/* ===== Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg: #0a0a0f;
    --bg-card: #12121a;
    --bg-card-hover: #1a1a28;
    --text: #e0e0e0;
    --text-muted: #888;
    --accent: #ff4444;
    --accent-glow: rgba(255, 68, 68, 0.3);
    --award: #f0c040;
    --border: #222;
    --radius: 8px;
}

html {
    scroll-behavior: smooth;
    scrollbar-width: none;
}
html::-webkit-scrollbar {
    display: none;
}

body {
    font-family: "Segoe UI", "Noto Sans JP", "Hiragino Sans", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
}

#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: opacity 0.2s;
}
a:hover { opacity: 0.8; }

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

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Navbar ===== */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    max-width: 100%;
    margin: 0;
    padding: 0 40px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
}

.nav-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.nav-logo-icon {
    height: 100%;
    width: auto;
    position: absolute;
    top: 0;
    left: 40px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.nav-links a {
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); opacity: 1; }

.nav-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.lang-toggle {
    background: none;
    border: 1px solid var(--text-muted);
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    padding: 4px 0;
    width: 40px;
    text-align: center;
    border-radius: 4px;
    cursor: pointer;
    font-family: inherit;
    transition: border-color 0.2s, color 0.2s;
}
.lang-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.nav-menu {
    position: relative;
}

.nav-toggle {
    display: flex;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
    padding: 6px;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: background 0.2s;
}
.nav-toggle:hover {
    background: rgba(255, 255, 255, 0.06);
}
.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    transition: transform 0.3s, opacity 0.3s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.nav-dropdown {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    min-width: 240px;
    background: rgba(18, 18, 26, 0.98);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 18px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 0.2s ease, transform 0.2s ease;
    pointer-events: none;
}
.nav-dropdown[hidden] {
    display: none;
}
.nav-dropdown.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.nav-dropdown-section + .nav-dropdown-section {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.nav-dropdown-title {
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    color: var(--accent);
    text-transform: uppercase;
    margin-bottom: 12px;
    font-weight: 600;
}

.nav-option-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 4px 0;
}

.nav-option-label {
    font-size: 0.85rem;
    color: var(--text);
}

.nav-switch {
    position: relative;
    width: 40px;
    height: 22px;
    background: rgba(255, 255, 255, 0.15);
    border: none;
    border-radius: 11px;
    cursor: pointer;
    padding: 0;
    transition: background 0.25s;
    flex-shrink: 0;
}
.nav-switch[aria-checked="true"] {
    background: var(--accent);
    box-shadow: 0 0 8px var(--accent-glow);
}
.nav-switch-knob {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 18px;
    height: 18px;
    background: #fff;
    border-radius: 50%;
    transition: transform 0.25s;
}
.nav-switch[aria-checked="true"] .nav-switch-knob {
    transform: translateX(18px);
}

/* ===== Hero ===== */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: flex-start;
    justify-content: flex-start !important;
    padding-left: 6%;
    padding-top: 20vh;
    padding-right: 0;
    position: relative;
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: left;
}

.hero-sub {
    font-size: 0.9rem;
    letter-spacing: 0.2em;
    color: var(--accent);
    margin-bottom: 16px;
}

.hero-title {
    font-size: 5rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    margin-bottom: 16px;
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 40px;
}

.hero-btn-wrap {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 15vh;
    z-index: 1;
}

.hero-btn {
    display: inline-block;
    padding: 14px 48px;
    border: 1px solid var(--accent);
    color: var(--accent);
    font-size: 0.9rem;
    letter-spacing: 0.15em;
    border-radius: var(--radius);
    transition: background 0.3s, color 0.3s, box-shadow 0.3s;
}
.hero-btn:hover {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 0 30px var(--accent-glow);
    opacity: 1;
}

.hero-bg-text {
    position: absolute;
    font-size: clamp(4rem, 18vw, 14rem);
    font-weight: 900;
    color: rgba(255, 255, 255, 0.02);
    letter-spacing: 0.1em;
    user-select: none;
    white-space: nowrap;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

