/* ==========================================
   Minimalism Design - Simplified CSS
   ========================================== */

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

:root {
    --color-bg: #ffffff;
    --color-bg-secondary: #fefdfb;
    --color-surface: #ffffff;
    --color-surface-soft: #faf9f7;
    --color-text: #000000;
    --color-text-light: #555555;
    --color-text-weak: #888888;
    --color-accent: #000000;
    --color-border: #e0e0e0;
    --color-gold: #C2A46D;
    --color-gold-light: #E0C48F;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', sans-serif;
    --font-mono: 'Courier New', monospace;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    --transition: all 0.2s ease;

    /* Neomorphism Shadows */
    --shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.08), 0 2px 6px rgba(0, 0, 0, 0.04);
    --shadow-medium: 0 8px 20px rgba(0, 0, 0, 0.1), 0 4px 10px rgba(0, 0, 0, 0.05);
    --shadow-large: 0 12px 32px rgba(0, 0, 0, 0.12), 0 6px 16px rgba(0, 0, 0, 0.06);
    --shadow-inset: inset 0 2px 4px rgba(0, 0, 0, 0.08), inset 0 -2px 4px rgba(255, 255, 255, 0.6);
}

/* ==========================================
   Typography & Global Styles
   ========================================== */

html {
    height: 100%;
    scroll-behavior: smooth;
    scroll-padding-top: 100px;
}

@media (max-width: 600px) {
    html {
        scroll-padding-top: 420px;
    }
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    font-family: var(--font-family);
    background-color: var(--color-bg-secondary);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}

section {
    width: 100%;
    background-color: transparent;
    scroll-snap-align: start;
    opacity: 1;
    transition: opacity 0.3s ease-in-out;
}

section.section-hidden {
    display: none;
    opacity: 0;
}

section.section-visible {
    display: block;
    opacity: 1;
}

.container {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    box-sizing: border-box;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    line-height: 1.2;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

h1 {
    font-size: 2.5rem;
    color: var(--color-text);
    font-weight: 700;
    letter-spacing: -0.03em;
}

h2 {
    font-size: 1.8rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    font-weight: 700;
}

h3 {
    font-size: 1.1rem;
    color: var(--color-text);
    font-weight: 600;
}

p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

a {
    color: var(--color-gold);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--color-gold-light);
}

/* ==========================================
   Navigation
   ========================================== */

.navbar {
    background-color: var(--color-bg);
    border-bottom: none;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
    background-color: rgba(255, 255, 255, 0.8);
    box-shadow: var(--shadow-soft);
}

.navbar-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2.5rem;
    padding: 1.2rem var(--spacing-lg);
    flex-wrap: wrap;
    max-width: 900px;
    margin: 0 auto;
}

.nav-item {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    transition: var(--transition);
    text-decoration: none;
    letter-spacing: 0.3px;
}

.nav-item:first-child {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0;
}

.nav-item:hover {
    color: var(--color-gold);
}

.nav-item.active {
    color: var(--color-gold);
    border-bottom: 2px solid var(--color-gold);
    padding-bottom: 0.2rem;
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .navbar-content {
        gap: var(--spacing-md);
    }

    .nav-item {
        font-size: 0.9rem;
    }
}

/* ==========================================
   Hero Section
   ========================================== */

.hero {
    width: 100%;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--spacing-lg) 4rem var(--spacing-lg);
    text-align: center;
    box-sizing: border-box;
}

.hero .container {
    width: 100%;
    display: flex;
    justify-content: center;
}

.hero-content {
    max-width: 620px;
    margin: 6rem 0 0 0;
    padding: 4rem 2.5rem;
    background-color: var(--color-surface);
    border-radius: 28px;
    box-shadow: var(--shadow-soft);
    transition: var(--transition);
}

.hero-content:hover {
    box-shadow: var(--shadow-medium);
    transform: translateY(-4px);
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-lg);
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.subtitle {
    font-size: 1.3rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    font-weight: 400;
    letter-spacing: 0;
}

.description {
    font-size: 1rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    max-width: 550px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.8;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.cta-buttons .btn {
    min-width: 140px;
    text-align: center;
}

.btn {
    padding: 0.75rem 2rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.95rem;
    border: 1.5px solid var(--color-text);
    transition: var(--transition);
    cursor: pointer;
    display: inline-block;
    text-decoration: none;
    background-color: transparent;
    letter-spacing: 0.5px;
    box-shadow: var(--shadow-soft);
}

