/* ============================================================
   STF4SW — light theme, unified white background.
   Accent palette: orange + red (project highlight colours).
   ============================================================ */

:root {
  /* Surfaces — single, consistent white background everywhere */
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-2: #fafbfc;
  --border: rgba(15, 23, 42, 0.08);
  --border-strong: rgba(15, 23, 42, 0.18);

  /* Text */
  --text: #0f172a;
  --text-dim: #475569;
  --text-faint: #94a3b8;

  /* Accents — orange + red */
  --orange: #ff7a1a;
  --orange-2: #ffae5b;
  --red: #e63946;
  --red-2: #ff5a5f;
  --orange-soft: rgba(255, 122, 26, 0.10);
  --red-soft: rgba(230, 57, 70, 0.10);
  --warm-grad: linear-gradient(135deg, var(--red) 0%, var(--orange) 100%);

  /* Effects */
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 12px 36px rgba(15, 23, 42, 0.08);
  --shadow-soft: 0 4px 18px rgba(15, 23, 42, 0.06);
  --shadow-warm: 0 10px 30px rgba(230, 57, 70, 0.18);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Space Grotesk', var(--font-sans);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.15;
  margin: 0 0 0.6em;
}
h1 { font-size: clamp(2.2rem, 4.6vw, 3.8rem); }
h2 { font-size: clamp(1.8rem, 3.2vw, 2.6rem); }
h3 { font-size: 1.2rem; }
h4 {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--red);
}

p { margin: 0 0 1em; color: var(--text-dim); }
strong { color: var(--text); font-weight: 600; }

.accent {
  color: var(--orange);
  font-weight: 600;
}
.accent-strong {
  color: var(--red);
  font-weight: 700;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

.eyebrow {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--red);
  padding: 6px 14px;
  background: var(--red-soft);
  border-radius: 100px;
  margin-bottom: 18px;
}

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 10px 18px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: 100px;
  box-shadow: var(--shadow-soft);
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.04em;
  font-size: 0.95rem;
  color: var(--text);
}
.nav__brand img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  object-fit: cover;
}
.nav__links {
  display: flex;
  gap: 22px;
  font-size: 0.9rem;
  color: var(--text-dim);
}
.nav__links a { transition: color 0.2s; position: relative; }
.nav__links a:hover { color: var(--red); }
.nav__links a.nav__active { color: var(--red); font-weight: 600; }
.nav__links a.nav__active::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px;
  background: var(--warm-grad);
  border-radius: 2px;
}

/* ============================================================
   HERO — full-bleed image as low-opacity background
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 140px 32px 80px;
  overflow: hidden;
}
.hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0.22;
  filter: saturate(1.1) blur(2px);
  z-index: 0;
  pointer-events: none;
  will-change: transform;
}
.hero__bg-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    radial-gradient(1200px 700px at 25% 45%, rgba(255, 255, 255, 0.92) 0%, rgba(255, 255, 255, 0.65) 45%, rgba(255, 255, 255, 0.25) 100%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.7) 0%, rgba(255, 255, 255, 0.1) 35%, rgba(255, 255, 255, 0.95) 100%);
  pointer-events: none;
}
.hero__inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
}
.hero__left { max-width: 720px; }
.hero__logo {
  width: 96px;
  height: 96px;
  border-radius: 20px;
  object-fit: cover;
  margin-bottom: 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.hero__abbr {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(4rem, 9vw, 7rem);
  letter-spacing: -0.03em;
  background: var(--warm-grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 0.95;
  margin-bottom: 16px;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
}
.hero__title {
  font-size: clamp(1.6rem, 2.8vw, 2.4rem);
  color: var(--text);
  font-weight: 600;
  margin-bottom: 18px;
  max-width: 620px;
}
.hero__subtitle {
  font-size: 1.15rem;
  color: var(--text-dim);
  margin-bottom: 22px;
  max-width: 620px;
}
.hero__meta {
  font-size: 0.85rem;
  color: var(--text-faint);
  letter-spacing: 0.04em;
  border-top: 1px solid var(--border);
  padding-top: 16px;
  margin-bottom: 32px;
  max-width: 620px;
}
.hero__scroll {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  background: var(--warm-grad);
  border-radius: 100px;
  font-size: 0.95rem;
  font-weight: 600;
  color: white;
  box-shadow: var(--shadow-warm);
  transition: transform 0.2s, box-shadow 0.2s;
}
.hero__scroll:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 36px rgba(230, 57, 70, 0.28);
}
.hero__scroll-arrow {
  display: inline-block;
  animation: bounce 2s infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(4px); }
}

