:root {
  --green: #147a55;
  --green-deep: #0d513c;
  --green-soft: #dff1e7;
  --blue: #1e6fb7;
  --blue-deep: #164f83;
  --blue-soft: #e5f1fb;
  --aqua: #2c8e9e;
  --yellow: #f2c84b;
  --yellow-soft: #fff2bb;
  --cream: #f7f8f1;
  --paper: #fffefa;
  --ink: #173831;
  --muted: #586d67;
  --line: #dbe4df;
  --white: #ffffff;
  --shadow-sm: 0 10px 28px rgba(23, 56, 49, .08);
  --shadow-lg: 0 28px 70px rgba(23, 56, 49, .14);
  --radius-sm: 16px;
  --radius-md: 26px;
  --radius-lg: 38px;
  --header-height: 80px;
  --shell: 1560px;
  --gutter: clamp(22px, 5vw, 88px);
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 8px); }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--font-sans); font-size: 17px; line-height: 1.75; -webkit-font-smoothing: antialiased; }
body.nav-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; }
button, input, textarea, select { font: inherit; }
button { color: inherit; }
.icon { width: 1.2em; height: 1.2em; flex: 0 0 auto; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { letter-spacing: -.035em; line-height: 1.16; }
h1 { font-size: clamp(44px, 4.1vw, 76px); }
h2 { font-size: clamp(36px, 3.05vw, 56px); }
h3 { font-size: clamp(22px, 1.55vw, 29px); }
p { margin-bottom: 1em; }
code { padding: .12em .35em; border-radius: 6px; background: #edf2ef; font-size: .92em; }

.shell { width: min(100% - (var(--gutter) * 2), var(--shell)); margin-inline: auto; }
.section { padding: clamp(92px, 8vw, 154px) 0; }
.section--cream { background: var(--cream); }
.section--white { background: var(--white); }
.sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; z-index: 9999; left: 18px; top: 12px; padding: 10px 15px; border-radius: 10px; color: var(--white); background: var(--green-deep); transform: translateY(-150%); transition: transform .2s; }
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid var(--yellow); outline-offset: 4px; }

.site-header { position: sticky; z-index: 1000; top: 0; height: var(--header-height); border-bottom: 1px solid rgba(23, 56, 49, .1); background: rgba(255, 254, 250, .94); backdrop-filter: blur(16px); }
.site-header.is-scrolled { box-shadow: 0 8px 28px rgba(23, 56, 49, .08); }
.site-nav { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 34px; }
.brand { display: inline-flex; align-items: center; gap: 13px; text-decoration: none; flex: 0 0 auto; }
.brand__mark { position: relative; display: block; width: 38px; height: 38px; transform: rotate(45deg); }
.brand__mark i { position: absolute; width: 16px; height: 16px; border-radius: 15px 2px 15px 2px; }
.brand__mark i:nth-child(1) { left: 0; top: 0; background: var(--green); }
.brand__mark i:nth-child(2) { right: 0; top: 0; background: var(--blue); transform: rotate(90deg); }
.brand__mark i:nth-child(3) { right: 0; bottom: 0; background: var(--yellow); transform: rotate(180deg); }
.brand__mark i:nth-child(4) { left: 0; bottom: 0; background: #f39b3d; transform: rotate(270deg); }
.brand__text { display: grid; line-height: 1.05; }
.brand__text strong { font-size: 22px; letter-spacing: .06em; }
.brand__text small { margin-top: 6px; color: var(--muted); font-size: 9px; font-weight: 800; letter-spacing: .24em; }
.nav-panel { margin-left: auto; }
.nav-links { display: flex; align-items: center; gap: clamp(18px, 2vw, 36px); margin: 0; padding: 0; list-style: none; }
.nav-links a { position: relative; display: block; padding: 12px 0; color: #375a51; font-size: 15px; font-weight: 700; text-decoration: none; white-space: nowrap; }
.nav-links a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 5px; height: 3px; border-radius: 9px; background: var(--green); transition: right .2s ease; }
.nav-links a:hover::after, .nav-links a.is-active::after { right: 0; }
.nav-links a:hover, .nav-links a.is-active { color: var(--green-deep); }
.nav-toggle { display: none; align-items: center; justify-content: center; gap: 7px; min-width: 48px; min-height: 48px; border: 0; border-radius: 13px; background: var(--green-soft); cursor: pointer; }
.nav-toggle__close { display: none; }
.nav-toggle[aria-expanded="true"] .nav-toggle__menu { display: none; }
.nav-toggle[aria-expanded="true"] .nav-toggle__close { display: inline-block; }

