@charset "UTF-8";
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    background-color: #ffffff;
    color: #1f2937;
    line-height: 1.6;
    overflow-x: hidden;
    text-rendering: optimizeSpeed;
font-feature-settings: "palt";

}

.section-header_low span {
    background:linear-gradient(transparent 60%, #ff6 60%);
}

.section-header_s span {
    background:linear-gradient(transparent 60%, #ff6 60%);
    font-weight: 800;
}

.cta-content span {
    background:linear-gradient(transparent 60%, #ff6 60%);
    font-weight: 800;
}

.mechanism-text span {
    font-weight: 800;
    background:linear-gradient(transparent 60%, #ff6 60%);
}
/* Utility Classes */
.container {
    width: 100%;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1rem;
    padding-right: 1rem;
}


.cta-button-group a {
    color: #000;
}

.cta-button-group a:hover {
    color: #fd9504;
}

.cta a {
    color: #000;
}

.cta a:hover {
    color: #fd9504;
}



@media (min-width: 640px) {
    .container {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }
}

@media (min-width: 1024px) {
    .container {
        padding-left: 2rem;
        padding-right: 2rem;
        max-width: 1280px;
    }
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    transition: all 0.3s ease;
    background-color: transparent;
    padding: 1.5rem 0;
}

nav.scrolled {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid #e5e7eb;
    padding: 1rem 0;
    color: #000;
}

nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

nav.scrolled .logo {
    font-family: 'Roboto Mono', monospace;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.05em;
    color: #000000;
}


nav.scrolled .nav-links .btn-outline {
    border: 1px solid #000000;
    color: #000000;
    padding: 0.5rem 1rem;
    border-radius: 0;
    background-color: transparent;
    transition: all 0.2s;
}


nav.scrolled .nav-links .btn-outline:hover {
    background-color: #0f2c70;
    color: #ffffff;
    text-decoration: none;
}

nav.scrolled .nav-links {

    color: #000000;
}






nav.scrolled .logo {
    background: url(./book_i_b.png);
    background-repeat: no-repeat;
    background-size: 40px ;
    background-position: 0px 14px;
    padding: 0 0 0px 50px;
}

.logo {
    font-family: 'Roboto Mono', monospace;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.05em;
    color: #ffffff;
    max-width: 260px;
    margin: 5px 0 0 0;
    background: url(./book_i_w.png);
    background-repeat: no-repeat;
    background-size: 40px ;
    background-position: 0px 14px;
    padding: 0 0 0px 50px;
}

.logo .accent {
    color: #828282;
}

.nav-links {
    display: none;
    align-items: center;
    gap: 2rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: #fff;
}

.logo span {
    font-size: 12px;
    display: block;
}



.pc {
display: block;
}

.sp {
display: none;
}

@media (max-width: 768px) {
.sp {
display: block;
}

.pc {
display: none;
}


}

@media (min-width: 768px) {
    

    .nav-links {
        display: flex;
    }
}

.nav-links button {
    background: none;
    border: none;
    cursor: pointer;
    color: inherit;
    transition: color 0.2s;
}

.nav-links button:hover {
    text-decoration: underline;
}

.nav-links .btn-outline {
    border: 1px solid #ffffff;
    color: #ffffff;
    padding: 0.5rem 1rem;
    border-radius: 0;
    background-color: transparent;
    transition: all 0.2s;
}

.nav-links .btn-outline:hover {
    background-color: #fd9504;
    color: #ffffff;
    text-decoration: none;
}



/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 5rem;
    overflow: hidden;
    background-color: #001c54;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 0;
    opacity: 0.4;
    background-image: 
        linear-gradient(0deg, transparent 24%, rgba(203, 209, 221, 0.35) 25%, rgba(156, 163, 175, 0.05) 26%, transparent 27%, transparent 74%, rgba(156, 163, 175, 0.05) 75%, rgba(156, 163, 175, 0.05) 76%, transparent 77%, transparent),
        linear-gradient(90deg, transparent 24%, rgba(255, 255, 255, 0.05) 25%, rgba(247, 250, 255, 0.05) 26%, transparent 27%, transparent 74%, rgba(156, 163, 175, 0.05) 75%, rgba(156, 163, 175, 0.05) 76%, transparent 77%, transparent);
    background-size: 60px 60px;
}


