.site-header{position:sticky;top:0;z-index:100;background:var(--header-bg);color:var(--header-fg);box-shadow:0 1px #ffffff0d}.header-inner{display:flex;align-items:center;height:var(--header-height);gap:var(--space-5)}.header-logo{font-size:var(--font-size-lg);font-weight:600;color:var(--header-fg);text-decoration:none;letter-spacing:0;flex-shrink:0;transition:opacity var(--transition-fast)}.header-logo:hover{opacity:.8}.header-nav{display:flex;align-items:center;gap:var(--space-1);flex:1}.header-nav-link{padding:var(--space-2) var(--space-3);color:var(--header-fg-muted);font-size:var(--font-size-sm);font-weight:500;border-radius:var(--radius-sm);transition:color var(--transition-fast),background var(--transition-fast);white-space:nowrap}.header-nav-link:hover{color:var(--header-fg);background:#ffffff14}.header-nav-link[aria-current=page]{color:var(--header-fg)}.header-nav-lang{display:none}.header-controls{display:flex;align-items:center;gap:var(--space-3);margin-left:auto}.lang-picker{display:flex;align-items:center;gap:var(--space-1)}.lang-link{padding:var(--space-1) var(--space-2);color:var(--header-fg-muted);font-size:var(--font-size-xs);font-weight:600;letter-spacing:.05em;border-radius:var(--radius-sm);transition:color var(--transition-fast),background var(--transition-fast);text-decoration:none}.lang-link:hover{color:var(--header-fg);background:#ffffff14}.lang-link--active{color:var(--header-fg)}.theme-toggle,.hamburger{width:2.5rem;height:2.5rem;padding:0;border:1px solid rgba(255,255,255,.14);border-radius:var(--radius-md);background:#ffffff08;color:var(--header-fg-muted);transition:color var(--transition-fast),border-color var(--transition-fast),background var(--transition-fast),transform var(--transition-fast)}.theme-toggle{display:inline-flex;align-items:center;justify-content:center}.theme-icon{display:flex;align-items:center;justify-content:center;line-height:1}.theme-icon svg{width:16px;height:16px}.theme-icon--sun,html.dark-mode .theme-icon--moon{display:none}html.dark-mode .theme-icon--sun{display:block}.theme-toggle:hover,.hamburger:hover{color:var(--header-fg);border-color:#ffffff47;background:#ffffff14;transform:translateY(-1px)}.theme-toggle:active,.hamburger:active{transform:translateY(0)}.hamburger{display:none;align-items:center;justify-content:center;flex-direction:column;gap:.24rem}.hamburger-line{width:1rem;height:1.5px;border-radius:999px;background:currentColor;transition:transform var(--transition-fast),opacity var(--transition-fast);transform-origin:center}.hamburger[aria-expanded=true] .hamburger-line:nth-child(1){transform:translateY(.39rem) rotate(45deg)}.hamburger[aria-expanded=true] .hamburger-line:nth-child(2){opacity:0}.hamburger[aria-expanded=true] .hamburger-line:nth-child(3){transform:translateY(-.39rem) rotate(-45deg)}@media(max-width:768px){.site-header[data-mobile-open=true]{box-shadow:0 1px #ffffff0d,0 16px 28px #00000029}.header-nav{position:absolute;top:var(--header-height);left:0;right:0;display:none;flex:none;flex-direction:column;align-items:stretch;gap:var(--space-2);padding:var(--space-5) var(--container-pad);background:var(--header-bg);border-top:1px solid rgba(255,255,255,.08);box-shadow:inset 0 1px #ffffff0a}.site-header[data-mobile-open=true] .header-nav{display:flex}.header-nav-link{padding:var(--space-3);font-size:var(--font-size-md);border-radius:var(--radius-md)}.header-nav-link[aria-current=page]{background:#ffffff0f}.header-nav-lang{display:flex;gap:var(--space-2);padding:var(--space-3) var(--space-2) 0;border-top:1px solid rgba(255,255,255,.1)}.lang-picker{display:none}.hamburger{display:flex}}.site-footer{background:linear-gradient(180deg,var(--color-surface),var(--color-surface-2));border-top:1px solid