/* ============================================
   Chloe Sun — Personal Website Hero Prototype
   Style: Minimal, Editorial, Professional
   ============================================ */

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

:root {
    /* Neutral palette — editorial calm */
    --color-bg: #faf9f7;
    --color-surface: #ffffff;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #6b6b6b;
    --color-text-tertiary: #9a9a9a;
    --color-accent: #2c2c2c;
    --color-border: #e8e6e3;
    --color-border-light: #f0eeeb;
    
    /* Typography */
    --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
    --font-sans: "Inter", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ---- Navigation ---- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg) var(--space-3xl);
    background-color: rgba(250, 249, 247, 0.92);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-border-light);
}

.nav-brand {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-weight: 400;
    letter-spacing: 0.02em;
    color: var(--color-text-primary);
    text-decoration: none;
}

.nav-brand-link {
    text-decoration: none;
    color: inherit;
}

.nav-links {
    display: flex;
    gap: var(--space-md);
    align-items: center;
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 400;
    letter-spacing: 0.03em;
    color: var(--color-text-secondary);
    text-decoration: none;
    cursor: pointer;
    transition: color var(--transition-fast);
    padding: var(--space-xs) 0;
}

.nav-link:hover {
    color: var(--color-text-primary);
}

.nav-divider {
    width: 1px;
    height: 16px;
    background-color: var(--color-border);
    margin: 0 var(--space-sm);
}

.nav-links {
    display: flex;
    gap: var(--space-md);
    align-items: center;
}

.nav-lang {
    font-size: 0.8125rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    color: var(--color-text-tertiary);
    cursor: pointer;
    transition: color var(--transition-fast);
    text-transform: uppercase;
    padding: var(--space-xs) 0;
}

.nav-lang:not(:last-child) {
    margin-right: var(--space-md);
}

.nav-lang.active {
    color: var(--color-text-primary);
    font-weight: 500;
}

.nav-lang:hover {
    color: var(--color-text-secondary);
}

/* ---- Hero Section ---- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--space-4xl) var(--space-3xl);
    padding-top: calc(var(--space-4xl) + 60px);
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 0.8fr;
    gap: var(--space-4xl);
    align-items: center;
    width: 100%;
}

/* ---- Hero Content ---- */
.hero-content {
    max-width: 560px;
}

.hero-name {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: 0.01em;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.hero-name-en {
    font-family: var(--font-sans);
    font-size: 0.65em;
    font-weight: 300;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-text-secondary);
    margin-left: var(--space-sm);
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
    font-weight: 400;
    color: var(--color-text-primary);
    line-height: 1.4;
    margin-bottom: var(--space-xs);
}

.hero-title-en {
    font-size: 0.9375rem;
    font-weight: 300;
    color: var(--color-text-secondary);
    letter-spacing: 0.03em;
    margin-bottom: var(--space-2xl);
}

.hero-scenarios-text {
    font-size: 0.9375rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    letter-spacing: 0.04em;
    margin-bottom: var(--space-2xl);
    line-height: 1.5;
}

.hero-description {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-2xl);
}

.hero-location {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    letter-spacing: 0.02em;
    margin-bottom: var(--space-3xl);
}

.location-sep {
    color: var(--color-border);
}

.hero-ctas {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-size: 0.875rem;
    font-weight: 400;
    letter-spacing: 0.06em;
    text-decoration: none;
    border-radius: 2px;
    transition: all var(--transition-base);
    cursor: pointer;
    min-width: 140px;
    text-align: center;
}

.btn-primary {
    background-color: var(--color-accent);
    color: #ffffff;
    border: 1px solid var(--color-accent);
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--color-accent);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-text-primary);
}

/* ---- Hero Image ---- */
.hero-image {
    display: flex;
    align-items: center;
    justify-content: center;
}

.photo-placeholder {
    width: 100%;
    max-width: 420px;
    aspect-ratio: 3 / 4;
    background-color: var(--color-border-light);
    border: 1px solid var(--color-border);
    border-radius: 2px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    color: var(--color-text-tertiary);
    transition: all var(--transition-base);
}

.photo-placeholder:hover {
    border-color: var(--color-border);
    background-color: #f5f3f0;
}

.photo-placeholder svg {
    opacity: 0.4;
}

.photo-placeholder span {
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-weight: 400;
}

/* ---- Services Section ---- */
.services {
    padding: var(--space-3xl) var(--space-3xl);
    border-top: 1px solid var(--color-border);
}

.services-container {
    max-width: 900px;
    margin: 0 auto;
}

.services-header {
    margin-bottom: var(--space-3xl);
}

.services-title {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 400;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.services-title-en {
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
}

.services-intro {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    max-width: 480px;
    padding-top: 0.2em;
}

.services-list {
    display: flex;
    flex-direction: column;
}

.service-item {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: var(--space-xl);
    padding: var(--space-xl) 0;
}

.service-number {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    color: var(--color-text-tertiary);
    padding-top: 0.2em;
}