.hero { position: relative; overflow: hidden; background: linear-gradient(135deg, #fbf8e9 0%, #f6f8f1 45%, #edf6f1 100%); }
.hero__wash { position: absolute; inset: 0; pointer-events: none; background: radial-gradient(circle at 8% 20%, rgba(242, 200, 75, .24) 0 9%, transparent 9.2%), radial-gradient(circle at 95% 82%, rgba(30, 111, 183, .14) 0 12%, transparent 12.2%); }
.hero__grid { position: relative; min-height: calc(100vh - var(--header-height) - 74px); display: grid; grid-template-columns: minmax(0, 1.04fr) minmax(480px, .96fr); align-items: center; gap: clamp(58px, 6vw, 112px); padding-top: clamp(70px, 7vh, 110px); padding-bottom: clamp(70px, 7vh, 110px); }
.hero__copy { max-width: 800px; }
.eyebrow, .kicker { display: inline-flex; align-items: center; gap: 10px; margin-bottom: 20px; color: var(--green); font-size: 15px; font-weight: 800; letter-spacing: .12em; }
.eyebrow__dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; background: var(--yellow); box-shadow: 0 0 0 6px rgba(242, 200, 75, .22); }
.hero h1 { max-width: 800px; margin-bottom: 28px; font-weight: 750; }
.hero h1 strong { color: var(--green); font-weight: inherit; }
.hero__lead { max-width: 760px; margin-bottom: 34px; color: #3f5c55; font-size: clamp(19px, 1.25vw, 23px); line-height: 1.8; }
.hero__actions { display: flex; align-items: center; flex-wrap: wrap; gap: 25px; margin-bottom: 48px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 11px; min-height: 54px; padding: 0 24px; border-radius: 999px; font-weight: 800; text-decoration: none; transition: transform .2s, box-shadow .2s, background .2s; }
.button--primary { color: var(--white); background: var(--green); box-shadow: 0 12px 30px rgba(20, 122, 85, .22); }
.button--primary:hover { background: var(--green-deep); transform: translateY(-2px); box-shadow: 0 15px 34px rgba(20, 122, 85, .28); }
.text-link { display: inline-flex; align-items: center; gap: 8px; color: var(--blue-deep); font-weight: 750; text-decoration: none; }
.text-link:hover { text-decoration: underline; text-underline-offset: 6px; }
.hero__facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 0; padding: 0; list-style: none; }
.hero__facts li { position: relative; min-height: 116px; padding: 20px 18px 17px 19px; border: 1px solid rgba(20, 122, 85, .16); border-radius: var(--radius-sm); background: rgba(255, 255, 255, .58); }
.hero__facts span { position: absolute; right: 14px; top: 10px; color: rgba(20, 122, 85, .22); font-size: 28px; font-weight: 900; }
.hero__fact-icon { width: 38px; height: 38px; display: grid; place-items: center; margin-bottom: 13px; border-radius: 12px; color: var(--green); background: var(--green-soft); }
.hero__fact-icon .icon { width: 21px; height: 21px; }
.hero__facts li:nth-child(2) .hero__fact-icon { color: var(--blue); background: var(--blue-soft); }
.hero__facts li:nth-child(3) .hero__fact-icon { color: #816000; background: var(--yellow-soft); }
.hero__facts strong, .hero__facts small { display: block; }
.hero__facts strong { margin-bottom: 5px; font-size: 17px; }
.hero__facts small { color: var(--muted); font-size: 13px; line-height: 1.55; }
.hero-card { position: relative; margin: 0; padding: 17px; border-radius: var(--radius-lg); background: var(--white); box-shadow: var(--shadow-lg); transform: rotate(1deg); }
.hero-card picture { display: block; overflow: hidden; aspect-ratio: 1.2 / 1; border-radius: calc(var(--radius-lg) - 11px); }
.hero-card picture img { width: 100%; height: 100%; object-fit: cover; }
.hero-card figcaption { padding: 24px 19px 14px; }
.hero-card__label { display: inline-block; margin-bottom: 9px; color: var(--blue); font-size: 13px; font-weight: 850; letter-spacing: .08em; }
.hero-card figcaption p { margin: 0; color: var(--muted); font-size: 16px; line-height: 1.65; }
.hero-card figcaption strong { color: var(--ink); }
.hero-card__badge { position: absolute; padding: 10px 15px; border: 3px solid var(--white); border-radius: 999px; font-size: 13px; font-weight: 850; box-shadow: var(--shadow-sm); }
.hero-card__badge--yellow { left: -33px; top: 40px; background: var(--yellow); transform: rotate(-6deg); }
.hero-card__badge--blue { right: -29px; bottom: 100px; color: var(--white); background: var(--blue); transform: rotate(5deg); }
.resource-ribbon { position: relative; border-top: 1px solid rgba(23, 56, 49, .08); border-bottom: 1px solid rgba(23, 56, 49, .08); background: rgba(255, 255, 255, .82); }
.resource-ribbon__inner { min-height: 74px; display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 10px 20px; }
.resource-ribbon__inner strong, .resource-ribbon__inner span { display: inline-flex; align-items: center; gap: 7px; }
.resource-ribbon__inner strong { margin-right: 7px; color: var(--green-deep); }
.resource-ribbon__inner strong .icon { width: 18px; height: 18px; color: #a77a00; }
.resource-ribbon__inner span { padding: 7px 10px; border: 1px solid rgba(20,122,85,.11); border-radius: 999px; color: #415f57; background: rgba(255,255,255,.78); font-size: 13px; font-weight: 700; }
.resource-ribbon__inner span .icon { width: 15px; height: 15px; color: var(--green); }
.resource-ribbon__inner span:nth-of-type(3n+2) .icon { color: var(--blue); }
.resource-ribbon__inner span:nth-of-type(3n) .icon { color: #9b7200; }

