/* ─────────────────────────────────────
   Yoga Studio Lumi 中級サンプル共通スタイル
   ─────────────────────────────────────  */

/* 1. CSS VARIABLES */
:root {
    --color-base: #ffffff;
    --color-section: #f8f6f3;
    --color-ink: #2c3e50;
    --color-mid: #555;
    --color-muted: #888;
    --color-line: rgba(0, 0, 0, 0.08);
    --color-accent: #b8a88a;
    --color-accent-dark: #9a8c70;

    --font-jp: 'Noto Sans JP', system-ui, sans-serif;
    --font-en: 'Cormorant Garamond', serif;

    --container: 1200px;
    --radius: 6px;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 25px 60px rgba(0, 0, 0, 0.08);
    --easing: cubic-bezier(0.4, 0, 0.2, 1);

    color-scheme: light;
}

/* 2. RESET & BASE */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-jp);
    font-weight: 400;
    color: var(--color-ink);
    background: var(--color-base);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: opacity 0.3s; }
a:hover { opacity: 0.7; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 2rem; }

/* 3. LOADER */
.loader {
    position: fixed;
    inset: 0;
    background: var(--color-base);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.6s, visibility 0.6s;
}
.loader.hidden { opacity: 0; visibility: hidden; }
.loader-circle {
    width: 50px;
    height: 50px;
    border: 2px solid var(--color-line);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* 4. HEADER
   注意：ヘッダーに backdrop-filter / transform / filter / perspective / contain 等を使うと、
   その内側にある position: fixed 要素（ハンバーガーメニュー等）が「ヘッダー内」に閉じ込められる。
   ハンバーガーメニューを画面全体に広げるため、ここでは backdrop-filter は使わず、
   不透明な背景＋border のみで分離する。 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-base);
    border-bottom: 1px solid var(--color-line);
    z-index: 100;
    transition: padding 0.3s;
}
.header-inner {
    max-width: var(--container);
    margin: 0 auto;
    padding: 1.2rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

/* ナビと CTA ボタンを横並びに（PC） */
.nav-cta-wrap {
    display: flex;
    align-items: center;
    gap: 2rem;
}
.logo {
    font-family: var(--font-en);
    font-size: 1.4rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    font-style: italic;
    color: var(--color-ink);
}
.nav-list { display: flex; gap: 2rem; }
.nav-link {
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    color: var(--color-mid);
    position: relative;
    padding: 0.3rem 0;
}
.nav-link:hover, .nav-link.is-active { color: var(--color-ink); opacity: 1; }
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-accent);
    transition: width 0.4s var(--easing);
}
.nav-link:hover::after, .nav-link.is-active::after { width: 100%; }

.cta-button {
    background: var(--color-ink);
    color: var(--color-base);
    padding: 0.7rem 1.4rem;
    border-radius: var(--radius);
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    font-weight: 500;
    transition: background 0.3s, transform 0.3s;
}
.cta-button:hover { background: var(--color-accent-dark); opacity: 1; transform: translateY(-1px); }

/* HAMBURGER */
.hamburger {
    display: none;
    width: 30px;
    height: 22px;
    position: relative;
    z-index: 110;
    background: none;
    border: none;
    cursor: pointer;
}
.hamburger span {
    display: block;
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-ink);
    transition: all 0.4s var(--easing);
}
.hamburger span:nth-child(1) { top: 0; }
.hamburger span:nth-child(2) { top: 10px; }
.hamburger span:nth-child(3) { top: 20px; }
.hamburger.is-open span:nth-child(1) { top: 10px; transform: rotate(45deg); }
.hamburger.is-open span:nth-child(2) { opacity: 0; }
.hamburger.is-open span:nth-child(3) { top: 10px; transform: rotate(-45deg); }

@media (max-width: 768px) {
    .hamburger { display: block; }
    .nav-cta-wrap {
        position: fixed;
        inset: 0;
        background: var(--color-base);
        padding: 6rem 2rem 2rem;
        transform: translateX(100%);
        transition: transform 0.4s var(--easing);
        z-index: 105;
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
    }
    .nav-cta-wrap.is-open { transform: translateX(0); }
    .nav-list { flex-direction: column; gap: 1.5rem; align-items: flex-start; }
    .nav-link { font-size: 1.1rem; }
    .cta-button { margin-top: 2rem; text-align: center; }
}

