/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

ul, ol, li {
    list-style: none;
}

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

img {
    max-width: 100%;
    display: block;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

:root {
    --color-point: #45B2CF;
    --color-point-rgb: 69, 178, 207;
    --color-point-dark: #3899b5;
    --color-point-light: #6ec8de;
    --color-navy: #0a2d6e;
    --color-navy-dark: #061e4d;
    --color-navy-mid: #1a4a9e;
    --color-blue: #1e5bb8;
    --color-blue-light: #3d7fd4;
    --color-mint: #b8e4dc;
    --color-mint-dark: #8fd4c8;
    --color-sky: #d4eaf8;
    --color-white: #ffffff;
    --color-black: #111111;
    --color-gray-100: #f5f7fa;
    --color-gray-200: #e8ecf2;
    --color-gray-300: #d0d6e0;
    --color-gray-400: #9aa3b2;
    --color-gray-600: #5c6678;
    --color-text: #222222;
    --font-sans: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --container-width: 1320px;
    
    /* 시원한 비율 유지형 유동 여백 체계 (Fluid Spacing System) */
    --section-padding: clamp(72px, 7.5vw, 120px);
    --section-header-margin: clamp(48px, 5vw, 80px);
    --element-gap: clamp(28px, 3.5vw, 56px);
    --section-divider: rgba(255, 255, 255, 0.18);
    --transition: 0.25s ease;
}

html,
body {
    overflow-x: clip;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    color: rgba(255, 255, 255, 0.88);
    line-height: 1.6;
    letter-spacing: -0.02em;
    background: #000000;
}

/* Layout */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
}

.section {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    opacity: 1;
    transform: none;
    transition:
        opacity 0.9s cubic-bezier(0.22, 1, 0.36, 1),
        transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}

.section.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.site-footer {
    opacity: 1;
    transform: none;
    transition:
        opacity 0.9s cubic-bezier(0.22, 1, 0.36, 1),
        transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}

.site-footer.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    .section,
    .site-footer {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* Section Header (공통) */
.section-header {
    text-align: center;
    margin-bottom: var(--section-header-margin, clamp(36px, 4vw, 64px));
}

.section-header__label {
    display: block;
    margin-bottom: 12px;
    font-size: 16px;
    font-weight: 500;
    color: rgba(69, 178, 207, 0.85);
    letter-spacing: -0.01em;
}

.section-header__title {
    font-size: 58px;
    font-weight: 700;
    color: var(--color-white);
    line-height: 1.2;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
}

.section-header__action {
    margin-top: 20px;
}

.section-header--with-action {
    position: relative;
}

.section-header--with-action .section-header__action {
    position: absolute;
    top: 0;
    right: 0;
    margin-top: 0;
}

/* Buttons (공통) */
.btn-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 22px;
    font-size: 16px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.72);
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 999px;
    transition: border-color var(--transition), color var(--transition), background var(--transition);
}

.btn-pill:hover {
    border-color: var(--color-point);
    color: var(--color-point);
}

.btn-pill__icon {
    font-size: 16px;
    line-height: 1;
    font-weight: 400;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 15px;
    font-weight: 600;
    color: var(--color-white);
    background: var(--color-point);
    border-radius: 4px;
    transition: background var(--transition);
}

.btn-primary:hover {
    background: var(--color-point-dark);
}

.btn-primary__arrow {
    font-size: 15px;
    opacity: 0.9;
}

/* Carousel Nav (공통) */
.carousel-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.carousel-nav__btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.75);
    background: rgba(255, 255, 255, 0.05);
    font-size: 28px;
    line-height: 1;
    transition: border-color var(--transition), color var(--transition), background var(--transition);
}

.carousel-nav__btn .bi {
    display: block;
    line-height: 1;
}

.carousel-nav__btn:hover {
    border-color: var(--color-point);
    color: var(--color-point);
}

.carousel-nav__btn--lg {
    width: 56px;
    height: 56px;
    border-color: rgba(255, 255, 255, 0.35);
    color: rgba(255, 255, 255, 0.85);
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(6px);
}

