/*
Theme Name: TH System Support
Theme URI: https://th-ss.co.jp
Author: TH System Support Co., Ltd.
Author URI: https://th-ss.co.jp
Description: THシステムサポート株式会社 コーポレートサイト専用カスタムテーマ。医療・介護向けICTソリューション企業のブランドイメージを体現するTech-Compassionデザイン。
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.9
Requires PHP: 8.0
License: Proprietary
License URI: https://th-ss.co.jp
Text Domain: th-system-support
Tags: corporate, custom-theme, japanese

Design Philosophy: Tech-Compassion — Human-Centered Technology × Scandinavian Minimalism
Primary Color: #07294f (Dark Navy)
Accent Color: #2563eb (Bright Blue)
Font: Noto Sans JP + DM Sans
*/

/* ===================================
   CSS Custom Properties (Design Tokens)
   =================================== */
:root {
  --color-primary: #07294f;
  --color-primary-light: #0a3a6e;
  --color-accent: #2563eb;
  --color-accent-light: #3b82f6;
  --color-bg: #ffffff;
  --color-bg-light: #f4f8fd;
  --color-bg-blue: #e8f2fc;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-text-light: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-blue: #bfdbfe;
  --color-white: #ffffff;

  --font-sans: 'Noto Sans JP', sans-serif;
  --font-en: 'DM Sans', sans-serif;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.1), 0 4px 8px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 50px rgba(0,0,0,0.12), 0 8px 16px rgba(0,0,0,0.06);

  --transition: 0.25s ease;
  --transition-slow: 0.5s ease;

  --container-max: 1280px;
  --container-pad: clamp(1.25rem, 4vw, 3rem);
}

/* ===================================
   Reset & Base
   =================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* ===================================
   Layout Utilities
   =================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

.section {
  padding: 5rem 0;
}

.section--lg {
  padding: 7rem 0;
}

/* ===================================
   Typography
   =================================== */
.section-label {
  font-family: var(--font-en);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-label::before {
  content: '';
  display: block;
  width: 2rem;
  height: 2px;
  background: currentColor;
  opacity: 0.5;
  flex-shrink: 0;
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-top: 1rem;
}

.section-desc {
  color: var(--color-text-muted);
  max-width: 42rem;
  line-height: 1.8;
  margin-top: 1rem;
}

/* ===================================
   Buttons
   =================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  border-radius: var(--radius-full);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.9375rem;
  line-height: 1;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-white);
  color: var(--color-primary);
}

.btn-primary:hover {
  background: #f0f7ff;
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border: 2px solid rgba(255,255,255,0.6);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
}

.btn-dark {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-dark:hover {
  background: var(--color-primary-light);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

/* ===================================
   Animations
   =================================== */
.fade-in-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.fade-in-up.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delays */
.fade-in-up:nth-child(1) { transition-delay: 0s; }
.fade-in-up:nth-child(2) { transition-delay: 0.1s; }
.fade-in-up:nth-child(3) { transition-delay: 0.2s; }
.fade-in-up:nth-child(4) { transition-delay: 0.3s; }
.fade-in-up:nth-child(5) { transition-delay: 0.4s; }

/* ===================================
   Header
   =================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1.25rem 0;
  transition: background var(--transition), padding var(--transition), box-shadow var(--transition);
}

.site-header.is-scrolled {
  background: var(--color-primary);
  padding: 0.75rem 0;
  box-shadow: 0 2px 20px rgba(7,41,79,0.3);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-logo img {
  height: 2.5rem;
  width: auto;
  filter: brightness(0) invert(1);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.site-nav a {
  color: rgba(255,255,255,0.85);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  position: relative;
  transition: color var(--transition);
}

.site-nav a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-white);
  transition: width var(--transition);
}

.site-nav a:hover {
  color: var(--color-white);
}

.site-nav a:hover::after {
  width: 100%;
}

.header-cta {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.header-tel {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  color: rgba(255,255,255,0.75);
  font-size: 0.8125rem;
  font-weight: 500;
  transition: color var(--transition);
}

.header-tel:hover {
  color: var(--color-white);
}

.header-tel svg {
  width: 14px;
  height: 14px;
}

.header-contact-btn {
  background: var(--color-white);
  color: var(--color-primary);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 700;
  transition: all var(--transition);
}

.header-contact-btn:hover {
  background: #f0f7ff;
  box-shadow: var(--shadow-md);
}

/* Mobile Menu */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  transition: all var(--transition);
}

.mobile-menu {
  display: none;
  background: var(--color-primary);
  border-top: 1px solid rgba(255,255,255,0.1);
}

.mobile-menu.is-open {
  display: block;
}

.mobile-nav {
  padding: 1rem 0;
}

.mobile-nav a {
  display: block;
  color: rgba(255,255,255,0.85);
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 0.75rem 1.5rem;
  transition: all var(--transition);
}

.mobile-nav a:hover {
  color: var(--color-white);
  background: rgba(255,255,255,0.08);
}

.mobile-nav-cta {
  padding: 1rem 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.mobile-nav-cta .btn-primary {
  width: 100%;
  background: var(--color-white);
  color: var(--color-primary);
}

/* ===================================
   Footer
   =================================== */
.site-footer {
  background: var(--color-primary);
  color: var(--color-white);
}

.footer-main {
  padding: 3.5rem 0;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 2.5rem;
}

.footer-brand .site-logo img {
  height: 2.5rem;
  margin-bottom: 1rem;
}

.footer-brand p {
  color: rgba(255,255,255,0.55);
  font-size: 0.875rem;
  line-height: 1.8;
}

.footer-nav-title,
.footer-contact-title {
  font-family: var(--font-en);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 1.25rem;
}

.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer-nav a {
  color: rgba(255,255,255,0.65);
  font-size: 0.875rem;
  transition: color var(--transition);
}

.footer-nav a:hover {
  color: var(--color-white);
}

.footer-contact-info {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  color: rgba(255,255,255,0.65);
  font-size: 0.875rem;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 1.5rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-copyright {
  color: rgba(255,255,255,0.35);
  font-size: 0.75rem;
}

.footer-legal {
  display: flex;
  gap: 1.25rem;
}

.footer-legal a {
  color: rgba(255,255,255,0.35);
  font-size: 0.75rem;
  transition: color var(--transition);
}

.footer-legal a:hover {
  color: rgba(255,255,255,0.65);
}

/* ===================================
   Responsive
   =================================== */
@media (max-width: 1023px) {
  .site-nav,
  .header-cta {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .footer-main {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 639px) {
  .footer-main {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}