/**
 * Whatever Partners Inc. - Main Stylesheet
 * SPファーストの1カラムレイアウト、最大幅1024px
 */

/* ==========================================================================
   CSS Variables
   ========================================================================== */
:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #3b82f6;
    --color-secondary: #0f172a;
    --color-accent: #06b6d4;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    /* Neutrals */
    --color-white: #ffffff;
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;
    --color-black: #000000;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    --gradient-dark: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-gray-800) 100%);
    
    /* Typography */
    --font-sans: 'Noto Sans JP', 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-en: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Letter spacing */
    --letter-spacing-heading: 0.08em;
    --letter-spacing-body: 0.03em;
    
    /* Font feature settings（字詰め） */
    --font-features-jp: "palt" 1, "pkna" 1;
    --font-features-kern: "kern" 1;
    
    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    
    /* Font Weights */
    --font-light: 300;
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    
    /* Line Heights */
    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;
    
    /* Layout */
    --container-max: 1024px;
    --container-padding: var(--space-6);
    --header-height: 80px;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* Z-index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
}

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

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

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    font-weight: var(--font-normal);
    line-height: var(--leading-relaxed);
    letter-spacing: var(--letter-spacing-body);
    font-feature-settings: var(--font-features-jp), var(--font-features-kern);
    color: var(--color-gray-800);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

body.menu-open {
    overflow: hidden;
}

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

a:hover {
    color: var(--color-primary);
}

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

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

ul, ol {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-bold);
    line-height: var(--leading-tight);
    color: var(--color-gray-900);
}

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: var(--z-fixed);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
}

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

.header-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Logo */
.site-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.site-logo:hover {
    color: inherit;
}

.logo-mark {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: auto;
    background: none;
    color: var(--color-white);
    font-family: var(--font-en);
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
    letter-spacing: -0.02em;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-main {
    font-family: var(--font-en);
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--color-gray-900);
    line-height: 1.2;
}

.logo-sub {
    font-family: var(--font-en);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--color-gray-500);
    letter-spacing: 0.1em;
}

/* Navigation: 780px以上で通常メニュー表示 */
.main-nav {
    display: none;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-2) 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-base), left var(--transition-base);
}

.nav-link:hover::after {
    width: 100%;
    left: 0;
}

.nav-label {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-gray-700);
    transition: color var(--transition-fast);
}

.nav-label-en {
    font-family: var(--font-en);
    font-size: var(--text-xs);
    font-weight: var(--font-normal);
    color: var(--color-gray-400);
    letter-spacing: 0.05em;
}

.nav-link:hover .nav-label,
.nav-link.active .nav-label {
    color: var(--color-primary);
}

/* Menu Toggle */
.menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    gap: 6px;
    padding: var(--space-2);
}

.menu-toggle-bar {
    width: 24px;
    height: 2px;
    background: var(--color-gray-800);
    border-radius: var(--radius-full);
    transition: transform var(--transition-base), opacity var(--transition-base);
}

.menu-toggle.active .menu-toggle-bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

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

.menu-toggle.active .menu-toggle-bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Navigation */
.mobile-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background: var(--color-white);
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

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

.mobile-nav-inner {
    padding: var(--space-8) var(--container-padding);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.mobile-nav-list {
    flex: 1;
}

.mobile-nav-item {
    border-bottom: 1px solid var(--color-gray-100);
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5) 0;
}

.mobile-nav-label {
    font-size: var(--text-lg);
    font-weight: var(--font-medium);
    color: var(--color-gray-800);
}

.mobile-nav-label-en {
    font-family: var(--font-en);
    font-size: var(--text-sm);
    color: var(--color-gray-400);
}

.mobile-nav-footer {
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-gray-200);
}

.mobile-nav-contact {
    text-align: center;
}

.mobile-nav-tel {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    color: var(--color-primary);
    margin-bottom: var(--space-2);
}

.mobile-nav-email {
    font-size: var(--text-sm);
    color: var(--color-gray-500);
}

/* ==========================================================================
   Main Content
   ========================================================================== */
.site-main {
    padding-top: var(--header-height);
    min-height: 100vh;
}

/* Breadcrumb */
.breadcrumb-wrap {
    background: var(--color-gray-50);
    border-bottom: 1px solid var(--color-gray-200);
    padding: var(--space-2) var(--container-padding);
}

.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-1);
    list-style: none;
    margin: 0;
    padding: 0;
    font-size: var(--text-sm);
    color: var(--color-gray-600);
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.breadcrumb-item a {
    color: var(--color-gray-600);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumb-item a:hover {
    color: var(--color-primary);
}

.breadcrumb-item:last-child {
    color: var(--color-gray-800);
    font-weight: var(--font-medium);
}