.section-heading { max-width: 850px; margin-bottom: clamp(48px, 5vw, 82px); }
.section-heading h2 { margin-bottom: 23px; }
.section-heading > p:last-child, .section-heading--split > p { margin-bottom: 0; color: var(--muted); font-size: clamp(18px, 1.1vw, 21px); }
.section-heading--wide { max-width: 1120px; }
.section-heading--wide > p:last-child { max-width: 900px; }
.section-heading--split { max-width: none; display: grid; grid-template-columns: 1fr .76fr; align-items: end; gap: 9vw; }
.section-heading--split h2 { margin-bottom: 0; }
.section-heading--center { margin-inline: auto; text-align: center; }
.section-heading--light { color: var(--white); }
.section-heading--light > p:last-child { color: rgba(255,255,255,.72); }
.kicker { margin-bottom: 15px; }
.kicker--blue { color: var(--blue); }
.kicker--yellow { color: var(--yellow); }

.source-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.source-card { min-height: 232px; padding: 32px; border: 1px solid rgba(23, 56, 49, .09); border-radius: var(--radius-md); background: var(--white); box-shadow: 0 12px 30px rgba(23, 56, 49, .045); }
.source-card .icon { width: 42px; height: 42px; margin-bottom: 28px; }
.source-card h3 { margin-bottom: 10px; font-size: 24px; }
.source-card p { margin: 0; color: var(--muted); font-size: 15px; }
.source-card--green .icon { color: var(--green); }
.source-card--blue .icon { color: var(--blue); }
.source-card--yellow .icon { color: #ad7e00; }
.source-card--aqua .icon { color: var(--aqua); }
.source-card--green { background: linear-gradient(145deg, #fff 55%, #ecf7f0); }
.source-card--blue { background: linear-gradient(145deg, #fff 55%, #eaf3fb); }
.source-card--yellow { background: linear-gradient(145deg, #fff 55%, #fff7d5); }
.source-card--aqua { background: linear-gradient(145deg, #fff 55%, #e7f6f7); }
.definition-note { display: grid; grid-template-columns: 88px 1fr; gap: 30px; max-width: 1210px; margin: 72px auto 0; padding: 40px 48px; border-radius: var(--radius-md); color: var(--white); background: var(--blue-deep); box-shadow: var(--shadow-lg); }
.definition-note__icon { width: 76px; height: 76px; display: grid; place-items: center; border-radius: 24px; color: var(--yellow); background: rgba(255,255,255,.12); }
.definition-note__icon .icon { width: 36px; height: 36px; }
.definition-note__label { margin-bottom: 5px; color: #a9d5f6; font-size: 14px; font-weight: 850; letter-spacing: .12em; }
.definition-note h3 { margin-bottom: 11px; font-size: 29px; }
.definition-note p:last-child { max-width: 920px; margin: 0; color: rgba(255,255,255,.76); }

.meaning-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.meaning-card { position: relative; min-height: 390px; padding: 34px 30px 30px; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--white); }
.meaning-card__number { position: absolute; right: 21px; top: 10px; color: #e6ede9; font-size: 74px; font-weight: 900; line-height: 1; }
.meaning-card__icon { position: relative; width: 66px; height: 66px; display: grid; place-items: center; margin: 50px 0 32px; border-radius: 22px; }
.meaning-card__icon .icon { width: 31px; height: 31px; }
.meaning-card__icon--green { color: var(--green); background: var(--green-soft); }
.meaning-card__icon--blue { color: var(--blue); background: var(--blue-soft); }
.meaning-card__icon--yellow { color: #947000; background: var(--yellow-soft); }
.meaning-card h3 { min-height: 62px; margin-bottom: 14px; font-size: 24px; }
.meaning-card p { margin: 0; color: var(--muted); font-size: 15px; }
.meaning-card--dark { color: var(--white); border-color: var(--green-deep); background: var(--green-deep); }
.meaning-card--dark .meaning-card__number { color: rgba(255,255,255,.1); }
.meaning-card--dark p { color: rgba(255,255,255,.74); }
.meaning-card__icon--light { color: var(--yellow); background: rgba(255,255,255,.1); }

