/* ==========================================================================
   ✨ Global Variables & Futuristic Baseline Styles
   ========================================================================== */
:root {
    --black: #080a0f;
    --white: #f0f4f8;
    --cream: #e0e8f0;
    --accent: #00d2ff;
    --accent-dark: #00a8cc;
    --text-muted: #8892b0;
    --card-bg: #111520;
    --border: rgba(0, 210, 255, 0.15);
    --nav-height: 72px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--black);
    color: var(--white);
    font-family: 'Inter', 'Noto Sans SC', sans-serif;
    font-weight: 300;
    overflow-x: hidden;
}

/* Navigation Baseline */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 4vw;
    background: rgba(8, 10, 15, 0.85);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    transition: all 0.3s;
}

.nav-logo {
    font-family: 'Syne', sans-serif;
    font-weight: 800;
    display: flex;
    align-items: center;
    text-decoration: none;
    cursor: pointer;
}

.nav-links {
    display: flex;
    gap: 4.5rem;
    list-style: none;
}

.nav-links a {
    color: var(--white);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 400;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    opacity: 0.75;
    transition: opacity 0.2s, color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    opacity: 1;
    color: var(--accent);
}

/* Language Switcher UI Baseline */
.lang-switcher {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.lang-switcher a {
    color: var(--text-muted);
    font-size: 0.75rem;
    text-decoration: none;
    transition: 0.3s;
}

.lang-switcher a:hover {
    color: var(--accent);
}

/* Main Content Padding */
main {
    min-height: 100vh;
    padding-top: var(--nav-height);
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(16px);
    }

    to {
        opacity: 1;
        transform: none;
    }
}


/* ==========================================================================
   ✨ Hero Section Layout & Anti-Overflow Desktop Baselines
   ========================================================================== */
.hero {
    min-height: calc(100vh - var(--nav-height));
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    padding: 0 4vw;
    gap: 4rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 60% 80% at 70% 50%, rgba(0, 210, 255, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

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

.hero-eyebrow {
    display: inline-block;
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
    border: 1px solid var(--border);
    padding: 6px 16px;
    border-radius: 2px;
    margin-bottom: 2rem;
}

/* Desktop Fix: Adaptive Fluid Font scaling */
.hero h1 { 
    font-family: 'Syne', sans-serif; 
    font-size: clamp(2.5rem, 4vw, 3.8rem) !important; 
    font-weight: 800; 
    line-height: 1.1 !important; 
    margin-bottom: 1.5rem; 
    letter-spacing: -0.02em; 
}

.hero h1 em {
    font-style: italic;
    color: var(--accent);
}

.section-title, .page-header h1 { 
    font-family: 'Syne', sans-serif; 
    font-weight: 700; 
    font-size: 2.2rem; 
}

.hero-desc {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-muted);
    max-width: 480px;
    margin-bottom: 2.5rem;
}

.hero-img-right h3 {
    font-family: 'Syne', sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 0.5rem;
    color: var(--white);
}

/* Desktop Fix: Globally force flexibility wrapper */
.btn-group {
    display: flex;
    gap: 1.2rem;
    flex-wrap: wrap;
}

.btn-primary, .btn-outline {
    padding: 14px 32px;
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    cursor: pointer;
    border-radius: 2px;
    transition: 0.2s;
    text-decoration: none;
}

.btn-primary { background: var(--accent); color: var(--black); border: none; }
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-2px); }

.btn-outline { background: transparent; color: var(--white); border: 1px solid rgba(240, 244, 248, 0.25); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

/* ==========================================================================
   ✨ Hero Visual Element (Thick Border & Desktop Badge Overlaps)
   ========================================================================== */
.hero-visual {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 520px;
}

.hero-img-frame {
    width: 400px;
    height: 400px;
    background: var(--card-bg);
    border: 4px solid rgba(0, 210, 255, 0.4);
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6), 0 0 20px rgba(0, 210, 255, 0.1);
    position: relative;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-img-frame img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.float-badge {
    position: absolute;
    background: rgba(17, 21, 32, 0.85);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(0, 210, 255, 0.3);
    border-radius: 4px;
    padding: 8px 16px;
    font-size: 0.75rem;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 8px;
    z-index: 10;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
}

