/* ============ KFDN — design tokens ============ */
:root {
  --navy-950: #081A30;
  --navy-900: #0C2544;
  --navy-800: #123663;
  --blue-600: #1B5AA8;
  --blue-500: #2E77C8;
  --green-600: #3F7A2E;
  --green-500: #55993F;
  --ink: #1C2735;
  --ink-2: #46586C;
  --muted: #6B7A8D;
  --paper: #FFFFFF;
  --stone-50: #F5F6F4;
  --stone-100: #ECEEEA;
  --line: #E2E6E1;
  --dot-teal: #16A3A0;
  --dot-orange: #F2A33C;
  --dot-pink: #E8467C;
  --dot-blue: #2E77C8;
  --dot-green: #567D2E;
  --chart-comp: #ED7D31;
  --radius: 14px;
  --font-display: "Sora", "Avenir Next", "Century Gothic", "Segoe UI", sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.15; }

/* ============ shared ============ */
.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; }
.section-tint { background: var(--stone-50); }
.section-dark { background: linear-gradient(160deg, var(--navy-950), var(--navy-800)); color: #E9F0F8; }
.section-dark h2, .section-dark h3, .section-dark h4 { color: #fff; }

.section-head { max-width: 720px; margin: 0 auto 56px; text-align: center; }
.section-head h2 { font-size: clamp(1.9rem, 3.6vw, 2.6rem); font-weight: 700; letter-spacing: -0.01em; }
.section-head p { margin-top: 18px; font-size: 1.06rem; color: var(--ink-2); }
.section-dark .section-head p { color: #B9CCE2; }

.dots { display: flex; gap: 9px; justify-content: center; margin-top: 16px; }
.dots i { width: 9px; height: 9px; border-radius: 50%; display: inline-block; }
.dots i:nth-child(1) { background: var(--dot-teal); }
.dots i:nth-child(2) { background: var(--dot-orange); }
.dots i:nth-child(3) { background: var(--dot-pink); }
.dots i:nth-child(4) { background: var(--dot-blue); }
.dots i:nth-child(5) { background: var(--dot-green); }

.btn {
  display: inline-block; padding: 13px 26px; border-radius: 999px;
  font-family: var(--font-display); font-weight: 600; font-size: 0.95rem;
  text-decoration: none; transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--green-500); color: #fff; box-shadow: 0 6px 18px rgba(85, 153, 63, 0.35); }
.btn-primary:hover { background: var(--green-600); }
.btn-ghost { border: 1.5px solid rgba(255,255,255,0.55); color: #fff; }
.btn-ghost:hover { border-color: #fff; background: rgba(255,255,255,0.08); }

/* reveal on scroll */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ============ nav ============ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background 0.25s ease, box-shadow 0.25s ease;
}
.nav.scrolled { background: rgba(8, 26, 48, 0.92); backdrop-filter: blur(10px); box-shadow: 0 2px 18px rgba(0,0,0,0.25); }
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; gap: 28px;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand img { height: 30px; width: auto; }
.brand span { font-family: var(--font-display); font-weight: 800; font-size: 1.35rem; color: #fff; letter-spacing: 0.02em; }
.nav-links { display: flex; gap: 22px; margin-left: auto; }
.nav-links a {
  color: rgba(255,255,255,0.85); text-decoration: none; font-size: 0.92rem; font-weight: 500;
  transition: color 0.15s ease; white-space: nowrap;
}
.nav-links a:hover { color: #fff; }
.btn-nav { background: var(--green-500); color: #fff; padding: 9px 20px; font-size: 0.88rem; }
.btn-nav:hover { background: var(--green-600); }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: #fff; margin: 5px 0; border-radius: 2px; transition: 0.2s; }