/* ===== Hero Slider ===== */
.hero {
background-color: #000;
}

.hero-slider {
position: absolute;
inset: 0;
z-index: 0;
overflow: hidden;
}

.hero-slider .slide {
position: absolute;
inset: 0;
background-size: cover;
background-position: center;
opacity: 0;
transition: opacity 1.5s ease;
}

.hero-slider .slide::after {
content: '';
position: absolute;
inset: 0;
background: rgba(0, 28, 84, 0.89); /* 文字可読性 */
}

.hero-slider .slide.active {
opacity: 1;
}

/* ===== Lines ===== */
.hero-lines {
position: absolute;
inset: 0;
z-index: 1;
pointer-events: none;
}

.hero-line {
position: absolute;
width: 1px;
background-color: rgba(255, 255, 255, 0.25);
animation: floatLine linear infinite;
}

@keyframes floatLine {
from {
transform: translateY(110vh);
opacity: 0;
}
to {
transform: translateY(-10vh);
opacity: 1;
}
}

/* テキスト最前面 */
.hero-content {
z-index: 2;
}




.hero-content {
    position: relative;
    z-index: 10;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    animation: fadeInZoom 1s ease-out;
}

@keyframes fadeInZoom {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 0.75rem;
    border: 1px solid rgba(15, 23, 42, 0.3);
    background-color: rgba(255, 255, 255, 0.8);
    color: #0f172a;
    font-size: 0.75rem;
    font-family: 'Roboto Mono', monospace;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 2rem;
}

.badge-dot {
    width: 0.5rem;
    height: 0.5rem;
    background-color: #0f172a;
    border-radius: 50%;
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.hero h1 {
    font-size: clamp(2rem, 8vw, 4rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: 0.1em;
    margin-bottom: 1rem;
    max-width: 900px;
    color: #fff;
}

.hero h1 .light {
    opacity: 0.9;
    color: #00ffff;
}

.hero p {
    font-size: clamp(1.5rem, 3vw, 1.5rem);
    color: #ffffff;
    max-width: 600px;
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
}






@media (min-width: 640px) {
    .hero-buttons {
        flex-direction: row;
    }
}

.btn {
    padding: 1rem 2rem;
    font-size: 1.125rem;
    font-weight: 700;
    border: none;
    cursor: pointer;
    border-radius: 0;
    transition: all 0.2s;
    font-family: 'Noto Sans JP', sans-serif;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    justify-content: center;
}

.btn-primary {
    background-color: #ffffff;
    color: #1e293b;
    border: 2px solid #1e293b;
}

.btn-primary:hover {
    background-color: #1e293b;
    color: #fff;
}

.btn-outline {
    background-color: #fd9504;
    color: #ffffff;
    border: 1px solid #fd9504;
}

.btn-outline:hover {
    background-color:#ffffff;
    color: #fd9504;
    border: 1px solid #fd9504;
}

.scroll-indicator {
    position: absolute;
    bottom: 2.5rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    opacity: 0.5;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(-0.5rem);
    }
}

.scroll-indicator-text {
    font-size: 0.75rem;
    font-family: 'Roboto Mono', monospace;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: #1f2937;
}

.scroll-indicator-line {
    width: 1px;
    height: 3rem;
    background: linear-gradient(to bottom, #1f2937, transparent);
}

/* Problem Section */
.problem {
    padding: 6rem 0;
    background-color: rgba(15, 23, 42, 0.03);
    border-top: 1px solid #e5e7eb;
    border-bottom: 1px solid #e5e7eb;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
    max-width: 48rem;
    margin-left: auto;
    margin-right: auto;
}

.section-header_low {
    text-align: center;
    margin-bottom: 4rem;
    max-width: 48rem;
    margin-left: auto;
    margin-right: auto;
    padding: 60px 0 0 0;
    font-size: 22px;
    font-weight: 700;
}

.section-header_s {
    text-align: center;
    margin-bottom: 4rem;
    max-width: 48rem;
    margin-left: auto;
    margin-right: auto;
}