.research-section { color: var(--white); background: var(--green-deep); }
.question-path { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin: 0; padding: 0; list-style: none; counter-reset: none; }
.question-path > li { position: relative; overflow: hidden; border: 1px solid rgba(255,255,255,.14); border-radius: var(--radius-md); background: rgba(255,255,255,.06); }
.question-path__number { position: absolute; z-index: 3; left: 20px; top: 20px; width: 46px; height: 46px; display: grid; place-items: center; border: 4px solid var(--green-deep); border-radius: 50%; color: var(--green-deep); background: var(--yellow); font-size: 18px; font-weight: 900; }
.question-path__image { position: relative; height: 255px; overflow: hidden; }
.question-path__visual-icon { position: absolute; z-index: 2; right: 18px; bottom: 18px; width: 58px; height: 58px; display: grid; place-items: center; border: 3px solid rgba(255,255,255,.82); border-radius: 20px; color: var(--green-deep); background: var(--yellow); box-shadow: 0 10px 28px rgba(0,0,0,.18); }
.question-path__visual-icon .icon { width: 29px; height: 29px; }
.question-path__image img { width: 100%; height: 100%; object-fit: cover; transition: transform .45s ease; }
.question-path > li:hover .question-path__image img { transform: scale(1.035); }
.question-path__copy { padding: 30px 30px 34px; }
.question-path__label { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 9px; color: #91d1b9; font-size: 13px; font-weight: 850; letter-spacing: .12em; }
.question-path__label .icon { width: 17px; height: 17px; }
.question-path h3 { min-height: 67px; margin-bottom: 15px; font-size: 28px; }
.question-path__copy > p:last-child { margin: 0; color: rgba(255,255,255,.72); font-size: 15px; }

.use-grid { display: grid; grid-template-columns: 1.25fr .75fr .75fr .75fr; gap: 20px; }
.use-card { min-height: 385px; padding: 30px; border-radius: var(--radius-md); }
.use-card--photo { padding: 0; overflow: hidden; color: var(--white); background: var(--green-deep); }
.use-card__image { position: relative; height: 220px; overflow: hidden; }
.use-card__photo-icon { position: absolute; z-index: 2; left: 20px; top: 20px; width: 54px; height: 54px; display: grid; place-items: center; border: 2px solid rgba(255,255,255,.72); border-radius: 18px; color: var(--green-deep); background: var(--yellow); box-shadow: 0 10px 24px rgba(0,0,0,.18); }
.use-card__photo-icon .icon { width: 27px; height: 27px; }
.use-card__image img { width: 100%; height: 100%; object-fit: cover; }
.use-card__copy { padding: 26px 30px 30px; }
.use-card__copy p { color: rgba(255,255,255,.72); }
.use-card__tag { display: inline-flex; align-items: center; gap: 7px; margin-bottom: 17px; font-size: 13px; font-weight: 900; letter-spacing: .12em; }
.use-card__tag .icon { width: 16px; height: 16px; }
.use-card h3 { margin-bottom: 14px; font-size: 25px; }
.use-card p { margin: 0; font-size: 15px; }
.use-card__symbol { width: 66px; height: 66px; display: grid; place-items: center; margin: 13px 0 62px; border-radius: 22px; background: rgba(255,255,255,.34); }
.use-card__symbol .icon { width: 32px; height: 32px; }
.use-card--yellow { color: #4d3b00; background: var(--yellow); }
.use-card--blue { color: var(--white); background: var(--blue); }
.use-card--green { color: var(--white); background: var(--green); }
.use-card--blue p, .use-card--green p { color: rgba(255,255,255,.76); }
.water-feature { display: grid; grid-template-columns: .86fr 1.14fr; margin-top: 24px; overflow: hidden; border-radius: var(--radius-lg); color: var(--white); background: var(--blue-deep); box-shadow: var(--shadow-lg); }
.water-feature__image { position: relative; min-height: 640px; overflow: hidden; }
.water-feature__image picture, .water-feature__image img { width: 100%; height: 100%; }
.water-feature__image img { object-fit: cover; }
.water-feature__image::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 52%, rgba(7,47,79,.52)); }
.water-feature__image > span { position: absolute; z-index: 2; left: 25px; top: 25px; padding: 9px 14px; border-radius: 999px; color: var(--blue-deep); background: var(--yellow); font-size: 13px; font-weight: 900; }
.water-feature__copy { padding: clamp(50px, 5vw, 78px); }
.water-feature__copy h3 { max-width: 720px; margin-bottom: 22px; font-size: clamp(34px, 2.5vw, 48px); }
.water-feature__lead { max-width: 760px; margin-bottom: 34px; color: rgba(255,255,255,.78); font-size: 18px; }
.water-paths { display: grid; gap: 20px; margin: 0; padding: 0; list-style: none; }
.water-paths li { display: grid; grid-template-columns: 44px 1fr; gap: 16px; }
.water-paths li > span { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 14px; color: var(--blue-deep); background: #abd8f3; font-size: 12px; font-weight: 900; }
.water-paths__icon { position: relative; }
.water-paths__icon .icon { width: 22px; height: 22px; }
.water-paths__icon small { position: absolute; right: -5px; bottom: -6px; min-width: 21px; height: 21px; display: grid; place-items: center; border: 2px solid var(--blue-deep); border-radius: 50%; color: var(--blue-deep); background: var(--yellow); font-size: 8px; font-weight: 950; }
.water-paths strong { display: block; margin-bottom: 4px; font-size: 18px; }
.water-paths p { margin: 0; color: rgba(255,255,255,.69); font-size: 14px; }
.water-feature__note { display: flex; gap: 12px; margin: 31px 0 0; padding-top: 25px; border-top: 1px solid rgba(255,255,255,.15); color: rgba(255,255,255,.72); font-size: 14px; }
.water-feature__note .icon { flex: 0 0 auto; width: 24px; height: 24px; color: var(--yellow); }
.water-feature__note strong { color: var(--white); }