/* ============================================================
   PROJECT SUMMARY
   ============================================================ */
.project {
  padding: 120px 0;
}
.project h2 {
  max-width: 800px;
  margin-bottom: 42px;
}
.project__grid {
  max-width: 760px;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-dim);
}
.project__grid p { margin-bottom: 1.4em; }
.project__grid strong { color: var(--red); }

/* ============================================================
   TIMELINE
   ============================================================ */
.timeline {
  padding: 80px 0 0;
  position: relative;
}
.timeline__head {
  text-align: center;
  margin-bottom: 60px;
}
.timeline__head h2 { max-width: 760px; margin-left: auto; margin-right: auto; }
.timeline__lead {
  max-width: 620px;
  margin: 0 auto;
  color: var(--text-dim);
}

.timeline__stage {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

/* The vertical rail */
.timeline__rail {
  position: absolute;
  top: 0;
  left: calc(32px + 60px);
  bottom: 0;
  width: 3px;
  background: rgba(15, 23, 42, 0.08);
  border-radius: 3px;
}
.timeline__rail-fill {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0%;
  background: var(--warm-grad);
  border-radius: 3px;
  box-shadow: 0 0 12px rgba(230, 57, 70, 0.4);
}

/* Today marker — big arrow on the rail */
.timeline__today {
  position: absolute;
  left: calc(32px + 60px);
  transform: translate(-50%, -50%);
  z-index: 5;
  pointer-events: none;
  display: flex;
  align-items: center;
  gap: 10px;
}
.timeline__today-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--red);
  border: 3px solid white;
  box-shadow: 0 0 0 3px var(--red), 0 0 20px rgba(230, 57, 70, 0.6);
  position: relative;
  flex-shrink: 0;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 3px var(--red), 0 0 20px rgba(230, 57, 70, 0.5); }
  50% { box-shadow: 0 0 0 3px var(--red), 0 0 28px rgba(230, 57, 70, 0.9); }
}
.timeline__today-arrow {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: white;
  background: var(--warm-grad);
  padding: 6px 14px 6px 18px;
  border-radius: 100px 100px 100px 4px;
  box-shadow: var(--shadow-warm);
  white-space: nowrap;
  position: relative;
  margin-left: 14px;
}
.timeline__today-arrow::before {
  content: '';
  position: absolute;
  left: -8px;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  border-right: 10px solid var(--red);
}

/* Month markers */
.timeline__months {
  position: absolute;
  top: 0;
  left: 32px;
  bottom: 0;
  width: 60px;
  pointer-events: none;
}
.month-marker {
  position: absolute;
  left: 0;
  transform: translateY(-50%);
  font-family: var(--font-display);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  white-space: nowrap;
  transition: color 0.2s;
}
.month-marker--active { color: var(--red); font-weight: 700; }

/* WP container */
.timeline__wps {
  margin-left: 110px;
  display: flex;
  flex-direction: column;
  gap: 80px;
  position: relative;
}

/* Single WP card */
.wp {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 36px 28px;
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  transition: box-shadow 0.3s, transform 0.3s;
}
.wp:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}
.wp::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  height: 5px;
  width: 100%;
  background: var(--warm-grad);
}
.wp__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.04;
  pointer-events: none;
  z-index: 0;
}
.wp > * { position: relative; z-index: 1; }

.wp__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 8px;
}
.wp__id {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  color: var(--red);
  font-weight: 700;
}
.wp__title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 600;
  margin: 4px 0 8px;
  letter-spacing: -0.01em;
  color: var(--text);
}
.wp__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 18px;
}
.wp__meta-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.wp__lead {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--warm-grad);
  color: white;
  padding: 7px 14px;
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  box-shadow: var(--shadow-warm);
}
.wp__lead img {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  object-fit: contain;
  background: white;
  padding: 1px;
}
.wp__period {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.78rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 7px 14px;
  border-radius: 100px;
  color: var(--text-dim);
  letter-spacing: 0.04em;
}
.wp__desc {
  margin: 6px 0 22px;
  max-width: 720px;
  color: var(--text-dim);
}

