* {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        :root {
            --bg-paper: #171717;
            --ink-black: #f3f0e8;
            --ink-gray: #d0ccc2;
            --border-ink: #e7e0d2;
            --surface-paper: #242424;
            --muted-ink: #aaa49a;
            --soft-paper: #303030;
            color-scheme: dark;
        }

        :root[data-theme="light"] {
            --bg-paper: #fcfcfc;
            --ink-black: #000000;
            --ink-gray: #333333;
            --border-ink: #111111;
            --surface-paper: #ffffff;
            --muted-ink: #666666;
            --soft-paper: #f4f4f4;
            color-scheme: light;
        }

        body {
            font-family: 'Noto Serif TC', "Songti TC", "PMingLiU", serif;
            background-color: var(--bg-paper);
            color: var(--ink-black);
            line-height: 1.85;
            letter-spacing: 0.04em;
            padding: 32px 20px;
            width: 100%;
            min-width: 0;
            max-width: 820px;
            margin: 0 auto;
            overflow-wrap: anywhere;
        }

        .intro-screen {
            position: fixed;
            inset: 0;
            z-index: 1000;
            display: grid;
            place-items: center;
            background-color: var(--bg-paper);
            color: var(--ink-black);
            transition: transform 0.75s cubic-bezier(0.76, 0, 0.24, 1), visibility 0.75s;
        }

        .intro-screen.is-done {
            transform: translateY(-100%);
            visibility: hidden;
            pointer-events: none;
        }

        .intro-brand {
            display: inline-block;
            padding-right: 0.16em;
            font-family: 'Cinzel', 'Noto Serif TC', serif;
            font-size: 5rem;
            font-weight: 800;
            line-height: 1;
            letter-spacing: 0.16em;
            border-right: 2px solid currentColor;
            animation: intro-cursor 0.8s steps(1) infinite;
        }

        @keyframes intro-cursor {
            0%, 45% { border-color: currentColor; }
            46%, 100% { border-color: transparent; }
        }

        /* 頂部 Header */
        header {
            display: flex;
            justify-content: space-between;
            align-items: baseline;
            gap: 20px;
            padding-bottom: 15px;
            border-bottom: 2px solid var(--border-ink);
            margin-bottom: 40px;
        }

        .logo {
            font-family: 'Cinzel', 'Noto Serif TC', serif;
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--ink-black);
            letter-spacing: 0.12em;
            text-transform: uppercase;
        }

        nav a {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--ink-gray);
            text-decoration: none;
            margin-left: 20px;
            font-size: 0.9rem;
            font-weight: 600;
            letter-spacing: 0.12em;
            transition: all 0.2s;
        }

        nav a svg,
        .btn-group a svg {
            width: 16px;
            height: 16px;
            fill: none;
            stroke: currentColor;
            stroke-linecap: round;
            stroke-linejoin: round;
            stroke-width: 1.7;
            flex: 0 0 auto;
        }

        nav a:hover {
            color: var(--ink-black);
            border-bottom: 2px solid var(--ink-black);
        }

        .language-toggle {
            flex: 0 0 auto;
            border: 1px solid var(--border-ink);
            background-color: var(--bg-paper);
            color: var(--ink-black);
            padding: 5px 9px;
            font-family: 'Cinzel', 'Noto Serif TC', serif;
            font-size: 0.75rem;
            font-weight: 800;
            letter-spacing: 0.08em;
            cursor: pointer;
            transition: background-color 0.2s, color 0.2s, transform 0.2s;
        }

        .language-toggle:hover,
        .language-toggle:focus-visible {
            background-color: var(--ink-black);
            color: var(--bg-paper);
        }

        .language-toggle:active {
            transform: scale(0.92);
        }

        .theme-toggle {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 30px;
            border: 1px solid var(--border-ink);
            background-color: var(--bg-paper);
            color: var(--ink-black);
            cursor: pointer;
            transition: background-color 0.2s, color 0.2s, transform 0.2s;
        }

        .theme-toggle svg {
            width: 16px;
            height: 16px;
            fill: none;
            stroke: currentColor;
            stroke-linecap: round;
            stroke-linejoin: round;
            stroke-width: 1.8;
        }

        .theme-toggle:hover,
        .theme-toggle:focus-visible {
            background-color: var(--ink-black);
            color: var(--bg-paper);
        }

        .theme-toggle:active {
            transform: scale(0.92);
        }

        /* Hero 主視覺區塊 */
        .hero {
            padding: 10px 0 40px 0;
            border-bottom: 1px dashed var(--border-ink);
            margin-bottom: 40px;
        }

