/* ===== Custom Styles for Dr. Raghunandan Sundaram Website ===== */

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

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

body {
    overflow-x: hidden;
}

/* ===== Hero Animations ===== */
.hero-tagline {
    animation: slideUp 0.8s ease-out forwards;
}

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

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

@media (prefers-reduced-motion: no-preference) {
    .section-reveal {
        opacity: 0;
        transform: translateY(30px);
    }
    
    .section-reveal.revealed {
        opacity: 1;
        transform: translateY(0);
    }
    
    .service-card {
        opacity: 0;
        transform: translateY(20px);
        transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    }
    
    .service-card.revealed {
        opacity: 1;
        transform: translateY(0);
    }
    
    .approach-step {
        opacity: 0;
        transform: translateY(20px);
        transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    }
    
    .approach-step.revealed {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Navbar ===== */
#navbar {
    background: transparent;
}

#navbar.scrolled {
    background: rgba(254, 253, 248, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 rgba(6, 78, 59, 0.08);
}

/* ===== Mobile Menu ===== */
.mobile-link {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.3s ease, transform 0.3s ease, color 0.3s ease;
}

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

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

/* ===== Mobile Menu Button ===== */
.menu-line {
    transition: all 0.3s ease;
}

#mobile-menu-btn.active .menu-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

#mobile-menu-btn.active .menu-line:nth-child(3) {
    width: 24px;
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Service Cards ===== */
.service-card {
    transition: all 0.5s ease;
}

/* ===== Form Styles ===== */
input:focus,
select:focus,
textarea:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.15);
}

/* ===== Custom Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #fdf9ee;
}

::-webkit-scrollbar-thumb {
    background: #064e3b;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #047857;
}

/* ===== Selection ===== */
::selection {
    background: #064e3b;
    color: #fefdf8;
}

/* ===== Print Styles ===== */
@media print {
    #navbar, #mobile-menu-btn, .section-reveal {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
}

/* ===== Responsive Adjustments ===== */
@media (max-width: 768px) {
    .font-serif {
        line-height: 1.1;
    }
}

/* ===== Focus Visible for Accessibility ===== */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid #059669;
    outline-offset: 2px;
    border-radius: 4px;
}

/* ===== Loading State for Form ===== */
button[type="submit"]:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

button[type="submit"]:disabled::after {
    content: '';
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    margin-left: 8px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}