.float-badge .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 8px var(--accent);
}

.float-badge.top-left { top: 120px; right: calc(50% + 150px); }
.float-badge.top-right { top: 50px; left: calc(50% + 120px); }
.float-badge.bottom-left { bottom: 90px; right: calc(50% + 120px); }
.float-badge.bottom-right { bottom: 140px; left: calc(50% + 150px); }

.hero-grid-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    background-image: linear-gradient(rgba(0, 210, 255, 0.04) 1px, transparent 1px), linear-gradient(90deg, rgba(0, 210, 255, 0.04) 1px, transparent 1px);
    background-size: 40px 40px;
}


/* ==========================================================================
   ✨ Static Document Component Baselines (Desktop view grids)
   ========================================================================== */
.software-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: center;
    padding: 4rem 4vw;
    border-top: 1px solid var(--border);
}

.software-grid img { height: 40px; opacity: 0.6; transition: opacity 0.3s, transform 0.3s; }
.software-grid img:hover { opacity: 1; transform: translateY(-3px); }

.skills-section { padding: 4rem 4vw 6rem; }
.section-header { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 3rem; }
.section-title { font-size: 2.2rem; }

.section-link {
    font-size: 0.8rem;
    color: var(--accent);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    text-decoration: none;
    transition: color 0.2s ease, transform 0.3s ease;
    display: inline-block;
}
.section-link:hover { color: var(--white); transform: translateX(4px); }

.skills-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; border: 1px solid var(--border); }
.skill-card {
    padding: 2.5rem 2rem;
    background: var(--card-bg);
    transition: background 0.25s;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}
.skill-card::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0;
    height: 2px; width: 0;
    background: var(--accent);
    transition: width 0.35s ease;
}
.skill-card:hover { background: #181d2c; }
.skill-card:hover::after { width: 100%; }

.skill-icon {
    font-size: 1.8rem; margin-bottom: 1rem;
    width: 48px; height: 48px;
    display: flex; align-items: center; justify-content: center;
    background: rgba(0, 210, 255, 0.08); border-radius: 4px; color: var(--accent);
}
.skill-card h4 { font-size: 1rem; font-weight: 500; margin-bottom: 0.5rem; }
.skill-card p { font-size: 0.82rem; color: var(--text-muted); line-height: 1.6; }

/* --- Headers & Inner Page Elements Baseline --- */
.page-header { padding: 4rem 4vw 2rem; }
.page-header h1 { font-size: 2.8rem; }
.page-header p {
    color: var(--text-muted);
    margin-top: 0.75rem;
    font-size: 1rem;
    line-height: 1.8;
    max-width: 600px;
}

.filter-bar { display: flex; gap: 0.6rem; flex-wrap: wrap; padding: 0 4vw 2.5rem; }
.filter-btn {
    background: transparent; border: 1px solid var(--border); color: var(--text-muted);
    padding: 10px 22px; font-family: 'Inter', sans-serif; font-size: 0.75rem;
    letter-spacing: 0.08em; text-transform: uppercase; cursor: pointer;
    border-radius: 2px; transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}
.filter-btn:hover { border-color: rgba(0, 210, 255, 0.5); color: var(--white); }
.filter-btn.active {
    border-color: var(--accent); color: var(--accent);
    background: rgba(0, 210, 255, 0.08); box-shadow: 0 0 15px rgba(0, 210, 255, 0.1);
}

/* ==========================================================================
   ✨ Portfolio Layout Baseline (Desktop)
   ========================================================================== */
.portfolio-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
    background: var(--border); margin: 0 4vw 4rem 4vw; 
    border: 1px solid var(--border); border-radius: 6px; overflow: hidden; 
}

.portfolio-item {
    background: var(--card-bg); cursor: pointer; position: relative;
    overflow: hidden; aspect-ratio: 1; display: flex; align-items: flex-end;
}
.portfolio-item.bento-large { grid-column: span 2; aspect-ratio: auto; min-height: 380px; }

.portfolio-bg { position: absolute; inset: 0; z-index: 0; }

.portfolio-overlay {
    position: absolute; inset: 0;
    background: linear-gradient(transparent 30%, rgba(8, 10, 15, 0.95) 100%);
    opacity: 0; transition: opacity 0.3s; z-index: 1;
}