.service-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.service-name {
    font-family: var(--font-serif);
    font-size: clamp(1.125rem, 1.75vw, 1.375rem);
    font-weight: 400;
    color: var(--color-text-primary);
    line-height: 1.3;
}

.service-details {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    white-space: normal;
}

.service-details br {
    display: none;
}

.service-divider {
    border: none;
    border-top: 1px solid var(--color-border-light);
    margin: 0;
}

/* ---- Selected Experience Section ---- */
.experience {
    padding: var(--space-3xl) var(--space-3xl);
    border-top: 1px solid var(--color-border);
}

.experience-container {
    max-width: 900px;
    margin: 0 auto;
}

.experience-header {
    margin-bottom: var(--space-3xl);
}

.experience-title {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 400;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.experience-title-en {
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
}

.experience-list {
    display: flex;
    flex-direction: column;
}

.experience-item {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: var(--space-2xl);
    padding: var(--space-2xl) 0;
}

.experience-number {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    color: var(--color-text-tertiary);
    padding-top: 0.2em;
}

.experience-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.experience-category {
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-xs);
}

.experience-name {
    font-family: var(--font-serif);
    font-size: clamp(1.25rem, 2vw, 1.5rem);
    font-weight: 400;
    color: var(--color-text-primary);
    line-height: 1.3;
    margin-bottom: var(--space-sm);
}

.experience-desc {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    max-width: 640px;
}

.experience-tags {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
    letter-spacing: 0.04em;
    line-height: 1.5;
}

.experience-divider {
    border: none;
    border-top: 1px solid var(--color-border-light);
    margin: 0;
}

.experience-other {
    margin-top: var(--space-3xl);
    padding-top: var(--space-2xl);
    border-top: 1px solid var(--color-border-light);
}

.experience-other-title {
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-sm);
}

.experience-other p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    letter-spacing: 0.02em;
    line-height: 1.6;
}

/* ---- About Section ---- */
.about {
    padding: var(--space-4xl) var(--space-3xl);
    border-top: 1px solid var(--color-border);
}

.about-container {
    max-width: 900px;
    margin: 0 auto;
}

.about-header {
    margin-bottom: var(--space-3xl);
}

.about-title {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 400;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.about-title-en {
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: var(--space-4xl);
    align-items: start;
}

.about-text {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.about-text p {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    max-width: 560px;
}

.about-photo {
    display: flex;
    justify-content: flex-end;
}

.photo-placeholder--about {
    width: 100%;
    max-width: 280px;
    aspect-ratio: 4 / 5;
}

/* ---- Contact Section ---- */
.contact {
    padding: var(--space-4xl) var(--space-3xl);
    border-top: 1px solid var(--color-border);
}

.contact-container {
    max-width: 900px;
    margin: 0 auto;
}

.contact-header {
    margin-bottom: var(--space-3xl);
}

.contact-title {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 400;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.contact-title-en {
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
}

.contact-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xl);
}

.contact-intro {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    max-width: 560px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border-light);
}

.contact-email {
    font-size: 1.125rem;
    color: var(--color-text-primary);
    letter-spacing: 0.02em;
}

.contact-email a {
    color: var(--color-text-primary);
    text-decoration: none;
    border-bottom: 1px solid var(--color-border);
    transition: border-color var(--transition-fast);
}

.contact-email a:hover {
    border-color: var(--color-text-primary);
}

.contact-location {
    font-size: 0.9375rem;
    color: var(--color-text-tertiary);
    letter-spacing: 0.02em;
    line-height: 1.6;
}

.contact-location br {
    display: none;
}

/* ---- Publications Section ---- */
.publications {
    padding: var(--space-4xl) var(--space-3xl);
    border-top: 1px solid var(--color-border);
}

.publications-container {
    max-width: 900px;
    margin: 0 auto;
}

.publications-header {
    margin-bottom: var(--space-2xl);
}

.publications-title {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 400;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.publications-title-en {
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
}

.publications-intro {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    max-width: 640px;
    margin-bottom: var(--space-3xl);
}

.publication-list {
    display: flex;
    flex-direction: column;
}

.publication-item {
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: var(--space-2xl);
    align-items: start;
}

.publication-cover {
    width: 100%;
}

.publication-cover img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 2px;
}

.publication-body {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.publication-meta-line {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
    letter-spacing: 0.04em;
    margin-bottom: var(--space-md);
}

.publication-title {
    font-family: var(--font-serif);
    font-size: clamp(1.25rem, 2vw, 1.5rem);
    font-weight: 400;
    color: var(--color-text-primary);
    line-height: 1.4;
}

.publication-author,
.publication-translator,
.publication-publisher {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.publication-divider {
    border: none;
    border-top: 1px solid var(--color-border-light);
    margin: var(--space-md) 0;
}

.publication-contribution-label {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-xs);
}

.publication-contribution {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    max-width: 640px;
}

.publication-attribution {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    font-style: italic;
    letter-spacing: 0.02em;
}

