/* ==========================================================================
   style.css (共通スタイル)
   ========================================================================== */

/* --- 1. 変数定義 --- */
:root {
    --bg-color: #0a0a0a;
    --text-color: #eeeeee;
    --line-color: rgba(255, 255, 255, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.15);
}

/* --- 2. ベーススタイル & リセット --- */
*, *::before, *::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

/* --- ページ遷移（フェードインエフェクト） --- */
.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 7rem 2rem 4rem;
}

.container > * {
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

body.page-loaded .container > * {
    opacity: 1;
    transform: none;
}

/* --- 3. 背景レイヤー & ギミック --- */
/* 線形グリッド（重複を統合） */
.bg-lines {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    background-image: 
        linear-gradient(var(--line-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--line-color) 1px, transparent 1px);
    background-size: 50px 50px;
}

/* マウス追従エフェクト（肉球型アイコン） */
#mouse-glow {
    position: fixed;
    top: 0;
    left: 0;
    width: 50px;
    height: 50px;
    z-index: -1;
    pointer-events: none;
    transform: translate(calc(var(--mouse-x) - 50%), calc(var(--mouse-y) - 50%)) rotate(-15deg);
    background: 
        radial-gradient(ellipse 4px 6px at 18% 52%, #ffffff 95%, transparent 100%),
        radial-gradient(ellipse 5px 7px at 38% 28%, #ffffff 95%, transparent 100%),
        radial-gradient(ellipse 5px 7px at 62% 28%, #ffffff 95%, transparent 100%),
        radial-gradient(ellipse 4px 6px at 82% 52%, #ffffff 95%, transparent 100%),
        radial-gradient(ellipse 10px 10px at 50% 72%, #ffffff 95%, transparent 100%);
    opacity: 0;
    transition: opacity 0.5s ease;
}

@media (hover: hover) and (pointer: fine) {
    #mouse-glow.is-active {
        opacity: 0.8;
    }
}

/* --- 4. 共通コンポーネント --- */
/* グラスモーフィズムパネル */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 4px;
    padding: 2.5rem;
    margin-bottom: 2rem;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}

/* 共通セクション見出し */
.section-title {
    font-size: 1.2rem;
    font-weight: 300;
    letter-spacing: 0.1em;
    border-bottom: 1px solid var(--line-color);
    padding-bottom: 0.8rem;
    margin-bottom: 1.5rem;
}

/* 共通線形ボタン */
.btn-linear {
    display: inline-block;
    padding: 0.8rem 2rem;
    color: var(--text-color);
    text-decoration: none;
    border: 1px solid var(--text-color);
    border-radius: 2px;
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    background: transparent;
    transition: all 0.3s ease;
}

.btn-linear:hover {
    background: var(--text-color);
    color: var(--bg-color);
}

/* --- 5. ヘッダー & ナビゲーション --- */
.glass-header {
    position: sticky;
    top: 0;
    background: rgba(10, 10, 10, 0.5);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--line-color);
    padding: 1rem 2rem;
    z-index: 100;
}

.header-inner {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    width: 100%;
}

.glass-header nav {
    display: flex;
    gap: 2rem;
    justify-content: center;
}

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    transition: opacity 0.3s ease;
}

.nav-link:hover, .nav-link.active {
    opacity: 0.6;
}

/* モバイル用メニューボタン */
.menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 44px;
    height: 44px;
    position: relative;
    z-index: 101;
    padding: 0;
}

.shape-square {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    border: 1px solid var(--text-color);
    transform: translate(-50%, -50%) rotate(0deg) scale(1);
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.4s ease;
}

.shape-cross {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 24px;
    height: 24px;
    transform: translate(-50%, -50%) rotate(45deg);
}

.shape-cross::before,
.shape-cross::after {
    content: '';
    position: absolute;
    background-color: var(--text-color);
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.shape-cross::before {
    top: 50%;
    left: 0;
    width: 100%;
    height: 1px;
    transform: translateY(-50%) scaleX(0);
}

.shape-cross::after {
    top: 0;
    left: 50%;
    width: 1px;
    height: 100%;
    transform: translateX(-50%) scaleY(0);
}

/* メニューアクティブ時 */
.menu-btn.is-active .shape-square {
    transform: translate(-50%, -50%) rotate(90deg) scale(0);
    opacity: 0;
}

.menu-btn.is-active .shape-cross::before {
    transform: translateY(-50%) scaleX(1);
}

.menu-btn.is-active .shape-cross::after {
    transform: translateX(-50%) scaleY(1);
}

/* レスポンシブ (タブレット・スマホ) */
@media (max-width: 768px) {
    .header-inner {
        justify-content: flex-end;
    }

    .menu-btn {
        display: block;
    }

    #global-nav {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(10, 10, 10, 0.85);
        backdrop-filter: blur(15px);
        -webkit-backdrop-filter: blur(15px);
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 3rem;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.4s ease, visibility 0.4s ease;
        z-index: 100;
    }

    #global-nav.is-open {
        opacity: 1;
        visibility: visible;
    }

    .nav-link {
        font-size: 1.5rem;
        letter-spacing: 0.15em;
    }
}

/* --- 6. ローディング画面 --- */
.glass-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: var(--bg-color);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease;
}

.loader-line {
    height: 1px;
    background: #ffffff;
    width: 0%;
    transition: width 0.3s ease;
}

/* --- 7. フッター --- */
.site-footer {
    margin-top: 4rem;
    padding: 2rem 1rem;
    border-top: 1px solid var(--line-color);
    text-align: center;
    background: rgba(10, 10, 10, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.footer-inner p {
    margin: 0;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    color: rgba(255, 255, 255, 0.4);
}

.footer-links {
    margin-top: 0.5rem !important;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.4);
    text-decoration: none;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}

.footer-links a:hover {
    color: rgba(255, 255, 255, 0.8);
    border-bottom-color: rgba(255, 255, 255, 0.8);
}