@charset "utf-8";

/* ============================================
   DESIGN TOKENS
   design-system.html / SPECIFICATION.md の値を正とする
   ============================================ */
:root {
    /* Colors — Primary (Blue) */
    --color-primary: #0857AA;
    --color-primary-dark: #043d7a;
    --color-primary-light: #1a6fc2;
    /* Colors — Accent (Blue) */
    --color-accent: #0a6ec8;
    --color-accent-light: #4d9de6;
    --color-accent-dark: #044d96;
    /* Colors — Secondary / CTA (Orange) */
    --color-secondary: #F29A44;
    --color-secondary-light: #F5B06A;
    --color-secondary-dark: #D4832C;
    /* Colors — Neutral */
    --color-white: #ffffff;
    --color-gray-50: #f8f9fb;
    --color-gray-100: #f0f2f5;
    --color-gray-200: #e2e6ec;
    --color-gray-300: #cdd3dc;
    --color-gray-400: #9ba4b4;
    --color-gray-500: #6e7a8e;
    --color-gray-600: #4a5568;
    --color-gray-700: #2d3748;
    --color-gray-800: #1a202c;
    --color-gray-900: #0d1117;
    /* Colors — Text */
    --color-text: #111111;
    --color-text-secondary: #4a5568;
    --color-text-muted: #9ba4b4;
    --color-text-inverse: #ffffff;
    /* Colors — Background */
    --color-bg: #ffffff;
    --color-bg-subtle: #f8f9fb;
    --color-bg-muted: #f0f2f5;
    --color-bg-dark: #051d3a;
    --color-bg-darker: #031226;
    /* Colors — Border */
    --color-border: #e2e6ec;
    --color-border-light: #f0f2f5;
    --color-border-dark: rgba(255, 255, 255, 0.1);
    /* Colors — Semantic */
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;
    /* Typography — Font Family */
    --font-display: "Outfit", sans-serif;
    --font-body: "Roboto", sans-serif;
    --font-jp: "Noto Sans JP", sans-serif;
    /* Typography — Font Size */
    --text-xs: 11px;
    --text-sm: 13px;
    --text-base: 15px;
    --text-md: 16px;
    --text-lg: 18px;
    --text-xl: 20px;
    --text-2xl: 24px;
    --text-3xl: 30px;
    --text-4xl: 36px;
    --text-5xl: 48px;
    --text-6xl: 60px;
    --text-hero: 72px;
    /* Typography — Font Weight */
    --weight-light: 300;
    --weight-regular: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;
    /* Typography — Line Height */
    --leading-none: 1;
    --leading-tight: 1.2;
    --leading-snug: 1.35;
    --leading-normal: 1.5;
    --leading-relaxed: 1.7;
    --leading-loose: 2;
    /* Typography — Letter Spacing */
    --tracking-tight: -0.02em;
    --tracking-normal: 0;
    --tracking-wide: 0.025em;
    --tracking-wider: 0.05em;
    --tracking-widest: 0.1em;
    --tracking-caps: 0.15em;
    /* Spacing */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-7: 28px;
    --space-8: 32px;
    --space-9: 36px;
    --space-10: 40px;
    --space-12: 48px;
    --space-14: 56px;
    --space-16: 64px;
    --space-20: 80px;
    --space-24: 96px;
    --space-32: 128px;
    /* Section Spacing */
    --section-gap: 120px;
    --section-gap-md: 80px;
    --section-gap-sm: 56px;
    /* Container */
    --container-max: 1200px;
    --container-narrow: 900px;
    --container-wide: 1400px;
    --container-px: 40px;
    /* Border Radius */
    --radius-sm: 3px;
    --radius-md: 5px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    --radius-pill: 100px;
    --radius-full: 50%;
    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.14);
    --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 6px 24px rgba(0,0,0,0.06);
    --shadow-card-hover: 0 4px 12px rgba(0,0,0,0.06), 0 12px 40px rgba(0,0,0,0.1);
    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --duration-fast: 0.15s;
    --duration-base: 0.25s;
    --duration-slow: 0.4s;
    --transition: 0.3s var(--ease-out);
    --transition-slow: 0.5s var(--ease-out);
    /* Z-Index */
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-header: 500;
    --z-overlay: 900;
    --z-modal: 1000;
}

/* ============================================
   BASE
   ============================================ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
    font-family: var(--font-body);
    font-weight: var(--weight-regular);
    line-height: var(--leading-relaxed);
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; height: auto; vertical-align: bottom; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--transition); }
ul, ol { list-style: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }

/* ============================================
   LAYOUT
   ============================================ */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-px);
}
.container--narrow { max-width: var(--container-narrow); }
.container--wide { max-width: var(--container-wide); }

/* ============================================
   HEADER
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-header);
    transition: background var(--transition-slow), box-shadow var(--transition-slow);
}
.header--transparent { background: transparent; }
.header--solid {
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 var(--color-border);
}
.header_inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--container-px);
    height: 80px;
    transition: height var(--transition-slow);
}
/* ロゴ（SVG画像切替） */
.header_logo {
    display: block;
    position: relative;
    width: 214px;
    height: 50px;
    flex-shrink: 0;
}
.header_logo img {
    position: absolute;
    top: 0;
    left: 0;
    height: 50px;
    width: auto;
    transition: opacity var(--transition-slow);
}
.header_logo-white { opacity: 1; }
.header_logo-color { opacity: 0; }
.header--solid .header_logo-white { opacity: 0; }
.header--solid .header_logo-color { opacity: 1; }
/* ナビゲーション */
.header_nav {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}
.header_nav-link {
    font-size: var(--text-base);
    font-weight: var(--weight-medium);
    color: rgba(255,255,255,0.85);
    transition: color var(--transition-slow);
    position: relative;
}
.header--solid .header_nav-link { color: var(--color-text-secondary); }
.header_nav-link:hover { color: var(--color-white); }
.header--solid .header_nav-link:hover { color: var(--color-accent); }
.header_nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
    border-radius: 1px;
}
.header_nav-link:hover::after { transform: scaleX(1); }
/* ドロップダウン */
.header_dropdown {
    position: relative;
}
.header_dropdown > .header_nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}
.header_dropdown > .header_nav-link::after { display: none; }
.header_chevron {
    display: inline-block;
    width: 16px;
    height: 16px;
    transition: transform var(--transition);
}
.header_chevron svg {
    width: 16px;
    height: 16px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}
.header_dropdown:hover .header_chevron { transform: rotate(180deg); }
.header_dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding-top: var(--space-3);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition);
}
.header_dropdown:hover .header_dropdown-menu {
    opacity: 1;
    visibility: visible;
}
.header_dropdown-list {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    min-width: 220px;
    padding: var(--space-2) 0;
    border: 1px solid var(--color-border);
}
.header_dropdown-link {
    display: block;
    padding: var(--space-3) var(--space-5);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--color-text-secondary);
    transition: background var(--transition), color var(--transition);
}
.header_dropdown-link:hover {
    background: var(--color-bg-subtle);
    color: var(--color-primary);
}
/* 言語切替 */
.header_lang {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-left: var(--space-4);
    padding-left: var(--space-4);
    border-left: 1px solid rgba(255,255,255,0.2);
}
.header--solid .header_lang { border-left-color: var(--color-border); }
.header_lang a {
    font-size: var(--text-sm);
    color: rgba(255,255,255,0.4);
    transition: color var(--transition-slow);
}
.header_lang a:hover { color: var(--color-white); }
.header--solid .header_lang a { color: var(--color-text-muted); }
.header--solid .header_lang a:hover { color: var(--color-accent); }
.header_lang a.current { color: var(--color-white); font-weight: var(--weight-medium); }
.header--solid .header_lang a.current { color: var(--color-primary); }
.header_lang-sep { color: rgba(255,255,255,0.2); font-size: var(--text-sm); }
.header--solid .header_lang-sep { color: var(--color-border); }
/* モバイルハンバーガー */
.header_hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 28px;
    padding: 4px 0;
    cursor: pointer;
    background: none;
    border: none;
}
.header_hamburger span {
    display: block;
    height: 2px;
    background: var(--color-white);
    border-radius: 1px;
    transition: all var(--transition);
}
.header--solid .header_hamburger span { background: var(--color-text); }
/* ヘッダーCTAボタン */
.header_cta {
    margin-left: var(--space-4);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-family: var(--font-body);
    font-size: var(--text-base);
    font-weight: var(--weight-medium);
    line-height: 1;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    border: 1.5px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
    letter-spacing: var(--tracking-wide);
}
.btn:active { transform: scale(0.98); }
/* Primary */
.btn--primary {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}
.btn--primary:hover {
    background: var(--color-primary-light);
    border-color: var(--color-primary-light);
    box-shadow: 0 4px 12px rgba(8, 87, 170, 0.25);
}
/* Accent */
.btn--accent {
    background: var(--color-accent);
    color: var(--color-white);
    border-color: var(--color-accent);
}
.btn--accent:hover {
    background: var(--color-accent-dark);
    border-color: var(--color-accent-dark);
    box-shadow: 0 4px 12px rgba(10, 110, 200, 0.3);
}
/* Secondary / CTA */
.btn--secondary {
    background: var(--color-secondary);
    color: var(--color-white);
    border-color: var(--color-secondary);
}
.btn--secondary:hover {
    background: var(--color-secondary-dark);
    border-color: var(--color-secondary-dark);
    box-shadow: 0 4px 12px rgba(242, 154, 68, 0.3);
}
/* Outline */
.btn--outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}
.btn--outline:hover {
    background: var(--color-primary);
    color: var(--color-white);
}
/* Outline Light（ダーク背景用） */
.btn--outline-light {
    background: transparent;
    color: var(--color-white);
    border-color: rgba(255, 255, 255, 0.35);
}
.btn--outline-light:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.6);
}
/* Ghost */
.btn--ghost {
    background: transparent;
    color: var(--color-primary);
    border-color: transparent;
}
.btn--ghost:hover {
    background: var(--color-bg-muted);
}
/* White */
.btn--white {
    background: var(--color-white);
    color: var(--color-primary);
    border-color: var(--color-white);
}
.btn--white:hover {
    background: var(--color-gray-100);
    border-color: var(--color-gray-100);
}
/* サイズバリアント */
.btn--sm { font-size: var(--text-sm); padding: 10px 20px; }
.btn--lg { font-size: var(--text-md); padding: 18px 36px; }
.btn--xl { font-size: var(--text-lg); padding: 20px 44px; }
/* ボタン内アイコン */
.btn_icon {
    display: inline-flex;
    transition: transform var(--transition);
}
.btn:hover .btn_icon--arrow { transform: translateX(3px); }
/* テキストリンク */
.link-more {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-family: var(--font-body);
    font-size: var(--text-base);
    font-weight: var(--weight-medium);
    color: var(--color-accent);
    letter-spacing: var(--tracking-wide);
}
.link-more_arrow {
    display: inline-flex;
    transition: transform var(--transition);
}
.link-more:hover .link-more_arrow { transform: translateX(4px); }
.link-more:hover { color: var(--color-accent-dark); }

