:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --accent: #00d4ff;
    --accent-hover: #00b0d4;
    --border: #30363d;
    --navbar-bg: rgba(13, 17, 23, 0.9);
    --card-bg: #161b22;
    --vscode-bg: #1e1e1e;
    --vscode-blue: #569cd6;
    --vscode-red: #ce9178;
    --vscode-green: #4ec9b0;
    --vscode-yellow: #dcdcaa;
    --vscode-purple: #c586c0;
    --vscode-comment: #6a9955;
    --term-bg: #0d1117;
    --term-prompt: #4af626;
}

[data-theme="light"] {
    --bg-primary: #f0f2f5;
    --bg-secondary: #ffffff;
    --text-primary: #24292e;
    --text-secondary: #586069;
    --accent: #005cc5;
    --accent-hover: #004491;
    --border: #e1e4e8;
    --navbar-bg: rgba(255, 255, 255, 0.9);
    --card-bg: #ffffff;
}

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

html {
    scroll-behavior: smooth;
    font-family: 'Inter', sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color 0.3s, color 0.3s;
}

body { line-height: 1.6; }

a { color: var(--accent); text-decoration: none; transition: color 0.3s; }
a:hover { color: var(--accent-hover); }

.container { width: 90%; max-width: 1200px; margin: 0 auto; }

.section-pad { padding: 5rem 0; }

.bg-alt { background-color: var(--bg-secondary); }

.section-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    color: var(--text-primary);
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background-color: var(--accent);
    margin: 0.5rem auto 0;
    border-radius: 2px;
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: 4px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
    text-align: center;
}

.btn-primary { background-color: var(--accent); color: #000; }
[data-theme="light"] .btn-primary { color: #fff; }
.btn-primary:hover { background-color: var(--accent-hover); color: #000; }
[data-theme="light"] .btn-primary:hover { color: #fff; }

.btn-secondary {
    background-color: rgba(0,0,0,0.5);
    color: #fff;
    border: 1px solid var(--accent);
    backdrop-filter: blur(5px);
}
.btn-secondary:hover { background-color: var(--accent); color: #000; }
[data-theme="light"] .btn-secondary { background-color: #fff; color: var(--accent); }
[data-theme="light"] .btn-secondary:hover { background-color: var(--accent); color: #fff; }

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--navbar-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    padding: 1rem 0;
    transition: background-color 0.3s, border-color 0.3s;
}

.nav-container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo { font-family: 'JetBrains Mono', monospace; font-size: 1.5rem; font-weight: 800; color: var(--text-primary); }
.logo .accent { color: var(--accent); }

.nav-links { list-style: none; display: flex; gap: 1.5rem; }
.nav-links a { color: var(--text-secondary); font-weight: 600; font-size: 0.9rem; }
.nav-links a:hover, .nav-links a.active { color: var(--accent); }

.nav-controls { display: flex; align-items: center; gap: 1.5rem; }

#theme-toggle { background: none; border: none; color: var(--text-primary); cursor: pointer; display: flex; align-items: center; justify-content: center; }
#theme-toggle .sun-icon { display: none; }
#theme-toggle .moon-icon { display: block; }
[data-theme="light"] #theme-toggle .sun-icon { display: block; }
[data-theme="light"] #theme-toggle .moon-icon { display: none; }

.lang-toggle button {
    background: none;
    border: 1px solid var(--border);
    padding: 2px 8px;
    border-radius: 4px;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.3s;
}
.lang-toggle button:hover { border-color: var(--accent); color: var(--accent); }

.hamburger { display: none; flex-direction: column; gap: 4px; cursor: pointer; }
.hamburger span { display: block; width: 25px; height: 3px; background-color: var(--text-primary); transition: 0.3s; }

/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 80px;
    overflow: hidden;
}

#matrix-bg { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 0; opacity: 0.25; }
[data-theme="light"] #matrix-bg { opacity: 0.05; }

.hero-content {
    position: relative;
    z-index: 10;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-text { background: rgba(13,17,23,0.7); padding: 2rem; border-radius: 8px; backdrop-filter: blur(5px); }
[data-theme="light"] .hero-text { background: rgba(255,255,255,0.7); }
.hero-text h1 { font-size: 3.5rem; margin-bottom: 0.5rem; line-height: 1.1; }
.hero-text h2 { font-size: 1.5rem; color: var(--accent); margin-bottom: 1.5rem; font-weight: 400; }
.tagline { font-size: 1.1rem; color: var(--text-primary); margin-bottom: 2rem; font-style: italic; }
.cta-group { display: flex; gap: 1rem; }

