:root{color-scheme:light;--bg: #eef5f4;--surface: #ffffff;--ink: #10171a;--muted: #4c6068;--line: rgba(15, 26, 28, .12);--accent: #2f8fa3;--accent-strong: #1d5b66;--accent-soft: rgba(47, 143, 163, .14);--frost: rgba(255, 255, 255, .6);--frost-line: rgba(255, 255, 255, .35);--basalt: #12181b;--basalt-soft: rgba(18, 24, 27, .9);--geothermal: #d97b3f;--geothermal-strong: #b85f2c;--hero-overlay: linear-gradient(125deg, rgba(6, 16, 20, .92), rgba(15, 60, 66, .66));--shadow: 0 16px 40px rgba(10, 20, 24, .14);--radius: 20px;--wave-divider: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 60' preserveAspectRatio='none'%3E%3Cpath d='M0,32 C240,60 480,4 720,22 C960,40 1200,58 1440,26 L1440,60 L0,60 Z' fill='%23eef5f4'/%3E%3C/svg%3E");--wave-divider-basalt: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 60' preserveAspectRatio='none'%3E%3Cpath d='M0,32 C240,60 480,4 720,22 C960,40 1200,58 1440,26 L1440,60 L0,60 Z' fill='%2312181b'/%3E%3C/svg%3E");--font-body: "Source Sans 3", system-ui, sans-serif;--font-display: "Fraunces", Georgia, serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:var(--font-body);color:var(--ink);background:radial-gradient(circle at top right,rgba(13,148,136,.08),transparent 24%),radial-gradient(circle at 20% 0%,rgba(59,130,246,.06),transparent 30%),var(--bg);line-height:1.65}img{max-width:100%;height:auto;display:block}a{color:var(--accent-strong);text-decoration-thickness:1px;text-underline-offset:.18em}a:hover{color:var(--accent)}.skip-link{position:absolute;left:-9999px;top:0;background:var(--accent);color:#fff;padding:.75rem 1rem;z-index:100}.skip-link:focus{left:1rem;top:1rem}.container{width:min(1140px,calc(100% - 2rem));margin-inline:auto}.site-header{position:sticky;top:0;z-index:20;backdrop-filter:blur(16px);background:#eef5f4db;border-bottom:1px solid var(--line)}.header-inner,.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.95rem 0}.brand{display:flex;align-items:center;gap:.85rem;color:inherit;text-decoration:none}.brand-mark{display:block;width:4.125rem;height:4.125rem;border-radius:1.25rem;overflow:hidden;box-shadow:var(--shadow)}.brand-mark img{display:block;width:100%;height:100%;object-fit:cover}.brand-text{display:flex;flex-direction:column;line-height:1.15}.brand-text small{color:var(--muted);font-size:.84rem}nav{display:flex;gap:.35rem}nav a{color:var(--ink);text-decoration:none;font-weight:600;padding:.55rem .9rem;border-radius:999px;transition:background .2s ease,color .2s ease}nav a:hover{background:var(--accent-soft);color:var(--accent-strong)}.site-footer{position:relative;margin-top:calc(5rem + 40px);background:var(--basalt);color:#ffffffd1}.site-footer:before{content:"";position:absolute;left:0;right:0;bottom:100%;width:100%;height:40px;background:var(--wave-divider-basalt) bottom / 100% 100% no-repeat}.site-footer p{margin:0;color:#ffffffa8}.site-footer a{color:#ffffffeb}.site-footer a:hover{color:#fff}.footer-links{display:flex;gap:1rem;flex-wrap:wrap}.eyebrow{margin:0 0 .75rem;color:var(--accent-strong);font-size:.82rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase}.page-heading{margin:0 0 .65rem;font-family:var(--font-display);font-size:clamp(2rem,4vw,3.2rem);line-height:1.02;letter-spacing:-.02em}.page-intro{margin:0;max-width:62ch;color:var(--muted);font-size:1.08rem}.section-heading{margin-bottom:2rem}.section-cta{margin-top:2rem}.section{padding:3.5rem 0}.section-tight{padding:2rem 0 3rem}.page-banner{position:relative;padding:3.5rem 0 2.75rem;background:linear-gradient(180deg,#ffffffb8,#fff0),radial-gradient(circle at top left,var(--accent-soft),transparent 40%)}.page-banner:after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:28px;background:var(--wave-divider) bottom / 100% 100% no-repeat}.badge{display:inline-flex;align-items:center;gap:.3rem;padding:.28rem .7rem;border-radius:999px;font-size:.76rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;background:var(--accent-soft);color:var(--accent-strong)}.badge[class*=grade-]:before{content:"";width:.65rem;height:.65rem;flex:none;background-color:currentColor;-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 2c-1 4-6 7-6 12a6 6 0 0012 0c0-5-5-8-6-12z'/%3E%3C/svg%3E") center / contain no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 2c-1 4-6 7-6 12a6 6 0 0012 0c0-5-5-8-6-12z'/%3E%3C/svg%3E") center / contain no-repeat}.grade-flat{background:#3b82f61f;color:#1d4ed8}.grade-i,.grade-ii,.grade-iii{background:#10b9811f;color:#047857}.grade-iv{background:#f59e0b24;color:#b45309}.grade-v,.grade-vi{background:#ef44441f;color:#b91c1c}.grade-unknown{background:#64748b1f;color:#475569}.button{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.9rem 1.35rem;border-radius:999px;border:0;background:var(--accent);color:#fff;font-weight:700;text-decoration:none;box-shadow:var(--shadow);transition:transform .2s ease,background .2s ease}.button:hover{background:var(--accent-strong);color:#fff;transform:translateY(-1px)}.button-secondary{background:#ffffff1f;border:1px solid rgba(255,255,255,.28);box-shadow:none}.