var(--color-border);margin-top:auto}.footer-inner{padding-block:var(--space-9) var(--space-6)}.footer-top{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(10rem,12rem) auto;gap:var(--space-8);align-items:start;margin-bottom:var(--space-8)}.footer-logo{font-size:var(--font-size-lg);font-weight:600;color:var(--color-text);text-decoration:none;display:block;margin-bottom:var(--space-3)}.footer-tagline{font-size:var(--font-size-sm);color:var(--color-text-muted);max-width:30ch;line-height:1.6}.footer-nav{display:grid;gap:var(--space-2);align-content:start}.footer-nav-link{display:inline-flex;align-items:center;color:var(--color-text-muted);font-size:var(--font-size-sm);transition:color var(--transition-fast)}.footer-nav-link:hover{color:var(--color-text)}.footer-social-label{font-size:var(--font-size-sm);font-weight:500;letter-spacing:.02em;color:var(--color-text-muted);margin-bottom:var(--space-3)}.footer-social-links{display:flex;gap:var(--space-2)}.footer-social-link{align-items:center;justify-content:center;width:2.5rem;height:2.5rem;border:1px solid var(--color-border);border-radius:var(--radius-md);background:#ffffff59;color:var(--color-text-muted);transition:color var(--transition-fast),transform var(--transition-fast);display:flex;position:relative}.footer-social-link:hover{color:var(--color-text);border-color:color-mix(in srgb,var(--color-text-muted) 50%,var(--color-border));background:var(--color-surface);transform:translateY(-2px)}.footer-bottom{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--color-border);padding-top:var(--space-5);gap:var(--space-4);flex-wrap:wrap}.footer-copyright{font-size:var(--font-size-sm);color:var(--color-text-muted)}.footer-policy-links{display:flex;gap:var(--space-4);align-items:center;flex-wrap:wrap}.footer-policy-link{font-size:var(--font-size-sm);color:var(--color-text-muted)}.footer-policy-link:hover{color:var(--color-text)}@media(max-width:768px){.footer-top{grid-template-columns:1fr;gap:var(--space-6)}.footer-nav{grid-template-columns:repeat(2,minmax(0,max-content));gap:var(--space-2) var(--space-5)}}:root{--color-bg: #f6f5f1;--color-surface: #ffffff;--color-surface-2: #efeee8;--color-border: #d8d6cd;--color-text: #23221e;--color-text-muted: #69665f;--color-primary: #2566d4;--color-primary-hover:#1e56b5;--color-accent: #0f3c8a;--color-accent-hover: #0b2f6b;--header-bg: #001433;--header-fg: #e8eaf0;--header-fg-muted: #9ba3bf;--header-height: 64px;--hero-bg-from: #001433;--hero-bg-to: #002266;--hero-bg-mid: #002060;--playground-bg: #0c1a32;--playground-text: #e8eaf0;--cta-gradient-to: #003a99;--font-sans: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", YuGothic, Meiryo, sans-serif;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-base: 1rem;--font-size-md: 1.125rem;--font-size-lg: 1.25rem;--font-size-xl: 1.5rem;--font-size-2xl: 1.875rem;--font-size-3xl: 2.25rem;--font-size-4xl: 3rem;--font-size-hero: clamp(2rem, 5vw, 3.5rem);--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.5rem;--space-6: 2rem;--space-7: 3rem;--space-8: 4rem;--space-9: 6rem;--space-10: 8rem;--container: 1200px;--container-pad: clamp(1rem, 5vw, 2rem);--radius-sm: 4px;--radius-md: 8px;--radius-lg: 16px;--radius-xl: 24px;--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-slow: .4s ease;--shadow-sm: 0 1px 3px rgba(0,0,0,.08);--shadow-md: 0 4px 12px rgba(0,0,0,.1);--shadow-lg: 0 8px 24px rgba(0,0,0,.12);--shadow-card: 0 0 0 1px rgba(17,20,31,.06), 0 10px 24px rgba(17,20,31,.04)}html.dark-mode{--color-bg: #0d0d1a;--color-surface: #16162a;--color-surface-2: #1e1e35;--color-border: #2a2a42;--color-text: #e8eaf0;--color-text-muted: #7a7a9a;--color-primary: #5599ff;--color-primary-hover: #77aaff;--color-accent: #ff7733;--color-accent-hover: #ff9955;--header-bg: #070710;--shadow-card: 0 2px 8px rgba(0,0,0,.3), 0 0 0 1px rgba(255,255,255,.04);--hero-bg-from: #000306;--hero-bg-to: #000b1c;--hero-bg-mid: #000710;--playground-bg: #020408;--cta-gradient-to: #002266}*,*:before,*:after{box-sizing:border-box}html{font-size:16px;scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{margin:0;font-family:var(--font-sans);font-size:var(--font-size-base);line-height:1.75;color:var(--color-text);background-color:var(--color-bg);transition:background-color var(--transition-normal),color