:root {
    --primary: #6366f1;
    --primary-glow: rgba(99, 102, 241, 0.4);
    --bg-dark: #0f172a;
    --text-white: #f8fafc;
    --text-dim: #94a3b8;
    --glass: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: 'Outfit', 'Noto Sans KR', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-white);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Background Animations */
.background-blobs {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    filter: blur(80px);
}

.blob {
    position: absolute;
    border-radius: 50%;
    opacity: 0.5;
    animation: move-blobs 20s infinite alternate;
}

.blob-1 {
    width: 400px;
    height: 400px;
    background: var(--primary);
    top: -100px;
    left: -100px;
}

.blob-2 {
    width: 300px;
    height: 300px;
    background: #ec4899;
    bottom: -50px;
    right: -50px;
    animation-delay: -5s;
}

.blob-3 {
    width: 250px;
    height: 250px;
    background: #0ea5e9;
    top: 50%;
    left: 50%;
    animation-delay: -10s;
}

@keyframes move-blobs {
    from { transform: translate(0, 0) scale(1); }
    to { transform: translate(100px, 50px) scale(1.1); }
}

/* Nav */
nav {
    height: 80px;
    display: flex;
    align-items: center;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
}

nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(to right, #fff, var(--primary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dim);
    font-weight: 500;
    transition: 0.3s;
}

.nav-links a:hover {
    color: #fff;
}

.btn-nav {
    padding: 0.6rem 1.2rem;
    background: var(--primary);
    color: #fff !important;
    border-radius: 50px;
    font-size: 0.9rem;
    box-shadow: 0 4px 15px var(--primary-glow);
}

/* Hero */
.hero {
    padding: 180px 0 100px;
    min-height: 90vh;
    display: flex;
    align-items: center;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

h1 {
    font-size: 4.5rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    font-weight: 800;
}

.highlight {
    background: linear-gradient(to right, var(--primary), #a855f7);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-dim);
    margin-bottom: 2.5rem;
    max-width: 500px;
}

.cta-group {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 1rem 2.5rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1.1rem;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 10px 30px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px var(--primary-glow);
}

.btn-secondary {
    background: var(--glass);
    color: #fff;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Visual Mockup */
.hero-visual {
    display: flex;
    justify-content: center;
}

.diamond-mockup {
    width: 400px;
    height: 400px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.diamond {
    width: 200px;
    height: 200px;
    border: 2px solid var(--primary);
    transform: rotate(45deg);
    position: relative;
}

.base {
    position: absolute;
    width: 15px;
    height: 15px;
    background: #fff;
    transform: rotate(45deg);
}

.base.first { top: -8px; right: -8px; }
.base.second { top: -8px; left: -8px; }
.base.third { bottom: -8px; left: -8px; }

.ball-ui {
    position: absolute;
    bottom: 20px;
    background: var(--primary);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-weight: 800;
    font-size: 1.2rem;
    box-shadow: 0 5px 15px var(--primary-glow);
}

/* Features */
.features {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    font-size: 3rem;
    margin-bottom: 4rem;
    font-weight: 800;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.glass {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    border-radius: 24px;
    padding: 3rem;
    transition: 0.3s;
}

.feature-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.08);
}

.icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-dim);
}

/* Tech */
.tech {
    padding: 80px 0 150px;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
    padding: 2rem;
}

.tech-item {
    background: rgba(255, 255, 255, 0.05);
    padding: 1rem 2rem;
    border-radius: 50px;
    border: 1px solid var(--glass-border);
    font-weight: 600;
    color: var(--text-dim);
}

footer {
    padding: 4rem 0;
    border-top: 1px solid var(--glass-border);
    text-align: center;
    color: var(--text-dim);
}

/* Animations */
.fade-in { animation: fadeIn 1s ease forwards; }
.fade-in-delay { animation: fadeIn 1s ease 0.3s forwards; opacity: 0; }
.fade-in-delay-2 { animation: fadeIn 1s ease 0.6s forwards; opacity: 0; }
.fade-in-right { animation: fadeInRight 1.2s cubic-bezier(0.4, 0, 0.2, 1) forwards; opacity: 0; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInRight {
    from { opacity: 0; transform: translateX(50px); }
    to { opacity: 1; transform: translateX(0); }
}

@media (max-width: 968px) {
    .hero .container { grid-template-columns: 1fr; text-align: center; }
    .hero-content { display: flex; flex-direction: column; align-items: center; }
    .hero-visual { display: none; }
    h1 { font-size: 3.5rem; }
    .feature-grid { grid-template-columns: 1fr; }
}