/* ===== Sections ===== */
section {
    padding: 100px 0;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    margin-bottom: 60px;
    text-align: center;
    position: relative;
}
.section-title::after {
    content: "";
    display: block;
    width: 40px;
    height: 3px;
    background: var(--accent);
    margin: 16px auto 0;
    border-radius: 2px;
}

/* ===== About ===== */
.about-grid {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 48px;
    align-items: start;
}

.photo-placeholder {
    width: 200px;
    height: 260px;
    background: var(--bg-card);
    border: 1px dashed var(--border);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    letter-spacing: 0.1em;
}

.about-text {
    background: rgba(255, 255, 255, 0.04);
    border-radius: 12px;
    padding: 28px 32px;
}

.about-text h3 {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.ruby {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-left: 8px;
}

.about-table {
    margin: 20px 0;
    border-collapse: collapse;
}
.about-table th,
.about-table td {
    padding: 8px 16px 8px 0;
    font-size: 0.9rem;
    text-align: left;
    vertical-align: top;
}
.about-table th {
    color: var(--text-muted);
    white-space: nowrap;
    padding-right: 24px;
}

.about-certs {
    list-style: none;
    margin: 0;
    padding: 0;
}
.about-certs li {
    padding: 2px 0;
}

.about-pr {
    font-size: 0.95rem;
    line-height: 1.9;
    color: var(--text-muted);
}

.about-resume-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 20px;
    padding: 10px 22px;
    border: 1px solid var(--accent);
    border-radius: var(--radius);
    color: var(--accent);
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    transition: background 0.3s, color 0.3s, box-shadow 0.3s;
}
.about-resume-btn:hover {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 0 20px var(--accent-glow);
    opacity: 1;
}
.about-resume-btn svg {
    flex-shrink: 0;
}

/* ===== Skills ===== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.skill-category {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
}

.skill-category h3 {
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    color: var(--accent);
    margin-bottom: 16px;
    text-transform: uppercase;
}

.skill-list {
    list-style: none;
}

.skill-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 0;
    font-size: 0.95rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}
.skill-list li:last-child { border-bottom: none; }

.skill-icon {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    object-fit: contain;
    border-radius: 4px;
}

/* ===== Timeline ===== */
.timeline {
    position: relative;
    display: flex;
    justify-content: space-between;
    margin-bottom: 60px;
    padding: 0 20px;
}

.timeline-line {
    position: absolute;
    top: 18px;
    left: 20px;
    right: 20px;
    height: 4px;
    background: var(--border);
}
.timeline-line::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent));
    opacity: 0.4;
}

.timeline-year {
    position: relative;
    text-align: center;
    flex: 1;
    cursor: pointer;
}

.timeline-year::before {
    content: "";
    display: block;
    width: 12px;
    height: 12px;
    background: var(--accent);
    border-radius: 50%;
    margin: 14px auto 16px;
    box-shadow: 0 0 10px var(--accent-glow);
    position: relative;
    z-index: 1;
}

.timeline-label {
    display: block;
    font-family: "Arial Black", "Helvetica Neue", sans-serif;
    font-size: 1.6rem;
    font-weight: 900;
    color: var(--text);
    letter-spacing: 0.05em;
}

.timeline-sub {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.timeline-tooltip {
    position: absolute;
    bottom: calc(100% + 16px);
    left: 50%;
    transform: translateX(-50%) translateY(8px);
    background: var(--bg-card);
    border: 1px solid var(--accent);
    border-radius: var(--radius);
    padding: 12px 18px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
    pointer-events: none;
    box-shadow: 0 4px 20px var(--accent-glow);
}

/* 吹き出しの三角 */
.timeline-tooltip::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 8px solid transparent;
    border-top-color: var(--accent);
}

.timeline-year:hover .timeline-tooltip,
.timeline-year.tooltip-active .timeline-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

.tooltip-link {
    font-size: 0.8rem;
    color: var(--text);
    transition: color 0.2s;
    display: block;
    padding: 2px 0;
}
.tooltip-link:hover {
    color: var(--accent);
    opacity: 1;
}

/* ===== Works ===== */
.works-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.work-card {
    scroll-margin-top: 80px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
    cursor: pointer;
}
.work-card:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 30px var(--accent-glow);
    transform: translateY(-2px);
}

.work-media {
    position: relative;
    overflow: hidden;
}

.work-year {
    position: absolute;
    top: 8px;
    left: 10px;
    font-family: "Arial Black", "Helvetica Neue", sans-serif;
    font-size: 1.5rem;
    font-weight: 900;
    color: rgba(255, 255, 255, 0.12);
    letter-spacing: 0.05em;
    z-index: 1;
    line-height: 1;
    pointer-events: none;
}

.work-overlay {
    position: absolute;
    inset: 0;
    background: rgba(255, 68, 68, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s;
}
.work-overlay span {
    color: #fff;
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    padding: 8px 20px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 4px;
    backdrop-filter: blur(4px);
}
.work-card:hover .work-overlay {
    opacity: 1;
}

.media-placeholder {
    width: 100%;
    aspect-ratio: 16/9;
    background: #1a1a28;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.8rem;
    letter-spacing: 0.15em;
}

.work-info {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.work-title {
    font-size: 1.15rem;
    font-weight: 700;
}

.work-award {
    display: inline-block;
    width: fit-content;
    background: rgba(240, 192, 64, 0.12);
    color: var(--award);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 4px;
    letter-spacing: 0.05em;
}

.work-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tag {
    background: rgba(255, 68, 68, 0.1);
    color: var(--accent);
    font-size: 0.7rem;
    padding: 3px 10px;
    border-radius: 20px;
    letter-spacing: 0.03em;
}

.work-desc {
    display: none;
}

/* ===== Modal ===== */
.modal {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}
.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(2px);
}

.modal-content {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    max-width: 900px;
    width: 90%;
    max-height: 90vh;
    overflow: auto;
    transform: translateY(30px) scale(0.95);
    transition: transform 0.3s ease;
}
.modal.active .modal-content {
    transform: translateY(0) scale(1);
}

.modal-close {
    position: absolute;
    top: 12px;
    right: 16px;
    background: none;
    border: none;
    color: var(--text);
    font-size: 2rem;
    cursor: pointer;
    z-index: 1;
    line-height: 1;
    transition: color 0.2s;
}
.modal-close:hover { color: var(--accent); }

.modal-body {
    padding: 40px 32px;
    text-align: center;
}
.modal-body video,
.modal-body img {
    max-width: 100%;
    border-radius: 4px;
}

.modal-placeholder {
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: 60px 0;
}

/* ===== Work Detail Modal ===== */
.work-modal-content {
    max-width: 1100px;
    width: 92%;
    max-height: 92vh;
}

.work-detail {
    text-align: left;
}

.work-detail-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    padding-right: 40px;
}

.work-detail-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 24px;
}

.work-detail-left {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.work-detail-video .media-placeholder,
.work-detail-video video,
.work-detail-video iframe,
.work-detail-video img {
    width: 100%;
    aspect-ratio: 16/9;
    border-radius: 4px;
    object-fit: cover;
}
.work-detail-video .media-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #1a1a28;
    border: 1px dashed var(--border);
    color: var(--text-muted);
    font-size: 0.8rem;
    letter-spacing: 0.15em;
}

.work-detail-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.work-detail-section {
    border-top: 1px solid var(--border);
    padding-top: 12px;
}

.work-detail-section-title {
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: 8px;
    text-transform: uppercase;
}

.work-detail-year {
    font-size: 0.9rem;
    color: var(--text);
    margin-bottom: 4px;
}

.work-detail-award {
    font-size: 0.85rem;
    color: var(--award);
    font-weight: 600;
}
.work-detail-award:empty {
    display: none;
}

.work-detail-download-section {
    display: none;
}
.work-detail-download-section.has-link {
    display: block;
}

.work-detail-download {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    border: 1px solid var(--accent);
    border-radius: 4px;
    color: var(--accent);
    font-size: 0.8rem;
    letter-spacing: 0.03em;
    transition: background 0.2s, color 0.2s;
}
.work-detail-download:hover {
    background: var(--accent);
    color: #fff;
    opacity: 1;
}

