/* =========================================
   CSS Reset & Base Variables
   Chinese Ink Wash (水墨) Dark Theme
   ========================================= */
   :root {
    /* Color Palette - Ink Wash Monochrome */
    --bg-base: #0a0a0a;
    --bg-surface: #141414;
    --bg-card: rgba(255, 255, 255, 0.02);
    
    --text-primary: #e8e0d4; /* Warm parchment white */
    --text-secondary: #8a817a; /* Aged ink grey */
    
    /* Ink accent colors - muted, traditional */
    --accent-ink: #b8a89a; /* Warm beige/tan */
    --accent-mist: #6b7b8d; /* Misty blue-grey */
    --gradient-accent: linear-gradient(135deg, var(--accent-mist), var(--accent-ink));

    /* Typography */
    --font-main: 'Inter', sans-serif;
    
    /* Spacing & Layout */
    --container-width: 1100px;
    --radius-md: 8px;
    --radius-lg: 16px;
    
    /* Transitions */
    --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
    /* Subtle paper texture overlay */
    background-image: 
        radial-gradient(ellipse at 20% 50%, rgba(100, 100, 100, 0.04) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(100, 100, 100, 0.03) 0%, transparent 50%);
}

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

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* =========================================
   Typography & Utilities
   ========================================= */
.gradient-text {
    background: linear-gradient(135deg, #d4c5b0, #f0e6d6, #c4b5a0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
    filter: drop-shadow(0 0 20px rgba(200, 180, 150, 0.15));
}

.section {
    padding: 100px 0;
    position: relative;
}

/* Ink wash divider between sections */
.section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent, 
        rgba(184, 168, 154, 0.2) 20%, 
        rgba(184, 168, 154, 0.3) 50%, 
        rgba(184, 168, 154, 0.2) 80%, 
        transparent);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: 3rem;
    position: relative;
    display: inline-block;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 40px;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-ink), transparent);
    border-radius: 1px;
}

.text-center {
    text-align: center;
}
.text-center.section-title::after {
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    background: linear-gradient(90deg, transparent, var(--accent-ink), transparent);
}

/* =========================================
   Buttons - Ink Wash Style
   ========================================= */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: 2px;
    font-weight: 400;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: none;
    outline: none;
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

.btn-primary {
    background: linear-gradient(135deg, rgba(184, 168, 154, 0.15), rgba(107, 123, 141, 0.15));
    color: var(--text-primary);
    border: 1px solid rgba(184, 168, 154, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    background: linear-gradient(135deg, rgba(184, 168, 154, 0.25), rgba(107, 123, 141, 0.25));
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
    border-color: rgba(184, 168, 154, 0.5);
}

.btn-outline {
    background: transparent;
    border: 1px solid rgba(184, 168, 154, 0.2);
    color: var(--text-secondary);
}

.btn-outline:hover {
    border-color: rgba(184, 168, 154, 0.4);
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.02);
}

.btn-primary-small {
    background: rgba(184, 168, 154, 0.1);
    color: var(--accent-ink);
    padding: 0.5rem 1.2rem;
    border-radius: 2px;
    font-weight: 500;
    border: 1px solid rgba(184, 168, 154, 0.2);
    letter-spacing: 1px;
    text-transform: uppercase;
    font-size: 0.8rem;
}
.btn-primary-small:hover {
    background: rgba(184, 168, 154, 0.2);
    border-color: rgba(184, 168, 154, 0.4);
}

/* =========================================
   Navbar - Minimal Ink Style
   ========================================= */
#navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 1.5rem 0;
    transition: var(--transition-smooth);
    background: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(184, 168, 154, 0.06);
}

#navbar.scrolled {
    padding: 1rem 0;
    box-shadow: 0 10px 40px rgba(0,0,0,0.6);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 300;
    font-size: 1.3rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent-ink);
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2.5rem;
    align-items: center;
}

.nav-links a:not(.btn-primary-small) {
    font-weight: 400;
    color: var(--text-secondary);
    font-size: 0.85rem;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.nav-links a:not(.btn-primary-small):hover {
    color: var(--text-primary);
}

/* =========================================
   Hero Section - Ink Wash Mist
   ========================================= */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

#hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: 
        radial-gradient(ellipse at 30% 40%, rgba(80, 70, 60, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 60%, rgba(60, 70, 80, 0.06) 0%, transparent 50%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 800px;
}

.hero-title {
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 200;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: 2px;
}

.hero-subtitle {
    font-size: clamp(1rem, 3vw, 1.2rem);
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 600px;
    font-weight: 300;
    letter-spacing: 1px;
}

.hero-cta {
    display: flex;
    gap: 1rem;
}

/* Decorative Ink Mist Glows */
.glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    z-index: 1;
    opacity: 0.3;
}

.glow-1 {
    top: -15%;
    right: -10%;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(60, 55, 50, 0.4), transparent 70%);
    opacity: 0.3;
}

.glow-2 {
    bottom: -25%;
    left: -15%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(50, 60, 70, 0.3), transparent 70%);
    opacity: 0.25;
}

