/* ==========================================
   KomeKaigi 2026 Teaser
   Minimal holding page — warm paddy palette
   ========================================== */

:root {
    --color-primary: #fabe00;
    --color-primary-dark: #d9a200;
    --color-ink: #2A2E35;
    --color-paper: #f7f3e8;   /* 米・和紙のクリーム */
    --color-paper-soft: #f0ebdb;
    --color-muted: rgba(42, 46, 53, 0.6);
    --color-line: rgba(42, 46, 53, 0.12);

    --font-sans: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-serif: 'Merriweather', Georgia, serif;
    --font-mono: 'JetBrains Mono', 'SFMono-Regular', Menlo, Consolas, monospace;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: var(--font-sans);
    color: var(--color-ink);
    background: var(--color-paper);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

/* ==========================================
   Header
   ========================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 30;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem clamp(1.25rem, 4vw, 2.5rem);
    background: transparent;
}

.site-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    opacity: 0.85;
    transition: opacity 0.2s ease;
}

.site-brand:hover {
    opacity: 1;
}

.site-brand-logo {
    height: 32px;
    width: auto;
}

.site-brand-text {
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    letter-spacing: 0.03em;
}

/* Hamburger button */
.menu-toggle {
    width: 40px;
    height: 40px;
    padding: 0;
    background: transparent;
    border: none;
    cursor: pointer;
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 6px;
}

.menu-toggle-bar {
    display: block;
    width: 22px;
    height: 1.5px;
    background: var(--color-ink);
    transition: transform 0.25s ease, opacity 0.2s ease;
}

.menu-toggle[aria-expanded='true'] .menu-toggle-bar:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}
.menu-toggle[aria-expanded='true'] .menu-toggle-bar:nth-child(2) {
    opacity: 0;
}
.menu-toggle[aria-expanded='true'] .menu-toggle-bar:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* ==========================================
   Slide-in menu
   ========================================== */
.site-menu {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(380px, 86vw);
    z-index: 20;
    background: var(--color-paper-soft);
    border-left: 1px solid var(--color-line);
    transform: translateX(105%);
    transition: transform 0.3s ease;
    padding: 5.5rem 2rem 2rem;
    overflow-y: auto;
}

.site-menu[aria-hidden='false'] {
    transform: translateX(0);
}

.site-menu-inner {
    display: flex;
    flex-direction: column;
}

.site-menu-label {
    margin: 1.75rem 0 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--color-primary-dark);
    font-weight: 500;
}

.site-menu-label:first-child {
    margin-top: 0;
}

.site-menu-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.site-menu-list a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.9rem 0;
    border-bottom: 1px solid var(--color-line);
    font-size: 1rem;
    color: var(--color-ink);
    transition: color 0.2s ease;
}

.site-menu-list a:hover {
    color: var(--color-primary-dark);
}

.site-menu-arrow {
    font-size: 1rem;
    opacity: 0.5;
}

/* ==========================================
   Hero
   ========================================== */
.hero {
    position: relative;
    flex: 1 1 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6rem 1.5rem 4rem;
    min-height: 100vh;
    overflow: hidden;
}

.hero-stalks {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    color: var(--color-primary);
    opacity: 0.45;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    padding: 0 clamp(1rem, 8vw, 6rem);
}

.hero-stalks svg {
    width: clamp(60px, 10vw, 110px);
    height: auto;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
}

.hero-logo {
    width: clamp(200px, 40vw, 360px);
    height: auto;
    margin-bottom: 1.25rem;
}

.hero-kicker {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    margin: 0;
    font-family: var(--font-mono);
    font-size: clamp(0.82rem, 1.6vw, 0.95rem);
    font-weight: 500;
    letter-spacing: 0.26em;
    text-transform: uppercase;
    color: var(--color-primary-dark);
}

.hero-kicker-rule {
    display: inline-block;
    width: clamp(32px, 6vw, 60px);
    height: 1px;
    background: var(--color-primary-dark);
    opacity: 0.7;
}

.hero-title {
    margin: 0;
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: clamp(2.75rem, 8vw, 5rem);
    letter-spacing: 0.02em;
    color: var(--color-ink);
    line-height: 1.15;
}

.hero-lead {
    margin: 0;
    max-width: 34em;
    font-family: var(--font-sans);
    font-size: clamp(1.05rem, 2.6vw, 1.3rem);
    font-weight: 400;
    line-height: 2;
    color: var(--color-ink);
    opacity: 0.88;
}

.hero-lead br {
    display: none;
}

@media (min-width: 560px) {
    .hero-lead br {
        display: inline;
    }
}

.hero-tag {
    margin: 0;
    font-family: var(--font-mono);
    font-size: clamp(0.95rem, 1.8vw, 1.1rem);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-muted);
}

/* ==========================================
   Footer
   ========================================== */
.site-footer {
    position: relative;
    z-index: 1;
    padding: 1.5rem;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--color-muted);
}

/* ==========================================
   Responsive
   ========================================== */
@media (max-width: 640px) {
    .hero {
        padding: 5rem 1.25rem 3.5rem;
    }

    .hero-stalks {
        padding: 0 1rem;
        opacity: 0.35;
    }
}