        .hero-subtitle-top {
            font-family: 'Cinzel', serif;
            color: var(--muted-ink);
            font-size: 0.9rem;
            letter-spacing: 0.15em;
            margin-bottom: 12px;
            display: block;
            text-transform: uppercase;
        }

        .hero h1 {
            font-size: 2.1rem;
            font-weight: 900;
            color: var(--ink-black);
            line-height: 1.35;
            margin-bottom: 20px;
            letter-spacing: 0.05em;
        }

        .hero-quote {
            font-size: 1rem;
            color: var(--ink-gray);
            border-left: 3px solid var(--border-ink);
            padding-left: 18px;
            margin-bottom: 30px;
            max-width: 680px;
        }

        .btn-group {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
        }

        .btn-ink {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background-color: var(--ink-black);
            color: var(--bg-paper);
            padding: 10px 24px;
            font-size: 0.85rem;
            text-decoration: none;
            font-weight: 600;
            letter-spacing: 0.12em;
            transition: transform 0.15s, box-shadow 0.15s;
        }

        .btn-ink:hover {
            transform: translate(-2px, -2px);
            box-shadow: 4px 4px 0px var(--border-ink);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            border: 2px solid var(--border-ink);
            color: var(--ink-black);
            padding: 8px 22px;
            font-size: 0.85rem;
            text-decoration: none;
            font-weight: 600;
            letter-spacing: 0.12em;
        }

        /* 連結點擊回饋 */
        a {
            -webkit-tap-highlight-color: transparent;
        }

        .click-pop {
            animation: click-pop 260ms ease-out;
        }

        @keyframes click-pop {
            0% { transform: scale(1); }
            45% { transform: scale(0.94); }
            100% { transform: scale(1); }
        }

        /* 通用章節標題 Section Header */
        .section-header {
            display: flex;
            align-items: center;
            margin: 45px 0 24px 0;
        }

        .section-title {
            font-family: 'Cinzel', 'Noto Serif TC', serif;
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--ink-black);
            letter-spacing: 0.12em;
            text-transform: uppercase;
        }

        .section-divider {
            flex-grow: 1;
            height: 2px;
            background-color: var(--border-ink);
            margin-left: 20px;
        }

        /* 關於我 About Layout */
        .about-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr;
            gap: 30px;
            margin-bottom: 40px;
        }

        .about-text {
            font-size: 0.95rem;
            color: var(--ink-black);
        }

        .certifications {
            margin-top: 24px;
            padding-top: 18px;
            border-top: 1px solid var(--border-ink);
        }

        .certification-list {
            display: grid;
            grid-template-columns: repeat(2, minmax(0, 1fr));
            gap: 8px 20px;
            padding-left: 20px;
            color: var(--ink-gray);
            font-size: 0.9rem;
        }

        .experiences {
            margin-top: 24px;
            padding-top: 18px;
            border-top: 1px solid var(--border-ink);
        }

        .experience-list {
            display: grid;
            gap: 10px;
            padding-left: 20px;
            color: var(--ink-gray);
            font-size: 0.9rem;
        }

        .experience-list strong {
            color: var(--ink-black);
        }

        .about-sidebar {
            padding-left: 20px;
            border-left: 1px solid var(--border-ink);
        }

        .profile-photo {
            display: block;
            width: 100%;
            max-width: 220px;
            aspect-ratio: 1;
            object-fit: cover;
            margin-bottom: 18px;
            border: 2px solid var(--border-ink);
        }

        .sidebar-title {
            font-family: 'Cinzel', serif;
            font-size: 0.8rem;
            color: var(--muted-ink);
            letter-spacing: 0.15em;
            display: block;
            margin-bottom: 12px;
        }

        .tag-item {
            display: inline-block;
            background-color: var(--ink-black);
            color: var(--bg-paper);
            padding: 3px 10px;
            margin: 0 6px 8px 0;
            font-size: 0.8rem;
            letter-spacing: 0.08em;
            font-family: 'Cinzel', 'Noto Serif TC', serif;
        }

        /* 專案卡片 Projects Layout */
        .projects-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 40px;
        }

        .project-card {
            background-color: var(--surface-paper);
            border: 2px solid var(--border-ink);
            padding: 24px;
            box-shadow: 5px 5px 0px var(--border-ink); /* 拓印感硬陰影 */
        }

