/* ============================================
   香港專科中心 (泌尿科) - Shared CSS
   Brand: #7f017f (purple) | Healthcare blue-teal
   Mobile breakpoint: 768px
   ============================================ */

:root {
    --primary: #7f017f;
    --primary-dark: #6b006b;
    --primary-light: #a33fa3;
    --secondary: #2c5f8d;
    --secondary-dark: #1e4566;
    --accent: #e8f4f8;
    --white: #ffffff;
    --off-white: #f8f9fa;
    --light-gray: #e9ecef;
    --medium-gray: #adb5bd;
    --dark-gray: #495057;
    --text: #212529;
    --text-light: #6c757d;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-base: 18px;
    --font-size-sm: 16px;
    --font-size-lg: 20px;
    --font-size-xl: 24px;
    --font-size-2xl: 28px;
    --line-height: 1.6;
    --max-width: 1200px;
    --container-padding: 1.5rem;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
}

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

html { font-size: var(--font-size-base); line-height: var(--line-height); scroll-behavior: smooth; }

body {
    font-family: var(--font-base);
    color: var(--text);
    background-color: var(--off-white);
    line-height: var(--line-height);
    -webkit-font-smoothing: antialiased;
}

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

a { color: var(--primary); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--primary-dark); }
a:hover:not(.btn):not(.nav-link):not(.btn-wa-sm):not(.btn-cn-sm) { text-decoration: underline; }

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

/* ==================== HEADER ==================== */
.site-header {
    background-color: var(--white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    gap: var(--spacing-md);
}

.logo {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary);
    text-decoration: none;
    line-height: 1.3;
    flex-shrink: 0;
}
.logo:hover { text-decoration: none; color: var(--primary-dark); }
.logo small { display: block; font-size: 0.75rem; font-weight: 400; }

.header-cta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}
.header-cta .btn {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.85rem;
    min-height: 36px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.btn-wa-sm { background-color: #25d366; color: #fff !important; border-radius: var(--border-radius); }
.btn-wa-sm:hover { background-color: #128c7e; color: #fff !important; text-decoration: none; }
.btn-cn-sm { background-color: var(--secondary); color: #fff !important; border-radius: var(--border-radius); }
.btn-cn-sm:hover { background-color: var(--secondary-dark); color: #fff !important; text-decoration: none; }

/* Header button visibility: desktop vs mobile */
.header-cta .h-desk { display: inline-flex; }
.header-cta .h-mob  { display: none; }
@media (max-width: 768px) {
    .header-cta .h-desk { display: none; }
    .header-cta .h-mob  { display: inline-flex; }
}

/* ==================== NAV ==================== */
.main-nav {
    background-color: var(--primary);
    padding: 0;
    width: 100%;
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: var(--max-width);
    margin: 0 auto;
    overflow-x: auto;
    scrollbar-width: none;
}
.nav-inner::-webkit-scrollbar { display: none; }

/* ==================== MOBILE MENU OVERLAY ==================== */
.menu-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255,255,255,0.98);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease;
}
.menu-overlay.active { opacity: 1; visibility: visible; }

.menu-overlay-inner {
    display: flex;
    flex-direction: column;
    gap: 0;
    width: 85%;
    max-width: 360px;
}

