/* ============================================================
   Online Lesson — Design System
   トンマナ：ゆずりはプロジェクト本サイトに準拠
   クリーム(#FFEFE1) × グリーン(#005D48)
============================================================ */

/* === CSS Variables === */
:root {
    --navy:        #005D48;
    --navy-deep:   #003d30;
    --navy-light:  #007a5e;
    --gold:        #C5A059;
    --gold-light:  #D4B870;
    --white:       #FFFFFF;
    --off-white:   #FFF5EC;
    --gray-100:    #F5EDE3;
    --gray-200:    #D8CFC4;
    --gray-400:    #9B9088;
    --gray-600:    #5C534A;
    --gray-800:    #2D2420;
    --text:        #1a1a1a;
    --text-sub:    #5C534A;

    --font-serif:  'Noto Serif JP', 'Yu Mincho', serif;
    --font-sans:   'Noto Sans JP', 'Yu Gothic', sans-serif;
    --font-en:     'Cormorant Garamond', Garamond, Georgia, serif;

    --max-w:       1100px;
    --pad-x:       40px;
}

/* === Reset === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.85;
    color: var(--text);
    background: #FFEFE1;
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a   { text-decoration: none; color: inherit; transition: color 0.2s; }

/* ============================================================
   HEADER
============================================================ */
.site-header {
    background: #FFEFE1;
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 100;
    height: 68px;
}

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

.site-logo img {
    height: 40px;
    width: auto;
    display: block;
}

.site-title {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    color: var(--navy);
}
.site-title a { color: inherit; }

.header-nav { display: flex; align-items: center; gap: 4px; }

.header-nav a {
    font-size: 0.82rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--gray-800);
    padding: 8px 14px;
    transition: color 0.2s;
}
.header-nav a:hover { color: var(--navy); }

/* Header Buttons */
.btn-header {
    padding: 7px 18px;
    border: 1px solid var(--navy);
    color: var(--navy);
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    background: transparent;
    display: inline-block;
    transition: all 0.2s;
    margin-left: 8px;
}
.btn-header:hover { background: var(--navy); color: var(--white); }

.btn-header-fill {
    padding: 7px 18px;
    background: var(--navy);
    color: var(--white);
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    border: 1px solid var(--navy);
    display: inline-block;
    transition: background 0.2s;
    margin-left: 8px;
}
.btn-header-fill:hover { background: var(--navy-light); color: var(--white); }

/* Hamburger */
.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 36px;
    height: 36px;
    padding: 0;
}
.hamburger span { width: 20px; height: 1.5px; background: var(--navy); display: block; }

/* ============================================================
   MAIN CONTENT
============================================================ */
.page-wrap {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 56px var(--pad-x) 100px;
}

.page-label {
    font-family: var(--font-en);
    font-size: 0.7rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--gold);
    display: block;
    margin-bottom: 10px;
}

.page-title {
    font-family: var(--font-serif);
    font-size: 1.9rem;
    font-weight: 400;
    color: var(--navy);
    letter-spacing: 0.02em;
    margin-bottom: 48px;
}

/* ============================================================
   LESSON CARDS (INDEX)
============================================================ */
.lesson-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.lesson-card {
    border: 1px solid var(--gray-200);
    background: var(--white);
    transition: box-shadow 0.2s;
}
.lesson-card:hover { box-shadow: 0 4px 24px rgba(0,93,72,0.12); }

.lesson-card-thumb {
    width: 100%;
    aspect-ratio: 16/9;
    background: var(--gray-100);
    overflow: hidden;
}
.lesson-card-thumb img { width: 100%; height: 100%; object-fit: cover; }
.lesson-card-thumb.no-thumb { display: flex; align-items: center; justify-content: center; }
.lesson-card-thumb.no-thumb::before {
    content: 'LESSON';
    font-family: var(--font-en);
    font-size: 0.68rem;
    letter-spacing: 0.22em;
    color: var(--gray-400);
}

.lesson-card-body { padding: 20px 22px 24px; }

.lesson-card-title {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 400;
    color: var(--navy);
    line-height: 1.55;
    margin-bottom: 8px;
}

