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

body {
    font-family: 'Orbitron', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: #111;
    background: #fff;
    overflow-x: hidden;
}

/* ── NAV ── */
nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 48px;
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(196, 228, 248, 0.0);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.logo {
    font-family: 'Orbitron', sans-serif;
    font-weight: 900;
    font-size: 20px;
    letter-spacing: -1px;
    color: #1a5276;
    text-decoration: none;
    display: inline-flex;
    flex-direction: row;
    align-items: center;
    gap: 20px;
}

.logo-img {
    width: 100%;
    max-width: 160px;
    height: auto;
    object-fit: contain;
}

.logo span {
    white-space: nowrap;
}

.logo i {
    transform: rotate(-45deg);
    font-size: 26px;
    display: inline-block;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    font-family: 'Orbitron', sans-serif;
    font-size: 20px;
    font-weight: 600;
    color: #111;
    text-decoration: none;
}

.nav-links a:hover {
    text-decoration: underline;
}

.nav-links .get-started {
    font-family: 'Orbitron', sans-serif;
    font-size: 16px;
}

/* ── HERO + CAROUSEL 통합 배경 ── */
.hero-dashboard-bg {
    position: relative;
}

/* 백그라운드 이미지 */
.hero-dashboard-bg::before {
    content: '';
    position: fixed;
    inset: 0;
    background: url('/assets/images/citynightsky.jpg') center/cover no-repeat;
    opacity: 0.9;
    z-index: 0;
    pointer-events: none;
}

/* 그라데이션 영역 */
.hero-dashboard-bg::after {
    content: '';
    position: fixed;
    inset: 0;
    background: linear-gradient(180deg, #9ecbe7 0%, #95b2c4 25%, #e2f1fc 50%, #edf6ff 75%, #f5faff 100%);
    opacity: 0.85;
    z-index: 1;
    pointer-events: none;
}

.hero {
    text-align: center;
    padding: 60px 48px 80px;
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 56px;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -1px;
    max-width: 700px;
    margin: 0 auto 20px;
}

.hero p {
    font-family: 'Orbitron', sans-serif;
    font-size: 16px;
    color: #333;
    margin-bottom: 36px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-btns {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 60px;
}

.btn-dark {
    background: #111;
    color: #fff;
    border: none;
    padding: 12px 22px;
    font-family: 'Orbitron', sans-serif;
    font-size: 13px;
    font-weight: 500;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}

.btn-dark:hover {
    background: #333;
}

/* ── CAROUSEL ── */
.carousel-wrap {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 48px 150px;
    overflow: hidden;
    z-index: 2;
}

.carousel-track {
    display: flex;
    transition: transform 0.5s ease;
}

.carousel-slide {
    min-width: 100%;
    flex-shrink: 0;
    position: relative;
    border-radius: 12px;
    overflow: hidden;
}

.carousel-slide img {
    width: 100%;
    height: 440px;
    object-fit: cover;
    display: block;
    border-radius: 12px;
}

.carousel-caption-box {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.6));
    padding: 40px 24px 20px;
    border-radius: 0 0 12px 12px;
}

.carousel-caption-box p {
    font-family: 'Orbitron', sans-serif;
    font-size: 20px;
    font-weight: 500;
    color: #fff;
    margin: 0;
    text-align: center;
}

.carousel-btn {
    position: absolute;
    top: 35%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.8);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
    z-index: 3;
    color: #333;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.carousel-btn:hover {
    background: #fff;
}

.carousel-prev {
    left: 56px;
}

.carousel-next {
    right: 56px;
}

.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 16px;
}

.carousel-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(26, 82, 118, 0.3);
    border: none;
    cursor: pointer;
    padding: 0;
    transition: background 0.2s;
}

.carousel-dot.active {
    background: #1a5276;
}

/* ── FEATURES ── */
.features {
    padding: 80px 48px;
    background: rgba(255, 255, 255, 0.5);
    position: relative;
    z-index: 2;
}