/* Terminal */
.hero-terminal {
    background-color: var(--term-bg);
    border-radius: 8px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.8);
    overflow: hidden;
    font-family: 'JetBrains Mono', monospace;
    color: #fff;
    border: 1px solid #333;
    display: flex;
    flex-direction: column;
    height: 400px;
}

.terminal-header { background-color: #2d2d2d; padding: 10px 15px; display: flex; align-items: center; gap: 8px; border-bottom: 1px solid #111; }
.terminal-title { margin-left: 10px; font-size: 0.8rem; color: #aaa; }
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.red { background-color: #ff5f56; }
.dot.yellow { background-color: #ffbd2e; }
.dot.green { background-color: #27c93f; }
.terminal-body { padding: 15px; flex-grow: 1; overflow-y: auto; font-size: 0.9rem; line-height: 1.4; white-space: pre-wrap; display: flex; flex-direction: column; }
.terminal-input-line { display: flex; padding: 0 15px 15px 15px; font-size: 0.9rem; }
.prompt { color: var(--term-prompt); font-weight: bold; margin-right: 8px; white-space: nowrap; }
#terminal-input { background: transparent; border: none; color: #fff; font-family: 'JetBrains Mono', monospace; font-size: 0.9rem; flex-grow: 1; outline: none; }
.terminal-body::-webkit-scrollbar { width: 8px; }
.terminal-body::-webkit-scrollbar-track { background: var(--term-bg); }
.terminal-body::-webkit-scrollbar-thumb { background: #333; border-radius: 4px; }

/* About */
.about-grid { display: grid; grid-template-columns: 1fr; gap: 2rem; max-width: 800px; margin: 0 auto; text-align: center; font-size: 1.1rem; color: var(--text-secondary); }

/* VSCode Stack */
.stack-vscode-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2rem; }
.vscode-card { background-color: var(--vscode-bg); padding: 1.5rem; border-radius: 8px; border: 1px solid #333; font-family: 'JetBrains Mono', monospace; font-size: 0.9rem; transition: transform 0.3s, box-shadow 0.3s; }
.vscode-card:hover { transform: translateY(-5px); }
.vscode-card.infra { border-top: 3px solid var(--vscode-blue); }
.vscode-card.infra:hover { box-shadow: 0 0 15px rgba(86,156,214,0.3); }
.vscode-card.sec { border-top: 3px solid var(--vscode-red); }
.vscode-card.sec:hover { box-shadow: 0 0 15px rgba(206,145,120,0.3); }
.vscode-card.dev { border-top: 3px solid var(--vscode-yellow); }
.vscode-card.dev:hover { box-shadow: 0 0 15px rgba(220,220,170,0.3); }
.vscode-card.auto { border-top: 3px solid var(--vscode-purple); }
.vscode-card.auto:hover { box-shadow: 0 0 15px rgba(197,134,192,0.3); }
.vscode-comment { color: var(--vscode-comment); margin-bottom: 1rem; }
.vscode-tokens { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.token { padding: 2px 6px; background-color: rgba(255,255,255,0.05); border-radius: 3px; color: #ccc; }
.infra .token { color: var(--vscode-blue); }
.sec .token { color: var(--vscode-red); }
.dev .token { color: var(--vscode-green); }
.auto .token { color: var(--vscode-purple); }

/* Certs */
.certs-grid { display: flex; flex-wrap: wrap; gap: 1.5rem; justify-content: center; }
.cert-item { background-color: var(--card-bg); padding: 1rem 1.5rem; border-radius: 8px; border: 1px solid var(--border); font-weight: 600; transition: border-color 0.3s; display: flex; align-items: center; gap: 10px; }
.cert-item img { height: 24px; width: auto; }
.cert-item:hover { border-color: var(--accent); }
.cert-item.done { border-color: var(--accent); opacity: 1; }
.cert-item.done .cert-check { color: var(--accent); font-weight: 700; margin-right: 6px; font-family: 'JetBrains Mono', monospace; }
.cert-item.wip { opacity: 0.55; }
.cert-item.wip .cert-check { color: #666; margin-right: 6px; font-family: 'JetBrains Mono', monospace; }