.portfolio-info {
    position: absolute; bottom: 0; left: 0; right: 0; padding: 2rem;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.85));
    opacity: 0; transition: 0.3s; z-index: 2; 
}

.portfolio-item:hover .portfolio-overlay { opacity: 1; }
.portfolio-item:hover .portfolio-info { opacity: 1; }
.portfolio-info h3 { font-family: 'Syne', sans-serif; font-size: 1.3rem; font-weight: 700; }
.portfolio-info span { font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); display: block; margin-bottom: 6px; }

.portfolio-art { display: none; }

.portfolio-img {
    width: 100%; height: 100%; object-fit: cover !important; 
    object-position: center !important; display: block; transition: transform 0.6s ease;
}
.portfolio-item:hover .portfolio-img { transform: scale(1.05); }

/* Background Gradients Patterns */
.pat-code { background: linear-gradient(135deg, #0a1128 0%, #101830 100%); }
.pat-video { background: linear-gradient(135deg, #081015 0%, #102028 100%); }
.pat-uiux { background: linear-gradient(135deg, #0a1520 0%, #102840 100%); }

/* ==========================================================================
   ✨ Modal Core Styles
   ========================================================================== */
.modal-overlay {
    display: none; position: fixed; inset: 0; z-index: 200;
    background: rgba(0, 0, 0, 0.85); align-items: center; justify-content: center;
    padding: 2rem; backdrop-filter: blur(5px);
}
.modal-overlay.open { display: flex; }

.modal-close {
    position: absolute; top: 1rem; right: 1.25rem; background: none; border: none;
    color: var(--text-muted); font-size: 1.5rem; cursor: pointer; transition: color 0.2s; z-index: 100;
}
.modal-close:hover { color: var(--white); }

/* ==========================================================================
   ✨ DESKTOP MODAL OPTIMIZATION (Prevent Scrollbars & Fix Image Sizing) ✨
   ========================================================================== */
.modal {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px !important;
    max-width: 1100px !important;
    width: 92% !important;
    max-height: 88vh !important; /* 强制封顶，杜绝外部滚动条喵！ */
    padding: 3rem !important;
    position: relative;
    animation: fadeIn 0.3s;
    overflow: hidden !important; 
    display: flex !important;
    flex-direction: column !important;
}

/* 内部弹性盒子并排排列 */
.modal > div:not(.modal-close) {
    display: flex !important;
    align-items: center !important;
    flex-wrap: nowrap !important; /* 强行在桌面端左右排布 */
    height: 100% !important;
    min-height: 0 !important; 
}

/* 左侧媒体区 (占 60% 宽度) */
.modal > div:not(.modal-close) > div:nth-child(1) {
    flex: 1 1 60% !important;
    height: 100% !important;
    min-height: 0 !important;
    display: flex !important;
    flex-direction: column !important;
    justify-content: center !important;
    align-items: center !important;
}

/* 强迫图片乖乖缩放，绝不撑爆屏幕喵！ */
.modal .portfolio-img {
    max-height: 72vh !important;
    max-width: 100% !important;
    width: auto !important;
    height: auto !important;
    object-fit: contain !important; /* 保持原比例完整显示喵 */
    border-radius: 8px !important;
    display: block !important;
    margin: 0 auto !important;
}

/* 基础 iframe 设定（默认分配 16:9 比例，适合 YouTube 等视频媒体） */
.modal iframe {
    width: 100% !important;
    height: auto !important;
    aspect-ratio: 16 / 9 !important; /* 给 YouTube 留足空间 */
    max-height: 72vh !important;
    border-radius: 8px !important;
    display: block !important;
    margin: 0 auto !important;
}

/* 💖 终极狙击魔法：专门捕获 Figma Embed，强制锁定 1:1 正方形！ */
.modal iframe[src*="figma"], 
.modal iframe[src*="Figma"] {
    aspect-ratio: 1 / 1 !important;
    max-width: 72vh !important; /* 限制宽屏下的最大宽度，防止它胖出天际超出高度限制喵 */
}

.modal > div:not(.modal-close) > div:nth-child(1) > div:first-child {
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    width: 100% !important;
    height: 100% !important;
}

