/* ============================================================
   Visual Reality — Innovation Timeline (timeline.css)
   Flip cards · scroll-driven spine · era rail · filters
   Loads AFTER styles.css (shared base)
   ============================================================ */

/* ---------- Page hero ---------- */
.tl-hero {
  padding: clamp(2.6rem, 6vw, 4.4rem) 0 clamp(1.4rem, 3vw, 2rem);
  background:
    radial-gradient(56rem 26rem at 82% -8%, rgba(13, 148, 136, 0.1), transparent 60%),
    radial-gradient(44rem 22rem at 8% 4%, rgba(14, 159, 110, 0.09), transparent 55%);
}

.tl-lead {
  max-width: 44rem;
  margin: 0 0 2.1rem;
  font-size: 1.12rem;
  color: var(--ink-soft);
}

/* ---------- Horizontal era rail (mini-map) ---------- */
.rail {
  position: relative;
  max-width: 860px;
  padding: 0.9rem 0.4rem 2.5rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: var(--shadow-sm);
}

.rail-track {
  position: relative;
  height: 3px;
  margin: 0 1.6rem;
  border-radius: 3px;
  background: #dcefe5;
}

.rail-line {
  position: absolute;
  inset: 0;
  border-radius: 3px;
}

.rail-fill {
  position: absolute;
  inset: 0;
  border-radius: 3px;
  background: var(--grad);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.15s linear;
}

.rail-dots {
  position: relative;
  display: flex;
  justify-content: space-between;
  margin: -12px 1.1rem 0;
}

.rail-dot {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.55rem;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
}

.rail-dot .rd {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: #ffffff;
  border: 2.5px solid #bcd9ca;
  transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.rail-dot:hover .rd,
.rail-dot:focus-visible .rd {
  border-color: var(--teal);
  transform: scale(1.18);
}

.rail-dot.lit .rd {
  border-color: var(--brand);
  background: var(--brand);
  box-shadow: 0 0 0 4px rgba(14, 159, 110, 0.16);
}

.rd-y {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.02em;
  transition: color 0.25s ease;
}

.rail-dot.lit .rd-y {
  color: var(--brand-deep);
}

.rail-eras {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.05rem;
  height: 1.9rem;
  pointer-events: none;
}

.rail-era {
  position: absolute;
  left: var(--x);
  transform: translateX(-50%);
  pointer-events: auto;
  border: 0;
  background: none;
  padding: 0.15rem 0.7rem;
  font-family: var(--font-head);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
  cursor: pointer;
  border-radius: 999px;
  transition: color 0.2s ease, background 0.2s ease;
  white-space: nowrap;
}

.rail-era:hover,
.rail-era:focus-visible {
  color: var(--brand-deep);
  background: var(--mint);
}

/* ---------- Timeline head + filters ---------- */
.tl-section {
  padding: clamp(2.4rem, 5vw, 4rem) 0 clamp(2rem, 4vw, 3rem);
}

.tl-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.6rem;
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.tl-head h2 {
  margin-bottom: 0.35em;
}

.tl-head .section-sub {
  max-width: 30rem;
  margin: 0;
}

.tl-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tl-filter {
  padding: 0.5rem 1.05rem;
  border: 1.5px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink-soft);
  font-weight: 600;
  font-size: 0.92rem;
  transition: all 0.22s ease;
}

.tl-filter:hover {
  border-color: var(--brand);
  color: var(--brand-deep);
}

.tl-filter.active {
  background: var(--grad);
  border-color: transparent;
  color: #ffffff;
  box-shadow: 0 6px 16px rgba(13, 148, 136, 0.28);
}

.tl-count {
  margin: 0.55rem 0 0;
  font-size: 0.82rem;
  color: var(--muted);
  text-align: right;
}

/* ---------- The spine ---------- */
.tl-wrap {
  position: relative;
  max-width: 1080px;
  margin: 0 auto;
}

.tl-spine {
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 50%;
  width: 4px;
  transform: translateX(-50%);
  background: #dcefe5;
  border-radius: 4px;
}

.tl-fill {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0;
  background: var(--grad);
  border-radius: 4px;
}

.tl-fill::after {
  content: "";
  position: absolute;
  bottom: -7px;
  left: 50%;
  transform: translateX(-50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 5px rgba(13, 148, 136, 0.16), 0 0 20px rgba(13, 148, 136, 0.55);
}

/* ---------- Era bands ---------- */
.tl-era {
  position: relative;
  width: min(100%, 620px);
  margin: 1.2rem auto 2.4rem;
  text-align: center;
}

.tl-era-node {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--surface);
  border: 3px solid #cfe6da;
  z-index: 2;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.tl-era.lit .tl-era-node {
  border-color: var(--brand);
  box-shadow: 0 0 0 6px rgba(14, 159, 110, 0.14);
}

.tl-era-card {
  padding: 1.6rem clamp(1.4rem, 4vw, 2.6rem) 1.5rem;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}