        .project-num {
            font-family: 'Cinzel', serif;
            color: var(--muted-ink);
            font-size: 0.8rem;
            margin-bottom: 8px;
            display: block;
            letter-spacing: 0.1em;
        }

        .project-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--ink-black);
            margin-bottom: 10px;
            border-bottom: 1px solid var(--border-ink);
            padding-bottom: 6px;
        }

        .project-link {
            display: inline-block;
            position: relative;
            color: inherit;
            text-decoration: none;
            transition: color 0.2s ease, transform 0.2s ease;
        }

        .project-link::after {
            content: '↗';
            display: inline-block;
            margin-left: 8px;
            opacity: 0;
            transform: translate(-5px, 5px);
            transition: opacity 0.2s ease, transform 0.2s ease;
        }

        .project-link:hover,
        .project-link:focus-visible {
            color: var(--muted-ink);
            transform: translateX(5px);
        }

        .project-link:hover::after,
        .project-link:focus-visible::after {
            opacity: 1;
            transform: translate(0, 0);
        }

        .project-link:active {
            transform: translateX(5px) scale(0.94);
        }

        @media (prefers-reduced-motion: reduce) {
            .project-link,
            .project-link::after,
            .click-pop {
                animation: none;
                transition: none;
            }
        }

        .project-card p {
            color: var(--ink-gray);
            font-size: 0.9rem;
            margin-bottom: 18px;
            line-height: 1.75;
        }

        /* 生活札記 */
        .world-hero {
            padding: 10px 0 34px;
            border-bottom: 1px dashed var(--border-ink);
            margin-bottom: 40px;
        }

        .world-meta {
            display: flex;
            justify-content: space-between;
            gap: 20px;
            color: var(--muted-ink);
            font-family: 'Cinzel', serif;
            font-size: 0.78rem;
            letter-spacing: 0.1em;
        }

        .photo-grid {
            display: grid;
            grid-template-columns: 1.35fr 1fr;
            gap: 20px;
            margin-bottom: 44px;
        }

        .photo-frame,
        .photo-placeholder {
            margin: 0;
            border: 2px solid var(--border-ink);
            background-color: var(--surface-paper);
        }

        .photo-frame-large {
            grid-row: span 2;
        }

        .photo-frame img {
            display: block;
            width: 100%;
            height: 100%;
            min-height: 360px;
            object-fit: cover;
        }

        .photo-frame figcaption {
            display: flex;
            justify-content: space-between;
            gap: 12px;
            padding: 10px 12px;
            border-top: 1px solid var(--border-ink);
            font-size: 0.85rem;
        }

        .photo-frame figcaption span,
        .photo-placeholder span {
            color: var(--muted-ink);
            font-family: 'Cinzel', serif;
            font-size: 0.72rem;
            letter-spacing: 0.1em;
        }

        .photo-placeholder {
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            min-height: 170px;
            padding: 14px;
            background: repeating-linear-gradient(-45deg, var(--surface-paper), var(--surface-paper) 8px, var(--soft-paper) 8px, var(--soft-paper) 9px);
        }

        .photo-placeholder strong {
            font-size: 0.95rem;
            font-weight: 600;
        }

        .reflection {
            max-width: 680px;
            margin: 0 auto;
        }

        .reflection p {
            color: var(--ink-gray);
            font-size: 0.98rem;
            line-height: 2;
            margin-bottom: 18px;
        }

        .reflection .reflection-lead {
            color: var(--ink-black);
            font-size: 1.1rem;
            font-weight: 600;
        }

        .world-back {
            display: flex;
            justify-content: center;
            margin-top: 38px;
        }

        /* 專案介紹頁 */
        .project-hero {
            padding: 10px 0 34px;
            border-bottom: 1px dashed var(--border-ink);
            margin-bottom: 40px;
        }

        .project-hero h1 {
            font-size: 2.5rem;
            font-weight: 900;
            line-height: 1.35;
            margin-bottom: 20px;
        }

        .project-meta {
            display: flex;
            justify-content: space-between;
            gap: 20px;
            color: var(--muted-ink);
            font-family: 'Cinzel', serif;
            font-size: 0.78rem;
            letter-spacing: 0.1em;
        }

        .project-summary {
            max-width: 680px;
            margin: 0 auto 44px;
        }

        .project-summary p {
            color: var(--ink-gray);
            font-size: 0.98rem;
            line-height: 2;
            margin-bottom: 18px;
        }

        .project-summary .project-summary-lead {
            color: var(--ink-black);
            font-size: 1.1rem;
            font-weight: 600;
        }

