/* ============================================================
   Layout — layout.css
   導覽列、頁尾、容器、Grid、Page Banner、Breadcrumb
   ============================================================ */

/* ── Container ── */
.container {
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--container-px);
}

/* ── Section 通用間距 ── */
.section {
    padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}

.section--alt {
    background-color: var(--color-neutral-100);
}

.section--dark {
    background-color: var(--color-primary-900);
    color: #fff;
}

/* ── Grid 系統 ── */
.grid {
    display: grid;
    gap: var(--space-6);
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 1023px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 767px) {

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
}

/* ──────────────────────────────────
   NAVBAR
────────────────────────────────── */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--navbar-height);
    background-color: var(--color-primary-900);
    transition: background var(--duration-slow) var(--ease-out),
        box-shadow var(--duration-slow) var(--ease-out);
}

.navbar.scrolled {
    background: rgba(11, 37, 69, 0.93);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    box-shadow: 0 2px 24px rgba(0, 0, 0, 0.35);
}

.navbar__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* Brand */
.navbar__brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    flex-shrink: 0;
}

.navbar__logo {
    height: 44px;
    width: 44px;
    object-fit: contain;
    filter: drop-shadow(0 1px 3px rgba(0, 0, 0, .3));
}

.navbar__name {
    font-family: var(--font-serif);
    font-size: var(--text-sm);
    font-weight: 700;
    color: #fff;
    line-height: 1.3;
    max-width: 200px;
}

.navbar__abbr {
    font-family: var(--font-en);
    font-size: var(--text-xs);
    color: var(--color-accent-300);
    letter-spacing: 1px;
}

/* Desktop Nav */
.navbar__nav {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-2) var(--space-3);
    color: rgba(255, 255, 255, 0.88);
    font-size: var(--text-sm);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: color var(--duration-normal), background var(--duration-normal);
    white-space: nowrap;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: var(--space-3);
    right: var(--space-3);
    height: 2px;
    background: var(--color-accent-400, var(--color-accent-500));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--duration-normal) var(--ease-out);
    border-radius: 1px;
}

.nav-link:hover,
.nav-link.active {
    color: #fff;
}

.nav-link:hover::after,
.nav-link.active::after {
    transform: scaleX(1);
}

/* Dropdown */
.nav-item--has-dropdown:hover .dropdown {
    opacity: 1;
    pointer-events: all;
    transform: translateY(0);
}

.nav-item--has-dropdown::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 8px;
    background: transparent;
    z-index: 99;
    /* 確保感應區在最上層 */
}

.dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    min-width: 180px;
    background: var(--color-primary-800);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-6px);
    transition: opacity var(--duration-normal) var(--ease-out),
        transform var(--duration-normal) var(--ease-out);
}

.dropdown a {
    display: block;
    padding: var(--space-3) var(--space-4);
    color: rgba(255, 255, 255, .85);
    font-size: var(--text-sm);
    transition: background var(--duration-fast), color var(--duration-fast);
}

.dropdown a:hover {
    background: rgba(255, 255, 255, .08);
    color: var(--color-accent-300);
}

/* Member CTA */
.navbar__cta {
    padding: var(--space-2) var(--space-4);
    border: 1.5px solid var(--color-accent-500);
    color: var(--color-accent-400, var(--color-accent-500));
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 600;
    transition: all var(--duration-normal);
    white-space: nowrap;
    margin-left: var(--space-4);
}

.navbar__cta:hover {
    background: var(--color-accent-500);
    color: var(--color-primary-900);
}

/* Hamburger */
.navbar__hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.navbar__hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: transform var(--duration-normal), opacity var(--duration-normal);
}

.navbar__hamburger.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.navbar__hamburger.open span:nth-child(2) {
    opacity: 0;
}

.navbar__hamburger.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu */
.navbar__mobile-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: min(320px, 85vw);
    height: 100dvh;
    background: var(--color-primary-900);
    overflow-y: auto;
    z-index: 999;
    padding: calc(var(--navbar-height) + var(--space-4)) var(--space-6) var(--space-8);
    transform: translateX(100%);
    transition: transform var(--duration-slow) var(--ease-in-out);
    box-shadow: -8px 0 32px rgba(0, 0, 0, .4);
}

.navbar__mobile-menu.open {
    transform: translateX(0);
}

.mobile-nav-link {
    display: block;
    padding: var(--space-3) 0;
    color: rgba(255, 255, 255, .88);
    font-size: var(--text-lg);
    border-bottom: 1px solid rgba(255, 255, 255, .08);
    transition: color var(--duration-fast);
}