.straw-story { color: var(--white); background: var(--ink); }
.straw-story__grid { display: grid; grid-template-columns: .72fr 1.28fr; gap: clamp(70px, 8vw, 140px); align-items: center; }
.straw-story__copy h2 { margin-bottom: 24px; }
.straw-story__copy > p:last-child { color: rgba(255,255,255,.68); font-size: 18px; }
.story-steps { position: relative; display: grid; gap: 18px; margin: 0; padding: 0; list-style: none; }
.story-steps::before { content: ""; position: absolute; left: 26px; top: 29px; bottom: 29px; width: 2px; background: rgba(242,200,75,.32); }
.story-steps li { position: relative; display: grid; grid-template-columns: 54px 1fr; gap: 21px; align-items: start; }
.story-steps li > span { position: relative; z-index: 1; width: 54px; height: 54px; display: grid; place-items: center; border-radius: 50%; color: var(--ink); background: var(--yellow); font-weight: 900; }
.story-steps li > span .icon { width: 25px; height: 25px; }
.story-steps li > span small { position: absolute; right: -4px; bottom: -3px; width: 20px; height: 20px; display: grid; place-items: center; border: 2px solid var(--ink); border-radius: 50%; color: var(--ink); background: var(--white); font-size: 9px; }
.story-steps li > div { padding: 18px 24px 18px; border: 1px solid rgba(255,255,255,.11); border-radius: var(--radius-sm); background: rgba(255,255,255,.055); }
.story-steps strong { display: block; margin-bottom: 5px; font-size: 18px; }
.story-steps p { margin: 0; color: rgba(255,255,255,.64); font-size: 14px; }

.check-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin: 0; padding: 0; list-style: none; }
.check-grid li { position: relative; min-height: 326px; padding: 30px; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--white); }
.check-grid__number { position: absolute; right: 18px; top: 13px; color: #edf2ef; font-size: 62px; font-weight: 900; }
.check-grid__icon { position: relative; width: 64px; height: 64px; display: grid; place-items: center; margin: 44px 0 29px; border-radius: 21px; color: var(--green); background: var(--green-soft); }
.check-grid__icon .icon { width: 30px; height: 30px; }
.check-grid li:nth-child(2) .check-grid__icon, .check-grid li:nth-child(3) .check-grid__icon { color: var(--blue); background: var(--blue-soft); }
.check-grid li:nth-child(4) .check-grid__icon { color: #8b6900; background: var(--yellow-soft); }
.check-grid h3 { margin-bottom: 13px; font-size: 23px; }
.check-grid p { margin: 0; color: var(--muted); font-size: 15px; }
.check-summary { max-width: 1050px; display: flex; align-items: center; gap: 20px; margin: 48px auto 0; padding: 24px 28px; border-radius: var(--radius-sm); background: var(--green-soft); }
.check-summary .icon { flex: 0 0 auto; width: 31px; height: 31px; color: var(--green); }
.check-summary p { margin: 0; }

