/* ===================================
   Kaiyi International - Main CSS
   Color: Black, White, Gold
   =================================== */

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

:root {
    --gold: #C9A961;
    --gold-dark: #9F7E3C;
    --black: #0A0A0A;
    --charcoal: #1C1C1C;
    --gray: #666666;
    --white: #FFFFFF;
    --cream: #F8F6F0;
    /* 標題裝飾字體：Cinzel 無越南文字形，預設拉丁語系用 Cinzel */
    --font-display: 'Cinzel', serif;
}

/* 越南文標題改用支援越南文 subset 的 Cormorant Garamond，
   避免變音字元（ế ữ ơ ặ…）在 Cinzel 缺字形時掉回預設 serif 造成字體混雜 */
html[lang="vi"] {
    --font-display: 'Cormorant Garamond', serif;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans TC', sans-serif;
    color: var(--charcoal);
    line-height: 1.7;
}

/* ===== PAGE LOADER ===== */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--black);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loader.fade-out {
    opacity: 0;
    visibility: hidden;
}

.loader-logo {
    font-family: var(--font-display);
    font-size: 3rem;
    color: var(--gold);
    font-weight: 700;
    letter-spacing: 0.15em;
    margin-bottom: 2rem;
    animation: logoFade 1.5s ease-in-out infinite;
}

.loader-spinner {
    width: 60px;
    height: 60px;
    border: 3px solid rgba(201, 169, 97, 0.2);
    border-top-color: var(--gold);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loader-text {
    color: var(--cream);
    font-size: 0.9rem;
    letter-spacing: 0.15em;
    margin-top: 1.5rem;
    opacity: 0.7;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes logoFade {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.6;
        transform: scale(1.05);
    }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ===== NAVIGATION ===== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--gold);
}

.nav-container {
    max-width: none;
    width: 100%;
    margin: 0 auto;
    padding: 0.7rem 3.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    text-decoration: none;
}

.logo .logo-text {
    display: flex;
    flex-direction: column;
    text-decoration: none;
}

.logo-text span,
.logo-text a {
    text-decoration: none;
}

.logo span {
    text-decoration: none;
}

.logo:hover span {
    text-decoration: none;
}

.logo img {
    width: auto; /* 覆蓋 HTML width 屬性（該屬性僅供載入前推算比例，避免 CLS） */
    height: 42px;
    background-color: #fff;
    border-radius: 50%;
}

.logo-main {
    font-family: var(--font-display);
    font-size: 1.65rem;
    color: var(--gold);
    /* color: var(--white); */
    font-weight: 700;
    letter-spacing: 0.1em;
    line-height: normal;
}

.logo-sub {
    font-size: 0.7rem;
    color: var(--white);
    letter-spacing: 0.2em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-menu > li {
    position: relative;
}

.nav-link {
    color: var(--white);
    text-decoration: none;
    font-size: 1.05rem;
    font-weight: 500;
    position: relative;
    transition: color 0.3s;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--gold);
    transition: width 0.3s;
}

.nav-link:hover, .nav-link.active {
    color: var(--gold);
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

/* Dropdown icon */
.nav-link .dropdown-icon {
    font-size: 0.7rem;
    transition: transform 0.3s;
}

.nav-menu > li:hover .dropdown-icon {
    transform: rotate(180deg);
}

/* Dropdown Menu */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    margin-top: 1.5rem;
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(10px);
    min-width: 280px;
    border: 1px solid var(--gold);
    border-radius: 4px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 100;
    padding: 1rem 0;
}

.nav-menu > li:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    margin-top: 1rem;
}

.dropdown-menu::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 8px 8px 8px;
    border-color: transparent transparent var(--gold) transparent;
}

.dropdown-item {
    display: block;
    padding: 0.75rem 1.5rem;
    color: var(--cream);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.3s;
    position: relative;
    border-left: 3px solid transparent;
}

.dropdown-item:hover {
    background: rgba(201, 169, 97, 0.1);
    color: var(--gold);
    border-left-color: var(--gold);
    padding-left: 1.75rem;
}

.dropdown-item i {
    margin-right: 0.75rem;
    width: 20px;
    text-align: center;
    color: var(--gold);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.mobile-toggle span {
    width: 25px;
    height: 2px;
    background: var(--gold);
}

/* ===== HERO ===== */
.hero {
    height: 100vh;
    height: 100svh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.hero-video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(10,10,10,0.8), rgba(28,28,28,0.7));
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 1040px;
    padding: 0 2rem;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.25rem, 4vw + 1.25rem, 5rem);
    color: var(--white);
    margin-bottom: 1.5rem;
    font-weight: 600;
    line-height: 1.2;
}

.text-gold {
    color: var(--gold);
}

.hero-subtitle {
    color: var(--cream);
    font-size: clamp(1rem, 1.5vw + 0.5rem, 1.4rem);
    margin-bottom: 2.5rem;
    letter-spacing: 0.1em;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    text-decoration: none;
    border: 2px solid;
    transition: all 0.3s;
}

.btn-primary {
    background: var(--gold);
    border-color: var(--gold);
    color: var(--black);
}

.btn-primary:hover {
    background: transparent;
    color: var(--gold);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    border-color: var(--white);
    color: var(--white);
}

.btn-outline:hover {
    background: var(--white);
    color: var(--black);
}

.btn-lg {
    padding: 1.25rem 3rem;
}

/* ===== SECTIONS ===== */
.section {
    padding: 5rem 2rem;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-subtitle {
    font-size: 0.85rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 1rem;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 2.5vw + 1rem, 3rem);
    color: var(--black);
    line-height: 1.25;
}

