/* ========================================
   基本設定
======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4d3b32;
    --accent-color: #75aaa9;
    --bg-gradient-start: #FFF3b8;
    --bg-gradient-end: #Fcc8d1;
    --white: #ffffff;
    --shadow: rgba(77, 59, 50, 0.15);
}

body {
    font-family: "M PLUS 1p", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--primary-color);
    background: linear-gradient(to right, var(--bg-gradient-start), var(--bg-gradient-end));
    min-height: 100vh;
}

/* ========================================
   レガシーページ用のベーススタイル
======================================== */
.main {
    font-family: "M PLUS 1p", sans-serif;
    font-size: 1.2rem;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(to right, #FFF3b8, #Fcc8d1);
    position: relative;
    overflow: hidden;
}

.career-page {
    overflow: auto;
}

/* ========================================
   固定ナビゲーション
======================================== */
.fixed-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px var(--shadow);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* レガシーページのナビゲーション */
.main nav:not(.fixed-nav) {
    display: flex;
    width: 80%;
    margin: 20px auto;
    align-items: center;
    font-weight: 550;
    font-family: "Abril Fatface", serif;
    justify-content: space-between;
    position: relative;
    z-index: 3;
}

.main .nav-links {
    flex: 1;
    text-align: right;
}

.main .nav-links li {
    list-style: none;
}

.logo {
    height: 50px;
    width: auto;
    transition: transform 0.3s ease;
}

.main .logo {
    width: auto;
    height: 50px;
    z-index: 3;
}

.logo:hover {
    transform: scale(1.05);
}

.logo-area {
    flex-shrink: 0;
}

.main .nav-links ul {
    display: flex;
    justify-content: flex-end;
}

.main .nav-links li {
    list-style: none;
    margin-left: 20px;
}

.nav-links ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    position: relative;
    padding: 0.5rem 0;
    transition: color 0.3s ease;
}

.main .nav-links ul a {
    font-weight: 600;
    color: #4d3b32;
    text-decoration: none;
    transition: 0.3s;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-color);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.main .nav-links ul a:hover {
    color: #75aaa9;
}

/* ハンバーガーメニュー */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    transition: all 0.3s ease;
    border-radius: 3px;
}

/* ========================================
   メインコンテンツ
======================================== */
.main-content {
    padding-top: 80px;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.section-title {
    font-size: clamp(2rem, 3.5vw, 2.5rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary-color);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--accent-color);
    margin: 1rem auto 0;
    border-radius: 2px;
}

/* ========================================
   ヒーローセクション
======================================== */
.hero-section {
    padding: 4rem 2rem;
}

.hero-container {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 4rem;
    background: rgba(255, 255, 255, 0.8);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: 0 10px 40px var(--shadow);
}

.hero-image {
    flex-shrink: 0;
}

.hero-image img {
    width: 300px;
    height: 300px;
    object-fit: cover;
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow);
}

.hero-text {
    flex: 1;
}

.hero-title {
    font-size: clamp(2rem, 3.5vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
    font-family: 'M PLUS Rounded 1c', sans-serif;
}

.hero-subtitle {
    font-size: clamp(1rem, 1.8vw, 1.2rem);
    color: var(--accent-color);
    margin-bottom: 1.5rem;
    font-family: "Abril Fatface", serif;
}

.hero-description {
    font-size: clamp(0.95rem, 1.5vw, 1.1rem);
    line-height: 1.8;
    color: var(--primary-color);
}

/* ========================================
   興味・活動セクション
======================================== */
.interests-section {
    padding: 4rem 2rem;
}

.interests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.interest-card {
    background: rgba(255, 255, 255, 0.9);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 20px var(--shadow);
    transition: all 0.3s ease;
}

.interest-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(77, 59, 50, 0.2);
}

.card-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
}

.card-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.interest-card h3 {
    font-size: clamp(1.1rem, 1.8vw, 1.3rem);
    margin-bottom: 0.75rem;
    color: var(--primary-color);
}

.interest-card p {
    font-size: clamp(0.9rem, 1.2vw, 0.95rem);
    line-height: 1.6;
    color: var(--primary-color);
}

/* ========================================
   プロフィール詳細セクション
======================================== */
.profile-detail-section {
    padding: 4rem 2rem;
}

.profile-detail-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0;
}

.profile-detail-image {
    flex-shrink: 0;
    display: none;
}

.profile-detail-image img {
    width: 280px;
    height: 350px;
    object-fit: cover;
    border-radius: 15px;
    box-shadow: 0 5px 20px var(--shadow);
}