.subsection-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.78rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin: 2rem 0 0.8rem;
    padding-left: 2px;
}

/* Services */
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; }
.service-card { background-color: var(--bg-primary); padding: 2.5rem 2rem; border-radius: 8px; border: 1px solid var(--border); text-align: center; transition: transform 0.3s; }
.service-card:hover { transform: translateY(-5px); }
.service-card .icon { margin-bottom: 1.5rem; color: var(--accent); }
.service-card h3 { margin-bottom: 1rem; }
.service-card p { color: var(--text-secondary); font-size: 0.95rem; }

/* Clients */
.clients-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
.client-card { background-color: var(--bg-primary); padding: 2rem; border-radius: 8px; border: 1px solid var(--border); display: flex; flex-direction: column; }
.client-logo { max-height: 60px; object-fit: contain; margin-bottom: 1.5rem; align-self: flex-start; }
.client-card h3 { margin-bottom: 0.5rem; }
.client-card p { color: var(--text-secondary); margin-bottom: 1.5rem; font-size: 0.9rem; flex-grow: 1; }
.client-card a { font-size: 0.9rem; font-family: 'JetBrains Mono', monospace; }

/* Contact */
.contact-wrapper { display: grid; grid-template-columns: 1fr 2fr; gap: 3rem; background-color: var(--card-bg); padding: 3rem; border-radius: 8px; border: 1px solid var(--border); }
.contact-info p { margin-bottom: 1rem; color: var(--text-secondary); }
.form-group { margin-bottom: 1.5rem; }
.form-group label { display: block; margin-bottom: 0.5rem; color: var(--text-primary); font-weight: 600; }
.form-group input, .form-group textarea { width: 100%; padding: 0.8rem; background-color: var(--bg-primary); border: 1px solid var(--border); border-radius: 4px; color: var(--text-primary); font-family: 'Inter', sans-serif; }
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--accent); }
.form-message { margin-top: 1rem; font-weight: 600; }
.form-message.success { color: #27c93f; }
.form-message.error { color: #ff5f56; }

/* Footer */
.footer { text-align: center; padding: 2rem 0; border-top: 1px solid var(--border); color: var(--text-secondary); font-size: 0.9rem; }

/* Animations */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease-out, transform 0.6s ease-out; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* Projects */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.2rem; margin-top: 1rem; }
.project-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: 14px; padding: 1.4rem; transition: border-color 0.3s, transform 0.25s; }
.project-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.project-header { display: flex; align-items: flex-start; gap: 0.8rem; margin-bottom: 0.8rem; }
.project-icon { width: 44px; height: 44px; flex-shrink: 0; border-radius: 10px; background: rgba(0,212,255,0.1); display: flex; align-items: center; justify-content: center; color: var(--accent); }
.project-header h3 { margin: 0 0 4px; font-size: 1.05rem; }
.project-badge { display: inline-block; font-size: 0.68rem; font-family: 'JetBrains Mono', monospace; padding: 2px 8px; border-radius: 4px; background: rgba(255,255,255,0.07); color: #aaa; text-transform: uppercase; letter-spacing: 0.05em; }
.project-badge.active { background: rgba(0,200,100,0.15); color: #00c864; border: 1px solid rgba(0,200,100,0.3); }
.project-card p { font-size: 0.88rem; line-height: 1.6; color: var(--text-secondary); margin: 0 0 0.8rem; }
.project-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.project-tags span { font-size: 0.7rem; font-family: 'JetBrains Mono', monospace; padding: 2px 8px; border-radius: 4px; background: rgba(0,212,255,0.08); color: var(--accent); border: 1px solid rgba(0,212,255,0.2); }

/* Responsive */
@media (max-width: 992px) {
    .hero-content { grid-template-columns: 1fr; }
    .hero-text { text-align: center; }
    .hero-text h1 { font-size: 2.8rem; }
    .cta-group { justify-content: center; }
    .contact-wrapper { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .nav-links { display: none; position: absolute; top: 100%; left: 0; width: 100%; background-color: var(--navbar-bg); flex-direction: column; padding: 1rem 0; text-align: center; border-bottom: 1px solid var(--border); }
    .nav-links.active { display: flex; }
    .hamburger { display: flex; }
    .section-pad { padding: 3rem 0; }
    .hero-terminal { height: 300px; }
}

