------------------------- */
.contact-form {
  max-width: 36rem;
}

.form-row {
  margin-bottom: var(--space-4);
}

.form-row label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.form-row input[type="text"],
.form-row input[type="email"],
.form-row textarea {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--muted-border);
  background: #fff;
  font: inherit;
  color: var(--charcoal);
}

.form-row--checkbox {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-3);
  align-items: start;
}

.form-row--checkbox input {
  margin-top: 0.35rem;
}

.req {
  color: var(--danger);
}

.hp-field {
  position: absolute;
  left: -10000px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.alert {
  padding: var(--space-4);
  margin-bottom: var(--space-5);
  border-left: 4px solid;
}

.alert--success {
  background: var(--success-bg);
  border-color: var(--success);
}

.alert--error {
  background: var(--danger-bg);
  border-color: var(--danger);
}

.alert ul {
  margin: var(--space-2) 0 0;
  padding-left: 1.2rem;
}

/* -------------------------------------------------------------------------
   Breadcrumbs & footer
   ------------------------------------------------------------------------- */
.breadcrumbs {
  font-size: 0.875rem;
  margin-bottom: var(--space-4);
}

.breadcrumbs ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: var(--space-2);
  color: var(--muted);
}

.breadcrumbs a {
  color: inherit;
}

.page-hero .breadcrumbs {
  color: #b8bbc2;
}

.page-hero .breadcrumbs a {
  color: var(--amber);
}

.site-footer {
  background: var(--charcoal-deep);
  color: #c5c8ce;
  margin-top: var(--space-8);
  padding-top: var(--space-7);
}

.site-footer a {
  color: var(--amber);
}

.site-footer__grid {
  display: grid;
  gap: var(--space-6);
  padding-bottom: var(--space-6);
}

@media (min-width: 768px) {
  .site-footer__grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.site-footer__title {
  color: var(--off-white);
  font-weight: 700;
  font-size: 1.1rem;
  margin: 0 0 var(--space-3);
}

.site-footer__heading {
  color: var(--off-white);
  font-weight: 700;
  margin: 0 0 var(--space-3);
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
}

.site-footer__links ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer__links li {
  margin-bottom: var(--space-2);
}

.site-footer__notice {
  font-size: 0.85rem;
  color: #9aa0a8;
}

.site-footer__base {
  border-top: 1px solid var(--line);
  padding: var(--space-4) 0;
  font-size: 0.85rem;
}

.site-footer__base p {
  margin: 0;
}

/* -------------------------------------------------------------------------
   Utility
   ------------------------------------------------------------------------- */
.prose > *:last-child {
  margin-bottom: 0;
}

.callout-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
  justify-content: space-between;
  background: var(--off-white);
  border: 1px solid var(--muted-border);
  padding: var(--space-5);
  margin-top: var(--space-5);
}

.callout-cta p {
  margin: 0;
  max-width: 36rem;
  font-weight: 600;
}

.fact-box {
  border: 1px solid var(--muted-border);
  padding: var(--space-4);
  background: #fff;
  margin-bottom: var(--space-4);
}

.fact-box h3 {
  margin-top: 0;
}

.two-col-text {
  display: grid;
  gap: var(--space-5);
}

@media (min-width: 800px) {
  .two-col-text {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

.404-links,
.error-links {
  list-style: none;
  padding: 0;
  margin: var(--space-5) 0 0;
  display: grid;
  gap: var(--space-3);
}

.error-links a {
  font-weight: 700;
}