/* ============================================================
   Censilchem Silica — Apple-design refinement layer
   Layered on top of style.css. Non-destructive: only sharpens
   typography, materials, depth, and motion per Apple's HIG /
   "Designing Fluid Interfaces" principles.
   ============================================================ */

/* ---------- 1. Typography: optical, size-specific tracking & leading ---------- */
/* Large display text wants NEGATIVE tracking + tight leading; body near 0. */
.hero__title,
.section-title,
h1 {
  letter-spacing: -0.022em;
  line-height: 1.06;
  font-optical-sizing: auto;
}
h2 { letter-spacing: -0.018em; line-height: 1.1; }
h3 { letter-spacing: -0.012em; line-height: 1.18; }
h4 { letter-spacing: -0.006em; }
/* Body copy: tracking to 0, comfortable leading (already 1.6 in base) */
body { letter-spacing: 0; }
.section-lead, p { letter-spacing: 0; }
/* Small meta/labels want a touch of POSITIVE tracking for legibility */
.sol-card__apps, .meta, figcaption, .card-meta { letter-spacing: 0.005em; }

/* ---------- 2. Materials & depth: translucent chrome, tiered shadows ---------- */
:root {
  /* Depth tiers — bigger surfaces read as thicker (stronger blur + deeper shadow) */
  --shadow-card:  0 1px 2px rgba(16,31,26,.05), 0 6px 16px rgba(16,31,26,.05);
  --shadow-lift:  0 8px 20px rgba(16,31,26,.10), 0 20px 48px rgba(16,31,26,.08);
  --ease-out-soft: cubic-bezier(0.22, 1, 0.36, 1);   /* iOS-like decelerate */
  --ease-in-out-soft: cubic-bezier(0.65, 0, 0.35, 1);
}

/* Header: richer frosted material (was blur 10px) — brighter top edge = light catching glass */
.site-header {
  background: rgba(255,255,255,.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  box-shadow: 0 1px 0 rgba(16,31,26,.06);
  border-bottom: 1px solid rgba(223,228,225,.6);
}

/* Mega dropdown: read as a real floating material arriving (materialize, don't just fade) */
.mega {
  background: rgba(255,255,255,.82);
  backdrop-filter: saturate(180%) blur(24px);
  -webkit-backdrop-filter: saturate(180%) blur(24px);
  box-shadow: var(--shadow-lift);
  transition: opacity .22s var(--ease-out-soft),
              transform .28s var(--ease-out-soft),
              visibility .22s;
}

/* ---------- 3. Springy, physical interactions ---------- */
/* Cards: lift with an iOS-decelerate curve; deeper, tiered shadow */
.sol-card,
.card,
.case-card,
.doc-card,
.wp-card,
.feature {
  transition: transform .38s var(--ease-out-soft),
              box-shadow .38s var(--ease-out-soft),
              border-color .28s ease;
  will-change: transform;
}
.sol-card:hover,
.card:hover,
.case-card:hover,
.wp-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lift);
}

/* Buttons: respond on the PRESS, instant + continuous; scale down when held */
.btn { transition: transform .2s var(--ease-out-soft), background .2s ease, color .2s ease, border-color .2s ease; }
.btn:hover { transform: translateY(-1.5px); }
.btn:active { transform: scale(0.97) translateY(0); transition: transform 90ms ease-out; }

/* Nav links + interactive rows get the same press feedback */
.nav__links > li > a { transition: color .2s, background .2s var(--ease-out-soft); }
.mega__item:active,
.sol-card__link:active { transform: scale(0.98); }

/* Anchor dropdowns/popovers to their trigger, not their center */
.nav__links > li { position: relative; }

/* ---------- 4. Scroll-reveal entrance (spring-like, staggered) ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .6s var(--ease-out-soft), transform .6s var(--ease-out-soft);
  will-change: transform, opacity;
}
[data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 5. Scroll edge effect instead of a hard divider under header ---------- */
.hero,
.section:first-of-type {
  --edge: 0;
}

/* ---------- 6. Focus: keep it crisp and on-brand ---------- */
:focus-visible { outline: 2px solid var(--teal); outline-offset: 3px; border-radius: 3px; }

/* ---------- 7. Accessibility: reduced motion / transparency / contrast ---------- */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
  [data-reveal] { opacity: 1; transform: none; transition: opacity .2s ease; }
  .sol-card:hover, .card:hover, .case-card:hover, .wp-card:hover { transform: none; }
  .btn:hover { transform: none; }
  .btn:active { transform: none; }
}
@media (prefers-reduced-transparency: reduce) {
  .site-header { background: #fff; backdrop-filter: none; -webkit-backdrop-filter: none; }
  .mega { background: #fff; backdrop-filter: none; -webkit-backdrop-filter: none; }
}
@media (prefers-contrast: more) {
  .site-header { background: #fff; border-bottom-color: var(--ink); }
  .sol-card, .card { border: 1px solid var(--ink-3); }
}