.profile-detail-content {
    width: 100%;
}

.profile-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2.5rem;
}

.profile-info-item {
    background: rgba(255, 255, 255, 0.85);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid rgba(255, 220, 100, 0.3);
    backdrop-filter: blur(10px);
}

.profile-info-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(77, 59, 50, 0.15);
    border-color: var(--accent-color);
}

.profile-info-item h3 {
    font-size: clamp(1.1rem, 1.5vw, 1.3rem);
    margin-bottom: 0.75rem;
    color: var(--primary-color);
}

.profile-info-item p {
    font-size: clamp(0.95rem, 1.2vw, 1.05rem);
    color: var(--primary-color);
    font-weight: 500;
}

.research-interests {
    margin-top: 1rem;
    padding: 2.5rem;
    background: rgba(255, 255, 255, 0.75);
    border-radius: 20px;
    border: 2px solid rgba(255, 220, 100, 0.4);
    backdrop-filter: blur(10px);
}

.research-interests h3 {
    font-size: clamp(1.3rem, 1.8vw, 1.5rem);
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    text-align: center;
    font-weight: 700;
}

.research-item {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    transition: all 0.3s ease;
    border-left: 4px solid #f4c430;
    box-shadow: 0 2px 8px rgba(77, 59, 50, 0.1);
    backdrop-filter: blur(5px);
}

.research-item:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 20px rgba(77, 59, 50, 0.12);
    background: rgba(255, 255, 255, 1);
    border-left-color: #e6b800;
}

.research-item:last-child {
    margin-bottom: 0;
}

.research-label {
    font-weight: 700;
    min-width: 110px;
    color: #d4a017;
    font-size: clamp(0.95rem, 1.2vw, 1.05rem);
    flex-shrink: 0;
}

.research-content {
    flex: 1;
    color: var(--primary-color);
    font-size: clamp(0.9rem, 1.1vw, 1rem);
    line-height: 1.7;
}


/* ========================================
   キャリアページ
======================================== */
.container_career {
    position: absolute;
    width: 85%;
    height: 70%;
    background-color: #ffffffac;
    z-index: 1;
    border-radius: 20px;
    padding: 20px;
    box-sizing: border-box;
    overflow: scroll;
    top: 57%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.car {
    max-width: 1000px;
    margin: 1em auto 1em;
    z-index: 2;
    font-size: clamp(0.9rem, 1vw, 1.1rem);
}

.plus_new_line {
    display: flex;
    margin-bottom: 2em;
}

.plus_new_line .date {
    flex-shrink: 0;
    width: 150px;
    font-size: clamp(1.05rem, 1.2vw, 1.15rem);
}

.plus_new_line .text {
    flex-grow: 1;
    font-size: clamp(0.85rem, 0.95vw, 1rem);
}

.plus_new_line .text strong {
    font-size: clamp(1.05rem, 1.2vw, 1.15rem);
}

/* ========================================
   コンタクトページ
======================================== */
.contact-container {
    position: absolute;
    top: 57%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    max-width: 600px;
    background: rgba(255, 255, 255, 0.9);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(77, 59, 50, 0.15);
}

.contact-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.contact-description {
    text-align: center;
    color: var(--accent-color);
    margin-bottom: 2.5rem;
    font-size: clamp(1rem, 1.5vw, 1.1rem);
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
    background: rgba(255, 243, 184, 0.3);
    border-radius: 15px;
    text-decoration: none;
    color: var(--primary-color);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.contact-item:hover {
    background: rgba(255, 243, 184, 0.5);
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(77, 59, 50, 0.1);
}

.contact-item.twitter:hover {
    border-color: #1DA1F2;
}

.contact-item.github:hover {
    border-color: #333;
}

.contact-item.email:hover {
    border-color: var(--accent-color);
}

.contact-icon {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 12px;
    color: var(--primary-color);
}

.contact-item.twitter .contact-icon {
    color: #000000;
}

.contact-item.github .contact-icon {
    color: #333;
}

.contact-item.email .contact-icon {
    color: var(--accent-color);
}

.contact-info {
    flex: 1;
}

.contact-info h3 {
    font-size: clamp(1rem, 1.5vw, 1.1rem);
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--primary-color);
}

.contact-info p {
    font-size: clamp(0.85rem, 1.2vw, 0.95rem);
    color: #666;
    margin: 0;
    word-break: break-all;
}