/* 桌面端画廊计数器美化 */
#gallery-counter {
    margin-top: 15px !important;
    background: rgba(0, 210, 255, 0.1) !important;
    border: 1px solid rgba(0, 210, 255, 0.3) !important;
    color: var(--accent) !important;
    padding: 6px 20px !important;
    border-radius: 20px !important;
    font-size: 0.8rem !important;
    letter-spacing: 2px !important;
    z-index: 5;
}

/* 右侧文本区 (占 40% 宽度) */
.modal > div:not(.modal-close) > div:nth-child(2) {
    flex: 1 1 40% !important;
    max-height: 75vh !important;
    overflow-y: auto !important; /* 万一文字太长，单独让文字产生细滚动条 */
    padding-right: 15px !important;
    display: flex !important;
    flex-direction: column !important;
    justify-content: center !important;
}

/* 为右侧文字专门定做的隐形滚动条喵 */
.modal > div:not(.modal-close) > div:nth-child(2)::-webkit-scrollbar { width: 4px; }
.modal > div:not(.modal-close) > div:nth-child(2)::-webkit-scrollbar-thumb {
    background: rgba(0, 210, 255, 0.3); border-radius: 10px;
}


/* ==========================================================================
   ✨ Social & Contact Grids
   ========================================================================== */
.social-platforms { padding: 2rem 4vw; display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.platform-card {
    background: var(--card-bg); border: 1px solid var(--border); border-radius: 4px;
    padding: 2rem; position: relative; transition: transform 0.2s; text-decoration: none;
    color: var(--white); display: block;
}
.platform-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.platform-header { display: flex; align-items: center; gap: 1rem; margin-bottom: 1rem; }
.platform-icon {
    width: 48px; height: 48px; border-radius: 50%; display: flex; align-items: center;
    justify-content: center; font-size: 1.4rem; background: rgba(0, 210, 255, 0.1); color: var(--accent);
}

.contact-wrapper { padding: 2rem 4vw 4rem; display: grid; grid-template-columns: 1fr 1fr; gap: 6rem; align-items: start; }
.contact-item { display: flex; align-items: flex-start; gap: 1rem; margin-bottom: 1.5rem; }
.contact-item-icon {
    width: 40px; height: 40px; background: rgba(0, 210, 255, 0.1); border: 1px solid var(--border);
    border-radius: 4px; display: flex; align-items: center; justify-content: center; color: var(--accent);
}
.contact-item-text label { font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-muted); display: block; margin-bottom: 4px; }

footer { border-top: 1px solid var(--border); padding: 3rem 4vw; display: flex; align-items: center; justify-content: space-between; }
footer p { font-size: 0.8rem; color: var(--text-muted); }

/* Mobile Menu Toggle Default Hide */
.menu-toggle { display: none; }


/* ==========================================================================
   ✨ FULL MOBILE RESPONSIVE OPTIMIZATION (max-width 900px)
   ========================================================================== */
@media (max-width: 900px) {
    
    /* --- Global Mobile Safety Net to Lock Viewports --- */
    html, body, main, section, #portfolio, .portfolio-grid {
        max-width: 100% !important;
        overflow-x: hidden !important;
        box-sizing: border-box !important;
    }

    /* --- Tech Glassmorphism Floating Menu Ball --- */
    .menu-toggle {
        display: flex !important; justify-content: center; align-items: center;
        position: absolute !important; 
        top: 13px !important; right: 4vw !important; 
        width: 46px !important; height: 46px !important;
        color: #ffffff; cursor: pointer; border-radius: 50%; font-size: 1.5rem; 
        z-index: 10000 !important; 
        background: rgba(15, 15, 15, 0.6); backdrop-filter: blur(12px);
        border: 1px solid rgba(0, 238, 255, 0.25); box-shadow: 0 4px 15px rgba(0, 238, 255, 0.2);
        transition: all 0.3s ease;
    }
    .menu-toggle:hover { transform: scale(1.08) !important; border-color: rgba(0, 238, 255, 0.6) !important; }

    #main-nav { display: flex; justify-content: flex-start; align-items: center; gap: 2rem; padding: 1.2rem 1.5rem; background: transparent; }
    .lang-switcher { margin-left: 0; margin-right: 0; }

