/* =========================================
   WCCM - Main Stylesheet
   Design System: Navy + Red + White
   ========================================= */
@charset "UTF-8";
/*
	Theme Name: フリーブレイン
	Description: フリーブレイン
	Theme URI: http://www.fr-brain.com/
	Author: FREE　BRAIN
	Author URI: http://www.fr-brain.com/
	Version: 1.0.1
*/
/* ----- CSS Variables ----- */
:root {
  --color-navy:       #1a2a4a;
  --color-navy-dark:  #0f1e36;
  --color-navy-mid:   #243558;
  --color-red:        #e63946;
  --color-red-dark:   #c1121f;
  --color-white:      #ffffff;
  --color-gray-100:   #f5f7fa;
  --color-gray-200:   #e9ecef;
  --color-gray-300:   #ced4da;
  --color-gray-500:   #6c757d;
  --color-gray-700:   #495057;
  --color-gray-900:   #212529;
  --color-gold:       #d4af37;

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

  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-xl:  32px;

  --shadow-sm:  0 2px 8px rgba(26, 42, 74, 0.08);
  --shadow-md:  0 4px 20px rgba(26, 42, 74, 0.12);
  --shadow-lg:  0 8px 40px rgba(26, 42, 74, 0.18);
  --shadow-xl:  0 16px 60px rgba(26, 42, 74, 0.24);

  --transition: 0.3s ease;

  --container-max: 1120px;
  --container-px:  clamp(16px, 4vw, 48px);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-jp);
  color: var(--color-gray-900);
  background: var(--color-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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; }

/* ----- Container ----- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-px);
}

/* ----- Buttons ----- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-jp);
  transition: all var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-red);
  color: var(--color-white);
  border-color: var(--color-red);
}
.btn--primary:hover {
  background: var(--color-red-dark);
  border-color: var(--color-red-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(230, 57, 70, 0.35);
}

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

.btn--outline {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,0.6);
}
.btn--outline:hover {
  background: rgba(255,255,255,0.15);
  border-color: var(--color-white);
  transform: translateY(-2px);
}

.btn--outline-light {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,0.5);
}
.btn--outline-light:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--color-white);
}

.btn--full { width: 100%; justify-content: center; }

/* ----- Section Base ----- */
.section {
  padding: clamp(64px, 8vw, 100px) 0;
}

.section__header {
  text-align: center;
  margin-bottom: clamp(40px, 5vw, 64px);
}

.section__label {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-red);
  background: rgba(230, 57, 70, 0.08);
  padding: 4px 14px;
  border-radius: 100px;
  margin-bottom: 12px;
}

.section__label--light {
  color: rgba(230, 57, 70, 0.9);
  background: rgba(230, 57, 70, 0.12);
}

.section__title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 900;
  color: var(--color-navy);
  line-height: 1.2;
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}

.section__title::after {
  content: '';
  display: block;
  width: 48px;
  height: 4px;
  background: var(--color-red);
  border-radius: 2px;
  margin: 12px auto 0;
}

.section__title--light { color: var(--color-white); }
.section__title--light::after { background: var(--color-red); }

.section__desc {
  font-size: 1rem;
  color: var(--color-gray-500);
  margin-top: 16px;
}

.section__desc--light { color: rgba(255,255,255,0.75); }

.section__header--light .section__title { color: var(--color-white); }
    /**************************************************
              ヘッダーアニメーション
     /**************************************************/
    .animated-text {
      color: white;
      font-family: 'Arial', sans-serif;
      z-index: 10;
    }
    /*.animated-text {
      position: absolute;
      top: 50%;
      left: 20%;
      transform: translate(-50%, -50%);
      text-align: center;
      color: white;
      font-family: 'Arial', sans-serif;
      z-index: 10;
      width: 90%;
    }*/
    .animated-text .spacin {
      letter-spacing: 0.08em;
    }
    .animated-text .line  {
      display: block;
      font-size: 2rem;
      margin-bottom: 10px;
    }
    .animated-text .line:first-child {
      font-size: 5rem;
      font-weight: bold;
    }

    .animated-text span {
      opacity: 0;
      display: inline-block;
      animation: glowFadeIn 0.8s forwards;
      text-shadow: 0 0 10px #fff, 0 0 20px #0ff, 0 0 30px #0ff;
    }

