:root {
    --color-background: #0d1117;
    --color-surface: #161b22;
    --color-border: #30363d;
    --color-primary: #58a6ff;
    --color-text-primary: #c9d1d9;
    --color-text-secondary: #8b949e;
    --color-success: #3fb950;
    --color-danger: #f85149;
    --font-sans: 'Inter', sans-serif;
    --font-mono: 'Fira Code', monospace;
    --header-height: 70px;
}

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

html { scroll-behavior: smooth; font-size: 10px; }

body {
    background-color: var(--color-background);
    color: var(--color-text-primary);
    font-family: var(--font-sans);
    font-size: 1.6rem;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-weight: 700; line-height: 1.2; }
h1 { font-size: clamp(3.2rem, 5vw, 5rem); }
h2 { font-size: clamp(2.8rem, 4vw, 3.2rem); }
h3 { font-size: 2rem; margin-bottom: 1rem; color: var(--color-text-primary); }

p { color: var(--color-text-secondary); margin-bottom: 1.5rem; max-width: 75ch; }
a { color: var(--color-primary); text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 0.8; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 2rem; }
section { padding: 10rem 0; }

.section-title {
    color: var(--color-text-primary);
    margin-bottom: 4rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--color-border);
}

/* Header */
.main-header {
    position: fixed;
    top: 0; left: 0; width: 100%;
    height: var(--header-height);
    display: flex; justify-content: space-between; align-items: center;
    padding: 0 4rem;
    background-color: rgba(13, 17, 23, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    z-index: 100;
    transition: border-color 0.3s ease;
}
.logo a { font-family: var(--font-mono); font-weight: 700; font-size: 2.2rem; }
.main-nav ul { display: flex; list-style: none; }
.main-nav li { margin: 0 1.5rem; }
.main-nav a { font-size: 1.4rem; font-family: var(--font-mono); }
.mobile-nav-toggle { display: none; }

/* Hero Section */
#hero {
    min-height: 100vh;
    display: flex; align-items: center; text-align: left;
}
.hero-title { font-size: clamp(2rem, 4vw, 2.4rem); color: var(--color-text-primary); font-weight: 500; }
.hero-subtitle { margin: 1rem 0 2rem; font-size: clamp(3.5rem, 6vw, 6rem); color: var(--color-text-primary); }
.hero-description { font-size: 1.8rem; max-width: 60ch; }
.hero-stats { display: flex; gap: 4rem; margin-top: 4rem; }
.stat { display: flex; flex-direction: column; }
.stat-number { font-size: 2.4rem; font-weight: 700; color: var(--color-primary); }
.stat-label { font-size: 1.2rem; text-transform: uppercase; letter-spacing: 1px; color: var(--color-text-secondary); }
.hero-cta-button {
    display: inline-block;
    margin-top: 5rem;
    padding: 1.2rem 2.4rem;
    background-color: var(--color-primary);
    color: var(--color-background);
    border-radius: 6px;
    font-weight: 500;
    transition: transform 0.2s;
}
.hero-cta-button:hover { transform: translateY(-2px); opacity: 1; }

/* Tabs Container */
#experience { background-color: var(--color-surface); }
.tabs-container { border: 1px solid var(--color-border); border-radius: 8px; }
.project-dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1px;
    background-color: var(--color-border);
    border-bottom: 1px solid var(--color-border);
    overflow: hidden;
    border-radius: 8px 8px 0 0;
}
.dashboard-item { background-color: var(--color-surface); padding: 1.5rem; }
.dashboard-label { display: block; font-size: 1.2rem; color: var(--color-text-secondary); margin-bottom: 0.5rem; }
.dashboard-value { font-weight: 500; font-family: var(--font-mono); font-size: 1.4rem; }
.status-complete { color: var(--color-success); }
.tab-list { display: flex; border-bottom: 1px solid var(--color-border); background-color: var(--color-background); flex-wrap: wrap;}
.tab-button {
    padding: 1.5rem 2rem;
    background: none; border: none;
    color: var(--color-text-secondary);
    cursor: pointer; font-size: 1.4rem;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
    font-family: var(--font-sans);
    font-weight: 500;
}
.tab-button:hover { color: var(--color-text-primary); }
.tab-button.active { color: var(--color-text-primary); border-bottom-color: var(--color-primary); }
.tab-button i { margin-right: 0.8rem; }
.tab-content { padding: 3rem; background-color: var(--color-background); border-radius: 0 0 8px 8px; }
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn 0.5s; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* Analysis List */
.analysis-list { list-style: none; margin-top: 2rem; }
.analysis-list li { display: flex; align-items: flex-start; margin-bottom: 1.5rem; }
.analysis-list i { font-size: 1.8rem; margin-right: 1.5rem; color: var(--color-danger); margin-top: 0.3rem;}
.analysis-list span { color: var(--color-text-primary); }

