:root {
    --color-bg: #0A192F;
    --color-bg-light: #112240;
    --color-primary: #64FFDA;
    --color-secondary: #00B4D8;
    --color-text: #8892B0;
    --color-text-light: #CCD6F6;
    --color-white: #E6F1FF;
    --gradient-hero: linear-gradient(135deg, rgba(10, 25, 47, 0.95) 0%, rgba(17, 34, 64, 0.95) 100%);
    --gradient-glow: radial-gradient(circle at 50% 50%, rgba(100, 255, 218, 0.1) 0%, transparent 70%);
    --font-main: 'Inter', 'Roboto', sans-serif;
    --font-mono: 'Fira Code', monospace;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.645, 0.045, 0.355, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-main);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
    font-size: 16px;
}

h1, h2, h3, h4, h5, h6 { color: var(--color-white); font-weight: 700; margin-bottom: var(--spacing-sm); line-height: 1.2; }
h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); color: var(--color-text-light); }
h3 { font-size: 1.5rem; color: var(--color-primary); }
p { margin-bottom: var(--spacing-sm); }
a { text-decoration: none; color: inherit; transition: var(--transition-fast); }
ul { list-style: none; }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 var(--spacing-md); }

.btn {
    display: inline-block; padding: 0.8rem 1.6rem; border: 1px solid var(--color-primary);
    border-radius: 4px; color: var(--color-primary); font-family: var(--font-mono);
    font-size: 0.9rem; cursor: pointer; background: transparent; transition: var(--transition-fast);
}
.btn:hover { background: rgba(100, 255, 218, 0.1); transform: translateY(-2px); }
.btn-filled { background: var(--color-primary); color: var(--color-bg); font-weight: 600; }
.btn-filled:hover { background: var(--color-secondary); color: var(--color-bg); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.section-title { display: flex; align-items: center; margin-bottom: var(--spacing-lg); font-size: 2rem; color: var(--color-text-light); }
.section-title::after { content: ""; display: block; width: 300px; height: 1px; background: var(--color-bg-light); margin-left: 20px; opacity: 0.5; }
.text-highlight { color: var(--color-primary); }

header {
    position: fixed; top: 0; width: 100%; background: rgba(10, 25, 47, 0.85);
    backdrop-filter: blur(10px); z-index: 1000; height: 80px; display: flex;
    align-items: center; box-shadow: 0 10px 30px -10px rgba(2, 12, 27, 0.7);
}
nav { display: flex; justify-content: space-between; align-items: center; width: 100%; }
.logo { font-size: 1.5rem; font-weight: 700; color: var(--color-primary); font-family: var(--font-mono); letter-spacing: 1px; }
.nav-links { display: flex; gap: var(--spacing-md); }
.nav-links li { counter-increment: item 1; }
.nav-links a { color: var(--color-text-light); font-size: 0.9rem; font-family: var(--font-mono); }
.nav-links a::before { content: "0" counter(item) "."; margin-right: 5px; color: var(--color-primary); font-size: 0.8rem; }
.nav-links a:hover { color: var(--color-primary); }
.menu-toggle { display: none; font-size: 1.5rem; color: var(--color-primary); cursor: pointer; }

.hero {
    min-height: 100vh; display: flex; align-items: center; justify-content: center;
    padding-top: 80px; background: var(--gradient-hero); position: relative; overflow: hidden;
}
.hero::before {
    content: ""; position: absolute; width: 600px; height: 600px;
    background: var(--gradient-glow); border-radius: 50%; top: 50%; left: 70%;
    transform: translate(-50%, -50%); opacity: 0.6; z-index: 0;
}
.hero-content { position: relative; z-index: 1; max-width: 800px; }
.hero-subtitle { color: var(--color-primary); font-family: var(--font-mono); margin-bottom: var(--spacing-sm); display: block; }
.hero-desc { max-width: 540px; font-size: 1.1rem; margin-bottom: var(--spacing-md); }

@keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.fade-in { animation: fadeIn 0.8s ease-out forwards; }
.hidden { opacity: 0; transform: translateY(30px); transition: all 0.6s ease-out; }
.visible { opacity: 1; transform: translateY(0); }

section { padding: var(--spacing-xl) 0; }

.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-lg); align-items: center; }
.about-list { margin-top: var(--spacing-md); }
.about-list li { margin-bottom: var(--spacing-xs); display: flex; align-items: center; color: var(--color-text-light); }
.about-list i { color: var(--color-primary); margin-right: 10px; }
.code-block {
    background: #112240; padding: var(--spacing-md); border-radius: 8px;
    font-family: var(--font-mono); font-size: 0.9rem; color: var(--color-primary);
    border-left: 3px solid var(--color-secondary); box-shadow: 0 10px 30px -15px rgba(2, 12, 27, 0.7);
}
.awards-box {
    margin-top: var(--spacing-md); background: rgba(100, 255, 218, 0.05);
    padding: var(--spacing-sm); border-radius: 4px; border-left: 2px solid var(--color-primary);
}
.awards-box h4 { font-size: 1.1rem; color: var(--color-primary); margin-bottom: var(--spacing-sm); }
.awards-box li { font-size: 0.9rem; color: var(--color-text-light); margin-bottom: 5px; }

