:root {
    --primary: #3b82f6;
    --secondary: #10b981;
    --bg-dark: #020617;
    --text-main: #f8fafc;
    --text-dim: #94a3b8;
    --glass: rgba(15, 23, 42, 0.6);
    --border: rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Pretendard', sans-serif;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* Atmospheric Background Blobs */
.background-blobs {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.blob {
    position: absolute;
    width: 50vw;
    height: 50vw;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.15;
    animation: float 20s infinite alternate;
}

.blob-1 {
    background: var(--primary);
    top: -10%;
    right: -10%;
}

.blob-2 {
    background: var(--secondary);
    bottom: -10%;
    left: -10%;
    animation-delay: -5s;
}

@keyframes float {
    from {
        transform: translate(0, 0);
    }

    to {
        transform: translate(10%, 10%);
    }
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 60px 20px;
}

header {
    text-align: center;
    margin-bottom: 60px;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 15px;
}

.logo-icon {
    font-size: 4rem;
    animation: wave 2s infinite ease-in-out;
}

@keyframes wave {

    0%,
    100% {
        transform: rotate(0);
    }

    50% {
        transform: rotate(10deg);
    }
}

h1 {
    font-size: 3.5rem;
    font-weight: 900;
    background: linear-gradient(135deg, #fff 0%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -1.5px;
}

.subtitle {
    font-size: 1.3rem;
    color: var(--text-dim);
    font-weight: 500;
}

.glass {
    background: var(--glass);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: 28px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Tool Grid */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.tool-card {
    text-decoration: none;
    color: inherit;
    display: flex;
    padding: 35px;
    gap: 25px;
    overflow: hidden;
    position: relative;
}

.tool-card:hover {
    transform: translateY(-8px);
    border-color: rgba(59, 130, 246, 0.4);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    background: rgba(30, 41, 59, 0.8);
}

.card-icon {
    font-size: 3.5rem;
    background: rgba(255, 255, 255, 0.05);
    width: 90px;
    height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 22px;
}

.card-content {
    flex: 1;
}

.card-content h3 {
    font-size: 1.6rem;
    font-weight: 800;
    margin-bottom: 10px;
    color: #fff;
}

.card-content p {
    color: var(--text-dim);
    font-size: 1.1rem;
    margin-bottom: 20px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.btn-text {
    font-weight: 700;
    color: var(--primary);
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Promo Section */
.promo-section {
    padding: 40px;
    text-align: center;
    margin-top: 20px;
    border: 2px dashed var(--border);
}

.promo-text h4 {
    font-size: 1.4rem;
    margin-bottom: 8px;
    color: var(--secondary);
}

.promo-text p {
    color: var(--text-dim);
    font-size: 1.1rem;
}

/* Footer */
footer {
    margin-top: 100px;
    padding-top: 40px;
    border-top: 1px solid var(--border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-dim);
    font-size: 1rem;
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    color: inherit;
    text-decoration: none;
}

.footer-links a:hover {
    color: white;
}

@media (max-width: 800px) {
    .tool-grid {
        grid-template-columns: 1fr;
    }

    h1 {
        font-size: 2.5rem;
    }
}

@media (max-width: 500px) {
    body {
        padding: 0;
    }

    .container {
        padding: 40px 15px;
    }

    .tool-card {
        flex-direction: column;
        padding: 25px;
        text-align: center;
        gap: 15px;
    }

    .card-icon {
        margin: 0 auto;
        width: 70px;
        height: 70px;
        font-size: 2.5rem;
    }

    .card-content h3 {
        font-size: 1.3rem;
    }

    .card-content p {
        font-size: 1rem;
    }
}