    .nav-links {
        position: fixed; top: 0; right: -100%; width: 75%; height: 100vh;
        display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 2.5rem;
        z-index: 9998; transition: right 0.4s cubic-bezier(0.77, 0, 0.175, 1);
        background: rgba(10, 10, 10, 0.88); backdrop-filter: blur(20px); border-left: 1px solid rgba(255, 255, 255, 0.05);
    }
    #main-nav.nav-active .nav-links { right: 0; }
    .nav-links li a { font-size: 1.35rem; letter-spacing: 0.12em; }

    /* --- Mobile Layout Stacking & Hero Typography Overflow Fix --- */
    .hero { grid-template-columns: 1fr; padding: 2rem 4vw; overflow-x: hidden; }
    .hero h1 { font-size: 2.2rem !important; line-height: 1.15 !important; letter-spacing: -0.01em !important; word-break: break-word !important; }
    .hero-desc { font-size: 0.95rem !important; line-height: 1.6 !important; }
    .btn-group { width: 100% !important; }
    .btn-group a { flex: 1 1 160px !important; text-align: center; font-size: 0.85rem !important; }

    /* --- HERO VISUAL BUBBLE FIX (Prevents overflowing off-screen) --- */
    .hero-visual {
        display: flex !important; justify-content: center; align-items: center;
        position: relative; width: 100%; height: auto !important; margin: 3rem 0 2rem 0 !important;
    }
    .hero-img-frame { width: 220px !important; height: 220px !important; }

    /* 🛡️ 标签位置精细修复：激活左右相对锚点 */
    .float-badge { 
        font-size: 0.65rem !important; padding: 6px 10px !important; 
        white-space: nowrap !important; z-index: 20 !important;
    }
    .float-badge.top-left { top: 10% !important; left: 0 !important; right: auto !important; }
    .float-badge.bottom-left { bottom: 10% !important; left: 0 !important; right: auto !important; }
    .float-badge.top-right { top: 5% !important; right: 0 !important; left: auto !important; }
    /* 🌟 THE FIX: 把 bottom-right 的 right 设为 -4vw，把它用力往右边推开！ */
    .float-badge.bottom-right { bottom: 5% !important; right: 5vw !important; left: auto !important; }

    /* --- 🛠️ MOBILE FILTER BAR HORIZONTAL APP-STYLE SWIPE --- */
    .filter-bar {
        display: flex !important;
        overflow-x: auto !important; 
        white-space: nowrap !important; 
        flex-wrap: nowrap !important; 
        gap: 10px !important;
        padding: 10px 4vw !important;
        width: 100vw !important;
        margin-left: -4vw !important; 
        scrollbar-width: none !important; 
    }
    .filter-bar::-webkit-scrollbar {
        display: none !important; 
    }
    .filter-btn {
        flex: 0 0 auto !important; 
    }

    /* --- PORTFOLIO EVOLUTION: Strict 2x2 Grid with Perfect Alignment --- */
    .portfolio-grid {
        display: grid !important;
        grid-template-columns: repeat(2, minmax(0, 1fr)) !important; 
        gap: 20px 15px !important; margin: 0 4vw 4rem !important; width: 92vw !important; 
        background: transparent !important; border: none !important; padding: 0 !important; overflow: visible !important; 
    }

    .portfolio-item, .portfolio-item.bento-large {
        grid-column: span 1 !important; display: flex !important; flex-direction: column !important; 
        justify-content: flex-start !important; align-items: stretch !important;
        height: auto !important; aspect-ratio: auto !important; background: transparent !important;
        border: none !important; padding: 0 !important; margin: 0 !important;
        overflow: visible !important; position: relative !important;
    }

    .portfolio-bg {
        position: relative !important; width: 100% !important; height: auto !important; aspect-ratio: 1 / 1 !important; 
        border-radius: 8px !important; overflow: hidden !important; box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3) !important;
        margin-bottom: 12px !important; flex-shrink: 0 !important;
    }