/* ---------- Related solutions internal links ---------- */
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: .9rem;
  margin-top: 1rem;
}
.related-card {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  padding: 1rem 1.15rem;
  background: #fff;
  border: 1px solid var(--ink-4, #e5e9e7);
  border-radius: 12px;
  text-decoration: none;
  transition: transform .3s var(--ease-out-soft), box-shadow .3s var(--ease-out-soft), border-color .3s ease;
}
.related-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
  border-color: var(--teal);
}
.related-card strong {
  font-family: var(--font-display, inherit);
  font-size: .95rem;
  color: var(--ink, #101F1A);
  letter-spacing: -0.01em;
}
.related-card span {
  font-size: .8rem;
  color: var(--ink-3, #6b7674);
  line-height: 1.4;
}
.related-card--accent {
  background: var(--wash, #f4f7f6);
  border-style: dashed;
}
.related-card--accent strong { color: var(--teal); }

/* ---------- Case study cards ---------- */
.case-card { border: 1px solid var(--ink-4, #e5e9e7); }
.case-results li { margin-bottom: .25rem; line-height: 1.4; }
.case-quote cite { font-weight: 500; }

/* ---------- Team member cards ---------- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.5rem;
}
.team-card {
  background: #fff;
  border: 1px solid var(--ink-4, #e5e9e7);
  border-radius: 14px;
  overflow: hidden;
  transition: transform .38s var(--ease-out-soft), box-shadow .38s var(--ease-out-soft);
}
.team-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lift); }
.team-card__photo {
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
  display: block;
}
.team-card__body { padding: 1.15rem 1.25rem 1.4rem; }
.team-card__name {
  font-size: 1.1rem;
  margin: 0 0 .2rem;
  letter-spacing: -0.01em;
}
.team-card__role {
  font-size: .85rem;
  color: var(--teal);
  font-weight: 500;
  margin: 0 0 .6rem;
}
.team-card__bio {
  font-size: .84rem;
  color: var(--ink-3, #6b7674);
  line-height: 1.5;
  margin: 0;
}

/* ---------- Customer visit gallery ---------- */
.visit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}
.visit-card {
  margin: 0;
  background: #fff;
  border: 1px solid var(--ink-4, #e5e9e7);
  border-radius: 14px;
  overflow: hidden;
  transition: transform .38s var(--ease-out-soft), box-shadow .38s var(--ease-out-soft);
}
.visit-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lift); }
.visit-card img {
  width: 100%;
  aspect-ratio: 3/2;
  object-fit: cover;
  display: block;
}
.visit-card figcaption { padding: 1rem 1.15rem 1.2rem; }
.visit-card figcaption strong {
  display: block;
  font-family: var(--font-display, inherit);
  font-size: 1rem;
  margin-bottom: .3rem;
  letter-spacing: -0.01em;
}
.visit-card figcaption span {
  font-size: .85rem;
  color: var(--ink-3, #6b7674);
  line-height: 1.5;
}

/* ---------- Media center image gallery ---------- */
.gallery-cat { margin-bottom: 3.5rem; }
.gallery-cat h2 { font-size: 1.4rem; margin-bottom: .4rem; letter-spacing: -0.01em; }
.gallery-cat__desc { color: var(--ink-3, #6b7674); font-size: .9rem; margin-bottom: 1.5rem; }
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}
.gallery-tile {
  position: relative;
  display: block;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--ink-4, #e5e9e7);
  text-decoration: none;
  aspect-ratio: 3/2;
}
.gallery-tile img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .5s var(--ease-out-soft);
}
.gallery-tile:hover img { transform: scale(1.05); }
.gallery-tile__dl {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: .6rem .8rem;
  background: linear-gradient(transparent, rgba(16,31,26,.85));
  color: #fff;
  font-size: .78rem;
  font-weight: 500;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .35s ease, transform .35s ease;
}
.gallery-tile:hover .gallery-tile__dl { opacity: 1; transform: translateY(0); }

/* ---------- Solution card images (homepage) ---------- */
.sol-card__img {
  margin: 0 0 1rem;
  border-radius: 12px;
  overflow: hidden;
  height: 200px;
  width: 100%;
}
.sol-card__img img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  object-position: center;
  display: block;
  transition: transform .55s var(--ease-out-soft, ease);
}
.sol-card:hover .sol-card__img img {
  transform: scale(1.05);
}

/* ============ Media center — story layout ============ */
.story-block { margin-bottom: 5rem; }
.story-block > h2 { font-size: 1.7rem; margin: .35rem 0 .5rem; letter-spacing: -0.015em; }
.show-note { font-size: .85rem; color: var(--ink-3, #6b7674); background: var(--paper-2, #F4F8F5);
  border-left: 3px solid var(--teal, #1E5C48); border-radius: 0 6px 6px 0;
  padding: .85rem 1.1rem; margin: 0 0 2.2rem; line-height: 1.65; max-width: 760px; }