    @keyframes glowFadeIn {
      0% {
        opacity: 0;
        text-shadow: 0 0 2px #fff;
      }
      50% {
        opacity: 1;
        text-shadow: 0 0 15px #fff, 0 0 25px #0ff;
      }
      100% {
        opacity: 1;
        text-shadow: 0 0 5px #fff;
      }
    }
    @media only screen and ( max-width : 767px ) {
    .animated-text {
      width: 90%;
    }
    .animated-text .line:first-child {
      font-size: 4rem;
      font-weight: bold;
    }
    }

/* =========================================
   NAVIGATION
   ========================================= */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(15, 30, 54, 0.95);
  /*transition: background var(--transition), box-shadow var(--transition);
  background: transparent;*/
}

.header.scrolled {
  background: rgba(15, 30, 54, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}

.nav__logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.nav__logo-icon {
  width: 40px;
  height: 40px;
  background: var(--color-red);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.nav__logo-text {
  font-family: var(--font-en);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.05em;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav__link {
  padding: 8px 14px;
  font-size: 0.88rem;
  font-weight: 500;
  color: rgba(255,255,255,0.85);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.nav__link:hover {
  color: var(--color-white);
  background: rgba(255,255,255,0.1);
}

.nav__cta {
  padding: 10px 20px;
  background: var(--color-red);
  color: var(--color-white);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 700;
  transition: all var(--transition);
  margin-left: 8px;
}

.nav__cta:hover {
  background: var(--color-red-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(230, 57, 70, 0.4);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.nav__toggle:hover { background: rgba(255,255,255,0.1); }

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

.nav__toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.active span:nth-child(2) { opacity: 0; }
.nav__toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =========================================
   HERO
   ========================================= */
.hero {
  position: relative;
  min-height: 100svh;
  background: var(--color-navy-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero__bg-canvas {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 30% 50%, rgba(230, 57, 70, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(36, 53, 88, 0.8) 0%, transparent 50%),
    linear-gradient(135deg, #0f1e36 0%, #1a2a4a 50%, #243558 100%);
}

/* ECG animated line */
.hero__bg-canvas::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 200'%3E%3Cpolyline points='0,100 100,100 140,100 160,20 180,180 200,100 240,100 340,100 380,100 400,30 420,170 440,100 480,100 580,100 620,100 640,40 660,160 680,100 720,100 820,100 860,100 880,50 900,150 920,100 960,100 1060,100 1100,100 1120,25 1140,175 1160,100 1200,100 1300,100 1340,100 1360,60 1380,140 1440,100' fill='none' stroke='rgba(230,57,70,0.15)' stroke-width='2'/%3E%3C/svg%3E");
  background-size: cover;
  background-position: center;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(15,30,54,0.3) 0%, rgba(15,30,54,0.1) 50%, rgba(15,30,54,0.5) 100%);
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 100px var(--container-px) 80px;
}

.hero__sub {
  font-size: clamp(0.85rem, 2vw, 1rem);
  color: rgba(255,255,255,0.7);
  letter-spacing: 0.15em;
  margin-bottom: 16px;
  font-weight: 400;
}

.hero__title {
  font-family: var(--font-en);
  font-size: clamp(4rem, 12vw, 9rem);
  font-weight: 700;
  color: var(--color-white);
  line-height: 1;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
  text-shadow: 0 4px 30px rgba(0,0,0,0.3);
}

.hero__title-accent {
  display: block;
  font-size: clamp(1rem, 3vw, 1.5rem);
  font-weight: 300;
  color: rgba(255,255,255,0.6);
  letter-spacing: 0.3em;
  margin-bottom: 24px;
}

.hero__desc {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: rgba(255,255,255,0.75);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

.hero__actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero__scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255,255,255,0.5);
  font-size: 1.2rem;
  animation: bounce 2s infinite;
  z-index: 2;
}

.hero__scroll:hover { color: rgba(255,255,255,0.9); }

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}

/* =========================================
   SEMINAR
   ========================================= */
.seminar { background: var(--color-white); }

.seminar__card {
  position: relative;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  margin-bottom: 32px;
  border: 1px solid var(--color-gray-200);
}

.seminar__badge {
  position: absolute;
  top: 20px;
  right: 20px;
  background: var(--color-red);
  color: white;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 100px;
  letter-spacing: 0.1em;
  z-index: 1;
}