/* Ink Wash Figure - Hero */
.hero-ink-figure {
    position: absolute;
    right: -5%;
    bottom: 0;
    width: 55%;
    max-width: 700px;
    z-index: 4;
    pointer-events: none;
    opacity: 0.25;
    mask-image: linear-gradient(to top, transparent 0%, black 20%, black 70%, transparent 100%);
    -webkit-mask-image: linear-gradient(to top, transparent 0%, black 20%, black 70%, transparent 100%);
    filter: grayscale(0.3) contrast(1.1);
}

.hero-ink-figure img {
    width: 100%;
    height: auto;
    display: block;
}

/* Ink Figure - About Section */
.about-ink-art {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.ink-figure-img {
    width: 100%;
    max-height: 300px;
    object-fit: cover;
    object-position: top;
    border-radius: var(--radius-md);
    border: 1px solid rgba(184, 168, 154, 0.08);
    filter: grayscale(0.2) contrast(1.05);
    transition: var(--transition-smooth);
    opacity: 0.85;
}

.ink-figure-img:hover {
    opacity: 1;
    filter: grayscale(0) contrast(1.1);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    transform: scale(1.02);
}

/* Ink Background - Section Decoration */
.ink-section-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.ink-bg-img {
    position: absolute;
    right: -10%;
    top: 50%;
    transform: translateY(-50%);
    width: 40%;
    max-width: 500px;
    opacity: 0.08;
    filter: grayscale(1) contrast(1.2);
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

#education {
    position: relative;
}

#education .container {
    position: relative;
    z-index: 1;
}

/* Floating ink particles animation */
@keyframes floatParticle {
    0%, 100% { transform: translateY(0) translateX(0); opacity: 0; }
    10% { opacity: 0.4; }
    90% { opacity: 0.4; }
    50% { transform: translateY(-100px) translateX(30px); }
}

@keyframes inkDrift {
    0% { transform: translateY(0) rotate(0deg); opacity: 0.1; }
    50% { opacity: 0.3; }
    100% { transform: translateY(-200px) rotate(180deg); opacity: 0; }
}

#hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 200px;
    background: linear-gradient(to top, var(--bg-base), transparent);
    z-index: 2;
    pointer-events: none;
}

/* =========================================
   About Section
   ========================================= */
.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    align-items: center;
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.about-text p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
    font-weight: 300;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.stat-card {
    background: rgba(20, 20, 20, 0.6);
    padding: 2rem;
    border-radius: var(--radius-md);
    border: 1px solid rgba(184, 168, 154, 0.08);
    text-align: center;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

/* Ink brush stroke accent on cards */
.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(184, 168, 154, 0.2), transparent);
}

.stat-card:hover {
    transform: translateY(-5px);
    border-color: rgba(184, 168, 154, 0.15);
    box-shadow: 0 15px 40px rgba(0,0,0,0.3);
}

.stat-card h3 {
    font-size: 2.5rem;
    font-weight: 200;
    color: var(--accent-ink);
    margin-bottom: 0.5rem;
    letter-spacing: 1px;
}

.stat-card p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

/* =========================================
   Experience Timeline - Ink Scroll Style
   ========================================= */
.timeline {
    position: relative;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(to bottom, 
        transparent, 
        rgba(184, 168, 154, 0.3) 20%, 
        rgba(184, 168, 154, 0.3) 80%, 
        transparent);
}

.timeline-item {
    position: relative;
    margin-bottom: 2.5rem;
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.timeline-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    background: var(--bg-base);
    border: 1px solid rgba(184, 168, 154, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    position: relative;
    z-index: 2;
    margin-left: -40px;
}

.timeline-content {
    background: rgba(20, 20, 20, 0.6);
    padding: 1.8rem 2rem;
    border-radius: var(--radius-md);
    border: 1px solid rgba(184, 168, 154, 0.06);
    flex: 1;
    transition: var(--transition-smooth);
}

.timeline-content:hover {
    border-color: rgba(184, 168, 154, 0.15);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    transform: translateY(-3px);
}

.timeline-content h3 {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 0.3rem;
    letter-spacing: 0.5px;
}

.timeline-company {
    color: var(--accent-ink);
    font-weight: 400;
    font-size: 0.95rem;
    margin-bottom: 0.8rem;
    letter-spacing: 0.5px;
}

.timeline-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
    font-weight: 300;
}

/* =========================================
   Education Section
   ========================================= */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.edu-card {
    background: rgba(20, 20, 20, 0.6);
    padding: 2.5rem 2rem;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(184, 168, 154, 0.06);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

/* Ink brush accent */
.edu-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(184, 168, 154, 0.15), transparent);
}

.edu-card:hover {
    transform: translateY(-5px);
    border-color: rgba(184, 168, 154, 0.12);
    box-shadow: 0 15px 35px rgba(0,0,0,0.3);
}

.edu-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    filter: grayscale(0.5);
}

.edu-header {
    margin-bottom: 1rem;
}

.edu-header h3 {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 0.3rem;
    letter-spacing: 0.5px;
}

.edu-date {
    color: var(--accent-ink);
    font-size: 0.85rem;
    font-weight: 400;
    letter-spacing: 0.5px;
}

