/* ====================================
   AMBL風 ミニマリストデザインシステム
   ALC AI研修サイト用
   ==================================== */

/* ===== CSS Variables ===== */
:root {
    /* Colors */
    --color-white: #FFFFFF;
    --color-black: #000000;
    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    --color-gray-900: #111827;
    
    /* Accent Gradient */
    --gradient-pink-purple: linear-gradient(135deg, #FF006B 0%, #8B5CF6 100%);
    --gradient-purple-blue: linear-gradient(135deg, #8B5CF6 0%, #3B82F6 100%);
    --gradient-accent: linear-gradient(135deg, #FF006B 0%, #8B5CF6 50%, #3B82F6 100%);
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;
    --space-4xl: 8rem;
    
    /* Typography */
    --font-sans: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;
    --font-weight-black: 900;
    
    /* Borders */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;
    --border-radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-index */
    --z-header: 1000;
    --z-floating-cta: 999;
    --z-modal: 2000;
}

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

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

body {
    font-family: var(--font-sans);
    font-weight: var(--font-weight-regular);
    line-height: 1.8;
    color: var(--color-black);
    background-color: var(--color-white);
    overflow-x: hidden;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: 1.3;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: var(--font-weight-black);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

p {
    font-size: clamp(1rem, 1.5vw, 1.125rem);
    line-height: 1.8;
    color: var(--color-gray-700);
}

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

/* ===== Layout Utilities ===== */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container-narrow {
    max-width: 1000px;
}

.section {
    padding: var(--space-4xl) 0;
}

.section-sm {
    padding: var(--space-3xl) 0;
}

/* ===== New Header Styles ===== */
.ambl-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 80px;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-gray-200);
    z-index: var(--z-header);
    transition: var(--transition-base);
}

.ambl-header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    padding: 0 var(--space-lg);
}

.ambl-logo {
    font-size: 1.5rem;
    font-weight: var(--font-weight-black);
    letter-spacing: 0.05em;
    color: var(--color-black);
}

.ambl-menu-btn {
    padding: var(--space-sm) var(--space-md);
    background: transparent;
    border: 2px solid var(--color-black);
    border-radius: var(--border-radius-full);
    font-size: 0.875rem;
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: var(--transition-base);
}

.ambl-menu-btn:hover {
    background-color: var(--color-black);
    color: var(--color-white);
}

/* Full-screen Menu Overlay */
.ambl-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--color-white);
    z-index: calc(var(--z-header) + 10);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.ambl-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

.ambl-menu-close {
    position: absolute;
    top: var(--space-lg);
    right: var(--space-lg);
    background: transparent;
    border: 2px solid var(--color-black);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition-base);
}

.ambl-menu-close:hover {
    background-color: var(--color-black);
    color: var(--color-white);
    transform: rotate(90deg);
}

.ambl-menu-nav {
    list-style: none;
    text-align: center;
}

.ambl-menu-nav li {
    margin: var(--space-lg) 0;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.ambl-menu-overlay.active .ambl-menu-nav li {
    opacity: 1;
    transform: translateY(0);
}

.ambl-menu-overlay.active .ambl-menu-nav li:nth-child(1) { transition-delay: 0.1s; }
.ambl-menu-overlay.active .ambl-menu-nav li:nth-child(2) { transition-delay: 0.2s; }
.ambl-menu-overlay.active .ambl-menu-nav li:nth-child(3) { transition-delay: 0.3s; }
.ambl-menu-overlay.active .ambl-menu-nav li:nth-child(4) { transition-delay: 0.4s; }
.ambl-menu-overlay.active .ambl-menu-nav li:nth-child(5) { transition-delay: 0.5s; }
.ambl-menu-overlay.active .ambl-menu-nav li:nth-child(6) { transition-delay: 0.6s; }

.ambl-menu-nav a {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: var(--font-weight-bold);
    color: var(--color-black);
    display: inline-block;
    position: relative;
}

.ambl-menu-nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 3px;
    background: var(--gradient-accent);
    transition: width var(--transition-base);
}

.ambl-menu-nav a:hover::after {
    width: 100%;
}

/* ===== New Hero Section ===== */
.ambl-hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-white);
    overflow: hidden;
    padding-top: 80px;
}

.ambl-hero-content {
    text-align: center;
    z-index: 10;
    position: relative;
}

.ambl-hero-title-en {
    font-size: clamp(4rem, 10vw, 8rem);
    font-weight: var(--font-weight-black);
    letter-spacing: -0.03em;
    line-height: 1;
    margin-bottom: var(--space-md);
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.ambl-hero-title-ja {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: var(--font-weight-bold);
    color: var(--color-gray-700);
    margin-bottom: var(--space-xl);
}

.ambl-hero-description {
    font-size: clamp(1rem, 1.5vw, 1.25rem);
    color: var(--color-gray-600);
    max-width: 600px;
    margin: 0 auto var(--space-2xl);
    line-height: 1.8;
}

/* Animated Gradient Line */
.ambl-gradient-line {
    position: absolute;
    width: 200%;
    height: 2px;
    background: var(--gradient-accent);
    top: 50%;
    left: -50%;
    opacity: 0.3;
    animation: flowLine 20s linear infinite;
}

@keyframes flowLine {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(50%);
    }
}

/* ===== Section Header (English + Japanese) ===== */
.ambl-section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.ambl-section-title-en {
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: var(--font-weight-black);
    letter-spacing: 0.05em;
    color: var(--color-black);
    margin-bottom: var(--space-sm);
}

.ambl-section-title-ja {
    font-size: clamp(1rem, 2vw, 1.5rem);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-500);
}

