@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;700&family=Noto+Sans+JP:wght@300;400;700&display=swap');

:root {
    --primary: #1c69d4;
    --primary-active: #0653b6;
    --ink: #262626;
    --body: #3c3c3c;
    --body-strong: #1a1a1a;
    --muted: #6b6b6b;
    --muted-soft: #9a9a9a;
    --hairline: #e6e6e6;
    --hairline-strong: #cccccc;
    --canvas: #ffffff;
    --surface-soft: #f7f7f7;
    --surface-card: #fafafa;
    --surface-strong: #ebebeb;
    --surface-dark: #1a2129;
    --surface-dark-elevated: #262e38;
    --on-dark-soft: #bbbbbb;
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #dc2626;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: var(--body);
    background: var(--canvas);
    font-family: "Inter", "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 16px;
    font-weight: 300;
    line-height: 1.55;
}
a { color: inherit; }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
h1, h2, h3, strong { color: var(--ink); font-weight: 700; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.15; letter-spacing: 0; }
h2 { font-size: clamp(32px, 3.4vw, 48px); }

header {
    position: sticky;
    z-index: 30;
    top: 0;
    height: 64px;
    border-bottom: 1px solid var(--hairline);
    background: var(--canvas);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: min(1440px, calc(100% - 64px));
    height: 64px;
    margin: 0 auto;
    gap: 32px;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; line-height: 1.1; }
.brand-mark {
    display: grid;
    place-items: center;
    width: 40px;
    height: 40px;
    color: var(--canvas);
    background: var(--primary);
    font-size: 20px;
    font-weight: 700;
}
.brand strong { display: block; font-size: 17px; }
.brand small { display: block; margin-top: 4px; color: var(--muted); font-size: 10px; font-weight: 400; letter-spacing: .05em; }
nav { display: flex; align-items: center; gap: 30px; }
nav a { position: relative; color: var(--ink); font-size: 14px; font-weight: 400; letter-spacing: .3px; text-decoration: none; }
nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -21px; height: 2px; background: var(--primary); transition: right .18s ease; }
nav a:hover::after { right: 0; }
.mobile-menu { display: none; }

main { width: min(1440px, calc(100% - 64px)); margin: 0 auto; padding: 48px 0 80px; }
.eyebrow {
    margin: 0 0 12px;
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: 1.5px;
    text-transform: uppercase;
}
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 160px;
    min-height: 48px;
    padding: 14px 32px;
    border: 0;
    border-radius: 0;
    color: var(--canvas);
    background: var(--primary);
    font-size: 14px;
    font-weight: 700;
    line-height: 1;
    letter-spacing: .5px;
    text-decoration: none;
    cursor: pointer;
}
.button:hover { background: var(--primary-active); }
.button-secondary { color: var(--ink); background: var(--canvas); border: 1px solid var(--hairline-strong); }
.button-secondary:hover { color: var(--canvas); background: var(--ink); border-color: var(--ink); }
.button-dark { color: var(--canvas); background: transparent; border: 1px solid var(--canvas); }
.button-dark:hover { color: var(--ink); background: var(--canvas); }
.button-small { min-width: 0; min-height: 40px; padding: 12px 18px; font-size: 12px; }
.text-link {
    color: var(--ink);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-decoration: none;
    text-transform: uppercase;
}
.text-link::before { content: ""; display: inline-block; width: 14px; height: 2px; margin: 0 8px 3px 0; background: var(--primary); }
.text-link:hover { color: var(--primary); }

.home-hero {
    display: grid;
    grid-template-columns: 1.05fr .95fr;
    min-height: 600px;
    overflow: hidden;
    color: var(--canvas);
    background: var(--surface-dark);
}
.hero-copy { display: flex; flex-direction: column; justify-content: center; padding: 80px; }
.hero-copy .eyebrow { color: #6ca8f4; }
.hero-copy h1 { max-width: 720px; margin-bottom: 32px; color: var(--canvas); font-size: clamp(48px, 5vw, 64px); line-height: 1.05; }
.hero-copy h1 em { color: var(--canvas); font-style: normal; }
.hero-copy > p:not(.eyebrow) { max-width: 620px; color: var(--on-dark-soft); font-size: 18px; font-weight: 300; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 24px; }
.hero-actions .button-secondary { color: var(--canvas); background: transparent; border-color: var(--canvas); }
.hero-actions .button-secondary:hover { color: var(--ink); background: var(--canvas); }
.hero-visual { position: relative; min-height: 520px; overflow: hidden; background: linear-gradient(#36526d 0 53%, #d6dce3 53%); }
.sun { position: absolute; top: 72px; right: 80px; width: 110px; height: 110px; border: 18px solid rgba(255,255,255,.08); border-radius: 50%; background: #dce8f5; }
.mountain { position: absolute; right: -80px; bottom: 54px; width: 125%; height: 62%; clip-path: polygon(0 100%, 23% 34%, 42% 72%, 67% 10%, 100% 100%); }
.mountain-back { background: #738ca4; transform: translateY(-42px) scale(1.08); opacity: .75; }
.mountain-front { background: var(--surface-dark-elevated); }
.river { position: absolute; right: -50px; bottom: -70px; width: 130%; height: 180px; background: var(--primary); transform: rotate(-7deg); }
.hero-label { position: absolute; right: 32px; bottom: 28px; color: rgba(255,255,255,.7); font-size: 12px; font-weight: 700; line-height: 1.2; letter-spacing: 2px; text-align: right; }