.carousel-nav__btn--lg:hover {
    border-color: rgba(255, 255, 255, 0.6);
    color: var(--color-white);
    background: rgba(255, 255, 255, 0.14);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Site Header (공통) */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.28);
    transition: background var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.site-header.is-scrolled {
    background: rgba(0, 0, 0, 0.9);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.08);
    border-bottom-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(12px);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    height: 120px;
    transition: background var(--transition), color var(--transition);
}

.site-header__logo {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.site-header__logo-img {
    display: block;
    height: 70px;
    width: auto;
    object-fit: contain;
    filter: brightness(0) invert(1);
    transition: filter var(--transition);
}

.site-header.is-scrolled .site-header__logo-img {
    filter: brightness(0) invert(1);
}

.site-header__nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.site-header__nav-list {
    display: flex;
    align-items: center;
    gap: 40px;
}

.site-header__nav-list a {
    font-size: 18px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.95);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.85);
    white-space: nowrap;
    transition: color var(--transition), text-shadow var(--transition);
}

.site-header__nav-list a:hover,
.site-header__nav-list a.is-active {
    color: var(--color-white);
}

.site-header.is-scrolled .site-header__nav-list a {
    color: rgba(255, 255, 255, 0.9);
}

.site-header.is-scrolled .site-header__nav-list a:hover,
.site-header.is-scrolled .site-header__nav-list a.is-active {
    color: var(--color-point);
}

.site-header__actions {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: 12px;
}

.site-header__language-switch {
    position: relative;
    display: inline-grid;
    grid-template-columns: repeat(2, 38px);
    flex-shrink: 0;
    padding: 3px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.36);
    border-radius: 999px;
}

.site-header__language-switch::before {
    content: "";
    position: absolute;
    top: 3px;
    left: 3px;
    width: 38px;
    height: 32px;
    background: var(--color-white);
    border-radius: 999px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.24);
    transition: transform var(--transition);
}

.site-header__language-switch.is-en::before {
    transform: translateX(100%);
}

.site-header__language-option {
    position: relative;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 32px;
    font-size: 13px;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.62);
    border-radius: 999px;
    transition: color var(--transition);
}

.site-header__language-option:hover,
.site-header__language-option:focus-visible {
    color: var(--color-white);
}

.site-header__language-option.is-active {
    color: #000;
}

.site-header__language-option:focus-visible {
    outline: 2px solid var(--color-white);
    outline-offset: 2px;
}

.site-header__lang {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    padding: 8px 14px;
    font-size: 15px;
    font-weight: 700;
    color: var(--color-white);
    border: 1px solid rgba(255, 255, 255, 0.45);
    border-radius: 4px;
    transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.site-header__lang:hover {
    background: rgba(255, 255, 255, 0.12);
}

.site-header.is-scrolled .site-header__lang {
    color: var(--color-white);
    border-color: rgba(255, 255, 255, 0.45);
}

.site-header.is-scrolled .site-header__lang:hover {
    background: rgba(255, 255, 255, 0.12);
}

@media (min-width: 1025px) {
    .site-header__admin-login {
        margin-left: 8px;
        border-radius: 999px;
    }
}

.site-header__menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 8px;
}

.site-header__menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-white);
    border-radius: 1px;
    transition: background var(--transition);
}

.site-header.is-scrolled .site-header__menu-btn span {
    background: var(--color-white);
}

@media (max-width: 1100px) {
    .site-header__nav {
        display: none;
    }

    .site-header__menu-btn {
        display: flex;
    }
}

@media (max-width: 1024px) {
    :root {
        --section-padding: 80px;
    }

    .container {
        padding-left: 20px;
        padding-right: 20px;
    }

    .section-header__title {
        font-size: 36px;
    }
}

@media (max-width: 768px) {
    .section-header--with-action .section-header__action {
        position: static;
        margin-top: 20px;
    }
}

@media (max-width: 640px) {
    :root {
        --section-padding: 64px;
    }

    .section-header {
        margin-bottom: 40px;
    }

    .section-header__title {
        font-size: 28px;
    }
}