/* ============ hero ============ */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(155deg, var(--navy-950) 0%, var(--navy-900) 55%, var(--navy-800) 100%);
  color: #fff; padding: 150px 0 0;
}
.hero-bg {
  position: absolute; inset: 0; opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='56' height='97' viewBox='0 0 56 97'%3E%3Cpath d='M28 0L56 16.2v32.3L28 64.7 0 48.5V16.2z M28 64.7L56 80.8V97H0V80.8z' fill='none' stroke='%232E77C8' stroke-opacity='0.16' stroke-width='1'/%3E%3C/svg%3E");
}
.hero-inner {
  position: relative; max-width: 1140px; margin: 0 auto; padding: 0 24px;
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 40px; align-items: center;
}
.eyebrow {
  font-family: var(--font-display); font-size: 0.82rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.14em; color: #7FB2E8; margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.7rem); font-weight: 800; letter-spacing: -0.02em;
}
.hero h1 em { font-style: normal; color: #7FE07A;
  background: linear-gradient(90deg, #8FE578, #4FC7A2); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.lead { margin-top: 22px; font-size: 1.12rem; color: #C4D5E8; max-width: 540px; }
.hero-cta { margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap; }

/* hex collage */
.hero-hexes { position: relative; height: 420px; }
.hex {
  position: absolute; width: 190px; height: 214px;
  clip-path: polygon(50% 0, 100% 25%, 100% 75%, 50% 100%, 0 75%, 0 25%);
  background-size: cover; background-position: center;
}
.hex-a { top: 0; left: 22%; }
.hex-b { top: 112px; left: 55%; }
.hex-c { top: 224px; left: 22%; }
.hex-d { top: 112px; left: -11%; background: linear-gradient(160deg, rgba(46,119,200,0.5), rgba(85,153,63,0.4)); }

/* pillars */
.pillars {
  position: relative; max-width: 1140px; margin: 72px auto 0; padding: 0 24px 0;
  display: grid; grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid rgba(255,255,255,0.14);
}
.pillar { padding: 30px 28px 42px; border-left: 1px solid rgba(255,255,255,0.14); }
.pillar:first-child { border-left: none; padding-left: 0; }
.pillar h3 {
  font-size: 1.02rem; text-transform: uppercase; letter-spacing: 0.12em; color: #7FB2E8; margin-bottom: 8px;
}
.pillar p { color: #C4D5E8; font-size: 0.98rem; }

/* ============ stats band ============ */
.stats { background: var(--navy-950); color: #fff; border-top: 1px solid rgba(255,255,255,0.08); }
.stats-inner {
  max-width: 1140px; margin: 0 auto; padding: 46px 24px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px;
}
.stat { text-align: center; }
.stat-num {
  display: block; font-family: var(--font-display); font-weight: 800;
  font-size: clamp(2rem, 3.6vw, 2.9rem); color: #8FE578;
}
.stat-label { display: block; margin-top: 6px; font-size: 0.9rem; color: #AFC6DE; }

/* ============ pledge cards ============ */
.pledge-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 24px; transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.card:hover { box-shadow: 0 14px 34px rgba(12, 37, 68, 0.1); transform: translateY(-4px); }
.card-icon { font-size: 1.1rem; color: var(--tint); margin-bottom: 14px; }
.card h3 { font-size: 1.08rem; margin-bottom: 10px; }
.card p { font-size: 0.93rem; color: var(--ink-2); }

/* timeline */
.timeline {
  margin-top: 72px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px;
  position: relative;
}
.timeline::before {
  content: ""; position: absolute; top: 7px; left: 2%; right: 2%;
  height: 2px; background: var(--stone-100);
}
.tl-item { position: relative; padding-top: 30px; }
.tl-item::before {
  content: ""; position: absolute; top: 0; left: 0;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--dot); box-shadow: 0 0 0 4px color-mix(in srgb, var(--dot) 22%, transparent);
}
.tl-era { font-family: var(--font-display); font-weight: 700; font-size: 1.25rem; color: var(--dot); }
.tl-item h4 { margin: 6px 0 8px; font-size: 1.02rem; }
.tl-item p { font-size: 0.9rem; color: var(--ink-2); }