    .portfolio-bg .portfolio-img,
    .portfolio-bg img,
    .portfolio-bg video {
        position: absolute !important; inset: 0 !important;
        width: 100% !important; height: 100% !important;
        object-fit: cover !important; object-position: center !important; 
        transform: none !important; display: block !important;
    }

    .portfolio-item > .portfolio-img,
    .portfolio-item > img,
    .portfolio-item > video {
        position: relative !important;
        width: 100% !important;
        aspect-ratio: 1 / 1 !important; 
        height: auto !important;
        object-fit: cover !important; 
        object-position: center !important;
        border-radius: 8px !important;
        margin-bottom: 12px !important;
        flex-shrink: 0 !important;
        display: block !important;
    }

    .portfolio-overlay { display: none !important; }

    .portfolio-info {
        position: static !important; opacity: 1 !important; transform: none !important; padding: 0 4px 4px 4px !important; 
        background: none !important; background-color: transparent !important; text-align: left !important;
        width: 100% !important; display: block !important; flex-grow: 1 !important;
    }

    .portfolio-info h3 {
        font-size: 0.85rem !important; 
        line-height: 1.3 !important; 
        color: var(--white) !important;
        margin: 0 0 8px 0 !important; 
        font-weight: 700 !important; 
        white-space: normal !important; 
        word-wrap: break-word !important;
        display: -webkit-box !important;
        -webkit-line-clamp: 2 !important; 
        -webkit-box-orient: vertical !important;
        overflow: hidden !important;
        padding-top: 2px !important;
    }

    .portfolio-info span {
        font-size: 0.65rem !important; color: var(--accent) !important; letter-spacing: 0.05em !important;
        text-transform: uppercase !important; display: block !important; margin: 0 !important;
        padding-top: 2px !important;
    }

    /* --- Core Disciplines 2-Columns Square Grid --- */
    .skills-grid { display: grid !important; grid-template-columns: repeat(2, 1fr) !important; gap: 1.2rem !important; border: none !important; }
    .skill-card {
        padding: 1.2rem !important; display: flex !important; flex-direction: column !important;
        justify-content: center !important; align-items: center !important;
        aspect-ratio: 1 !important; border: 1px solid var(--border) !important; border-radius: 4px;
    }
    .skill-card .skill-icon { width: 36px !important; height: 36px !important; margin-bottom: 0.5rem !important; }
    .skill-card h4 { font-size: 0.88rem !important; }
    .skill-card p { font-size: 0.72rem !important; line-height: 1.4 !important; }

    /* --- Software Toolkit Matrix Optimization (4x2) --- */
    .software-grid { display: grid !important; grid-template-columns: repeat(4, 1fr) !important; gap: 1.2rem !important; max-width: 320px !important; margin: 3rem auto !important; }
    .software-grid span { grid-column: 1 / -1 !important; text-align: center; margin-bottom: 0.5rem !important; }
    .software-grid img { width: 42px !important; height: auto !important; }

    .social-platforms, .contact-wrapper { grid-template-columns: 1fr; }
    .hero-img-frame { flex-direction: column; height: auto; width: 100%; }


    /* ----------------------------------------------------------------------
       ✨✨✨ MODAL MOBILE OPTIMIZATION (CRITICAL BUG FIXES) ✨✨✨
       ---------------------------------------------------------------------- */
    #modal-overlay, #modal-overlay *, .modal, .modal * {
        box-sizing: border-box !important;
    }

    #modal-overlay, .modal-overlay {
        padding: 12px !important;
        max-width: 100vw !important;
        overflow-x: hidden !important;
    }

    .modal {
        padding: 1.5rem !important; 
        border-radius: 12px !important;
        width: 100% !important; 
        max-width: 100% !important;
        max-height: 85vh !important;
        position: relative !important;
        display: flex !important;
        flex-direction: column !important;
        min-width: 0 !important; 
    }

    .modal-close {
        top: 12px !important; right: 12px !important; background: rgba(0, 0, 0, 0.7) !important;
        border-radius: 50% !important; width: 36px !important; height: 36px !important;
        display: flex !important; align-items: center !important; justify-content: center !important;
        font-size: 1.3rem !important; color: #fff !important; 
        z-index: 10001 !important; 
    }