.seminar__ended {
  position: absolute;
  top: 20px;
  right: 20px;
  background: var(--color-navy-dark);
  color: white;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 100px;
  letter-spacing: 0.1em;
  z-index: 1;
}

.seminar__inner {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  min-height: 280px;
}

.seminar__visual {
  background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-mid) 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 32px;
  gap: 20px;
}

.seminar__event-title {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.seminar__event-year {
  font-family: var(--font-en);
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  color: rgba(255,255,255,0.25);
  line-height: 1;
  letter-spacing: -0.02em;
}

.seminar__event-name {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-weight: 700;
  color: var(--color-white);
  text-align: center;
}

.seminar__ecg-line {
  width: 100%;
  max-width: 260px;
  opacity: 0.6;
}

.seminar__ecg-line svg {
  width: 100%;
  height: 40px;
}

.seminar__details {
  padding: 40px 36px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.seminar__title {
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
  font-weight: 700;
  color: var(--color-gold);
  margin-bottom: 24px;
}

.seminar__info-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 28px;
}

.seminar__info-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.seminar__info-icon {
  width: 36px;
  height: 36px;
  background: rgba(230, 57, 70, 0.08);
  color: var(--color-red);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.seminar__info-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-gray-500);
  letter-spacing: 0.05em;
  line-height: 1.2;
}

.seminar__info-value {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-gray-900);
  margin-top: 2px;
}

.seminar__notes,
.seminar__attention {
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 20px;
}

.seminar__notes {
  background: var(--color-gray-100);
  border-left: 4px solid var(--color-navy);
}

.seminar__attention {
  background: rgba(230, 57, 70, 0.04);
  border-left: 4px solid var(--color-red);
}

.seminar__notes-title,
.seminar__attention-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.seminar__notes-title {
  color: var(--color-navy);
}

.seminar__notes-title i { color: var(--color-navy); }

.seminar__attention-title {
  color: var(--color-red-dark);
}

.seminar__attention-title i { color: var(--color-red); }

.seminar__notes-list,
.seminar__attention-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.seminar__notes-list li,
.seminar__attention-list li {
  font-size: 0.9rem;
  color: var(--color-gray-700);
  padding-left: 18px;
  position: relative;
  line-height: 1.6;
}

.seminar__notes-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--color-navy);
  font-size: 0.7rem;
  top: 4px;
}

.seminar__attention-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--color-red);
  font-size: 0.7rem;
  top: 4px;
}

/* =========================================
   STREAMING
   ========================================= */
.streaming {
  background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-mid) 100%);
  position: relative;
  overflow: hidden;
}

.streaming::before {
  content: '';
  position: absolute;
  top: -100px; right: -100px;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(230,57,70,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.streaming__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.streaming__card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(8px);
}

.streaming__card-icon {
  padding: 20px 24px 0;
  font-size: 1.5rem;
  color: var(--color-red);
}

.streaming__card-img {
  padding: 16px 24px;
}

.streaming__placeholder {
  background: rgba(255,255,255,0.04);
  border: 2px dashed rgba(255,255,255,0.15);
  border-radius: var(--radius-md);
  height: 180px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: rgba(255,255,255,0.4);
}

.streaming__placeholder i { font-size: 2.5rem; }
.streaming__placeholder span { font-size: 0.85rem; }

.streaming__card-body {
  padding: 0 24px 24px;
}

.streaming__card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 10px;
}

.streaming__card-text {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.65);
  margin-bottom: 16px;
  line-height: 1.7;
}

.streaming__status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 100px;
}

.streaming__status--offline {
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.6);
}

.streaming__dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  display: inline-block;
}

.streaming__info {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.streaming__info-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 20px;
}

.streaming__info-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 20px;
  border-radius: var(--radius-md);
  transition: background var(--transition);
  margin-bottom: 4px;
}

.streaming__info-item:hover {
  background: rgba(255,255,255,0.05);
}

.streaming__info-icon {
  width: 40px; height: 40px;
  background: rgba(230, 57, 70, 0.15);
  color: var(--color-red);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.streaming__info-item strong {
  display: block;
  font-size: 0.95rem;
  color: var(--color-white);
  margin-bottom: 4px;
}

.streaming__info-item p {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.6;
}

.streaming__note {
  background: rgba(230, 57, 70, 0.1);
  border: 1px solid rgba(230, 57, 70, 0.2);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
  margin-top: 8px;
}

