/* ========================================
   Three Rivers Nephrology — Custom Styles
   ======================================== */

/* Base reset and smooth scrolling */
*, *::before, *::after {
    box-sizing: border-box;
}

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

body {
    overflow-x: hidden;
}

/* Custom selection color */
::selection {
    background-color: rgba(61, 168, 139, 0.2);
    color: #0A1628;
}

/* ========================================
   Navigation
   ======================================== */

/* Initial state: transparent over hero */
#navbar {
    color: white;
}

#navbar.scrolled {
    background: rgba(4, 11, 20, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(61, 168, 139, 0.1);
}

#navbar.scrolled .nav-logo-text,
#navbar.scrolled .nav-logo-subtext {
    color: white;
}

#navbar.scrolled .nav-logo-drop {
    stroke: #5EBFA3;
}

/* Desktop nav links */
.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: #3DA88B;
    transition: width 0.3s ease;
}

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

/* ========================================
   Mobile Menu
   ======================================== */

.mobile-link {
    position: relative;
}

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

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

/* Hamburger animation */
#menu-icon span {
    transition: all 0.3s ease;
}

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

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

#menu-icon.active span:nth-child(3) {
    transform: rotate(-45deg) translate(3px, -3px);
    width: 1.5rem;
}

/* ========================================
   Hero Section
   ======================================== */

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

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

/* Scroll indicator pulse */
@keyframes pulse-line {
    0%, 100% { opacity: 0.3; height: 3rem; }
    50% { opacity: 0.8; height: 4rem; }
}

/* ========================================
   Service Cards
   ======================================== */

.service-card {
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(61, 168, 139, 0.5), transparent);
    transform: scaleX(0);
    transition: transform 0.5s ease;
}

.service-card:hover::before {
    transform: scaleX(1);
}

/* ========================================
   Scroll Reveal Animations
   (Progressive enhancement — content visible without JS)
   ======================================== */

@media (prefers-reduced-motion: no-preference) {
    .reveal {
        opacity: 1;
        transform: translateY(0);
        transition: opacity 0.8s ease, transform 0.8s ease;
    }
    
    .reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }
    
    /* Stagger delays for grid items */
    .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; }
}

/* Fallback: ensure content is visible even if JS fails */
.reveal {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   Form Styles
   ======================================== */

input:focus,
textarea:focus {
    outline: none;
}

input::placeholder,
textarea::placeholder {
    color: rgba(255, 255, 255, 0.2);
}

/* ========================================
   Responsive Adjustments
   ======================================== */

@media (max-width: 768px) {
    .floating-label {
        position: relative;
        left: 0 !important;
        top: 0 !important;
        margin-top: 1.5rem;
    }
}

@media (max-width: 640px) {
    .service-card {
        padding: 2rem !important;
    }
}