/* LPG Cardiology — Custom Styles */

/* Base & Typography */
html {
    scroll-behavior: smooth;
}

body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #060a14;
}
::-webkit-scrollbar-thumb {
    background: #1e293b;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #334155;
}

/* Selection */
::selection {
    background: rgba(20, 184, 166, 0.3);
    color: #f1f5f9;
}

/* Navbar transition */
#navbar.scrolled {
    background: rgba(6, 10, 20, 0.92);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(30, 41, 59, 0.5);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

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

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

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

#mobileMenu.open .mobile-link:nth-child(1) { transition-delay: 0.05s; }
#mobileMenu.open .mobile-link:nth-child(2) { transition-delay: 0.1s; }
#mobileMenu.open .mobile-link:nth-child(3) { transition-delay: 0.15s; }
#mobileMenu.open .mobile-link:nth-child(4) { transition-delay: 0.2s; }
#mobileMenu.open .mobile-link:nth-child(5) { transition-delay: 0.25s; }

/* Hamburger animation */
.menu-line {
    transform-origin: center;
}

#menuBtn.active .menu-line:nth-child(1) {
    transform: translateY(4px) rotate(45deg);
}

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

#menuBtn.active .menu-line:nth-child(3) {
    transform: translateY(-4px) rotate(-45deg);
    width: 1.25rem;
}

/* Service card hover glow */
.service-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 16px;
    padding: 1px;
    background: linear-gradient(135deg, transparent 40%, rgba(20, 184, 166, 0.1) 100%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.service-card:hover::before {
    opacity: 1;
}

/* Gold gradient text shimmer */
@keyframes shimmer {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.text-shimmer {
    background-size: 200% auto;
    animation: shimmer 4s linear infinite;
}

/* Pulse ring for hero accent */
@keyframes pulse-ring {
    0% { transform: scale(0.95); opacity: 0.6; }
    50% { transform: scale(1); opacity: 0.3; }
    100% { transform: scale(0.95); opacity: 0.6; }
}

.pulse-ring {
    animation: pulse-ring 2.5s ease-in-out infinite;
}

/* Subtle float animation for hero cards */
@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
}

.float-slow {
    animation: float 6s ease-in-out infinite;
}

.float-medium {
    animation: float 4.5s ease-in-out infinite;
}

/* Scroll-reveal base: content is VISIBLE by default */
.reveal {
    opacity: 1;
    transform: none;
    transition: opacity 0.7s ease, transform 0.7s ease;
}

/* Only apply hidden state when JS is active (progressive enhancement) */
.js .reveal {
    opacity: 0;
    transform: translateY(30px);
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: no-preference) {
    .js .reveal {
        opacity: 0;
        transform: translateY(30px);
    }
    .js .reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Button focus styles */
button:focus-visible,
a:focus-visible {
    outline: 2px solid #14b8a6;
    outline-offset: 2px;
    border-radius: 4px;
}

/* Input focus */
input:focus,
textarea:focus {
    box-shadow: 0 0 0 1px rgba(20, 184, 166, 0.3);
}

/* Image loading */
img {
    loading: lazy;
}