/* =========================================
   ABOUT
   ========================================= */
.about { background: var(--color-gray-100); }

.about__content { display: flex; flex-direction: column; gap: 48px; }

.about__main { display: flex; flex-direction: column; gap: 40px; }

.about__lead {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: clamp(28px, 4vw, 48px);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.about__ecg-deco {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 40px;
  opacity: 0.4;
}

.about__ecg-deco svg { width: 100%; height: 100%; }

.about__lead-title {
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 16px;
}

.about__lead-text {
  font-size: clamp(0.95rem, 1.5vw, 1.05rem);
  color: var(--color-gray-700);
  max-width: 900px;
  line-height: 1.9;
}

.about__cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.about__card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 28px 22px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  border-bottom: 3px solid transparent;
}

.about__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-bottom-color: var(--color-red);
}

.about__card-icon {
  width: 48px; height: 48px;
  background: rgba(26, 42, 74, 0.06);
  color: var(--color-navy);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  margin-bottom: 16px;
}

.about__card h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 10px;
}

.about__card p {
  font-size: 0.87rem;
  color: var(--color-gray-500);
  line-height: 1.7;
}

.about__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.about__stat {
  background: var(--color-navy);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 3vw, 40px);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.about__stat-number {
  font-family: var(--font-en);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--color-white);
  line-height: 1;
}

.about__stat-unit {
  font-size: 1.2rem;
  font-weight: 500;
}

.about__stat-label {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  font-weight: 500;
}

/* =========================================
   BOOKS
   ========================================= */
.books { background: var(--color-white); }

.books__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.book__card {
  position: relative;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition);
}

.book__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.book__card--featured {
  border-color: rgba(230, 57, 70, 0.2);
  box-shadow: 0 8px 40px rgba(230, 57, 70, 0.12);
}

.book__badge {
  position: absolute;
  top: 16px; left: 16px;
  background: var(--color-red);
  color: white;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 100px;
  letter-spacing: 0.1em;
  z-index: 1;
}

.book__cover {
  background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-mid) 100%);
  padding: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
}

.book__cover-inner {
  width: 140px;
  transform: perspective(800px) rotateY(-8deg);
  filter: drop-shadow(8px 12px 24px rgba(0,0,0,0.4));
}

.book__cover-design {
  border-radius: 4px;
  padding: 24px 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-height: 200px;
  justify-content: center;
  text-align: center;
}

.book__cover-design--1 {
  background: linear-gradient(160deg, #2c4a7c 0%, #1a2a4a 100%);
  border-left: 6px solid var(--color-red);
}

.book__cover-design--2 {
  background: linear-gradient(160deg, #c1121f 0%, #7d0000 100%);
  border-left: 6px solid rgba(255,255,255,0.4);
}

.book__cover-num {
  font-family: var(--font-en);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  opacity: 0.7;
  color: rgba(255,255,255,0.8);
}

.book__cover-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: white;
  text-align: center;
}

.book__cover-sub {
  font-size: 0.78rem;
  font-weight: 600;
  color: rgba(255,255,255,0.75);
}

.book__content {
  padding: 28px 28px 28px;
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: 12px;
}

.book__edition {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-red);
  text-transform: uppercase;
}

.book__title {
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 700;
  color: var(--color-navy);
  line-height: 1.4;
}

.book__text {
  font-size: 0.9rem;
  color: var(--color-gray-500);
  line-height: 1.7;
  flex: 1;
}

/* =========================================
   SPONSORS
   ========================================= */
.sponsors {
  background: linear-gradient(135deg, var(--color-navy-dark) 0%, var(--color-navy) 100%);
}

.sponsors__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.sponsor__item {
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
}

.sponsor__item:hover {
  transform: translateY(-3px);
}

.sponsor__logo-placeholder {
  background: rgba(255,255,255,0.05);
  border: 2px dashed rgba(255,255,255,0.15);
  border-radius: var(--radius-md);
  height: 100px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: rgba(255,255,255,0.35);
  transition: all var(--transition);
}

.sponsor__logo-placeholder:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.25);
  color: rgba(255,255,255,0.5);
}

.sponsor__logo-placeholder i { font-size: 1.8rem; }
.sponsor__logo-placeholder span { font-size: 0.78rem; }

.sponsors__contact {
  text-align: center;
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 40px;
}

