:root {
    --primary-color: #2CEEFB;
    --primary-hover: #89FBFB;
    --bg-dark: #121212;
    --bg-surface: #1E1E1E;
    --text-primary: #FFFFFF;
    --text-secondary: #A9A9A9;
    --border-color: #333333;
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    margin: 0;
    color: var(--text-primary);
    background-color: var(--bg-dark);
    line-height: 1.7;
    scroll-behavior: smooth;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section-padding {
    padding: 100px 0;
}

h1, h2, h3 {
    font-weight: 700;
    margin-top: 0;
    margin-bottom: 20px;
    line-height: 1.3;
}
h1 { font-size: 3.8rem; }
h2 { font-size: 3rem; text-align: center; margin-bottom: 60px; }
h3 { font-size: 2.2rem; }
p { font-size: 1.1rem; color: var(--text-secondary); margin-bottom: 20px; }

.button {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    text-align: center;
    border: 2px solid transparent;
}
.button-primary {
    background-color: var(--primary-color);
    color: #000;
}
.button-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(44, 238, 251, 0.2);
}

.button-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    box-shadow: 0 0 8px rgba(44, 238, 251, 0.5);
    transition: all 0.3s ease;
}
.button-outline:hover {
    background-color: rgba(44, 238, 251, 0.1);
    color: var(--primary-hover);
    border-color: var(--primary-hover);
    box-shadow: 0 0 15px rgba(44, 238, 251, 0.7);
    transform: translateY(-2px);
}

.navbar {
    background-color: rgba(18, 18, 18, 0.8);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}
.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.navbar .logo {
    height: 150px;
    transition: transform 0.2s ease-in-out, box-shadow 0.3s ease;
    box-shadow: 0 0 10px rgba(44, 238, 251, 0.5), 0 0 20px rgba(44, 238, 251, 0.3);
    border-radius: 8px;
}
.navbar .logo:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px rgba(44, 238, 251, 0.7), 0 0 30px rgba(44, 238, 251, 0.5);
}
.navbar nav {
    display: flex;
    align-items: center;
}
.navbar nav a {
    margin-left: 40px;
    color: var(--text-secondary);
    font-weight: 500;
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 1.2rem;
}
.navbar nav a:hover {
    color: var(--text-primary);
}
.navbar nav .button {
    padding: 16px 36px;
    margin-left: 50px;
    font-size: 1.1rem;
}

.hero {
    padding: 120px 0;
    text-align: center;
}
.hero-content h1 {
    color: var(--text-primary);
    background: linear-gradient(90deg, #FFFFFF, #B0B0B0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 25px;
}
.hero-content p {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto 40px auto;
}
.hero-image-wrapper {
    margin-top: 60px;
}
.hero-app-mockup {
    max-width: 80%;
    height: auto;
    border-radius: 20px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
}

.signup-form {
    display: flex;
    max-width: 550px;
    margin: 0 auto;
    border-radius: 12px;
    overflow: hidden;
    /* ✨ FIX: 테두리 효과를 버튼과 맞추기 위해 form 자체의 border는 제거 */
}
.signup-form input {
    flex: 1;
    padding: 18px 24px;
    border: 2px solid var(--border-color);
    outline: none;
    font-size: 1.1rem;
    background-color: var(--bg-surface);
    color: var(--text-primary);
    border-radius: 50px 0 0 50px;
    transition: border-color 0.3s ease;
}
.signup-form input:focus {
    border-color: var(--primary-color);
}
.signup-form button {
    padding: 18px 32px;
    border: none;
    font-weight: 700;
    border-radius: 0 50px 50px 0; /* ✨ 변경: 버튼 모양 통일 */
}

.features {
    background-color: var(--bg-dark);
}
.feature-grid {
    display: flex;
    flex-direction: column;
    gap: 100px;
}
.feature-item {
    display: flex;
    align-items: center;
    gap: 60px;
}
.feature-item.reverse {
    flex-direction: row-reverse;
}
.feature-media {
    flex: 1;
    background-color: var(--bg-surface);
    border-radius: 20px;
    padding: 20px;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
.feature-image-mobile-mockup {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: 12px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.3);
}
.feature-image-full {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 12px;
}
.feature-text {
    flex: 1;
}
.feature-text h3 {
    color: var(--primary-color);
}

.cta {
    background-color: var(--bg-surface);
    text-align: center;
}
.cta h2 { font-size: 2.8rem; }
.cta p { max-width: 600px; margin: 0 auto 40px auto; }
.store-buttons { margin-top: 30px; }
.coming-soon-text { color: var(--text-secondary); }

footer {
    background-color: var(--bg-surface);
    color: var(--text-secondary);
    padding: 40px 0;
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
}
footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.footer-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 20px;
    transition: color 0.3s ease;
}
.footer-nav a:hover {
    color: var(--text-primary);
}

.lang-switcher {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1001;
    background-color: var(--bg-surface);
    border-radius: 50px;
    padding: 8px;
    display: flex;
    gap: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-color);
}
.lang-switcher button {
    background: none;
    border: 2px solid transparent;
    cursor: pointer;
    font-size: 24px;
    padding: 0;
    line-height: 1;
    transition: transform 0.2s ease, border-color 0.2s ease;
    border-radius: 50%;
}
.lang-switcher button.active {
    border-color: var(--primary-color);
    transform: scale(1.1);
}
.lang-switcher button:hover {
    transform: scale(1.1);
}

@media (max-width: 992px) {
    .feature-item, .feature-item.reverse {
        flex-direction: column;
        text-align: center;
    }
    .navbar .logo { height: 120px; }
    .feature-media { min-height: 300px; }
    .navbar nav a { font-size: 1.1rem; }
    .navbar nav .button { padding: 14px 32px; font-size: 1rem; }
}
@media (max-width: 768px) {
    h1 { font-size: 2.8rem; }
    h2 { font-size: 2.2rem; }
    .hero { padding: 80px 0; }
    .signup-form { flex-direction: column; border: none; background: none; }
    .signup-form input { border-radius: 8px; margin-bottom: 10px; text-align: center; }
    .signup-form button { border-radius: 8px; }
    footer .container { flex-direction: column; gap: 15px; }
    .footer-nav { margin-top: 10px; }
    .footer-nav a { margin: 0 10px; }
    .navbar { padding: 10px 0; }
    .navbar .container { flex-direction: column; gap: 15px; }
    .navbar .logo { height: 80px; }
    .navbar nav a { font-size: 1rem; }
    .navbar nav .button { padding: 8px 16px; font-size: 0.8rem; }
}