:root{--color-bg: #ffffff;--color-bg-secondary: #f3f8fb;--color-surface: #ffffff;--color-surface-alt: #eaf4fa;--color-border: #d7e4ec;--color-primary: #eaf4fa;--color-accent: #16739b;--color-accent-light: #115e80;--color-accent-dark: #115e80;--color-text: #243746;--color-text-muted: #596e7e;--color-text-on-accent: #ffffff;--gradient-accent: #16739b;--gradient-hero: #f0f8fc;--font-sans: "Inter", "Roboto", system-ui, -apple-system, sans-serif;--font-jp: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-lg: 1.125rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--text-3xl: 1.875rem;--text-4xl: 2.25rem;--text-5xl: 3rem;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-16: 4rem;--space-20: 5rem;--space-24: 6rem;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px;--radius-full: 9999px;--shadow-sm: none;--shadow-md: none;--shadow-lg: none;--shadow-accent: none;--transition-fast: .15s ease;--transition-base: .25s ease;--transition-slow: .4s ease;--container-max: 1200px;--header-height: 64px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:auto;font-size:16px;-webkit-text-size-adjust:100%}body{font-family:var(--font-jp),var(--font-sans);background-color:var(--color-bg);color:var(--color-text);line-height:1.6;min-height:100vh;display:flex;flex-direction:column;overflow-x:hidden}img,svg{display:block;max-width:100%}a{color:var(--color-accent);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-accent-light)}a:focus-visible{outline:2px solid var(--color-accent);outline-offset:3px;border-radius:var(--radius-sm)}ul,ol{list-style:none}button{cursor:pointer;font-family:inherit;border:none;background:none}h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.3;letter-spacing:-.01em}.container{width:100%;max-width:var(--container-max);margin-inline:auto;padding-inline:var(--space-4)}@media (min-width: 640px){.container{padding-inline:var(--space-6)}}@media (min-width: 1024px){.container{padding-inline:var(--space-8)}}main{flex:1;padding-top:var(--header-height)}.site-header{position:fixed;top:0;left:0;right:0;z-index:100;height:var(--header-height);background-color:transparent;transition:background-color var(--transition-base),box-shadow var(--transition-base),backdrop-filter var(--transition-base)}.site-header.scrolled{background-color:#fff;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:0 1px 0 var(--color-border),var(--shadow-md)}.header-inner{display:flex;align-items:center;justify-content:space-between;height:100%;gap:var(--space-6)}.site-logo{flex-shrink:0;white-space:nowrap;font-size:var(--text-xl);font-weight:700;font-family:var(--font-sans);letter-spacing:-.02em;background:var(--gradient-accent);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;transition:opacity var(--transition-fast)}.site-logo:hover{opacity:.85;color:inherit}.nav-menu{display:none;align-items:center;gap:var(--space-1)}@media (min-width: 768px){.nav-menu{display:flex}}.nav-link{display:inline-flex;align-items:center;padding:var(--space-2) var(--space-4);color:var(--color-text-muted);font-size:var(--text-sm);font-weight:500;border-radius:var(--radius-md);transition:color var(--transition-fast),background-color var(--transition-fast);text-decoration:none}.nav-link:hover,.nav-link.active{color:var(--color-text);background-color:#ffffff0f}.nav-link.active{color:var(--color-accent)}.nav-cta{display:none;margin-left:var(--space-4)}@media (min-width: 768px){.nav-cta{display:inline-flex}}.hamburger{display:flex;flex-direction:column;justify-content:center;align-items:center;width:44px;height:44px;gap:5px;border-radius:var(--radius-md);background:transparent;transition:background-color var(--transition-fast);flex-shrink:0}.hamburger:hover{background-color:#ffffff14}.hamburger:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.hamburger-line{display:block;width:22px;height:2px;background-color:var(--color-text);border-radius:2px;transition:transform var(--transition-base),opacity var(--transition-base)}.hamburger[aria-expanded=true] .hamburger-line:nth-child(1){transform:translateY(7px) rotate(45deg)}.hamburger[aria-expanded=true] .hamburger-line:nth-child(2){opacity:0;transform:scaleX(0)}.hamburger[aria-expanded=true] .hamburger-line:nth-child(3){transform:translateY(-7px) rotate(-45deg)}@media (min-width: 768px){.hamburger{display:none}}.mobile-nav{position:fixed;top:var(--header-height);left:0;right:0;background-color:#fff;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--color-border);padding:var(--space-4) var(--space-4) var(--space-6);z-index:99;transform:translateY(-8px);opacity:0;pointer-events:none;transition:transform var(--transition-base),opacity var(--transition-base)}.mobile-nav.open{transform:translateY(0);opacity:1;pointer-events:auto}.mobile-nav-list{display:flex;flex-direction:column;gap:var(--space-1)}.mobile-nav-link{display:flex;align-items:center;padding:var(--space-3) var(--space-4);color:var(--color-text-muted);font-size:var(--text-base);font-weight:500;border-radius:var(--radius-md);transition:color var(--transition-fast),background-color var(--transition-fast);text-decoration:none;min-height:44px}.mobile-nav-link:hover,.mobile-nav-link.active{color:var(--color-text);background-color:#ffffff0f}.mobile-nav-link.active{color:var(--color-accent)}.site-footer{background-color:var(--color-bg-secondary);border-top:1px solid var(--color-border);padding:var(--space-8) 