        .project-points {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-bottom: 32px;
        }

        .project-points > div {
            border-top: 2px solid var(--border-ink);
            padding-top: 16px;
        }

        .project-points h3 {
            font-size: 1rem;
            margin: 4px 0 8px;
        }

        .project-points p {
            color: var(--ink-gray);
            font-size: 0.88rem;
            line-height: 1.75;
        }

        .project-tags {
            border-top: 1px solid var(--border-ink);
            padding-top: 18px;
        }

        /* 程式解題頁 */
        .coding-hero {
            padding: 10px 0 34px;
            border-bottom: 1px dashed var(--border-ink);
            margin-bottom: 40px;
        }

        .coding-hero h1 {
            font-size: 2.5rem;
            font-weight: 900;
            line-height: 1.35;
            margin-bottom: 20px;
        }

        .problem-meta {
            display: flex;
            justify-content: space-between;
            gap: 20px;
            color: var(--muted-ink);
            font-family: 'Cinzel', serif;
            font-size: 0.78rem;
            letter-spacing: 0.1em;
        }

        .problem-box,
        .io-box {
            border: 2px solid var(--border-ink);
            background-color: var(--surface-paper);
            padding: 22px;
        }

        .problem-box {
            margin-bottom: 20px;
        }

        .problem-label {
            display: block;
            color: var(--muted-ink);
            font-family: 'Cinzel', serif;
            font-size: 0.75rem;
            letter-spacing: 0.1em;
            margin-bottom: 8px;
        }

        .problem-box h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
        }

        .problem-box p,
        .io-box p {
            color: var(--ink-gray);
            font-size: 0.9rem;
            line-height: 1.8;
        }

        .io-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        .solution-steps {
            display: grid;
            gap: 18px;
            margin-bottom: 44px;
        }

        .solution-steps > div {
            display: grid;
            grid-template-columns: 42px 1fr;
            gap: 14px;
            border-bottom: 1px solid var(--muted-ink);
            padding-bottom: 16px;
        }

        .step-number {
            color: var(--muted-ink);
            font-family: 'Cinzel', serif;
            font-size: 0.85rem;
        }

        .solution-steps h3 {
            font-size: 1rem;
            margin-bottom: 4px;
        }

        .solution-steps p {
            color: var(--ink-gray);
            font-size: 0.9rem;
        }

        .code-panel {
            overflow: hidden;
            border: 2px solid var(--border-ink);
            background-color: #171717;
            color: #f5f5f5;
            margin-bottom: 24px;
        }

        .code-panel-header {
            display: flex;
            justify-content: space-between;
            padding: 10px 16px;
            border-bottom: 1px solid var(--muted-ink);
            color: var(--ink-gray);
            font-family: 'Cinzel', serif;
            font-size: 0.75rem;
            letter-spacing: 0.08em;
        }

        .code-panel pre {
            overflow-x: auto;
            padding: 20px;
            line-height: 1.7;
        }

        .code-panel code {
            font-family: 'SFMono-Regular', Consolas, monospace;
            font-size: 0.85rem;
        }

        .problem-tags {
            border-top: 1px solid var(--border-ink);
            padding-top: 18px;
        }

        .problem-directory {
            border-top: 2px solid var(--border-ink);
            margin-bottom: 38px;
        }

        .directory-row {
            display: grid;
            grid-template-columns: 56px minmax(150px, 1.6fr) 1fr 1fr;
            align-items: center;
            gap: 16px;
            min-height: 58px;
            padding: 10px 8px;
            border-bottom: 1px solid var(--muted-ink);
            color: var(--ink-gray);
            font-size: 0.9rem;
        }

        .directory-row strong {
            color: var(--ink-black);
            font-weight: 600;
        }

        .directory-heading {
            min-height: 42px;
            color: var(--muted-ink);
            font-family: 'Cinzel', serif;
            font-size: 0.72rem;
            letter-spacing: 0.1em;
        }

        .directory-status {
            color: var(--muted-ink);
            font-family: 'Cinzel', serif;
            font-size: 0.7rem;
            letter-spacing: 0.06em;
        }

        /* 聯絡資訊 Contact */
        .contact-box {
            border: 2px solid var(--border-ink);
            background-color: var(--surface-paper);
            padding: 35px 20px;
            text-align: center;
            box-shadow: 6px 6px 0px var(--border-ink);
        }

        .contact-box h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .contact-box p {
            color: var(--ink-gray);
            font-size: 0.9rem;
            margin-bottom: 22px;
        }

