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

:root {
    /* Color Palette */
    --primary-color: #6B5D4F;
    --secondary-color: #8B7355;
    --accent-color: #B8936B;
    --dark-text: #3E3630;
    --light-text: #7D7268;
    --background: #f6f5f3;
    --white: #FFFFFF;
    --border-color: #E5DDD5;
    --highlight-bg: #FAF8F5;
    
    /* Typography */
    --font-serif: 'Noto Serif JP', serif;
    
    /* Spacing */
    --section-padding: 80px 0;
    --container-max-width: 1200px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-serif);
    background-color: var(--background);
    color: var(--dark-text);
    line-height: 1.8;
    font-size: 19px;
    overflow-x: hidden;
}

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* PC only line break */
.pc-br {
    display: inline;
}

/* ==========================================
   Header
   ========================================== */
.header {
    background-color: var(--white);
    padding: 15px 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo img {
    height: 70px;
    width: auto;
}

.nav {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav a {
    color: var(--dark-text);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    font-size: 18px;
}

.nav a:hover {
    color: var(--accent-color);
}

.nav .cta-button {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 10px 25px;
    border-radius: 30px;
    transition: all 0.3s ease;
}

.nav .cta-button:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    transition: all 0.3s ease;
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
    background: linear-gradient(135deg, rgba(107, 93, 79, 0.9) 0%, rgba(139, 115, 85, 0.85) 100%),
                url('https://images.unsplash.com/photo-1576092768234-eb86c5e9f4e0?w=1600') center/cover;
    min-height: 450px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    position: relative;
}

.hero-content {
    padding: 60px 20px;
}

.hero-title {
    font-size: 3.3em;
    font-weight: 400;
    margin-bottom: 20px;
    letter-spacing: 2px;
}

.hero-title span {
    font-size: 0.6em;
    display: block;
    margin-top: 10px;
    font-weight: 300;
}

.hero-subtitle {
    font-size: 1.3em;
    font-weight: 300;
    margin-bottom: 30px;
    letter-spacing: 1px;
}

.hero-divider {
    width: 100px;
    height: 2px;
    background-color: var(--white);
    margin: 0 auto;
}

/* ==========================================
   Section Styles
   ========================================== */
.section {
    padding: var(--section-padding);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.8em;
    color: var(--primary-color);
    font-weight: 400;
    margin-bottom: 15px;
    letter-spacing: 1px;
}

.section-subtitle {
    color: var(--light-text);
    font-size: 1.2em;
    margin-top: 10px;
}

.title-divider {
    width: 80px;
    height: 2px;
    background-color: var(--accent-color);
    margin: 20px auto 0;
}

/* ==========================================
   About Section
   ========================================== */
.about-section {
    background-color: var(--white);
}

.about-intro {
    display: flex;
    gap: 50px;
    align-items: center;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.about-image {
    flex: 0 0 300px;
}

.about-image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.about-text {
    flex: 1;
}

.about-text h3 {
    font-size: 2em;
    color: var(--primary-color);
    line-height: 1.6;
    font-weight: 500;
}

.about-content {
    display: flex;
    flex-direction: column;
    gap: 50px;
}

.about-block {
    background-color: var(--background);
    padding: 40px;
    border-radius: 15px;
    border-left: 4px solid var(--accent-color);
}

.about-block.highlight {
    background: linear-gradient(135deg, var(--highlight-bg) 0%, var(--white) 100%);
    border-left: 4px solid var(--primary-color);
}

.about-block h4 {
    font-size: 1.7em;
    color: var(--primary-color);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.about-block h4 i {
    color: var(--accent-color);
}

.about-block p {
    margin-bottom: 20px;
    color: var(--dark-text);
    line-height: 2;
}

.about-block strong {
    color: var(--primary-color);
    font-weight: 700;
}

/* 下線付き強調 */
.underline {
    text-decoration: underline;
    text-decoration-color: var(--accent-color);
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
}

.underline.large {
    font-size: 1.25em;
}

/* 重要なメッセージ */
.important-message {
    margin: 30px 0;
    padding: 0;
    line-height: 2.2;
}

.about-with-image {
    display: flex;
    gap: 40px;
    align-items: flex-start;
    margin-top: 20px;
}

.about-with-image.reverse {
    flex-direction: row-reverse;
}

.about-text-column {
    flex: 1;
}

.about-image-column {
    flex: 0 0 350px;
}

.about-image-column img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

/* ==========================================
   Concept Section
   ========================================== */
.concept-section {
    background-color: var(--background);
}

.concept-intro {
    text-align: center;
    font-size: 1.25em;
    color: var(--dark-text);
    margin-bottom: 50px;
    line-height: 2;
}

.concept-main {
    margin-bottom: 60px;
}

.concept-main h3 {
    font-size: 2em;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.concept-main h3 i {
    color: var(--accent-color);
}

.main-concept {
    background: linear-gradient(135deg, var(--white) 0%, var(--highlight-bg) 100%);
    padding: 50px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    border: 2px solid var(--border-color);
}