.section-header h2 {
    font-size: clamp(1.875rem, 5vw, 2.75rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.3;
    
}

.section-header_s h2 {
    font-size: clamp(1.875rem, 5vw, 2.75rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.3;
    
}

.section-header p {
    font-size: 1rem;
    color: #6b7280;
    line-height: 1.8;
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.problem-card {
    background-color: #ffffff;
    border: 1px solid #e5e7eb;
    padding: 1.5rem;
    display: flex;
    gap: 1rem;
    transition: all 0.3s;
}

.problem-card:hover {
    border-color: #0f172a;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.1);
}

.problem-card-icon {
width: 68px;
height: 68px;
flex-shrink: 0;
display: flex;
align-items: center;
justify-content: center;
}

.problem-card-icon img {
width: 100%;
height: 100%;
object-fit: contain;
opacity: 0.85;
}

/* 濃紺背景の場合の視認性 */
.section-dark .problem-card-icon img {
filter: brightness(1.1);
}

.problem-card:hover .problem-card-icon {
    background-color: #0f172a;
    color: #ffffff;
}

.problem-card-text {
    font-weight: 500;
    line-height: 1.6;
    padding-top: 0.25rem;
    font-size: 18px;
}

/* Mechanism Section */
.mechanism {
    padding: 6rem 0;
    position: relative;
    overflow: hidden;
    
}

.mechanism_low {
    padding: 1rem 0 6rem 0;
    position: relative;
    overflow: hidden;
    
}


/* ===============================
problem_n base
================================ */

.problem_n {
position: relative;
overflow: hidden;
background-color: #0f172a;
color: #ffffff;
padding: 100px 0;
}

/* ===============================
背景ラインレイヤー
================================ */

.bg-lines {
position: absolute;
inset: 0;
pointer-events: none;
z-index: 0;
}

/* 共通ライン設定 */
.line {
position: absolute;
background-color: rgba(255, 255, 255, 0.08);
opacity: 0.7;
}

/* 縦ライン */
.line.v {
width: 1px;
height: 140%;
top: -20%;
}

/* 横ライン */
.line.h {
height: 1px;
width: 140%;
left: -20%;
}

/* ===============================
縦ライン個別設定（左右ランダム）
================================ */

.v1 {
left: 20%;
animation: moveV1 3s ease-in-out infinite alternate;
}
.v2 {
left: 50%;
animation: moveV2 2s ease-in-out infinite alternate;
}
.v3 {
left: 75%;
animation: moveV3 2s ease-in-out infinite alternate;
}

@keyframes moveV1 {
0%   { transform: translateX(-40px); }
50%  { transform: translateX(30px); }
100% { transform: translateX(-10px); }
}
@keyframes moveV2 {
0%   { transform: translateX(20px); }
50%  { transform: translateX(-35px); }
100% { transform: translateX(10px); }
}
@keyframes moveV3 {
0%   { transform: translateX(-25px); }
50%  { transform: translateX(45px); }
100% { transform: translateX(-15px); }
}

/* ===============================
横ライン個別設定（上下ランダム）
================================ */

.h1 {
top: 25%;
animation: moveH1 4s ease-in-out infinite alternate;
}
.h2 {
top: 55%;
animation: moveH2 5s ease-in-out infinite alternate;
}
.h3 {
top: 80%;
animation: moveH3 7s ease-in-out infinite alternate;
}

@keyframes moveH1 {
0%   { transform: translateY(-30px); }
50%  { transform: translateY(40px); }
100% { transform: translateY(-15px); }
}
@keyframes moveH2 {
0%   { transform: translateY(20px); }
50%  { transform: translateY(-45px); }
100% { transform: translateY(10px); }
}
@keyframes moveH3 {
0%   { transform: translateY(-20px); }
50%  { transform: translateY(35px); }
100% { transform: translateY(-5px); }
}

/* ===============================
中身を前面に
================================ */

.problem_n .container {
position: relative;
z-index: 1;
}



.problem_n p {
    color: #fff !important;
    font-size: 18px;
    font-weight: 500;
}