        .social-links {
            display: flex;
            justify-content: center;
            gap: 14px;
            margin-top: 24px;
        }

        .social-link {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            color: var(--ink-black);
            border: 1px solid var(--border-ink);
            transition: background-color 0.2s, color 0.2s, transform 0.2s;
        }

        .social-link:hover {
            background-color: var(--ink-black);
            color: var(--bg-paper);
            transform: translateY(-2px);
        }

        .social-link svg {
            width: 22px;
            height: 22px;
            fill: currentColor;
        }

        .social-link svg rect,
        .social-link svg circle:not(.social-dot) {
            fill: none;
            stroke: currentColor;
            stroke-width: 1.8;
        }

        .social-link svg .social-dot {
            fill: currentColor;
        }

        /* 頁尾 Footer */
        footer {
            margin-top: 50px;
            border-top: 2px solid var(--border-ink);
            padding-top: 25px;
            text-align: center;
            color: var(--ink-gray);
            font-size: 0.8rem;
            letter-spacing: 0.15em;
            font-family: 'Cinzel', serif;
            text-transform: uppercase;
        }

        /* RWD 響應式微調 */
        @media (max-width: 650px) {
            body {
                padding: 24px 16px;
            }

            header {
                align-items: flex-start;
                flex-direction: column;
                gap: 12px;
                margin-bottom: 30px;
            }

            nav {
                display: flex;
                flex-wrap: wrap;
                gap: 8px 18px;
            }

            nav a {
                margin-left: 0;
            }

            .hero {
                padding-bottom: 30px;
                margin-bottom: 30px;
            }

            .intro-brand {
                font-size: 3rem;
            }

            .hero h1 {
                font-size: 1.75rem;
            }

            .hero-quote {
                padding-left: 12px;
                margin-bottom: 24px;
            }

            .btn-group {
                display: grid;
                grid-template-columns: repeat(2, minmax(0, 1fr));
                gap: 10px;
            }

            .btn-ink,
            .btn-outline {
                min-height: 44px;
                padding: 9px 12px;
                text-align: center;
            }

            .section-header {
                align-items: flex-start;
                gap: 12px;
                margin-top: 36px;
            }

            .section-divider {
                margin-left: 0;
                margin-top: 0.8em;
            }

            .about-grid, .projects-grid {
                grid-template-columns: 1fr;
            }

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

            .photo-frame-large {
                grid-row: auto;
            }

            .photo-frame img {
                min-height: 260px;
            }

            .world-meta {
                align-items: flex-start;
                flex-direction: column;
                gap: 4px;
            }

            .project-hero h1 {
                font-size: 2rem;
            }

            .project-meta {
                align-items: flex-start;
                flex-direction: column;
                gap: 4px;
            }

            .coding-hero h1 {
                font-size: 2rem;
            }

            .problem-meta {
                align-items: flex-start;
                flex-direction: column;
                gap: 4px;
            }

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

            .directory-row {
                grid-template-columns: 36px 1fr;
                gap: 4px 12px;
                padding: 12px 6px;
            }

            .directory-row > :nth-child(3),
            .directory-row > :nth-child(4) {
                grid-column: 2;
            }

            .directory-heading {
                display: none;
            }

            .project-points {
                grid-template-columns: 1fr;
            }

            .about-sidebar {
                padding-left: 0;
                border-left: none;
                border-top: 1px solid var(--border-ink);
                padding-top: 20px;
            }

            .profile-photo {
                max-width: 180px;
            }

            .project-card {
                padding: 18px;
                box-shadow: 4px 4px 0px var(--border-ink);
            }

            .contact-box {
                padding: 28px 16px;
                box-shadow: 4px 4px 0px var(--border-ink);
            }

            footer {
                margin-top: 38px;
                padding-top: 20px;
                line-height: 1.6;
            }
        }

        @media (max-width: 420px) {
            body {
                padding: 20px 12px;
            }

            .logo {
                font-size: 1.15rem;
            }

            .hero h1 {
                font-size: 1.5rem;
            }

            .hero-subtitle-top,
            .project-num,
            .sidebar-title {
                letter-spacing: 0.08em;
            }

            .btn-group {
                grid-template-columns: 1fr;
            }

            .section-title {
                font-size: 1.05rem;
            }

            .certification-list {
                grid-template-columns: 1fr;
            }

            .project-card h3 {
                font-size: 1rem;
            }

            .contact-box h3 {
                font-size: 1rem;
            }
        }