/* ===== Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #0a0a0f;
    --surface: #12121a;
    --surface-2: #1a1a26;
    --surface-3: #222233;
    --accent: #6c63ff;
    --accent-hover: #5a52e0;
    --accent-glow: rgba(108, 99, 255, 0.15);
    --accent-2: #00d4aa;
    --text: #e8e8ef;
    --text-light: #9a9ab0;
    --border: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);
    --card-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
    --transition: 0.3s ease;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text);
    background: var(--primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: transparent;
    transition: background var(--transition), box-shadow var(--transition), border-color var(--transition);
    border-bottom: 1px solid transparent;
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    border-bottom-color: var(--border);
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: #fff;
    text-decoration: none;
    letter-spacing: -1px;
    transition: color var(--transition);
}

.navbar.scrolled .nav-logo {
    color: #fff;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color var(--transition);
}

.navbar.scrolled .nav-links a {
    color: rgba(255, 255, 255, 0.6);
}

.nav-links a:hover {
    color: var(--accent);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: #fff;
    transition: all var(--transition);
}

.navbar.scrolled .nav-toggle span {
    background: #fff;
}

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    background: var(--primary);
    background-image:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(108, 99, 255, 0.15), transparent),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(0, 212, 170, 0.06), transparent);
    color: #fff;
    text-align: left;
    padding: 120px 24px 80px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.015'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

.hero-content {
    max-width: 1100px;
    width: 100%;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

.hero-greeting {
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 16px;
}

.hero-name {
    font-size: clamp(2.8rem, 7vw, 5rem);
    font-weight: 800;
    letter-spacing: -3px;
    line-height: 1.05;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #fff 0%, rgba(255, 255, 255, 0.7) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title {
    font-size: clamp(1.2rem, 3vw, 1.5rem);
    font-weight: 400;
    color: var(--text-light);
    margin-bottom: 8px;
}

.hero-location {
    font-size: 0.9rem;
    color: var(--text-light);
    opacity: 0.6;
    margin-bottom: 40px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: flex-start;
    flex-wrap: wrap;
    margin-bottom: 48px;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition);
    cursor: pointer;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    border: 1px solid var(--accent);
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(108, 99, 255, 0.35);
}

.btn-outline {
    border: 1px solid var(--border-hover);
    color: var(--text-light);
    background: transparent;
}

.btn-outline:hover {
    border-color: var(--accent);
    color: #fff;
    background: var(--accent-glow);
}

.hero-social {
    display: flex;
    gap: 24px;
    justify-content: flex-start;
}

.hero-social a {
    color: rgba(255, 255, 255, 0.3);
    transition: color var(--transition), transform var(--transition);
}

.hero-social a:hover {
    color: var(--accent);
    transform: translateY(-3px);
}

/* ===== Sections ===== */
.section {
    padding: 100px 0;
    background: var(--primary);
}

.section-alt {
    background: var(--surface);
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: left;
    margin-bottom: 60px;
    letter-spacing: -1px;
    color: #fff;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    margin: 16px 0 0;
    border-radius: 2px;
}

/* ===== About ===== */
.about-content {
    max-width: 800px;
    margin: 0;
    text-align: left;
}

.about-content p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 32px;
    line-height: 1.8;
}

.expertise-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: flex-start;
}

.expertise-tag {
    padding: 8px 20px;
    background: var(--surface-2);
    color: var(--accent);
    border: 1px solid var(--border);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all var(--transition);
}

.expertise-tag:hover {
    border-color: var(--accent);
    background: var(--accent-glow);
}

/* ===== Timeline ===== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(180deg, var(--accent), var(--border), transparent);
}

.timeline-item {
    position: relative;
    margin-bottom: 48px;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease;
}

.timeline-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.timeline-marker {
    position: absolute;
    left: -36px;
    top: 4px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--surface);
    box-shadow: 0 0 12px rgba(108, 99, 255, 0.4);
}

.timeline-date {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 4px;
}

.timeline-content h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 4px;
    color: #fff;
}

.company {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 12px;
}

.timeline-content p {
    color: var(--text-light);
    margin-bottom: 12px;
}

.timeline-content ul {
    list-style: none;
    padding: 0;
}

.timeline-content li {
    position: relative;
    padding-left: 20px;
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 6px;
}

.timeline-content li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
}

/* ===== Skills ===== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.skill-card {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease;
}

.skill-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.skill-card:hover {
    border-color: var(--accent);
    box-shadow: 0 0 30px rgba(108, 99, 255, 0.1);
    transform: translateY(-2px);
}

