/* ============================================================
   PREMIUM CONSULTING - LUXURY DESIGN SYSTEM
   ============================================================ */

/* CSS Custom Properties */
:root {
    /* Colors - Sophisticated Dark Palette */
    --color-primary: #0D0D0D;
    --color-secondary: #2D2D30;
    --color-accent: #B48A36;
    --color-accent-light: #e0c787;
    --color-accent-dark: #a68a4e;
    --color-text: #F0F0F0;
    --color-text-muted: #E2E2E3;
    --color-text-dark: #1a1a2e;
    --color-border: rgba(255, 255, 255, 0.1);
    --color-border-light: rgba(255, 255, 255, 0.05);
    --color-surface: #2D2D30;
    --color-surface-light: #22222e;

    /* Gradients */
    --gradient-gold: linear-gradient(135deg, #B48A36 0%, #e0c787 50%, #B48A36 100%);
    --gradient-dark: linear-gradient(180deg, #0D0D0D 0%, #2D2D30 100%);
    --gradient-radial: radial-gradient(ellipse at center, rgba(180, 138, 54, 0.15) 0%, transparent 70%);

    /* Typography */
    --font-display: 'Yu Mincho Demibold', '游明朝 Demibold', 'YuMincho', '游明朝', serif;
    --font-body: 'Yu Gothic Medium', '游ゴシック Medium', 'YuGothic', '游ゴシック体', sans-serif;
    --font-sans: 'Yu Gothic Medium', '游ゴシック Medium', 'YuGothic', '游ゴシック体', sans-serif;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 8rem;
    --space-2xl: 12rem;

    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.8s cubic-bezier(0.4, 0, 0.2, 1);

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 64px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 60px rgba(180, 138, 54, 0.2);
}

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

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

body {
    font-family: var(--font-body);
    background-color: var(--color-primary);
    color: var(--color-text);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.menu-open {
    overflow: hidden;
}

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

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

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

/* Container */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 clamp(1.5rem, 5vw, 6rem);
}

/* ============================================================
   LOADER
   ============================================================ */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

.loader.loaded {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader-content {
    text-align: center;
}

.loader-logo {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 300;
    letter-spacing: 1rem;
    color: var(--color-accent);
    margin-bottom: 2rem;
}

.loader-logo img {
    max-width: 200px;
    width: auto;
    height: auto;
    max-height: 60px;
    object-fit: contain;
    display: block;
    margin: 0 auto;
}

.loader-bar {
    width: 200px;
    height: 1px;
    background: var(--color-border);
    overflow: hidden;
}

.loader-bar span {
    display: block;
    width: 100%;
    height: 100%;
    background: var(--color-accent);
    animation: loaderBar 1.5s ease-in-out infinite;
}

@keyframes loaderBar {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* ============================================================
   HEADER (汎用クラス: .site-header も使用可能)
   ============================================================ */
.header,
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 1.5rem 0;
    transition: var(--transition-base);
}

.header.scrolled,
.site-header.scrolled {
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border);
}

.header.hidden,
.site-header.hidden {
    transform: translateY(-100%);
}

.header-inner,
.site-header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 clamp(1.5rem, 5vw, 6rem);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.logo,
.site-logo {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.logo-image,
.site-logo-image {
    display: inline-block;
    max-width: 180px;
    width: auto;
    height: auto;
    object-fit: contain;
    object-position: center;
}

.logo-image img,
.site-logo-image img {
    width: 100%;
    height: auto;
    max-height: 60px;
    object-fit: contain;
    display: block;
}

/* レスポンシブ: タブレットサイズ */
@media (max-width: 1024px) {
    .logo-image,
    .site-logo-image {
        max-width: 150px;
    }

    .logo-image img,
    .site-logo-image img {
        max-height: 50px;
    }
}

/* レスポンシブ: モバイルサイズ */
@media (max-width: 768px) {
    .logo-image,
    .site-logo-image {
        max-width: 120px;
    }