.edu-degree {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 400;
    margin-bottom: 0.5rem;
}

.edu-note {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.6;
    margin-bottom: 1rem;
    font-weight: 300;
}

.grade-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.chip {
    padding: 0.3rem 0.8rem;
    border-radius: 2px;
    font-size: 0.75rem;
    font-weight: 500;
    border: 1px solid;
    letter-spacing: 0.5px;
}

.chip-star {
    background: rgba(184, 168, 154, 0.1);
    color: var(--accent-ink);
    border-color: rgba(184, 168, 154, 0.2);
}

.chip-a {
    background: rgba(107, 123, 141, 0.1);
    color: var(--accent-mist);
    border-color: rgba(107, 123, 141, 0.2);
}

.chip-b {
    background: rgba(100, 100, 100, 0.1);
    color: #888;
    border-color: rgba(100, 100, 100, 0.2);
}

/* =========================================
   Achievement Cards - Ink Seal Style
   ========================================= */
.stat-emoji {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    filter: grayscale(0.5);
}

.stat-label {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 0.3rem;
    letter-spacing: 0.5px;
}

.stat-sub {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
    font-weight: 300;
}

/* =========================================
   Projects & Achievements - Scroll Style
   ========================================= */
.achievement-category {
    margin-bottom: 2.5rem;
}

.category-title {
    font-size: 1.3rem;
    font-weight: 400;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid rgba(184, 168, 154, 0.08);
    letter-spacing: 1px;
}

.achievement-list {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.achievement-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    background: rgba(20, 20, 20, 0.5);
    padding: 1.1rem 1.4rem;
    border-radius: var(--radius-md);
    border: 1px solid rgba(184, 168, 154, 0.05);
    transition: var(--transition-smooth);
}

.achievement-item:hover {
    border-color: rgba(184, 168, 154, 0.12);
    transform: translateX(5px);
    box-shadow: 0 5px 25px rgba(0,0,0,0.2);
}

.achievement-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    flex: 1;
    font-weight: 300;
}

.achievement-badge {
    flex-shrink: 0;
    padding: 0.2rem 0.6rem;
    border-radius: 2px;
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-top: 2px;
}

/* Monochrome ink seal badge colors */
.badge-gold {
    background: rgba(184, 168, 154, 0.12);
    color: var(--accent-ink);
    border: 1px solid rgba(184, 168, 154, 0.25);
}

.badge-silver {
    background: rgba(107, 123, 141, 0.1);
    color: var(--accent-mist);
    border: 1px solid rgba(107, 123, 141, 0.2);
}

.badge-bronze {
    background: rgba(100, 90, 80, 0.1);
    color: #8a7e72;
    border: 1px solid rgba(100, 90, 80, 0.2);
}

.badge-project {
    background: rgba(107, 123, 141, 0.1);
    color: var(--accent-mist);
    border: 1px solid rgba(107, 123, 141, 0.2);
}

/* =========================================
   Contact & Footer - Ink Wash
   ========================================= */
.contact-container {
    max-width: 650px;
}

.contact-text {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 2.5rem;
    font-weight: 300;
    line-height: 1.8;
}

.contact-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.8rem;
    margin-bottom: 2.5rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    background: rgba(20, 20, 20, 0.6);
    padding: 1rem 1.3rem;
    border-radius: var(--radius-md);
    border: 1px solid rgba(184, 168, 154, 0.06);
    transition: var(--transition-smooth);
}

.contact-item:hover {
    border-color: rgba(184, 168, 154, 0.15);
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
}

.contact-icon {
    font-size: 1.2rem;
    flex-shrink: 0;
    filter: grayscale(0.5);
}

.contact-item p,
.contact-item a {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 300;
}

.contact-item a:hover {
    color: var(--accent-ink);
}

.contact-cta {
    text-align: center;
}

.btn-large {
    padding: 1rem 3rem;
    font-size: 0.95rem;
}

footer {
    padding: 2rem 0;
    text-align: center;
    color: var(--text-secondary);
    border-top: 1px solid rgba(184, 168, 154, 0.06);
    font-size: 0.85rem;
    font-weight: 300;
    letter-spacing: 1px;
}

/* =========================================
   Animations - Smooth Ink Reveal
   ========================================= */
.animate-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 1s ease, transform 1s ease;
}

.animate-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { transition-delay: 0.2s; }
.delay-2 { transition-delay: 0.4s; }
.delay-3 { transition-delay: 0.6s; }

/* =========================================
   Ink Particle Effects
   ========================================= */
@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); opacity: 0.3; }
    50% { transform: translateY(-20px) rotate(5deg); opacity: 0.6; }
}

/* Responsive tweaks */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .about-grid { grid-template-columns: 1fr; }
    .hero-cta { flex-direction: column; }
    .btn { text-align: center; }
    .education-grid { grid-template-columns: 1fr; }
    .timeline { padding-left: 30px; }
    .timeline-icon { margin-left: -30px; width: 36px; height: 36px; }
    .contact-details { grid-template-columns: 1fr; }
}