/* ==========================================================================
   Seinankai Official Website - Design System & Custom Stylesheet
   ========================================================================== */

/* Curated HSL Palette & Theme Tokens */
:root {
  /* Branding Colors */
  --primary: #1e5c35;         /* Forest Green - inherited from seinankai.net */
  --primary-rgb: 30, 92, 53;
  --secondary: #0d2440;       /* Deep Navy - academic depth of MPD */
  --secondary-rgb: 13, 36, 64;
  --accent: #c9a227;          /* Premium Gold - achievements & strategy */
  --accent-rgb: 201, 162, 39;
  
  /* Neutral Colors */
  --bg-light: #f0f7f2;        /* Soft Sage Pale White - alternate background */
  --text-dark: #1a1a1a;       /* High Contrast Charcoal */
  --text-muted: #555555;
  --white: #ffffff;
  --white-translucent: rgba(255, 255, 255, 0.85);

  /* Shadows & Layout Settings */
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 12px 28px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 30px rgba(201, 162, 39, 0.3);
  
  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.2s ease;
  --border-radius-sm: 6px;
  --border-radius-md: 12px;
  --border-radius-lg: 20px;
}

/* ==========================================================================
   1. Reset & Global Styles
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 80px; /* Offset for sticky header */
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Noto Sans JP', 'Hiragino Kaku Gothic Pro', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-dark);
  background-color: var(--white);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-fast);
}

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 700;
  line-height: 1.3;
}

/* Base Fade-in animation class */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Helper Utilities */
.text-center {
  text-align: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  text-align: center;
  border-radius: var(--border-radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition-smooth);
  gap: 0.5rem;
}

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

.btn-primary:hover {
  background-color: var(--white);
  color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-accent {
  background-color: var(--accent);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(201, 162, 39, 0.3);
}

.btn-accent:hover {
  background-color: var(--white);
  color: #a4811d;
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn-large {
  padding: 1.1rem 2.5rem;
  font-size: 1.1rem;
}

/* ==========================================================================
   2. Header & Sticky Glassmorphism Navigation
   ========================================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  transition: var(--transition-smooth);
  background-color: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(0px);
}

.header.scrolled {
  background-color: var(--white-translucent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  padding: 0.5rem 0;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  width: 100%;
}

.logo {
  display: flex;
  flex-direction: column;
  position: relative;
}

.logo-main {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--primary);
  letter-spacing: 0.05em;
  line-height: 1.1;
}

.logo-sub {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: lowercase;
  letter-spacing: 0.15em;
}

.logo-badge {
  font-size: 0.6rem;
  background-color: var(--accent);
  color: var(--white);
  padding: 1px 6px;
  border-radius: 3px;
  font-weight: 700;
  position: absolute;
  top: -6px;
  right: -70px;
  letter-spacing: 0.02em;
}

/* Official Logo Image Styles */
.logo-image {
  height: 48px;
  width: auto;
  display: block;
  transition: var(--transition-smooth);
  border-radius: 6px;
}

.header.scrolled .logo-image {
  height: 40px;
}

.footer-logo-image {
  height: 52px;
  width: auto;
  display: block;
  margin: 0 auto 0.5rem auto;
  border-radius: 6px;
  transition: var(--transition-smooth);
}

.footer-logo-image:hover,
.logo-image:hover {
  transform: scale(1.03);
  box-shadow: 0 4px 12px rgba(30, 92, 53, 0.15);
}

/* Custom Text Links */
.text-link {
  transition: var(--transition-fast);
}

.text-link:hover {
  color: var(--accent) !important;
  text-decoration: underline;
}

.nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  gap: 1.2rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--secondary);
  position: relative;
  padding: 0.4rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent);
  transition: var(--transition-fast);
}

.nav-link:hover {
  color: var(--accent);
}

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

/* Hamburger Icon for Mobile */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 101;
}

.hamburger-bar {
  width: 100%;
  height: 2px;
  background-color: var(--secondary);
  transition: var(--transition-smooth);
}