.mechanism-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 4rem;
    align-items: center;
}

@media (min-width: 1024px) {
    .mechanism-grid {
        grid-template-columns: 1fr 1fr;
        gap: 4rem;
    }
}



.mechanism-text .label {
    color: #0f172a;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.mechanism-text h2 {
    font-size: clamp(1.875rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 2rem;
    line-height: 1.3;
}

.mechanism-text p {
    color: #3c3c3c;
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.mechanism-highlight {
    color: #1f2937;
    font-weight: 700;
    border-left: 10px solid #0f172a;
    padding-left: 1rem;
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
    background-color: rgba(15, 23, 42, 0.05);
    font-size: 20px;
    line-height: 28px !important;
}

.mechanism-diagram {
    background-color: #e7eaff;
    border: 1px solid #e5e7eb;
    padding: 2rem;
    position: relative;
}

.mechanism-diagram::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(to right, #0f172a, transparent);
}

.diagram-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.diagram-label {
    color: #0f172a;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.75rem;
}

.diagram-step {
    text-align: center;
    padding: 1rem;
    background-color: rgba(15, 23, 42, 0.05);
    border: 1px solid #e5e7eb;
    margin-bottom: 0rem;
    font-weight: 600;
}

.diagram-arrow {
    height: 2rem;
    width: 1px;
    background-color: rgba(15, 23, 42, 0.3);
    margin: 0 auto 0 auto;
}



.diagram-perspectives {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin-bottom: 2rem;
    font-size: 0.875rem;
}

.diagram-perspective {
    padding: 0.75rem;
    background-color: #ffffff;
    border: 1px solid #e5e7eb;
}

.perspective-label {
    font-size: 0.75rem;
    color: #6b7280;
    margin-bottom: 0.25rem;
}

.diagram-filter {
    position: relative;
    padding: 1rem;
    margin-bottom: 2rem;
}

.diagram-filter::before {
    content: '';
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.filter-line {
    width: 100%;
    height: 1px;
    background-color: rgba(15, 23, 42, 0.3);
    position: relative;
}

.filter-text {
    background-color: #ffffff;
    padding: 0 1rem;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    color: #0f172a;
    font-family: 'Roboto Mono', monospace;
    text-align: center;
    white-space: nowrap;
}

.diagram-judgments {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

.diagram-judgment {
    padding: 1rem;
    background-color: rgba(15, 23, 42, 0.2);
    border: 1px solid rgba(15, 23, 42, 0.5);
    color: #0f172a;
    font-weight: 700;
    text-align: center;
}

/* Books Section */
.books {
    padding: 6rem 0;
    background-color: rgba(15, 23, 42, 0.02);
    border-top: 1px solid #e5e7eb;
    border-bottom: 1px solid #e5e7eb;
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 3rem;
    margin-top: 3rem;
}

.book-card {
    background-color: #ffffff;
    border: 1px solid #e5e7eb;
    padding: 2rem;
    position: relative;
    transition: all 0.5s;
    overflow: hidden;
}

.book-card p {
    padding: 0 0 20px 0;
}

.book-card:hover {
    border-color: #0f172a;
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.1);
}

.book-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(to right, #0f172a, transparent);
}

.book-number {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 5rem;
    font-family: 'Roboto Mono', monospace;
    font-weight: 700;
    opacity: 0.1;
}

.book-card:hover .book-number {
    opacity: 0.2;
}

.book-badge {
    display: inline-block;
    padding: 0.5rem 0.75rem;
    background-color: #0f172a;
    color: #ffffff;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.book-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.book-subtitle {
    color: #0f172a;
    font-weight: 500;
    margin-bottom: 2rem;
}

.book-description {
    color: #6b7280;
    margin-bottom: 2rem;
    line-height: 1.8;
}

.book-description ul {
    list-style:circle;
}
.book-description ul li {
    margin: 0 0 0 25px;
}


.book-description_l {
    padding: 80px 0 0 0; 
    max-width: 680px; 
    margin: auto;
    text-align: center;
}