.menu-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    color: var(--primary);
    border: none;
    border-radius: 50%;
    width: 64px;
            height: 64px;
            font-size: 2.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.menu-item {
    display: flex;
    align-items: center;
    padding: 1rem 0;
    color: var(--text);
    text-decoration: none;
    font-size: 1.05rem;
    font-weight: 500;
    border-bottom: 1px solid rgba(0,0,0,0.08);
    transition: all 0.2s ease;
    opacity: 0;
    transform: translateY(10px);
}
.menu-overlay.active .menu-item {
    opacity: 1;
    transform: translateY(0);
}
.menu-overlay.active .menu-item:nth-child(2) { transition-delay: 0.05s; }
.menu-overlay.active .menu-item:nth-child(3) { transition-delay: 0.10s; }
.menu-overlay.active .menu-item:nth-child(4) { transition-delay: 0.15s; }
.menu-overlay.active .menu-item:nth-child(5) { transition-delay: 0.20s; }
.menu-overlay.active .menu-item:nth-child(6) { transition-delay: 0.25s; }
.menu-overlay.active .menu-item:nth-child(7) { transition-delay: 0.30s; }
.menu-overlay.active .menu-item:nth-child(8) { transition-delay: 0.35s; }
.menu-overlay.active .menu-item:nth-child(9) { transition-delay: 0.40s; }
.menu-overlay.active .menu-item:nth-child(10) { transition-delay: 0.45s; }

.menu-item:hover,
.menu-item.active {
    color: var(--primary);
    text-decoration: none;
    padding-left: 0.5rem;
    background: rgba(127,1,127,0.05);
    border-bottom-color: var(--primary-light);
}

.menu-overlay-footer {
    display: flex;
    gap: 1rem;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s ease 0.5s;
}
.menu-overlay.active .menu-overlay-footer {
    opacity: 1;
    transform: translateY(0);
}

.menu-overlay-footer a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: #fff;
    text-decoration: none;
    font-size: 0.95rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--primary);
    border-radius: 20px;
    background: var(--primary);
    transition: background 0.15s ease;
}
.menu-overlay-footer a:hover { background: var(--primary-dark); text-decoration: none; color: #fff; }

#menuToggle.h-mob { display: none; }
@media (max-width: 768px) {
    #menuToggle.h-mob { display: inline-flex !important; }
}

.nav-link {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--white);
    font-weight: 500;
    text-decoration: none;
    white-space: nowrap;
    border-bottom: 3px solid transparent;
    flex-shrink: 0;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s ease;
}
.nav-link:hover,
.nav-link.active {
    background-color: rgba(255,210,80,0.55);
    border-bottom-color: var(--white);
    text-decoration: none;
    color: var(--white);
}

/* ==================== HERO ==================== */
.hero {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    overflow: hidden;
    background-color: var(--light-gray);
}
.hero-slide {
    width: 100%;
    aspect-ratio: 4.26/1;
    display: none;
}
.hero-slide.active { display: block; }
.hero-slide img { width: 100%; height: auto; display: block; }

.hero-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.7));
    color: var(--white);
    padding: var(--spacing-2xl) var(--container-padding) var(--spacing-lg);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    line-height: 1.3;
}

/* ==================== MAIN CONTENT ==================== */
.main-content { padding: var(--spacing-2xl) 0; min-height: 60vh; }

.content-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--spacing-2xl);
}

.content-main {
    background-color: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
}

.content-sidebar { display: flex; flex-direction: column; gap: var(--spacing-lg); }

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 3px solid var(--primary-light);
}

.card {
    background-color: var(--white);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-lg);
}
.card-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text);
    margin-bottom: var(--spacing-sm);
}

/* Contact sidebar card */
.contact-card {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}
.contact-card h3 { font-size: var(--font-size-lg); margin-bottom: var(--spacing-md); color: var(--white); }

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-sm);
}
.contact-item a { color: var(--white); font-weight: 600; text-decoration: none; }
.contact-item a:hover { text-decoration: underline; color: var(--accent); }

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--border-radius);
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    text-align: center;
}
.btn-primary { background-color: var(--primary); color: var(--white); }
.btn-primary:hover { background-color: var(--primary-dark); color: var(--white); text-decoration: none; transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-secondary { background-color: var(--secondary); color: var(--white); }
.btn-secondary:hover { background-color: var(--secondary-dark); color: var(--white); text-decoration: none; transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-whatsapp { background-color: #25d366; color: var(--white); }
.btn-whatsapp:hover { background-color: #128c7e; color: var(--white); text-decoration: none; transform: translateY(-2px); box-shadow: var(--shadow-md); }