    .logo-image img,
    .site-logo-image img {
        max-height: 40px;
    }
}

.logo-sub,
.site-logo-sub {
    font-family: var(--font-sans);
    font-size: 0.6rem;
    font-weight: 400;
    letter-spacing: 0.35rem;
    color: var(--color-accent);
    text-transform: uppercase;
}

.nav,
.site-nav {
    display: flex;
    align-items: center;
    gap: 3rem;
    margin-left: auto;
}

.nav-link,
.site-nav-link {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: 0.1rem;
    text-transform: uppercase;
    color: var(--color-text-muted);
    transition: var(--transition-fast);
    position: relative;
}

.nav-link::after,
.site-nav-link::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-accent);
    transition: var(--transition-fast);
}

.nav-link:hover,
.site-nav-link:hover {
    color: var(--color-text);
}

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

.nav-link--cta,
.site-nav-link--cta {
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
    padding: 0.75rem 1.5rem;
    border-radius: 0;
}

.nav-link--cta::after,
.site-nav-link--cta::after {
    display: none;
}

.nav-link--cta:hover,
.site-nav-link--cta:hover {
    background: var(--color-accent);
    color: var(--color-primary);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 0.5rem;
    z-index: 1001;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 1px;
    background: var(--color-text);
    transition: var(--transition-fast);
}

.menu-toggle.active span:first-child {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:last-child {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8rem 0 4rem;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: var(--gradient-radial);
}

.hero-pattern {
    position: absolute;
    opacity: 0.03;
    background-image:
        linear-gradient(rgba(255,255,255,0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 100px 100px;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 1000px;
    padding: 0 2rem;
}

.hero-label {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.hero-label-line {
    width: 60px;
    height: 1px;
    background: var(--color-accent);
}

.hero-label-text {
    font-family: 'Yu Mincho Demibold', '游明朝 Demibold', 'YuMincho', '游明朝', serif;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.3rem;
    text-transform: uppercase;
    color: var(--color-accent);
}

.hero-title {
    margin-bottom: 2rem;
}

.hero-title-line {
    display: block;
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 7rem);
    font-weight: 300;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.hero-title-accent {
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-family: var(--font-body);
    font-size: clamp(1rem, 2vw, 1.25rem);
    font-weight: 300;
    color: var(--color-text-muted);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.1rem;
    text-transform: uppercase;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

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

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

.btn--ghost {
    border: 1px solid var(--color-border);
    color: var(--color-text);
}

.btn--ghost:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

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

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

.btn--large {
    padding: 1.25rem 3rem;
    font-size: 0.9rem;
}

/* ============================================================
   SECTION COMMON STYLES
   ============================================================ */
.section-label {
    font-family: var(--font-sans);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.3rem;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 1.5rem;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 300;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.section-subtitle {
    font-size: 1.1rem;
    font-weight: 300;
    color: var(--color-text-muted);
    max-width: 600px;
}

.text-gradient {
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ============================================================
   PHILOSOPHY SECTION
   ============================================================ */
.philosophy {
    padding: var(--space-xl) 0;
    background: var(--color-secondary);
    position: relative;
}


.philosophy-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
    opacity: 0;
    transform: translateY(40px);
    transition: var(--transition-slow);
}

.philosophy-content.in-view {
    opacity: 1;
    transform: translateY(0);
}

.philosophy-quote {
    font-family: var(--font-body);
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    font-weight: 300;
    line-height: 2;
    color: var(--color-text-muted);
}

/* ============================================================
   CHALLENGE SECTION
   ============================================================ */
.challenge {
    padding: var(--space-xl) 0;
}

.challenge-header {
    margin-bottom: var(--space-lg);
}

.challenge-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-lg);
    align-items: center;
    opacity: 0;
    transform: translateY(40px);
    transition: var(--transition-slow);
}