/* Hamburger open state */
.hamburger.open .hamburger-bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.hamburger.open .hamburger-bar:nth-child(2) {
  opacity: 0;
}

.hamburger.open .hamburger-bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Nav Overlay */
.mobile-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: rgba(13, 36, 64, 0.96);
  backdrop-filter: blur(10px);
  z-index: 99;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition-smooth);
}

.mobile-nav-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.8rem;
}

.mobile-nav-link {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--white);
}

.mobile-nav-link:hover {
  color: var(--accent);
}

/* ==========================================================================
   3. Hero Section with Academic Rich Backgrounds
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: radial-gradient(circle at 0% 100%, rgba(30, 92, 53, 0.45) 0%, rgba(13, 36, 64, 1) 70%);
  color: var(--white);
  padding: 120px 2rem 60px;
  overflow: hidden;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  z-index: 10;
}

.hero-content {
  max-width: 780px;
}

.hero-title {
  font-size: 3.5rem;
  margin-bottom: 2rem;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.hero-title .highlight {
  color: var(--accent);
  position: relative;
  display: inline-block;
}

.hero-title .highlight::after {
  content: '';
  position: absolute;
  bottom: 8px;
  left: 0;
  width: 100%;
  height: 6px;
  background-color: rgba(201, 162, 39, 0.2);
  z-index: -1;
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: 3rem;
  line-height: 2;
  color: rgba(255, 255, 255, 0.85);
  font-weight: 400;
}

.hero-actions {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 4rem;
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 0.05em;
}

.meta-divider {
  color: rgba(255, 255, 255, 0.3);
}

/* Background animated glow orbs */
.glow-element {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  z-index: 1;
  pointer-events: none;
  opacity: 0.6;
}

.glow-1 {
  width: 400px;
  height: 400px;
  background: var(--primary);
  top: -100px;
  right: -50px;
  animation: glowFloat 12s infinite alternate ease-in-out;
}

.glow-2 {
  width: 300px;
  height: 300px;
  background: var(--accent);
  bottom: -50px;
  left: 40%;
  animation: glowFloat 16s infinite alternate-reverse ease-in-out;
}

@keyframes glowFloat {
  0% { transform: translateY(0) scale(1); }
  100% { transform: translateY(40px) scale(1.15); }
}

/* ==========================================================================
   4. Common Section Layout
   ========================================================================== */
.section {
  padding: 8rem 2rem;
}

.section-container {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.section-header {
  text-align: center;
  margin-bottom: 5rem;
}

.section-tag {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 0.8rem;
}

.section-title {
  font-size: 2.25rem;
  color: var(--secondary);
  letter-spacing: -0.02em;
  font-weight: 900;
}

.title-underline {
  width: 40px;
  height: 3px;
  background-color: var(--accent);
  margin: 1.5rem auto 0;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 700px;
  margin: 1.5rem auto 0;
}

/* Grid System for 3 Columns */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}

.card {
  background-color: var(--white);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
  height: 100%;
  border: 1px solid rgba(0, 0, 0, 0.03);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

/* ==========================================================================
   5. About Section & Operational Team Box
   ========================================================================== */
.about-section {
  background-color: var(--white);
}

.about-card {
  padding: 3rem 2rem;
}

.card-border-top {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background-color: var(--primary);
}

.card-icon-wrapper {
  width: 60px;
  height: 60px;
  border-radius: var(--border-radius-sm);
  background-color: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 2rem;
}

.card-icon {
  width: 28px;
  height: 28px;
}

.card-title {
  font-size: 1.4rem;
  color: var(--secondary);
  margin-bottom: 1.2rem;
}

.card-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.8;
}

.operational-team-box {
  margin-top: 5rem;
  background-color: var(--bg-light);
  border-radius: var(--border-radius-lg);
  padding: 3.5rem;
  border: 1px solid rgba(30, 92, 53, 0.08);
}

.team-box-title {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--secondary);
  margin-bottom: 1rem;
  text-align: center;
}

