/* 
   Pham Ngoc The Huy - Subsite Stylesheet
   Aesthetic: "Dynamic Equilibrium & Precision Control" - Industrial Cyberpunk, Amber & Gold accents, dark-themed dashboard
*/

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800;900&family=Share+Tech+Mono&display=swap');

:root {
    --bg-main: #08070d;        /* Deep obsidian space */
    --bg-sec: #0f0d1a;         /* Deeper charcoal slate for offsets */
    --bg-card: #151226;        /* Glassmorphic card fill */
    --border-color: rgba(245, 158, 11, 0.12); /* Amber-infused borders */
    --border-hover: #f59e0b;   /* Neon Electric Amber */
    --text-primary: #f8fafc;   /* Faint icy slate white */
    --text-secondary: #cbd5e1; /* Cool slate grey */
    --text-muted: #64748b;     /* Muted grey */
    --accent-amber: #f59e0b;    /* Core Amber Orange */
    --accent-orange: #ea580c;   /* Darker industrial orange */
    --accent-glow: rgba(245, 158, 11, 0.25);
    --nav-height: 80px;
    --font-outfit: 'Outfit', sans-serif;
    --font-inter: 'Inter', sans-serif;
    --font-mono: 'Share Tech Mono', monospace;
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-inter);
    line-height: 1.7;
    overflow-x: hidden;
    /* Electric industrial micro-grid background */
    background-image: linear-gradient(rgba(245, 158, 11, 0.02) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(245, 158, 11, 0.02) 1px, transparent 1px);
    background-size: 30px 30px;
}

/* Header & Navigation */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background: rgba(8, 7, 13, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    padding: 0 40px;
}

.logo {
    margin-right: auto;
    font-family: var(--font-outfit);
    font-size: 24px;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo span {
    color: var(--accent-amber);
}

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

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 600;
    font-family: var(--font-outfit);
    transition: all 0.25s ease;
    position: relative;
    padding: 8px 0;
}

nav a:hover, nav a.active {
    color: var(--accent-amber);
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-amber);
    transition: width 0.25s ease;
}

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

.back-lab-btn {
    background: rgba(245, 158, 11, 0.08);
    color: var(--accent-amber) !important;
    padding: 8px 18px !important;
    border-radius: 6px;
    font-size: 14px !important;
    transition: all 0.25s ease !important;
    border: 1px solid var(--border-color);
}

.back-lab-btn:hover {
    background: var(--accent-amber);
    color: var(--bg-main) !important;
    box-shadow: 0 0 15px var(--accent-glow);
}

.back-lab-btn::after {
    display: none !important;
}

/* Page Layout */
main {
    max-width: 1200px;
    margin: 120px auto 60px;
    padding: 0 40px;
}

/* Hero Section */
.hero {
    display: flex;
    align-items: center;
    gap: 60px;
    padding: 80px 0;
    margin-bottom: 60px;
    border-bottom: 1px solid var(--border-color);
}

.hero-content {
    flex: 1.2;
}

.hero-tag {
    font-family: var(--font-outfit);
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2.5px;
    color: var(--accent-amber);
    margin-bottom: 16px;
}

.hero-title {
    font-family: var(--font-outfit);
    font-size: 56px;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.hero-title span {
    background: linear-gradient(135deg, var(--text-primary), var(--accent-amber));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-bio {
    font-size: 17px;
    color: var(--text-secondary);
    margin-bottom: 36px;
}

.hero-btn-group {
    display: flex;
    gap: 16px;
}

.btn-primary {
    background: var(--accent-amber);
    color: var(--bg-main);
    font-family: var(--font-outfit);
    font-weight: 700;
    font-size: 15px;
    padding: 12px 28px;
    border-radius: 8px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.15);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(245, 158, 11, 0.35);
    background: #fbbf24;
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    font-family: var(--font-outfit);
    font-weight: 600;
    font-size: 15px;
    padding: 12px 28px;
    border-radius: 8px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.03);
    border-color: var(--border-hover);
    color: var(--accent-amber);
}

.hero-img-box {
    flex: 0.8;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-img-card {
    position: relative;
    width: 320px;
    height: 320px;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    background: var(--bg-sec);
}

.hero-img-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 16px;
    padding: 2px;
    background: linear-gradient(135deg, var(--accent-amber), transparent 50%, var(--accent-orange));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

.hero-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

/* Sections Common */
section {
    padding: 60px 0;
    border-bottom: 1px solid rgba(245, 158, 11, 0.08);
}

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

.section-tag {
    font-family: var(--font-outfit);
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent-amber);
    margin-bottom: 12px;
}

.section-title {
    font-family: var(--font-outfit);
    font-size: 38px;
    font-weight: 800;
    letter-spacing: -0.5px;
}

/* Interactive Simulator Section */
.simulator-container {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 40px;
    margin-top: 30px;
}

.canvas-wrapper {
    background: #040307;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 0 30px rgba(0,0,0,0.8);
    height: 480px;
}

.canvas-wrapper canvas {
    display: block;
    width: 100%;
    height: 100%;
}

.simulator-controls {
    background: var(--bg-sec);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.ctrl-panel-title {
    font-family: var(--font-outfit);
    font-size: 18px;
    font-weight: 700;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.slider-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.slider-header {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    font-weight: 600;
    font-family: var(--font-outfit);
}

.slider-header span:last-child {
    font-family: var(--font-mono);
    color: var(--accent-amber);
}