/* ============ low carbon ============ */
.lc-grid { display: grid; grid-template-columns: 1fr 1.25fr; gap: 26px; align-items: stretch; }
.lc-challenge, .lc-solution {
  border-radius: var(--radius); padding: 34px 30px;
}
.lc-challenge { background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.12); }
.lc-solution { background: rgba(85,153,63,0.14); border: 1px solid rgba(143,229,120,0.3); }
.lc-grid h3 { font-size: 1.3rem; margin-bottom: 12px; }
.lc-grid > div > p { color: #B9CCE2; font-size: 0.97rem; }
.chip-list { list-style: none; margin-top: 20px; display: flex; flex-wrap: wrap; gap: 10px; }
.chip-list li {
  padding: 8px 16px; border-radius: 999px; font-size: 0.88rem; font-weight: 500;
  background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.18); color: #DCE7F2;
}
.sol-items { margin-top: 22px; display: grid; gap: 18px; }
.sol-item h4 { font-size: 1.02rem; color: #8FE578; margin-bottom: 4px; }
.sol-item p { font-size: 0.92rem; color: #C4D5E8; }

/* ============ capabilities ============ */
.cap-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.cap {
  border-radius: var(--radius); border: 1px solid var(--line); padding: 34px 28px;
  background: linear-gradient(170deg, var(--paper), var(--stone-50));
}
.cap-big {
  font-family: var(--font-display); font-weight: 800; font-size: 3.2rem;
  color: var(--blue-600); letter-spacing: -0.02em;
}
.cap h3 { margin: 8px 0 10px; font-size: 1.1rem; }
.cap p { font-size: 0.93rem; color: var(--ink-2); }

/* ============ projects ============ */
.proj-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.proj {
  position: relative; border-radius: var(--radius); overflow: hidden;
  aspect-ratio: 4 / 3; background: var(--stone-100);
}
.proj-wide { grid-column: span 2; }
.proj img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.proj:hover img { transform: scale(1.04); }
.proj figcaption {
  position: absolute; inset: auto 0 0 0; padding: 40px 18px 16px;
  background: linear-gradient(transparent, rgba(8,26,48,0.85));
  color: #fff;
}
.proj .tag {
  display: inline-block; font-family: var(--font-display); font-size: 0.72rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.1em; padding: 4px 10px; border-radius: 999px;
  background: var(--green-500); margin-bottom: 6px;
}
.proj figcaption p { font-size: 0.92rem; }

/* ============ grout ============ */
.grout-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.grout-adv { display: grid; gap: 8px; }
.adv {
  padding: 20px 22px; border-left: 3px solid var(--green-500);
  background: var(--stone-50); border-radius: 0 10px 10px 0; margin-bottom: 10px;
}
.adv h4 { font-size: 1rem; margin-bottom: 4px; }
.adv p { font-size: 0.92rem; color: var(--ink-2); }
.grout-photos {
  display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr; gap: 14px;
}
.grout-photos img { width: 100%; height: 100%; object-fit: cover; border-radius: 12px; }
.gp-tall { grid-row: span 2; }

/* ============ R&D / chart ============ */
.rnd-grid { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 40px; align-items: start; }
.rnd-stats { display: grid; gap: 26px; }
.rnd-stat .stat-num { color: var(--blue-600); font-size: 2.6rem; }
.rnd-stat .stat-label { color: var(--ink-2); font-size: 0.95rem; margin-top: 2px; }
.rnd-note { font-size: 0.95rem; color: var(--ink-2); border-top: 1px solid var(--line); padding-top: 20px; }

