:root {
    --bg-color: #f5f5f7;
    --card-bg: rgba(255, 255, 255, 0.9);
    --text-main: #1d1d1f;
    --text-sub: #6e6e73;
    --accent: #0071e3;
    --accent-glow: rgba(0, 113, 227, 0.2);
    --glass-border: rgba(255, 255, 255, 0.5);
    --shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
}

body.dark-mode {
    --bg-color: #000000;
    --card-bg: rgba(28, 28, 30, 0.9);
    --text-main: #f5f5f7;
    --text-sub: #86868b;
    --accent: #0a84ff;
    --accent-glow: rgba(10, 132, 255, 0.2);
    --glass-border: rgba(255, 255, 255, 0.1);
    --shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    transition: background 0.5s ease;
    overflow-x: hidden;
}

/* Navigation */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
}

nav {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;
    color: var(--text-main);
}

.logo span { color: var(--accent); }

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

.nav-links a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 500;
    opacity: 0.7;
    transition: opacity 0.3s, color 0.3s;
}

.nav-links a:hover, .nav-links a.active-link {
    opacity: 1;
    color: var(--accent);
}

.nav-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.lang-btn, .icon-btn {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    color: var(--text-main);
    font-weight: 600;
}

/* Page Management */
.page {
    display: none; /* 기본적으로 모든 페이지 숨김 */
    min-height: 100vh;
    padding: 120px 2rem 60px;
    max-width: 1000px;
    margin: 0 auto;
}

.page.active {
    display: flex; /* 활성화된 페이지인 경우에만 노출 */
    flex-direction: column;
    align-items: center;
    animation: slideUp 0.6s cubic-bezier(0.23, 1, 0.32, 1);
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Common Components */
.page-header {
    text-align: center;
    margin-bottom: 3rem;
}

.page-header h2 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -1px;
}

.page-header p {
    font-size: 1.2rem;
    color: var(--text-sub);
}

.tool-card {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: 30px;
    padding: 4rem;
    width: 100%;
    box-shadow: var(--shadow);
    text-align: center;
}

/* Home Section */
#home.active {
    justify-content: center;
    text-align: center;
}

#home h1 {
    font-size: 5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
}

.hero-btns {
    margin-top: 3rem;
    display: flex;
    gap: 1rem;
}

.primary-btn, .action-btn, .submit-btn {
    background: var(--accent);
    color: white;
    border: none;
    padding: 1.2rem 3rem;
    border-radius: 40px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.primary-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 30px var(--accent-glow);
}

/* Animal Test Result */
#result-display {
    margin-top: 3rem;
    width: 100%;
}

.result-img {
    width: 100%;
    max-width: 350px;
    border-radius: 20px;
    box-shadow: var(--shadow);
}

.conclusion-badge {
    background: var(--accent);
    color: white;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1.5rem;
    margin: 2rem 0;
    display: inline-block;
}

/* Contact Page Redesign */
.contact-card {
    max-width: 600px;
    margin: 0 auto;
    background: var(--card-bg);
    padding: 3rem;
    border-radius: 30px;
    box-shadow: var(--shadow);
    border: 1px solid var(--glass-border);
}

.input-group {
    margin-bottom: 2rem;
    text-align: left;
}

.input-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.8rem;
    color: var(--text-main);
}

.input-group input, .input-group textarea {
    width: 100%;
    padding: 1.2rem;
    border-radius: 15px;
    border: 1px solid var(--glass-border);
    background: var(--bg-color);
    color: var(--text-main);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s;
}

.input-group input:focus, .input-group textarea:focus {
    border-color: var(--accent);
}

/* Lotto balls */
.lotto-ball {
    width: 65px;
    height: 65px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0.5rem;
    background: linear-gradient(135deg, #ff9500 0%, #ff5e00 100%);
    box-shadow: 0 5px 15px rgba(255, 94, 0, 0.3);
}

.hidden { display: none !important; }

/* Disqus Section */
#comments-wrapper {
    width: 100%;
    max-width: 1000px;
    margin: 4rem auto;
    padding: 2rem;
    border-top: 1px solid var(--glass-border);
}