.quick-section, .weekend-section { padding-top: 80px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 32px; }
.section-heading h2 { margin-bottom: 0; }
.quick-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--hairline); }
.quick-grid a {
    min-height: 176px;
    padding: 24px;
    background: var(--canvas);
    text-decoration: none;
    transition: background .18s ease;
}
.quick-grid a:hover { background: var(--surface-card); }
.quick-grid span { display: block; margin-bottom: 24px; font-size: 26px; filter: grayscale(1); }
.quick-grid strong { display: block; margin-bottom: 6px; font-size: 18px; }
.quick-grid small { color: var(--muted); font-size: 14px; font-weight: 300; }

.event-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.event-card { display: flex; flex-direction: column; min-width: 0; padding: 24px; background: var(--surface-card); }
.event-card::before { content: ""; display: block; width: 48px; height: 4px; margin-bottom: 24px; background: var(--primary); }
.event-card > a { text-decoration: none; }
.event-date { margin-bottom: 12px; color: var(--primary); font-size: 12px; font-weight: 400; letter-spacing: .5px; }
.event-title { margin-bottom: 16px; font-size: 20px; line-height: 1.3; }
.event-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.tag { display: inline-flex; padding: 8px 10px; border: 1px solid var(--hairline-strong); color: var(--body); background: var(--canvas); font-size: 12px; font-weight: 400; }
.event-description { color: var(--body); font-size: 14px; font-weight: 300; }
.event-venue { margin-top: auto; color: var(--body-strong); font-size: 13px; font-weight: 400; }
.event-card-footer { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-top: 16px; border-top: 1px solid var(--hairline); }
.status { color: var(--body-strong); font-size: 12px; font-weight: 400; }
.status::before { content: ""; display: inline-block; width: 7px; height: 7px; margin-right: 7px; border-radius: 50%; background: var(--success); }
.status-past { color: var(--muted-soft); }.status-past::before { background: var(--muted-soft); }
.event-card-footer .text-link { font-size: 11px; }
.loading, .empty-state { grid-column: 1 / -1; padding: 64px; border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); color: var(--muted); text-align: center; }

.mission-panel {
    display: grid;
    grid-template-columns: 1.15fr 1fr auto;
    align-items: center;
    gap: 48px;
    margin-top: 80px;
    padding: 80px;
    color: var(--canvas);
    background: var(--surface-dark);
}
.mission-panel .eyebrow { color: #6ca8f4; }
.mission-panel h2 { margin-bottom: 0; color: var(--canvas); font-size: 32px; }
.mission-panel > p { margin-bottom: 0; color: var(--on-dark-soft); }

.page-hero { margin-bottom: 48px; padding: 80px; color: var(--canvas); background: var(--surface-dark); }
.page-hero .eyebrow { color: #6ca8f4; }
.page-hero h1 { margin-bottom: 16px; color: var(--canvas); font-size: clamp(40px, 5vw, 64px); line-height: 1.05; }
.page-hero > p:last-child { max-width: 760px; margin-bottom: 0; color: var(--on-dark-soft); font-size: 18px; }
.page-hero code { color: var(--canvas); }
.compact-hero { padding-top: 80px; }

.filter-panel {
    display: grid;
    grid-template-columns: 1.6fr repeat(3, 1fr) auto auto;
    align-items: end;
    gap: 16px;
    padding: 24px;
    border: 1px solid var(--hairline);
    background: var(--surface-soft);
}
.filter-panel label, .admin-panel label { display: grid; gap: 8px; color: var(--body); font-size: 12px; font-weight: 400; letter-spacing: .5px; }
input, select, textarea { width: 100%; border: 1px solid var(--hairline-strong); border-radius: 0; color: var(--ink); background: var(--canvas); outline: none; }
input, select { height: 48px; padding: 0 16px; }
textarea { padding: 16px; line-height: 1.55; }
input:focus, select:focus, textarea:focus { border: 2px solid var(--ink); }
.check-label { display: flex !important; align-items: center; min-height: 48px; white-space: nowrap; }
.check-label input { width: 18px; height: 18px; accent-color: var(--primary); }
.filter-reset { min-height: 48px; padding: 0 16px; border: 0; color: var(--ink); background: transparent; font-size: 12px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; cursor: pointer; }
.filter-reset:hover { color: var(--primary); }
.results-toolbar { display: flex; justify-content: space-between; align-items: center; margin: 48px 0 24px; }
.results-toolbar p { margin-bottom: 0; }.results-toolbar strong { font-size: 32px; }
.view-switch { display: flex; gap: 24px; border-bottom: 1px solid var(--hairline); }
.view-switch button { padding: 12px 0; border: 0; border-bottom: 2px solid transparent; color: var(--muted); background: transparent; font-size: 12px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; cursor: pointer; }
.view-switch button.active { color: var(--ink); border-bottom-color: var(--ink); }
.data-note { margin: 24px 0 0; color: var(--muted); font-size: 12px; font-weight: 400; }

