/* ===== Variables (Morandi Grey Theme) ===== */
:root {
    --bg-primary: #242629;       /* Deep desaturated charcoal grey (Morandi) */
    --bg-secondary: #2b2d31;     /* Slightly lighter grey section background */
    --bg-card: #32353a;          /* Soft slate-grey card background */
    --border-color: #3f434a;     /* Soft grey border */
    
    --accent-primary: #9ca3af;   /* Muted desaturated silver grey */
    --accent-hover: #b9c1cc;     /* Light warm grey on hover */
    --accent-glow: rgba(156, 163, 175, 0.15);
    
    --text-primary: #e5e7eb;     /* Off-white light grey for main headings */
    --text-secondary: #cbd5e1;   /* Desaturated silver-grey for body text */
    --text-muted: #8a93a1;       /* Low-contrast grey for captions */
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    
    --font-sans: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --font-serif: 'Lora', Georgia, serif;
    
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.25), 0 1px 3px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px; /* Offset for sticky navbar */
}

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

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

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

ul {
    list-style: none;
}

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

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-sm);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}

/* ===== Layout Containers ===== */
.section {
    padding: 100px 24px;
}

.section:nth-child(even) {
    background-color: var(--bg-secondary);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
}

.section-title {
    font-family: var(--font-serif);
    font-size: 2.25rem;
    color: var(--text-primary);
    margin-bottom: 50px;
    position: relative;
    display: inline-block;
    letter-spacing: 2px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 3px;
    background-color: var(--accent-primary);
    border-radius: 2px;
}

/* ===== Sticky Navbar ===== */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 80px;
    background-color: rgba(36, 38, 41, 0.85); /* Semitransparent */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

#navbar.nav-scrolled {
    height: 70px;
    box-shadow: var(--shadow);
}

.nav-container {
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
    padding: 6px 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-primary);
    transition: var(--transition);
}

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

.nav-links a.active {
    color: var(--text-primary);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* Language Toggle Button */
.lang-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.8rem;
    letter-spacing: 1px;
    transition: var(--transition);
}

.lang-btn:hover {
    background-color: var(--bg-card);
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

/* Mobile Hamburger Menu */
.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1010;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    margin: 5px 0;
    transition: var(--transition);
}

/* ===== Hero Section ===== */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 120px; /* Offset for nav */
}

.hero-layout {
    display: flex;
    align-items: center;
    gap: 64px;
}

.hero-avatar-area {
    flex-shrink: 0;
    width: 168px;
    height: 168px;
    border-radius: 50%;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Glow effect border around avatar */
.avatar-border {
    position: absolute;
    inset: -6px;
    border-radius: 50%;
    border: 2px solid var(--accent-primary);
    opacity: 0.6;
    animation: pulse 3s infinite alternate;
}

.hero-photo-wrap {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: var(--bg-card);
    overflow: hidden;
    position: relative;
    border: 3px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Fallback Monogram initials logo */
.hero-photo-wrap::before {
    content: 'JH';
    font-family: var(--font-serif);
    font-size: 2.75rem;
    font-weight: 700;
    color: var(--accent-primary);
    position: absolute;
    letter-spacing: 2px;
    z-index: 1;
}

.hero-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: absolute;
    z-index: 2;
    transition: var(--transition);
}

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

.hero-info {
    flex: 1;
}

.hero-greeting {
    font-family: var(--font-mono);
    color: var(--accent-primary);
    font-size: 1rem;
    letter-spacing: 2px;
    margin-bottom: 12px;
    display: block;
}

.hero-name {
    font-size: clamp(1.6rem, 3.2vw, 2.4rem);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.hero-subtitle {
    font-size: 1.35rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.hero-intro {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    max-width: 650px;
}

.hero-socials {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 35px;
}

.social-link {
    display: flex;
    align-items: center;
    gap: 8px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 30px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.social-link:hover {
    border-color: var(--accent-primary);
    background-color: var(--border-color);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--accent-glow);
}

.social-link svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 40px;
}

.hero-tag {
    background-color: rgba(141, 164, 190, 0.1);
    border: 1px solid rgba(141, 164, 190, 0.2);
    color: var(--accent-primary);
    padding: 6px 14px;
    border-radius: 4px;
    font-size: 0.85rem;
    font-family: var(--font-mono);
}

.hero-actions {
    display: flex;
    gap: 20px;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--accent-hover);
    color: var(--bg-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(141, 164, 190, 0.4);
}

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

.btn-secondary:hover {
    background-color: rgba(141, 164, 190, 0.1);
    transform: translateY(-2px);
}

/* ===== About Section ===== */
.about-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 48px;
    align-items: start;
}

.about-text p {
    margin-bottom: 20px;
    font-size: 1.05rem;
    text-align: justify;
}

.highlight-box {
    background-color: var(--bg-card);
    border-left: 4px solid var(--accent-primary);
    padding: 24px;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    box-shadow: var(--shadow);
}

.highlight-box h4 {
    font-size: 1.15rem;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.highlight-box p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 0;
    line-height: 1.7;
}

/* ===== Skills Section ===== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}

.skill-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 30px;
    transition: var(--transition);
}

