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

:root {
    --gold: #D4AF37;
    --gold-light: #F0D060;
    --gold-dark: #A88A1A;
    --dark: #0A0A0A;
    --dark-card: #111111;
    --dark-border: #1E1E1E;
    --text: #E5E5E5;
    --text-muted: #888888;
}

[data-theme="light"] {
    --dark: #FFFFFF;
    --dark-card: #F8F9FA;
    --dark-border: #E5E7EB;
    --text: #1F2937;
    --text-muted: #6B7280;
}

html { scroll-behavior: smooth; }

body {
    background: var(--dark);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--dark); }
::-webkit-scrollbar-thumb { background: var(--gold-dark); border-radius: 3px; }

/* ── Theme Toggle ── */
.theme-toggle {
    position: relative;
    width: 50px;
    height: 26px;
    background: var(--dark-border);
    border-radius: 20px;
    cursor: pointer;
    transition: background 0.3s;
    display: flex;
    align-items: center;
    padding: 3px;
}
.theme-toggle-slider {
    position: absolute;
    width: 20px;
    height: 20px;
    background: var(--gold);
    border-radius: 50%;
    transition: transform 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
}
.theme-toggle.active .theme-toggle-slider {
    transform: translateX(24px);
}
.theme-toggle-icon {
    font-size: 11px;
    color: var(--dark);
}

/* ── Utilities ── */
.gold-text {
    background: linear-gradient(135deg, var(--gold), var(--gold-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section { padding: 100px 0; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.section-label { color: var(--gold); font-size: 12px; letter-spacing: 4px; text-transform: uppercase; margin-bottom: 8px; font-family: 'JetBrains Mono', monospace; }
.section-title { font-size: clamp(28px, 4vw, 40px); font-weight: 700; margin-bottom: 48px; }
.tag {
    display: inline-block;
    font-size: 11px;
    padding: 4px 10px;
    border-radius: 20px;
    background: rgba(212,175,55,0.08);
    color: var(--gold);
    border: 1px solid rgba(212,175,55,0.2);
    font-family: 'JetBrains Mono', monospace;
}
.card {
    background: var(--dark-card);
    border: 1px solid var(--dark-border);
    border-radius: 12px;
    padding: 24px;
    transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s, background-color 0.3s;
}
.card:hover {
    border-color: rgba(212,175,55,0.5);
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(212,175,55,0.08);
}
.btn-primary {
    display: inline-block;
    padding: 12px 28px;
    background: linear-gradient(135deg, var(--gold), var(--gold-dark));
    color: #0A0A0A;
    font-weight: 700;
    font-size: 14px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: box-shadow 0.3s, transform 0.2s;
    text-decoration: none;
}
.btn-primary:hover { box-shadow: 0 0 24px rgba(212,175,55,0.4); transform: translateY(-2px); }
.btn-outline {
    display: inline-block;
    padding: 12px 28px;
    border: 1px solid rgba(212,175,55,0.4);
    color: var(--gold);
    font-weight: 600;
    font-size: 14px;
    border-radius: 8px;
    background: transparent;
    cursor: pointer;
    transition: background 0.3s, box-shadow 0.3s;
    text-decoration: none;
}
.btn-outline:hover { background: rgba(212,175,55,0.08); box-shadow: 0 0 16px rgba(212,175,55,0.15); }

/* ── Navbar ── */
#navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    padding: 18px 0;
    transition: background 0.3s, box-shadow 0.3s;
}
#navbar.scrolled {
    background: rgba(10,10,10,0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 rgba(212,175,55,0.1);
}
.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}
.nav-logo {
    font-size: 20px;
    font-weight: 800;
    text-decoration: none;
}
.nav-links { display: flex; gap: 32px; list-style: none; align-items: center; }
.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}
.nav-links a:hover { color: var(--gold); }
.nav-resume {
    padding: 8px 20px;
    border: 1px solid rgba(212,175,55,0.4);
    color: var(--gold);
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.3s;
}
.nav-resume:hover { background: rgba(212,175,55,0.1); }
.nav-hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
.nav-hamburger span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: 0.3s; }
.nav-mobile {
    display: none;
    flex-direction: column;
    gap: 16px;
    padding: 20px 24px;
    background: rgba(10,10,10,0.98);
    border-top: 1px solid var(--dark-border);
}
.nav-mobile.open { display: flex; }
.nav-mobile a { color: var(--text-muted); text-decoration: none; font-size: 15px; }
.nav-mobile a:hover { color: var(--gold); }