.book-card p span {
    background:linear-gradient(transparent 60%, #ff6 60%);
}



.book-list {
    list-style: none;
    margin-bottom: 2rem;
    padding-left: 1rem;
    border-left: 1px solid rgba(15, 23, 42, 0.3);
}

.book-list li {
    margin-bottom: 0.5rem;
    color: #6b7280;
    font-size: 0.95rem;
}

.book-list li::before {
    content: '・';
    margin-right: 0.5rem;
}

.book-highlight {
    background-color: rgba(15, 23, 42, 0.05);
    padding: 1.5rem;
    border: 1px solid #e5e7eb;
    margin-bottom: 1.5rem;
}

.book-highlight h4 {
    font-size: 0.875rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
}

.book-steps {
    width: 100%;
}

.book-step {
    text-align: center;
}

.book-step-number {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    background-color: rgba(15, 23, 42, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 0.5rem;
    color: #0f172a;
    font-weight: 700;
}

.book-changes {
    list-style: none;
    space-y: 0.75rem;
}

.book-changes li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
    color: #6b7280;
}

.book-changes li::before {
    content: '?';
    color: #0f172a;
    font-weight: 700;
    flex-shrink: 0;
}

/* CTA Section */
.cta {
    padding: 6rem 0;
    position: relative;
    background-color: #0f172a;
}

.cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background-color: rgba(15, 23, 42, 0.05);
    z-index: 0;
}

.cta-content {
    position: relative;
    z-index: 10;
    max-width: 56rem;
    margin: 0 auto;
    background-color: #ffffff;
    border: 1px solid #e5e7eb;
    padding: 2rem;
}

@media (min-width: 768px) {
    .cta-content {
        padding: 4rem;
    }
}

.cta-content h2 {
    font-size: clamp(1.875rem, 5vw, 2.25rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-align: center;
}

.cta-content p {
    font-size: 1.125rem;
    color: #0f172a;
    margin-bottom: 3rem;
    max-width: 52rem;
    margin-left: auto;
    margin-right: auto;
    text-align: left;
    line-height: 1.8;
}

.cta-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.cta-button-group {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    padding: 1.5rem;
    border: 1px solid #d7d7d7;
    background-color: rgba(218, 218, 218, 0.5);
    transition: all 0.3s;
}

.cta-button-group:hover {
    border-color: #0f172a;
    background-color: rgba(15, 23, 42, 0.02);
}

.cta-button-icon {
    width: 3rem;
    height: 3rem;
    background-color: rgba(15, 23, 42, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #0f172a;
    font-size: 1.5rem;
    margin: 0 auto;
}

.cta-button-group h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-align: center;
}

.cta-button-group p {
    font-size: 0.875rem;
    margin-bottom: 1rem;
    text-align: left;
}

.cta-button-group .btn {
    width: 100%;
}

/* AI-CATS Section */
.ai-cats {
    padding: 4rem 0;
    border-top: 1px solid #e5e7eb;
    background-color: rgba(15, 23, 42, 0.02);
}

.ai-cats-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    align-items: center;
}

@media (min-width: 768px) {
    .ai-cats-content {
        grid-template-columns: 1fr auto;
    }
}

.ai-cats-text h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.ai-cats-dot {
    width: 0.5rem;
    height: 0.5rem;
    background-color: #0f172a;
    border-radius: 50%;
}

.ai-cats-text p {
    font-size: 0.875rem;
    color: #6b7280;
    line-height: 1.8;
}

.ai-cats-logo {
    flex-shrink: 0;
    text-align: center;
}

.ai-cats-logo img {
    max-width: 150px;
}

.ai-cats-logo-label {
    font-size: 0.75rem;
    font-family: 'Roboto Mono', monospace;
    color: #6b7280;
    margin-bottom: 0.5rem;
    text-align: center;
}

.ai-cats-logo-text {
    font-size: 1rem;
    font-family: 'Roboto Mono', monospace;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: #0f172a;
    text-align: center;
}

.ai-cats-logo-text a {
    color: #0f172a;
    text-decoration: none;
}

.ai-cats-logo-text a:hover {
    color: #828282;
}
/* Footer */
footer {
    padding: 2rem 0;
    border-top: 1px solid #e5e7eb;
    background-color: #ffffff;
    text-align: center;
    font-size: 0.875rem;
    color: #6b7280;
}