.chart-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 26px 20px;
}
.chart-title { font-size: 1.05rem; }
.chart-sub { font-size: 0.85rem; color: var(--muted); margin: 4px 0 14px; }
.chart-wrap { position: relative; }
.chart-wrap svg { width: 100%; height: auto; }
.grid line { stroke: var(--stone-100); stroke-width: 1; }
.axis-text text { fill: var(--muted); font-size: 12px; font-family: var(--font-body); }
.axis-title { font-size: 12px; }
.line { fill: none; stroke-width: 2.5; stroke-linejoin: round; stroke-linecap: round; }
.line-senroc { stroke: var(--blue-600); }
.line-comp { stroke: var(--chart-comp); }
.dashed { stroke-dasharray: 7 6; }
.crosshair { stroke: var(--muted); stroke-width: 1; stroke-dasharray: 3 3; }
.dot-senroc { fill: var(--blue-600); stroke: #fff; stroke-width: 2; }
.dot-comp { fill: var(--chart-comp); stroke: #fff; stroke-width: 2; }
.tooltip {
  position: absolute; pointer-events: none; background: var(--navy-950); color: #fff;
  border-radius: 9px; padding: 10px 13px; font-size: 0.8rem; line-height: 1.5;
  box-shadow: 0 8px 22px rgba(0,0,0,0.25); white-space: nowrap; z-index: 5;
}
.tooltip b { font-family: var(--font-display); }
.tooltip .row i {
  display: inline-block; width: 8px; height: 8px; border-radius: 2px; margin-right: 6px;
}
.legend { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 12px; font-size: 0.85rem; color: var(--ink-2); }
.legend span { display: inline-flex; align-items: center; gap: 7px; }
.sw { width: 18px; height: 3px; border-radius: 2px; display: inline-block; }
.sw-senroc { background: var(--blue-600); }
.sw-comp { background: var(--chart-comp); }
.sw-dash { background: repeating-linear-gradient(90deg, var(--chart-comp) 0 5px, transparent 5px 9px); }
.chart-data { margin-top: 14px; font-size: 0.85rem; }
.chart-data summary { cursor: pointer; color: var(--blue-600); font-weight: 500; }
.chart-data table { width: 100%; border-collapse: collapse; margin-top: 10px; }
.chart-data th, .chart-data td { padding: 7px 10px; border-bottom: 1px solid var(--line); text-align: right; }
.chart-data th:first-child, .chart-data td:first-child { text-align: left; }
.chart-data th { color: var(--ink-2); font-weight: 600; }

/* ============ contact ============ */
.contact .section-head { margin-bottom: 40px; }
.contact-grid {
  max-width: 960px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr; gap: 22px;
}
.contact-card {
  text-align: center;
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius); padding: 42px 32px;
}
.contact-name { font-family: var(--font-display); font-weight: 700; font-size: 1.5rem; display: block; }
.contact-role { color: #7FB2E8; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.12em; }
.contact-actions { margin-top: 26px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ============ footer ============ */
.footer { background: var(--navy-950); color: #AFC6DE; }
.footer-inner {
  max-width: 1140px; margin: 0 auto; padding: 54px 24px;
  display: flex; flex-direction: column; align-items: center; gap: 14px; text-align: center;
}
.footer .brand img { height: 26px; }
.footer .brand span { font-size: 1.15rem; }
.footer p { font-size: 0.9rem; }
.copyright { color: #5F7288; font-size: 0.82rem; }

/* ============ responsive ============ */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-hexes { display: none; }
  .pledge-grid, .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .timeline { grid-template-columns: repeat(2, 1fr); gap: 40px 26px; }
  .timeline::before { display: none; }
  .lc-grid, .grout-grid, .rnd-grid, .contact-grid { grid-template-columns: 1fr; }
  .cap-grid { grid-template-columns: 1fr; }
  .proj-grid { grid-template-columns: 1fr 1fr; }
  .proj-wide { grid-column: span 2; }
}
@media (max-width: 1020px) {
  .nav-links, .btn-nav { display: none; }
  .nav-toggle { display: block; margin-left: auto; }
  .nav { background: rgba(8, 26, 48, 0.92); }
  .nav.open .nav-links {
    display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0;
    background: var(--navy-950); padding: 18px 24px 26px; gap: 16px;
    box-shadow: 0 18px 30px rgba(0,0,0,0.3); border-bottom: 1px solid rgba(255,255,255,0.1);
  }
}
@media (max-width: 700px) {
  .section { padding: 68px 0; }
  .hero { padding-top: 120px; }
  .pillars { grid-template-columns: 1fr; }
  .pillar { border-left: none; padding: 18px 0; border-top: 1px solid rgba(255,255,255,0.12); }
  .pillar:first-child { border-top: none; }
  .stats-inner { grid-template-columns: 1fr 1fr; gap: 30px 16px; }
  .pledge-grid { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: 1fr; }
  .proj-grid { grid-template-columns: 1fr; }
  .proj-wide { grid-column: span 1; }
  .grout-photos { grid-template-columns: 1fr 1fr; }
}