/* ── Hero ── */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}
#particles-canvas {
    position: absolute;
    inset: 0;
    z-index: 0;
    opacity: 1;
    transition: opacity 0.5s ease;
}
[data-theme="light"] #particles-canvas {
    opacity: 1;
}
.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    border: 1px solid rgba(212,175,55,0.3);
    border-radius: 20px;
    font-size: 12px;
    color: var(--gold);
    margin-bottom: 24px;
    font-family: 'JetBrains Mono', monospace;
}
.hero-badge::before { content: ''; width: 6px; height: 6px; background: var(--gold); border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.3} }
.hero-name { font-size: clamp(40px, 7vw, 72px); font-weight: 800; line-height: 1.1; margin-bottom: 16px; }
.hero-roles { font-size: clamp(16px, 2.5vw, 22px); color: var(--text-muted); margin-bottom: 16px; font-weight: 300; }
.hero-roles span { color: var(--gold); font-weight: 500; }
.hero-tagline { font-size: 16px; color: var(--text-muted); margin-bottom: 40px; max-width: 500px; line-height: 1.7; }
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 11px;
    letter-spacing: 2px;
    text-transform: uppercase;
}
.scroll-line { width: 1px; height: 40px; background: linear-gradient(to bottom, var(--gold), transparent); animation: scrollAnim 2s ease-in-out infinite; }
@keyframes scrollAnim { 0%{opacity:0;transform:scaleY(0);transform-origin:top} 50%{opacity:1;transform:scaleY(1)} 100%{opacity:0;transform:scaleY(0);transform-origin:bottom} }

/* ── About ── */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.about-summary { font-size: 15px; color: var(--text-muted); line-height: 1.8; margin-bottom: 32px; }
.experience-item { display: flex; gap: 16px; margin-bottom: 24px; }
.exp-icon { width: 44px; height: 44px; border-radius: 10px; background: rgba(212,175,55,0.08); border: 1px solid rgba(212,175,55,0.2); display: flex; align-items: center; justify-content: center; font-size: 20px; flex-shrink: 0; }
.exp-title { font-weight: 600; font-size: 15px; margin-bottom: 4px; }
.exp-sub { font-size: 13px; color: var(--text-muted); }
.skills-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.skill-card { background: var(--dark-card); border: 1px solid var(--dark-border); border-radius: 10px; padding: 16px; }
.skill-card-title { font-size: 12px; color: var(--gold); letter-spacing: 2px; text-transform: uppercase; margin-bottom: 12px; font-family: 'JetBrains Mono', monospace; }
.skill-tags { display: flex; flex-wrap: wrap; gap: 6px; }

/* ── Projects ── */
.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 40px; }
.filter-btn {
    padding: 8px 20px;
    border-radius: 20px;
    border: 1px solid var(--dark-border);
    background: transparent;
    color: var(--text-muted);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}
.filter-btn.active, .filter-btn:hover {
    border-color: var(--gold);
    color: var(--gold);
    background: rgba(212,175,55,0.08);
}
.projects-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 24px; }
.project-card { display: flex; flex-direction: column; }
.project-card.hidden { display: none; }
.project-featured { border-color: rgba(212,175,55,0.3); }
.featured-badge { font-size: 10px; color: var(--gold); letter-spacing: 2px; text-transform: uppercase; margin-bottom: 12px; font-family: 'JetBrains Mono', monospace; }
.project-title { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.project-desc { font-size: 14px; color: var(--text-muted); line-height: 1.6; margin-bottom: 16px; flex: 1; }
.project-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 20px; }
.project-links { display: flex; gap: 12px; margin-top: auto; }
.project-link {
    font-size: 13px;
    color: var(--gold);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: opacity 0.2s;
}
.project-link:hover { opacity: 0.7; }