.features h2 {
    font-family: 'Orbitron', sans-serif;
    font-size: 38px;
    font-weight: 700;
    text-align: center;
    max-width: 600px;
    margin: 0 auto 60px;
    line-height: 1.2;
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    max-width: 900px;
    margin: 0 auto;
    align-items: center;
}

.features-image {
    position: relative;
}

.features-image img {
    width: 100%;
    border-radius: 8px;
    display: block;
}

/* ── FEATURES CAROUSEL ── */
.features-carousel {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
}

.features-carousel-track {
    display: flex;
    transition: transform 0.5s ease;
}

.features-carousel-slide {
    min-width: 100%;
    position: relative;
}

.features-carousel-slide img {
    width: 100%;
    height: 340px;
    object-fit: cover;
    display: block;
    border-radius: 12px;
}

.features-carousel-info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.65));
    padding: 60px 20px 16px;
    border-radius: 0 0 12px 12px;
}

.features-carousel-info h4 {
    font-family: 'Orbitron', sans-serif;
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 6px;
}

.features-carousel-meta {
    display: flex;
    justify-content: space-between;
    font-family: 'Orbitron', sans-serif;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.8);
}

.fc-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.8);
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    font-size: 14px;
    cursor: pointer;
    z-index: 3;
    color: #333;
    display: flex;
    align-items: center;
    justify-content: center;
}

.fc-btn:hover {
    background: #fff;
}

.fc-prev {
    left: 10px;
}

.fc-next {
    right: 10px;
}

.fc-dots {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin-top: 12px;
}

.fc-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: rgba(26, 82, 118, 0.3);
    border: none;
    cursor: pointer;
    padding: 0;
}

.fc-dot.active {
    background: #1a5276;
}

.features-list {
    display: flex;
    flex-direction: column;
}

.feature-item {
    padding: 20px 0;
    border-bottom: 1px solid #e5e5e5;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 16px;
    align-items: start;
}

.feature-item:first-child {
    border-top: 1px solid #e5e5e5;
}

.feature-item h3 {
    font-family: 'Orbitron', sans-serif;
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 6px;
}

.feature-item p {
    font-family: 'Orbitron', sans-serif;
    font-size: 14px;
    color: #555;
    line-height: 1.5;
}

.feature-num {
    font-family: 'Orbitron', sans-serif;
    font-size: 11px;
    color: #aaa;
}

.features-btn {
    margin-top: 28px;
}

/* ── PRINCIPLES ── */
.principles {
    background: linear-gradient(180deg, rgba(158, 203, 231, 0.5) 0%, rgba(149, 178, 196, 0.5) 25%, rgba(226, 241, 252, 0.5) 50%, rgba(237, 246, 255, 0.5) 75%, rgba(186, 203, 219, 0.5) 100%);
    padding: 80px 48px;
    position: relative;
    z-index: 2;
}

.principles h3 {
    font-family: 'Orbitron', sans-serif;
    font-size: 16px;
    font-weight: 600;
    text-align: center;
    color: #4facfe;
    margin-bottom: 8px;
}

.principles h2 {
    font-family: 'Orbitron', sans-serif;
    font-size: 38px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
    line-height: 1.3;
}

.principles-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    max-width: 1100px;
    margin: 0 auto;
}

.principle-card {
    background: rgba(255, 255, 255, 0.7);
    border-radius: 12px;
    padding: 0;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
}

.principle-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 8px 24px rgba(79, 172, 254, 0.3);
    border-color: #4facfe;
}

.principle-img {
    width: 100%;
    height: 160px;
    overflow: hidden;
}

.principle-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.principle-card h3 {
    font-family: 'Orbitron', sans-serif;
    font-size: 15px;
    font-weight: 700;
    margin: 16px 20px 10px;
    text-align: left;
    color: #1a5276;
}

.principle-card h3 i {
    margin-right: 6px;
    color: #4facfe;
}

.principle-card ul {
    list-style: none;
    padding: 0 20px 20px;
    margin: 0;
}

.principle-card ul li {
    font-family: 'Orbitron', sans-serif;
    font-size: 13px;
    color: #555;
    line-height: 1.8;
    padding-left: 14px;
    position: relative;
}