/* 流程步骤：编号 + 图 + 文 */
.story-steps { list-style: none; counter-reset: st; padding: 0; margin: 0;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.6rem 1.4rem; }
.story-steps--visit { grid-template-columns: repeat(4, 1fr); }
.story-step { counter-increment: st; position: relative; }
.story-step__img { display: block; position: relative; overflow: hidden;
  border-radius: 8px; border: 1px solid var(--line, #dce7e1); background: #edf4f0; }
.story-step__img img { display: block; width: 100%; height: auto; aspect-ratio: 4 / 3;
  object-fit: cover; transition: transform .5s ease; }
.story-step__img:hover img { transform: scale(1.05); }
.story-step__img::before { content: counter(st, decimal-leading-zero);
  position: absolute; left: 10px; top: 10px; z-index: 2;
  font-family: var(--font-display); font-size: .72rem; font-weight: 600; letter-spacing: .04em;
  color: #fff; background: rgba(30,92,72,.92); padding: .22rem .5rem; border-radius: 4px; }
.story-step__text h3 { font-size: .98rem; margin: .7rem 0 .25rem; }
.story-step__text p { font-size: .84rem; line-height: 1.6; color: var(--ink-3, #6b7674); margin: 0; }

/* 展会时间轴 */
.showline { position: relative; padding-left: 6rem; }
.showline::before { content: ""; position: absolute; left: 4rem; top: .6rem; bottom: 1rem;
  width: 2px; background: linear-gradient(180deg, var(--teal,#1E5C48) 0%, var(--line,#dce7e1) 100%); }
.show { position: relative; padding-bottom: 3.2rem; }
.show:last-child { padding-bottom: 0; }
.show__marker { position: absolute; left: -6rem; top: 0; width: 3rem; text-align: right; }
.show__year { display: inline-block; font-family: var(--font-display); font-weight: 600;
  font-size: 1.02rem; color: var(--teal, #1E5C48); background: #fff;
  padding: .12rem 0 .3rem; position: relative; }
.show::before { content: ""; position: absolute; left: -2.47rem; top: .42rem;
  width: 11px; height: 11px; border-radius: 50%; background: #fff;
  border: 3px solid var(--teal, #1E5C48); z-index: 2; }
.show__body h3 { font-size: 1.12rem; margin: 0 0 .2rem; }
.show__meta { font-size: .85rem; color: var(--ink-3, #6b7674); margin: 0 0 .6rem; }
.show__track { color: var(--teal, #1E5C48); font-weight: 500; }
.show__story { font-size: .9rem; line-height: 1.7; color: var(--ink-2, #3d4b49);
  margin: 0 0 1.1rem; max-width: 680px; }
.show__imgs { display: grid; grid-template-columns: repeat(4, 1fr); gap: .8rem; }
.show__imgs .gallery-tile img { aspect-ratio: 4 / 3; object-fit: cover; }

.gallery-tile--map { display: block; max-width: 560px; }
.media-note { margin-top: 1rem; font-size: .85rem; color: var(--ink-3, #6b7674); }
.media-note a { color: var(--teal, #1E5C48); }

@media (max-width: 900px) {
  .story-steps, .story-steps--visit { grid-template-columns: repeat(2, 1fr); }
  .show__imgs { grid-template-columns: repeat(2, 1fr); }
  .showline { padding-left: 4.6rem; }
  .showline::before { left: 3rem; }
  .show__marker { left: -4.6rem; width: 2.3rem; }
  .show::before { left: -1.72rem; }
}
@media (max-width: 560px) {
  .story-steps, .story-steps--visit { grid-template-columns: 1fr 1fr; gap: 1.1rem .9rem; }
  .story-block > h2 { font-size: 1.4rem; }
}

/* Scope / compliance note on solution pages */
.scope-note { background: var(--paper-2, #F4F8F5); border-left: 3px solid var(--teal, #1E5C48);
  border-radius: 0 8px 8px 0; padding: 1.1rem 1.35rem; margin: 0 0 2rem; }
.scope-note strong { display: block; font-family: var(--font-display); font-size: .8rem;
  letter-spacing: .06em; text-transform: uppercase; color: var(--teal, #1E5C48); margin-bottom: .6rem; }
.scope-note p { font-size: .89rem; line-height: 1.7; color: var(--ink-2, #3d4b49); margin: 0 0 .7rem; }
.scope-note--alt { background: #fff; border: 1px solid var(--line, #dce7e1); border-left: 3px solid var(--sand, #C08A52); margin: 2.5rem 0 0; }
.scope-note--alt strong { color: var(--sand, #C08A52); }

/* Muted tag — for historical / archived case studies */
.grade-tag--muted { background: var(--line-2, #edf4f0) !important; color: var(--ink-3, #6b7674) !important; }