/* =====================================================
   common.css - 共通スタイル
   ===================================================== */

/* ===== CSS変数（共通） ===== */
:root {
    /* フォント */
    --font-rounded: 'M PLUS Rounded 1c', sans-serif;
    --font-sans-kr: 'Noto Sans KR', sans-serif;
    
    /* 共通カラー（ゴールド系） */
    --color-gold: #C9A84C;
    --color-gold-light: #E8D5A3;
    --color-gold-dark: #8B7332;
    --color-vermillion: #BA3C3C;
    --color-ink: #2A2A2A;
    --color-white: #FFFFFF;
    
    /* レイアウト - clamp(最小, 推奨, 最大) で滑らかに変化 */
    --container-max-width: 768px;
    --base-padding: clamp(16px, 4vw, 40px);
    --section-gap: clamp(16px, 4vw, 32px);
    
    /* フォントサイズ - clampで滑らかにスケール */
    --font-size-hero: clamp(28px, 7vw, 48px);
    --font-size-title: clamp(24px, 5vw, 36px);
    --font-size-section-title: clamp(16px, 4vw, 24px);
    --font-size-body: clamp(13px, 3.2vw, 17px);
    --font-size-small: clamp(11px, 2.8vw, 15px);
    --font-size-caption: clamp(10px, 2.5vw, 14px);
    
    /* スペーシング - 画面幅に応じて調整 */
    --spacing-xs: clamp(4px, 1vw, 8px);
    --spacing-sm: clamp(8px, 2vw, 16px);
    --spacing-md: clamp(12px, 3vw, 24px);
    --spacing-lg: clamp(20px, 5vw, 40px);
    --spacing-xl: clamp(32px, 8vw, 64px);
}

/* ===== リセット ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-rounded);
    color: var(--color-ink);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
}

a {
    text-decoration: none;
    color: inherit;
}

/* ===== メインコンテナ ===== */
.main-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    min-height: 100vh;
    position: relative;
}

/* ===== 言語切り替え ===== */
.lang-toggle {
    position: absolute;
    top: 8px;
    right: 8px;
    z-index: 100;
}

.lang-btn-toggle {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 5px 10px;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--color-gold);
    border-radius: 14px;
    color: var(--color-gold-dark);
    font-family: var(--font-rounded);
    font-size: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.lang-btn-toggle:hover {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 12px rgba(201, 168, 76, 0.2);
}

.lang-btn-toggle .globe {
    font-size: 11px;
}

.lang-btn-toggle .arrow {
    font-size: 6px;
    transition: transform 0.3s ease;
}

.lang-toggle.open .lang-btn-toggle .arrow {
    transform: rotate(180deg);
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    transform: translateY(-10px);
    background: var(--color-white);
    border: 2px solid var(--color-gold);
    border-radius: 12px;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    min-width: 100px;
}

.lang-dropdown.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: block;
    width: 100%;
    padding: 10px 16px;
    border: none;
    background: transparent;
    font-family: var(--font-rounded);
    font-size: 12px;
    color: var(--color-ink);
    cursor: pointer;
    text-align: center;
    transition: all 0.2s ease;
}

.lang-option:hover {
    background: var(--color-gold-light);
}

.lang-option.active {
    background: var(--color-gold);
    color: var(--color-white);
}

/* ===== 金の区切り線 ===== */
.gold-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 10px 0;
}

.gold-line {
    width: 60px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
}

.gold-diamond {
    width: 8px;
    height: 8px;
    background: var(--color-gold);
    transform: rotate(45deg);
}

/* ===== 戻るボタン ===== */
.back-section {
    padding: 30px var(--base-padding);
}

.back-button {
    display: block;
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--color-indigo, #264478), var(--color-indigo-deep, #1a2d4d));
    border: none;
    border-radius: 8px;
    color: var(--color-white);
    font-family: var(--font-rounded);
    font-size: var(--font-size-body);
    letter-spacing: 2px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    box-shadow: 0 4px 12px rgba(38, 68, 120, 0.3);
}

.back-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(38, 68, 120, 0.4);
}

/* ===== フッター ===== */
.footer {
    text-align: center;
    padding: 30px var(--base-padding) 40px;
    border-top: 1px solid var(--color-gold-light);
}

.footer-text {
    font-size: var(--font-size-caption);
    color: var(--color-ink);
    opacity: 0.5;
    letter-spacing: 1px;
}

/* ===== アプリ案内ボタン ===== */
.app-link-section {
    padding: 0 var(--base-padding) 20px;
}

.app-link-button {
    display: block;
    width: 100%;
    padding: 14px 16px;
    background: transparent;
    border: 2px solid var(--color-gold);
    border-radius: 8px;
    color: var(--color-gold-dark);
    font-family: var(--font-rounded);
    font-size: var(--font-size-small);
    letter-spacing: 1px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(201, 168, 76, 0.15);
}