.btn-primary {
    background-color: var(--color-text);
    color: var(--color-bg);
    border-color: var(--color-text);
    box-shadow: var(--shadow-medium);
}

.btn-primary:hover {
    background-color: #333333;
    border-color: #333333;
    color: var(--color-bg);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12), 0 1px 4px rgba(0, 0, 0, 0.06);
    transform: translateY(-2px);
}

.btn-primary:active {
    box-shadow: var(--shadow-inset);
    transform: translateY(0);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text);
    border-color: var(--color-text);
}

.btn-secondary:hover {
    background-color: var(--color-bg-secondary);
    color: var(--color-text);
    border-color: var(--color-text);
    box-shadow: var(--shadow-soft);
    transform: translateY(-2px);
}

.btn-secondary:active {
    box-shadow: var(--shadow-inset);
    transform: translateY(0);
}

@media (max-width: 768px) {
    .hero-content {
        margin: 3.5rem 0 0 0;
    }

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

    .subtitle {
        font-size: 1rem;
    }

    .description {
        font-size: 0.95rem;
    }

    .cta-buttons {
        gap: var(--spacing-sm);
    }

    .btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
    }
}

/* ==========================================
   About Section
   ========================================== */

.about {
    width: 100%;
    padding: var(--spacing-2xl) var(--spacing-lg);
    box-sizing: border-box;
}

.about .container {
    max-width: 700px;
    background-color: transparent;
}

.about h2 {
    margin-bottom: var(--spacing-xl);
}

.about p {
    font-size: 1rem;
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

/* ==========================================
   Projects Section
   ========================================== */

.projects {
    width: 100%;
    padding: 2rem var(--spacing-lg) var(--spacing-2xl) var(--spacing-lg);
    box-sizing: border-box;
}

.projects h2 {
    margin-bottom: var(--spacing-xl);
    text-align: left;
}

.projects-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.project-card {
    display: flex;
    flex-direction: column;
    padding: var(--spacing-xl);
    border: none;
    border-radius: 16px;
    background-color: var(--color-bg);
    transition: var(--transition);
    box-shadow: var(--shadow-soft);
    margin-bottom: var(--spacing-md);
}

.project-card:hover {
    box-shadow: var(--shadow-medium);
    transform: translateY(-4px);
}

.project-card h3 {
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    margin-top: 0;
    font-weight: 700;
}

.project-card p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
    line-height: 1.7;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: auto;
    margin-top: var(--spacing-md);
}

.tag {
    display: inline-block;
    background-color: var(--color-bg);
    color: var(--color-text-light);
    padding: 0.4rem 0.8rem;
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid var(--color-border);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.tag:hover {
    background-color: var(--color-bg-secondary);
    border-color: var(--color-text-light);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
    transform: translateY(-1px);
}

.project-link {
    display: inline-block;
    margin-top: var(--spacing-md);
    color: var(--color-text);
    background-color: transparent;
    border: none;
    padding: 0;
    border-radius: 0;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    text-align: left;
}

.project-link:hover {
    color: var(--color-gold);
}

/* ==========================================
   Research Interests Section
   ========================================== */

.interests {
    width: 100%;
    padding: 2rem var(--spacing-lg) var(--spacing-2xl) var(--spacing-lg);
    box-sizing: border-box;
}

.interests>.container {
    text-align: center;
}

.interests h2 {
    margin-bottom: var(--spacing-lg);
    text-align: left;
}

.interests-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    justify-content: center;
}

.interest-tag {
    background-color: transparent;
    color: var(--color-text-light);
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 400;
    transition: var(--transition);
    cursor: default;
    box-shadow: none;
}

.interest-tag:hover {
    border-color: var(--color-text);
    background-color: var(--color-bg-secondary);
    color: var(--color-text);
}

/* ==========================================
   Hobbies Section
   ========================================== */

.hobbies {
    width: 100%;
    padding: 2rem var(--spacing-lg) var(--spacing-2xl) var(--spacing-lg);
    box-sizing: border-box;
}

.hobbies h2 {
    margin-bottom: var(--spacing-xl);
}

.hobbies-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

.hobby-card {
    display: flex;
    flex-direction: column;
    padding: var(--spacing-xl);
    border: none;
    border-radius: 16px;
    background-color: var(--color-bg);
    transition: var(--transition);
    box-shadow: var(--shadow-soft);
}

.hobby-card:hover {
    box-shadow: var(--shadow-medium);
    transform: translateY(-4px);
}

.hobby-card h3 {
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.hobby-showcase {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    flex-grow: 1;
    min-height: auto;
    min-width: 0;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-inset);
}

.hobby-showcase p {
    color: var(--color-text-weak);
    font-size: 0.9rem;
    text-align: center;
}

.videos-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    width: 100%;
}

.video-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
}

.video-item iframe {
    width: 100% !important;
    height: auto !important;
    aspect-ratio: 16 / 9;
}

.video-item video {
    width: 100%;
    height: auto;
    background-color: #000;
}

.cooking-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    width: 100%;
}

.dish-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
}

.dish-item img {
    width: 100%;
    height: auto;
}

/* ==========================================
   Skills Section
   ========================================== */

.skills {
    width: 100%;
    padding: 2rem var(--spacing-lg) var(--spacing-2xl) var(--spacing-lg);
    box-sizing: border-box;
}

.skills h2 {
    margin-bottom: var(--spacing-xl);
    text-align: left;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.skill-category {
    padding: var(--spacing-xl);
    background-color: var(--color-bg);
    border: none;
    border-radius: 14px;
    transition: var(--transition);
    box-shadow: var(--shadow-soft);
}

.skill-category:hover {
    box-shadow: var(--shadow-medium);
    transform: translateY(-3px);
}

.skill-category h3 {
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.skill-category p {
    color: var(--color-text-light);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ==========================================
   Contact Section
   ========================================== */

.contact {
    width: 100%;
    padding: var(--spacing-2xl) var(--spacing-lg);
    text-align: center;
    box-sizing: border-box;
}

.contact>.container {
    max-width: 700px;
}

.contact h2 {
    margin-bottom: var(--spacing-lg);
    border: none;
    padding-bottom: 0;
}

.contact>.container>p:nth-of-type(1) {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

.contact-info {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    padding: 2rem 1.5rem;
    border: none;
    border-radius: 28px;
    background-color: var(--color-surface);
    box-shadow: var(--shadow-soft);
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    cursor: pointer;
}

.contact-info:hover {
    box-shadow: var(--shadow-medium);
    transform: translateY(-4px);
}

.contact-info p {
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
    color: var(--color-text-light);
}

.contact-info strong {
    color: var(--color-text);
    font-weight: 600;
}

.contact-info a {
    color: var(--color-gold);
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
}

.contact-info a:hover {
    color: var(--color-gold-light);
}

.wechat-link {
    color: var(--color-gold);
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
}

.wechat-link:hover {
    color: var(--color-gold-light);
    text-decoration: underline;
}

/* ==========================================
   Footer
   ========================================== */

.footer {
    margin-top: auto;
    padding: var(--spacing-lg);
    background-color: var(--color-bg);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer p {
    color: var(--color-text-light);
    font-size: 0.9rem;
    margin: 0;
}

/* ==========================================
   Responsive Design
   ========================================== */

@media (max-width: 768px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 2.5rem;
        --spacing-lg: 1.75rem;
    }

    h1 {
        font-size: 1.6rem;
    }

    h2 {
        font-size: 1.3rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

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

    .interests-grid {
        justify-content: flex-start;
        gap: var(--spacing-sm);
    }

    .interest-tag {
        font-size: 0.85rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .hero {
        padding: 8rem var(--spacing-md) 2rem var(--spacing-md);
        min-height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .hero-content {
        padding: 2rem 1.5rem;
        max-width: 85%;
        margin: 2rem auto 0;
        width: 100%;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
    }

    .hero h1 {
        font-size: 1.8rem;
        margin-bottom: var(--spacing-md);
    }

    .subtitle {
        font-size: 1.05rem;
        margin-bottom: var(--spacing-lg);
    }

    .description {
        font-size: 0.95rem;
        max-width: 100%;
    }

    .about,
    .interests {
        padding: 2.5rem var(--spacing-md) var(--spacing-xl) var(--spacing-md);
    }

    .contact {
        padding: 3.5rem var(--spacing-md) var(--spacing-xl) var(--spacing-md);
    }

    .projects {
        padding: 2.5rem var(--spacing-md) var(--spacing-xl) var(--spacing-md);
    }

    .skills {
        padding: 2.5rem var(--spacing-md) var(--spacing-xl) var(--spacing-md);
    }

    .hobbies {
        padding: 2.5rem var(--spacing-md) var(--spacing-xl) var(--spacing-md);
    }

    .project-card {
        padding: var(--spacing-lg);
    }

    .skill-category {
        padding: var(--spacing-md);
    }
}

@media (max-width: 600px) {
    :root {
        --spacing-lg: 1.5rem;
        --spacing-md: 1rem;
        --spacing-xl: 1.5rem;
        --spacing-2xl: 2rem;
    }

    h1 {
        font-size: 1.4rem;
    }

    h2 {
        font-size: 1.1rem;
        margin-bottom: var(--spacing-lg);
        text-align: left;
    }

    .interests h2 {
        text-align: left;
    }

    .projects h2 {
        text-align: left;
    }

    .skills h2 {
        text-align: left;
    }

    .contact h2 {
        text-align: center;
    }

    .hero {
        padding: 4rem var(--spacing-md) 2rem var(--spacing-md);
        min-height: auto;
    }

    .hero-content {
        padding: 1.5rem 1rem;
        max-width: 100%;
    }

    .hero h1 {
        font-size: 1.3rem;
        margin-bottom: var(--spacing-md);
    }

    .subtitle {
        font-size: 0.95rem;
        margin-bottom: var(--spacing-md);
        line-height: 1.5;
    }

    .description {
        font-size: 0.9rem;
        margin-bottom: var(--spacing-lg);
        line-height: 1.6;
    }

    .cta-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .btn {
        width: 100%;
        text-align: center;
        padding: 0.6rem 1rem;
        font-size: 0.95rem;
    }

    .about {
        padding: 2.5rem var(--spacing-md) var(--spacing-lg) var(--spacing-md);
    }

    .contact {
        padding: 3.5rem var(--spacing-md) var(--spacing-lg) var(--spacing-md);
    }

    .projects,
    .interests,
    .skills,
    .hobbies {
        padding: 2.5rem var(--spacing-md) var(--spacing-lg) var(--spacing-md);
    }

    .project-card,
    .skill-category {
        padding: var(--spacing-md);
    }

    .hobby-card {
        padding: var(--spacing-sm);
    }

    .hobby-showcase {
        padding: var(--spacing-sm);
    }

    .videos-container,
    .cooking-gallery {
        grid-template-columns: 1fr;
    }

    .contact-info {
        padding: var(--spacing-md);
        max-width: 100%;
    }

    .contact-info p {
        font-size: 0.9rem;
        word-break: break-word;
        overflow-wrap: break-word;
    }

    .contact-info a {
        display: inline;
        word-break: break-word;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-lg: 1.2rem;
        --spacing-md: 0.8rem;
        --spacing-xl: 1.2rem;
    }

    h1 {
        font-size: 1.2rem;
    }

    h2 {
        font-size: 1rem;
        margin-bottom: var(--spacing-lg);
        padding-bottom: var(--spacing-sm);
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .hero {
        padding: 3rem var(--spacing-md) 1.5rem var(--spacing-md);
    }

    .hero-content {
        padding: 1.2rem 0.8rem;
        border-radius: 16px;
    }

    .hero h1 {
        font-size: 1.1rem;
        margin-bottom: var(--spacing-sm);
    }

    .subtitle {
        font-size: 0.9rem;
        margin-bottom: var(--spacing-md);
    }

    .description {
        font-size: 0.85rem;
        margin-bottom: var(--spacing-md);
    }

    .btn {
        padding: 0.5rem 0.8rem;
        font-size: 0.9rem;
    }

    .about,
    .projects,
    .interests,
    .skills,
    .hobbies {
        padding: 2.5rem var(--spacing-md) var(--spacing-lg) var(--spacing-md);
    }

    .contact {
        padding: 3.5rem var(--spacing-md) var(--spacing-lg) var(--spacing-md);
    }

    .project-card {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }

    .project-card h3 {
        font-size: 1rem;
        margin-bottom: var(--spacing-sm);
    }

    .tag {
        font-size: 0.7rem;
        padding: 0.3rem 0.6rem;
    }
}

/* ==========================================
   Print Styles
   ========================================== */

@media print {
    .navbar,
    .footer {
        display: none;
    }

    body {
        background-color: white;
    }
}

/* ==========================================
   Scroll Animation
   ========================================== */

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

section {
    opacity: 1;
    will-change: opacity, transform;
}

section.section-visible {
    opacity: 1 !important;
    display: block !important;
    animation: fadeInUp 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

section.section-hidden {
    display: none !important;
    opacity: 0 !important;
}

/* ==========================================
   YJ AI Assistant
   ========================================== */

#yj-assistant {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    font-family: var(--font-family);
    z-index: 9999;
}

/* Toggle Button */
.yj-toggle {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: white;
    color: var(--color-text);
    border: 1.5px solid var(--color-text);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.yj-toggle:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    background: var(--color-bg-secondary);
}

.yj-toggle:active {
    transform: translateY(-2px);
}

.yj-toggle svg {
    width: 28px;
    height: 28px;
}

/* Chat Window */
.yj-chat {
    position: absolute;
    bottom: 80px;
    right: 0;
    width: 400px;
    max-height: 600px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
    display: flex;
    flex-direction: column;
    opacity: 0;
    pointer-events: none;
    transform: translateY(20px) scale(0.95);
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

.yj-chat.open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0) scale(1);
}

/* Header */
.yj-header {
    padding: 1.25rem;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: white;
    border-radius: 12px 12px 0 0;
}

.yj-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.yj-name {
    font-weight: 600;
    font-size: 1rem;
    color: var(--color-text);
    letter-spacing: 0.5px;
}

.yj-status {
    font-size: 0.75rem;
    color: #22c55e;
    font-weight: 500;
    padding: 0.2rem 0.5rem;
    background: rgba(34, 197, 94, 0.1);
    border-radius: 4px;
}

.yj-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-text-light);
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.yj-close:hover {
    color: var(--color-text);
}

/* Messages Container */
.yj-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    background: white;
}

.yj-message {
    display: flex;
    margin-bottom: 0.5rem;
}

.yj-message.user {
    justify-content: flex-end;
}

.yj-message p {
    max-width: 80%;
    padding: 0.75rem 1rem;
    border-radius: 10px;
    font-size: 0.95rem;
    line-height: 1.4;
    word-wrap: break-word;
    margin: 0;
}

.yj-message.user p {
    background: var(--color-text);
    color: white;
    border-radius: 10px 4px 10px 10px;
}

.yj-message.assistant p {
    background: var(--color-bg-secondary);
    color: var(--color-text);
    border-radius: 10px 10px 4px 10px;
}

.yj-message.loading p {
    display: flex;
    gap: 4px;
    align-items: center;
}

.dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-text);
    animation: pulse 1.4s infinite;
}

.dot:nth-child(2) {
    animation-delay: 0.2s;
}

.dot:nth-child(3) {
    animation-delay: 0.4s;
}

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

/* Input Area */
.yj-input-area {
    padding: 1rem;
    border-top: 1px solid var(--color-border);
    display: flex;
    gap: 0.5rem;
    background: white;
    border-radius: 0 0 12px 12px;
}

.yj-input {
    flex: 1;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 0.7rem 0.9rem;
    font-family: var(--font-family);
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition);
    background: white;
}

.yj-input:focus {
    border-color: var(--color-text);
    box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.05);
}

.yj-input::placeholder {
    color: var(--color-text-weak);
}

.yj-send {
    width: 40px;
    height: 40px;
    background: var(--color-text);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    padding: 0;
}

.yj-send:hover {
    background: var(--color-text-light);
    transform: translateY(-2px);
}

.yj-send:active {
    transform: translateY(0);
}

.yj-send svg {
    width: 20px;
    height: 20px;
}

/* Scrollbar Styling */
.yj-messages::-webkit-scrollbar {
    width: 6px;
}

.yj-messages::-webkit-scrollbar-track {
    background: transparent;
}

.yj-messages::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

.yj-messages::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-light);
}

/* Responsive Design for YJ */
@media (max-width: 600px) {
    #yj-assistant {
        bottom: 1rem;
        right: 1rem;
    }

    .yj-toggle {
        width: 52px;
        height: 52px;
    }

    .yj-toggle svg {
        width: 26px;
        height: 26px;
    }

    .yj-chat {
        width: calc(100vw - 2rem);
        max-width: 400px;
        max-height: calc(100vh - 120px);
        bottom: 65px;
    }
}