.challenge-content.in-view {
    opacity: 1;
    transform: translateY(0);
}

.challenge-text {
    font-size: 1.1rem;
    line-height: 2;
    color: var(--color-text-muted);
}

.challenge-image {
    position: relative;
    border-radius: 4px;
    overflow: hidden;
}

.challenge-image::before {
    content: '';
    position: absolute;
    inset: 0;
    border: 1px solid var(--color-accent);
    opacity: 0.3;
    z-index: 1;
    pointer-events: none;
}

.challenge-image img {
    width: 100%;
    transition: var(--transition-slow);
}

.challenge-image:hover img {
    transform: scale(1.05);
}

/* ============================================================
   SOLUTIONS SECTION
   ============================================================ */
.solutions {
    padding: var(--space-xl) 0;
    background: var(--color-secondary);
}

.solutions-header {
    text-align: center;
    margin-bottom: var(--space-lg);
}

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

.solution-card {
    opacity: 0;
    transform: translateY(40px);
    transition: var(--transition-slow);
}

.solution-card.in-view {
    opacity: 1;
    transform: translateY(0);
}

.solution-card:nth-child(2) { transition-delay: 0.1s; }
.solution-card:nth-child(3) { transition-delay: 0.2s; }

.solution-card-inner {
    position: relative;
    height: 500px;
    overflow: hidden;
    cursor: pointer;
}

.solution-number {
    position: absolute;
    top: 2rem;
    left: 2rem;
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 300;
    color: var(--color-accent);
    opacity: 0.5;
    z-index: 2;
    transition: var(--transition-base);
}

.solution-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 2rem;
    z-index: 2;
    transform: translateY(20px);
    transition: var(--transition-base);
}

.solution-title {
    font-family: var(--font-body);
    font-size: 1.5rem;
    font-weight: 500;
    line-height: 1.4;
    margin-bottom: 1rem;
}

.solution-desc {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    opacity: 0;
    transform: translateY(10px);
    transition: var(--transition-base);
}

.solution-image {
    position: absolute;
    inset: 0;
    opacity: 0.7;
}

.solution-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.solution-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(10, 10, 15, 0.95) 0%, rgba(10, 10, 15, 0.3) 50%, transparent 100%);
    z-index: 1;
}

.solution-card-inner:hover .solution-number {
    opacity: 1;
    transform: translateY(-10px);
}

.solution-card-inner:hover .solution-content {
    transform: translateY(0);
}

.solution-card-inner:hover .solution-desc {
    opacity: 1;
    transform: translateY(0);
}

.solution-card-inner:hover .solution-image img {
    transform: scale(1.1);
}

/* ============================================================
   SERVICES SECTION
   ============================================================ */
.services {
    padding: var(--space-xl) 0;
}

.services-header {
    margin-bottom: var(--space-lg);
}

.services-tabs {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.tabs-nav {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--color-border);
}

.tab-btn {
    padding: 1rem 1.5rem;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--color-text-muted);
    white-space: nowrap;
    transition: var(--transition-fast);
    position: relative;
}

.tab-btn::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-accent);
    transform: scaleX(0);
    transition: var(--transition-fast);
}

.tab-btn:hover {
    color: var(--color-text);
}

.tab-btn.active {
    color: var(--color-accent);
}

.tab-btn.active::after {
    transform: scaleX(1);
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.tab-panel-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    align-items: center;
}

.tab-panel-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: 1.5rem;
    color: var(--color-accent);
}

.tab-panel-desc {
    font-size: 1.1rem;
    line-height: 1.9;
    color: var(--color-text-muted);
    margin-bottom: 2rem;
}

.tab-panel-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.tab-panel-list li {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 1rem;
    color: var(--color-text);
}

.tab-panel-list li::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--color-accent);
    border-radius: 50%;
    flex-shrink: 0;
}

.tab-panel-image {
    position: relative;
    border-radius: 4px;
    overflow: hidden;
    aspect-ratio: 4/3;
    opacity: 0.7;
}