.lesson-card-date {
    font-size: 0.78rem;
    color: var(--text-sub);
    letter-spacing: 0.06em;
    margin-bottom: 16px;
}

.lesson-card-desc {
    font-size: 0.82rem;
    color: var(--text-sub);
    line-height: 1.7;
    margin-bottom: 12px;
}

.lesson-card-price {
    font-size: 1rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 14px;
    font-family: var(--font-en);
}

.lesson-card-link {
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    color: var(--gold);
    border-bottom: 1px solid var(--gold);
    transition: color 0.2s, border-color 0.2s;
}
.lesson-card-link:hover { color: var(--navy); border-color: var(--navy); }

.empty-message {
    padding: 60px 0;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-sub);
}

/* ============================================================
   PANELS / NOTICE BOXES
============================================================ */
.ev-panel {
    border: 1px solid var(--gray-200);
    border-top: 3px solid var(--navy);
    background: var(--off-white);
    padding: 32px 36px;
    margin-bottom: 40px;
}
.ev-panel-title {
    font-family: var(--font-serif);
    font-size: 0.95rem;
    color: var(--navy);
    margin: 0 0 16px;
    letter-spacing: 0.04em;
}
.ev-panel-body {
    font-size: 0.9rem;
    color: var(--text-sub);
    line-height: 1.75;
    margin: 0 0 20px;
}

.ev-notice {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    background: var(--off-white);
    border: 1px solid var(--gray-200);
    border-left: 4px solid var(--gold);
    padding: 16px 20px;
    margin-bottom: 40px;
    font-size: 0.9rem;
    color: var(--text);
}
.ev-notice-icon { color: var(--gold); font-size: 1.1rem; flex-shrink: 0; }

/* ============================================================
   ZOOM BUTTON
============================================================ */
.btn-zoom {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: #2D8CFF;
    color: #fff;
    padding: 14px 28px;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-decoration: none;
    transition: background 0.2s;
}
.btn-zoom:hover { background: #1a75e8; color: #fff; }
.btn-zoom-icon {
    width: 22px; height: 22px;
    background: rgba(255,255,255,0.25);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.85rem; flex-shrink: 0;
}
.zoom-note { font-size: 0.78rem; color: var(--text-sub); margin-top: 12px; }

/* ============================================================
   VIDEO ARCHIVE
============================================================ */
.archive-video-wrapper {
    background: #000;
    margin-bottom: 0;
}
.responsive-video-wrapper {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
}
.responsive-video-wrapper iframe {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    border: none;
}
.video-switcher-container {
    display: flex;
    gap: 4px;
    padding: 12px 16px;
    background: #111;
    flex-wrap: wrap;
}
.video-tab-button {
    padding: 6px 16px;
    background: none;
    border: 1px solid rgba(255,255,255,0.2);
    color: rgba(255,255,255,0.6);
    font-size: 0.8rem;
    cursor: pointer;
    font-family: var(--font-sans);
    transition: all 0.2s;
}
.video-tab-button.active,
.video-tab-button:hover {
    background: var(--gold);
    border-color: var(--gold);
    color: #fff;
}

/* ============================================================
   PLAN / CHECKOUT
============================================================ */
.plan-box {
    border: 1px solid var(--gray-200);
    padding: 28px 28px 24px;
    margin-bottom: 24px;
    background: var(--white);
}
.plan-name {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    color: var(--navy);
    margin-bottom: 6px;
}
.plan-price {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 12px;
    font-family: var(--font-en);
}
.plan-price small { font-size: 0.8rem; font-weight: 400; }
.plan-desc {
    font-size: 0.85rem;
    color: var(--text-sub);
    line-height: 1.7;
    margin-bottom: 16px;
}

.btn-reserve {
    display: inline-block;
    padding: 12px 32px;
    background: var(--navy);
    color: var(--white);
    font-size: 0.85rem;
    letter-spacing: 0.08em;
    border: none;
    cursor: pointer;
    font-family: var(--font-sans);
    transition: background 0.2s;
}
.btn-reserve:hover { background: var(--gold); }
.btn-reserve:disabled { background: var(--gray-400); cursor: not-allowed; }