/* ========================================
   Presentations ページ
======================================== */
.presentations-container {
    position: relative;
    width: 92vw;
    max-width: 100%;
    margin: clamp(5rem, 10vw, 7.5rem) auto clamp(4rem, 8vw, 6rem);
    background: rgba(255, 255, 255, 0.9);
    padding: clamp(1.5rem, 4vw, 3rem);
    border-radius: 1.25rem;
    box-shadow: 0 10px 40px rgba(77, 59, 50, 0.15);
}

.presentations-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.presentations-description {
    text-align: center;
    color: var(--accent-color);
    margin-bottom: 2.5rem;
    font-size: clamp(1rem, 1.5vw, 1.1rem);
}

.presentations-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: clamp(1.1rem, 3vw, 1.6rem);
}

.presentation-card {
    background: rgba(255, 243, 184, 0.3);
    border-radius: 0.9rem;
    padding: clamp(1rem, 3vw, 1.5rem);
    border: 2px solid transparent;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.presentation-card:hover {
    background: rgba(255, 243, 184, 0.5);
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(77, 59, 50, 0.1);
    border-color: var(--accent-color);
}

.presentation-header {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.presentation-title {
    font-size: clamp(1.05rem, 2.8vw, 1.2rem);
    font-weight: 600;
    color: var(--primary-color);
    flex: 1;
}

.presentation-date {
    font-size: clamp(0.85rem, 2.4vw, 0.95rem);
    color: var(--accent-color);
    background: rgba(255, 255, 255, 0.7);
    padding: 0.3rem 0.8rem;
    border-radius: 999px;
    white-space: nowrap;
    align-self: flex-start;
}

.presentation-body {
    flex: 1;
}

.presentation-event {
    font-size: clamp(0.9rem, 2.5vw, 0.98rem);
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.presentation-description {
    font-size: clamp(0.9rem, 2.3vw, 0.98rem);
    color: var(--primary-color);
    line-height: 1.6;
}

.presentation-meta {
    font-size: 0.9rem;
    color: var(--accent-color);
    margin-top: 0.5rem;
}

.presentation-embed-wrapper {
    position: relative;
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
    aspect-ratio: 16 / 9;
    background: rgba(255, 255, 255, 0.85);
    border-radius: 0.75rem;
    overflow: hidden;
    box-shadow: 0 6px 20px rgba(77, 59, 50, 0.08);
}

.presentation-embed-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    border-radius: 0.75rem;
}

.presentation-footer {
    padding-top: 1rem;
    border-top: 1px solid rgba(77, 59, 50, 0.1);
}

.presentation-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.presentation-link:hover {
    color: var(--primary-color);
    gap: 0.7rem;
}

.presentation-link svg {
    transition: transform 0.3s ease;
}

.presentation-link:hover svg {
    transform: translateX(3px);
}

/* ========================================
   レスポンシブデザイン - タブレット
======================================== */
@media screen and (max-width: 1024px) {
    .nav-container {
        padding: 1rem 1.5rem;
    }

    .main nav:not(.fixed-nav) {
        width: 90%;
        margin: 15px auto;
    }

    .main .logo {
        width: 30vw;
    }

    .hero-container {
        gap: 2.5rem;
        padding: 2.5rem;
    }

    .hero-image img {
        width: 250px;
        height: 250px;
    }

}

/* ========================================
   レスポンシブデザイン - スマートフォン
======================================== */
@media screen and (max-width: 768px) {
    /* メイン部分のオーバーフロー設定 */
    .main {
        overflow-y: auto;
        overflow-x: hidden;
    }

    /* ナビゲーション */
    .main nav:not(.fixed-nav) {
        flex-direction: row;
        width: 95%;
        margin: 10px auto;
        position: relative;
    }

    .nav-container {
        padding: 1rem 1.5rem;
    }

    .hamburger {
        display: flex;
        margin-left: auto;
    }

    .nav-links,
    .main .nav-links {
        position: fixed;
        right: -100%;
        top: 0;
        height: 100vh;
        width: 60%;
        max-width: 260px;
        background: rgba(255, 243, 184, 0.95);
        backdrop-filter: blur(10px);
        flex-direction: column;
        transition: right 0.3s ease;
        z-index: 999;
        padding-top: 70px;
        box-shadow: -5px 0 20px var(--shadow);
    }

    .nav-links.active,
    .main .nav-links.active {
        right: 0;
    }

    .nav-links ul,
    .main .nav-links ul {
        flex-direction: column;
        align-items: center;
        gap: 0;
        width: 100%;
    }

    .nav-links li,
    .main .nav-links li {
        width: 100%;
        text-align: center;
        border-bottom: 1px solid rgba(77, 59, 50, 0.1);
        margin-left: 0;
    }