/* ==== Timeline Dual ==== */
.tl-col-headers { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; padding: 0 4px; }
.tl-col-header { font-size: 0.72rem; font-family: 'JetBrains Mono', monospace; text-transform: uppercase; letter-spacing: 0.07em; color: var(--text-secondary); width: 240px; }
.tl-col-header:last-child { text-align: left; }
.tl-col-header:first-child { text-align: right; }

.tl-legend { display: flex; gap: 1.2rem; flex-wrap: wrap; margin-bottom: 2rem; font-size: 0.75rem; font-family: 'JetBrains Mono', monospace; }
.tl-legend-item { display: flex; align-items: center; gap: 6px; color: var(--text-secondary); }
.tl-legend-item::before { content: ''; display: inline-block; width: 8px; height: 8px; border-radius: 50%; }
.tl-legend-item.tl-main::before    { background: #3B8BD4; }
.tl-legend-item.tl-side::before    { background: #1D9E75; }
.tl-legend-item.tl-current::before { background: #BA7517; }

.tl-dual { position: relative; padding: 1.5rem 0 2rem; overflow: visible; }
.tl-axis { position: absolute; left: 50%; top: 0; bottom: 0; width: 2px; background: var(--border); transform: translateX(-50%); }

.tl-node-wrap { position: relative; margin-bottom: 36px; display: flex; align-items: flex-start; justify-content: center; min-height: 52px; overflow: visible; }
.tl-dot-wrap { position: relative; z-index: 2; flex-shrink: 0; }

.tl-dot { width: 52px; height: 52px; border-radius: 50%; border: 2px solid; display: flex; flex-direction: column; align-items: center; justify-content: center; background: var(--card-bg); transition: transform .2s ease; position: relative; z-index: 3; cursor: default; }
.tl-node-wrap:hover .tl-dot { transform: scale(1.1); }

.tl-age { font-size: 11px; font-weight: 600; font-family: 'JetBrains Mono', monospace; line-height: 1.2; }
.tl-year { font-size: 9px; line-height: 1; opacity: 0.65; font-family: 'JetBrains Mono', monospace; }

.tl-connector-left, .tl-connector-right { position: absolute; top: 26px; width: calc(50% - 26px); height: 1px; background: var(--border); }
.tl-connector-left  { right: 50%; }
.tl-connector-right { left: 50%; }

.tl-side { position: absolute; top: 0; width: calc(50% - 40px); opacity: 0; pointer-events: none; transition: opacity .2s ease, transform .2s ease; z-index: 10; }
.tl-side.left { right: calc(50% + 34px); transform: translateX(10px); text-align: right; }
.tl-side.right { left: calc(50% + 34px); transform: translateX(-10px); text-align: left; }
.tl-node-wrap:hover .tl-side { opacity: 1; pointer-events: all; transform: translateX(0); }

.tl-panel { background: var(--card-bg); border: 1px solid var(--border); border-radius: 12px; padding: 10px 12px; display: inline-block; text-align: left; max-width: 100%; }
.tl-side.left .tl-panel { float: right; }

.tl-panel-label { font-size: 10px; font-weight: 600; font-family: 'JetBrains Mono', monospace; letter-spacing: 0.07em; text-transform: uppercase; margin-bottom: 6px; padding-bottom: 5px; border-bottom: 1px solid var(--border); }
.lbl-job     { color: #3B8BD4; }
.lbl-proj    { color: #1D9E75; }
.lbl-current { color: #BA7517; }

.tl-entry { padding: 5px 0; border-bottom: 1px solid var(--border); }
.tl-entry:last-child { border-bottom: none; padding-bottom: 0; }
.tl-entry-title { font-size: 12px; font-weight: 600; color: var(--text-primary); margin-bottom: 2px; line-height: 1.3; }
.tl-entry-org { font-size: 11px; color: var(--text-secondary); }

@media (max-width: 640px) {
    .tl-side { width: calc(50% - 32px); }
    .tl-dot { width: 44px; height: 44px; }
    .tl-age  { font-size: 10px; }
    .tl-year { font-size: 8px; }
    .tl-entry-title { font-size: 11px; }
    .tl-entry-org   { font-size: 10px; }
    .tl-panel { padding: 8px 10px; }
    .tl-col-headers { display: none; }
}