/* ===========================
   CSS Variables
   =========================== */
:root {
    --bg-primary: #FAF8F4;
    --bg-secondary: #F3EFE9;
    --bg-card: rgba(255, 255, 255, 0.7);
    --bg-card-hover: rgba(255, 255, 255, 0.9);

    --text-primary: #2A2520;
    --text-secondary: #6B655E;
    --text-tertiary: #9A938B;
    --text-inverse: #FAF8F4;

    --accent: #A67C52;
    --accent-light: #C9A96E;
    --accent-dark: #8B6539;
    --accent-bg: rgba(166, 124, 82, 0.08);

    --gold: #C4A35A;
    --gold-light: #E8D5A0;

    --border: #E8E3DB;
    --border-light: #F0ECE5;

    --shadow-sm: 0 2px 8px rgba(42, 37, 32, 0.06);
    --shadow-md: 0 4px 20px rgba(42, 37, 32, 0.08);
    --shadow-lg: 0 8px 40px rgba(42, 37, 32, 0.12);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --font-serif-cn: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
    --font-serif-en: 'Cormorant Garamond', 'Georgia', serif;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;

    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    --section-padding: 120px;
    --container-max: 1200px;
}

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

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

body {
    font-family: var(--font-serif-cn);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.8;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* ===========================
   Navigation
   =========================== */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: all var(--transition-base);
}

#navbar.scrolled {
    padding: 12px 0;
    background: rgba(250, 248, 244, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-serif-en);
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: var(--text-primary);
    transition: color var(--transition-base);
}

#navbar.scrolled .nav-logo {
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: 36px;
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-base);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1.5px;
    background: var(--gold);
    transition: width var(--transition-base);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

#navbar.scrolled .nav-links a {
    color: var(--text-secondary);
}

.nav-links a:hover {
    color: var(--accent);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

#navbar.scrolled .nav-toggle span {
    background: var(--text-primary);
}

.mobile-menu-overlay {
    display: flex;
    visibility: hidden;
    pointer-events: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(250, 248, 244, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 999;
    opacity: 0;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.mobile-menu-overlay.active {
    visibility: visible;
    pointer-events: auto;
    opacity: 1;
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    gap: 40px;
}

.mobile-nav-links a {
    font-family: var(--font-serif-cn);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: color var(--transition-base);
}

.mobile-nav-links a:hover {
    color: var(--accent);
}

/* ===========================
   Hero Section
   =========================== */
#hero {
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 40px 80px;
}

.hero-inner {
    max-width: var(--container-max);
    width: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 60px;
}

.hero-text {
    flex: 1;
    min-width: 0;
}

.hero-photo {
    flex: 0 0 42%;
    max-width: 42%;
}

.hero-photo img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    object-fit: cover;
}

.hero-name {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 20px;
}

.hero-name-en {
    font-family: var(--font-serif-en);
    font-size: clamp(2.2rem, 5vw, 4rem);
    font-weight: 600;
    letter-spacing: 3px;
    line-height: 1.1;
    color: var(--text-primary);
}

.hero-name-cn {
    font-family: var(--font-serif-cn);
    font-size: clamp(1.3rem, 3vw, 2.2rem);
    font-weight: 500;
    letter-spacing: 8px;
    color: var(--text-secondary);
}

.hero-tagline {
    font-size: clamp(1rem, 2vw, 1.2rem);
    letter-spacing: 6px;
    margin-bottom: 24px;
    color: var(--text-secondary);
    font-weight: 400;
}

.hero-divider {
    width: 60px;
    height: 1px;
    background: var(--gold);
    margin: 0 0 24px;
}

.hero-subtitle {
    font-size: clamp(0.9rem, 1.5vw, 1.05rem);
    margin-bottom: 28px;
    font-weight: 400;
    letter-spacing: 1px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.hero-titles {
    display: none;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 0.72rem;
    color: var(--text-tertiary);
    letter-spacing: 0.5px;
    font-family: var(--font-sans);
}

.hero-titles .dot {
    color: var(--gold);
}

.scroll-indicator {
    display: none;
}

.scroll-arrow {
    display: none;
}

/* ===========================
   Section Common
   =========================== */
.section-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--section-padding) 40px;
}

.section-header {
    text-align: center;
    margin-bottom: 72px;
}

.section-label {
    font-family: var(--font-serif-en);
    font-size: 0.85rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 12px;
}

