/* ==========================================================================
   SUSTAIN(TM) Tree-Free CPG Board — sustainpackaging.com
   Design tokens + shared layout. Palette derived from Sustain_Logo.png
   per build handoff Section 3. Typography: Cinzel (display) / Poppins (UI+body).
   ========================================================================== */

:root {
  /* ---- Palette (from logo) ---- */
  --bronze:       #8C7356;  /* primary — display headings, wordmark, large accents */
  --bronze-deep:  #75604A;  /* darkened bronze — buttons, links, small text (WCAG AA on ivory/paper) */
  --tan:          #B29B7C;  /* secondary — sub-labels, hover states */
  --gold:         #C5AA7E;  /* accent — thin rules, dividers, small details */
  --ivory:        #F5F1E8;  /* section background alt */
  --paper:        #FAF7F2;  /* page background */
  --charcoal:     #2E2A24;  /* body text */
  --charcoal-soft:#57503F;  /* muted body text (AA on ivory) */
  --emerald:      #006837;  /* SPARINGLY — footer "by Emerald Ecovations" link only */

  /* ---- Typography ---- */
  --font-display: "Cinzel", "Times New Roman", serif;
  --font-body:    "Poppins", "Helvetica Neue", Arial, sans-serif;

  --track-display: 0.14em;   /* generous letter-spacing for Cinzel caps */
  --track-label:   0.22em;   /* Poppins uppercase labels */

  /* ---- Scale ---- */
  --text-hero:  clamp(2rem, 4.6vw, 3.4rem);
  --text-h2:    clamp(1.5rem, 3vw, 2.25rem);
  --text-h3:    0.875rem;              /* uppercase Poppins label headings */
  --text-body:  1.0625rem;
  --text-small: 0.875rem;

  /* ---- Rhythm ---- */
  --space-section: clamp(4.5rem, 9vw, 7.5rem);
  --measure: 62ch;
  --container: 1140px;
  --container-pad: clamp(1.25rem, 5vw, 2.5rem);

  /* ---- Details ---- */
  --rule-gold: 1px solid var(--gold);
  --radius-btn: 2px;                   /* square / barely rounded */
  --shadow-card: 0 1px 0 rgba(140, 115, 86, 0.18), 0 14px 34px -22px rgba(46, 42, 36, 0.28);
  --transition: 0.25s ease;
}

/* ==========================================================================
   Reset / base
   ========================================================================== */

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

html { scroll-padding-top: 96px; }

body {
  margin: 0;
  background-color: var(--paper);
  /* Subtle paper-fiber texture (very low contrast, pre-rendered tile) */
  background-image: url("../assets/texture-paper.png");
  color: var(--charcoal);
  font-family: var(--font-body);
  font-weight: 300;
  font-size: var(--text-body);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

p { margin: 0 0 1.25rem; }
p:last-child { margin-bottom: 0; }

a { color: var(--bronze-deep); text-decoration-color: var(--gold); text-underline-offset: 3px; transition: color var(--transition); }
a:hover { color: var(--tan); }

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

::selection { background: var(--gold); color: var(--charcoal); }

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2 {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--bronze);
  text-transform: uppercase;
  letter-spacing: var(--track-display);
  line-height: 1.25;
  margin: 0 0 1.5rem;
}

h1 { font-size: var(--text-hero); text-wrap: balance; }
h2 { font-size: var(--text-h2); text-wrap: balance; }

h3, .label {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: var(--text-h3);
  color: var(--bronze-deep);
  text-transform: uppercase;
  letter-spacing: var(--track-label);
  line-height: 1.5;
  margin: 0 0 0.875rem;
}

.tm { font-size: 0.5em; vertical-align: super; letter-spacing: 0; }

.lede {
  font-size: 1.1875rem;
  font-weight: 300;
  color: var(--charcoal-soft);
  max-width: var(--measure);
}

.center { text-align: center; }
.center .lede { margin-inline: auto; }

/* Thin gold rule motif (echoes the logo) */
.rule {
  border: 0;
  border-top: var(--rule-gold);
  width: 72px;
  margin: 0 0 1.75rem;
}
.rule--center { margin-inline: auto; }
.rule--full { width: 100%; opacity: 0.55; }

/* ==========================================================================
   Layout
   ========================================================================== */