.app-link-button:hover {
    background: var(--color-gold);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(201, 168, 76, 0.3);
}

.app-link-button .arrow {
    margin-left: 6px;
    font-size: 10px;
}

/* ===== 共通アニメーション ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =====================================================
   レスポンシブ対応 - 主要端末ブレークポイント
   ===================================================== */

/* ----- 小型スマホ（~374px）: iPhone SE等 ----- */
@media (max-width: 374px) {
    .lang-btn-toggle {
        padding: 4px 8px;
        font-size: 9px;
    }
    
    .lang-option {
        padding: 8px 12px;
        font-size: 11px;
    }
}

/* ----- 標準スマホ（375px~413px）: iPhone 12/13/14/15 ----- */
@media (min-width: 375px) and (max-width: 413px) {
    .lang-btn-toggle {
        padding: 5px 10px;
        font-size: 10px;
    }
}

/* ----- 大型スマホ（414px~599px）: iPhone Plus/Pro Max ----- */
@media (min-width: 414px) and (max-width: 599px) {
    .lang-btn-toggle {
        padding: 6px 12px;
        font-size: 11px;
    }
    
    .lang-option {
        padding: 12px 18px;
        font-size: 13px;
    }
    
    .gold-line {
        width: 80px;
        height: 2px;
    }
    
    .gold-diamond {
        width: 10px;
        height: 10px;
    }
}

/* ----- 小型タブレット（600px~767px）: iPad mini縦 ----- */
@media (min-width: 600px) and (max-width: 767px) {
    .lang-btn-toggle {
        padding: 7px 14px;
        font-size: 12px;
        border-radius: 18px;
    }
    
    .lang-btn-toggle .globe {
        font-size: 14px;
    }
    
    .lang-dropdown {
        min-width: 120px;
        border-radius: 14px;
    }
    
    .lang-option {
        padding: 12px 20px;
        font-size: 14px;
    }
    
    .gold-line {
        width: 100px;
        height: 2px;
    }
    
    .gold-diamond {
        width: 12px;
        height: 12px;
    }
    
    .back-button {
        padding: 18px 24px;
        font-size: 16px;
        border-radius: 10px;
    }
    
    .app-link-button {
        padding: 16px 20px;
        font-size: 14px;
        border-radius: 10px;
    }
}

/* ----- スマホ横向き対応（共通） ----- */
@media (min-width: 600px) and (max-width: 1023px) and (orientation: landscape) {
    .main-container {
        max-width: 100%;
    }
}

/* ----- タブレット標準（768px~1023px）: iPad縦 ----- */
@media (min-width: 768px) and (max-width: 1023px) {
    .lang-btn-toggle {
        padding: 8px 16px;
        font-size: 13px;
        border-radius: 20px;
    }
    
    .lang-btn-toggle .globe {
        font-size: 16px;
    }
    
    .lang-dropdown {
        min-width: 140px;
        border-radius: 16px;
    }
    
    .lang-option {
        padding: 14px 24px;
        font-size: 15px;
    }
    
    .gold-divider {
        gap: 16px;
        padding: 16px 0;
    }
    
    .gold-line {
        width: 120px;
        height: 2px;
    }
    
    .gold-diamond {
        width: 14px;
        height: 14px;
    }
    
    .back-button {
        padding: 20px 28px;
        font-size: 17px;
        border-radius: 12px;
    }
    
    .app-link-button {
        padding: 18px 24px;
        font-size: 15px;
        border-radius: 12px;
    }
    
    .footer {
        padding: 40px var(--base-padding) 50px;
    }
}

/* ----- 大画面（1024px~）: iPad横、PC ----- */
@media (min-width: 1024px) {
    .main-container {
        max-width: 100%;
        padding-left: calc((100vw - 800px) / 2);
        padding-right: calc((100vw - 800px) / 2);
    }
    
    .lang-btn-toggle {
        padding: 10px 18px;
        font-size: 14px;
        border-radius: 22px;
    }
    
    .lang-btn-toggle .globe {
        font-size: 18px;
    }
    
    .lang-dropdown {
        min-width: 160px;
        border-radius: 18px;
    }
    
    .lang-option {
        padding: 16px 28px;
        font-size: 16px;
    }
    
    .gold-divider {
        gap: 20px;
        padding: 20px 0;
    }
    
    .gold-line {
        width: 140px;
        height: 3px;
    }
    
    .gold-diamond {
        width: 16px;
        height: 16px;
    }
    
    .back-button {
        padding: 22px 32px;
        font-size: 18px;
        border-radius: 14px;
    }
    
    .app-link-button {
        padding: 20px 28px;
        font-size: 16px;
        border-radius: 14px;
    }
    
    .footer {
        padding: 50px var(--base-padding) 60px;
    }
}