/* Tasks */
.tasks {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 16px;
}
.task {
  display: grid;
  grid-template-columns: 80px 1fr auto;
  align-items: center;
  gap: 18px;
  padding: 16px 20px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s, transform 0.2s, background 0.2s;
}
.task:hover {
  border-color: var(--orange);
  background: white;
  transform: translateX(4px);
}
.task__code {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: 0.04em;
}
.task__main { min-width: 0; }
.task__title {
  font-size: 0.98rem;
  color: var(--text);
  font-weight: 500;
  margin-bottom: 8px;
}
.task__partners {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}
.partner-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px 3px 4px;
  background: white;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.72rem;
  color: var(--text-dim);
  font-weight: 500;
}
.partner-chip img {
  width: 16px;
  height: 16px;
  border-radius: 3px;
  object-fit: contain;
  background: white;
  padding: 1px;
}
.partner-chip--lead {
  background: var(--warm-grad);
  color: white;
  border-color: transparent;
  font-weight: 700;
  box-shadow: 0 4px 10px rgba(230, 57, 70, 0.18);
}
.partner-chip--lead img { background: white; }

.task__period {
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  white-space: nowrap;
  background: white;
  border: 1px solid var(--border);
  padding: 5px 10px;
  border-radius: 100px;
}

.task--upcoming .task__code,
.task--upcoming .task__title { opacity: 0.7; }

/* WP4 — runs full timeline (still warm-tone, but slightly differentiated) */
.wp--band::before { background: linear-gradient(90deg, var(--orange), var(--red)); }

/* Connector dot from WP card to rail */
.wp::after {
  content: '';
  position: absolute;
  left: -52px;
  top: 50px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--red);
  border: 3px solid white;
  box-shadow: 0 0 0 2px var(--red), 0 0 16px rgba(230, 57, 70, 0.45);
}

/* ============================================================
   PARTNERS
   ============================================================ */
.partners {
  padding: 140px 0 100px;
}
.partners__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 22px;
  margin-top: 50px;
}
.partner-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.partner-card:hover {
  border-color: var(--orange);
  transform: translateY(-4px);
  box-shadow: var(--shadow-warm);
}
.partner-card__logo {
  height: 64px;
  display: flex;
  align-items: center;
  margin-bottom: 18px;
}
.partner-card__logo img {
  max-height: 64px;
  max-width: 100%;
  object-fit: contain;
  background: white;
  padding: 6px;
  border-radius: 8px;
}
.partner-card__short {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--text);
  letter-spacing: -0.01em;
}
.partner-card__long {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin: 4px 0 8px;
}
.partner-card__country {
  display: inline-block;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 14px;
}
.partner-card__role {
  font-size: 0.85rem;
  color: var(--orange);
  font-weight: 600;
  border-top: 1px solid var(--border);
  padding-top: 12px;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--surface-2);
  border-top: 1px solid var(--border);
  padding: 60px 0 30px;
  margin-top: 60px;
}
.footer__top {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 40px;
}
.footer__logo {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  object-fit: cover;
  border: 1px solid var(--border);
}
.footer__title strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.4rem;
  letter-spacing: -0.01em;
  color: var(--text);
}
.footer__title span {
  display: block;
  color: var(--text-dim);
  font-size: 0.92rem;
  margin-top: 4px;
}
.footer__cols {
  display: grid;
  grid-template-columns: 2fr 1.2fr 1fr;
  gap: 40px;
  padding: 32px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.footer__cols h4 { color: var(--red); margin-bottom: 8px; }
.footer__cols p { font-size: 0.92rem; color: var(--text-dim); }
.footer__bottom {
  display: flex;
  justify-content: space-between;
  margin-top: 24px;
  font-size: 0.82rem;
  color: var(--text-faint);
  letter-spacing: 0.04em;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 960px) {
  .hero { padding: 130px 24px 60px; min-height: auto; }
  .hero__bg { opacity: 0.12; }

  .nav { padding: 8px 14px; gap: 16px; }
  .nav__links { gap: 14px; font-size: 0.82rem; }

  .footer__cols { grid-template-columns: 1fr; gap: 24px; }
}

@media (max-width: 720px) {
  .container { padding: 0 20px; }
  .timeline__stage { padding: 0 20px; }

  .timeline__rail { left: calc(20px + 24px); }
  .timeline__today { left: calc(20px + 24px); }
  .timeline__months { left: 20px; width: 30px; }
  .month-marker { font-size: 0.62rem; }
  .timeline__wps { margin-left: 60px; }