/* ============================================================
   AUTH PAGES
============================================================ */
.auth-page {
    min-height: 100vh;
    background: #FFEFE1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
}
.auth-brand {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    font-weight: 400;
    color: var(--navy);
    letter-spacing: 0.12em;
    margin-bottom: 32px;
    text-decoration: none;
    display: block;
}
.auth-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-top: 3px solid var(--navy);
    padding: 48px 40px;
    width: 100%;
    max-width: 420px;
}
.auth-heading {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    font-weight: 400;
    color: var(--navy);
    margin: 0 0 4px;
    letter-spacing: 0.02em;
}
.auth-subheading {
    font-family: var(--font-en);
    font-size: 0.72rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--gold);
    margin: 0 0 32px;
}
.auth-error {
    font-size: 0.82rem;
    color: #a94442;
    border-left: 3px solid #a94442;
    background: #fdf2f2;
    padding: 10px 14px;
    margin-bottom: 20px;
}
.auth-success {
    font-size: 0.82rem;
    color: #2e7d32;
    border-left: 3px solid #2e7d32;
    background: #f2fdf4;
    padding: 10px 14px;
    margin-bottom: 20px;
}
.auth-form .field { margin-bottom: 20px; }
.auth-form label {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--gray-600);
    margin-bottom: 6px;
    letter-spacing: 0.03em;
}
.auth-form input[type="text"],
.auth-form input[type="email"],
.auth-form input[type="password"],
.auth-form input[type="tel"] {
    display: block;
    width: 100%;
    padding: 10px 12px;
    font-size: 0.9rem;
    font-family: var(--font-sans);
    border: 1px solid var(--gray-200);
    color: var(--text);
    background: var(--white);
    outline: none;
    transition: border-color 0.2s;
    border-radius: 0;
}
.auth-form input:focus { border-color: var(--navy); }

.btn-auth {
    width: 100%;
    padding: 12px;
    background: var(--navy);
    color: var(--white);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    border: none;
    cursor: pointer;
    transition: background 0.2s;
    margin-top: 8px;
}
.btn-auth:hover { background: var(--gold); }

.auth-links {
    margin-top: 24px;
    font-size: 0.82rem;
    color: var(--text-sub);
    text-align: center;
}
.auth-links a {
    color: var(--navy);
    border-bottom: 1px solid var(--gray-200);
    transition: border-color 0.2s;
}
.auth-links a:hover { border-color: var(--navy); }

/* ============================================================
   FOOTER
============================================================ */
footer {
    background: var(--navy);
    padding: 56px 0 32px;
}
.footer-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 var(--pad-x);
}
.footer-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding-bottom: 40px;
    margin-bottom: 32px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand {
    font-family: var(--font-serif);
    font-size: 1rem;
    color: var(--white);
    letter-spacing: 0.12em;
    margin-bottom: 12px;
}
.footer-desc {
    font-size: 0.78rem;
    color: rgba(255,255,255,0.38);
    line-height: 1.9;
}
.footer-nav { display: flex; gap: 48px; }
.footer-nav-col h4 {
    font-family: var(--font-en);
    font-size: 0.68rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 16px;
}
.footer-nav-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-nav-col ul a { font-size: 0.8rem; color: rgba(255,255,255,0.48); }
.footer-nav-col ul a:hover { color: var(--white); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; }
.footer-copy {
    font-family: var(--font-en);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    color: rgba(255,255,255,0.25);
}

/* ============================================================
   RESPONSIVE
============================================================ */
@media (max-width: 960px) {
    .lesson-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    :root { --pad-x: 20px; }

    .site-header { height: 60px; }
    .header-nav { display: none; }
    .hamburger { display: flex; }

    .page-title { font-size: 1.4rem; }
    .page-wrap  { padding: 36px var(--pad-x) 64px; }
    .ev-panel   { padding: 24px 20px; }

    .footer-top { flex-direction: column; gap: 32px; }
    .footer-nav { flex-direction: column; gap: 24px; }
    .footer-bottom { flex-direction: column; gap: 10px; text-align: center; }
}

@media (max-width: 540px) {
    .lesson-grid { grid-template-columns: 1fr; }
    .auth-card { padding: 36px 24px; }
}