/* ── GitHub ── */
.github-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 40px; flex-wrap: wrap; gap: 16px; }
.github-input-row { display: flex; gap: 10px; }
.github-input {
    padding: 10px 16px;
    background: var(--dark-card);
    border: 1px solid var(--dark-border);
    border-radius: 8px;
    color: var(--text);
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
    width: 200px;
}
.github-input:focus { border-color: var(--gold); }
.github-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.repo-card { position: relative; }
.repo-name { font-size: 15px; font-weight: 600; color: var(--gold); margin-bottom: 8px; text-decoration: none; display: block; }
.repo-desc { font-size: 13px; color: var(--text-muted); line-height: 1.5; margin-bottom: 16px; min-height: 40px; }
.repo-meta { display: flex; gap: 16px; font-size: 12px; color: var(--text-muted); }
.repo-meta span { display: flex; align-items: center; gap: 4px; }
.repo-lang-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--gold); }
#github-loading { text-align: center; color: var(--text-muted); padding: 40px; }

/* ── AI Capabilities ── */
.ai-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
.ai-card { text-align: center; }
.ai-icon { font-size: 40px; margin-bottom: 16px; }
.ai-title { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.ai-desc { font-size: 14px; color: var(--text-muted); line-height: 1.6; }
.ai-banner {
    margin-top: 60px;
    padding: 40px;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(212,175,55,0.05), rgba(212,175,55,0.02));
    border: 1px solid rgba(212,175,55,0.2);
    text-align: center;
}
.ai-banner h3 { font-size: 22px; font-weight: 700; margin-bottom: 8px; }
.ai-banner p { color: var(--text-muted); font-size: 14px; }

/* ── Teaching ── */
.teaching-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.teaching-summary { font-size: 15px; color: var(--text-muted); line-height: 1.8; margin-bottom: 32px; }
.topic-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.topic-item { display: flex; align-items: center; gap: 12px; font-size: 14px; }
.topic-item::before { content: '▸'; color: var(--gold); font-size: 12px; }
.teaching-cards { display: flex; flex-direction: column; gap: 16px; }
.teaching-card-icon { font-size: 24px; margin-bottom: 10px; }
.teaching-card-title { font-weight: 600; margin-bottom: 6px; }
.teaching-card-desc { font-size: 13px; color: var(--text-muted); line-height: 1.6; }

/* ── Contact ── */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; }
.contact-tagline { font-size: clamp(24px, 3vw, 32px); font-weight: 700; margin-bottom: 16px; }
.contact-sub { font-size: 15px; color: var(--text-muted); line-height: 1.7; margin-bottom: 32px; }
.social-links { display: flex; gap: 16px; }
.social-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: 1px solid var(--dark-border);
    border-radius: 8px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s;
}
.social-link:hover { border-color: var(--gold); color: var(--gold); }
.contact-form { display: flex; flex-direction: column; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-label { font-size: 12px; color: var(--text-muted); letter-spacing: 1px; text-transform: uppercase; }
.form-input, .form-textarea {
    padding: 12px 16px;
    background: var(--dark-card);
    border: 1px solid var(--dark-border);
    border-radius: 8px;
    color: var(--text);
    font-size: 14px;
    font-family: 'Inter', sans-serif;
    outline: none;
    transition: border-color 0.2s;
}
.form-input:focus, .form-textarea:focus { border-color: var(--gold); }
.form-textarea { resize: vertical; min-height: 120px; }
.form-status { font-size: 13px; margin-top: 8px; min-height: 20px; }
.form-status.success { color: #4ade80; }
.form-status.error { color: #f87171; }

/* ── Footer ── */
footer {
    border-top: 1px solid var(--dark-border);
    padding: 32px 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
}
footer span { color: var(--gold); }