.team-box-desc {
  font-size: 1rem;
  color: var(--text-muted);
  text-align: center;
  max-width: 800px;
  margin: 0 auto 3rem;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.team-member {
  background-color: var(--white);
  padding: 2rem;
  border-radius: var(--border-radius-md);
  border: 1px solid rgba(0, 0, 0, 0.03);
  text-align: left;
  box-shadow: var(--shadow-sm);
  width: 100%;
}

.member-role {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  text-align: center;
}

.member-name {
  display: block;
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--secondary);
  margin-bottom: 0.75rem;
  text-align: center;
}

.member-committee {
  display: block;
  font-size: 1rem;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 0.9rem;
  text-align: center;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(30, 92, 53, 0.15);
}

.member-detail {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-align: left;
}

/* ==========================================================================
   6. Activities Section & Event Calendar Box
   ========================================================================== */
.activities-section {
  background-color: var(--bg-light);
}

.activity-card {
  display: flex;
  flex-direction: column;
}

.activity-img-placeholder {
  height: 180px;
  background-color: var(--secondary);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.activity-badge {
  position: absolute;
  top: 1.2rem;
  left: 1.2rem;
  background-color: var(--primary);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.35rem 0.9rem;
  border-radius: 50px;
  letter-spacing: 0.05em;
  z-index: 10;
}

.activity-bg-icon {
  width: 100px;
  height: 100px;
}

.activity-content {
  padding: 2rem;
  background-color: var(--white);
  flex-grow: 1;
  position: relative;
}

.activity-content::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 3px;
  background-color: var(--accent);
  transition: var(--transition-smooth);
}

.activity-card:hover .activity-content::after {
  width: 100%;
}

.activity-title {
  font-size: 1.25rem;
  color: var(--secondary);
  margin-bottom: 1rem;
}

.activity-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.8;
}

/* Event Calendar Box */
.event-calendar-box {
  margin-top: 5rem;
  background-color: var(--white);
  border-radius: var(--border-radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-md);
  border: 2px solid var(--accent);
}

.calendar-header {
  margin-bottom: 2rem;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  padding-bottom: 1.5rem;
}

.calendar-badge {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 0.2rem 0.8rem;
  border-radius: 3px;
  display: inline-block;
  margin-bottom: 0.8rem;
}

.calendar-title {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--secondary);
}

.event-item {
  display: flex;
  gap: 2.5rem;
  align-items: center;
}

.event-date {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: var(--primary);
  color: var(--white);
  padding: 1.5rem;
  border-radius: var(--border-radius-md);
  min-width: 120px;
  box-shadow: var(--shadow-sm);
}

.event-day {
  font-size: 2.5rem;
  font-weight: 900;
  line-height: 1;
}

.event-month {
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-top: 0.25rem;
}

.event-info {
  flex-grow: 1;
}

.event-info .event-title {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--secondary);
  margin-bottom: 0.8rem;
}

.event-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.event-meta-info {
  display: flex;
  gap: 2rem;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary);
}

/* ==========================================================================
   7. Archives & Timeline Section
   ========================================================================== */
.archives-section {
  background-color: var(--white);
}

.timeline {
  position: relative;
  max-width: 900px;
  margin: 4rem auto 0;
  padding: 2rem 0;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  background-color: rgba(30, 92, 53, 0.15);
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  width: 50%;
  padding: 2rem;
  margin-bottom: 2rem;
}

.timeline-item:nth-child(odd) {
  left: 0;
  text-align: right;
  padding-right: 4rem;
}

.timeline-item:nth-child(even) {
  left: 50%;
  padding-left: 4rem;
}

.timeline-dot {
  position: absolute;
  top: 2.8rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--accent);
  z-index: 2;
  box-shadow: 0 0 0 4px rgba(201, 162, 39, 0.2);
}

.timeline-item:nth-child(odd) .timeline-dot {
  right: -8px;
}

.timeline-item:nth-child(even) .timeline-dot {
  left: -8px;
}

.timeline-date {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.timeline-content {
  background-color: var(--white);
  padding: 2rem;
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0, 0, 0, 0.04);
  display: inline-block;
  text-align: left;
}