.ambl-section-subtitle {
    font-size: clamp(1rem, 1.5vw, 1.125rem);
    color: var(--color-gray-600);
    max-width: 700px;
    margin: var(--space-lg) auto 0;
}

/* ===== Cards ===== */
.ambl-card {
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--border-radius-lg);
    padding: var(--space-xl);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.ambl-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-gray-300);
}

.ambl-card-icon {
    width: 60px;
    height: 60px;
    margin-bottom: var(--space-lg);
}

.ambl-card-title {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-md);
    color: var(--color-black);
}

.ambl-card-text {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--color-gray-600);
}

/* ===== Grid Layouts ===== */
.ambl-grid {
    display: grid;
    gap: var(--space-xl);
}

.ambl-grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.ambl-grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.ambl-grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* ===== Buttons ===== */
.ambl-btn {
    display: inline-block;
    padding: var(--space-md) var(--space-2xl);
    font-size: 1rem;
    font-weight: var(--font-weight-bold);
    text-align: center;
    border-radius: var(--border-radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    letter-spacing: 0.05em;
}

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

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

.ambl-btn-outline {
    background: transparent;
    color: var(--color-black);
    border: 2px solid var(--color-black);
}

.ambl-btn-outline:hover {
    background-color: var(--color-black);
    color: var(--color-white);
}

/* ===== Floating CTA Button ===== */
.ambl-floating-cta {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    z-index: var(--z-floating-cta);
    padding: var(--space-md) var(--space-xl);
    background: var(--gradient-accent);
    color: var(--color-white);
    border-radius: var(--border-radius-full);
    font-size: 1rem;
    font-weight: var(--font-weight-bold);
    box-shadow: var(--shadow-xl);
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    letter-spacing: 0.05em;
}

.ambl-floating-cta:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 25px 40px rgba(0, 0, 0, 0.2);
}

/* ===== Stats Section ===== */
.ambl-stats {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: var(--space-xl);
    margin: var(--space-3xl) 0;
}

.ambl-stat-item {
    text-align: center;
    flex: 1;
    min-width: 200px;
}

.ambl-stat-number {
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: var(--font-weight-black);
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    margin-bottom: var(--space-sm);
}

.ambl-stat-label {
    font-size: 1rem;
    color: var(--color-gray-600);
    font-weight: var(--font-weight-medium);
}

/* ===== Footer ===== */
.ambl-footer {
    background-color: var(--color-gray-900);
    color: var(--color-white);
    padding: var(--space-3xl) 0 var(--space-lg);
}

.ambl-footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.ambl-footer-section h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-md);
    color: var(--color-white);
}

.ambl-footer-section ul {
    list-style: none;
}

.ambl-footer-section ul li {
    margin-bottom: var(--space-sm);
}

.ambl-footer-section a {
    color: var(--color-gray-400);
    transition: var(--transition-base);
}

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

.ambl-footer-bottom {
    text-align: center;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-gray-700);
    color: var(--color-gray-500);
    font-size: 0.875rem;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    :root {
        --space-3xl: 4rem;
        --space-4xl: 5rem;
    }
    
    .ambl-header-content {
        padding: 0 var(--space-md);
    }
    
    .ambl-hero {
        min-height: 80vh;
    }
    
    .ambl-grid-2,
    .ambl-grid-3,
    .ambl-grid-4 {
        grid-template-columns: 1fr;
    }
    
    .ambl-floating-cta {
        bottom: var(--space-md);
        right: var(--space-md);
        padding: var(--space-sm) var(--space-lg);
        font-size: 0.875rem;
    }
    
    .ambl-stats {
        flex-direction: column;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .ambl-grid-3,
    .ambl-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ===== Hero Fade-in Animation ===== */
@keyframes heroFadeIn {
    0% {
        opacity: 0;
        transform: translateY(30px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-fade-in {
    animation: heroFadeIn 1.2s ease-out forwards;
}

.hero-fade-in-delay-1 {
    opacity: 0;
    animation: heroFadeIn 1.2s ease-out 0.3s forwards;
}

.hero-fade-in-delay-2 {
    opacity: 0;
    animation: heroFadeIn 1.2s ease-out 0.6s forwards;
}

.hero-fade-in-delay-3 {
    opacity: 0;
    animation: heroFadeIn 1.2s ease-out 0.9s forwards;
}

/* ===== Scroll Down Indicator ===== */
.scroll-down-indicator {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-gray-500);
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    cursor: pointer;
    opacity: 0;
    animation: fadeInBounce 1.5s ease-out 1.5s forwards;
}

.scroll-down-indicator i {
    font-size: 1.5rem;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes fadeInBounce {
    0% {
        opacity: 0;
        transform: translateX(-50%) translateY(-20px);
    }
    100% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

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

/* ===== Horizontal Scroll Carousel ===== */
.horizontal-scroll-wrapper {
    overflow: hidden;
    position: relative;
    width: 100%;
    padding: var(--space-xl) 0;
}

.horizontal-scroll-track {
    display: flex;
    gap: var(--space-lg);
    animation: scrollLeft 40s linear infinite;
    width: fit-content;
}

.horizontal-scroll-track:hover {
    animation-play-state: paused;
}

@keyframes scrollLeft {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

.horizontal-scroll-item {
    flex: 0 0 350px;
    min-width: 350px;
}

@media (max-width: 768px) {
    .horizontal-scroll-item {
        flex: 0 0 280px;
        min-width: 280px;
    }
}

/* ===== Utility Classes ===== */
.text-center {
    text-align: center;
}

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

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }