/* =================================================
   存在の証明 - ポートフォリオスタイル
   テーマ: 創造性と保存性、有と無、生と死
   ================================================= */

/* フォントとベース設定 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@100;200;300;400;500;600;700;800;900&family=Noto+Serif+JP:wght@200;300;400;500;600;700;900&display=swap');

:root {
    /* 色彩の哲学 */
    --void: #000000;
    --existence: #ffffff;
    --liminal: #0a0a0a;
    --whisper: rgba(255, 255, 255, 0.03);
    --breath: rgba(255, 255, 255, 0.1);
    --pulse: rgba(255, 255, 255, 0.2);
    --manifestation: rgba(255, 255, 255, 0.4);
    --essence: rgba(255, 255, 255, 0.6);
    --transcendence: rgba(255, 255, 255, 0.9);
    
    /* 時間の感覚 */
    --instant: 0.1s;
    --moment: 0.3s;
    --breath-cycle: 4s;
    --existence-cycle: 8s;
    --eternity: 20s;
    
    /* 空間の定義 */
    --void-space: 0;
    --minimal-space: 4px;
    --whisper-space: 8px;
    --breath-space: 16px;
    --presence-space: 32px;
    --existence-space: 64px;
    --infinite-space: 128px;
    
    /* タイポグラフィの重み */
    --weightless: 100;
    --whisper-weight: 200;
    --breath-weight: 300;
    --presence-weight: 400;
    --manifestation-weight: 600;
    --transcendence-weight: 900;
}

/* 無の基盤 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    background: var(--void);
    color: var(--existence);
    line-height: 1.6;
    overflow-x: hidden;
    font-weight: var(--breath-weight);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 呼吸する背景 */
.breathing-void {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: radial-gradient(
        ellipse at center,
        var(--liminal) 0%,
        var(--void) 70%
    );
    z-index: -20;
    animation: breathe var(--breath-cycle) ease-in-out infinite;
}

@keyframes breathe {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.8; }
}

/* 存在のキャンバス */
#existence-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -10;
    pointer-events: none;
}

/* メイン構造 */
.existence-container {
    position: relative;
    z-index: 10;
    min-height: 100vh;
}

/* エーテルナビゲーション */
.ethereal-nav {
    position: fixed;
    right: var(--presence-space);
    top: 50%;
    transform: translateY(-50%);
    z-index: 1000;
    pointer-events: auto;
}

.nav-essence {
    display: flex;
    flex-direction: column;
    gap: var(--breath-space);
}

.nav-dot {
    display: block;
    width: 60px;
    height: 60px;
    border: 1px solid var(--breath);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--moment) ease;
    position: relative;
    text-decoration: none;
    color: var(--existence);
    margin-bottom: var(--breath-space);
}

.nav-dot::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    background: var(--existence);
    border-radius: 50%;
    opacity: 0;
    transition: all var(--moment) ease;
}

.nav-dot.active::before,
.nav-dot:hover::before {
    opacity: 0.3;
}

.nav-dot.active {
    border-color: var(--essence);
    box-shadow: 0 0 20px var(--whisper);
}

.nav-label {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 0.7rem;
    font-weight: var(--breath-weight);
    opacity: 0.8;
    z-index: 1;
    writing-mode: vertical-rl;
    text-orientation: mixed;
}

.nav-dot:hover .nav-label {
    opacity: 1;
}

/* セクション共通スタイル */
section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--infinite-space) var(--presence-space);
    opacity: 0;
    transform: translateY(50px);
    transition: all var(--existence-cycle) ease;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    pointer-events: none;
    z-index: 1;
}

section.active {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
    z-index: 10;
}

/* セクション1: 無 (Void) */
.void-section {
    text-align: center;
}

.existence-title {
    margin-bottom: var(--presence-space);
}

.void-text {
    font-family: 'Noto Serif JP', serif;
    font-size: clamp(3rem, 8vw, 8rem);
    font-weight: var(--weightless);
    letter-spacing: 0.2em;
    margin-bottom: var(--presence-space);
    display: flex;
    justify-content: center;
    gap: var(--whisper-space);
}

.char-morph {
    display: inline-block;
    animation: charMorph var(--eternity) ease-in-out infinite;
    animation-delay: calc(var(--i, 0) * 0.5s);
    opacity: 0.7;
    transition: all var(--moment) ease;
}

.char-morph:hover {
    opacity: 1;
    transform: scale(1.1);
    text-shadow: 0 0 20px var(--pulse);
}

@keyframes charMorph {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    25% { transform: translateY(-10px) rotate(1deg); }
    50% { transform: translateY(0) rotate(0deg); }
    75% { transform: translateY(10px) rotate(-1deg); }
}

.void-subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    font-weight: var(--whisper-weight);
    line-height: 2;
    opacity: 0.6;
    text-align: center;
}

.breathing-text {
    animation: breatheText var(--breath-cycle) ease-in-out infinite;
    animation-delay: calc(var(--i, 0) * 1s);
}

.breathing-text.delay-1 { animation-delay: 1s; }
.breathing-text.delay-2 { animation-delay: 2s; }

@keyframes breatheText {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* 存在の選択 */
.existence-choices {
    display: flex;
    gap: var(--infinite-space);
    margin-top: var(--presence-space);
    justify-content: center;
    align-items: center;
}

.existence-portal {
    position: relative;
    display: block;
    text-decoration: none;
    color: var(--existence);
    cursor: pointer;
    z-index: 100;
}

.portal-essence {
    position: relative;
    display: inline-block;
}

.portal-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 140px;
    height: 140px;
    border: 1px solid var(--breath);
    border-radius: 50%;
    animation: portalRing var(--breath-cycle) ease-out infinite;
    animation-delay: calc(var(--i, 0) * 1.3s);
}

.portal-ring:nth-child(1) { animation-delay: 0s; }
.portal-ring:nth-child(2) { animation-delay: 1.3s; }
.portal-ring:nth-child(3) { animation-delay: 2.6s; }

@keyframes portalRing {
    0% {
        transform: translate(-50%, -50%) scale(0.3);
        opacity: 1;
    }
    100% {
        transform: translate(-50%, -50%) scale(1.5);
        opacity: 0;
    }
}

.portal-core {
    position: relative;
    z-index: 1;
    width: 120px;
    height: 120px;
    border: 1px solid var(--essence);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--whisper);
    backdrop-filter: blur(10px);
    transition: all var(--moment) ease;
    text-align: center;
}

.portal-text {
    font-size: 0.9rem;
    font-weight: var(--manifestation-weight);
    margin-bottom: var(--minimal-space);
    line-height: 1.2;
}

.portal-subtitle {
    font-size: 0.7rem;
    opacity: 0.7;
    font-weight: var(--breath-weight);
}

.existence-portal:hover .portal-core {
    transform: scale(1.1);
    box-shadow: 0 0 40px var(--pulse);
    background: var(--breath);
}

.existence-portal:hover .portal-text {
    opacity: 1;
}

/* 哲学的メッセージ */
.existence-philosophy {
    margin-top: var(--presence-space);
    text-align: center;
    opacity: 0.6;
}

.philosophy-text {
    font-family: 'Noto Serif JP', serif;
    font-size: 1rem;
    line-height: 1.8;
    font-style: italic;
    font-weight: var(--breath-weight);
}

/* セクション2: 創造 (Creation) */
.creation-section {
    padding-top: var(--infinite-space);
}

.section-header {
    text-align: center;
    margin-bottom: var(--presence-space);
}

.section-title {
    font-family: 'Noto Serif JP', serif;
    font-size: clamp(2rem, 5vw, 4rem);
    font-weight: var(--breath-weight);
    margin-bottom: var(--breath-space);
}

.title-line {
    width: 60px;
    height: 1px;
    background: var(--essence);
    margin: 0 auto;
    animation: lineGrow var(--moment) ease;
}

@keyframes lineGrow {
    from { width: 0; }
    to { width: 60px; }
}

/* 作品グリッド */
.works-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--presence-space);
    max-width: 1200px;
    margin: 0 auto;
}

.work-item {
    background: var(--whisper);
    border: 1px solid var(--breath);
    backdrop-filter: blur(10px);
    padding: var(--presence-space);
    transition: all var(--moment) ease;
    cursor: pointer;
    opacity: 0;
    transform: translateY(30px);
    animation: workAppear var(--moment) ease forwards;
    animation-delay: calc(var(--i, 0) * 0.1s);
}

@keyframes workAppear {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.work-item:hover {
    background: var(--breath);
    border-color: var(--pulse);
    transform: translateY(-5px);
    box-shadow: 0 10px 40px var(--whisper);
}

.work-title {
    font-size: 1.2rem;
    font-weight: var(--manifestation-weight);
    margin-bottom: var(--whisper-space);
}

.work-description {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-bottom: var(--breath-space);
    line-height: 1.7;
}

.work-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--whisper-space);
}

.tech-tag {
    padding: var(--minimal-space) var(--whisper-space);
    background: var(--breath);
    border: 1px solid var(--pulse);
    border-radius: 2px;
    font-size: 0.8rem;
    font-weight: var(--breath-weight);
}

/* 創造の無 */
.creation-void {
    text-align: center;
    margin-top: var(--presence-space);
    opacity: 0.5;
}

.void-message {
    font-size: 1rem;
    margin-bottom: var(--breath-space);
    font-style: italic;
}

.potential-works {
    display: flex;
    justify-content: center;
    gap: var(--breath-space);
}

.potential-dot {
    width: 8px;
    height: 8px;
    background: var(--breath);
    border-radius: 50%;
    animation: potentialPulse var(--breath-cycle) ease-in-out infinite;
    animation-delay: calc(var(--i, 0) * 1s);
}

.potential-dot:nth-child(1) { animation-delay: 0s; }
.potential-dot:nth-child(2) { animation-delay: 1s; }
.potential-dot:nth-child(3) { animation-delay: 2s; }

@keyframes potentialPulse {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.2); }
}

/* セクション3: 保存 (Preservation) */
.preservation-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--presence-space);
    max-width: 1000px;
    margin: 0 auto;
}

.preservation-item {
    text-align: center;
    padding: var(--presence-space);
    background: var(--whisper);
    border: 1px solid var(--breath);
    backdrop-filter: blur(10px);
    transition: all var(--moment) ease;
    opacity: 0;
    transform: translateY(30px);
    animation: preservationAppear var(--moment) ease forwards;
    animation-delay: calc(var(--i, 0) * 0.2s);
}

@keyframes preservationAppear {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.preservation-item:hover {
    background: var(--breath);
    border-color: var(--pulse);
    transform: translateY(-5px);
}

.preservation-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--breath-space);
    position: relative;
}

.icon-morph {
    width: 100%;
    height: 100%;
    border: 2px solid var(--essence);
    border-radius: 50%;
    position: relative;
    animation: iconMorph var(--existence-cycle) ease-in-out infinite;
}

.icon-morph::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    background: var(--essence);
    border-radius: 50%;
    animation: coreFlicker var(--breath-cycle) ease-in-out infinite;
}

@keyframes iconMorph {
    0%, 100% { border-radius: 50%; }
    33% { border-radius: 0%; }
    66% { border-radius: 30%; }
}

@keyframes coreFlicker {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

.preservation-item h3 {
    font-size: 1.1rem;
    font-weight: var(--manifestation-weight);
    margin-bottom: var(--breath-space);
}

.preservation-item p {
    font-size: 0.9rem;
    opacity: 0.8;
    line-height: 1.7;
}

/* セクション4: 接触 (Contact) */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--presence-space);
    max-width: 800px;
    margin: 0 auto;
}

.contact-method {
    text-align: center;
    padding: var(--presence-space);
    background: var(--whisper);
    border: 1px solid var(--breath);
    backdrop-filter: blur(10px);
    transition: all var(--moment) ease;
    cursor: pointer;
    opacity: 0;
    transform: translateY(30px);
    animation: contactAppear var(--moment) ease forwards;
    animation-delay: calc(var(--i, 0) * 0.15s);
}

@keyframes contactAppear {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.contact-method:hover {
    background: var(--breath);
    border-color: var(--pulse);
    transform: translateY(-3px);
}

.contact-essence {
    width: 40px;
    height: 40px;
    margin: 0 auto var(--breath-space);
    position: relative;
}

.essence-core {
    width: 100%;
    height: 100%;
    border: 1px solid var(--essence);
    border-radius: 50%;
    animation: essencePulse var(--breath-cycle) ease-in-out infinite;
}

@keyframes essencePulse {
    0%, 100% { 
        transform: scale(1); 
        border-color: var(--essence);
    }
    50% { 
        transform: scale(1.1); 
        border-color: var(--transcendence);
        box-shadow: 0 0 20px var(--pulse);
    }
}

.contact-method h3 {
    font-size: 1rem;
    font-weight: var(--manifestation-weight);
    margin-bottom: var(--whisper-space);
}

