:root {
  --color-bg: #f4f3ef;
  --color-text: #2b2927;
  --color-heading: #2b2927;
  --color-link: #234a66;
  --color-button: #b14a2b;
  --color-button-hover: #963d24;
  --color-link-hover: #18364b;
  --color-border: #d9d6cf;
  --color-white: #fff;
  --color-black: #000;
  --color-transparent: transparent;

  --font-heading: "Noto Serif JP", serif;
  --font-body: "Noto Sans JP", sans-serif;
  --font-number: "Montserrat", "Noto Sans JP", sans-serif;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-size-h1: clamp(36px, 4vw, 56px);
  --font-size-lead: clamp(18px, 1.6vw, 22px);
  --font-size-button: 16px;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 40px;
  --space-6: 48px;
  --space-7: 56px;
  --space-8: 64px;
  --space-9: 72px;
  --space-10: 80px;
  --space-11: 96px;
  --space-12: 120px;

  --container-max: 1280px;
  --container-text: 760px;
  --container-narrow: 800px;
  --container-padding-desktop: 80px;
  --container-padding-tablet: 32px;
  --container-padding-mobile: 24px;

  --radius-none: 0;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-round: 9999px;

  --border-thin: 1px solid var(--color-border);
  --border-brand: 2px solid var(--color-button);

  --shadow-none: none;
  --shadow-sm: 0 2px 6px rgb(0 0 0 / 6%);
  --shadow-md: 0 8px 24px rgb(0 0 0 / 8%);

  --z-base: 1;
  --z-content: 10;
  --z-header: 100;
  --z-overlay: 500;
  --z-menu: 900;
  --z-modal: 1000;

  --duration-fast: 0.2s;
  --duration-normal: 0.3s;
  --duration-slow: 0.5s;
  --ease-standard: ease;
  --ease-in-out: ease-in-out;
  --ease-motion: cubic-bezier(0.22, 1, 0.36, 1);

  --opacity-disabled: 0.4;
  --opacity-overlay: 0.6;
  --opacity-hover: 0.9;

  --header-height-desktop: 88px;
  --header-height-desktop-scrolled: 72px;
  --header-height-mobile: 72px;
  --header-height-mobile-scrolled: 64px;
  --header-logo-height-desktop: 48px;
  --header-logo-height-desktop-scrolled: 40px;
  --header-logo-height-mobile: 38px;
  --header-contact-height: 48px;
  --header-contact-padding-inline: 24px;
  --nav-gap-desktop: 32px;
  --nav-gap-laptop: 24px;
  --menu-button-size: 48px;
  --menu-icon-size: 26px;
  --menu-line-width: 2px;
  --menu-item-min-height: 56px;
  --focus-ring-width: 3px;
  --focus-ring-offset: 3px;
  --header-backdrop-blur: 8px;
  --header-scrolled-bg: rgb(244 243 239 / 96%);

  --button-height: 56px;
  --button-min-width: 200px;
  --button-padding-desktop: 32px;
  --button-padding-mobile: 24px;
  --text-link-height: 44px;
  --icon-shift: 4px;

  --hero-min-height-desktop: 720px;
  --hero-min-height-mobile: 680px;
  --hero-title-max-width: 720px;
  --hero-content-max-width: 760px;
  --hero-overlay-desktop-start: rgb(244 243 239 / 88%);
  --hero-overlay-desktop-middle: rgb(244 243 239 / 45%);
  --hero-overlay-desktop-end: rgb(244 243 239 / 0%);
  --hero-overlay-mobile-start: rgb(244 243 239 / 82%);
  --hero-overlay-mobile-middle: rgb(244 243 239 / 36%);
  --hero-overlay-mobile-end: rgb(244 243 239 / 0%);
  --hero-object-position-desktop: 35% 50%;
  --hero-object-position-tablet: 50% 50%;
  --hero-object-position-mobile: 58% 50%;
  --hero-fade-duration: 0.6s;
  --hero-scroll-line-height: 48px;

  --font-size-section-label: 13px;
  --font-size-h2: clamp(30px, 3vw, 44px);
  --font-size-h3: clamp(24px, 1.875vw, 30px);
  --font-size-card-title: clamp(20px, 1.8vw, 24px);
  --font-size-body: 16px;
  --font-size-caption: 14px;
  --section-padding-desktop: 120px;
  --section-padding-tablet: 96px;
  --section-padding-mobile: 72px;
  --about-copy-width: 520px;
  --about-main-aspect-desktop: 16 / 10;
  --about-main-aspect-mobile: 4 / 5;
  --about-sub-aspect: 16 / 9;
  --about-main-object-position: 50% 50%;
  --about-design-object-position: 52% 50%;
  --about-test-object-position: 50% 50%;
  --reveal-distance: 24px;
  --reveal-duration: 0.6s;
  --font-size-technology-lead: clamp(24px, 2vw, 32px);
  --font-size-stat-value: clamp(42px, 4.2vw, 64px);
  --font-size-stat-unit: clamp(16px, 1.5vw, 22px);
  --technology-main-aspect-desktop: 16 / 9;
  --technology-main-aspect-mobile: 4 / 5;
  --technology-sub-aspect: 16 / 9;
  --technology-pull-position-desktop: center 58%;
  --technology-pull-position-mobile: 48% 55%;
  --technology-overview-position: center 52%;
  --technology-ridge-position: center center;
  --font-size-tiroof-catch: clamp(24px, 2.25vw, 34px);
  --font-size-tiroof-value: clamp(20px, 1.6vw, 24px);
  --tiroof-image-aspect-desktop: 4 / 5;
  --tiroof-image-aspect-mobile: 4 / 5;
  --tiroof-image-position-desktop: center 55%;
  --tiroof-image-position-mobile: 52% 56%;
  --tiroof-accent-width: 3px;
  --roof-card-aspect: 16 / 9;
  --roof-card-hover-lift: -4px;
  --roof-card-hover-scale: 1.03;
  --roof-card-role-position: center center;
  --roof-card-types-position: center center;
  --roof-card-history-position: center 48%;
  --roof-card-trouble-position: center 52%;
  --purpose-card-aspect: 16 / 9;
  --purpose-line-width: 2px;
  --purpose-card-bg-hover: #f9f7f2;
  --news-card-aspect: 16 / 9;
  --news-card-hover-scale: 1.03;
  --news-line-width: 2px;
  --news-title-lines: 2;
  --footer-brand-line-width: 2px;
  --footer-text-muted: rgb(43 41 39 / 70%);
  --footer-border-color: var(--color-border);
  --footer-focus-color: var(--color-link);
  --footer-logo-height-desktop: 60px;
  --footer-logo-height-mobile: 36px;
}