:root {
    --color-1: #243642;
    --color-2: #387478;
    --color-3: #629584;
    --color-4: #E2F1E7;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, sans-serif;
    background-color: var(--color-1);
    color: var(--color-4);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
}

.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: rgba(36, 54, 66, 0.95);
    border-bottom: 1px solid rgba(226, 241, 231, 0.1);
}

.navbar {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--color-4);
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    gap: 28px;
}

.nav-menu a {
    color: var(--color-4);
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: var(--color-3);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-4);
    font-size: 1.8rem;
    cursor: pointer;
}

.section {
    padding: 90px 0;
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg,
            var(--color-1) 0%,
            var(--color-2) 100%);
}

.hero-content {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
}

.hero-subtitle {
    color: var(--color-3);
    font-size: 1rem;
    margin-bottom: 14px;
    letter-spacing: 1px;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 18px;
    color: var(--color-4);
}

.hero-text {
    max-width: 600px;
    font-size: 1.1rem;
    margin-bottom: 28px;
    color: rgba(226, 241, 231, 0.9);
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--color-3);
    color: var(--color-1);
    font-weight: bold;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.btn:hover {
    background-color: var(--color-4);
    transform: translateY(-2px);
}

h2 {
    font-size: 2rem;
    margin-bottom: 24px;
    color: var(--color-4);
}

.card {
    background-color: var(--color-2);
    border: 1px solid rgba(226, 241, 231, 0.08);
    border-radius: 14px;
    padding: 24px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.profile-card p+p {
    margin-top: 12px;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.project-card h3 {
    margin-bottom: 12px;
    color: var(--color-4);
}

.project-card p {
    margin-bottom: 16px;
    color: rgba(226, 241, 231, 0.92);
}

.project-card:hover {
    transform: translateY(-6px);
    transition: transform 0.3s ease;
}

.tag {
    display: inline-block;
    margin-right: 8px;
    margin-top: 8px;
    padding: 6px 10px;
    border-radius: 999px;
    background-color: var(--color-3);
    color: var(--color-1);
    font-size: 0.85rem;
    font-weight: bold;
}

.skills-box {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.skill-item {
    padding: 12px 18px;
    background-color: var(--color-2);
    border: 1px solid rgba(226, 241, 231, 0.08);
    border-radius: 10px;
    font-weight: 600;
}

.sns-card p+p {
    margin-top: 10px;
}

.footer {
    padding: 24px;
    text-align: center;
    border-top: 1px solid rgba(226, 241, 231, 0.08);
    color: rgba(226, 241, 231, 0.8);
    background-color: var(--color-1);
}

@media (max-width: 900px) {
    .project-grid {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 2.3rem;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .nav-menu {
        position: absolute;
        top: 70px;
        right: 5%;
        width: 220px;
        background-color: var(--color-2);
        flex-direction: column;
        padding: 20px;
        border-radius: 12px;
        display: none;
        gap: 16px;
    }

    .nav-menu.active {
        display: flex;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .section {
        padding: 70px 0;
    }
}