.timeline-title {
  font-size: 1.15rem;
  font-weight: 900;
  color: var(--secondary);
  margin-bottom: 0.8rem;
}

.timeline-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.7;
}

/* ==========================================================================
   8. Governance & Accordion Section
   ========================================================================== */
.governance-section {
  background-color: var(--bg-light);
}

.governance-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 3rem;
  align-items: start;
}

.accordion-container {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.accordion-item {
  background-color: var(--white);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0, 0, 0, 0.02);
}

.accordion-trigger {
  width: 100%;
  padding: 1.5rem 2rem;
  background: transparent;
  border: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  outline: none;
}

.accordion-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--secondary);
  text-align: left;
}

.accordion-icon {
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--primary);
  transition: transform 0.3s ease;
}

.accordion-item.active .accordion-icon {
  transform: rotate(45deg);
}

.accordion-content {
  padding: 0 2rem;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.accordion-item.active .accordion-content {
  padding: 0 2rem 2rem;
  max-height: 500px; /* arbitrary height to slide down */
  overflow-y: auto;
}

.doc-download-card {
  background-color: var(--white);
  border-radius: var(--border-radius-lg);
  padding: 3rem 2.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(201, 162, 39, 0.2);
}

.doc-download-title {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--secondary);
  margin-bottom: 1rem;
}

.doc-download-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.doc-list {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.doc-link-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  border-radius: var(--border-radius-sm);
  border: 1px solid rgba(0, 0, 0, 0.04);
  background-color: var(--bg-light);
  font-weight: 700;
  color: var(--secondary);
  transition: var(--transition-smooth);
}

.doc-link-item:hover {
  background-color: var(--secondary);
  color: var(--white);
  border-color: var(--secondary);
  transform: translateX(4px);
}

.doc-icon {
  width: 1.4rem;
  height: 1.4rem;
  flex-shrink: 0;
}

/* ==========================================================================
   9. Admission Guide & QR Code (入会手続き)
   ========================================================================== */
.admission-section {
  background-color: var(--white);
}

.admission-ways-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3rem;
  align-items: start;
  margin-top: 3rem;
}

.admission-way-card {
  background-color: var(--white);
  border-radius: var(--border-radius-lg);
  padding: 3rem 2rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0, 0, 0, 0.03);
}

.way-title {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--secondary);
  margin-bottom: 1rem;
}

.way-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.qr-code-wrapper {
  background-color: var(--bg-light);
  padding: 2rem;
  border-radius: var(--border-radius-md);
  display: inline-block;
  margin: 0 auto;
}

.entrance-qr-code {
  max-width: 200px;
  height: auto;
  display: block;
  border: 4px solid var(--white);
  border-radius: var(--border-radius-sm);
  box-shadow: var(--shadow-sm);
}

.qr-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 1rem;
}

.form-cta-container {
  display: flex;
  justify-content: center;
}

.admission-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
  margin-top: 4rem;
}

.step-card {
  background-color: var(--white);
  border-radius: var(--border-radius-lg);
  padding: 3rem 2rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0, 0, 0, 0.03);
  text-align: center;
  position: relative;
}

.step-number {
  font-size: 3rem;
  font-weight: 900;
  color: rgba(30, 92, 53, 0.08);
  position: absolute;
  top: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  line-height: 1;
}

.step-title {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--secondary);
  margin-top: 1.5rem;
  margin-bottom: 1rem;
  position: relative;
  z-index: 10;
}

.step-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  position: relative;
  z-index: 10;
}

/* ==========================================================================
   10. Benefits Section (Checking Box system)
   ========================================================================== */
.benefits-section {
  background-color: var(--white);
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}

.benefit-box {
  background-color: var(--white);
  border-radius: var(--border-radius-md);
  padding: 2.5rem;
  border: 1px solid rgba(0, 0, 0, 0.05);
  display: flex;
  gap: 1.5rem;
  transition: var(--transition-smooth);
}