/* Breadcrumbs */
.breadcrumbs { padding: 0; margin: var(--spacing-xs) 0; font-size: 0.8rem; line-height: 1.2; }
.breadcrumb-item { display: inline-flex; align-items: center; gap: var(--spacing-xs); }
.breadcrumb-item:not(:last-child)::after { content: "/"; margin: 0 var(--spacing-sm); color: var(--medium-gray); }

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background-color: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    text-decoration: none;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    z-index: 999;
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { background-color: var(--primary-dark); text-decoration: none; }

/* Footer */
.site-footer {
    background-color: var(--dark-gray);
    color: var(--white);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}
.footer-inner {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}
.footer-section h4 { font-size: var(--font-size-base); margin-bottom: var(--spacing-md); color: var(--white); }
.footer-section ul { list-style: none; }
.footer-section ul li { margin-bottom: var(--spacing-sm); }
.footer-section a { color: var(--light-gray); text-decoration: none; font-size: var(--font-size-sm); }
.footer-section a:hover { color: var(--white); text-decoration: underline; }
.footer-bottom { border-top: 1px solid var(--medium-gray); padding-top: var(--spacing-lg); text-align: center; font-size: var(--font-size-sm); color: var(--light-gray); }

/* Health Links */
.health-links {
    background-color: var(--light-gray);
    padding: var(--spacing-md) 0;
    font-size: var(--font-size-sm);
}
.health-links-inner {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}
.health-links a { color: var(--text-light); text-decoration: none; }
.health-links a:hover { color: var(--primary); text-decoration: underline; }

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    .header-inner { gap: var(--spacing-sm); padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-sm) 0; }
    .logo { font-size: 0.85rem; }
    .header-inner a img { width: 40px; height: 40px; }
    .header-cta .btn { padding: var(--spacing-xs) var(--spacing-sm); font-size: 0.75rem; min-height: 32px; }
    .main-nav { padding: var(--spacing-sm) 0; position: relative; }
        .main-nav::after {
                    content: '';
                    position: absolute;
                    right: 0; top: 0; bottom: 0;
                    width: 40px;
                    background: linear-gradient(to right, transparent, var(--primary));
                    pointer-events: none;
                    z-index: 1;
                }
                .main-nav::before {
                    content: '';
                    position: absolute;
                    left: 0; top: 0; bottom: 0;
                    width: 24px;
                    background: linear-gradient(to left, transparent, var(--primary));
                    pointer-events: none;
                    z-index: 1;
                }
                .nav-inner {
                    display: flex;
                    flex-direction: row;
                    overflow-x: auto;
                    scrollbar-width: none;
                    gap: var(--spacing-sm);
                    padding: 0 var(--spacing-sm);
                    padding-left: 24px;
                    padding-right: 40px;
                }
        .nav-inner::-webkit-scrollbar { display: none; }
        .nav-link {
                            min-height: 44px;
                            padding: var(--spacing-sm) var(--spacing-xl);
                            font-size: 0.85rem;
                            border-radius: 20px;
                            text-align: center;
                            border: 1px solid rgba(255,255,255,0.3);
                            background: transparent;
                            flex-shrink: 0;
                            white-space: nowrap;
                            line-height: 1;
                        }
        .nav-link:hover {
            background: rgba(255,210,80,0.55);
            border-color: rgba(255,255,255,0.8);
            color: var(--white);
            transform: scale(1.08);
        }
                .nav-link.active { background: rgba(255,255,255,0.22); border-color: var(--white); font-weight: 600; }
    .content-layout { grid-template-columns: 1fr; }
    .content-sidebar { order: -1; }
}

@media (max-width: 576px) {
    html { font-size: 16px; }
    .container { padding: 0 var(--spacing-md); }
    .section-title { font-size: var(--font-size-xl); }
    .content-main { padding: var(--spacing-md); }
    .hero-caption { font-size: var(--font-size-lg); padding: var(--spacing-lg) var(--spacing-md); }
}