.breadcrumb-sep {
    color: var(--color-gray-400);
    pointer-events: none;
}

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

/* Section */
.section {
    padding: var(--space-16) 0;
}

.section-lg {
    padding: var(--space-24) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.section-title {
    font-size: var(--text-3xl);
    letter-spacing: var(--letter-spacing-heading);
    font-feature-settings: var(--font-features-jp), var(--font-features-kern);
    margin-bottom: var(--space-4);
}

.section-title-en {
    font-family: var(--font-en);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-primary);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: var(--space-2);
}

.section-desc {
    font-size: var(--text-base); /* PC 16px */
    color: var(--color-gray-600);
    max-width: 600px;
    margin: 0 auto;
    margin-bottom: var(--space-8);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    position: relative;
    min-height: calc(85vh - var(--header-height));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-8) var(--container-padding);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-dark);
    z-index: -2;
}

.hero-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(37, 99, 235, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(6, 182, 212, 0.1) 0%, transparent 50%);
    z-index: -1;
}

/* 雨エフェクト（scene=rainy のときのみ。Canvas で描画） */
.hero-rain-effect {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0;
}

.hero-scene-rainy .hero-rain-effect {
    opacity: 1;
}

.hero-rain-canvas {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: var(--container-max);
    text-align: center;
    color: var(--color-white);
}

.hero-label {
    display: none;
}

.hero-title {
    font-size: var(--text-4xl);
    font-weight: var(--font-bold);
    color: var(--color-white);
    margin-bottom: var(--space-6);
    line-height: var(--leading-tight);
    animation: fadeInUp 0.8s ease 0.2s forwards;
    opacity: 0;
}

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

.hero-desc {
    font-size: var(--text-lg);
    color: rgba(255, 255, 255, 0.8);
    max-width: 600px;
    margin: 0 auto var(--space-8);
    animation: fadeInUp 0.8s ease 0.4s forwards;
    opacity: 0;
}

.hero-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    animation: fadeInUp 0.8s ease 0.6s forwards;
    opacity: 0;
}

/* Hero 背景: プレースホルダー画像（動画準備前） */
.hero-bg-placeholder {
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.hero-video-wrap {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
}

.hero-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(var(--hero-brightness, 1)) saturate(0);
    transition: filter 0.6s ease;
}

.hero-video.active {
    filter: brightness(var(--hero-brightness, 1)) saturate(0);
}

.hero-video.hero-video-color {
    filter: brightness(var(--hero-brightness, 1)) saturate(1);
}

.hero.hero-video-ready .hero-bg-placeholder {
    visibility: hidden;
    pointer-events: none;
}

/* Hero: 1周目再生用プログレスバー（2周目でフェードアウト） */
.hero-progress {
    position: absolute;
    bottom: var(--space-4);
    left: var(--container-padding);
    right: var(--container-padding);
    height: 4px;
    background: rgba(255, 255, 255, 0.2);
    z-index: 2;
    pointer-events: none;
    opacity: 1;
    transition: opacity 0.5s ease;
    border-radius: 2px;
}

.hero-progress.hero-progress-done {
    opacity: 0;
}

.hero-progress-bar {
    height: 100%;
    width: calc(var(--hero-progress, 0) * 1%);
    max-width: 100%;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 2px;
    transition: width 0.15s ease-out;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    text-decoration: none;
}

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

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

.btn-outline {
    background: transparent;
    color: var(--color-white);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

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

.btn-secondary {
    background: var(--color-gray-100);
    color: var(--color-gray-800);
}

.btn-secondary:hover {
    background: var(--color-gray-200);
    color: var(--color-gray-900);
}

.btn-lg {
    padding: var(--space-5) var(--space-10);
    font-size: var(--text-lg);
}

.btn-icon {
    width: 20px;
    height: 20px;
}

/* ==========================================================================
   Cards
   ========================================================================== */
.card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.card-image {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
}

.card-body {
    padding: var(--space-6);
}

.card-title {
    font-size: var(--text-xl);
    margin-bottom: var(--space-3);
}

.card-desc {
    font-size: var(--text-base);
    color: var(--color-gray-600);
    line-height: var(--leading-relaxed);
}

/* Service Card */
.service-card {
    padding: var(--space-8);
    background: var(--color-white);
    border: 1px solid var(--color-gray-100);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-base);
}

.service-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.service-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-6);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    color: var(--color-white);
}

.service-icon svg {
    width: 32px;
    height: 32px;
}

.top-business-icon {
    display: block;
    width: 48px;
    height: 48px;
    margin: 0 auto var(--space-4);
}

.top-business-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.service-title {
    font-size: var(--text-xl);
    margin-bottom: var(--space-4);
}

.service-desc {
    font-size: var(--text-base);
    color: var(--color-gray-600);
    line-height: var(--leading-relaxed);
}