.faq-section { background: #f1f5f2; }
.faq-layout { display: grid; grid-template-columns: .72fr 1.28fr; gap: clamp(70px, 8vw, 140px); align-items: start; }
.faq-intro { position: sticky; top: calc(var(--header-height) + 42px); }
.faq-intro h2 { margin-bottom: 24px; }
.faq-intro > p { color: var(--muted); font-size: 18px; }
.faq-intro__visual { position: relative; width: min(100%, 360px); height: 190px; margin-top: 46px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: linear-gradient(135deg, var(--green-soft), var(--blue-soft)); overflow: hidden; }
.faq-intro__visual::before { content: ""; position: absolute; inset: 18px; border: 1px dashed rgba(20,122,85,.24); border-radius: 28px; }
.faq-intro__visual span { position: absolute; width: 66px; height: 66px; display: grid; place-items: center; border: 3px solid rgba(255,255,255,.85); border-radius: 22px; box-shadow: var(--shadow-sm); }
.faq-intro__visual span .icon { width: 31px; height: 31px; }
.faq-intro__visual span:nth-child(1) { left: 34px; top: 26px; color: var(--white); background: var(--green); transform: rotate(-5deg); }
.faq-intro__visual span:nth-child(2) { left: 128px; top: 92px; color: var(--green-deep); background: var(--yellow); transform: rotate(7deg); }
.faq-intro__visual span:nth-child(3) { right: 32px; top: 30px; color: var(--white); background: var(--blue); transform: rotate(5deg); }
.faq-intro__visual span:nth-child(4) { right: 55px; bottom: 13px; width: 50px; height: 50px; color: var(--blue-deep); background: var(--white); }
.faq-intro__visual span:nth-child(4) .icon { width: 24px; height: 24px; }
.faq-list { display: grid; gap: 13px; }
.faq-list details { border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--white); }
.faq-list summary { min-height: 80px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 20px 25px; cursor: pointer; list-style: none; font-size: 19px; font-weight: 800; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary .icon { flex: 0 0 auto; transition: transform .22s; }
.faq-list details[open] summary .icon { transform: rotate(180deg); }
.faq-list details > div { padding: 0 25px 25px; color: var(--muted); }
.faq-list details > div p { margin: 0; }

.resources { padding: 90px 0 104px; background: var(--paper); }
.resources__heading { display: grid; grid-template-columns: 1fr .8fr; align-items: end; gap: 8vw; margin-bottom: 35px; }
.resources__heading h2 { margin-bottom: 0; font-size: clamp(31px, 2.4vw, 44px); }
.resources__heading > p { margin: 0; color: var(--muted); }
.resource-details { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.resource-details details { border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--white); }
.resource-details summary { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 18px 22px; cursor: pointer; list-style: none; font-weight: 800; }
.resource-details summary::-webkit-details-marker { display: none; }
.resource-details summary span { display: inline-flex; align-items: center; gap: 10px; }
.resource-details summary span .icon { color: var(--blue); }
.resource-details__chevron { transition: transform .22s; }
.resource-details details[open] .resource-details__chevron { transform: rotate(180deg); }
.resource-details__body { padding: 0 22px 24px; color: var(--muted); }
.source-list { display: grid; gap: 0; margin: 0; padding: 0; list-style: none; }
.source-list li { padding: 16px 0; border-top: 1px solid var(--line); }
.source-list a, .source-list li > span { display: block; }
.source-list a { color: var(--blue-deep); font-weight: 750; text-underline-offset: 4px; }
.source-list li > span { margin-top: 4px; font-size: 13px; }
.source-list--compact li { padding: 12px 0; }

.site-footer { padding: 45px var(--gutter); color: rgba(255,255,255,.7); background: #0b2f27; font-size: 13px; }
.site-footer__inner { max-width: var(--shell); margin-inline: auto; text-align: center; }
.site-footer p { margin: 0 0 6px; }
.site-footer__filings { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 8px 14px; margin-top: 18px; }
.site-footer__filings img { width: 18px; height: 20px; }
.site-footer__filings a { color: rgba(255,255,255,.72); text-decoration: none; }
.site-footer__filings a:hover { color: var(--white); text-decoration: underline; }
.back-to-top { position: fixed; z-index: 900; right: max(22px, env(safe-area-inset-right)); bottom: max(22px, env(safe-area-inset-bottom)); width: 52px; height: 52px; display: grid; place-items: center; border: 0; border-radius: 50%; color: var(--white); background: var(--green); box-shadow: var(--shadow-lg); cursor: pointer; }
.back-to-top[hidden] { display: none; }