.tab-panel-image::before {
    content: '';
    position: absolute;
    inset: 0;
    border: 1px solid var(--color-accent);
    opacity: 0.2;
    z-index: 1;
}

.tab-panel-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ============================================================
   CASES SECTION
   ============================================================ */
.cases {
    padding: var(--space-xl) 0;
    background: var(--color-secondary);
}

.cases-header {
    margin-bottom: var(--space-lg);
}

.cases-slider {
    overflow: visible;
}

.cases-track {
    display: flex;
    gap: 2rem;
    overflow-x: auto;
    padding-bottom: 2rem;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
}

.cases-track::-webkit-scrollbar {
    height: 4px;
}

.cases-track::-webkit-scrollbar-track {
    background: var(--color-border);
}

.cases-track::-webkit-scrollbar-thumb {
    background: var(--color-accent);
}

.case-card {
    flex: 0 0 400px;
    scroll-snap-align: start;
    opacity: 0;
    transform: translateY(40px);
    transition: var(--transition-slow);
}

.case-card.in-view {
    opacity: 1;
    transform: translateY(0);
}

.case-card:nth-child(2) { transition-delay: 0.1s; }
.case-card:nth-child(3) { transition-delay: 0.2s; }

.case-card-image {
    position: relative;
    height: 250px;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.case-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.case-card-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(10, 10, 15, 0.8), transparent);
}

.case-card:hover .case-card-image img {
    transform: scale(1.1);
}

.case-card-content {
    padding: 0 0.5rem;
}

.case-card-industry {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.2rem;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 1rem;
}

.case-card-title {
    font-family: var(--font-body);
    font-size: 1.25rem;
    font-weight: 500;
    line-height: 1.5;
    margin-bottom: 1rem;
}

.case-card-desc {
    font-size: 0.9rem;
    line-height: 1.8;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

.case-card-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.1rem;
    text-transform: uppercase;
    color: var(--color-accent);
    transition: var(--transition-fast);
}

.case-card-link:hover {
    gap: 1rem;
}

/* ============================================================
   LEADERSHIP SECTION
   ============================================================ */
.leadership {
    padding: var(--space-xl) 0;
}

.leadership-header {
    text-align: center;
    margin-bottom: var(--space-lg);
}

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

.leader-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: 2.5rem;
    transition: var(--transition-base);
    opacity: 0;
    transform: translateY(40px);
}

.leader-card.in-view {
    opacity: 1;
    transform: translateY(0);
}

.leader-card:nth-child(2) { transition-delay: 0.1s; }
.leader-card:nth-child(3) { transition-delay: 0.2s; }
.leader-card:nth-child(4) { transition-delay: 0.3s; }
.leader-card:nth-child(5) { transition-delay: 0.4s; }
.leader-card:nth-child(6) { transition-delay: 0.5s; }

.leader-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-5px);
}

.leader-card-image {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    overflow: hidden;
    margin-bottom: 1.5rem;
    border: 2px solid var(--color-accent);
}

.leader-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    transform: translateZ(0);
}

.leader-name {
    font-family: var(--font-body);
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.leader-role {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1rem;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 1rem;
}

.leader-bio {
    font-size: 0.9rem;
    line-height: 1.8;
    color: var(--color-text-muted);
}

/* ============================================================
   CTA SECTION
   ============================================================ */
.cta {
    position: relative;
    padding: var(--space-2xl) 0;
    overflow: hidden;
}

.cta-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-radial);
}

.cta-content {
    position: relative;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 300;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.cta-text {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: 3rem;
}

/* ============================================================
   FOOTER (汎用クラス: .site-footer も使用可能)
   ============================================================ */
.footer,
.site-footer {
    background: var(--color-secondary);
    padding: var(--space-xl) 0 var(--space-md);
    border-top: 1px solid var(--color-border);
}