.skill-icon {
    color: var(--accent);
}

.skill-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
}

.skill-bar {
    height: 4px;
    background: var(--surface-3);
    border-radius: 2px;
    overflow: hidden;
}

.skill-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    border-radius: 2px;
    transition: width 1s ease;
}

/* ===== Education ===== */
.education-card {
    max-width: 600px;
    margin: 0;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 40px;
    display: flex;
    align-items: center;
    gap: 24px;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease;
}

.education-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.edu-icon {
    color: var(--accent);
    flex-shrink: 0;
}

.education-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 4px;
    color: #fff;
}

.edu-major {
    color: var(--text-light);
    font-weight: 500;
    margin-bottom: 2px;
}

.edu-school {
    color: var(--accent);
    font-size: 0.9rem;
    font-weight: 500;
}

/* ===== Certifications ===== */
.certs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 16px;
    max-width: 900px;
    margin: 0;
}

.cert-card {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px 24px;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease;
}

.cert-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.cert-card:hover {
    border-color: var(--accent);
    box-shadow: 0 0 20px rgba(108, 99, 255, 0.08);
}

.cert-icon {
    color: var(--accent);
    flex-shrink: 0;
    margin-top: 2px;
}

.cert-card h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 2px;
    color: #fff;
}

.cert-org {
    color: var(--text-light);
    font-size: 0.85rem;
}

.cert-date {
    color: var(--accent-2);
    font-size: 0.8rem;
    font-weight: 500;
}

/* ===== Awards ===== */
.awards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    max-width: 900px;
    margin: 0;
}

.award-card {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
    text-align: left;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease;
}

.award-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.award-card:hover {
    border-color: var(--accent);
    box-shadow: 0 0 20px rgba(108, 99, 255, 0.08);
    transform: translateY(-2px);
}

.award-year {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-2);
    margin-bottom: 8px;
}

.award-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 4px;
    color: #fff;
}

.award-card p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* ===== Community ===== */
.community-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
    max-width: 800px;
    margin: 0;
}

.community-card {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px 24px;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease;
}

.community-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.community-card:hover {
    border-color: var(--accent);
}

.community-card svg {
    color: var(--accent);
    flex-shrink: 0;
}

.community-card span {
    font-size: 0.95rem;
    font-weight: 500;
    color: #fff;
}

.community-detail {
    color: var(--text-light);
    font-size: 0.8rem;
    margin-top: 2px;
}

/* ===== Contact ===== */
.contact-intro {
    text-align: left;
    color: var(--text-light);
    font-size: 1.1rem;
    margin-top: -36px;
    margin-bottom: 48px;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
    max-width: 800px;
    margin: 0;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 20px 24px;
    border: 1px solid var(--border);
    border-radius: 12px;
    text-decoration: none;
    color: var(--text);
    background: var(--surface-2);
    transition: all var(--transition);
}

.contact-card:hover {
    border-color: var(--accent);
    box-shadow: 0 0 20px rgba(108, 99, 255, 0.08);
    transform: translateY(-2px);
}

.contact-card svg {
    color: var(--accent);
    flex-shrink: 0;
}

.contact-card span {
    font-size: 0.9rem;
    font-weight: 500;
}

/* ===== Footer ===== */
.footer {
    background: var(--surface);
    color: var(--text-light);
    text-align: center;
    padding: 32px 24px;
    font-size: 0.85rem;
    border-top: 1px solid var(--border);
}

/* ===== AI Chat Widget ===== */
.chat-widget {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
}

.chat-toggle {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--accent);
    border: none;
    cursor: pointer;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: 0 4px 20px rgba(108, 99, 255, 0.4);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.chat-toggle:hover {
    transform: scale(1.08);
    box-shadow: 0 6px 28px rgba(108, 99, 255, 0.5);
}

.chat-avatar-pulse {
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    border: 2px solid var(--accent);
    animation: chatPulse 2s ease-in-out infinite;
}

@keyframes chatPulse {
    0%, 100% { transform: scale(1); opacity: 0.6; }
    50% { transform: scale(1.15); opacity: 0; }
}

.chat-close-icon {
    display: none;
}

.chat-widget.open .chat-avatar-icon,
.chat-widget.open .chat-avatar-pulse {
    display: none;
}