.principle-card ul li::before {
    content: '·';
    position: absolute;
    left: 0;
    color: #4facfe;
    font-weight: 700;
}

/* ── CASE STUDY / 리뷰 ── */
.case-study {
    padding: 80px 48px;
    background: rgba(255, 255, 255, 0.5);
    position: relative;
    z-index: 2;
    text-align: center;
}

.case-study h3 {
    font-family: 'Orbitron', sans-serif;
    font-size: 16px;
    font-weight: 600;
    color: #4facfe;
    margin-bottom: 8px;
}

.case-study h2 {
    font-family: 'Orbitron', sans-serif;
    font-size: 38px;
    font-weight: 700;
    margin-bottom: 16px;
}

.case-study-desc {
    font-family: 'Orbitron', sans-serif;
    font-size: 14px;
    color: #666;
    max-width: 600px;
    margin: 0 auto 48px;
}

.review-carousel-wrap {
    position: relative;
    max-width: 750px;
    margin: 0 auto;
    padding: 0 40px;
    overflow: hidden;
}

.review-carousel-track {
    display: flex;
    transition: transform 0.5s ease;
}

.review-slide {
    min-width: 100%;
    flex-shrink: 0;
    padding: 0 12px;
}

.review-card {
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid #e8f0f8;
    border-radius: 16px;
    padding: 36px 32px;
    text-align: left;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.review-quote {
    display: none;
}

.review-text {
    font-family: 'Orbitron', sans-serif;
    font-size: 15px;
    color: #333;
    line-height: 1.7;
    margin-bottom: 24px;
}

.review-author {
    display: flex;
    align-items: center;
    gap: 14px;
}

.review-avatar {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid #4facfe;
}

.review-author strong {
    font-family: 'Orbitron', sans-serif;
    font-size: 15px;
    font-weight: 700;
    display: block;
    color: #111;
}

.review-author span {
    font-family: 'Orbitron', sans-serif;
    font-size: 12px;
    color: #888;
}

.review-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid #e0e0e0;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 16px;
    cursor: pointer;
    z-index: 3;
    color: #333;
    display: flex;
    align-items: center;
    justify-content: center;
}

.review-btn:hover {
    background: #fff;
}

.review-prev {
    left: 0;
}

.review-next {
    right: 0;
}

.review-dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 24px;
}

.review-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(26, 82, 118, 0.3);
    border: none;
    cursor: pointer;
    padding: 0;
}

.review-dot.active {
    background: #4facfe;
}

/* ── JOURNAL ── */
.journal {
    padding: 80px 48px;
    background: linear-gradient(180deg, rgba(158, 203, 231, 0.5) 0%, rgba(149, 178, 196, 0.5) 25%, rgba(226, 241, 252, 0.5) 50%, rgba(237, 246, 255, 0.5) 75%, rgba(186, 203, 219, 0.5) 100%);
    position: relative;
    z-index: 2;
}

.journal-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    max-width: 820px;
    margin: 0 auto 40px;
}

.journal-book {
    width: 100px;
    height: 100px;
    background: #c8e0f8;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transform: rotate(-8deg);
    flex-shrink: 0;
}

.journal-book::before {
    content: '';
    position: absolute;
    inset: 8px;
    border: 2px solid #5090c0;
    border-radius: 4px;
}

.journal-book-inner {
    text-align: center;
    z-index: 1;
}

.journal-book-inner .book-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 32px;
    font-weight: 700;
    color: #1a5080;
    line-height: 1.3;
}

.journal-book-inner .book-tags {
    font-family: 'Orbitron', sans-serif;
    font-size: 10px;
    color: #4080a0;
}

.journal h2 {
    font-family: 'Orbitron', sans-serif;
    font-size: 38px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 0;
}

.journal-articles {
    max-width: 820px;
    margin: 0 auto;
}

.article-item {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 20px;
    padding: 20px 0;
    border-top: 1px solid #e5e5e5;
    align-items: center;
}