/* Architecture Diagram */
.architecture-diagram {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: space-between;
    gap: 2rem;
    margin-top: 3rem;
    padding: 2rem;
    background-color: var(--color-surface);
    border-radius: 6px;
}
.diagram-stage { flex: 1; min-width: 180px; text-align: center; }
.stage-box {
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    padding: 1.5rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    min-height: 140px;
}
.stage-box i { font-size: 2.4rem; color: var(--color-primary); margin-bottom: 1rem; display: block; }
.stage-desc { font-size: 1.3rem; color: var(--color-text-secondary); }
.arrow { display: flex; align-items: center; height: 140px; font-size: 2.4rem; color: var(--color-text-secondary); }

/* Code & Artifacts Browser */
.file-browser {
    font-family: var(--font-mono);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 2rem;
}
.file-item { padding: 0.5rem 1rem; }
.file-item.sub { padding-left: 3rem; }
.file-item i { margin-right: 1rem; color: var(--color-text-secondary); width: 20px; text-align: center; }
.file-item.folder i { color: var(--color-primary); }
.file-item a { color: var(--color-text-primary); }
.file-item a:hover { text-decoration: underline; }

/* Experience Section Lists */
.job-duration { font-family: var(--font-mono); font-size: 1.4rem; color: var(--color-text-secondary); margin-bottom: 2rem;}
.experience-list { list-style: none; }
.experience-list li { position: relative; padding-left: 2.5rem; margin-bottom: 1.5rem; color: var(--color-text-secondary); }
.experience-list li::before { content: '▹'; position: absolute; left: 0; color: var(--color-primary); font-weight: 700; }

/* Toolkit Section */
#toolkit { background-color: var(--color-surface); }
.toolkit-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
}
.toolkit-category h3 { color: var(--color-primary); padding-bottom: 1rem; border-bottom: 1px solid var(--color-border); margin-bottom: 1.5rem; font-size: 1.6rem;}
.toolkit-category ul { list-style: none; }
.toolkit-category li { margin-bottom: 1rem; color: var(--color-text-secondary); position: relative; padding-left: 2rem; font-size: 1.4rem;}
.toolkit-category li::before { content: '›'; position: absolute; left: 0; color: var(--color-primary); font-weight: 700; }

/* About Section */
.about-container { max-width: 800px; }

/* Contact Section */
#contact { text-align: center; }
.contact-title { font-family: var(--font-mono); color: var(--color-primary); }
#contact h2 { color: var(--color-text-primary); }
.contact-button {
    display: inline-block;
    margin-top: 3rem;
    padding: 1rem 2rem;
    border: 1px solid var(--color-primary);
    border-radius: 6px;
    font-family: var(--font-mono);
}

/* Footer */
.main-footer { padding: 3rem 0; text-align: center; border-top: 1px solid var(--color-border); }
.footer-text { font-size: 1.3rem; color: var(--color-text-secondary); }

/* Responsive */
@media (max-width: 768px) {
    .main-header { padding: 0 2rem; }
    .main-nav { display: none; } /* JS will handle toggle */
    .mobile-nav-toggle { display: block; /* Add hamburger styles */ }
    .hero-stats { gap: 2rem; flex-wrap: wrap; }
    .architecture-diagram { flex-direction: column; align-items: stretch; }
    .arrow { transform: rotate(90deg); height: auto; padding: 1rem 0; justify-content: center; }
}