.work-detail-right {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.work-detail-screenshot .media-placeholder,
.work-detail-screenshot img {
    width: 100%;
    aspect-ratio: 16/9;
    border-radius: 4px;
    object-fit: contain;
    background: #1a1a28;
}
.work-detail-screenshot .media-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #1a1a28;
    border: 1px dashed var(--border);
    color: var(--text-muted);
    font-size: 0.8rem;
    letter-spacing: 0.15em;
}

.work-detail-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.8;
    white-space: pre-line;
}

@media (max-width: 768px) {
    .work-detail-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== Contact ===== */
#contact {
    text-align: center;
}

.contact-content p {
    color: var(--text-muted);
    margin-bottom: 32px;
    min-height: 1.5em;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 24px;
}

.contact-link {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 32px;
    min-width: 180px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 0.9rem;
    background: none;
    cursor: pointer;
    font-family: inherit;
    transition: border-color 0.3s, box-shadow 0.3s;
}
.contact-link:hover {
    border-color: var(--accent);
    box-shadow: 0 0 20px var(--accent-glow);
    opacity: 1;
}
.contact-link svg {
    flex-shrink: 0;
}

/* ===== Footer ===== */
footer {
    text-align: center;
    padding: 32px 0;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* ===== Back to Top ===== */
.back-to-top {
    position: fixed;
    right: 24px;
    bottom: 24px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255, 68, 68, 0.15);
    border: 1px solid var(--border);
    color: var(--accent);
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s, background 0.2s;
    z-index: 90;
}

.back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
}

.back-to-top:hover {
    background: rgba(255, 68, 68, 0.3);
}

/* ===== Email Modal ===== */
.email-modal-content {
    max-width: 500px;
    padding: 40px 36px;
}

.email-modal-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 28px;
    text-align: center;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text);
    font-size: 0.9rem;
    font-family: inherit;
    line-height: 1.6;
    transition: border-color 0.2s;
}
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.form-group textarea {
    resize: vertical;
}

.form-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 28px;
}

.btn-cancel {
    padding: 10px 28px;
    background: none;
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-muted);
    font-size: 0.85rem;
    cursor: pointer;
    font-family: inherit;
    transition: border-color 0.2s, color 0.2s;
}
.btn-cancel:hover {
    border-color: var(--text-muted);
    color: var(--text);
}

.btn-send {
    padding: 10px 28px;
    background: var(--accent);
    border: none;
    border-radius: 4px;
    color: #fff;
    font-size: 0.85rem;
    cursor: pointer;
    font-family: inherit;
    letter-spacing: 0.05em;
    transition: box-shadow 0.3s, opacity 0.2s;
}
.btn-send:hover {
    box-shadow: 0 0 20px var(--accent-glow);
}
.btn-send:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.email-status {
    text-align: center;
    font-size: 0.85rem;
    margin-top: 16px;
}
.email-status.success { color: #4caf50; }
.email-status.error { color: #f44336; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .nav-inner { padding: 0 24px; }
    .nav-logo-icon { left: 24px; }
    .nav-links { gap: 20px; }
    .nav-links a { font-size: 0.78rem; }
}

@media (max-width: 640px) {
    .nav-inner { padding: 0 16px; }
    .nav-logo-icon { left: 16px; }
    .nav-links { gap: 12px; }
    .nav-links a {
        font-size: 0.7rem;
        letter-spacing: 0.03em;
    }
    .nav-right { gap: 10px; }
    .lang-toggle {
        width: 34px;
        font-size: 0.7rem;
    }
}

@media (max-width: 420px) {
    .nav-inner { padding: 0 10px; }
    .nav-logo-icon { left: 10px; }
    .nav-links { gap: 8px; }
    .nav-links a {
        font-size: 0.62rem;
        letter-spacing: 0;
    }
    .nav-dropdown {
        min-width: 220px;
        right: -8px;
    }
}

@media (max-width: 768px) {
    #hero {
        justify-content: center;
        padding-left: 0;
    }
    .hero-title {
        font-size: 2rem;
    }

    .about-grid {
        grid-template-columns: 1fr;
        justify-items: center;
        text-align: center;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .timeline {
        flex-direction: column;
        gap: 0;
        padding: 0;
        align-items: stretch;
        position: relative;
    }
    .timeline-line {
        top: 18px;
        left: 50%;
        right: auto;
        bottom: 18px;
        width: 4px;
        height: auto;
        transform: translateX(-50%);
        display: block;
    }
    .timeline-year {
        display: grid;
        grid-template-columns: calc(50% - 6px) 12px 1fr;
        align-items: center;
        text-align: right;
        padding: 16px 0;
        position: relative;
        width: 100%;
    }
    .timeline-year::before {
        margin: 0;
        grid-column: 2;
        grid-row: 1 / 3;
    }
    .timeline-label {
        font-size: 1.2rem;
        grid-column: 1;
        grid-row: 1;
        padding-right: 12px;
    }
    .timeline-sub {
        display: block;
        margin-left: 0;
        grid-column: 1;
        grid-row: 2;
        padding-right: 12px;
    }
    .timeline-tooltip {
        position: absolute;
        left: calc(50% + 20px);
        margin-left: 0;
        right: auto;
        bottom: auto;
        top: 50%;
        transform: translateY(-50%);
        opacity: 0;
        visibility: hidden;
        background: var(--bg-card);
        border: 1px solid var(--accent);
        border-radius: var(--radius);
        padding: 8px 14px;
        box-shadow: 0 4px 20px var(--accent-glow);
        margin: 0;
    }
    .timeline-tooltip::after {
        top: 50%;
        left: -16px;
        right: auto;
        transform: translateY(-50%);
        border: 8px solid transparent;
        border-right-color: var(--accent);
        border-top-color: transparent;
    }
    .timeline-year:hover .timeline-tooltip,
    .timeline-year.tooltip-active .timeline-tooltip {
        opacity: 1;
        visibility: visible;
        transform: translateY(-50%);
    }

    .works-grid {
        grid-template-columns: 1fr;
    }

    .contact-links {
        flex-direction: column;
        align-items: center;
    }
}

/* ===== Screenshot Carousel ===== */
.work-detail-screenshot {
    position: relative;
}

.screenshot-nav {
    position: absolute;
    top: 0;
    width: 40px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    color: #fff;
    font-size: 1.6rem;
    border: none;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s;
    z-index: 2;
    padding: 0;
    font-family: inherit;
}
.work-detail-screenshot:hover .screenshot-nav {
    opacity: 1;
}
.screenshot-nav.prev { left: 0; border-radius: 4px 0 0 4px; }
.screenshot-nav.next { right: 0; border-radius: 0 4px 4px 0; }
.screenshot-nav:hover { background: rgba(0, 0, 0, 0.7); }

.work-detail-screenshot img {
    cursor: pointer;
    transition: opacity 0.2s;
}
.work-detail-screenshot img:hover {
    opacity: 0.85;
}

/* ===== Lightbox ===== */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 300;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}
.lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
}

.lightbox-container {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 90vw;
    max-height: 90vh;
}

.lightbox-img {
    max-width: 90vw;
    max-height: 85vh;
    object-fit: contain;
    border-radius: 4px;
    position: relative;
    z-index: 1;
}

.lightbox-close {
    position: fixed;
    top: 16px;
    right: 24px;
    background: none;
    border: none;
    color: #fff;
    font-size: 2.5rem;
    cursor: pointer;
    z-index: 2;
    line-height: 1;
    transition: color 0.2s;
}
.lightbox-close:hover { color: var(--accent); }

.lightbox-prev,
.lightbox-next {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 80px;
    background: rgba(0, 0, 0, 0.6);
    color: #fff;
    border: none;
    font-size: 2.2rem;
    cursor: pointer;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
    padding: 0;
}
.lightbox-prev { left: 0; border-radius: 0 4px 4px 0; }
.lightbox-next { right: 0; border-radius: 4px 0 0 4px; }
.lightbox-prev:hover,
.lightbox-next:hover { background: rgba(0, 0, 0, 0.85); }

/* ===== Work Card Screenshot ===== */
.work-media img.work-card-thumb {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: contain;
    background: #1a1a28;
    display: block;
}

/* ===== Animations ===== */
.fade-in {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* カードのstagger（遅延表示） */
.fade-in.stagger-1 { transition-delay: 0.1s; }
.fade-in.stagger-2 { transition-delay: 0.2s; }