.footer-main,
.site-footer-main {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-lg);
}

.footer-brand,
.site-footer-brand {
    max-width: 350px;
}

.footer-logo,
.site-footer-logo {
    margin-bottom: 1.5rem;
}

.footer-logo-image,
.site-footer-logo-image {
    display: inline-block;
    width: 50%;
    height: 50%;
    object-fit: contain;
    object-position: center;
}

.footer-desc,
.site-footer-desc {
    font-size: 0.9rem;
    line-height: 1.8;
    color: var(--color-text-muted);
    margin-bottom: 2rem;
}

.footer-social,
.site-footer-social {
    display: flex;
    gap: 1rem;
}

.footer-social a,
.site-footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    transition: var(--transition-fast);
}

.footer-social a:hover,
.site-footer-social a:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.footer-nav,
.site-footer-nav {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
}

.footer-nav-title,
.site-footer-nav-title {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.15rem;
    text-transform: uppercase;
    color: var(--color-text);
    margin-bottom: 1.5rem;
}

.footer-nav-list,
.site-footer-nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-nav-list a,
.site-footer-nav-list a {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    transition: var(--transition-fast);
}

.footer-nav-list a:hover,
.site-footer-nav-list a:hover {
    color: var(--color-accent);
}

/* .footer-contact と .site-footer-contact は子要素でスタイルを適用 */

.footer-contact li,
.site-footer-contact li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-text-muted);
}

.footer-contact svg,
.site-footer-contact svg {
    color: var(--color-accent);
    flex-shrink: 0;
}

.footer-bottom,
.site-footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.footer-legal,
.site-footer-legal {
    display: flex;
    gap: 2rem;
}

.footer-legal a:hover,
.site-footer-legal a:hover {
    color: var(--color-accent);
}

/* ============================================================
   RESPONSIVE STYLES
   ============================================================ */
@media (max-width: 1024px) {
    /* 共通タイポグラフィ - タブレット */
    .section-label {
        font-size: 0.65rem;
        letter-spacing: 0.25rem;
    }

    .section-title {
        font-size: clamp(2rem, 4vw, 3rem);
        margin-bottom: 1rem;
    }

    .section-subtitle {
        font-size: 1rem;
    }

    /* Container - タブレット */
    .container {
        padding: 0 clamp(1rem, 4vw, 3rem);
    }

    /* Hero Section - タブレット */
    .hero {
        min-height: 80vh;
        padding: 6rem 0 3rem;
    }

    .hero-content {
        padding: 0 1.5rem;
    }

    /* Header - タブレット */
    .header-inner,
    .site-header-inner {
        padding: 0 clamp(1rem, 4vw, 3rem);
    }

    .nav,
    .site-nav {
        gap: 2rem;
    }

    .nav-link,
    .site-nav-link {
        font-size: 0.75rem;
    }

    /* Philosophy Section - タブレット */
    .philosophy {
        padding: var(--space-lg) 0;
    }

    /* Challenge Section - タブレット */
    .challenge {
        padding: var(--space-lg) 0;
    }

    .challenge-content {
        gap: var(--space-md);
    }

    /* Solutions Section - タブレット */
    .solutions {
        padding: var(--space-lg) 0;
    }

    .solutions-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .solution-card:nth-child(3) {
        grid-column: span 2;
    }

    .solution-card-inner {
        height: 400px;
    }

    /* Services Section - タブレット */
    .services {
        padding: var(--space-lg) 0;
    }

    .tab-panel-title {
        font-size: 2rem;
    }

    .tab-panel-desc {
        font-size: 1rem;
    }

    /* Cases Section - タブレット */
    .cases {
        padding: var(--space-lg) 0;
    }

    .case-card {
        flex: 0 0 350px;
    }

    /* Leadership Section - タブレット */
    .leadership {
        padding: var(--space-lg) 0;
    }

    .leaders-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .leader-card {
        padding: 2rem;
    }