.main-concept h4 {
    font-size: 1.8em;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.main-concept p {
    font-size: 1.2em;
    line-height: 2;
    color: var(--dark-text);
}

.concept-features {
    margin-top: 60px;
}

.concept-features > h3 {
    font-size: 2em;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.concept-features > h3 i {
    color: var(--accent-color);
}

.feature-card {
    background-color: var(--white);
    padding: 50px;
    border-radius: 15px;
    margin-bottom: 40px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-color) 0%, var(--accent-color) 100%);
}

.feature-number {
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 4em;
    color: var(--border-color);
    font-weight: bold;
}

.feature-card h4 {
    font-size: 1.8em;
    color: var(--primary-color);
    margin-bottom: 15px;
    padding-right: 100px;
}

.feature-subtitle {
    color: var(--light-text);
    font-size: 1.15em;
    margin-bottom: 30px;
    font-style: italic;
}

.feature-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.feature-item {
    background-color: var(--background);
    padding: 25px;
    border-radius: 10px;
}

.feature-item h5 {
    font-size: 1.35em;
    color: var(--primary-color);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.feature-item h5 i {
    color: var(--accent-color);
}

.feature-item p {
    color: var(--dark-text);
    line-height: 1.8;
}

/* ==========================================
   Gallery Section
   ========================================== */
.gallery-section {
    background-color: var(--white);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.gallery-item {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.gallery-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.15);
}

.gallery-item img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    display: block;
}

.gallery-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8) 0%, transparent 100%);
    padding: 30px 20px 20px;
    color: white;
}

.gallery-caption p {
    font-size: 1.1em;
    margin: 0;
    font-weight: 500;
}

.gallery-note {
    text-align: center;
    background: var(--background);
    padding: 35px;
    border-radius: 15px;
    border-left: 4px solid var(--accent-color);
}

.gallery-note p {
    font-size: 1.15em;
    color: var(--primary-color);
    line-height: 2;
    margin: 0;
    font-weight: 500;
}

/* ==========================================
   Lesson Section
   ========================================== */
.lesson-section {
    background-color: var(--white);
}

.lesson-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 50px;
}

.lesson-location h3,
.lesson-details h3 {
    font-size: 1.8em;
    color: var(--primary-color);
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.lesson-location h3 i,
.lesson-details h3 i {
    color: var(--accent-color);
}

.location-card {
    background-color: var(--background);
    padding: 0;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.location-image {
    width: 100%;
    height: 280px;
    overflow: hidden;
}

.location-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.location-card h4 {
    font-size: 1.6em;
    color: var(--primary-color);
    margin: 25px 35px 15px;
}

.location-card .address {
    font-size: 1.2em;
    color: var(--dark-text);
    margin: 0 35px 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.location-card .address i {
    color: var(--accent-color);
}

.venue-description {
    margin: 0 35px 25px;
    color: var(--light-text);
    line-height: 1.8;
}

.location-card .map-link {
    padding: 0 35px 35px;
}

.lesson-description {
    font-size: 1.15em;
    color: var(--dark-text);
    margin-bottom: 25px;
    line-height: 1.9;
}

/* ==========================================
   Contact Section
   ========================================== */
.contact-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
}

.contact-section .section-title {
    color: var(--white);
}

.contact-section .title-divider {
    background-color: var(--white);
}

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

.contact-description {
    font-size: 1.25em;
    line-height: 2;
    margin-bottom: 40px;
}

/* ==========================================
   Buttons
   ========================================== */
.btn-primary,
.btn-secondary,
.btn-line {
    display: inline-block;
    padding: 15px 40px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    font-size: 1.15em;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.btn-secondary {
    background-color: var(--white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-3px);
}

.btn-line {
    background-color: #06C755;
    color: var(--white);
    font-size: 1.35em;
    padding: 18px 50px;
    box-shadow: 0 10px 30px rgba(6, 199, 85, 0.3);
}

.btn-line:hover {
    background-color: #05B04D;
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(6, 199, 85, 0.4);
}

.btn-line i {
    margin-right: 10px;
}

/* ==========================================
   Footer
   ========================================== */
.footer {
    background-color: var(--dark-text);
    color: var(--white);
    padding: 50px 0 20px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 30px;
    margin-bottom: 30px;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo img {
    height: 80px;
    filter: brightness(0) invert(1);
}

.footer-info p {
    margin-bottom: 5px;
    color: rgba(255, 255, 255, 0.8);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9em;
}

/* ==========================================
   Responsive Design - Tablet
   ========================================== */
@media (max-width: 968px) {
    .hero-title {
        font-size: 2.5em;
    }
    
    .section-title {
        font-size: 2em;
    }
    
    .about-intro {
        flex-direction: column;
        text-align: center;
    }
    
    .about-image {
        flex: 0 0 100%;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .about-with-image,
    .about-with-image.reverse {
        flex-direction: column;
    }
    
    .about-image-column {
        flex: 0 0 100%;
        max-width: 500px;
        margin: 0 auto;
    }
    
    .feature-number {
        font-size: 3em;
        top: 15px;
        right: 20px;
    }
    