.mobile-nav-link:hover {
    color: var(--color-accent-300);
}

.mobile-sub-links {
    padding-left: var(--space-4);
    margin-top: var(--space-1);
}

.mobile-sub-links a {
    display: block;
    padding: var(--space-2) 0;
    color: rgba(255, 255, 255, .6);
    font-size: var(--text-base);
    transition: color var(--duration-fast);
}

.mobile-sub-links a:hover {
    color: var(--color-accent-300);
}

.mobile-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, .5);
    z-index: 998;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-slow);
}

.mobile-overlay.open {
    opacity: 1;
    pointer-events: all;
}

/* ──────────────────────────────────
   PAGE BANNER
────────────────────────────────── */
.page-banner {
    background: linear-gradient(135deg, var(--color-primary-900) 0%, var(--color-primary-700) 100%);
    padding: clamp(var(--space-10), 8vw, var(--space-16)) 0;
    position: relative;
    overflow: hidden;
}

.page-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 80% 50%, rgba(212, 160, 23, 0.12) 0%, transparent 60%),
        radial-gradient(ellipse at 20% 80%, rgba(74, 154, 196, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.page-banner__title {
    font-family: var(--font-serif);
    font-size: clamp(var(--text-3xl), 5vw, var(--text-4xl));
    color: #fff;
    margin-top: var(--space-3);
    position: relative;
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.breadcrumb a {
    color: rgba(255, 255, 255, .65);
    font-size: var(--text-sm);
    transition: color var(--duration-fast);
}

.breadcrumb a:hover {
    color: var(--color-accent-300);
}

.breadcrumb span[aria-hidden] {
    color: rgba(255, 255, 255, .35);
}

.breadcrumb .current {
    color: rgba(255, 255, 255, .9);
    font-size: var(--text-sm);
}

/* ──────────────────────────────────
   FOOTER
────────────────────────────────── */
.footer {
    background-color: var(--color-primary-900);
    color: rgba(255, 255, 255, .75);
    padding-top: clamp(var(--space-12), 6vw, var(--space-20));
}

.footer__main {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: var(--space-10);
    padding-bottom: var(--space-10);
}

.footer__brand-name {
    font-family: var(--font-serif);
    font-size: var(--text-lg);
    color: #fff;
    line-height: 1.4;
    margin-bottom: var(--space-3);
}

.footer__slogan {
    font-size: var(--text-sm);
    line-height: 1.7;
    margin-bottom: var(--space-5);
    color: rgba(255, 255, 255, .6);
}

.footer__logo {
    height: 50px;
    width: auto;
    margin-bottom: var(--space-4);
    filter: brightness(0) invert(1) opacity(.8);
}

.footer__col-title {
    font-family: var(--font-en);
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--color-accent-300);
    margin-bottom: var(--space-5);
}

.footer__links {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer__links a {
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, .65);
    transition: color var(--duration-fast);
}

.footer__links a:hover {
    color: var(--color-accent-300);
}

.footer__contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, .65);
    margin-bottom: var(--space-3);
}

.footer__contact-icon {
    font-size: 1rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.footer__social {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-2);
}

.footer__social a {
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, .08);
    color: rgba(255, 255, 255, .7);
    font-size: 1.1rem;
    transition: all var(--duration-normal);
}

.footer__social a:hover {
    background: var(--color-accent-500);
    color: var(--color-primary-900);
    transform: translateY(-2px);
}

.footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, .08);
    padding: var(--space-5) 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-3);
}

.footer__copyright {
    font-size: var(--text-xs);
    color: rgba(255, 255, 255, .4);
}

/* ── Back to Top ── */
.back-to-top {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    width: 44px;
    height: 44px;
    background: var(--color-primary-600);
    color: #fff;
    border-radius: var(--radius-full);
    font-size: 1.1rem;
    display: grid;
    place-items: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    pointer-events: none;
    transform: translateY(12px);
    transition: all var(--duration-normal) var(--ease-out);
    z-index: 900;
}

.back-to-top.visible {
    opacity: 1;
    pointer-events: all;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-primary-800);
    transform: translateY(-2px);
}

/* ── Responsive Footer ── */
@media (max-width: 1023px) {
    .footer__main {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-8);
    }
}

@media (max-width: 767px) {
    .footer__main {
        grid-template-columns: 1fr;
    }

    .navbar__nav,
    .navbar__cta {
        display: none;
    }

    .navbar__hamburger {
        display: flex;
    }

    .footer__bottom {
        flex-direction: column;
        text-align: center;
    }
}