.section-title {
    font-family: var(--font-serif-cn);
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 3px;
}

/* ===========================
   About Section
   =========================== */
#about {
    background: var(--bg-primary);
}

.about-layout {
    display: flex;
    flex-direction: column;
    gap: 60px;
}

.about-text {
    order: 1;
}

.about-photos {
    order: 2;
}

.photo-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.photo-grid--bottom {
    grid-template-columns: repeat(4, 1fr);
}

.photo-item {
    border-radius: var(--radius-sm);
    overflow: hidden;
    cursor: pointer;
    position: relative;
}

.photo-item::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: transparent;
    transition: background var(--transition-base);
}

.photo-item:hover::after {
    background: rgba(166, 124, 82, 0.1);
}

.photo-item img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.photo-item:hover img {
    transform: scale(1.05);
}

.about-text-content {
    max-width: 800px;
    margin: 0 auto 48px;
}

.about-text-content p {
    font-size: 1rem;
    line-height: 2;
    color: var(--text-secondary);
    margin-bottom: 20px;
    text-align: justify;
}

.about-credentials {
    max-width: 800px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px 32px;
    padding: 36px 40px;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
}

.credential-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.credential-icon {
    color: var(--gold);
    font-size: 0.6rem;
    margin-top: 6px;
    flex-shrink: 0;
}

/* ===========================
   Journey Section
   =========================== */
#journey {
    background: var(--bg-secondary);
}

.journey-content {
    display: flex;
    flex-direction: column;
    gap: 60px;
}

.journey-text {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.journey-text p {
    font-size: 1rem;
    line-height: 2;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.journey-timeline {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    padding-left: 32px;
}

.journey-timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(180deg, var(--accent-light), var(--gold-light), transparent);
}

.timeline-item {
    position: relative;
    margin-bottom: 36px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -29px;
    top: 6px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 2px solid var(--accent);
    z-index: 1;
}

.timeline-item:first-child .timeline-dot {
    background: var(--accent);
}

.timeline-content h4 {
    font-family: var(--font-serif-en);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 4px;
    letter-spacing: 1px;
}

.timeline-content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Group Photo Grid */
.group-photo-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.group-photo-item {
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.group-photo-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.group-photo-item img {
    width: 100%;
    height: 300px;
    object-fit: cover;
}

/* 3-column photo grid for journey section */
.group-photo-grid--3col {
    grid-template-columns: repeat(3, 1fr);
}

.photo-caption {
    padding: 14px 18px;
    font-size: 0.85rem;
    color: var(--text-tertiary);
    text-align: center;
    background: white;
    letter-spacing: 1px;
}

/* ===========================
   MingDeWeiXin Section
   =========================== */
#mingde {
    background: var(--bg-primary);
}

.mingde-content {
    display: flex;
    flex-direction: column;
    gap: 60px;
}

.mingde-philosophy {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.mingde-quote {
    font-family: var(--font-serif-cn);
    font-size: clamp(1.05rem, 1.8vw, 1.2rem);
    line-height: 2;
    color: var(--text-primary);
    font-style: normal;
    padding: 36px 48px;
    border-left: 3px solid var(--gold);
    background: var(--accent-bg);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: 28px;
    text-align: left;
}

.mingde-philosophy > p {
    font-size: 1rem;
    line-height: 2;
    color: var(--text-secondary);
}

.mingde-details {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.mingde-card {
    padding: 40px 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    text-align: center;
    transition: all var(--transition-base);
}

.mingde-card:hover {
    background: var(--bg-card-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.mingde-card-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-serif-cn);
    font-size: 1.3rem;
    color: var(--accent);
    border: 1.5px solid var(--accent);
    border-radius: 50%;
}

.mingde-card h3 {
    font-family: var(--font-serif-cn);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 14px;
    letter-spacing: 2px;
}

.mingde-card p {
    font-size: 0.9rem;
    line-height: 1.9;
    color: var(--text-secondary);
    text-align: justify;
}

/* ===========================
   Mission Section
   =========================== */
#mission {
    background: var(--text-primary);
    color: var(--text-inverse);
    text-align: center;
}

.mission-content {
    max-width: 700px;
    margin: 0 auto;
}

.mission-label {
    font-family: var(--font-serif-en);
    font-size: 0.85rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 12px;
}