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section { padding-block: var(--space-section); }
.section--ivory { background-color: var(--ivory); }
.section--tight { padding-block: calc(var(--space-section) * 0.62); }

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: var(--track-label);
  text-decoration: none;
  text-align: center;
  padding: 1rem 2.25rem;
  border: 1px solid transparent;
  border-radius: var(--radius-btn);
  background-color: var(--bronze-deep);
  color: var(--ivory);
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}
.btn:hover, .btn:focus-visible {
  background-color: var(--tan);
  color: var(--charcoal);
}

.btn--ghost {
  background-color: transparent;
  border-color: var(--bronze-deep);
  color: var(--bronze-deep);
}
.btn--ghost:hover, .btn--ghost:focus-visible {
  background-color: var(--bronze-deep);
  color: var(--ivory);
  border-color: var(--bronze-deep);
}

.text-link {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: var(--track-label);
  color: var(--bronze-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  padding-bottom: 0.3rem;
  transition: color var(--transition), border-color var(--transition);
}
.text-link:hover { color: var(--tan); border-color: var(--tan); }

/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--paper);
  border-bottom: var(--rule-gold);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 84px;
}

.site-header__logo img { height: 52px; width: auto; }

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 2.5vw, 2.25rem);
}

.site-nav a:not(.btn) {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--charcoal);
  text-decoration: none;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.site-nav a:not(.btn):hover,
.site-nav a:not(.btn)[aria-current="page"] {
  color: var(--bronze-deep);
  border-bottom-color: var(--gold);
}

.site-nav .btn { padding: 0.7rem 1.4rem; }

/* Mobile nav */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--gold);
  border-radius: var(--radius-btn);
  padding: 0.55rem 0.7rem;
  cursor: pointer;
}
.nav-toggle__bar {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--bronze-deep);
  margin: 5px 0;
  transition: transform var(--transition), opacity var(--transition);
}

@media (max-width: 860px) {
  .nav-toggle { display: block; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background-color: var(--paper);
    border-bottom: var(--rule-gold);
    padding: 0.5rem var(--container-pad) 1.5rem;
    display: none;
  }
  .site-nav.is-open { display: flex; }

  .site-nav a:not(.btn) {
    padding: 1rem 0;
    border-bottom: 1px solid rgba(197, 170, 126, 0.35);
  }
  .site-nav .btn { margin-top: 1.25rem; }

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

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  padding-block: clamp(5.5rem, 12vw, 9.5rem);
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* faint horizontal fiber striations behind the hero */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    180deg,
    transparent 0 34px,
    rgba(178, 155, 124, 0.075) 34px 35px
  );
  -webkit-mask-image: radial-gradient(ellipse 75% 65% at 50% 45%, #000 30%, transparent 78%);
          mask-image: radial-gradient(ellipse 75% 65% at 50% 45%, #000 30%, transparent 78%);
}

.hero__kicker { margin-bottom: 1.5rem; }

.hero h1 {
  max-width: 21ch;
  margin-inline: auto;
}

.hero .lede {
  margin: 0 auto 2.75rem;
  max-width: 56ch;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 1.5rem 2.25rem;
}

/* Interior page hero — shorter than the home hero */
.hero--page { padding-block: clamp(4rem, 8vw, 6.5rem); }
.hero--page::before { content: none; }

.container--narrow { max-width: 860px; }

/* ==========================================================================
   Specifications table
   ========================================================================== */

.spec-table-wrap {
  overflow-x: auto;
  background-color: var(--paper);
  border: 1px solid rgba(197, 170, 126, 0.5);
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-small);
  line-height: 1.7;
}

.spec-table th,
.spec-table td {
  text-align: left;
  vertical-align: top;
  padding: 1.1rem 1.5rem;
  border-bottom: 1px solid rgba(197, 170, 126, 0.4);
}
.spec-table tr:last-child th,
.spec-table tr:last-child td { border-bottom: 0; }

.spec-table th {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--bronze-deep);
  white-space: nowrap;
  width: 1%;
}

.spec-table td { font-weight: 300; color: var(--charcoal); }

.spec-note { color: var(--charcoal-soft); font-style: italic; }

/* ==========================================================================
   Board construction diagrams
   ========================================================================== */