.publication-item {
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: var(--space-2xl);
    align-items: start;
}

.publication-cover {
    width: 100%;
    max-width: 140px;
}

.publication-cover img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 2px;
}

/* ---- Footer ---- */
.footer {
    padding: var(--space-3xl) var(--space-3xl);
    border-top: 1px solid var(--color-border);
}

.footer-container {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.footer-brand {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-weight: 400;
    color: var(--color-text-primary);
}

.footer-tagline {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
    letter-spacing: 0.05em;
}

.footer-nav {
    display: flex;
    gap: var(--space-lg);
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border-light);
}

.footer-nav-link {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
    text-decoration: none;
    letter-spacing: 0.04em;
    transition: color var(--transition-fast);
}

.footer-nav-link:hover {
    color: var(--color-text-primary);
}

/* ---- Mobile Navigation ---- */
.nav-menu-btn {
    display: none;
    font-size: 0.875rem;
    font-weight: 400;
    letter-spacing: 0.03em;
    color: var(--color-text-secondary);
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs) 0;
    font-family: var(--font-sans);
}

.nav-menu-btn:hover {
    color: var(--color-text-primary);
}

/* ---- Responsive: Tablet ---- */
@media (max-width: 960px) {
    .hero-container {
        gap: var(--space-3xl);
    }
    
    .hero-image {
        max-width: 320px;
    }
    
    .services {
        padding: var(--space-2xl) var(--space-2xl);
    }
    
    .services-header {
        margin-bottom: var(--space-2xl);
    }
    
    .service-item {
        gap: var(--space-lg);
    }
}

/* ---- Responsive: Mobile ---- */
@media (max-width: 768px) {
    :root {
        --space-3xl: 2rem;
        --space-4xl: 3rem;
    }
    
    .nav {
        padding: var(--space-md) var(--space-lg);
    }

    .nav-menu-btn {
        display: block;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        padding: var(--space-lg) var(--space-lg) var(--space-xl);
        gap: var(--space-sm);
    }

    .nav-links--open {
        display: flex;
    }

    .nav-links .nav-link {
        padding: var(--space-sm) 0;
        font-size: 1rem;
        text-align: left;
    }

    .nav-links .nav-divider {
        width: 100%;
        height: 1px;
        margin: var(--space-sm) 0;
        background-color: var(--color-border-light);
    }

    .nav-links .nav-lang-group {
        display: flex;
        gap: var(--space-lg);
        padding: var(--space-sm) 0;
    }

    .nav-links .nav-lang {
        font-size: 0.875rem;
    }

    .nav-links .nav-lang:not(:last-child) {
        margin-right: 0;
    }

    .hero {
        padding: var(--space-3xl) var(--space-lg);
        padding-top: calc(var(--space-3xl) + 50px);
        min-height: auto;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }
    
    .hero-content {
        max-width: 100%;
    }
    
    .hero-image {
        order: 2;
        max-width: 240px;
        margin: 0 auto;
    }
    
    .hero-name-en {
        display: block;
        margin-left: 0;
        margin-top: var(--space-xs);
        font-size: 0.75rem;
    }
    
    .hero-location {
        flex-wrap: wrap;
        gap: var(--space-xs);
    }
    
    .hero-ctas {
        flex-direction: row;
        gap: var(--space-sm);
    }

    .btn {
        flex: 1;
        min-width: 0;
        padding: 0.875rem 1rem;
        font-size: 0.875rem;
    }
    
    .services {
        padding: var(--space-2xl) var(--space-lg);
    }
    
    .services-header {
        grid-template-columns: 1fr;
        gap: var(--space-md);
        margin-bottom: var(--space-2xl);
    }
    
    .services-title-en {
        margin-bottom: var(--space-sm);
    }
    
    .service-item {
        grid-template-columns: 40px 1fr;
        gap: var(--space-md);
        padding: var(--space-lg) 0;
    }
    
    .service-details {
        white-space: normal;
        font-size: 0.875rem;
    }
    
    .service-details br {
        display: block;
    }
    
    .experience-category {
        margin-bottom: var(--space-xs);
    }
    
    .experience {
        padding: var(--space-2xl) var(--space-lg);
    }
    
    .experience-item {
        grid-template-columns: 45px 1fr;
        gap: var(--space-lg);
        padding: var(--space-xl) 0;
    }
    
    .experience-desc {
        font-size: 0.875rem;
    }
    
    .about {
        padding: var(--space-3xl) var(--space-2xl);
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }
    
    .about-photo {
        justify-content: flex-start;
    }

    .photo-placeholder--about {
        max-width: 240px;
    }

    .publication-item {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .publication-cover {
        max-width: 160px;
        margin: 0 auto var(--space-md);
    }

    .contact {
        padding: var(--space-3xl) var(--space-2xl);
    }
    
    .footer {
        padding: var(--space-2xl) var(--space-2xl);
    }

    .publications {
        padding-top: calc(var(--space-3xl) + 50px);
    }
}

/* ---- Reduced Motion ---- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
}