@media (max-width: 1280px) {
  :root { --gutter: clamp(24px, 4vw, 56px); }
  .hero__grid { grid-template-columns: 1fr .88fr; gap: 54px; }
  .hero-card__badge--yellow { left: -15px; }
  .hero-card__badge--blue { right: -13px; }
  .meaning-grid, .check-grid { grid-template-columns: repeat(2, 1fr); }
  .use-grid { grid-template-columns: 1.3fr 1fr 1fr; }
  .use-card--green { grid-column: span 3; min-height: auto; display: grid; grid-template-columns: 100px 1fr; align-items: center; gap: 20px; }
  .use-card--green .use-card__symbol { margin: 0; }
}

@media (max-width: 1020px) {
  :root { --header-height: 72px; }
  .site-header { background: var(--paper); backdrop-filter: none; }
  .nav-toggle { display: inline-flex; }
  .nav-panel { position: fixed; z-index: 1001; left: 0; right: 0; top: var(--header-height); width: 100vw; height: calc(100dvh - var(--header-height)); display: none; margin: 0; padding: 24px var(--gutter) max(32px, env(safe-area-inset-bottom)); overflow-y: auto; overscroll-behavior: contain; background: var(--paper); }
  .nav-panel.is-open { display: block; }
  .nav-links { display: grid; gap: 0; }
  .nav-links li { border-bottom: 1px solid var(--line); }
  .nav-links a { display: flex; align-items: center; min-height: 68px; padding: 14px 2px; font-size: 19px; }
  .nav-links a::after { display: none; }
  .hero__grid { min-height: auto; grid-template-columns: 1fr; gap: 62px; padding-top: 74px; padding-bottom: 82px; }
  .hero__copy { max-width: 820px; }
  .hero-card { max-width: 760px; margin-inline: auto; transform: none; }
  .source-grid { grid-template-columns: repeat(2, 1fr); }
  .section-heading--split { grid-template-columns: 1fr; gap: 25px; }
  .question-path { grid-template-columns: 1fr; }
  .question-path > li { display: grid; grid-template-columns: .82fr 1.18fr; }
  .question-path__image { height: 100%; min-height: 330px; }
  .question-path h3 { min-height: 0; }
  .question-path__copy { display: flex; flex-direction: column; justify-content: center; }
  .use-grid { grid-template-columns: 1fr 1fr; }
  .use-card--photo { grid-row: span 2; }
  .use-card--green { grid-column: auto; min-height: 385px; display: block; }
  .use-card--green .use-card__symbol { margin: 13px 0 62px; }
  .water-feature { grid-template-columns: 1fr; }
  .water-feature__image { min-height: 440px; max-height: 520px; }
  .straw-story__grid, .faq-layout { grid-template-columns: 1fr; gap: 55px; }
  .faq-intro { position: static; }
  .resource-details { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  :root { --gutter: 20px; --radius-lg: 28px; --radius-md: 22px; }
  body { font-size: 16px; line-height: 1.7; }
  h1 { font-size: clamp(39px, 10.1vw, 46px); }
  h2 { font-size: clamp(31px, 8vw, 38px); }
  h3 { font-size: 22px; }
  .section { padding: 82px 0; }
  .brand__mark { width: 31px; height: 31px; }
  .brand__mark i { width: 13px; height: 13px; }
  .brand__text strong { font-size: 19px; }
  .brand__text small { font-size: 7px; }
  .nav-toggle span { display: none; }
  .hero__grid { gap: 48px; padding-top: 56px; padding-bottom: 64px; }
  .eyebrow, .kicker { font-size: 13px; letter-spacing: .1em; }
  .hero h1 { margin-bottom: 22px; }
  .hero__lead { margin-bottom: 28px; font-size: 18px; line-height: 1.75; }
  .hero__actions { align-items: flex-start; flex-direction: column; gap: 17px; margin-bottom: 36px; }
  .button { width: 100%; min-height: 54px; }
  .hero__facts { grid-template-columns: 1fr; gap: 10px; }
  .hero__facts li { min-height: 104px; padding: 16px 17px; }
  .hero__fact-icon { width: 34px; height: 34px; margin-bottom: 9px; }
  .hero__facts span { top: 7px; }
  .hero-card { padding: 11px; }
  .hero-card picture { aspect-ratio: 1.12 / 1; }
  .hero-card figcaption { padding: 20px 13px 12px; }
  .hero-card__badge { padding: 8px 12px; border-width: 2px; font-size: 11px; }
  .hero-card__badge--yellow { left: 2px; top: 18px; }
  .hero-card__badge--blue { right: 3px; bottom: 112px; }
  .resource-ribbon__inner { justify-content: flex-start; min-height: 0; padding-top: 22px; padding-bottom: 22px; gap: 8px 15px; }
  .resource-ribbon__inner strong { flex-basis: 100%; }
  .resource-ribbon__inner span { padding: 6px 9px; }
  .section-heading { margin-bottom: 42px; }
  .section-heading h2 { margin-bottom: 17px; }