    .nav-links a,
    .main .nav-links a {
        display: block;
        padding: 1.5rem 2rem;
    }

    .main .logo {
        width: 40vw;
        max-width: 150px;
    }

    /* ヒーローセクション */
    .hero-section {
        padding: 2rem 1rem;
    }

    .hero-container {
        flex-direction: column;
        padding: 2rem;
        gap: 2rem;
    }

    .hero-image img {
        width: 200px;
        height: 200px;
    }

    .hero-title {
        text-align: center;
    }

    .hero-subtitle {
        text-align: center;
    }

    .hero-description {
        text-align: center;
    }

    /* 興味・活動 */
    .interests-section {
        padding: 2rem 1rem;
    }

    .interests-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .section-title {
        margin-bottom: 2rem;
    }

    /* 新しいProfileセクション */
    .profile-detail-section {
        padding: 2rem 1rem;
    }

    .profile-detail-container {
        padding: 2rem 1.5rem;
    }

    .profile-detail-image {
        text-align: center;
        display: none;
    }

    .profile-detail-image img {
        width: 100%;
        max-width: 280px;
        height: auto;
    }

    .profile-info-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        margin-bottom: 2rem;
    }

    .profile-info-item {
        padding: 1.5rem;
    }

    .research-interests {
        padding: 1.5rem;
    }

    .research-item {
        flex-direction: column;
        gap: 0.75rem;
        padding: 1.25rem;
    }

    .research-label {
        min-width: auto;
        font-size: clamp(0.95rem, 1.1vw, 1rem);
    }

    .research-content {
        font-size: clamp(0.85rem, 1vw, 0.95rem);
    }

    /* キャリアページ */
    .container_career {
        width: 95%;
        height: auto;
        position: relative;
        top: auto;
        left: auto;
        transform: none;
        margin: 20px auto;
        padding: 15px;
        min-height: 60vh;
    }

    .plus_new_line {
        flex-direction: column;
        margin-bottom: 1.5em;
        align-items: flex-start;
    }

    .plus_new_line .date {
        width: 100%;
        margin-bottom: 4px;
    }

    .plus_new_line .text {
        width: 100%;
    }

    .car {
        margin: 0.5em auto;
    }

    /* コンタクトページ */
    .contact-container {
        width: 90%;
        padding: 2rem;
        top: 50%;
    }

    .contact-links {
        gap: 1.25rem;
    }

    .contact-item {
        padding: 1.25rem;
    }

    .contact-icon {
        width: 45px;
        height: 45px;
    }

    .contact-icon svg {
        width: 28px;
        height: 28px;
    }

    /* Presentationsページ */
    .presentations-container {
        width: 90%;
        padding: 2rem;
        margin-top: 110px;
        margin-bottom: 60px;
    }

    .presentations-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .main.career-page {
        overflow: auto;
    }
}

/* ========================================
   レスポンシブデザイン - 小型スマートフォン
======================================== */
@media screen and (max-width: 480px) {
    .nav-container {
        padding: 0.75rem 1rem;
    }

    .logo {
        height: 40px;
    }

    .main .logo {
        width: 35vw;
        max-width: 120px;
    }

    .main nav:not(.fixed-nav) {
        margin: 5px auto;
    }

    .container {
        padding: 1rem;
    }

    .hero-container {
        padding: 1.5rem;
    }

    .hero-image img {
        width: 180px;
        height: 180px;
    }

    .interest-card {
        padding: 1.5rem;
    }

    .card-icon {
        width: 60px;
        height: 60px;
    }

    .container_career {
        padding: 10px;
    }

    /* Profileセクション - 小型スマホ */
    .profile-detail-container {
        padding: 1.5rem;
    }

    .profile-info-item {
        padding: 1.25rem;
    }

    .research-interests {
        padding: 1.25rem;
    }

    .research-item {
        padding: 1rem;
        gap: 0.5rem;
    }

    /* コンタクトページ */
    .contact-container {
        width: 95%;
        padding: 1.5rem;
    }

    .contact-item {
        flex-direction: column;
        text-align: center;
        padding: 1rem;
        gap: 1rem;
    }

    .contact-icon {
        width: 50px;
        height: 50px;
    }

    /* Presentationsページ */
    .presentations-container {
        width: 95%;
        padding: 1.5rem;
        margin-top: 100px;
        margin-bottom: 50px;
    }

    .presentation-card {
        padding: 1.25rem;
    }
}

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

.hero-container,
.interest-card {
    animation: fadeIn 0.6s ease-out;
}

html {
    scroll-behavior: smooth;
}