:root {
    /* Colors */
    --color-primary: #142833;
    /* Kachi-iro: Deep Navy */
    --color-accent: #C7B370;
    /* Kare-iro: Gold/Mustard */
    --color-text: #333333;
    --color-text-light: #F5F5F5;
    --color-bg-light: #F9F9F9;
    --color-bg-white: #FFFFFF;
    /* Course Colors */
    --color-basic: #2E8B57;
    /* Sea Green */
    --color-premium: #4682B4;
    /* Steel Blue */
    --color-special: #800080;
    /* Purple */
    /* Typography */
    --font-serif: 'Shippori Mincho', 'Times New Roman', serif;
    --font-heading: 'Zen Old Mincho', serif;
    --font-body: 'Helvetica Neue', Arial, sans-serif;
    /* Spacing */
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    /* Shadows */
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.05);
    --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.08);
}
/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: var(--font-body);
    color: var(--color-text);
    line-height: 1.8;
    background-color: var(--color-bg-light);
    overflow-x: hidden;
}
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    letter-spacing: 0.05em;
    line-height: 1.4;
}
a {
    text-decoration: none;
    color: inherit;
    transition: 0.3s;
}
ul {
    list-style: none;
}
img {
    max-width: 100%;
    height: auto;
}
/* Components */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}
.btn {
    display: inline-block;
    padding: 12px 32px;
    font-family: var(--font-serif);
    font-weight: 500;
    font-size: 1rem;
    text-align: center;
    border-radius: 4px;
    transition: all 0.3s ease;
    cursor: pointer;
}
.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-primary);
    border: 1px solid var(--color-accent);
}
.btn-primary:hover {
    background-color: transparent;
    color: var(--color-bg-white);
    border-color: var(--color-bg-white);
}
.btn-submit {
    background-color: var(--color-primary);
    color: var(--color-white);
    width: 100%;
    border: none;
    font-size: 1.1rem;
    padding: 15px;
    margin-top: 20px;
}
.btn-submit:hover {
    background-color: #0f1e26;
    transform: translateY(-2px);
}
/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    /* Glassmorphism */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: background 0.3s;
}
.header-inner {
    height: 70px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}
.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 0.05em;
}
.nav ul {
    display: flex;
    gap: 30px;
    align-items: center;
}
.nav a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-primary);
    position: relative;
    font-family: var(--font-serif);
}
.nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-accent);
    transition: width 0.3s;
}
.nav a:hover::after {
    width: 100%;
}
.lang-switch {
    font-family: var(--font-serif);
    font-weight: bold;
    color: var(--color-primary);
    margin-left: 10px;
}
.lang-switch a {
    color: #999;
}
.lang-switch a:hover {
    color: var(--color-primary);
}
.lang-switch .active {
    color: var(--color-primary);
    border-bottom: 2px solid var(--color-accent);
}
.btn-nav {
    padding: 8px 20px;
    background-color: var(--color-primary);
    color: #fff !important;
    /* Override */
    border-radius: 4px;
}
.btn-nav::after {
    display: none;
}
.btn-nav:hover {
    background-color: #2c4452;
}
.hamburger {
    display: none;
    cursor: pointer;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
}
.hamburger span {
    display: block;
    height: 2px;
    width: 100%;
    background-color: var(--color-primary);
    transition: 0.3s;
}
/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    filter: brightness(0.6);
    transform: scale(1.05);
    /* Avoid white edges on parallax */
    z-index: -1;
}
.hero-content {
    text-align: center;
    color: #fff;
    padding: var(--spacing-md);
    animation: fadeIn 1.5s ease-out;
}
.hero-subtitle {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    letter-spacing: 0.2em;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    color: var(--color-accent);
}
.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    margin-bottom: var(--spacing-md);
    font-weight: 400;
    line-height: 1.2;
}
.hero-desc {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    font-weight: 500;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}
/* Section Common */
.section {
    padding: var(--spacing-xl) 0;
}
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}
.section-title {
    font-size: 3rem;
    color: var(--color-primary);
    margin-bottom: 10px;
    font-family: var(--font-serif);
}
.section-jp-title {
    font-family: var(--font-heading);
    color: #666;
    letter-spacing: 0.1em;
    font-size: 1rem;
}
/* About / Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}
.feature-card {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--color-bg-white);
    border-radius: 8px;
    box-shadow: var(--shadow-soft);
    transition: transform 0.3s;
}
.feature-card:hover {
    transform: translateY(-5px);
}
.feature-icon {
    font-size: 2.5rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}
.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}
/* Courses */
.courses {
    background-color: #f2f2f2;
}
.course-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}
.course-card {
    flex: 1;
    min-width: 300px;
    max-width: 380px;
    background: var(--color-bg-white);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s;
    border-top: 5px solid #ccc;
}
.course-card:hover {
    transform: translateY(-10px);
}
.course-card.basic {