    .feature-card h4 {
        padding-right: 80px;
        font-size: 1.4em;
    }
    
    .main-concept {
        padding: 40px 30px;
    }
    
    .lesson-info {
        grid-template-columns: 1fr;
    }
}

/* ==========================================
   Responsive Design - Mobile
   ========================================== */
@media (max-width: 768px) {
    body {
        font-size: 17px;
    }
    
    .pc-br {
        display: none;
    }
    
    /* Header - Mobile */
    .logo img {
        height: 50px;
    }
    
    .nav {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background-color: var(--white);
        flex-direction: column;
        justify-content: flex-start;
        padding: 40px 20px;
        transition: left 0.3s ease;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        gap: 20px;
    }
    
    .nav.active {
        left: 0;
    }
    
    .nav a {
        font-size: 18px;
        padding: 15px 0;
        width: 100%;
        text-align: center;
    }
    
    .nav .cta-button {
        width: 100%;
        padding: 15px 30px;
        font-size: 16px;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(7px, 7px);
    }
    
    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }
    
    /* Hero - Mobile */
    .hero {
        min-height: 350px;
    }
    
    .hero-title {
        font-size: 2.3em;
    }
    
    .hero-subtitle {
        font-size: 1.1em;
    }
    
    /* Sections - Mobile */
    .section {
        padding: 50px 0;
    }
    
    .section-header {
        margin-bottom: 40px;
    }
    
    .section-title {
        font-size: 2em;
    }
    
    .section-subtitle {
        font-size: 1.1em;
    }
    
    /* About - Mobile */
    .about-intro {
        gap: 30px;
    }
    
    .about-text h3 {
        font-size: 1.6em;
    }
    
    .about-content {
        gap: 30px;
    }
    
    .about-block {
        padding: 25px;
    }
    
    .about-block h4 {
        font-size: 1.5em;
        flex-wrap: wrap;
    }
    
    .about-with-image {
        gap: 25px;
    }
    
    /* Concept - Mobile */
    .concept-intro {
        font-size: 1.1em;
    }
    
    .concept-main h3 {
        font-size: 1.7em;
        flex-wrap: wrap;
    }
    
    .main-concept {
        padding: 30px 20px;
    }
    
    .main-concept h4 {
        font-size: 1.5em;
    }
    
    .main-concept p {
        font-size: 1.1em;
    }
    
    .concept-features > h3 {
        font-size: 1.7em;
        flex-wrap: wrap;
    }
    
    /* Feature Cards - Mobile */
    .feature-card {
        padding: 30px 20px;
    }
    
    .feature-number {
        font-size: 2.5em;
        top: 10px;
        right: 15px;
    }
    
    .feature-card h4 {
        padding-right: 60px;
        font-size: 1.4em;
    }
    
    .feature-subtitle {
        font-size: 1.05em;
    }
    
    .feature-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .feature-item {
        padding: 20px;
    }
    
    .feature-item h5 {
        font-size: 1.25em;
    }
    
    /* Gallery - Mobile */
    .gallery-grid {
        grid-template-columns: 1fr;
        gap: 25px;
    }
    
    .gallery-item img {
        height: 250px;
    }
    
    .gallery-caption p {
        font-size: 1em;
    }
    
    .gallery-note {
        padding: 25px;
    }
    
    .gallery-note p {
        font-size: 1em;
    }
    
    /* Lesson - Mobile */
    .lesson-location h3,
    .lesson-details h3 {
        font-size: 1.6em;
        flex-wrap: wrap;
    }
    
    .location-image {
        height: 220px;
    }
    
    .location-card h4 {
        font-size: 1.4em;
        margin: 20px 25px 15px;
    }
    
    .location-card .address {
        font-size: 1.1em;
        flex-wrap: wrap;
        margin: 0 25px 15px;
    }
    
    .venue-description {
        margin: 0 25px 20px;
    }
    
    .location-card .map-link {
        padding: 0 25px 25px;
    }
    
    /* Contact - Mobile */
    .contact-description {
        font-size: 1.1em;
    }
    
    .btn-line {
        font-size: 1.25em;
        padding: 15px 40px;
        width: 100%;
    }
    
    /* Footer - Mobile */
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 20px;
    }
    
    .footer-logo img {
        height: 60px;
    }
    
    .footer-links {
        align-items: center;
    }
}

/* ==========================================
   Responsive Design - Small Mobile
   ========================================== */
@media (max-width: 480px) {
    body {
        font-size: 16px;
    }
    
    .hero {
        min-height: 300px;
    }
    
    .hero-title {
        font-size: 2em;
    }
    
    .hero-content {
        padding: 40px 15px;
    }
    
    .section {
        padding: 40px 0;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .section-title {
        font-size: 1.8em;
    }
    
    .about-block {
        padding: 20px;
    }
    
    .feature-card {
        padding: 25px 15px;
    }
    
    .feature-card h4 {
        font-size: 1.3em;
        padding-right: 50px;
    }
    
    .feature-number {
        font-size: 2em;
    }
    
    .btn-primary,
    .btn-secondary,
    .btn-line {
        padding: 12px 30px;
        font-size: 1.1em;
    }
}