.tl-era-card h3 {
  margin: 0.15em 0 0.4em;
  font-size: 1.55rem;
}

.tl-era-card p {
  margin: 0;
  font-size: 0.98rem;
  color: var(--ink-soft);
}

.tl-era-range {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--brand-deep);
}

.era-past .tl-era-range { color: #b45309; }
.era-present .tl-era-range { color: var(--brand-deep); }
.era-future .tl-era-range { color: #0d7495; }

.era-past .tl-era-card { background: linear-gradient(160deg, #fffdf6 0%, #fdf6e7 100%); }
.era-present .tl-era-card { background: linear-gradient(160deg, #ffffff 0%, #effaf3 100%); }
.era-future .tl-era-card { background: linear-gradient(160deg, #ffffff 0%, #ecf6fa 100%); }

/* ---------- Timeline items ---------- */
.tl-item {
  position: relative;
  width: calc(50% - 46px);
  margin: 0 auto 2.5rem 0; /* left side by default */
}

.tl-item.right {
  margin: 0 auto 2.5rem calc(50% + 46px);
}

.tl-item[hidden] {
  display: none;
}

.tl-era[hidden] {
  display: none;
}

.tl-era,
.tl-item {
  scroll-margin-top: 108px;
}

.tl-node {
  position: absolute;
  top: 30px;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: var(--surface);
  border: 3px solid #bcd9ca;
  z-index: 2;
  transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

.tl-item:not(.right) .tl-node {
  right: -57px;
}

.tl-item.right .tl-node {
  left: -57px;
}

.tl-item.lit .tl-node {
  border-color: var(--brand);
  transform: scale(1.12);
  box-shadow: 0 0 0 5px rgba(14, 159, 110, 0.15);
}
/* ---------- Flip cards ---------- */
.tl-card {
  position: relative;
  height: var(--card-h, 380px);
  perspective: 1500px;
  cursor: pointer;
  border-radius: var(--radius);
}

.tl-card:focus-visible {
  outline: 3px solid rgba(14, 159, 110, 0.5);
  outline-offset: 4px;
}

.tl-card.flash {
  animation: tlFlash 1.5s ease;
}

@keyframes tlFlash {
  0%, 100% { box-shadow: 0 0 0 0 rgba(13, 148, 136, 0); }
  30% { box-shadow: 0 0 0 8px rgba(13, 148, 136, 0.3); }
}

.tl-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.75s cubic-bezier(0.35, 0.1, 0.25, 1);
}

.tl-card.flipped .tl-card-inner {
  transform: rotateY(180deg);
}

@media (hover: hover) and (pointer: fine) {
  .tl-card:hover .tl-card-inner {
    transform: rotateY(180deg);
  }
}

.tl-face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  padding: 1.35rem 1.5rem 1.2rem;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  overflow: hidden;
}

.tl-face.back {
  transform: rotateY(180deg);
  background: linear-gradient(165deg, #f4fbf7 0%, #e9f6f1 100%);
}

/* Era-tinted backs */
.tl-item[data-era="past"] .tl-face.back { background: linear-gradient(165deg, #fffcf3 0%, #f9efdc 100%); }
.tl-item[data-era="future"] .tl-face.back { background: linear-gradient(165deg, #f2fafd 0%, #e4f2f8 100%); }

/* ---------- Card front ---------- */
.tl-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  margin-bottom: 0.9rem;
}

.tl-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.42rem;
  padding: 0.32rem 0.78rem;
  border-radius: 999px;
  background: var(--mint);
  color: var(--brand-deep);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.tl-era-tag {
  font-family: var(--font-head);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.tl-item[data-era="past"] .tl-era-tag { color: #b45309; }
.tl-item[data-era="present"] .tl-era-tag { color: var(--brand-deep); }
.tl-item[data-era="future"] .tl-era-tag { color: #0d7495; }

.tl-year {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.9rem;
  font-weight: 800;
  line-height: 1;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tl-face h3 {
  margin: 0.5rem 0 0.45rem;
  font-size: 1.28rem;
  line-height: 1.25;
}

.tl-teaser {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.55;
  color: var(--ink-soft);
}

.tl-hint {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin: auto 0 0;
  padding-top: 0.9rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.tl-hint svg {
  animation: tlSpin 6s linear infinite;
}

@keyframes tlSpin {
  to { transform: rotate(360deg); }
}

/* ---------- Card back ---------- */
.tl-back-head {
  margin: 0 0 0.7rem;
  font-family: var(--font-head);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--brand-deep);
}

.tl-stats {
  display: flex;
  flex-direction: column;
  gap: 0.68rem;
  margin: 0 0 0.8rem;
}

.stat {
  display: grid;
  grid-template-columns: minmax(86px, auto) 1fr;
  align-items: baseline;
  column-gap: 0.7rem;
}

.stat-val {
  font-family: var(--font-head);
  font-size: 1.22rem;
  font-weight: 800;
  color: var(--ink);
  white-space: nowrap;
}