/* ── Chatbot ── */
#chatbot-toggle {
    position: fixed;
    bottom: 28px;
    right: 28px;
    z-index: 9999;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--gold), var(--gold-dark));
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    box-shadow: 0 4px 20px rgba(212,175,55,0.4);
    transition: transform 0.2s, box-shadow 0.2s;
}
#chatbot-toggle:hover { transform: scale(1.1); box-shadow: 0 6px 28px rgba(212,175,55,0.5); }
#chatbot-window {
    position: fixed;
    bottom: 96px;
    right: 28px;
    z-index: 9998;
    width: 360px;
    max-height: 520px;
    background: var(--dark-card);
    border: 1px solid rgba(212,175,55,0.25);
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 60px rgba(0,0,0,0.6);
    transform: scale(0.9) translateY(20px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s cubic-bezier(0.34,1.56,0.64,1), opacity 0.3s, background-color 0.3s;
    overflow: hidden;
}
#chatbot-window.open { transform: scale(1) translateY(0); opacity: 1; pointer-events: all; }
.chat-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--dark-border);
    display: flex;
    align-items: center;
    gap: 12px;
}
.chat-avatar { width: 36px; height: 36px; border-radius: 50%; background: linear-gradient(135deg, var(--gold), var(--gold-dark)); display: flex; align-items: center; justify-content: center; font-size: 16px; }
.chat-header-info { flex: 1; }
.chat-header-name { font-weight: 600; font-size: 14px; }
.chat-header-status { font-size: 11px; color: #4ade80; display: flex; align-items: center; gap: 4px; }
.chat-header-status::before { content: ''; width: 6px; height: 6px; background: #4ade80; border-radius: 50%; }
.chat-close { background: none; border: none; color: var(--text-muted); cursor: pointer; font-size: 18px; padding: 4px; }
.chat-messages { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.chat-messages::-webkit-scrollbar { width: 3px; }
.chat-messages::-webkit-scrollbar-thumb { background: var(--dark-border); }
.msg { max-width: 80%; padding: 10px 14px; border-radius: 12px; font-size: 13px; line-height: 1.5; animation: msgIn 0.3s ease; }
@keyframes msgIn { from{opacity:0;transform:translateY(8px)} to{opacity:1;transform:translateY(0)} }
.msg.bot { background: var(--dark-border); color: var(--text); border-bottom-left-radius: 4px; align-self: flex-start; }
.msg.user { background: linear-gradient(135deg, var(--gold), var(--gold-dark)); color: #0A0A0A; font-weight: 500; border-bottom-right-radius: 4px; align-self: flex-end; }
.typing-indicator { display: flex; gap: 4px; align-items: center; padding: 10px 14px; background: var(--dark-border); border-radius: 12px; border-bottom-left-radius: 4px; align-self: flex-start; width: fit-content; }
.typing-indicator span { width: 6px; height: 6px; background: var(--text-muted); border-radius: 50%; animation: typingDot 1.2s infinite; }
.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }
@keyframes typingDot { 0%,60%,100%{transform:translateY(0)} 30%{transform:translateY(-6px)} }
.chat-input-row {
    padding: 12px 16px;
    border-top: 1px solid var(--dark-border);
    display: flex;
    gap: 8px;
}
.chat-input {
    flex: 1;
    padding: 10px 14px;
    background: var(--dark);
    border: 1px solid var(--dark-border);
    border-radius: 8px;
    color: var(--text);
    font-size: 13px;
    outline: none;
    transition: border-color 0.2s;
}
.chat-input:focus { border-color: rgba(212,175,55,0.4); }
.chat-send {
    width: 38px;
    height: 38px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--gold), var(--gold-dark));
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: opacity 0.2s;
}
.chat-send:hover { opacity: 0.85; }
.chat-suggestions { display: flex; flex-wrap: wrap; gap: 6px; padding: 0 16px 12px; }
.suggestion-btn {
    font-size: 11px;
    padding: 5px 10px;
    border-radius: 12px;
    border: 1px solid rgba(212,175,55,0.2);
    background: rgba(212,175,55,0.05);
    color: var(--gold);
    cursor: pointer;
    transition: background 0.2s;
}
.suggestion-btn:hover { background: rgba(212,175,55,0.12); }

/* ── Animations ── */
.fade-up { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ── Responsive ── */
@media (max-width: 768px) {
    .nav-links, .nav-resume { display: none; }
    .nav-hamburger { display: flex; }
    .about-grid, .teaching-grid, .contact-grid { grid-template-columns: 1fr; }
    .skills-grid { grid-template-columns: 1fr 1fr; }
    #chatbot-window { width: calc(100vw - 32px); right: 16px; bottom: 88px; }
    .section { padding: 70px 0; }
}
@media (max-width: 480px) {
    .skills-grid { grid-template-columns: 1fr; }
    .hero-btns { flex-direction: column; }
    .hero-btns a { text-align: center; }
}