.calendar-list { display: grid; gap: 32px; }
.calendar-day { display: grid; grid-template-columns: 200px 1fr; gap: 32px; padding-top: 32px; border-top: 1px solid var(--hairline); }
.calendar-day h2 { position: sticky; top: 96px; align-self: start; font-size: 24px; }
.calendar-cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.map-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; padding: 1px; background: var(--hairline); }
.map-event { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 24px; background: var(--canvas); }
.map-event h3 { margin-bottom: 4px; font-size: 18px; }.map-event p { margin-bottom: 0; color: var(--muted); font-size: 12px; }

.detail-shell { max-width: 1180px; margin: 0 auto; }
.back-link { display: inline-block; margin: 16px 0 32px; color: var(--ink); font-size: 13px; font-weight: 700; letter-spacing: 1.5px; text-decoration: none; text-transform: uppercase; }
.back-link:hover { color: var(--primary); }
.detail-hero { padding: 80px; color: var(--canvas); background: var(--surface-dark); }
.detail-hero .event-date { color: #6ca8f4; }
.detail-hero h1 { max-width: 950px; margin-bottom: 24px; color: var(--canvas); font-size: clamp(40px, 5vw, 64px); line-height: 1.05; }
.detail-hero .tag { color: var(--canvas); background: transparent; border-color: #65717d; }
.detail-lead { max-width: 800px; margin: 24px 0 0; color: var(--on-dark-soft); font-size: 18px; }
.detail-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 1px; margin-top: 1px; background: var(--hairline); }
.detail-card { padding: 32px; background: var(--canvas); }
.detail-card h2 { font-size: 24px; }
.detail-list { margin: 0; }
.detail-list > div { display: grid; grid-template-columns: 120px 1fr; gap: 24px; padding: 16px 0; border-top: 1px solid var(--hairline); }
.detail-list dt { color: var(--muted); font-size: 12px; font-weight: 400; letter-spacing: .5px; }.detail-list dd { margin: 0; color: var(--body-strong); font-size: 14px; font-weight: 300; }
.map-card iframe { width: 100%; height: 300px; margin-bottom: 16px; border: 0; border-radius: 0; filter: grayscale(.5); }
.map-card > a { display: block; margin-top: 12px; }
.open-data-link { padding: 14px 16px; border-left: 4px solid var(--primary); color: var(--ink); background: var(--surface-soft); font-size: 12px; font-weight: 400; text-decoration: none; }
.detail-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 24px; }
.sample-note { width: 100%; padding: 16px; border-left: 4px solid var(--warning); color: var(--body); background: #fff8e8; font-size: 13px; }

.about-hero { display: grid; grid-template-columns: 1fr 1fr; align-items: end; gap: 48px; }
.about-hero .eyebrow { grid-column: 1 / -1; }.about-hero h1 { margin-bottom: 0; }.about-hero > p:last-child { font-size: 18px; }
.about-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--hairline); }
.about-grid article { padding: 32px; background: var(--surface-card); }
.about-grid span { color: var(--primary); font-size: 13px; font-weight: 700; letter-spacing: 1.5px; }.about-grid h2 { margin: 32px 0 12px; font-size: 20px; }.about-grid p { margin-bottom: 0; color: var(--body); font-size: 14px; }
.source-panel { margin-top: 80px; padding: 48px; background: var(--surface-soft); }
.source-panel ul { margin: 32px 0 0; padding: 0; list-style: none; }
.source-panel li { display: flex; justify-content: space-between; gap: 32px; padding: 20px 0; border-top: 1px solid var(--hairline-strong); }
.source-panel li a { color: var(--ink); font-weight: 700; }.source-panel li a:hover { color: var(--primary); }.source-panel li span { color: var(--muted); font-size: 13px; text-align: right; }