  .wp { padding: 24px 20px 20px; }
  .wp__title { font-size: 1.3rem; }
  .wp::after { left: -40px; top: 36px; width: 12px; height: 12px; }

  .task {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .task__period { justify-self: start; }
  .task__code { font-size: 0.85rem; }

  .nav__brand span { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}

/* ============================================================
   SIMULATION — interactive response spectrum calculator
   ============================================================ */
.simulation {
  padding: 120px 0 100px;
}
.simulation h2 {
  max-width: 760px;
  margin-bottom: 24px;
}
.simulation__lead {
  max-width: 720px;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-dim);
  margin-bottom: 40px;
}

.sim__panel {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 18px 22px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 28px;
  box-shadow: var(--shadow-soft);
  margin-bottom: 28px;
}
.sim__field {
  grid-column: span 4;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}
.sim__field--records { grid-column: span 12; }
.sim__field--toggles { grid-column: span 6; flex-direction: column; gap: 8px; }
.sim__field--actions {
  grid-column: span 6;
  flex-direction: row;
  align-items: end;
  justify-content: flex-end;
  gap: 10px;
}
.sim__field label {
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  font-weight: 600;
}
.sim__field input[type="number"],
.sim__field input[type="text"],
.sim__field select {
  width: 100%;
  padding: 10px 12px;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.sim__field input[readonly] {
  background: var(--surface-2);
  color: var(--text-dim);
}
.sim__field input:focus,
.sim__field select:focus {
  outline: none;
  border-color: var(--orange);
  box-shadow: 0 0 0 3px var(--orange-soft);
}
.sim__records {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px 16px;
  margin-bottom: 10px;
}
.sim__record-item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 10px;
  background: white;
  border: 1px solid var(--border);
  border-radius: 100px;
  cursor: pointer;
  font-size: 0.88rem;
  color: var(--text-dim);
  transition: border-color 0.15s, background 0.15s;
  text-transform: none;
  letter-spacing: 0;
  font-family: var(--font-sans);
  font-weight: 500;
}
.sim__record-item:hover { border-color: var(--orange); }
.sim__record-item input[type=checkbox] {
  margin: 0;
  width: 14px;
  height: 14px;
  accent-color: var(--rec-color, var(--orange));
}
.sim__record-item:has(input:checked) {
  background: var(--orange-soft);
  border-color: var(--orange);
  color: var(--text);
}
.sim__record-swatch {
  display: inline-block;
  width: 14px;
  height: 3px;
  border-radius: 2px;
  background: var(--rec-color, var(--orange));
}
.sim__record-actions {
  display: flex;
  gap: 8px;
}
.sim__chip-btn {
  background: white;
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 5px 12px;
  font-family: var(--font-display);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}
.sim__chip-btn:hover { border-color: var(--orange); color: var(--orange); }
.sim__check {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-dim);
  cursor: pointer;
  text-transform: none;
  letter-spacing: 0;
  font-family: var(--font-sans);
  font-weight: 500;
}
.sim__check input { accent-color: var(--orange); width: 16px; height: 16px; }

#sim-run {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--warm-grad);
  border-radius: 100px;
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 600;
  color: white;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-warm);
  transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s;
}
#sim-run:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 14px 36px rgba(230, 57, 70, 0.28);
}
#sim-run:disabled { opacity: 0.6; cursor: wait; }

#sim-export {
  display: inline-flex;
  align-items: center;
  padding: 10px 18px;
  background: white;
  border: 1px solid var(--border-strong);
  border-radius: 100px;
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--text-dim);
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}
#sim-export:hover { border-color: var(--orange); color: var(--orange); }

.sim__status {
  grid-column: 1 / -1;
  font-family: var(--font-display);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  color: var(--text-dim);
  padding-top: 6px;
  border-top: 1px solid var(--border);
  min-height: 1.4em;
}
.sim__status[data-kind="ok"]    { color: var(--text); }
.sim__status[data-kind="error"] { color: var(--red); }

.sim__plots {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: 240px 360px;
  gap: 22px;
}
.sim__plot {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow-soft);
  min-width: 0;
}
.sim__plot--wide {
  grid-column: 1 / -1;
}