.skill-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow);
}

.skill-icon-wrap {
    color: var(--accent-primary);
    margin-bottom: 20px;
}

.skill-icon-wrap svg {
    width: 36px;
    height: 36px;
    fill: currentColor;
}

.skill-card h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 16px;
    font-weight: 600;
}

.skill-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.skill-item {
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.skill-item::before {
    content: "•";
    color: var(--accent-primary);
    font-size: 1.2rem;
}

/* ===== Experience Timeline ===== */
.timeline {
    position: relative;
    max-width: 860px;
    margin: 0 auto;
    padding: 20px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 31px;
    top: 0;
    height: 100%;
    width: 2px;
    background-color: var(--border-color);
}

.timeline-item {
    position: relative;
    padding-left: 80px;
    margin-bottom: 50px;
}

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

.timeline-dot {
    position: absolute;
    left: 20px;
    top: 6px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--bg-primary);
    border: 4px solid var(--accent-primary);
    z-index: 2;
    transition: var(--transition);
}

.timeline-item:hover .timeline-dot {
    background-color: var(--accent-primary);
    box-shadow: 0 0 0 6px var(--accent-glow);
}

.timeline-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 16px;
    gap: 8px;
}

.timeline-title-row {
    display: flex;
    flex-direction: column;
}

.company-name {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
}

.job-role {
    font-size: 1rem;
    color: var(--accent-primary);
    font-weight: 500;
    margin-top: 4px;
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-muted);
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    padding: 4px 12px;
    border-radius: 20px;
}

.timeline-body {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.timeline-item:hover .timeline-body {
    border-color: rgba(141, 164, 190, 0.4);
}

.timeline-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.timeline-list li {
    font-size: 0.95rem;
    position: relative;
    padding-left: 18px;
    text-align: justify;
}

.timeline-list li::before {
    content: "▫";
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

/* ===== Projects & Highlights ===== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.project-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 32px;
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-6px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow);
}

.project-icon {
    color: var(--accent-primary);
    margin-bottom: 20px;
}

.project-icon svg {
    width: 32px;
    height: 32px;
    fill: currentColor;
}

.project-card h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 16px;
    font-weight: 600;
}

.project-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
    flex: 1;
    text-align: justify;
    white-space: pre-line;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 4px 10px;
    border-radius: 4px;
}

/* ===== Education Section ===== */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.edu-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 30px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
    transition: var(--transition);
}

.edu-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow);
}

.edu-icon-wrap {
    color: var(--accent-primary);
    flex-shrink: 0;
}

.edu-icon-wrap svg {
    width: 32px;
    height: 32px;
    fill: currentColor;
}

.edu-details h3 {
    font-size: 1.15rem;
    color: var(--text-primary);
    font-weight: 600;
}

.edu-school {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.edu-date {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ===== Contact Section ===== */
.contact-content-centered {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-subtitle-text {
    font-size: 1.1rem;
    margin-bottom: 40px;
    color: var(--text-secondary);
}

.contact-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    margin-top: 20px;
}

.contact-card-item {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 30px 24px;
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: var(--transition);
    text-decoration: none;
}

.contact-card-item:hover {
    border-color: var(--accent-primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.contact-card-icon {
    color: var(--accent-primary);
    margin-bottom: 16px;
}

.contact-card-icon svg {
    width: 32px;
    height: 32px;
    fill: currentColor;
}

.contact-card-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.contact-card-value {
    font-size: 1.1rem;
    color: var(--text-primary);
    word-break: break-all;
}

/* ===== Footer ===== */
#footer {
    border-top: 1px solid var(--border-color);
    padding: 40px 24px;
    background-color: #1a1c1e;
    text-align: center;
}

.footer-content p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* ===== Keyframes / Animations ===== */
@keyframes pulse {
    0% {
        transform: scale(1);
        opacity: 0.4;
    }
    100% {
        transform: scale(1.03);
        opacity: 0.7;
    }
}

/* ===== Responsive Styles ===== */
@media (max-width: 992px) {
    .hero-layout {
        flex-direction: column;
        text-align: center;
        gap: 40px;
    }
    
    .hero-avatar-area {
        width: 132px;
        height: 132px;
    }
    
    .hero-photo-wrap::before {
        font-size: 2.1rem;
    }
    
    .hero-intro {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-socials, .hero-tags, .hero-actions {
        justify-content: center;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .contact-layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 70px 20px;
    }
    
    .section-title {
        font-size: 1.85rem;
    }
    
    /* Hamburger Menu Triggered */
    .hamburger {
        display: block;
    }
    
    .nav-links {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background-color: var(--bg-primary);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 40px;
        transition: var(--transition);
        z-index: 999;
        border-top: 1px solid var(--border-color);
    }
    
    .nav-links.nav-open {
        left: 0;
    }
    
    .nav-links a {
        font-size: 1.25rem;
    }
    
    .timeline::before {
        left: 17px;
    }
    
    .timeline-item {
        padding-left: 45px;
    }
    
    .timeline-dot {
        left: 6px;
        width: 20px;
        height: 20px;
        border-width: 3px;
    }
    
    .timeline-header {
        flex-direction: column;
        gap: 12px;
    }
    
    .form-group-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
}