.contact-method p {
    font-size: 0.9rem;
    opacity: 0.7;
    font-family: monospace;
}

.void-contemplation {
    text-align: center;
    font-family: 'Noto Serif JP', serif;
    font-size: 1rem;
    font-weight: var(--breath-weight);
    opacity: 0.6;
    line-height: 1.8;
    font-style: italic;
}

/* 作品モーダル */
.work-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 10000;
}

.work-modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-void {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--presence-space);
}

.modal-content {
    background: var(--liminal);
    border: 1px solid var(--breath);
    backdrop-filter: blur(20px);
    max-width: 800px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    animation: modalAppear var(--moment) ease;
}

@keyframes modalAppear {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(30px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-close {
    position: absolute;
    top: var(--breath-space);
    right: var(--breath-space);
    background: none;
    border: 1px solid var(--breath);
    color: var(--existence);
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--instant) ease;
    z-index: 1;
}

.modal-close:hover {
    background: var(--breath);
    border-color: var(--pulse);
}

.modal-body {
    padding: var(--presence-space);
}

/* 時間の存在 */
.time-existence {
    position: fixed;
    bottom: var(--presence-space);
    left: var(--presence-space);
    z-index: 1000;
    text-align: left;
    pointer-events: none;
}


.current-time {
    font-family: 'Noto Sans JP', monospace;
    font-size: 1.2rem;
    font-weight: var(--breath-weight);
    margin-bottom: var(--whisper-space);
    opacity: 0.6;
}

@keyframes timeFlicker {
    0%, 98% { opacity: 1; }
    99%, 100% { opacity: 0.5; }
}

.time-philosophy {
    font-size: 0.8rem;
    opacity: 0.4;
    font-style: italic;
    font-weight: var(--breath-weight);
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    :root {
        --presence-space: 16px;
        --infinite-space: 64px;
    }
    
    .ethereal-nav {
        position: fixed;
        top: var(--presence-space);
        left: 50%;
        transform: translateX(-50%);
        right: auto;
        z-index: 1000;
    }
    
    .nav-essence {
        flex-direction: row;
        gap: var(--breath-space);
        justify-content: center;
    }
    
    .nav-dot {
        width: 50px;
        height: 50px;
        margin-bottom: 0;
    }
    
    .nav-label {
        writing-mode: horizontal-tb;
        text-orientation: mixed;
        font-size: 0.6rem;
    }
    
    section {
        padding: calc(var(--presence-space) * 4) var(--presence-space) var(--presence-space);
    }
    
    .void-text {
        font-size: clamp(2rem, 10vw, 4rem);
        flex-direction: row;
        gap: var(--minimal-space);
        align-items: center;
        text-align: center;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .works-grid,
    .preservation-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--breath-space);
    }
    
    .time-existence {
        bottom: var(--breath-space);
        left: var(--breath-space);
    }
    
    .modal-void {
        padding: var(--breath-space);
    }
}

@media (max-width: 480px) {
    .nav-dot {
        width: 40px;
        height: 40px;
    }
    
    .nav-label {
        font-size: 0.5rem;
    }
    
    .char-morph {
        font-size: 0.8em;
    }
    
    .pulse-core {
        width: 60px;
        height: 60px;
        font-size: 0.8rem;
    }
    
    .pulse-ring {
        width: 80px;
        height: 80px;
    }
}

/* アクセシビリティ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* フォーカス状態 */
button:focus,
.nav-dot:focus {
    outline: 2px solid var(--essence);
    outline-offset: 2px;
}

/* 選択テキスト */
::selection {
    background: var(--pulse);
    color: var(--void);
}

::-moz-selection {
    background: var(--pulse);
    color: var(--void);
}

/* 文字モーフィングアニメーション（控えめで美しい） */
@keyframes charMorph {
    0%, 100% { 
        transform: scale(1);
        opacity: 0.8;
    }
    50% { 
        transform: scale(1.05);
        opacity: 1;
    }
}

@keyframes breatheText {
    0%, 100% { 
        opacity: 0.5;
        transform: translateY(0);
    }
    50% { 
        opacity: 0.9;
        transform: translateY(-2px);
    }
}

.char-morph {
    animation: charMorph 6s ease-in-out infinite;
}

.breathing-text {
    animation: breatheText 8s ease-in-out infinite;
}