.chat-widget.open .chat-close-icon {
    display: block;
}

.chat-window {
    position: absolute;
    bottom: 76px;
    right: 0;
    width: 370px;
    height: 500px;
    background: var(--surface);
    border: 1px solid var(--border-hover);
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.4);
    opacity: 0;
    transform: translateY(20px) scale(0.9);
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.chat-widget.open .chat-window {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.chat-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--surface-2);
    border-bottom: 1px solid var(--border);
}

.chat-header-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.chat-ai-face {
    width: 32px;
    height: 32px;
    position: relative;
}

.ai-eye {
    position: absolute;
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    top: 8px;
    transition: all 0.2s ease;
}

.ai-eye.left { left: 6px; }
.ai-eye.right { right: 6px; }

.ai-mouth {
    position: absolute;
    bottom: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 10px;
    height: 3px;
    background: var(--accent);
    border-radius: 2px;
    transition: all 0.15s ease;
}

.chat-ai-face.thinking .ai-eye {
    animation: eyeThink 1.2s ease-in-out infinite;
}

.chat-ai-face.thinking .ai-mouth {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    animation: mouthThink 1.2s ease-in-out infinite;
}

@keyframes eyeThink {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-2px); }
}

@keyframes mouthThink {
    0%, 100% { transform: translateX(-50%) scale(1); }
    50% { transform: translateX(-50%) scale(0.7); }
}

.chat-ai-face.talking .ai-mouth {
    animation: mouthTalk 0.3s ease-in-out infinite alternate;
}

@keyframes mouthTalk {
    0% { height: 3px; width: 10px; border-radius: 2px; }
    100% { height: 8px; width: 8px; border-radius: 50%; }
}

.chat-header-info {
    display: flex;
    flex-direction: column;
}

.chat-header-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
}

.chat-header-status {
    font-size: 0.75rem;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 4px;
}

.status-dot {
    width: 6px;
    height: 6px;
    background: var(--accent-2);
    border-radius: 50%;
    display: inline-block;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.chat-messages::-webkit-scrollbar {
    width: 4px;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--border-hover);
    border-radius: 2px;
}

.chat-message {
    max-width: 85%;
    animation: msgFadeIn 0.3s ease-out;
}

.chat-message.user {
    align-self: flex-end;
}

.chat-message.ai {
    align-self: flex-start;
}

.chat-msg-content {
    padding: 10px 14px;
    border-radius: 14px;
    font-size: 0.85rem;
    line-height: 1.5;
}

.chat-message.user .chat-msg-content {
    background: var(--accent);
    color: #fff;
    border-bottom-right-radius: 4px;
}

.chat-message.ai .chat-msg-content {
    background: var(--surface-2);
    color: var(--text);
    border: 1px solid var(--border);
    border-bottom-left-radius: 4px;
}

@keyframes msgFadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.typing-indicator .chat-msg-content {
    display: flex;
    gap: 4px;
    padding: 12px 18px;
}

.typing-indicator .dot {
    width: 6px;
    height: 6px;
    background: var(--text-light);
    border-radius: 50%;
    animation: typingDot 1.2s ease-in-out infinite;
}

.typing-indicator .dot:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator .dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingDot {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-6px); opacity: 1; }
}

.chat-input-wrap {
    display: flex;
    gap: 8px;
    padding: 12px 16px;
    border-top: 1px solid var(--border);
    background: var(--surface-2);
}

.chat-input-wrap input {
    flex: 1;
    background: var(--surface-3);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 10px 16px;
    color: var(--text);
    font-size: 0.85rem;
    font-family: inherit;
    outline: none;
    transition: border-color var(--transition);
}

.chat-input-wrap input:focus {
    border-color: var(--accent);
}

.chat-input-wrap input::placeholder {
    color: var(--text-light);
}

.chat-input-wrap button {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent);
    border: none;
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background var(--transition), transform var(--transition);
}

.chat-input-wrap button:hover {
    background: var(--accent-hover);
    transform: scale(1.05);
}

/* ===== Mobile ===== */
@media (max-width: 768px) {

    .chat-window {
        width: calc(100vw - 32px);
        right: -8px;
        height: 420px;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-social {
        justify-content: center;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--surface);
        flex-direction: column;
        padding: 80px 32px;
        gap: 24px;
        transition: right var(--transition);
        border-left: 1px solid var(--border);
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links a {
        color: rgba(255, 255, 255, 0.85) !important;
        font-size: 1.1rem;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .section {
        padding: 70px 0;
    }

    .section-title {
        margin-bottom: 40px;
    }

    .timeline {
        padding-left: 30px;
    }

    .timeline-marker {
        left: -26px;
    }

    .education-card {
        flex-direction: column;
        text-align: center;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }
}