/* Responsive */
@media (max-width: 640px) {
    .hero h1 {
        font-size: 1.875rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .section-header h2 {
        font-size: 1.7rem;
    }

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

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

    .book-description_l {
    padding: 80px 0 0 0; 
    max-width: 680px; 
    margin: auto;
    text-align: left;
}
}

/* ===== Scroll Prompt Animation ===== */
.scroll-indicator {
position: absolute;
bottom: 2.5rem;
left: 50%;
transform: translateX(-50%);
display: flex;
flex-direction: column;
align-items: center;
gap: 0.75rem;
opacity: 0.7;
z-index: 3;
}

/* テキスト：フェード点滅 */
.scroll-indicator-text {
font-size: 0.75rem;
font-family: 'Roboto Mono', monospace;
letter-spacing: 0.15em;
text-transform: uppercase;
color: #ffffff;
animation: scrollFade 2.5s ease-in-out infinite;
}

/* ライン：下方向に流れる */
.scroll-indicator-line {
position: relative;
width: 1px;
height: 3.5rem;
background: rgba(255, 255, 255, 0.25);
overflow: hidden;
}

.scroll-indicator-line::after {
content: '';
position: absolute;
top: -40%;
left: 0;
width: 1px;
height: 40%;
background: #00ffff;
animation: scrollLine 2s ease-in-out infinite;
}

/* Animations */
@keyframes scrollFade {
0% { opacity: 0.2; }
50% { opacity: 1; }
100% { opacity: 0.2; }
}

@keyframes scrollLine {
0% {
top: -40%;
opacity: 0;
}
30% {
opacity: 1;
}
100% {
top: 120%;
opacity: 0;
}
}


/* ===== Section Fade In ===== */
.fade-section {
opacity: 0;
transform: translateY(40px);
transition:
opacity 0.9s ease,
transform 0.9s ease;
will-change: opacity, transform;
}

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

/* 少しだけ抑制（思想系なので） */
@media (prefers-reduced-motion: reduce) {
.fade-section {
opacity: 1;
transform: none;
transition: none;
}
}

.yellow {
color: #fd9504;
}

.table_design08 {
border-collapse: collapse;
table-layout: fixed;
width: 100%;
max-width: 700px;
text-align: center;
}
.table_design08 th, .table_design08 td {
border: 2px solid #d2e8f1;
padding: 3px;
font-size: 14px;
}
.table_design08 thead th {
background-color: #0f172a;
color: #fff;
border: 2px solid #0f172a;
border-right: 2px solid #fff;
border-bottom: 2px solid #fff;
}
.table_design08 thead th:last-of-type {
border-right: 2px solid #0f172a;
}
.table_design08 tbody th {
color: #4d9bc1;
font-weight: bold;
text-align: center;
}
@media screen and (max-width: 2607px) {
.table_design08 {
text-align: left;
}
.table_design08 thead {
display:none;
}
.table_design08 th, .table_design08 td {
display: block;
border: 0;
border-bottom: 2px solid #e6f1f6;
}
.table_design08 tbody th{
background: #0f172a;
color:#fff;
}
.table_design08 td::before{
content: attr(data-label);
color: #0f172a;
font-weight: bold;
display: inline-block;
width: 20%;
min-width: 4em;
}
}

.table_design09 {
border-collapse: collapse;
table-layout: fixed;
width: 100%;
max-width: 700px;
text-align: center;
}
.table_design09 th, .table_design09 td {
border: 2px solid #d2e8f1;
padding: 3px;
font-size: 14px;
text-align: left !important;
}
.table_design09 thead th {
background-color: #4d9bc1;
color: #fff;
border: 2px solid #4d9bc1;
border-right: 2px solid #fff;
border-bottom: 2px solid #fff;
}
.table_design09 thead th:last-of-type {
border-right: 2px solid #4d9bc1;
}
.table_design09 tbody th {
color: #4d9bc1;
font-weight: bold;
text-align: center;
}
@media screen and (max-width: 787px) {
.table_design09 {
text-align: left;
}
.table_design09 thead {
display:none;
}
.table_design09 th {
display: block;
border: 0;
border-bottom: 2px solid #e6f1f6;
padding: 5px 0 5px 10px;
}