.board-diagrams {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1.5rem, 3vw, 2.5rem);
  max-width: 760px;
  margin: 2.5rem auto 0;
}
@media (max-width: 640px) {
  .board-diagrams { grid-template-columns: 1fr; }
}

.board-diagram {
  margin: 0;
  background-color: var(--paper);
  border: 1px solid rgba(197, 170, 126, 0.5);
  padding: 1.5rem 1rem 1.25rem;
}
.board-diagram svg { width: 100%; height: auto; }
.board-diagram figcaption {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: var(--track-label);
  color: var(--bronze-deep);
  margin-top: 0.75rem;
}

.diagram-note {
  font-size: 0.8125rem;
  font-style: italic;
  color: var(--charcoal-soft);
  margin-top: 1.5rem;
}

.grid--align-center { align-items: center; }

/* When an image slot precedes text in source order, drop it below the text on mobile */
@media (max-width: 720px) {
  .img-slot--last-mobile { order: 2; }
}

/* ==========================================================================
   Cards / grids
   ========================================================================== */

.grid {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
}
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }

@media (max-width: 960px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .grid--3, .grid--4, .grid--2 { grid-template-columns: 1fr; }
}

.pillar { text-align: center; padding-inline: 0.5rem; }

.pillar__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 1.5rem;
  color: var(--bronze);
}
.pillar__icon svg { width: 100%; height: 100%; }

.pillar p { font-size: var(--text-small); line-height: 1.8; color: var(--charcoal-soft); max-width: 34ch; margin-inline: auto; }

.fact-figure {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2rem, 4vw, 2.75rem);
  color: var(--bronze);
  letter-spacing: 0.06em;
  margin: 0 0 0.5rem;
}

/* Application cards */
.app-card {
  display: block;
  text-decoration: none;
  background-color: var(--paper);
  border: 1px solid rgba(197, 170, 126, 0.45);
  padding: 2.5rem 1.75rem 2.25rem;
  text-align: center;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.app-card:hover {
  border-color: var(--gold);
  box-shadow: var(--shadow-card);
  transform: translateY(-3px);
}
.app-card .rule { width: 40px; margin: 0 auto 1.25rem; }
.app-card h3 { color: var(--bronze); margin-bottom: 0.75rem; }
.app-card p { font-size: var(--text-small); color: var(--charcoal-soft); margin: 0; }
.app-card__go {
  display: inline-block;
  margin-top: 1.25rem;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: var(--track-label);
  text-transform: uppercase;
  color: var(--bronze-deep);
}

/* Quote block */
.quote {
  max-width: 46rem;
  margin-inline: auto;
  text-align: center;
}
.quote blockquote {
  margin: 0 0 1.75rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.25rem, 2.4vw, 1.625rem);
  line-height: 1.6;
  color: var(--charcoal);
}
.quote cite {
  font-style: normal;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: var(--track-label);
  color: var(--bronze-deep);
}

/* ==========================================================================
   CTA band
   ========================================================================== */

.cta-band {
  background-color: var(--charcoal);
  color: var(--ivory);
  text-align: center;
  padding-block: calc(var(--space-section) * 0.85);
  position: relative;
}
.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(ellipse 90% 120% at 50% -20%, rgba(197, 170, 126, 0.12), transparent 60%);
}
.cta-band > .container { position: relative; }
.cta-band h2 { color: var(--gold); }
.cta-band p {
  color: rgba(245, 241, 232, 0.85);
  max-width: 52ch;
  margin: 0 auto 2.5rem;
}
.cta-band .btn {
  background-color: var(--gold);
  color: var(--charcoal);
}
.cta-band .btn:hover, .cta-band .btn:focus-visible {
  background-color: var(--ivory);
  color: var(--charcoal);
}

/* ==========================================================================
   Image placeholder slots (photography drops in later)
   ========================================================================== */

/* Homepage hero photo — framed header piece above the CTAs */
.hero__photo {
  margin: 0 auto 2.75rem;
  max-width: 920px;
  border: 1px solid rgba(197, 170, 126, 0.5);
  background-color: var(--ivory);
  overflow: hidden;
}
.hero__photo img {
  width: 100%;
  height: clamp(240px, 40vw, 460px);
  object-fit: cover;
  object-position: center 42%;
  display: block;
}