.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(400px, 1fr)); gap: var(--spacing-md); margin-bottom: var(--spacing-lg); }
.project-card {
    background: #112240; padding: var(--spacing-md); border-radius: 8px; display: flex;
    align-items: flex-start; gap: var(--spacing-sm); transition: var(--transition-fast); border: 1px solid transparent;
}
.project-card:hover { transform: translateY(-5px); border-color: var(--color-secondary); background: #152a4d; }
.project-icon { font-size: 2rem; color: var(--color-secondary); min-width: 50px; text-align: center; }
.project-info h3 { margin-bottom: 5px; font-size: 1.2rem; color: var(--color-white); }
.project-info p { font-size: 0.95rem; color: var(--color-text); margin: 0; }

.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: var(--spacing-md); }
.service-card {
    background: var(--color-bg-light); padding: var(--spacing-md); border-radius: 6px;
    transition: var(--transition-fast); cursor: default; border: 1px solid transparent;
}
.service-card:hover { transform: translateY(-5px); border-color: var(--color-primary); box-shadow: 0 10px 30px -15px rgba(2, 12, 27, 0.7); }
.icon-box { font-size: 2.5rem; color: var(--color-primary); margin-bottom: var(--spacing-sm); }
.service-card h3 { margin-bottom: var(--spacing-xs); color: var(--color-text-light); }
.service-card p { font-size: 0.95rem; }

.section-tech { background: #112240; text-align: center; }
.section-tech .section-title { justify-content: center; }
.section-tech .section-title::after { display: none; }
.tech-intro { max-width: 600px; margin: 0 auto var(--spacing-md); font-size: 1.2rem; }
.tech-tags { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--spacing-sm); }
.tech-tags span { padding: 0.5rem 1rem; border: 1px solid var(--color-secondary); border-radius: 20px; color: var(--color-secondary); font-family: var(--font-mono); font-size: 0.9rem; }

.contact-wrapper { display: grid; grid-template-columns: 2fr 1fr; gap: var(--spacing-lg); }
.contact-info { padding: var(--spacing-md); background: var(--color-bg-light); border-radius: 6px; height: fit-content; }
.contact-info p { margin-bottom: var(--spacing-sm); display: flex; align-items: center; gap: 10px; }
.footer-note { font-size: 0.8rem; opacity: 0.7; margin-top: var(--spacing-md); border-top: 1px solid rgba(255, 255, 255, 0.1); padding-top: var(--spacing-sm); }

footer { text-align: center; padding: var(--spacing-md) 0; font-size: 0.9rem; color: var(--color-text); background: #020c1b; }

.chat-toggle {
    position: fixed; bottom: 20px; right: 20px; width: 60px; height: 60px;
    background: var(--color-primary); border-radius: 50%; display: flex; align-items: center;
    justify-content: center; font-size: 1.5rem; color: var(--color-bg); cursor: pointer;
    z-index: 2000; box-shadow: 0 4px 20px rgba(100, 255, 218, 0.3); transition: var(--transition-fast);
}
.chat-toggle:hover { transform: scale(1.1); background: var(--color-secondary); }
.section-chat { background: var(--color-bg-light); }
.chat-wrapper { display: flex; gap: var(--spacing-lg); align-items: flex-start; }
.chat-container {
    flex: 1; background: var(--color-bg); border-radius: 8px; overflow: hidden;
    border: 1px solid #233554; display: flex; flex-direction: column; height: 400px; max-height: 400px;
}
.chat-messages { flex: 1; overflow-y: auto; padding: var(--spacing-sm); display: flex; flex-direction: column; gap: var(--spacing-sm); }
.chat-message { display: flex; max-width: 80%; }
.chat-message.bot { align-self: flex-start; }
.chat-message.user { align-self: flex-end; }
.message-content { padding: 0.8rem 1rem; border-radius: 12px; font-size: 0.95rem; }
.chat-message.bot .message-content { background: var(--color-bg-light); color: var(--color-text-light); border-bottom-left-radius: 4px; }
.chat-message.user .message-content { background: var(--color-primary); color: var(--color-bg); border-bottom-right-radius: 4px; }

.typing-indicator .message-content { padding: 0.8rem 1.2rem; }
.typing-dots { display: flex; gap: 4px; align-items: center; }
.typing-dots span {
    width: 8px; height: 8px; border-radius: 50%; background: var(--color-primary);
    animation: typingBounce 1.4s infinite ease-in-out;
}
.typing-dots span:nth-child(1) { animation-delay: 0s; }
.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes typingBounce {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
    40% { transform: scale(1); opacity: 1; }
}

.chat-input-area { display: flex; gap: var(--spacing-sm); padding: var(--spacing-sm); border-top: 1px solid #233554; background: var(--color-bg-light); }
.chat-input-area input {
    flex: 1; padding: 0.8rem 1rem; background: var(--color-bg); border: 1px solid #233554;
    border-radius: 4px; color: var(--color-text-light); font-family: var(--font-main);
}
.chat-input-area input:focus { outline: none; border-color: var(--color-primary); }
.chat-input-area input:disabled { opacity: 0.5; }
.chat-input-area .btn { padding: 0.8rem 1.2rem; }

@media (max-width: 768px) {
    .nav-links { display: none; }
    .menu-toggle { display: block; }
    h1 { font-size: 2.5rem; }
    .section-title::after { width: 100px; }
    .about-grid, .contact-wrapper, .chat-wrapper { grid-template-columns: 1fr; flex-direction: column; }
    .projects-grid { grid-template-columns: 1fr; }
    .chat-container { height: 300px; }
}