/*
 * Layout CSS — Container, Grids, Header, Footer
 */

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    width: 100%;
}

/* Sections */
.section {
    padding: var(--space-section) 0;
}

/* Grids */
.grid {
    display: grid;
    gap: var(--space-lg);
}

/* Mobile-first: Default 1 column */
.grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
}

/* Tablet (>= 768px) */
@media (min-width: 768px) {
    .grid-2 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Desktop (>= 1024px) */
@media (min-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(4, 1fr);
    }
    .section {
        padding: 160px 0;
    }
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--bg-primary);
    border-bottom: 1px solid transparent;
    transition: all var(--duration-base) var(--easing-default);
}
.site-header.is-scrolled {
    background-color: rgba(255, 255, 255, 0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}
[data-theme="dark"] .site-header.is-scrolled {
    background-color: rgba(10, 15, 28, 0.78);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
    transition: height var(--duration-base) var(--easing-default);
}
.site-header.is-scrolled .header-container {
    height: 64px; /* 스크롤 시 헤더 높이 축소 */
}

.site-title {
    font-size: 1.5rem;
    font-family: var(--font-heading);
    font-weight: 900;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    position: relative;
    z-index: 101; /* 모바일 오버레이보다 위에 위치 */
}

/* Theme Toggle Button */
.theme-toggle {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1.25rem;
    padding: 8px;
    border-radius: var(--rounded-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: background-color var(--duration-fast);
}
.theme-toggle:hover {
    background-color: var(--bg-surface-hover);
}
[data-theme="dark"] .icon-dark { display: none; }
[data-theme="dark"] .icon-light { display: inline-block; }
[data-theme="light"] .icon-light { display: none; }
[data-theme="light"] .icon-dark { display: inline-block; }


/* Desktop Navigation (기본 숨김 -> Desktop에서 표시) */
.main-navigation {
    display: none;
}
.main-navigation ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--space-lg);
}
.main-navigation a {
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}
.main-navigation a:hover {
    color: var(--accent);
}
.main-navigation .current-menu-item > a,
.main-navigation .current_page_item > a {
    color: var(--accent);
    position: relative;
}
.main-navigation .current-menu-item > a::after,
.main-navigation .current_page_item > a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    border-radius: 1px;
}

/* Header CTA Button */
.header-cta {
    display: none;
    padding: 6px 16px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--on-accent);
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: var(--rounded-full);
    transition: transform var(--duration-fast), box-shadow var(--duration-fast);
    white-space: nowrap;
}
.header-cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(var(--accent-rgb), 0.3);
    color: var(--on-accent);
}
@media (min-width: 768px) {
    .header-cta { display: inline-block; }
}

@media (min-width: 768px) {
    .main-navigation {
        display: block;
    }
}

/* ==========================================================================
   Mobile Menu (Hamburger & Overlay)
   ========================================================================== */
.hamburger {
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 101;
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 10px;
    transition: all 0.3s linear;
    position: relative;
    transform-origin: 1px;
}

/* Hamburger Animation (is-menu-open 상태) */
html.is-menu-open .hamburger-line:first-child {
    transform: rotate(45deg);
}
html.is-menu-open .hamburger-line:nth-child(2) {
    opacity: 0;
    transform: translateX(20px);
}
html.is-menu-open .hamburger-line:nth-child(3) {
    transform: rotate(-45deg);
}

@media (min-width: 768px) {
    .hamburger {
        display: none;
    }
}

/* Mobile Overlay */
.mobile-navigation-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--bg-primary);
    z-index: 90;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration-base) var(--easing-default), visibility var(--duration-base);
}

html.is-menu-open .mobile-navigation-overlay {
    opacity: 1;
    visibility: visible;
}

.mobile-menu-container ul {
    list-style: none;
    padding: 0;
    margin: 0;
    text-align: center;
}
.mobile-menu-container li {
    margin-bottom: var(--space-lg);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

html.is-menu-open .mobile-menu-container li {
    opacity: 1;
    transform: translateY(0);
}
/* Staggered animation for menu items */
html.is-menu-open .mobile-menu-container li:nth-child(1) { transition-delay: 0.1s; }
html.is-menu-open .mobile-menu-container li:nth-child(2) { transition-delay: 0.15s; }
html.is-menu-open .mobile-menu-container li:nth-child(3) { transition-delay: 0.2s; }
html.is-menu-open .mobile-menu-container li:nth-child(4) { transition-delay: 0.25s; }

.mobile-menu-container a {
    font-size: 2rem;
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}
.mobile-menu-container a:active,
.mobile-menu-container a:hover {
    color: var(--accent);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
    padding: var(--space-2xl) 0;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border);
    margin-top: auto;
}

.footer-grid {
    margin-bottom: var(--space-2xl);
}

.footer-widget h3 {
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.footer-widget ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.footer-widget li {
    margin-bottom: var(--space-sm);
}
.footer-widget a {
    color: var(--text-secondary);
    transition: color var(--duration-fast), padding-left var(--duration-fast);
    position: relative;
    display: inline-block;
}
.footer-widget a::before {
    content: '→';
    position: absolute;
    left: -4px;
    opacity: 0;
    font-size: 0.75em;
    transition: opacity var(--duration-fast), left var(--duration-fast);
}
.footer-widget a:hover {
    color: var(--accent);
    padding-left: 14px;
}
.footer-widget a:hover::before {
    opacity: 1;
    left: 0;
}

/* Business Info */
.business-info {
    list-style: none;
    padding: 0;
    margin: 0;
}
.business-info li {
    margin-bottom: var(--space-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}
.business-info .label {
    display: block;
    font-size: 0.7rem;
    margin-bottom: 2px;
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    border-radius: var(--rounded-full);
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: var(--on-accent);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--duration-base) var(--easing-default);
    box-shadow: 0 4px 14px rgba(var(--accent-rgb), 0.3);
    z-index: 50;
}
.back-to-top.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(var(--accent-rgb), 0.4);
}

.site-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border);
}
.site-info p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.legal-links {
    display: flex;
    gap: var(--space-md);
}
.legal-links a {
    font-size: 0.875rem;
    color: var(--text-muted);
}
.legal-links a:hover {
    color: var(--accent);
}

/* ==========================================================================
   Mobile Responsive (M-3, M-9, M-12)
   ========================================================================== */
@media (max-width: 767px) {
    /* M-12: 컨테이너 패딩 축소 */
    .container {
        padding: 0 var(--space-md);
    }

    /* M-9: 섹션 패딩 축소 */
    .section {
        padding: 80px 0;
    }

    /* M-3: Back to Top 모바일 */
    .back-to-top {
        bottom: 20px;
        right: 16px;
        width: 40px;
        height: 40px;
    }

    /* 푸터 3칼럼 → 1칼럼 */
    .footer-grid.grid-3 {
        grid-template-columns: 1fr;
    }

    /* 사이트 정보 세로 정렬 */
    .site-info {
        flex-direction: column;
        text-align: center;
    }
}