.site-photo {
  margin: 0;
  border: 1px solid rgba(197, 170, 126, 0.5);
  background-color: var(--ivory);
}
.site-photo img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  display: block;
}
@media (max-width: 720px) {
  .site-photo--last-mobile { order: 2; }
}

.img-slot {
  position: relative;
  background:
    linear-gradient(135deg, rgba(197, 170, 126, 0.14), rgba(178, 155, 124, 0.22)),
    var(--ivory);
  border: 1px solid rgba(197, 170, 126, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 260px;
}
.img-slot span {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--track-label);
  color: var(--tan);
}

/* ==========================================================================
   Allocation form
   ========================================================================== */

.allocation-form {
  background-color: var(--paper);
  border: 1px solid rgba(197, 170, 126, 0.5);
  padding: clamp(1.75rem, 4vw, 3rem);
}

.hp-field { position: absolute; left: -9999px; height: 0; overflow: hidden; }

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem 2rem;
}
@media (max-width: 640px) {
  .form-grid { grid-template-columns: 1fr; }
}

.form-field { display: flex; flex-direction: column; }
.form-field--full { grid-column: 1 / -1; }

.form-field label {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--bronze-deep);
  margin-bottom: 0.5rem;
}

.req { color: var(--bronze); margin-left: 0.2em; }

.form-field input,
.form-field select,
.form-field textarea {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 1rem;
  color: var(--charcoal);
  background-color: var(--ivory);
  border: 1px solid rgba(197, 170, 126, 0.6);
  border-radius: var(--radius-btn);
  padding: 0.8rem 1rem;
  transition: border-color var(--transition), background-color var(--transition);
}
.form-field textarea { resize: vertical; }

.form-field input::placeholder,
.form-field textarea::placeholder { color: var(--tan); }

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--bronze-deep);
  background-color: var(--paper);
}

.form-field select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%2375604A' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.form-actions {
  margin-top: 2.25rem;
  display: flex;
  align-items: center;
  gap: 1rem 2.5rem;
  flex-wrap: wrap;
}

.form-fallback { font-size: var(--text-small); color: var(--charcoal-soft); margin: 0; }

.converter-note {
  margin-top: 2rem;
  padding: 1.5rem 1.75rem;
  border-left: 2px solid var(--gold);
  font-size: var(--text-small);
  color: var(--charcoal-soft);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background-color: var(--ivory);
  border-top: var(--rule-gold);
  padding-block: 4rem 2.5rem;
  text-align: center;
}

.footer-wordmark {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.5rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--bronze);
  text-decoration: none;
}
.footer-wordmark .tm { font-size: 0.45em; }

.site-footer .rule { margin: 1.25rem auto; width: 56px; }

.footer-by {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: var(--track-label);
  text-transform: uppercase;
}
.footer-by a {
  color: var(--emerald);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}
.footer-by a:hover { border-bottom-color: var(--emerald); color: var(--emerald); }

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.25rem 2rem;
  margin: 2.25rem 0 1.75rem;
}
.footer-nav a {
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--charcoal-soft);
}
.footer-nav a:hover { color: var(--bronze-deep); }

.footer-contact { font-size: var(--text-small); color: var(--charcoal-soft); margin-bottom: 0.5rem; }
.footer-contact a { font-weight: 400; }

.footer-ee-line { font-size: var(--text-small); color: var(--charcoal-soft); margin-bottom: 2rem; }

.footer-legal {
  font-size: 0.75rem;
  color: var(--charcoal-soft);
  border-top: 1px solid rgba(197, 170, 126, 0.4);
  padding-top: 1.75rem;
  margin-top: 0.5rem;
}

/* ==========================================================================
   Reveal on scroll (JS adds .is-visible; safe no-JS default = visible)
   ========================================================================== */

@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.7s ease, transform 0.7s ease;
  }
  .reveal.is-visible { opacity: 1; transform: none; }
  .no-js .reveal { opacity: 1; transform: none; }
}

/* ==========================================================================
   Small screens
   ========================================================================== */

@media (max-width: 480px) {
  .site-header__logo img { height: 42px; }
  .hero__actions { flex-direction: column; }
  .btn { width: 100%; max-width: 320px; }
  .site-nav .btn { width: auto; max-width: none; }
}