/* ============================================
   SECTION HEADERS
   ============================================ */
.section-header { margin-bottom: var(--space-14); }
.section-header--center { text-align: center; }
.section-label {
    display: inline-block;
    font-family: var(--font-display);
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
    letter-spacing: var(--tracking-caps);
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--space-3);
}
.section-label--light { color: var(--color-accent-light); }
.section-title {
    font-family: var(--font-display);
    font-size: var(--text-4xl);
    font-weight: var(--weight-semibold);
    line-height: var(--leading-tight);
    color: var(--color-text);
    letter-spacing: var(--tracking-tight);
}
.section-title--light { color: var(--color-white); }
.section-title--md { font-size: var(--text-3xl); }
.section-lead {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
    color: var(--color-text-secondary);
    margin-top: var(--space-5);
    max-width: 600px;
}
.section-lead--light { color: rgba(255,255,255,0.65); }
.section-header--center .section-lead { margin-left: auto; margin-right: auto; }

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--color-bg-dark);
    color: rgba(255, 255, 255, 0.7);
    padding: var(--space-20) 0 var(--space-10);
}
.footer_grid {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--space-20);
    padding-bottom: var(--space-14);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.footer_brand-logo {
    margin-bottom: var(--space-5);
}
.footer_brand-logo img {
    height: 40px;
    width: auto;
}
.footer_brand-desc {
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
    color: rgba(255, 255, 255, 0.5);
}
.footer_nav {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-10);
}
.footer_nav-title {
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    color: var(--color-white);
    letter-spacing: var(--tracking-wider);
    margin-bottom: var(--space-4);
}
.footer_nav-item { margin-bottom: var(--space-2); }
.footer_nav-item a {
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.5);
}
.footer_nav-item a:hover { color: var(--color-accent-light); }
.footer_bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-8);
    font-size: var(--text-xs);
    color: rgba(255, 255, 255, 0.4);
}
.footer_bottom-links {
    display: flex;
    gap: var(--space-6);
}
.footer_bottom-links a {
    color: rgba(255, 255, 255, 0.4);
    font-size: var(--text-xs);
}
.footer_bottom-links a:hover { color: var(--color-accent-light); }

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}
.fade-up.is-visible {
    opacity: 1;
    transform: translateY(0);
}