.admin-panel { padding: 32px; border: 1px solid var(--hairline); background: var(--surface-soft); }
.admin-panel h2 { font-size: 24px; }.field-help { color: var(--muted); font-size: 14px; }
.admin-password { max-width: 380px; margin-bottom: 24px; }.admin-panel textarea { min-height: 520px; resize: vertical; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; }
.admin-actions { display: flex; align-items: center; gap: 24px; margin-top: 24px; }.admin-actions p { margin: 0; color: var(--body-strong); font-weight: 400; }

footer { padding: 64px max(32px, calc((100% - 1440px) / 2)); color: var(--body); background: var(--surface-soft); }
.footer-inner { display: grid; grid-template-columns: 1.4fr 1fr; gap: 64px; }.footer-inner strong { font-size: 24px; }.footer-inner p { max-width: 560px; margin: 12px 0 0; color: var(--muted); font-size: 14px; }
.footer-links { display: grid; grid-template-columns: 1fr; align-content: start; gap: 14px; }.footer-links a { color: var(--body); font-size: 14px; font-weight: 400; text-decoration: none; }.footer-links a:hover { color: var(--primary); }
.copyright { margin: 48px 0 0; padding-top: 24px; border-top: 1px solid var(--hairline-strong); color: var(--muted); font-size: 12px; }

@media (max-width: 1024px) {
    .header-inner, main { width: min(100% - 40px, 1440px); }
    .home-hero { grid-template-columns: 1fr; }.hero-visual { min-height: 380px; }.hero-copy { padding: 64px 48px; }
    .quick-grid { grid-template-columns: repeat(2, 1fr); }.event-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .mission-panel { grid-template-columns: 1fr; padding: 64px 48px; }
    .filter-panel { grid-template-columns: repeat(2, 1fr); }.filter-panel label:first-child { grid-column: 1 / -1; }
    .detail-grid { grid-template-columns: 1fr; }.about-grid { grid-template-columns: 1fr; }
}

@media (max-width: 767px) {
    header, .header-inner { height: 64px; }
    .header-inner, main { width: min(100% - 24px, 1440px); }
    .brand small, .desktop-nav { display: none; }
    .mobile-menu { display: block; position: relative; }
    .mobile-menu summary { padding: 12px 0; color: var(--ink); font-size: 13px; font-weight: 700; letter-spacing: 1.5px; list-style: none; text-transform: uppercase; cursor: pointer; }
    .mobile-menu summary::-webkit-details-marker { display: none; }
    .mobile-menu summary::after { content: "+"; margin-left: 10px; color: var(--primary); }
    .mobile-menu[open] summary::after { content: "−"; }
    .mobile-menu nav { position: fixed; inset: 64px 0 0; display: flex; align-items: stretch; flex-direction: column; gap: 0; padding: 32px 24px; background: var(--canvas); }
    .mobile-menu nav a { padding: 20px 0; border-bottom: 1px solid var(--hairline); font-size: 20px; font-weight: 700; }
    .mobile-menu nav a::after { display: none; }
    main { padding-top: 24px; }
    .home-hero { min-height: 0; }.hero-copy { padding: 48px 24px; }.hero-copy h1 { font-size: 40px; }.hero-copy > p:not(.eyebrow) { font-size: 16px; }
    .hero-visual { min-height: 300px; }.sun { top: 48px; right: 48px; width: 84px; height: 84px; }
    .hero-actions { align-items: stretch; flex-direction: column; }.hero-actions .button { width: 100%; }
    .section-heading { align-items: flex-start; flex-direction: column; }.quick-section, .weekend-section { padding-top: 64px; }
    .quick-grid, .event-grid, .calendar-cards, .map-list { grid-template-columns: 1fr; }.quick-grid a { min-height: 152px; }
    .mission-panel { margin-top: 64px; padding: 48px 24px; }
    .page-hero { margin-bottom: 32px; padding: 48px 24px; }.page-hero h1 { font-size: 40px; }
    .filter-panel { grid-template-columns: 1fr; }.filter-panel label:first-child { grid-column: auto; }
    .results-toolbar { align-items: flex-start; flex-direction: column; gap: 16px; }.view-switch { width: 100%; justify-content: space-between; }
    .calendar-day { grid-template-columns: 1fr; }.calendar-day h2 { position: static; }.map-event { align-items: flex-start; flex-direction: column; }
    .detail-hero { padding: 48px 24px; }.detail-hero h1 { font-size: 40px; }.detail-card { padding: 24px; }.detail-list > div { grid-template-columns: 1fr; gap: 4px; }
    .detail-actions { flex-direction: column; }.detail-actions .button { width: 100%; }
    .about-hero { grid-template-columns: 1fr; }.about-hero .eyebrow { grid-column: auto; }.source-panel { margin-top: 64px; padding: 32px 24px; }.source-panel li { flex-direction: column; }.source-panel li span { text-align: left; }
    .admin-panel { padding: 24px; }.admin-panel textarea { min-height: 440px; }
    .footer-inner { grid-template-columns: 1fr; gap: 40px; }
}