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.35rem}.river-card,.gallery-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .22s ease,box-shadow .22s ease}.river-card:hover,.gallery-card:hover{transform:translateY(-4px);box-shadow:0 24px 50px #1d5b6638}.river-card a,.gallery-card button{color:inherit;text-decoration:none;display:block;height:100%}.river-card img,.gallery-card img{width:100%;aspect-ratio:4 / 3;object-fit:cover}.river-card-fallback{aspect-ratio:4 / 3;background:linear-gradient(135deg,#dbeafe,#ccfbf1,#e0f2fe)}.river-card-body,.gallery-card-body{padding:1.1rem 1.15rem 1.25rem}.river-card h2,.gallery-card h2{margin:.45rem 0 .55rem;font-family:var(--font-display);font-size:1.38rem;line-height:1.15}.river-card p,.gallery-card p{margin:0;color:var(--muted);font-size:.96rem;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.feature-strip{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem}.feature-item,.meta-item{padding:1rem 1.1rem;border-radius:16px;background:var(--frost);border:1px solid var(--frost-line);backdrop-filter:blur(10px)}.feature-item span,.meta-item span{display:block;font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:.25rem}.feature-item strong,.meta-item strong{font-size:1rem;line-height:1.35}.meta-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:.85rem;margin:0 0 2rem}.prose{max-width:74ch}.prose h2,.prose h3{font-family:var(--font-display);margin-top:2rem;line-height:1.15}.prose h2{font-size:1.75rem}.prose h3{font-size:1.15rem;color:var(--accent-strong);text-transform:uppercase;letter-spacing:.06em}.prose p,.prose li{color:#243447}.notice{padding:1rem 1.1rem;margin-bottom:2rem;border-left:4px solid #f59e0b;border-radius:14px;background:#f59e0b1a}.river-section{padding-top:1rem;margin-top:2rem;border-top:1px solid var(--line)}.river-photo,.gallery-thumb{margin:1.5rem 0}.river-photo img,.gallery-thumb img{border-radius:16px;box-shadow:var(--shadow)}.river-photo figcaption{margin-top:.55rem;color:var(--muted);font-size:.92rem}.diary-prose{font-size:1.08rem;line-height:1.75}.diary-prose p,.diary-prose li{color:#243447}.diary-prose p{margin:0 0 1.25rem}.diary-prose a{font-weight:600}.diary-photo{margin:2rem 0}.diary-photo img{width:100%;border-radius:16px;box-shadow:var(--shadow)}.diary-photo figcaption{margin-top:.65rem;color:var(--muted);font-size:.92rem;text-align:center}.extra-prose{max-width:68ch;font-size:1.08rem;line-height:1.75}.extra-prose p,.extra-prose li{color:#243447}.extra-prose p{margin:0 0 1.25rem}.extra-prose h1,.extra-prose h2,.extra-prose h3{font-family:var(--font-display);line-height:1.15;margin-top:2rem}.extra-prose h1{font-size:2rem}.extra-prose h2{font-size:1.5rem}.extra-prose h3{font-size:1rem;color:var(--accent-strong);text-transform:uppercase;letter-spacing:.06em}.extra-photo{margin:2rem 0}.extra-photo img{width:100%;border-radius:16px;box-shadow:var(--shadow)}.extra-photo figcaption{margin-top:.65rem;color:var(--muted);font-size:.92rem;text-align:center}.video-embed{position:relative;width:100%;aspect-ratio:16 / 9;border-radius:16px;overflow:hidden;box-shadow:var(--shadow);background:#000}.video-embed iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.map-embed{position:relative;width:100%;aspect-ratio:16 / 10;border-radius:16px;overflow:hidden;box-shadow:var(--shadow);background:#1a2428}.map-embed iframe{position:absolute;inset:0;width:100%;height:100%;border:0;pointer-events:none}.map-embed-link{position:absolute;inset:0;z-index:1}.map-embed-link:focus-visible{outline:3px solid var(--geothermal);outline-offset:-3px}.map-embed-caption{position:absolute;right:.75rem;bottom:.75rem;z-index:2;padding:.35rem .65rem;border-radius:999px;background:#12181bd1;color:#fff;font-size:.78rem;font-weight:600;pointer-events:none}.hero{position:relative;padding:5.5rem 0 4.5rem;color:#fff;overflow:hidden;background:var(--hero-overlay),var(--hero-image, linear-gradient(135deg, #0b1f33, #134e4a));background-size:cover;background-position:var(--hero-image-position, center)}.hero:after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:40px;background:var(--wave-divider) bottom / 100% 100% no-repeat}.