.sim__iframe-wrap {
  position: relative;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  margin-bottom: 28px;
}
.sim__iframe-bar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 16px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}
.sim__iframe-title {
  color: var(--text);
  font-weight: 700;
}
.sim__iframe-meta {
  color: var(--text-faint);
  flex: 1;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.7rem;
}
.sim__iframe-open {
  color: var(--orange);
  font-weight: 600;
  letter-spacing: 0.04em;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s, color 0.15s;
}
.sim__iframe-open:hover {
  color: var(--red);
  border-bottom-color: var(--red);
}
.sim__iframe {
  display: block;
  width: 100%;
  height: 880px;
  border: 0;
  background: #e8ecf3;
}
.sim__iframe-mobile {
  display: none;
  padding: 40px 28px;
  text-align: center;
  color: var(--text-dim);
}
.sim__iframe-mobile p {
  margin: 0 0 18px;
  color: var(--text-dim);
  font-size: 0.95rem;
}
.sim__iframe-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  background: var(--warm-grad);
  border-radius: 100px;
  color: white;
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: var(--shadow-warm);
  transition: transform 0.15s;
}
.sim__iframe-cta:hover { transform: translateY(-1px); }

@media (max-width: 960px) {
  .sim__iframe { display: none; }
  .sim__iframe-mobile { display: block; }
  .sim__iframe-bar { display: none; }
}

.sim__notes {
  margin-top: 22px;
  font-size: 0.85rem;
  color: var(--text-faint);
  letter-spacing: 0.02em;
  max-width: 800px;
}
.sim__notes a { color: var(--orange); border-bottom: 1px solid transparent; transition: border-color 0.15s; }
.sim__notes a:hover { border-bottom-color: var(--orange); }

/* ============================================================
   EXPLORE STRIP — homepage CTA cards to sub-pages
   ============================================================ */
.explore {
  padding: 80px 0 100px;
}
.explore__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.explore__card {
  display: block;
  position: relative;
  padding: 38px 36px 32px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.explore__card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  height: 5px;
  width: 100%;
  background: var(--warm-grad);
}
.explore__card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-warm);
  border-color: var(--orange);
}
.explore__num {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--red);
  margin-bottom: 12px;
}
.explore__title {
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
  margin: 0 0 12px;
}
.explore__desc {
  color: var(--text-dim);
  font-size: 1rem;
  line-height: 1.65;
  margin-bottom: 20px;
}
.explore__cta {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--orange);
  padding-bottom: 2px;
  border-bottom: 1px solid var(--orange);
}
.explore__card:hover .explore__cta { color: var(--red); border-bottom-color: var(--red); }

@media (max-width: 720px) {
  .explore__grid { grid-template-columns: 1fr; }
  .explore { padding: 60px 0 80px; }
}

/* ============================================================
   PAGE HERO — used by simulations.html / dissemination.html
   ============================================================ */
.page-hero {
  padding: 140px 0 60px;
  background: linear-gradient(180deg, var(--surface-2) 0%, var(--surface) 100%);
  border-bottom: 1px solid var(--border);
}
.page-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.2vw, 3.4rem);
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.1;
  margin: 0 0 22px;
  max-width: 880px;
}
.page-hero__lead {
  max-width: 760px;
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-dim);
}

/* ============================================================
   SIMTABS — tabbed interface for the simulations page
   ============================================================ */
.simtabs-section { padding: 60px 0 100px; }

.simtabs { margin-bottom: 28px; }

.simtab-bar {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 28px;
}
.simtab-btn {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  cursor: pointer;
  font-family: inherit;
  text-align: left;
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s, background 0.15s;
  position: relative;
  overflow: hidden;
}
.simtab-btn:hover { border-color: var(--orange); transform: translateY(-1px); }
.simtab-btn--active {
  border-color: var(--orange);
  background: white;
  box-shadow: var(--shadow);
}
.simtab-btn--active::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  height: 4px; width: 100%;
  background: var(--warm-grad);
}
.simtab-btn__num {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--text-faint);
  margin-top: 4px;
  flex-shrink: 0;
}
.simtab-btn--active .simtab-btn__num { color: var(--red); }
.simtab-btn__body { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.simtab-btn__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text);
  letter-spacing: -0.005em;
}
.simtab-btn__sub {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.4;
}

/* Inactive panes are hidden via visibility + position so the iframes still
   compute layout (avoids a known display:none-iframe quirk where content
   collapses to 0×0 in some browsers and never recovers on reveal). */
.simtabs { position: relative; }
.simtab-pane {
  position: absolute;
  top: 0; left: 0; right: 0;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease;
}
.simtab-pane--active {
  position: relative;
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
}