0;margin-top:auto}.footer-inner{display:flex;flex-direction:column;align-items:center;gap:var(--space-4);text-align:center}@media (min-width: 640px){.footer-inner{flex-direction:row;justify-content:space-between;text-align:left}}.footer-brand{font-size:var(--text-lg);font-weight:700;font-family:var(--font-sans);background:var(--gradient-accent);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.footer-copy{font-size:var(--text-sm);color:var(--color-text-muted)}.footer-links{display:flex;align-items:center;gap:var(--space-4)}.footer-link{font-size:var(--text-sm);color:var(--color-text-muted);transition:color var(--transition-fast);text-decoration:none}.footer-link:hover{color:var(--color-accent)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-3) var(--space-6);font-size:var(--text-sm);font-weight:600;font-family:inherit;border-radius:var(--radius-md);border:1.5px solid transparent;cursor:pointer;transition:transform var(--transition-fast),box-shadow var(--transition-fast),background-color var(--transition-fast),border-color var(--transition-fast);text-decoration:none;min-height:44px;white-space:nowrap}.btn:active{transform:translateY(1px)}.btn-primary{background:var(--gradient-accent);color:var(--color-text-on-accent);border-color:transparent}.btn-primary:hover{box-shadow:var(--shadow-accent);opacity:.92;color:var(--color-text-on-accent)}.btn-outline{background:transparent;color:var(--color-accent);border-color:var(--color-accent)}.btn-outline:hover{background-color:#00d4ff14;box-shadow:var(--shadow-accent);color:var(--color-accent-light);border-color:var(--color-accent-light)}.section-title{font-size:var(--text-2xl);font-weight:700;color:var(--color-text);margin-bottom:var(--space-2)}@media (min-width: 768px){.section-title{font-size:var(--text-3xl)}}.section-subtitle{font-size:var(--text-base);color:var(--color-text-muted);margin-bottom:var(--space-10)}.section-header{text-align:center;margin-bottom:var(--space-12)}.accent-line{display:inline-block;width:48px;height:3px;background:var(--gradient-accent);border-radius:var(--radius-full);margin-bottom:var(--space-4)}.page-hero{padding:var(--space-20) 0 var(--space-16);background:linear-gradient(180deg,var(--color-bg-secondary) 0%,var(--color-bg) 100%);border-bottom:1px solid var(--color-border);text-align:center}.page-hero-title{font-size:var(--text-3xl);color:var(--color-text);margin-bottom:var(--space-3)}@media (min-width: 768px){.page-hero-title{font-size:var(--text-4xl)}}.page-hero-desc{font-size:var(--text-base);color:var(--color-text-muted);max-width:600px;margin-inline:auto}.coming-soon-section{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:300px;padding:var(--space-16) var(--space-4);text-align:center}.coming-soon-section p{color:var(--color-text-muted);font-size:var(--text-lg)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.text-accent{color:var(--color-accent)}.text-muted{color:var(--color-text-muted)}.section{padding:var(--space-20) 0}@media (min-width: 768px){.section{padding:var(--space-24) 0}}.fade-in-up{opacity:0;transform:translateY(30px);transition:opacity .6s ease-out,transform .6s ease-out}.fade-in-up.visible{opacity:1;transform:translateY(0)}@media (prefers-reduced-motion: reduce){.fade-in-up{opacity:1;transform:none;transition:none}}:root{--radius-lg: 4px;--radius-xl: 4px;--radius-md: 4px}.site-header,.site-header.scrolled{background:#fff;border-bottom:1px solid var(--color-border);box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none}.site-logo,.footer-brand{background:none;-webkit-text-fill-color:currentColor;color:#243746;letter-spacing:.02em}.site-logo:before{content:"";display:inline-block;width:8px;height:20px;background:#7fc8e8;margin-right:10px;vertical-align:-2px}.nav-link:hover,.nav-link.active,.mobile-nav-link:hover,.mobile-nav-link.active,.hamburger:hover{background:#eef7fc}.btn-primary{background:#16739b;color:#fff}.btn-primary:hover{background:#115e80;color:#fff;opacity:1;box-shadow:none}.btn-outline:hover{background:#eef7fc;box-shadow:none}.section-header{text-align:left;margin-bottom:36px}.section-subtitle{margin-bottom:0}.accent-line{background:#7fc8e8;width:32px;height:3px}.page-hero{background:#f0f8fc;text-align:left;padding:56px 0}.page-hero-desc{margin-inline:0;line-height:1.9}.fade-in-up,.fade-in-up.visible{opacity:1;transform:none;transition:none}.mobile-nav{background:#fff;-webkit-backdrop-filter:none;backdrop-filter:none}button:focus-visible{outline:2px solid #16739b;outline-offset:3px}body .portfolio-card:hover{transform:none;box-shadow:none;border-color:#91bfd4}body .avatar-wrapper{border:1px solid #c7dfe9;box-shadow:none}body .timeline:before{background:#c7dfe9}.timeline-item:before,body .timeline-item:first-child:before{box-shadow:none}body .skill-badge:hover{box-shadow:none}.form-error,.field-error,.form-message.error,.required-mark{color:#b42318}.form-message.success{color:#176b42}@media (prefers-reduced-motion: reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}body .form-status.success{color:#176b42}body .form-status.error,body .form-status .error-mail-link,body .form-status .error-mail-link:hover,body .field-error,body .form-required,body .form-label .required{color:#b42318}body .contact-link:hover{transform:none}.btn.nav-cta{display:none}@media (min-width: 768px){.btn.nav-cta{display:inline-flex}}.page-hero{text-align:center}.page-hero-desc{margin-inline:auto}