    /* Footer - タブレット */
    .footer-main,
    .site-footer-main {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .footer-nav,
    .site-footer-nav {
        grid-template-columns: repeat(3, 1fr);
        gap: 2rem;
    }

    .footer-logo-image,
    .site-footer-logo-image {
        width: 40%;
    }

    /* CTA Section - タブレット */
    .cta {
        padding: var(--space-xl) 0;
    }

    .cta-title {
        font-size: clamp(2rem, 4vw, 3rem);
        margin-bottom: 1rem;
    }

    .cta-text {
        font-size: 1rem;
        margin-bottom: 2rem;
    }

    /* Loader - タブレット */
    .loader-logo img {
        max-width: 150px;
        max-height: 45px;
    }

    .loader-bar {
        width: 150px;
    }
}

@media (max-width: 768px) {
    /* 共通タイポグラフィ - モバイル */
    .section-label {
        font-size: 0.6rem;
        letter-spacing: 0.2rem;
    }

    .section-title {
        font-size: clamp(1.75rem, 5vw, 2.5rem);
        margin-bottom: 0.75rem;
    }

    .section-subtitle {
        font-size: 0.95rem;
    }

    /* Container - モバイル */
    .container {
        padding: 0 1rem;
    }

    /* Hero Section - モバイル */
    .hero {
        min-height: 70vh;
        padding: 5rem 0 2rem;
    }

    .hero-content {
        padding: 0 1rem;
    }

    .hero-label {
        margin-bottom: 1.5rem;
    }

    .hero-label-text {
        font-size: 0.7rem;
        letter-spacing: 0.2rem;
    }

    .hero-subtitle {
        margin-bottom: 2rem;
    }

    /* Header - モバイル */
    .header,
    .site-header {
        padding: 1rem 0;
    }

    .header-inner,
    .site-header-inner {
        padding: 0 1rem;
    }

    .nav,
    .site-nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-primary);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2rem;
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-base);
    }

    .nav.active,
    .site-nav.active {
        opacity: 1;
        visibility: visible;
    }

    .nav-link,
    .site-nav-link {
        font-size: 1.5rem;
        letter-spacing: 0.2rem;
    }

    .nav-link--cta,
    .site-nav-link--cta {
        font-size: 1rem;
    }

    .menu-toggle {
        display: flex;
    }

    /* Philosophy Section - モバイル */
    .philosophy {
        padding: var(--space-md) 0;
    }

    .philosophy-quote {
        font-size: 1rem;
        line-height: 1.8;
        padding: 0 1rem;
    }

    /* Challenge Section - モバイル */
    .challenge {
        padding: var(--space-md) 0;
    }

    .challenge-header {
        margin-bottom: var(--space-md);
    }

    .challenge-content {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .challenge-text {
        font-size: 1rem;
        line-height: 1.8;
    }

    /* Solutions Section - モバイル */
    .solutions {
        padding: var(--space-md) 0;
    }

    .solutions-header {
        margin-bottom: var(--space-md);
    }

    .solutions-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .solution-card:nth-child(3) {
        grid-column: span 1;
    }

    .solution-card-inner {
        height: 350px;
    }

    /* Services Section - モバイル */
    .services {
        padding: var(--space-md) 0;
    }

    .services-header {
        margin-bottom: var(--space-md);
    }

    .services-tabs {
        gap: 2rem;
    }

    .tabs-nav {
        gap: 0.25rem;
        padding-bottom: 0.75rem;
    }

    .tab-btn {
        padding: 0.75rem 1rem;
        font-size: 0.8rem;
    }

    .tab-panel-content {
        grid-template-columns: 1fr;
    }

    .tab-panel-image {
        order: -1;
    }

    .tab-panel-title {
        font-size: 1.75rem;
        margin-bottom: 1rem;
    }

    .tab-panel-desc {
        font-size: 0.95rem;
        line-height: 1.7;
        margin-bottom: 1.5rem;
    }

    .tab-panel-list {
        gap: 0.75rem;
    }

    .tab-panel-list li {
        font-size: 0.9rem;
    }

    /* Cases Section - モバイル */
    .cases {
        padding: var(--space-md) 0;
    }

    .cases-header {
        margin-bottom: var(--space-md);
    }

    .cases-track {
        gap: 1.5rem;
    }

    .case-card {
        flex: 0 0 320px;
    }

    .case-card-image {
        height: 200px;
    }

    .case-card-title {
        font-size: 1.1rem;
    }

    .case-card-desc {
        font-size: 0.85rem;
    }

    /* Leadership Section - モバイル */
    .leadership {
        padding: var(--space-md) 0;
    }

    .leadership-header {
        margin-bottom: var(--space-md);
    }

    .leaders-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .leader-card {
        padding: 2rem;
    }

    .leader-card-image {
        width: 80px;
        height: 80px;
    }

    .leader-name {
        font-size: 1.1rem;
    }

    .leader-bio {
        font-size: 0.85rem;
        line-height: 1.7;
    }

    /* Footer - モバイル */
    .footer {
        padding: var(--space-md) 0 var(--space-sm);
    }

    .footer-main,
    .site-footer-main {
        gap: var(--space-md);
        margin-bottom: var(--space-md);
    }

    .footer-nav,
    .site-footer-nav {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-bottom,
    .site-footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .footer-legal,
    .site-footer-legal {
        flex-direction: column;
        gap: 1rem;
    }

    /* CTA Section - モバイル */
    .cta {
        padding: var(--space-lg) 0;
    }

    .cta-title {
        font-size: clamp(1.75rem, 5vw, 2.5rem);
        margin-bottom: 0.75rem;
    }

    .cta-text {
        font-size: 0.95rem;
        margin-bottom: 2rem;
    }

    /* Buttons - モバイル */
    .btn {
        padding: 0.875rem 1.5rem;
        font-size: 0.8rem;
    }

    .hero-cta {
        flex-direction: column;
        gap: 1rem;
    }

    /* Loader - モバイル */
    .loader-logo img {
        max-width: 120px;
        max-height: 36px;
    }

    .loader-bar {
        width: 120px;
    }
    .tabs-nav{
        overflow-x: auto;                /* 横スクロールは維持 */
        -webkit-overflow-scrolling: touch;
        padding: 0 0 0.75rem 0;          /* 下余白だけ */
        scroll-snap-type: x mandatory;   /* スクロールを気持ちよく */
    }

    .tab-btn{
        scroll-snap-align: start;
        flex: 0 0 auto;
    }

    /* スクロールバーを目立たせない */
    .tabs-nav::-webkit-scrollbar { height: 0; }

}

@media (max-width: 480px) {
    /* 共通タイポグラフィ - 小型モバイル */
    .section-label {
        font-size: 0.55rem;
        letter-spacing: 0.15rem;
    }

    .section-title {
        font-size: clamp(1.5rem, 6vw, 2rem);
        margin-bottom: 0.5rem;
    }

    .section-subtitle {
        font-size: 0.85rem;
    }

    /* Container - 小型モバイル */
    .container {
        padding: 0 0.75rem;
    }

    /* Hero Section - 小型モバイル */
    .hero {
        min-height: 60vh;
        padding: 4rem 0 1.5rem;
    }

    .hero-content {
        padding: 0 0.75rem;
    }

    .hero-label {
        margin-bottom: 1rem;
        gap: 0.75rem;
    }

    .hero-label-line {
        width: 40px;
    }

    .hero-label-text {
        font-size: 0.65rem;
        letter-spacing: 0.15rem;
    }

    .hero-title-line {
        font-size: 2.5rem;
        line-height: 1.2;
    }

    .hero-subtitle {
        font-size: 0.9rem;
        margin-bottom: 1.5rem;
    }

    /* Header - 小型モバイル */
    .header-inner,
    .site-header-inner {
        padding: 0 0.75rem;
    }

    /* Philosophy Section - 小型モバイル */
    .philosophy {
        padding: var(--space-sm) 0;
    }

    .philosophy-quote {
        font-size: 0.95rem;
        line-height: 1.7;
    }

    /* Challenge Section - 小型モバイル */
    .challenge {
        padding: var(--space-sm) 0;
    }

    .challenge-text {
        font-size: 0.95rem;
    }

    /* Solutions Section - 小型モバイル */
    .solutions {
        padding: var(--space-sm) 0;
    }

    .solution-card-inner {
        height: 300px;
    }

    .solution-number {
        font-size: 3rem;
    }

    .solution-title {
        font-size: 1.1rem;
    }

    .solution-desc {
        font-size: 0.85rem;
    }

    /* Services Section - 小型モバイル */
    .services {
        padding: var(--space-sm) 0;
    }

    .tabs-nav {
        gap: 0;
        padding-bottom: 0.5rem;
    }

    .tab-btn {
        padding: 0.75rem 1rem;
        font-size: 0.75rem;
    }

    .tab-panel-title {
        font-size: 1.5rem;
    }

    .tab-panel-desc {
        font-size: 0.9rem;
    }

    .tab-panel-list li {
        font-size: 0.85rem;
    }

    /* Cases Section - 小型モバイル */
    .cases {
        padding: var(--space-sm) 0;
    }

    .case-card {
        flex: 0 0 280px;
    }

    .case-card-image {
        height: 180px;
    }

    .case-card-title {
        font-size: 1rem;
    }

    .case-card-desc {
        font-size: 0.8rem;
    }

    /* Leadership Section - 小型モバイル */
    .leadership {
        padding: var(--space-sm) 0;
    }

    .leader-card {
        padding: 1.5rem;
    }

    .leader-card-image {
        width: 70px;
        height: 70px;
        margin-bottom: 1rem;
    }

    .leader-name {
        font-size: 1rem;
    }

    .leader-role {
        font-size: 0.7rem;
    }

    .leader-bio {
        font-size: 0.8rem;
        line-height: 1.6;
    }

    /* Footer - 小型モバイル */
    .footer {
        padding: var(--space-sm) 0;
    }

    .footer-logo-image,
    .site-footer-logo-image {
        width: 60%;
    }

    .footer-nav-list,
    .site-footer-nav-list {
        gap: 0.5rem;
    }

    .footer-nav-list a,
    .site-footer-nav-list a {
        font-size: 0.85rem;
    }

    .footer-bottom,
    .site-footer-bottom {
        font-size: 0.75rem;
    }

    /* CTA Section - 小型モバイル */
    .cta {
        padding: var(--space-md) 0;
    }

    .cta-title {
        font-size: clamp(1.5rem, 6vw, 2rem);
        margin-bottom: 0.5rem;
    }

    .cta-text {
        font-size: 0.85rem;
        margin-bottom: 1.5rem;
    }

    /* Buttons - 小型モバイル */
    .btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.75rem;
        width: 100%;
        justify-content: center;
    }

    .hero-cta {
        gap: 0.75rem;
    }

    /* Loader - 小型モバイル */
    .loader-logo img {
        max-width: 100px;
        max-height: 30px;
    }

    .loader-bar {
        width: 100px;
    }

    /* タッチデバイス用の調整 */
    @media (hover: none) and (pointer: coarse) {
        /* モバイルデバイスではホバー効果を無効化 */
        .solution-card-inner:hover .solution-image img,
        .challenge-image:hover img,
        .case-card:hover .case-card-image img {
            transform: none;
        }

        /* タッチターゲットの最小サイズ確保 */
        .nav-link,
        .site-nav-link,
        .tab-btn,
        .btn {
            min-height: 44px;
            min-width: 44px;
        }
    }
}