@media (max-width: 720px) {
  .simtab-bar { grid-template-columns: 1fr; }
  .simtabs-section { padding: 40px 0 80px; }
}

/* ============================================================
   DISSEMINATION — publications / patents / software / conferences / news
   ============================================================ */
.diss-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 56px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
}
.diss-main { min-width: 0; }
.diss-section {
  padding: 60px 0;
  scroll-margin-top: 90px;
  border-top: 1px solid var(--border);
}
.diss-section:first-child { border-top: none; padding-top: 80px; }
.diss-section:last-child  { padding-bottom: 90px; }

/* Side nav — sticky scrollspy */
.diss-nav {
  position: sticky;
  top: 100px;
  align-self: start;
  padding-top: 80px;
  font-family: var(--font-display);
}
.diss-nav__label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 14px;
  padding-left: 14px;
}
.diss-nav__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-left: 2px solid var(--border);
}
.diss-nav__link {
  display: grid;
  grid-template-columns: 26px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  margin-left: -2px;
  border-left: 2px solid transparent;
  color: var(--text-dim);
  font-size: 0.88rem;
  font-weight: 500;
  font-family: var(--font-sans);
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}
.diss-nav__link:hover {
  color: var(--text);
  background: var(--surface-2);
}
.diss-nav__link--active {
  color: var(--text);
  background: var(--orange-soft);
  border-left-color: var(--orange);
}
.diss-nav__num {
  font-family: var(--font-display);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-faint);
}
.diss-nav__link--active .diss-nav__num { color: var(--red); }
.diss-nav__title { font-weight: 500; }
.diss-nav__link--active .diss-nav__title { font-weight: 600; }
.diss-nav__count {
  font-family: var(--font-mono, ui-monospace, SFMono-Regular, Menlo, monospace);
  font-size: 0.72rem;
  color: var(--text-faint);
  background: white;
  border: 1px solid var(--border);
  padding: 2px 8px;
  border-radius: 100px;
  min-width: 28px;
  text-align: center;
  font-weight: 600;
}
.diss-nav__link--active .diss-nav__count {
  border-color: var(--orange);
  color: var(--orange);
}

.diss-section__head { margin-bottom: 36px; max-width: 760px; }
.diss-section__head h2 { margin-bottom: 12px; }
.diss-section__lead {
  font-size: 1rem;
  color: var(--text-dim);
  line-height: 1.6;
}

.diss-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 22px;
}
.diss-grid--news { grid-template-columns: repeat(auto-fill, minmax(380px, 1fr)); }

.diss-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: var(--shadow-soft);
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}
.diss-card:hover {
  border-color: var(--orange);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.diss-card--news {
  flex-direction: column;
  padding: 0;
  overflow: hidden;
}
.diss-card__image {
  width: 100%;
  height: 160px;
  background-size: cover;
  background-position: center;
  background-color: var(--surface-2);
}
.diss-card--news .diss-card__body { padding: 18px 22px 22px; }

.diss-tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 100px;
  margin-bottom: 12px;
  align-self: flex-start;
}
.diss-tag--journal  { color: var(--red);     background: var(--red-soft); }
.diss-tag--conf     { color: var(--orange);  background: var(--orange-soft); }
.diss-tag--patent   { color: var(--text);    background: rgba(15, 23, 42, 0.06); }
.diss-tag--talk     { color: var(--orange);  background: var(--orange-soft); }
.diss-tag--news     { color: var(--red);     background: var(--red-soft); }
.diss-tag--software { color: white;          background: var(--warm-grad); }

.diss-card__title {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text);
  margin: 0 0 8px;
  letter-spacing: -0.005em;
}
.diss-card__meta {
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 6px;
  line-height: 1.5;
}
.diss-card__venue {
  font-size: 0.85rem;
  color: var(--text-faint);
  margin-bottom: 12px;
  line-height: 1.5;
}
.diss-card__summary {
  font-size: 0.92rem;
  color: var(--text-dim);
  line-height: 1.6;
  margin-bottom: 12px;
}
.diss-card__link {
  margin-top: auto;
  align-self: flex-start;
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--orange);
  padding-bottom: 1px;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s, color 0.15s;
}
.diss-card__link:hover { color: var(--red); border-bottom-color: var(--red); }