    .modal > div:not(.modal-close) {
        gap: 1.2rem !important; 
        flex-direction: column !important; 
        align-items: stretch !important;
        overflow-y: auto !important;
        overflow-x: hidden !important;
        max-height: 100% !important;
        width: 100% !important;
        min-width: 0 !important;
    }

    .modal > div:not(.modal-close) > div:nth-child(1) {
        flex: 0 0 38vh !important; 
        width: 100% !important; 
        height: 38vh !important; 
        max-height: 38vh !important; 
        display: flex !important; 
        flex-direction: column !important; 
        align-items: center !important; 
        justify-content: center !important;
        position: relative !important;
        background: rgba(0,0,0,0.2) !important; 
        border-radius: 8px !important;
        padding: 5px !important;
        min-width: 0 !important;
    }

    .modal > div:not(.modal-close) > div:nth-child(1) > div:first-child {
        flex: 1 1 auto !important;
        width: 100% !important;
        height: 100% !important;
        min-height: 0 !important; 
        display: flex !important;
        align-items: center !important;
        justify-content: center !important;
    }

    .gallery-nav-btn {
        width: 28px !important;
        height: 28px !important;
        font-size: 0.85rem !important;
    }

    .modal .portfolio-img,
    .modal > div:not(.modal-close) > div:nth-child(1) iframe {
        width: 100% !important;
        height: 100% !important;
        max-height: 100% !important;
        max-width: 100% !important;
        object-fit: contain !important; 
        object-position: center !important; 
        border-radius: 6px !important;
        margin: 0 auto !important;
    }

    .modal > div:not(.modal-close) > div:nth-child(1) a {
        height: auto !important;
        flex-shrink: 0 !important;
    }

    #gallery-counter {
        position: static !important; 
        display: inline-block !important;
        margin: 10px auto 5px auto !important; 
        background: rgba(0, 210, 255, 0.1) !important;
        border: 1px solid rgba(0, 210, 255, 0.3) !important;
        color: var(--accent) !important;
        padding: 5px 16px !important;
        border-radius: 20px !important;
        font-size: 0.75rem !important;
        letter-spacing: 2px !important;
        align-self: center;
    }

    .modal > div:not(.modal-close) > div:nth-child(2) {
        flex: 1 1 auto !important; 
        width: 100% !important; 
        display: flex !important; 
        flex-direction: column !important;
        min-width: 0 !important;
        padding: 2.5rem 12px 1.5rem 12px !important; 
        box-sizing: border-box !important;
    }

    .project-tag-container { 
        font-size: 0.7rem !important; 
        line-height: 1.6 !important; 
        margin-bottom: 0.6rem !important; 
    }
    
    .project-title-h2 { 
        font-size: 1.5rem !important; 
        line-height: 1.3 !important; 
        margin-bottom: 0.6rem !important; 
        word-break: break-word !important; 
        overflow-wrap: anywhere !important;
        white-space: normal !important;
    }
    
    .project-desc-p { font-size: 0.9rem !important; line-height: 1.6 !important; margin-bottom: 1.2rem !important; }
    .project-meta-details { gap: 1.5rem !important; padding-top: 1.2rem !important; flex-direction: column !important; }
    .project-meta-details > div { margin-bottom: 0.5rem !important; }
}

/* ==========================================================================
   ✨ Multi-Language Pure CSS Toggle Rules
   ========================================================================== */
html[lang="en"] .lang-zh { display: none !important; }
html[lang="zh"] .lang-en { display: none !important; }

/* ==========================================================================
   ✨ Back to Top Floating Action Button
   ========================================================================== */
.back-to-top {
    position: fixed; bottom: 40px; right: 40px; width: 50px; height: 50px;
    background: var(--accent); color: #000; border: none; border-radius: 50%;
    font-size: 1.5rem; cursor: pointer; z-index: 10000 !important; 
    opacity: 0; visibility: hidden; transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex; justify-content: center; align-items: center; box-shadow: 0 4px 15px rgba(0, 238, 255, 0.3);
}

.back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-5px); box-shadow: 0 8px 25px rgba(0, 238, 255, 0.6); }

@media (max-width: 900px) {
    .back-to-top { bottom: 25px !important; right: 25px !important; width: 45px !important; height: 45px !important; font-size: 1.3rem !important; }
}