/* ===== OFFSET BORDER EFFECTS - 已移至各頁面專屬 CSS ===== */

/* ===== FEATURES ===== */
.features-section {
    background: var(--cream);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--white);
    padding: 3rem 2rem;
    text-align: center;
    border: 1px solid #E8E8E8;
    transition: all 0.4s ease;
    position: relative;
}

/* 樣式 3: 雙層邊框效果 - 首頁特色卡片 */
.feature-card::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 10px;
    right: 10px;
    bottom: 10px;
    border: 1px solid var(--gold);
    opacity: 0;
    transition: all 0.4s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    border-color: var(--gold);
}

.feature-card:hover::before {
    opacity: 0.5;
}

.feature-icon {
    font-size: 3rem;
    color: var(--gold);
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: var(--black);
}

.feature-card p {
    color: var(--gray);
    line-height: 1.8;
}

/* ===== CTA SECTION ===== */
.cta-section {
    position: relative;
    padding: 8rem 2rem;
    text-align: center;
}

.cta-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
}

.cta-overlay {
    position: absolute;
    inset: 0;
    background: rgba(10,10,10,0.85);
}

.cta-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
    margin: 0 auto;
}

.cta-content h2 {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 2.5vw + 1rem, 3rem);
    color: var(--white);
    margin-bottom: 1.5rem;
    line-height: 1.25;
}

.cta-content p {
    color: var(--cream);
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--black);
    color: var(--cream);
    padding: 4rem 2rem 2rem;
    border-top: 2px solid var(--gold);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-col h4 {
    color: var(--gold);
    margin-bottom: 1.5rem;
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: 0.75rem;
}

.footer-col a {
    color: var(--cream);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-col a:hover {
    color: var(--gold);
}

/* Footer contact list — gold icons aligned with text, wrapped lines hang under the text */
.footer-contact {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.footer-contact span {
    display: flex;
    align-items: flex-start;
    gap: 0.7em;
    line-height: 1.6;
}

.footer-contact span i {
    flex-shrink: 0;
    width: 1.1em;
    margin-top: 0.3em;
    color: var(--gold);
    font-size: 0.95em;
    text-align: center;
}

/* Footer phone (tel:) links — match cream text, override iOS Safari default blue */
.footer-col p a {
    color: var(--cream);
    -webkit-text-fill-color: var(--cream);
    text-decoration: none;
    transition: color 0.3s, -webkit-text-fill-color 0.3s;
}

.footer-col p a:hover {
    color: var(--gold);
    -webkit-text-fill-color: var(--gold);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(201,169,97,0.2);
    color: var(--gray);
    font-size: 0.9rem;
}

/* ===== BACK TO TOP ===== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--gold);
    color: var(--black);
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--gold-dark);
    transform: translateY(-5px);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    /* 減少手機版邊距 */
    .container {
        padding: 0 1.25rem;
    }

    .section {
        padding: 4rem 1.25rem;
    }

    .nav-container {
        padding: 0.7rem 1.25rem;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        flex-direction: column;
        background: rgba(10,10,10,0.98);
        width: 100%;
        padding: 0 2rem;
        gap: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.35s ease, padding 0.35s ease;
    }

    .nav-menu > li {
        width: 100%;
        border-bottom: 1px solid rgba(201, 169, 97, 0.2);
    }

    .nav-link {
        padding: 1rem 0;
        width: 100%;
        justify-content: space-between;
    }

    .nav-link::after {
        display: none;
    }

    /* 語系項目：globe + 文字靠左成一組，chevron 推到最右與其他項一致 */
    .lang-switcher > .nav-link {
        justify-content: flex-start;
    }

    .lang-switcher > .nav-link .dropdown-icon {
        margin-left: auto;
    }

    /* 手機版下拉選單 */
    .dropdown-menu {
        position: static;
        transform: none;
        margin: 0;
        padding: 0;
        border: none;
        border-radius: 0;
        background: transparent;
        opacity: 1;
        visibility: visible;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }

    .nav-menu > li.dropdown-active .dropdown-menu {
        max-height: 400px;
    }

    .dropdown-menu::before {
        display: none;
    }

    .dropdown-item {
        padding: 0.85rem 1rem 0.85rem 2rem;
        border-left: none;
        background: rgba(201, 169, 97, 0.05);
    }

    .dropdown-item:hover {
        padding-left: 2.5rem;
        background: rgba(201, 169, 97, 0.15);
    }

    .nav-menu > li:hover .dropdown-menu {
        opacity: 1;
        visibility: visible;
        margin-top: 0;
    }

    .dropdown-icon {
        transition: transform 0.3s;
    }

    .nav-menu > li.dropdown-active .dropdown-icon {
        transform: rotate(180deg);
    }

    .nav-menu.active {
        max-height: calc(100dvh - 64px);
        padding: 2rem;
        overflow-y: auto;
    }

    .mobile-toggle {
        display: flex;
    }

    .hero-content {
        padding: 0 1.25rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .cta-section {
        padding: 6rem 1.25rem;
    }

    .footer {
        padding: 3rem 1.25rem 2rem;
    }
}

@media (max-width: 480px) {
    /* 更小螢幕進一步減少邊距 */
    .container {
        padding: 0 1rem;
    }

    .section {
        padding: 3rem 1rem;
    }

    .nav-container {
        padding: 1rem;
    }

    .hero-content {
        padding: 0 1rem;
    }

    .cta-section {
        padding: 5rem 1rem;
    }

    .footer {
        padding: 2.5rem 1rem 1.5rem;
    }

    .section-header {
        margin-bottom: 3rem;
    }
}