.table_design09 td {
display: block;
border: 0;
border-bottom: 2px solid #e6f1f6;

}


.table_design09 tbody th{
background: #4d9bc1;
color:#fff;
}
.table_design09 td::before{
content: attr(data-label);
color: #4d9bc1;
font-weight: bold;
display: inline-block;
width: 0%;
min-width: 4em;
}

.mechanism-diagram {
    background-color: #e7eaff;
    border: 1px solid #e5e7eb;
    padding: 10px 0rem;
    position: relative;
}

.book-highlight {
    background-color: rgba(15, 23, 42, 0.05);
    padding: 0rem;
    border: 1px solid #e5e7eb;
    margin-bottom: 1.5rem;
}


.cta-content {
    position: relative;
    z-index: 10;
    max-width: 56rem;
    margin: 0 auto;
    background-color: #ffffff;
    border: 1px solid #e5e7eb;
    padding: 0.4rem;
}

.cta-button-group {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    padding: 10px 0.3rem 10px 0.3rem;
    border: 1px solid #d7d7d7;
    background-color: rgba(218, 218, 218, 0.5);
    transition: all 0.3s;
}


}

.table_design10 {
border-collapse: collapse;
table-layout: fixed;
width: 100%;
max-width: 700px;
text-align: left;
}
.table_design10 th, .table_design10 td {
border: 2px solid #d2e8f1;
padding: 3px;
font-size: 14px;
}
.table_design10 thead th {
background-color: #0f172a;
color: #fff;
border: 2px solid #0f172a;
border-right: 2px solid #fff;
border-bottom: 2px solid #fff;
}
.table_design10 thead th:last-of-type {
border-right: 2px solid #0f172a;
}
.table_design10 tbody th {
color: #4d9bc1;
font-weight: bold;
text-align: left;
padding: 10px;
}

@media screen and (max-width: 2607px) {
.table_design10 {
text-align: left;
}
.table_design10 thead {
display:none;
}
.table_design10 th, .table_design10 td {
display: block;
border: 0;
border-bottom: 2px solid #e6f1f6;
}
.table_design10 tbody th{
background: #0f172a;
color:#fff;
}
.table_design10 td::before{
content: attr(data-label);
color: #0f172a;
display: inline-block;
width: 0%;

}
}


.cta-button-_b {
display: flex;
width: 90%;
margin: 40px auto 40px auto;
display: -webkit-flex;
display: flex;
gap: 10px;
text-align: left;
}

.cta-button-_b .cta-button-group {
-webkit-flex: 1;
flex: 1;
background: none;

}

.cta-button-_b .cta-button-group h3 {
text-align: left;
}


.cta-button-_b .cta-button-group h3 p {
min-height: 0px;
}


.cta-button-_b .cta-button-group p {
min-height: 0px;
}

@media screen and (max-width: 787px) {
.cta-button-_b {
display: block !important;
width: 90%;
margin: 40px auto 40px auto;
display: -webkit-flex;
display: flex;
gap: 10px;
}

.cta-button-_b .cta-button-group {
margin: 0 0 20px 0;

}

.cta-button-_b .cta-button-group p {
min-height: 10px;
}
.book-card {
    background-color: #ffffff;
    border: 1px solid #e5e7eb;
    padding: 10px 5px;
    position: relative;
    transition: all 0.5s;
    overflow: hidden;
}

.nav-links_s {
    display: block;
    align-items: center;
    gap: 2rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: #fff;
}
}

.ssc {
padding: 120px 0;
}

.ssc .inner {
max-width: 900px;
margin: auto;
}

.ssc .inner img {
max-width: 300px;
}

.ssc_info {
background: #001c54;
color: #fff;
padding: 5px 10px ;
display: inline;
margin: 20px 0 0 0;

}

.cta-content ol {
margin: 20px 0 0 19px;
}

.cta-content ol li {
margin: 5px 0 0 0;
font-size: 18px !important;
}