.stat-label {
  font-size: 0.8rem;
  line-height: 1.4;
  color: var(--ink-soft);
}

.bar {
  grid-column: 1 / -1;
  height: 5px;
  margin-top: 0.32rem;
  border-radius: 4px;
  background: rgba(11, 31, 22, 0.08);
  overflow: hidden;
}

.bar i {
  display: block;
  width: 0;
  height: 100%;
  border-radius: 4px;
  background: var(--grad);
  transition: width 1s cubic-bezier(0.25, 0.8, 0.3, 1) 0.3s;
}

.tl-card.flipped .bar i {
  width: var(--w, 60%);
}

.tl-story {
  margin: auto 0 0;
  padding-top: 0.8rem;
  font-size: 0.84rem;
  line-height: 1.5;
  color: var(--ink-soft);
}

.tl-src {
  margin: 0.55rem 0 0;
  padding-top: 0.6rem;
  border-top: 1px dashed rgba(11, 31, 22, 0.14);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- Outro ---------- */
.tl-outro {
  padding: clamp(1.5rem, 4vw, 3rem) 0 clamp(3rem, 6vw, 4.5rem);
}

.tl-outro-panel {
  position: relative;
  overflow: hidden;
  padding: clamp(2.2rem, 5vw, 3.4rem) clamp(1.5rem, 5vw, 3.4rem);
  border-radius: 26px;
  background:
    radial-gradient(30rem 18rem at 110% -20%, rgba(45, 212, 191, 0.35), transparent 60%),
    radial-gradient(26rem 16rem at -10% 120%, rgba(52, 211, 153, 0.3), transparent 60%),
    linear-gradient(135deg, #063a2a 0%, #0b4a3a 55%, #0d5c50 100%);
  color: #d9efe4;
  box-shadow: var(--shadow-lg);
}

.tl-outro-panel h2 {
  margin-bottom: 0.5em;
  color: #ffffff;
  max-width: 30rem;
}

.tl-outro-copy {
  max-width: 38rem;
  margin: 0 0 1.9rem;
  color: #bfe3d2;
}

.tl-outro-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
  margin-bottom: 2rem;
  padding: 1.4rem 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.05);
}

.outro-val {
  display: block;
  font-family: var(--font-head);
  font-size: clamp(1.7rem, 3.4vw, 2.3rem);
  font-weight: 800;
  color: #7df0c0;
  line-height: 1.1;
}

.outro-label {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.85rem;
  line-height: 1.45;
  color: #bfe3d2;
}

.tl-outro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

/* ---------- Scroll hint ---------- */
.scroll-hint {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 1.3rem 0 0;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
}

.scroll-hint svg {
  animation: hintBob 1.8s ease-in-out infinite;
}

@keyframes hintBob {
  0%, 100% { transform: translateY(-2px); }
  50% { transform: translateY(3px); }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .tl-card { height: 404px; }
}

@media (max-width: 880px) {
  .tl-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .tl-count { text-align: left; }

  /* spine moves to the left edge */
  .tl-spine {
    left: 10px;
    transform: none;
  }

  .tl-item,
  .tl-item.right {
    width: calc(100% - 52px);
    margin: 0 0 2rem 52px;
  }

  .tl-item:not(.right) .tl-node,
  .tl-item.right .tl-node {
    left: -51.5px;
    right: auto;
  }

  .tl-era { margin-bottom: 2rem; }

  .tl-era-node { left: 10px; top: 0; transform: translate(-50%, -50%); }

  .rail-dots { margin-left: 0.9rem; margin-right: 0.9rem; overflow-x: auto; padding-bottom: 0.3rem; }
  .rail-track { margin: 0 1.4rem; }
  .rd-y { font-size: 0.68rem; }
}

@media (max-width: 560px) {
  .tl-card { height: 470px; }

  .tl-face { padding: 1.2rem 1.2rem 1.05rem; }

  .tl-face h3 { font-size: 1.16rem; }

  .tl-year { font-size: 1.65rem; }

  .tl-era-card h3 { font-size: 1.3rem; }

  .tl-outro-stats {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .rail { padding-bottom: 2.7rem; }

  .rail-eras { display: none; }

  .rail-dots { margin-left: 0.8rem; margin-right: 0.8rem; }

  .rail-dot { padding: 0.2rem 0.1rem; }

  .rail-dot .rd {
    width: 11px;
    height: 11px;
    border-width: 2px;
  }

  .rd-y {
    font-size: 0.6rem;
    letter-spacing: 0;
  }

  .stat { grid-template-columns: 1fr; row-gap: 0.1rem; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .tl-card-inner,
  .bar i,
  .rail-fill,
  .tl-node,
  .tl-era-node {
    transition: none !important;
  }

  .tl-hint svg,
  .scroll-hint svg,
  .tl-card.flash {
    animation: none !important;
  }

  .tl-card.flipped .tl-card-inner {
    transform: rotateY(180deg);
  }
}