  .section-heading > p:last-child, .section-heading--split > p { font-size: 17px; }
  .meaning-grid { grid-template-columns: 1fr; }
  .source-grid, .check-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  .source-card { min-height: 0; padding: 20px 17px; }
  .source-card .icon { width: 32px; height: 32px; margin-bottom: 16px; }
  .source-card h3 { font-size: 18px; }
  .source-card p { font-size: 13px; line-height: 1.55; }
  .definition-note { grid-template-columns: 1fr; gap: 18px; margin-top: 48px; padding: 29px 25px; }
  .definition-note__icon { width: 62px; height: 62px; border-radius: 19px; }
  .definition-note h3 { font-size: 25px; }
  .meaning-card { min-height: 0; padding: 27px 25px 28px; }
  .meaning-card__icon { margin: 32px 0 22px; }
  .meaning-card h3 { min-height: 0; }
  .question-path { gap: 16px; }
  .question-path > li { display: block; }
  .question-path__image { height: 200px; min-height: 0; }
  .question-path__visual-icon { right: 14px; bottom: 14px; width: 50px; height: 50px; border-radius: 16px; }
  .question-path__visual-icon .icon { width: 24px; height: 24px; }
  .question-path__copy { padding: 25px; }
  .question-path h3 { font-size: 25px; }
  .use-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  .use-card { min-height: 0; padding: 22px 18px; }
  .use-card--photo { grid-column: 1 / -1; grid-row: auto; padding: 0; }
  .use-card__copy { padding: 23px 22px 25px; }
  .use-card__symbol { width: 56px; height: 56px; margin: 2px 0 28px; }
  .use-card h3 { font-size: 21px; }
  .use-card p { font-size: 13px; line-height: 1.55; }
  .use-card--green { grid-column: 1 / -1; min-height: 0; display: grid; grid-template-columns: 58px 1fr; column-gap: 16px; }
  .use-card--green .use-card__symbol { grid-row: 1 / span 3; margin: 0; }
  .use-card--green .use-card__tag { margin-bottom: 5px; }
  .use-card--green h3 { margin-bottom: 7px; }
  .water-feature { margin-top: 16px; }
  .water-feature__image { min-height: 280px; }
  .water-feature__copy { padding: 34px 25px; }
  .water-feature__copy h3 { font-size: 31px; }
  .water-feature__lead { font-size: 16px; }
  .water-paths { gap: 23px; }
  .water-paths li { grid-template-columns: 44px 1fr; gap: 13px; }
  .water-paths li > span { width: 40px; height: 40px; }
  .water-paths__icon .icon { width: 20px; height: 20px; }
  .straw-story__grid { gap: 39px; }
  .story-steps li { grid-template-columns: 44px 1fr; gap: 14px; }
  .story-steps::before { left: 21px; }
  .story-steps li > span { width: 44px; height: 44px; }
  .story-steps li > div { padding: 15px 17px; }
  .check-grid li { min-height: 0; padding: 20px 17px; }
  .check-grid__number { font-size: 46px; }
  .check-grid__icon { width: 54px; height: 54px; margin: 31px 0 20px; }
  .check-grid h3 { font-size: 19px; }
  .check-grid p { font-size: 13px; line-height: 1.55; }
  .check-summary { align-items: flex-start; padding: 21px; }
  .faq-layout { gap: 32px; }
  .faq-intro__visual { height: 160px; margin-top: 28px; }
  .faq-intro__visual span { width: 55px; height: 55px; border-radius: 18px; }
  .faq-intro__visual span .icon { width: 26px; height: 26px; }
  .faq-list summary { min-height: 70px; padding: 17px 19px; font-size: 17px; }
  .faq-list details > div { padding: 0 19px 21px; }
  .resources { padding: 75px 0 86px; }
  .resources__heading { grid-template-columns: 1fr; gap: 16px; }
  .resource-details summary { padding: 17px 18px; }
  .resource-details__body { padding: 0 18px 20px; }
  .site-footer { padding: 38px 20px max(38px, env(safe-area-inset-bottom)); }
  .site-footer__filings { align-items: center; flex-direction: column; }
  .site-footer__filings img { margin-bottom: 2px; }
  .back-to-top { width: 48px; height: 48px; }
}

@media (max-width: 390px) {
  :root { --gutter: 17px; }
  .use-grid, .check-grid { grid-template-columns: 1fr; }
  .use-card--photo, .use-card--green { grid-column: auto; }
  .use-card--green { display: block; }
  .use-card--green .use-card__symbol { margin: 2px 0 28px; }
  h1 { font-size: 38px; }
  .hero__lead { font-size: 17px; }
  .hero-card__badge--blue { bottom: 128px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .001ms !important; animation-duration: .001ms !important; animation-iteration-count: 1 !important; }
}