/* 5. MAIN PADDING for fixed header */
main { padding-top: 70px; }

/* 6. HERO (TOP PAGE) */
.hero {
    position: relative;
    height: 80vh;
    min-height: 540px;
    overflow: hidden;
}
.hero-slider, .hero-slide {
    width: 100%;
    height: 100%;
}
.hero-slide {
    position: relative;
    background-size: cover;
    background-position: center;
}
.hero-slide::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0,0,0,.25), rgba(0,0,0,.45));
}
.hero-content {
    position: absolute;
    inset: 0;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
    padding: 0 2rem;
}
.hero-eyebrow {
    font-family: var(--font-en);
    font-size: 0.85rem;
    letter-spacing: 0.3em;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}
.hero-title {
    font-size: clamp(2rem, 5vw, 3.8rem);
    font-weight: 700;
    line-height: 1.4;
    letter-spacing: 0.05em;
    margin-bottom: 2rem;
}
.hero-subtitle {
    font-size: clamp(0.95rem, 1.5vw, 1.1rem);
    max-width: 600px;
    margin: 0 auto 2.5rem;
    line-height: 2;
    opacity: 0.95;
}
.hero-cta {
    display: inline-block;
    background: rgba(255, 255, 255, 0.95);
    color: var(--color-ink);
    padding: 1rem 2.5rem;
    border-radius: 100px;
    font-weight: 500;
    letter-spacing: 0.1em;
    transition: transform 0.3s;
}
.hero-cta:hover { transform: translateY(-3px); opacity: 1; }

/* Swiper dots */
.swiper-pagination-bullet { background: rgba(255,255,255,0.5); width: 10px; height: 10px; opacity: 1; }
.swiper-pagination-bullet-active { background: #fff; }

/* 7. PAGE HERO (for subpages) */
.page-hero {
    background: var(--color-section);
    padding: 8rem 0 4rem;
    text-align: center;
}
.page-hero h1 {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 600;
    line-height: 1.5;
    letter-spacing: 0.05em;
}
.page-hero .breadcrumb {
    font-family: var(--font-en);
    font-size: 0.8rem;
    color: var(--color-muted);
    letter-spacing: 0.15em;
    margin-bottom: 1.5rem;
}
.page-hero .breadcrumb a { color: var(--color-mid); }

/* 8. SECTION COMMON */
.section { padding: 6rem 0; }
.section.alt { background: var(--color-section); }
.section-label {
    font-family: var(--font-en);
    font-size: 0.8rem;
    letter-spacing: 0.4em;
    color: var(--color-accent);
    text-transform: uppercase;
    margin-bottom: 1rem;
    display: inline-block;
}
.section-title {
    font-size: clamp(1.6rem, 3.5vw, 2.4rem);
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 1.2rem;
    letter-spacing: 0.05em;
}
.section-lead {
    color: var(--color-mid);
    margin-bottom: 3rem;
    font-size: 1rem;
}
.text-center { text-align: center; }

/* 9. CARDS GRID */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}
.card {
    background: #fff;
    border: 1px solid var(--color-line);
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform 0.4s, box-shadow 0.4s;
}
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.card-image {
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background: var(--color-section);
}
.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s;
}
.card:hover .card-image img { transform: scale(1.05); }
.card-body { padding: 1.8rem 1.5rem; }
.card-meta {
    font-family: var(--font-en);
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    color: var(--color-accent);
    margin-bottom: 0.6rem;
    text-transform: uppercase;
}
.card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
    line-height: 1.6;
}
.card p { color: var(--color-mid); font-size: 0.95rem; line-height: 1.9; margin-bottom: 1rem; }
.card-link {
    font-family: var(--font-en);
    font-size: 0.85rem;
    letter-spacing: 0.15em;
    color: var(--color-ink);
    border-bottom: 1px solid var(--color-ink);
    padding-bottom: 2px;
    font-weight: 500;
}

/* 10. CTA SECTION */
.cta-section {
    background: var(--color-ink);
    color: #fff;
    padding: 5rem 0;
    text-align: center;
}
.cta-section h2 { color: #fff; }
.cta-section p { color: rgba(255,255,255,0.8); margin-bottom: 2rem; }
.cta-section .cta-button { background: var(--color-accent); padding: 1rem 2.5rem; font-size: 1rem; }
.cta-section .cta-button:hover { background: var(--color-accent-dark); }

/* 11. FOOTER */
.footer {
    background: var(--color-section);
    padding: 4rem 0 2rem;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}
.footer h4 {
    font-size: 0.85rem;
    letter-spacing: 0.15em;
    margin-bottom: 1rem;
    color: var(--color-mid);
}
.footer ul li { margin-bottom: 0.5rem; }
.footer-info p { font-size: 0.9rem; color: var(--color-mid); line-height: 1.9; }
.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--color-line);
    text-align: center;
    font-size: 0.8rem;
    color: var(--color-muted);
    letter-spacing: 0.1em;
}
@media (max-width: 768px) {
    .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
}