var(--transition-normal)}img,video{max-width:100%;height:auto;display:block}a{color:var(--color-primary);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-primary-hover)}h1,h2,h3,h4,h5,h6{margin:0;line-height:1.3;font-weight:600;letter-spacing:0}h1{font-size:var(--font-size-hero)}h2{font-size:var(--font-size-3xl)}h3{font-size:var(--font-size-xl)}p{margin:0 0 var(--space-4)}p:last-child{margin-bottom:0}ul,ol{margin:0;padding:0;list-style:none}.container{max-width:var(--container);margin-inline:auto;padding-inline:var(--container-pad)}.section{padding-block:var(--space-9)}.section-label{font-size:var(--font-size-sm);font-weight:500;letter-spacing:.06em;color:var(--color-primary);margin-bottom:var(--space-3)}.section-title{font-size:var(--font-size-3xl);margin-bottom:var(--space-5)}.skip-link{position:absolute;top:-100%;left:var(--space-4);padding:var(--space-2) var(--space-4);background:var(--color-primary);color:#fff;border-radius:var(--radius-md);font-weight:600;z-index:9999;transition:top var(--transition-fast)}.skip-link:focus{top:var(--space-2)}.btn{display:inline-flex;align-items:center;gap:var(--space-2);padding:.75rem 1.5rem;border-radius:var(--radius-md);font-size:var(--font-size-base);font-weight:600;font-family:inherit;border:2px solid transparent;cursor:pointer;text-decoration:none;transition:background-color var(--transition-fast),color var(--transition-fast),border-color var(--transition-fast),transform var(--transition-fast),box-shadow var(--transition-fast);white-space:nowrap}.btn:hover{transform:translateY(-1px)}.btn:active{transform:translateY(0)}.btn-primary{background-color:var(--color-primary);color:#fff;border-color:var(--color-primary)}.btn-primary:hover{background-color:var(--color-primary-hover);border-color:var(--color-primary-hover);color:#fff;box-shadow:0 4px 12px #2566d447}.btn-secondary{background-color:transparent;color:var(--color-text);border-color:var(--color-border)}.btn-secondary:hover{border-color:var(--color-text-muted);color:var(--color-text)}.card{background:var(--color-surface);border-radius:var(--radius-lg);padding:var(--space-6);box-shadow:var(--shadow-card);transition:box-shadow var(--transition-normal),transform var(--transition-normal)}.card:hover{box-shadow:var(--shadow-md);transform:translateY(-1px)}.page-debug-handle{position:fixed;top:50%;right:0;z-index:96;display:inline-flex;align-items:center;justify-content:center;min-width:2.75rem;min-height:9.8rem;padding:.78rem .4rem;border:1px solid rgba(255,255,255,.08);border-right:0;border-radius:.9rem 0 0 .9rem;background:#09101ee6;color:#dfe8f7;font:inherit;transform:translateY(-50%);opacity:0;cursor:pointer;transition:opacity var(--transition-normal),background-color var(--transition-fast),border-color var(--transition-fast),box-shadow var(--transition-fast);box-shadow:-12px 10px 24px #00000029}.page-debug-handle[data-visible=true]{opacity:.32}.page-debug-handle[data-drawer-open=true]{border-color:#7ab3ff70;background:#0d1628f5;box-shadow:-18px 14px 30px #0003;opacity:1}.page-debug-handle[data-release-active=true]{border-color:#7ab3ff70;background:#122034f0;color:#f4f8ff}.page-debug-handle:hover{opacity:1}.page-debug-handle-text{display:block;color:#e7eef9;font-size:.68rem;font-weight:600;letter-spacing:.05em;line-height:1.1;white-space:nowrap;writing-mode:vertical-rl;text-orientation:mixed;transform:rotate(180deg)}.page-debug-handle-label{display:none;color:#89a6cb;font-size:.68rem;font-weight:700;letter-spacing:.11em;text-transform:uppercase}.page-debug-handle-current{display:none;color:#f3f7ff;font-size:.95rem;font-weight:700;letter-spacing:.01em}@media(max-width:768px){.page-debug-handle{top:auto;right:var(--space-3);bottom:calc(var(--space-3) + 4.1rem);min-width:auto;min-height:auto;display:flex;align-items:center;gap:.45rem;padding:.6rem .9rem;border-right:1px solid rgba(255,255,255,.08);border-radius:999px;transform:none}.page-debug-handle[data-visible=true],.page-debug-handle:hover,.page-debug-handle[data-drawer-open=true]{opacity:.52}.page-debug-handle-text{display:none}.page-debug-handle-label,.page-debug-handle-current{display:block}}