/* News Card */
.news-card {
    display: flex;
    flex-direction: column;
    padding: var(--space-5);
    background: var(--color-white);
    border: 1px solid var(--color-gray-100);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.news-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.news-meta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
}

.news-date {
    font-size: var(--text-sm);
    color: var(--color-gray-500);
}

.news-title {
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    line-height: var(--leading-snug);
}

/* Badge */
.badge {
    display: inline-block;
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    border-radius: var(--radius-full);
}

.badge-info {
    background: rgba(37, 99, 235, 0.1);
    color: var(--color-primary);
}

.badge-primary {
    background: rgba(6, 182, 212, 0.1);
    color: var(--color-accent);
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--color-warning);
}

/* ==========================================================================
   Grid System
   ========================================================================== */
.grid {
    display: grid;
    gap: var(--space-6);
}

.grid-2 {
    grid-template-columns: 1fr;
}

.grid-3 {
    grid-template-columns: 1fr;
}

.grid-4 {
    grid-template-columns: 1fr;
}

.case-card {
    padding: var(--space-8);
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.case-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.case-card-title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-3);
}

.case-card-desc {
    font-size: var(--text-sm);
    color: var(--color-gray-600);
    line-height: var(--leading-relaxed);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
    background: var(--color-gray-900);
    color: var(--color-white);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.footer-top {
    display: grid;
    gap: var(--space-10);
    margin-bottom: var(--space-10);
    padding-bottom: var(--space-10);
    border-bottom: 1px solid var(--color-gray-700);
}

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

.footer-logo {
    display: inline-block;
    margin-bottom: var(--space-4);
}

.footer-logo-img {
    height: 16px;
    width: auto;
    display: block;
    filter: brightness(0) invert(1);
}

.footer-tagline {
    font-size: var(--text-sm);
    color: var(--color-gray-400);
    max-width: 300px;
    margin: 0 auto;
}

.footer-nav-group {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-8);
}

.footer-nav-title {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--color-white);
    margin-bottom: var(--space-4);
}

.footer-nav-list li {
    margin-bottom: var(--space-2);
}

.footer-nav-list a {
    font-size: var(--text-sm);
    color: var(--color-gray-400);
    transition: color var(--transition-fast);
}

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

.footer-middle {
    display: grid;
    gap: var(--space-8);
    margin-bottom: var(--space-10);
    padding-bottom: var(--space-10);
    border-bottom: 1px solid var(--color-gray-700);
}

.footer-contact-title,
.footer-social-title {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--color-white);
    margin-bottom: var(--space-4);
}

.footer-address,
.footer-tel,
.footer-email {
    font-size: var(--text-sm);
    color: var(--color-gray-400);
    margin-bottom: var(--space-2);
}

.footer-email a {
    color: var(--color-gray-400);
}

.footer-email a:hover {
    color: var(--color-primary-light);
}

.social-links {
    display: flex;
    gap: var(--space-4);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-gray-800);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.social-link:hover {
    background: var(--color-primary);
}

.social-icon {
    width: 20px;
    height: 20px;
    fill: var(--color-white);
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
    text-align: center;
}

.copyright {
    font-size: var(--text-sm);
    color: var(--color-gray-500);
}

.footer-links {
    display: flex;
    gap: var(--space-6);
}

.footer-links a {
    font-size: var(--text-sm);
    color: var(--color-gray-400);
}

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

/* ==========================================================================
   Back to Top
   ========================================================================== */
.back-to-top {
    position: fixed;
    bottom: var(--space-8);
    right: var(--space-6);
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: var(--z-fixed);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-4px);
}

.back-to-top-icon {
    width: 24px;
    height: 24px;
    fill: currentColor;
}

/* ==========================================================================
   AI Chat Widget
   ========================================================================== */
.ai-chat-widget {
    position: fixed;
    bottom: var(--space-8);
    left: var(--space-6);
    z-index: var(--z-fixed);
}

.ai-chat-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    background: var(--gradient-primary);
    color: var(--color-white);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
}

.ai-chat-toggle:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-xl);
}

.ai-chat-icon {
    width: 24px;
    height: 24px;
    fill: currentColor;
}

.ai-chat-label {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
}

.ai-chat-panel {
    position: absolute;
    bottom: calc(100% + var(--space-4));
    left: 0;
    width: 320px;
    max-height: 450px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-2xl);
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-base);
}

.ai-chat-panel.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.ai-chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4);
    background: var(--gradient-primary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    color: var(--color-white);
}

.ai-chat-title {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
}

.ai-chat-close {
    width: 28px;
    height: 28px;
    font-size: var(--text-xl);
    color: var(--color-white);
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

.ai-chat-close:hover {
    opacity: 1;
}

.ai-chat-messages {
    flex: 1;
    padding: var(--space-4);
    overflow-y: auto;
    max-height: 300px;
}