/* 12. TIMETABLE */
.timetable {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}
.timetable th, .timetable td {
    padding: 0.8rem 0.5rem;
    text-align: center;
    border: 1px solid var(--color-line);
}
.timetable th {
    background: var(--color-section);
    font-weight: 600;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
}
.timetable .lesson-morning { background: rgba(184, 168, 138, 0.1); }
.timetable .lesson-evening { background: rgba(184, 168, 138, 0.05); }
.timetable .lesson-power { background: rgba(184, 168, 138, 0.15); }

/* 13. INSTRUCTORS */
.instructor-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}
.instructor {
    text-align: center;
}
.instructor-photo {
    aspect-ratio: 1 / 1;
    border-radius: 50%;
    overflow: hidden;
    width: 200px;
    margin: 0 auto 1.5rem;
}
.instructor-photo img { width: 100%; height: 100%; object-fit: cover; }
.instructor h3 { font-size: 1.2rem; font-weight: 600; margin-bottom: 0.3rem; }
.instructor .role {
    font-family: var(--font-en);
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    margin-bottom: 1rem;
    display: block;
}
.instructor p { color: var(--color-mid); font-size: 0.9rem; }

/* 14. FORM */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
}
.form-row { margin-bottom: 1.5rem; }
.form-row label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    letter-spacing: 0.05em;
}
.form-row label .required {
    color: #e74c3c;
    font-size: 0.75rem;
    margin-left: 0.4rem;
}
.form-row input, .form-row textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid var(--color-line);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 1rem;
    background: #fff;
    transition: border-color 0.3s;
}
.form-row input:focus, .form-row textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}
.form-row textarea { min-height: 140px; resize: vertical; }
.form-row.has-error input, .form-row.has-error textarea { border-color: #e74c3c; }
.form-error {
    color: #e74c3c;
    font-size: 0.8rem;
    margin-top: 0.3rem;
    display: none;
}
.form-row.has-error .form-error { display: block; }
.form-submit {
    background: var(--color-ink);
    color: #fff;
    padding: 1rem 3rem;
    border-radius: var(--radius);
    font-size: 0.95rem;
    letter-spacing: 0.1em;
    font-weight: 500;
    transition: background 0.3s;
    display: block;
    margin: 0 auto;
    min-width: 200px;
}
.form-submit:hover { background: var(--color-accent-dark); }
.form-submit:disabled { opacity: 0.5; cursor: not-allowed; }

/* 15. MODAL */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}
.modal.is-open { opacity: 1; visibility: visible; }
.modal-body {
    background: #fff;
    padding: 3rem 2rem;
    border-radius: var(--radius);
    max-width: 400px;
    text-align: center;
    margin: 1rem;
}
.modal-body h3 { margin-bottom: 1rem; }
.modal-body p { color: var(--color-mid); margin-bottom: 1.5rem; }
.modal-close {
    background: var(--color-ink);
    color: #fff;
    padding: 0.6rem 1.5rem;
    border-radius: var(--radius);
    font-size: 0.9rem;
}

/* 16. FAQ */
.faq {
    max-width: 720px;
    margin: 0 auto;
}
.faq-item {
    border-bottom: 1px solid var(--color-line);
    padding: 1.5rem 0;
}
.faq-item summary {
    cursor: pointer;
    font-weight: 500;
    list-style: none;
    position: relative;
    padding-right: 2rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
    content: '+';
    position: absolute;
    right: 0;
    top: -3px;
    font-size: 1.4rem;
    color: var(--color-accent);
    transition: transform 0.3s;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p {
    margin-top: 1rem;
    color: var(--color-mid);
    font-size: 0.95rem;
}

/* 17. ACCESS */
.access-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem 2rem;
    margin-top: 2rem;
}
.access-info dt {
    font-family: var(--font-en);
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    color: var(--color-accent);
    margin-bottom: 0.3rem;
}
.access-info dd { font-weight: 500; }

/* 18. ABOUT TWO-COLUMN */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}
.two-col-image img {
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    aspect-ratio: 4 / 5;
    object-fit: cover;
    width: 100%;
}
@media (max-width: 768px) {
    .two-col { grid-template-columns: 1fr; gap: 2rem; }
    .section { padding: 4rem 0; }
    .page-hero { padding: 6rem 0 3rem; }
}