/* ============================================
   Hoonjae Yim, M.D. — Premium Dark Luxury
   Medical Practice Website
   ============================================ */

/* Custom CSS properties */
:root {
    --gold: #c9a84c;
    --gold-light: #d4b96a;
    --terracotta: #c65d3e;
    --sand: #e8d5b7;
    --sand-dark: #c4a87c;
    --dark: #0a0a0a;
    --deeper: #111111;
    --card: #1a1a1a;
    --border: #2a2a2a;
}

/* Base reset & typography */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    overflow-x: hidden;
}

/* Selection color */
::selection {
    background: rgba(201, 168, 76, 0.25);
    color: #e8d5b7;
}

/* ============================================
   Animations
   ============================================ */
@keyframes fade-up {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-up {
    animation: fade-up 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Scroll-triggered animations */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }
.reveal-delay-6 { transition-delay: 0.6s; }

/* ============================================
   Navbar
   ============================================ */
#navbar {
    background: transparent;
    transition: background 0.4s ease, backdrop-filter 0.4s ease, box-shadow 0.4s ease;
}

#navbar.scrolled {
    background: rgba(10, 10, 10, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 rgba(201, 168, 76, 0.08);
}

/* ============================================
   Mobile Menu
   ============================================ */
#mobileMenu.open {
    opacity: 1;
    pointer-events: all;
}

#mobileMenu.closed {
    opacity: 0;
    pointer-events: none;
}

.mobile-link {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.4s ease, transform 0.4s ease, color 0.3s ease;
}

#mobileMenu.open .mobile-link {
    opacity: 1;
    transform: translateY(0);
}

#mobileMenu.open .mobile-link:nth-child(1) { transition-delay: 0.1s; }
#mobileMenu.open .mobile-link:nth-child(2) { transition-delay: 0.15s; }
#mobileMenu.open .mobile-link:nth-child(3) { transition-delay: 0.2s; }
#mobileMenu.open .mobile-link:nth-child(4) { transition-delay: 0.25s; }
#mobileMenu.open .mobile-link:nth-child(5) { transition-delay: 0.3s; }

/* Menu button animation */
.menu-line {
    transition: transform 0.3s ease, opacity 0.3s ease;
}

#menuBtn.active .menu-line:nth-child(1) {
    transform: rotate(45deg) translate(3px, 3px);
}

#menuBtn.active .menu-line:nth-child(2) {
    opacity: 0;
}

#menuBtn.active .menu-line:nth-child(3) {
    transform: rotate(-45deg) translate(3px, -3px);
    width: 20px;
    margin-left: 0;
    margin-right: 0;
}

/* ============================================
   Service Cards
   ============================================ */
.service-card {
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.4s ease, box-shadow 0.4s ease;
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(201, 168, 76, 0.1);
}

/* ============================================
   Buttons
   ============================================ */
a {
    text-decoration: none;
}

/* ============================================
   Scrollbar
   ============================================ */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: #0a0a0a;
}

::-webkit-scrollbar-thumb {
    background: #2a2a2a;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #c9a84c;
}

/* ============================================
   Responsive adjustments
   ============================================ */
@media (max-width: 768px) {
    .font-display {
        line-height: 1.15;
    }
}

/* ============================================
   Focus styles for accessibility
   ============================================ */
a:focus-visible,
button:focus-visible {
    outline: 2px solid #c9a84c;
    outline-offset: 2px;
    border-radius: 4px;
}

/* ============================================
   Subtle shimmer on gold elements
   ============================================ */
@keyframes shimmer {
    0% { background-position: -200% center; }
    100% { background-position: 200% center; }
}

.gold-shimmer {
    background: linear-gradient(
        90deg,
        #c9a84c 0%,
        #e8d5b7 25%,
        #c9a84c 50%,
        #e8d5b7 75%,
        #c9a84c 100%
    );
    background-size: 200% auto;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: shimmer 4s linear infinite;
}