    border-color: var(--color-basic);
}
.course-card.premium {
    border-color: var(--color-premium);
}
.course-card.special {
    border-color: var(--color-special);
}
.course-badge {
    position: absolute;
    top: 15px;
    right: -30px;
    background: var(--color-accent);
    color: #fff;
    padding: 5px 40px;
    transform: rotate(45deg);
    font-size: 0.8rem;
    font-weight: bold;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}
.course-header {
    background-color: rgba(0, 0, 0, 0.02);
    padding: 20px;
    text-align: center;
}
.course-icon {
    font-size: 2rem;
    margin-bottom: 10px;
    display: block;
}
.basic .course-icon {
    color: var(--color-basic);
}
.premium .course-icon {
    color: var(--color-premium);
}
.special .course-icon {
    color: var(--color-special);
}
.course-header h3 {
    font-family: var(--font-serif);
    font-size: 1.6rem;
    margin-bottom: 5px;
}
.course-jp {
    font-size: 0.9rem;
    color: #888;
}
.course-price {
    text-align: center;
    padding: 15px;
    font-size: 1rem;
    color: #555;
    border-bottom: 1px dashed #ddd;
}
.course-price .price {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--color-primary);
    font-family: var(--font-heading);
}
.course-info {
    display: flex;
    justify-content: space-between;
    padding: 15px 20px;
    background-color: #fff;
    font-size: 0.9rem;
    color: #666;
    border-bottom: 1px dashed #ddd;
}
.course-concept {
    font-weight: bold;
    color: var(--color-primary);
}
.course-body {
    padding: 20px;
    flex-grow: 1;
}
.course-body p {
    font-size: 0.95rem;
    margin-bottom: 15px;
}
.recommend-list {
    margin-top: 15px;
    background-color: #f9f9f9;
    padding: 15px;
    border-radius: 6px;
}
.recommend-list li {
    font-size: 0.9rem;
    margin-bottom: 5px;
    position: relative;
    padding-left: 15px;
}
.recommend-list li::before {
    content: '✔';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}
.note {
    font-size: 0.8rem;
    color: #999;
    margin-top: 10px;
    text-align: right;
}
/* Quality */
.quality {
    position: relative;
    color: #fff;
    padding: 0;
    display: flex;
    align-items: center;
    min-height: 500px;
}
.quality-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    filter: brightness(0.4);
    z-index: 1;
}
.quality-container {
    position: relative;
    z-index: 2;
    display: flex;
    justify-content: flex-end;
}
.quality-content {
    background: rgba(20, 40, 51, 0.85);
    /* Transparent Primary */
    backdrop-filter: blur(5px);
    padding: 60px;
    max-width: 600px;
    border-left: 5px solid var(--color-accent);
}
.quality-title {
    font-size: 2.5rem;
    margin-bottom: 5px;
    font-family: var(--font-serif);
    color: var(--color-accent);
}
.quality-jp {
    font-size: 1rem;
    letter-spacing: 0.1rem;
    margin-bottom: 30px;
    opacity: 0.8;
}
.quality-text h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
}
.quality-text p {
    margin-bottom: 15px;
    font-size: 1.05rem;
}
/* FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}
.faq-item {
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 6px;
    background: #fff;
}
.faq-question {
    width: 100%;
    padding: 20px;
    text-align: left;
    background: none;
    border: none;
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--color-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}
.faq-question i {
    transition: transform 0.3s;
}
.faq-question.active i {
    transform: rotate(45deg);
}
.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}
.faq-answer p {
    padding-bottom: 20px;
    color: #666;
}
.cancel-policy li {
    padding-left: 15px;
    position: relative;
}
.cancel-policy li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: #999;
}
/* Contact */
.contact {
    background-color: var(--color-bg-white);
}
.contact-form {
    max-width: 700px;
    margin: 0 auto;
    background: #f9f9f9;
    padding: 40px;
    border-radius: 10px;
    box-shadow: var(--shadow-soft);
}
.form-group {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
}
.form-row {
    display: flex;
    gap: 20px;
}
.form-row .form-group {
    flex: 1;
}
label {
    font-weight: bold;
    margin-bottom: 8px;
    color: var(--color-primary);
    font-size: 0.95rem;
}
.required {
    color: #e74c3c;
    margin-left: 3px;
}
input,
select,
textarea {
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
    transition: border 0.3s;
}
input:focus,
select:focus,
textarea:focus {
    border-color: var(--color-primary);
    outline: none;
    box-shadow: 0 0 0 2px rgba(20, 40, 51, 0.1);
}
/* Footer */
.footer {
    background-color: var(--color-primary);
    color: #fff;
    padding: 30px 0;
    text-align: center;
}
.footer-logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin-bottom: 10px;
}
.footer p {
    font-size: 0.8rem;
    opacity: 0.6;
}
/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
/* Mobile Responsive */
@media (max-width: 768px) {
    .section-title {
        font-size: 2.2rem;
    }
    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: #fff;
        padding-top: 80px;
        transition: 0.3s;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    }
    .nav.active {
        right: 0;
    }
    .nav ul {
        flex-direction: column;
        gap: 20px;
    }
    .hamburger {
        display: flex;
        z-index: 1001;
    }
    .hero-title {
        font-size: 2.2rem;
    }
    .quality-content {
        padding: 30px;
        margin: 20px;
    }
    .form-row {
        flex-direction: column;
        gap: 0;
    }
}