.ai-message {
    padding: var(--space-3);
    background: var(--color-gray-100);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-3);
}

.ai-message p {
    font-size: var(--text-sm);
    color: var(--color-gray-700);
    line-height: var(--leading-relaxed);
}

.user-message {
    background: var(--color-primary);
    color: var(--color-white);
    margin-left: var(--space-8);
}

.user-message p {
    color: var(--color-white);
}

.ai-chat-input-area {
    display: flex;
    gap: var(--space-2);
    padding: var(--space-4);
    border-top: 1px solid var(--color-gray-100);
}

.ai-chat-input {
    flex: 1;
    padding: var(--space-3);
    font-size: var(--text-sm);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    outline: none;
    transition: border-color var(--transition-fast);
}

.ai-chat-input:focus {
    border-color: var(--color-primary);
}

.ai-chat-send {
    width: 40px;
    height: 40px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast);
}

.ai-chat-send:hover {
    background: var(--color-primary-dark);
}

.ai-chat-send svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

/* ==========================================================================
   Forms
   ========================================================================== */
.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-gray-700);
    margin-bottom: var(--space-2);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--space-4);
    font-size: var(--text-base);
    font-family: inherit;
    color: var(--color-gray-800);
    background: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

.form-required {
    color: var(--color-error);
    margin-left: var(--space-1);
}

/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* Animation Classes */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

.animate-delay-1 { transition-delay: 0.1s; }
.animate-delay-2 { transition-delay: 0.2s; }
.animate-delay-3 { transition-delay: 0.3s; }
.animate-delay-4 { transition-delay: 0.4s; }
.animate-delay-5 { transition-delay: 0.5s; }

/* ==========================================================================
   Utilities
   ========================================================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--color-primary); }
.text-gray { color: var(--color-gray-600); }
.text-white { color: var(--color-white); }

.bg-primary { background-color: var(--color-primary); }
.bg-gray { background-color: var(--color-gray-100); }
.bg-dark { background-color: var(--color-gray-900); }

.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }

.py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }
.py-12 { padding-top: var(--space-12); padding-bottom: var(--space-12); }
.py-16 { padding-top: var(--space-16); padding-bottom: var(--space-16); }

/* ==========================================================================
   Page Specific - Page Header
   ========================================================================== */
.page-header {
    padding: var(--space-16) 0;
    background: var(--gradient-dark);
    text-align: center;
}

.page-title {
    font-size: var(--text-3xl);
    letter-spacing: var(--letter-spacing-heading);
    font-feature-settings: var(--font-features-jp), var(--font-features-kern);
    color: var(--color-white);
    margin-bottom: var(--space-3);
}

.page-title-en {
    font-family: var(--font-en);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: rgba(255, 255, 255, 0.6);
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

/* Tablet and up (640px+) */
@media (min-width: 640px) {
    :root {
        --container-padding: var(--space-8);
    }
    
    .hero-title {
        font-size: 38px;
    }
    
    .hero-buttons {
        flex-direction: row;
        justify-content: center;
    }
    
    .grid-2 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .section-title {
        font-size: var(--text-4xl);
    }
}

/* SP (779px以下): ベース14px・小さい文字12px・見出し14px以上 */
@media (max-width: 779px) {
    html {
        font-size: 14px;
    }
    /* 最小フォント12px（--text-xs を 12px に */
    :root {
        --text-xs: 0.857rem; /* 12px @ 14px root */
    }
    .logo-mark {
        width: 52px;
        height: auto;
    }
    .hero-title {
        font-size: 28px; /* 見出し 14px以上 */
    }
    .btn-lg {
        padding: var(--space-3) var(--space-5);
        font-size: var(--text-base);
    }
    /* SPで見出しが14px未満にならないよう最小値を確保（remは14px基準で計算される） */
    .section-title {
        font-size: max(14px, var(--text-2xl));
    }
    .page-title {
        font-size: max(14px, var(--text-2xl));
    }
    /* section-lg の上余白を狭く */
    .section.section-lg {
        padding-top: var(--space-12);
    }
}

/* 780px以上: 通常メニュー表示 */
@media (min-width: 780px) {
    .main-nav {
        display: flex;
    }
    .menu-toggle {
        display: none;
    }
    .mobile-nav {
        display: none;
    }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
    .hero-title {
        font-size: 50px;
    }
    
    .grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .grid-4 {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .footer-top {
        grid-template-columns: 1fr 2fr;
        text-align: left;
    }
    
    .footer-brand {
        text-align: left;
    }
    
    .footer-tagline {
        margin: 0;
    }
    
    .footer-nav-group {
        grid-template-columns: repeat(2, 1fr);
        justify-items: end;
    }
    
    .footer-middle {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}