/* Software card extras — multiple action links + collapsible citation.
   Full-width cards: software entries deserve room for description, citation
   and 3 action links without competing with adjacent cards. */
.diss-card--software { grid-column: 1 / -1; }
.diss-card__links {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 16px 22px;
  padding-top: 6px;
}
.diss-cite {
  margin: 8px 0 14px;
  font-size: 0.85rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  padding-top: 12px;
}
.diss-cite summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  list-style: none;
  outline: none;
  transition: color 0.15s;
}
.diss-cite summary::-webkit-details-marker { display: none; }
.diss-cite summary::after { content: ' ▾'; }
.diss-cite[open] summary::after { content: ' ▴'; }
.diss-cite summary:hover { color: var(--orange); }
.diss-cite p {
  margin: 8px 0 0;
  font-family: var(--font-sans);
  font-size: 0.86rem;
  line-height: 1.55;
  color: var(--text-dim);
}
.diss-cite a { color: var(--orange); }
.diss-cite a:hover { border-bottom: 1px solid var(--orange); }

@media (max-width: 720px) {
  .diss-card--software { grid-column: span 1; }
  .diss-card__links { gap: 12px; }
}

.diss-empty {
  grid-column: 1 / -1;
  padding: 32px 28px;
  background: var(--surface);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  text-align: center;
}
.diss-empty p {
  margin: 0;
  color: var(--text-faint);
  font-size: 0.95rem;
}
.diss-empty__icon {
  display: block;
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-faint);
  margin-bottom: 4px;
  letter-spacing: 0.3em;
}

/* Side-nav collapses to a horizontal sticky pill bar on narrower viewports */
@media (max-width: 1024px) {
  .diss-layout {
    grid-template-columns: 1fr;
    gap: 0;
    overflow-x: hidden;   /* clip the nav's full-bleed negative margin */
  }
  .diss-nav {
    position: sticky;
    top: 70px;
    z-index: 5;
    padding: 12px 0;
    margin: 0 -32px 8px;
    background: rgba(255, 255, 255, 0.94);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
  }
  .diss-nav__label { display: none; }
  .diss-nav__list {
    flex-direction: row;
    border-left: none;
    overflow-x: auto;
    padding: 0 32px;
    gap: 8px;
    scrollbar-width: none;
  }
  .diss-nav__list::-webkit-scrollbar { display: none; }
  .diss-nav__link {
    flex-shrink: 0;
    margin-left: 0;
    border-left: none;
    border-radius: 100px;
    padding: 7px 14px;
    grid-template-columns: auto auto auto;
    gap: 6px;
    border: 1px solid var(--border);
    background: white;
  }
  .diss-nav__link--active {
    background: var(--orange-soft);
    border-color: var(--orange);
  }
  .diss-section { padding: 50px 0; scroll-margin-top: 130px; }
  .diss-section:first-child { padding-top: 30px; }
}

@media (max-width: 720px) {
  .diss-section { padding: 40px 0; }
  .diss-section__head { margin-bottom: 24px; }
  .diss-nav__num { display: none; }  /* compact pills on mobile */
  .diss-nav__link {
    grid-template-columns: auto auto;
    padding: 6px 12px;
    font-size: 0.84rem;
  }
}

.sim__downloads {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: stretch;
}
.sim__downloads-label {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--text-faint);
  font-weight: 700;
  margin-right: 8px;
}
.sim__dl {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px 10px 14px;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
  min-width: 0;
}
.sim__dl:hover {
  border-color: var(--orange);
  transform: translateY(-1px);
  box-shadow: var(--shadow-soft);
}
.sim__dl-icon {
  font-size: 1.1rem;
  line-height: 1;
  flex-shrink: 0;
}
.sim__dl-body {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.sim__dl-title {
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.005em;
}
.sim__dl-meta {
  font-size: 0.72rem;
  color: var(--text-faint);
  letter-spacing: 0.04em;
}

@media (max-width: 960px) {
  .sim__panel { grid-template-columns: repeat(6, 1fr); }
  .sim__field, .sim__field--records, .sim__field--toggles,
  .sim__field--actions { grid-column: span 6; }
  .sim__field--actions { justify-content: flex-start; }
  .sim__plots {
    grid-template-columns: 1fr;
    grid-template-rows: 240px repeat(3, 320px);
  }
}

@media (max-width: 720px) {
  .simulation { padding: 80px 0 60px; }
  .sim__panel { padding: 20px; gap: 14px; }
  .sim__records { grid-template-columns: 1fr; }
  #sim-run, #sim-export { width: 100%; justify-content: center; }
  .sim__field--actions { flex-direction: column; align-items: stretch; }
}