.benefit-box:hover {
  border-color: rgba(30, 92, 53, 0.2);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.benefit-icon-box {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: rgba(201, 162, 39, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-weight: bold;
  flex-shrink: 0;
}

.benefit-check {
  font-size: 1.1rem;
}

.benefit-body {
  flex-grow: 1;
}

.benefit-title {
  font-size: 1.25rem;
  color: var(--secondary);
  margin-bottom: 0.8rem;
  line-height: 1.4;
}

.benefit-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   11. Join Section (Call to Action Banner)
   ========================================================================== */
.join-section {
  background: linear-gradient(135deg, var(--secondary) 0%, #173860 100%);
  color: var(--white);
  padding: 7rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.join-container {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 10;
}

.join-title {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
}

.join-text {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.9;
  margin-bottom: 3.5rem;
}

.join-action {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.join-hint {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
}

/* ==========================================================================
   12. Contact Section (Smart Forms)
   ========================================================================== */
.contact-section {
  background-color: var(--white);
}

.contact-form-wrapper {
  max-width: 680px;
  margin: 0 auto;
  background-color: var(--white);
  padding: 4rem;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(0, 0, 0, 0.02);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.form-label {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--secondary);
}

.form-label .required {
  color: #d93838;
  margin-left: 0.2rem;
}

.form-control {
  font-family: inherit;
  font-size: 1rem;
  padding: 0.9rem 1.2rem;
  border: 2px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--border-radius-sm);
  background-color: var(--white);
  transition: var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(30, 92, 53, 0.1);
}

.form-control::placeholder {
  color: rgba(0, 0, 0, 0.25);
}

.form-textarea {
  min-height: 180px;
  resize: vertical;
}

.form-action {
  margin-top: 1rem;
}

.btn-submit {
  width: 100%;
  padding: 1.1rem;
}

/* ==========================================================================
   13. Footer Layout & Legal Document Links
   ========================================================================== */
.footer {
  background-color: var(--secondary);
  color: var(--white);
  padding: 5rem 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3rem;
  width: 100%;
}

.footer-brand {
  text-align: center;
}

.footer-logo {
  display: flex;
  flex-direction: column;
  margin-bottom: 0.5rem;
}

.footer-logo .logo-main {
  color: var(--white);
  font-size: 1.8rem;
  font-weight: 900;
}

.footer-logo .logo-sub {
  color: rgba(255, 255, 255, 0.4);
}

.footer-desc {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 0.05em;
}

.footer-nav-list {
  display: flex;
  gap: 2.5rem;
}

.footer-link {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 700;
}

.footer-link:hover {
  color: var(--accent);
}

.footer-legal-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 2rem;
  width: 100%;
  max-width: 900px;
}

.footer-legal-link {
  color: rgba(255, 255, 255, 0.75);
  transition: var(--transition-fast);
}

.footer-legal-link:hover {
  color: var(--accent);
}

.legal-divider {
  color: rgba(255, 255, 255, 0.2);
}

.footer-copyright {
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.4);
  letter-spacing: 0.02em;
}

/* ==========================================================================
   14. Responsive Layout Controls (Media Queries)
   ========================================================================== */
@media screen and (max-width: 992px) {
  .card-grid, .benefits-grid, .team-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }

  .governance-grid, .admission-ways-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .timeline::before {
    left: 20px;
  }

  .timeline-item {
    width: 100%;
    padding-left: 3.5rem;
    padding-right: 0 !important;
    text-align: left !important;
  }

  .timeline-item:nth-child(even) {
    left: 0;
  }

  .timeline-dot {
    left: 12px !important;
    right: auto !important;
  }
}

@media screen and (max-width: 768px) {
  html {
    font-size: 15px;
  }

  .header-container {
    padding: 1rem 1.5rem;
  }

  .nav {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .hero {
    padding: 120px 1.5rem 60px;
  }