.custom-range {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.08);
    outline: none;
    transition: background 0.3s;
}

.custom-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-amber);
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-glow);
    transition: transform 0.1s, background-color 0.2s;
}

.custom-range::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    background: #fbbf24;
}

.sim-btn-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 10px;
}

.btn-sim {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px;
    border-radius: 6px;
    font-size: 13px;
    font-family: var(--font-outfit);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-sim:hover {
    border-color: var(--border-hover);
    color: var(--accent-amber);
    background: rgba(245, 158, 11, 0.05);
}

.btn-sim.active {
    background: var(--accent-amber);
    color: var(--bg-main);
    border-color: var(--accent-amber);
    box-shadow: 0 0 10px var(--accent-glow);
}

/* Oscilloscope Chart */
.telemetry-dashboard {
    margin-top: 24px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.telemetry-card {
    background: rgba(21, 18, 38, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.telemetry-lbl {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    font-weight: bold;
}

.telemetry-val {
    font-family: var(--font-mono);
    font-size: 20px;
    color: var(--text-primary);
}

/* Grid & Cards layout */
.grid-2 {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 60px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.card-thin {
    background: var(--bg-sec);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.card-thin:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(245, 158, 11, 0.08);
}

.card-icon {
    font-size: 32px;
    color: var(--accent-amber);
    margin-bottom: 20px;
}

.card-title {
    font-family: var(--font-outfit);
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
}

.card-thin p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Projects Showcase */
.project-card {
    background: var(--bg-sec);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-6px);
    box-shadow: 0 16px 36px rgba(245, 158, 11, 0.1);
}

.project-body {
    padding: 30px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-tag {
    font-family: var(--font-mono);
    font-size: 12px;
    text-transform: uppercase;
    color: var(--accent-amber);
    letter-spacing: 1px;
    margin-bottom: 10px;
}

.project-desc {
    color: var(--text-secondary);
    font-size: 14.5px;
    margin-bottom: 24px;
    flex-grow: 1;
}

.project-specs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: auto;
}

.spec-badge {
    background: rgba(245, 158, 11, 0.06);
    border: 1px solid rgba(245, 158, 11, 0.15);
    color: var(--text-secondary);
    font-size: 11px;
    padding: 3px 10px;
    border-radius: 20px;
    font-family: var(--font-mono);
}

/* Timeline Components */
.timeline {
    position: relative;
    padding-left: 32px;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 5px;
    left: 7px;
    width: 2px;
    height: 95%;
    background-color: var(--border-color);
}

.timeline-item {
    position: relative;
    margin-bottom: 40px;
}

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

.timeline-item::before {
    content: '';
    position: absolute;
    top: 6px;
    left: -32px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--bg-main);
    border: 3px solid var(--accent-amber);
    box-shadow: 0 0 8px var(--accent-glow);
    z-index: 1;
}

.timeline-year {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--accent-amber);
    font-weight: 600;
    margin-bottom: 4px;
}

.timeline-title {
    font-family: var(--font-outfit);
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

.timeline-institution {
    font-size: 13.5px;
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 8px;
}

.timeline-desc {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Skills Badges and Lists */
.skill-category {
    margin-top: 18px;
}

.skill-cat-title {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    font-weight: bold;
    margin-bottom: 10px;
}

.skill-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-badge {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-family: var(--font-outfit);
    font-size: 13px;
    font-weight: 600;
    padding: 6px 14px;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.skill-badge:hover {
    border-color: var(--border-hover);
    color: var(--accent-amber);
    background: rgba(245, 158, 11, 0.05);
}

/* Contact Grid */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-card-box {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--bg-sec);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 20px;
    transition: all 0.25s ease;
}

.contact-card-box:hover {
    border-color: var(--border-hover);
    box-shadow: 0 8px 24px rgba(245, 158, 11, 0.06);
}

.contact-card-icon {
    font-size: 24px;
    color: var(--accent-amber);
    width: 50px;
    height: 50px;
    background: rgba(245, 158, 11, 0.05);
    border: 1px solid rgba(245, 158, 11, 0.1);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-card-title {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    font-weight: bold;
}

.contact-card-val {
    font-family: var(--font-outfit);
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.contact-card-val a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s;
}

.contact-card-val a:hover {
    color: var(--accent-amber);
}

/* Footer style */
footer {
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
    text-align: center;
    font-size: 13.5px;
    color: var(--text-muted);
    margin-top: 80px;
}

/* MOBILE RESPONSIVENESS OVERRIDES */
@media (max-width: 992px) {
    .simulator-container {
        grid-template-columns: 1fr;
    }
    
    .grid-2 {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    header .nav-container {
        padding: 0 20px;
        flex-direction: column;
        justify-content: center;
        height: auto;
        padding-top: 15px;
        padding-bottom: 15px;
    }
    
    .logo {
        margin-right: 0;
        margin-bottom: 10px;
    }
    
    nav {
        gap: 16px;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    main {
        margin-top: 160px;
        padding: 0 20px;
    }
    
    .hero {
        flex-direction: column;
        text-align: center;
        padding: 40px 0;
    }
    
    .hero-btn-group {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .hero-img-box {
        order: -1;
    }
    
    .hero-title {
        font-size: 38px;
    }
    
    .grid-3 {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 0;
    }
    
    .telemetry-dashboard {
        grid-template-columns: 1fr;
    }
}