.article-item:last-child {
    border-bottom: 1px solid #e5e5e5;
}

.article-thumb {
    width: 120px;
    height: 80px;
    border-radius: 6px;
    overflow: hidden;
    background: #ccc;
}

.article-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.thumb-sky1 {
    background: linear-gradient(160deg, #7ec8e3, #4facfe);
}

.thumb-sky2 {
    background: linear-gradient(160deg, #a8d8f0, #6bb8e0);
}

.thumb-sky3 {
    background: linear-gradient(160deg, #c4e4f8, #90c0e8);
}

.article-text h3 {
    font-family: 'Orbitron', sans-serif;
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 6px;
    line-height: 1.4;
}

.article-meta {
    font-family: 'Orbitron', sans-serif;
    font-size: 11px;
    color: #888;
}

.journal-btn {
    text-align: center;
    margin-top: 36px;
}

/* ── TESTIMONIAL ── */
.testimonial {
    padding: 80px 0;
    background: rgba(255, 255, 255, 0.5);
    display: grid;
    grid-template-columns: 1fr 1fr;
    max-width: 100%;
    overflow: hidden;
    position: relative;
    z-index: 2;
}

.testimonial-img {
    background: linear-gradient(160deg, #90c0f0, #4080c8);
    min-height: 360px;
    position: relative;
    overflow: hidden;
}

.person-blue {
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse 140px 200px at 50% 60%, #1a50a0 0%, transparent 80%),
        radial-gradient(ellipse 180px 260px at 50% 55%, #3070c0 0%, transparent 80%),
        linear-gradient(170deg, #aad0f8, #78aae0);
}

.testimonial-content {
    padding: 60px 48px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.quote-mark {
    font-family: 'Orbitron', sans-serif;
    font-size: 48px;
    color: #ccc;
    line-height: 1;
    margin-bottom: 16px;
}

.testimonial-content blockquote {
    font-family: 'Orbitron', sans-serif;
    font-size: 26px;
    font-weight: 700;
    line-height: 1.35;
    margin-bottom: 28px;
}

.testimonial-author strong {
    font-family: 'Orbitron', sans-serif;
    font-size: 15px;
    font-weight: 700;
    display: block;
}

.testimonial-author span {
    font-family: 'Orbitron', sans-serif;
    font-size: 12px;
    color: #666;
}

/* ── CTA ── */
.cta {
    background: #edf4ff;
    padding: 80px 48px;
    text-align: center;
    position: relative;
    z-index: 2;
}

.cta h2 {
    font-family: 'Orbitron', sans-serif;
    font-size: 30px;
    font-weight: 700;
    margin-bottom: 28px;
}

/* ── FOOTER ── */
footer {
    background: rgba(255, 255, 255, 0.5);
    padding: 24px 48px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    z-index: 2;
}

.footer-links {
    display: flex;
    gap: 28px;
    list-style: none;
}

.footer-links a {
    font-family: 'Orbitron', sans-serif;
    font-size: 20px;
    font-weight: 500;
    color: #1a5276;
    text-decoration: none;
}

.footer-links a:hover {
    text-decoration: underline;
}

.footer-copy {
    font-family: 'Orbitron', sans-serif;
    font-size: 14px;
    color: #5a8aa8;
}

.footer-wordmark {
    background: linear-gradient(180deg, rgba(158, 203, 231, 0.5) 0%, rgba(149, 178, 196, 0.5) 25%, rgba(226, 241, 252, 0.5) 50%, rgba(237, 246, 255, 0.5) 75%, rgba(186, 203, 219, 0.5) 100%);
    padding: 48px 48px 40px;
    position: relative;
    z-index: 2;
}

.footer-info {
    padding: 0 0 8px;
    text-align: center;
}

.footer-info-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0;
    font-family: 'Orbitron', sans-serif;
    font-size: 16px;
    color: #333;
    line-height: 2;
}

.footer-info-row a {
    color: #333;
    text-decoration: none;
}

.footer-info-row a:hover {
    color: #4facfe;
}

.footer-info-row a i {
    margin-right: 4px;
}

.footer-divider {
    margin: 0 10px;
    color: #999;
}

.footer-copyright {
    font-family: 'Orbitron', sans-serif;
    font-size: 14px;
    color: #666;
    margin-top: 12px;
}