  .hero-title {
    font-size: 2.4rem;
    line-height: 1.4;
  }

  .hero-subtitle {
    font-size: 1.1rem;
    line-height: 1.8;
  }

  .hero-actions {
    flex-direction: column;
    gap: 1rem;
    width: 100%;
  }

  .section {
    padding: 5rem 1.5rem;
  }

  .section-header {
    margin-bottom: 3.5rem;
  }

  .card-grid, .benefits-grid, .team-grid, .admission-steps {
    grid-template-columns: 1fr;
    gap: 1.8rem;
  }

  .about-card {
    padding: 2.5rem 1.5rem;
  }

  .operational-team-box {
    padding: 2rem 1.5rem;
  }

  .event-calendar-box {
    padding: 2rem 1.5rem;
  }

  .event-item {
    flex-direction: column;
    align-items: stretch;
    gap: 1.5rem;
  }

  .event-date {
    width: 100%;
  }

  .benefit-box {
    padding: 2rem;
  }

  .step-card {
    padding: 2rem 1.5rem;
  }

  .doc-download-card {
    padding: 2rem 1.5rem;
  }

  .join-title {
    font-size: 2rem;
  }

  .join-text {
    font-size: 1rem;
  }

  .btn-large {
    width: 100%;
    padding: 1rem 1.5rem;
  }

  .contact-form-wrapper {
    padding: 2.5rem 1.5rem;
  }

  .footer-nav-list {
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
  }
}

/* ==========================================================================
   15. Sub-page Custom Styles (Officers & Members)
   ========================================================================== */
.sub-hero {
  min-height: 40vh !important;
  background: radial-gradient(circle at center, #1e5c35 0%, #0c1a30 70%, #050d18 100%) !important;
  padding: 160px 2rem 80px !important;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.sub-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at center, rgba(30, 92, 53, 0.25) 0%, transparent 70%);
  pointer-events: none;
  z-index: 1;
}

.sub-hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100px;
  background: linear-gradient(to top, var(--white), transparent);
  pointer-events: none;
  z-index: 2;
}

.sub-hero-container {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 10;
}

.sub-hero-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 1rem;
  color: var(--accent);
}

.sub-hero-title {
  font-size: 3rem;
  font-weight: 900;
  color: var(--white) !important;
  margin-bottom: 1.5rem;
  line-height: 1.35;
  letter-spacing: -0.01em;
  text-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
}

.sub-hero-subtitle {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.85) !important;
  line-height: 1.8;
  max-width: 720px;
  margin: 0 auto;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.officer-img-wrapper {
  height: 220px;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--secondary);
}

.officer-concept-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.officer-card:hover .officer-concept-img {
  transform: scale(1.08);
}

.officer-concept-badge {
  position: absolute;
  bottom: 12px;
  right: 12px;
  color: var(--white);
  padding: 4px 14px;
  font-size: 0.8rem;
  font-weight: 800;
  border-radius: 50px;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 10;
}

.officer-meta {
  margin-top: 1.5rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  border-top: 1px solid rgba(0, 0, 0, 0.06);
  padding-top: 1rem;
}

.branch-directors-box {
  margin-top: 5rem;
  background-color: var(--white);
  border-radius: var(--border-radius-lg);
  padding: 3.5rem;
  border: 1px solid rgba(201, 162, 39, 0.2);
  box-shadow: var(--shadow-sm);
}

.benefits-detail-section {
  background-color: var(--white);
}

.nav-link.active {
  color: var(--accent) !important;
}
.nav-link.active::after {
  width: 100% !important;
}

/* ==========================================================================
   16. 極上ガラスモーフィズムThanksモーダル
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(6, 17, 32, 0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--border-radius-lg);
  padding: 48px 40px;
  max-width: 500px;
  width: 90%;
  text-align: center;
  box-shadow: 0 20px 50px rgba(13, 36, 64, 0.2), 0 0 45px rgba(201, 162, 39, 0.2);
  transform: translateY(30px);
  transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
  position: relative;
  overflow: hidden;
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