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.25fr .75fr;gap:2rem;align-items:end}.hero h1{margin:0 0 1rem;font-family:var(--font-display);font-size:clamp(2.8rem,6vw,4.8rem);line-height:.96;letter-spacing:-.03em;max-width:11ch}.hero .eyebrow{color:#ffffffb8}.hero p{max-width:48ch;font-size:1.14rem;color:#ffffffe0}.hero-actions{display:flex;flex-wrap:wrap;gap:.85rem;margin-top:1.6rem}.hero-panel{padding:1.25rem 1.3rem;border-radius:var(--radius);background:var(--frost);border:1px solid var(--frost-line);backdrop-filter:blur(14px);color:var(--basalt)}.hero-panel span{color:var(--muted)}.hero-panel strong{display:block;font-size:2.4rem;line-height:1;margin-bottom:.35rem}.hero-stats{margin:1rem 0 0;padding-left:1.1rem;color:var(--muted)}.river-hero{position:relative;min-height:340px;display:grid;align-items:end;color:#fff;overflow:hidden;background:var(--hero-overlay),var(--hero-image, linear-gradient(135deg, #0b1f33, #134e4a));background-size:cover;background-position:var(--hero-image-position, center)}.river-hero:after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:32px;background:var(--wave-divider) bottom / 100% 100% no-repeat}.river-hero-inner{padding:2rem 0 2.5rem}.river-hero-split{min-height:0;color:var(--text);background:linear-gradient(180deg,#e8f1f4a6,#fff0)}.river-hero-split:after{display:none}.river-hero-split .back-link{color:var(--muted)}.river-hero-split .back-link:hover{color:var(--accent)}.river-hero-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:1rem;align-items:stretch}.river-hero-media{position:relative;min-height:280px;border-radius:16px;overflow:hidden;box-shadow:var(--shadow);background:#1a2428}.river-main-image{display:block;width:100%;height:100%;min-height:280px;object-fit:cover}.river-main-image-fallback{background:linear-gradient(135deg,#0b1f33,#134e4a)}.river-hero-media .river-hero-copy{position:absolute;inset:auto 0 0;padding:1.35rem 1.5rem 1.5rem;background:linear-gradient(180deg,transparent,rgba(6,16,20,.82));color:#fff}.river-hero-media .river-hero-copy h1{max-width:none;font-size:clamp(1.8rem,4vw,2.8rem)}.river-hero-media .river-hero-copy p{margin:0;font-size:.98rem}.river-hero-split .map-embed{min-height:280px;height:100%;aspect-ratio:auto}.back-link{display:inline-block;margin-bottom:1rem;color:#ffffffd1;text-decoration:none;font-weight:600}.back-link:hover{color:#fff}.river-hero-copy h1{margin:.75rem 0 .85rem;font-family:var(--font-display);font-size:clamp(2.2rem,5vw,3.8rem);line-height:1;max-width:14ch}.river-hero-copy p{max-width:58ch;color:#ffffffdb;font-size:1.05rem}.river-layout{margin-top:-1.5rem;position:relative;z-index:2}.river-gallery-block{margin-top:3rem;padding-top:2rem;border-top:1px solid var(--line)}.gallery-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem}.gallery-thumb{display:block;overflow:hidden;border-radius:16px}.gallery-card button{width:100%;padding:0;border:0;background:none;text-align:left;cursor:pointer}.filters{display:flex;flex-wrap:wrap;gap:.65rem;margin:0 0 2rem}.filter-btn{border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:999px;padding:.58rem 1rem;cursor:pointer;font:inherit;font-weight:600;transition:background .2s ease,color .2s ease,border-color .2s ease}.filter-btn.is-active,.filter-btn:hover{background:var(--accent);border-color:var(--accent);color:#fff}.lightbox{position:fixed;inset:0;display:none;align-items:center;justify-content:center;padding:1rem;background:#0b1f33e6;z-index:50}.lightbox.is-open{display:flex}.lightbox figure{margin:0;max-width:min(960px,100%)}.lightbox img{max-height:78vh;margin-inline:auto;border-radius:12px}.lightbox figcaption{color:#fff;margin-top:.75rem;text-align:center}.lightbox-close{position:absolute;top:1rem;right:1rem;border:0;background:#ffffff1f;color:#fff;border-radius:999px;width:2.5rem;height:2.5rem;font-size:1.4rem;cursor:pointer}@media (max-width: 800px){.hero-grid,.header-inner,.footer-inner,.river-hero-grid{grid-template-columns:1fr;flex-direction:column;align-items:flex-start}.hero h1,.river-hero-copy h1{max-width:none}}