/* ── LOGIN MODAL ── */
.signing-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.signing-overlay.active {
    display: flex;
}

.signing-modal {
    background: linear-gradient(160deg, #e8f4fd 0%, #d0eafc 50%, #b8dff8 100%);
    border-radius: 16px;
    width: 100%;
    max-width: 440px;
    padding: 40px 36px 32px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    position: relative;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.signing-modal .modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: none;
    border: none;
    font-size: 24px;
    color: #999;
    cursor: pointer;
    line-height: 1;
}

.signing-modal .modal-close:hover {
    color: #333;
}

.signing-modal h3 {
    font-family: 'Orbitron', sans-serif;
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 6px;
    color: #1a5276;
}

.signing-modal .modal-subtitle {
    font-size: 16px;
    color: #666;
    margin-bottom: 28px;
}

.signing-modal label {
    display: block;
    font-family: 'Orbitron', sans-serif;
    font-size: 16px;
    font-weight: 600;
    color: #1a5276;
    margin-bottom: 6px;
}

.signing-modal input[type="email"],
.signing-modal input[type="password"],
.signing-modal input[type="text"] {
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 8px;
    width: 100%;
    padding: 12px 14px;
    font-family: 'Orbitron', sans-serif;
    font-size: 14px;
    margin-bottom: 16px;
    transition: border-color 0.2s;
}

.signing-modal input:focus {
    outline: none;
    border-color: #4facfe;
    box-shadow: 0 0 0 3px rgba(79, 172, 254, 0.15);
}

.signing-modal .checkbox-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 20px;
    font-size: 16px;
    color: #666;
}

.btn-login-primary {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #4facfe, #3a8fd4);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-family: 'Orbitron', sans-serif;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: opacity 0.2s;
}

.btn-login-primary:hover {
    opacity: 0.9;
}

.signing-modal .divider {
    display: flex;
    align-items: center;
    gap: 14px;
    margin: 24px 0;
    color: #5a9cc0;
    font-size: 12px;
}

.signing-modal .divider::before,
.signing-modal .divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: rgba(90, 156, 192, 0.3);
}

.social-login-btns {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.btn-social {
    width: 100%;
    padding: 12px;
    border: 1px solid #e5e5e5;
    border-radius: 8px;
    font-family: 'Orbitron', sans-serif;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: background 0.2s;
}

.btn-social:hover {
    background: #f8f8f8;
}

.btn-naver {
    background: #03C75A;
    color: #fff;
    border-color: #03C75A;
}

.btn-naver:hover {
    background: #02b351;
}

.btn-kakao {
    background: #FEE500;
    color: #111;
    border-color: #FEE500;
}

.btn-kakao:hover {
    background: #f0d900;
}

.btn-social img {
    width: 22px;
    height: 22px;
}

.signing-modal .modal-footer-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.4);
}

.signing-modal .modal-footer-row button {
    background: none;
    border: none;
    font-family: 'Orbitron', sans-serif;
    font-size: 13px;
    color: #1a5276;
    cursor: pointer;
    font-weight: 500;
}

.signing-modal .modal-footer-row button:hover {
    text-decoration: underline;
}

/* 회원가입 폼 (기본 숨김) */
.signup-form {
    display: none;
}

.signup-form.active {
    display: block;
}

.signin-form.hidden {
    display: none;
}

/* 개발자센터 dev 등록 활성화때까지 임시 사용 */
.btn-social:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    pointer-events: none;
}

/* ── SCROLL TO TOP ── */
.scroll-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, #819db6, #6ca0ca);
    color: #fff;
    border: none;
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px rgba(79,172,254,0.4);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s, transform 0.3s;
    z-index: 99;
    transform: translateY(10px);
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-top:hover {
    background: linear-gradient(135deg, #5f8cb1, #4580b1);
    box-shadow: 0 6px 20px rgba(79,172,254,0.5);
}

/* 항목 클릭 후 이동 시 이벤트 추가 */
html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}