.modal-icon {
  font-size: 48px;
  margin-bottom: 20px;
  display: inline-block;
  animation: iconBounce 1s infinite alternate ease-in-out;
}

@keyframes iconBounce {
  0% { transform: translateY(0); }
  100% { transform: translateY(-8px); }
}

.modal-header h3 {
  font-size: 24px;
  color: var(--secondary);
  margin-bottom: 16px;
  font-weight: 900;
}

.modal-body {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 32px;
  line-height: 1.7;
}

.modal-close-btn {
  background-color: var(--primary);
  color: var(--white);
  border: none;
  padding: 10px 32px;
  font-weight: 700;
  font-size: 15px;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.modal-close-btn:hover {
  background-color: var(--white);
  color: var(--primary);
  border: 2px solid var(--primary);
}

/* ==========================================================================
   14. 極上ガラスモーフィズムThanksモーダル
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(6, 17, 32, 0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition-smooth);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--border-radius-lg);
  padding: 48px 40px;
  max-width: 500px;
  width: 90%;
  text-align: center;
  box-shadow: 0 20px 50px rgba(13, 36, 64, 0.2), 0 0 45px rgba(201, 162, 39, 0.2);
  transform: translateY(30px);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

.modal-icon {
  font-size: 48px;
  margin-bottom: 20px;
  display: inline-block;
  animation: iconBounce 1s infinite alternate ease-in-out;
}

@keyframes iconBounce {
  0% { transform: translateY(0); }
  100% { transform: translateY(-8px); }
}

.modal-header h3 {
  font-size: 24px;
  color: var(--secondary);
  margin-bottom: 16px;
  font-weight: 900;
}

.modal-body {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 32px;
  line-height: 1.7;
}

.modal-close-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  text-align: center;
  border-radius: var(--border-radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition-smooth);
  gap: 0.5rem;
  background-color: var(--primary);
  color: var(--white);
  padding: 10px 32px;
  font-size: 15px;
}

.modal-close-btn:hover {
  background-color: var(--white);
  color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ==========================================================================
   17. 運営委員概要カード アバター表示・重ね合わせ用カスタムスタイル
   ========================================================================== */
.officer-bg-blur {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-size: cover;
  background-position: center;
  filter: blur(2px); /* ぼかしを少し弱めて背景グラフィックのディテールを活かす */
  transform: scale(1.08); /* にじみ防止のスケール */
  transition: transform 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
  z-index: 1;
}

.officer-card:hover .officer-bg-blur {
  transform: scale(1.15);
}

.officer-bg-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(13, 36, 64, 0.35); /* アバターを際立たせるための半透明ブルーレイヤー */
  z-index: 2;
}

.officer-avatar-group {
  position: relative;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}

.officer-avatar {
  width: 140px; /* アバターサイズを大幅にアップ（100px -> 140px） */
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--white); /* 白枠を太く（3px -> 4px） */
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35); /* 影をより深く */
  transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.officer-avatar-group.multiple {
  gap: 0;
}

.officer-avatar-group.multiple .officer-avatar {
  width: 120px; /* 複数アバターサイズもアップ（90px -> 120px） */
  height: 120px;
}

.officer-avatar-group.multiple .officer-avatar:nth-child(1) {
  position: relative;
  z-index: 2;
}

.officer-avatar-group.multiple .officer-avatar:nth-child(2) {
  position: relative;
  z-index: 1;
  margin-left: -30px; /* サイズアップに合わせて重ね合わせ幅を調整 */
}

/* ホバー時のアバターアニメーション効果 */
.officer-card:hover .officer-avatar {
  transform: scale(1.06);
}

.officer-card:hover .officer-avatar-group.multiple .officer-avatar:nth-child(1) {
  transform: translateX(-8px) scale(1.06); /* スプレッド効果を少し強調 */
}

.officer-card:hover .officer-avatar-group.multiple .officer-avatar:nth-child(2) {
  transform: translateX(8px) scale(1.06);
}