/* ============================================
   Dr. Subash Chander — Medical Website Styles
   ============================================ */

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

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

body {
    margin: 0;
    overflow-x: hidden;
}

::selection {
    background: rgba(16, 185, 129, 0.2);
    color: #064e3b;
}

/* ---- Hero Gradient ---- */
.hero-gradient {
    background: linear-gradient(135deg, #022c22 0%, #064e3b 25%, #047857 50%, #059669 75%, #10b981 100%);
    background-size: 400% 400%;
    animation: gradientShift 16s ease infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* ---- Hero Orbs ---- */
.hero-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: orbFloat 8s ease-in-out infinite;
}

.hero-orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, #34d399, transparent 70%);
    top: -200px;
    right: -100px;
    animation-delay: 0s;
}

.hero-orb-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, #6ee7b7, transparent 70%);
    bottom: -100px;
    left: -50px;
    animation-delay: -3s;
}

.hero-orb-3 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, #a7f3d0, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -5s;
}

@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -20px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

/* ---- Hero Content Animation ---- */
.hero-content {
    opacity: 1;
    animation: heroFadeIn 1s ease-out forwards;
}

@keyframes heroFadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ---- Scroll Reveal ---- */
.reveal-section {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal-section[data-revealed="false"] {
    opacity: 0;
    transform: translateY(30px);
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: white;
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 60%;
}

/* ---- Mobile Menu ---- */
.mobile-nav-link {
    display: block;
}

/* ---- Button Focus States ---- */
button:focus-visible,
a:focus-visible {
    outline: 2px solid #34d399;
    outline-offset: 2px;
    border-radius: 4px;
}

/* ---- Form Styles ---- */
input:focus,
textarea:focus {
    outline: none;
}

/* ---- Smooth transitions for all interactive elements ---- */
a, button {
    transition: all 0.2s ease;
}

/* ---- Print Styles ---- */
@media print {
    .hero-gradient, .hero-orb {
        display: none;
    }
    
    nav, #back-to-top {
        display: none;
    }
}

/* ---- Reduced Motion ---- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
    
    .reveal-section[data-revealed="false"] {
        opacity: 1;
        transform: none;
    }
}

/* ---- Responsive Tweaks ---- */
@media (max-width: 640px) {
    .hero-orb-1 {
        width: 300px;
        height: 300px;
    }
    
    .hero-orb-2 {
        width: 200px;
        height: 200px;
    }
    
    .hero-orb-3 {
        width: 150px;
        height: 150px;
    }
}