.sponsors__contact p {
  color: rgba(255,255,255,0.65);
  font-size: 0.95rem;
  margin-bottom: 20px;
}

/* =========================================
   FOOTER
   ========================================= */
.footer {
  background: var(--color-navy-dark);
  padding: 64px 0 0;
}

.footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer__logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.footer__logo-icon {
  width: 38px; height: 38px;
  background: var(--color-red);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1rem;
}

.footer__logo-text {
  font-family: var(--font-en);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-white);
}

.footer__tagline {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.8;
  margin-bottom: 8px;
}

.footer__since {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.35);
  font-family: var(--font-en);
}

.footer__nav-title {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: rgba(255,255,255,0.45);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.footer__nav-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer__nav-list a {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}

.footer__nav-list a:hover { color: var(--color-white); }

.footer__no-seminar {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}

.footer__cta-text {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: 16px;
  line-height: 1.6;
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
}

.footer__copy {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.35);
}

.footer__url {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.25);
  font-family: var(--font-en);
}

/* =========================================
   BACK TO TOP
   ========================================= */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 48px; height: 48px;
  background: var(--color-navy);
  color: white;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  box-shadow: var(--shadow-md);
  transition: all var(--transition);
  opacity: 0;
  pointer-events: none;
  z-index: 900;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--color-red);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

/* =========================================
   RESPONSIVE — Tablet (≤ 960px)
   ========================================= */
@media (max-width: 960px) {
  .nav__menu {
    position: fixed;
    top: 72px; left: 0; right: 0;
    background: rgba(10, 20, 40, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    gap: 4px;
    transform: translateY(-110%);
    opacity: 0;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }
  .nav__item {
    height: 40%;
  }
  .nav__menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav__link {
    display: block;
    padding: 14px 16px;
    font-size: 1rem;
  }

  .nav__cta {
    margin: 8px 0 4px;
    text-align: center;
    padding: 14px 16px;
    border-radius: var(--radius-sm);
  }

  .nav__toggle { display: flex; }

  .seminar__inner {
    grid-template-columns: 1fr;
  }

  .seminar__visual {
    padding: 32px 24px;
    min-height: 180px;
  }

  .about__cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

/* =========================================
   RESPONSIVE — Mobile (≤ 640px)
   ========================================= */
@media (max-width: 640px) {
  .hero__actions {
    flex-direction: column;
    align-items: center;
  }

  .hero__actions .btn {
    width: 100%;
    max-width: 320px;
    justify-content: center;
  }

  .streaming__grid {
    grid-template-columns: 1fr;
  }

  .about__cards {
    grid-template-columns: 1fr;
  }

  .about__stats {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .books__grid {
    grid-template-columns: 1fr;
  }

  .sponsors__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer__inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer__bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .seminar__details {
    padding: 28px 20px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px; height: 42px;
  }
}

/* =========================================
   RESPONSIVE — Small Mobile (≤ 400px)
   ========================================= */
@media (max-width: 400px) {
  .sponsors__grid {
    grid-template-columns: 1fr;
  }
}
/* =========================================
   コンタクトフォーム
   ========================================= */

/* フォームを中央寄せカードに */
form {
  max-width: 500px;
  margin: 60px auto;
  padding: 32px;
  background: #ffffff;
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

/* ラベル */
form label {
  display: block;
  font-size: 14px;
  color: #333;
  margin-bottom: 6px;
}

/* 入力欄 */
form input,
form textarea {
  width: 100%;
  padding: 10px 12px;
  margin-bottom: 20px;
  border: 1px solid #D0D7E2;
  border-radius: 6px;
  font-size: 14px;
  transition: all 0.2s ease;
}

/* フォーカス時 */
form input:focus,
form textarea:focus {
  outline: none;
  border-color: #1F3A5F;
  box-shadow: 0 0 0 2px rgba(31, 58, 95, 0.1);
}

/* テキストエリア高さ */
form textarea {
  min-height: 120px;
  resize: vertical;
}

/* 送信ボタン */
form input[type="submit"] {
  background-color: #1F3A5F;
  color: #ffffff;
  border: none;
  padding: 12px;
  width: 100%;
  font-size: 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

/* ホバー */
form input[type="submit"]:hover {
  background-color: #2C4E7A;
  box-shadow: 0 4px 12px rgba(31, 58, 95, 0.3);
}