.mission-title {
    font-family: var(--font-serif-cn);
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    font-weight: 600;
    letter-spacing: 3px;
    margin-bottom: 32px;
}

.mission-divider {
    width: 60px;
    height: 1px;
    background: var(--gold);
    margin: 0 auto 40px;
}

.mission-text {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.mission-highlight {
    font-size: clamp(1.05rem, 1.8vw, 1.25rem);
    line-height: 2;
    color: rgba(250, 248, 244, 0.85);
    letter-spacing: 1px;
}

/* ===========================
   Footer
   =========================== */
#footer {
    background: #1A1714;
    padding: 48px 40px;
}

.footer-container {
    max-width: var(--container-max);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-name {
    font-family: var(--font-serif-en);
    font-size: 1rem;
    color: rgba(250, 248, 244, 0.7);
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.footer-tagline {
    font-size: 0.8rem;
    color: rgba(250, 248, 244, 0.4);
    letter-spacing: 2px;
}

.footer-copyright p {
    font-size: 0.8rem;
    color: rgba(250, 248, 244, 0.3);
    font-family: var(--font-sans);
}

/* ===========================
   Lightbox
   =========================== */
.lightbox {
    display: flex;
    visibility: hidden;
    pointer-events: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2000;
    background: rgba(0, 0, 0, 0.92);
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.lightbox.active {
    visibility: visible;
    pointer-events: auto;
    opacity: 1;
}

.lightbox-close {
    position: absolute;
    top: 24px;
    right: 32px;
    background: none;
    border: none;
    color: white;
    font-size: 2.5rem;
    cursor: pointer;
    opacity: 0.6;
    transition: opacity var(--transition-base);
    z-index: 2001;
    line-height: 1;
}

.lightbox-close:hover {
    opacity: 1;
}

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

.lightbox-content img {
    max-width: 100%;
    max-height: 85vh;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

/* ===========================
   Animations
   =========================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounceDown {
    0%, 100% {
        transform: rotate(45deg) translateY(0);
    }
    50% {
        transform: rotate(45deg) translateY(6px);
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 1024px) {
    :root {
        --section-padding: 100px;
    }

    .photo-grid--bottom {
        grid-template-columns: repeat(4, 1fr);
    }

    .mingde-details {
        grid-template-columns: repeat(2, 1fr);
    }

    .mingde-details .mingde-card:last-child {
        grid-column: span 2;
        max-width: 50%;
        margin: 0 auto;
    }

    .group-photo-grid--3col {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 80px;
    }

    .nav-container {
        padding: 0 24px;
    }

    .nav-links {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    #hero {
        padding: 100px 24px 60px;
    }

    .hero-inner {
        flex-direction: column;
        gap: 40px;
    }

    .hero-photo {
        flex: none;
        max-width: 70%;
        margin: 0 auto;
    }

    .hero-name {
        align-items: center;
    }

    .hero-tagline {
        text-align: center;
    }

    .hero-divider {
        margin: 0 auto 24px;
    }

    .hero-subtitle {
        text-align: center;
    }

    .hero-titles {
        display: flex;
        justify-content: center;
    }

    .section-container {
        padding-left: 24px;
        padding-right: 24px;
    }

    .section-header {
        margin-bottom: 48px;
    }

    .photo-grid--bottom {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }

    .photo-item img {
        height: 160px;
    }

    .about-credentials {
        grid-template-columns: 1fr;
        padding: 24px;
    }

    .mingde-details {
        grid-template-columns: 1fr;
    }

    .mingde-details .mingde-card:last-child {
        grid-column: span 1;
        max-width: 100%;
    }

    .mingde-quote {
        padding: 24px;
    }

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

    .group-photo-grid--3col {
        grid-template-columns: repeat(2, 1fr);
    }

    .group-photo-item img {
        height: 240px;
    }

    .hero-titles {
        display: none;
    }

    .hero-tagline {
        letter-spacing: 4px;
    }

    .footer-container {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    :root {
        --section-padding: 60px;
    }

    .section-container {
        padding-left: 20px;
        padding-right: 20px;
    }

    .photo-grid--bottom {
        grid-template-columns: repeat(2, 1fr);
    }

    .photo-item img {
        height: 130px;
    }

    .group-photo-grid--3col {
        grid-template-columns: 1fr;
    }

    .mingde-card {
        padding: 28px 24px;
    }

    .timeline-content h4 {
        font-size: 1rem;
    }
}