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

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

body {
    overflow-x: hidden;
}

/* ===== Animations ===== */
@keyframes float {
    0%, 100% { transform: translateY(0px) scale(1); }
    50% { transform: translateY(-20px) scale(1.05); }
}

@keyframes float-delay {
    0%, 100% { transform: translateY(0px) scale(1); }
    50% { transform: translateY(-15px) scale(1.03); }
}

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

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

.animate-float-delay {
    animation: float-delay 8s ease-in-out infinite;
}

.animate-slide-up {
    animation: slide-up 0.8s ease-out forwards;
}

.animate-slide-up-delay {
    animation: slide-up 0.8s ease-out 0.15s forwards;
    opacity: 0;
}

.animate-slide-up-delay-2 {
    animation: slide-up 0.8s ease-out 0.3s forwards;
    opacity: 0;
}

.animate-slide-up-delay-3 {
    animation: slide-up 0.8s ease-out 0.45s forwards;
    opacity: 0;
}

/* ===== Scroll Reveal (progressive enhancement) ===== */
@media (prefers-reduced-motion: no-preference) {
    .reveal-up {
        opacity: 0;
        transform: translateY(30px);
        transition: opacity 0.7s ease-out, transform 0.7s ease-out;
    }
    
    .reveal-up.revealed {
        opacity: 1;
        transform: translateY(0);
    }
    
    .reveal-left {
        opacity: 0;
        transform: translateX(-40px);
        transition: opacity 0.7s ease-out, transform 0.7s ease-out;
    }
    
    .reveal-left.revealed {
        opacity: 1;
        transform: translateX(0);
    }
    
    .reveal-right {
        opacity: 0;
        transform: translateX(40px);
        transition: opacity 0.7s ease-out, transform 0.7s ease-out;
    }
    
    .reveal-right.revealed {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ===== Fallback: ensure content is visible without JS ===== */
@supports not (animation-name: slide-up) {
    .reveal-up,
    .reveal-left,
    .reveal-right {
        opacity: 1;
        transform: none;
    }
}

/* ===== Navbar ===== */
.nav-logo-text {
    transition: color 0.3s ease;
}

.nav-link {
    transition: all 0.3s ease;
}

/* Navbar scrolled state */
.nav-scrolled {
    background: rgba(255, 255, 255, 0.95) !important;
    backdrop-filter: blur(20px);
    box-shadow: 0 1px 20px rgba(10, 22, 40, 0.08);
}

.nav-scrolled .nav-logo-text {
    color: #0a1628;
}

.nav-scrolled .nav-link {
    color: #113070;
}

/* ===== Mobile Menu ===== */
#mobile-menu {
    animation: slide-down 0.3s ease-out;
}

@keyframes slide-down {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.mobile-link {
    transition: all 0.3s ease;
}

/* ===== Buttons ===== */
button, a {
    cursor: pointer;
}

/* ===== Form Inputs ===== */
input:focus,
textarea:focus {
    outline: none;
}

/* ===== Selection ===== */
::selection {
    background: #4ade80;
    color: #0a1628;
}

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

::-webkit-scrollbar-track {
    background: #e8eef7;
}

::-webkit-scrollbar-thumb {
    background: #9fb5db;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #7897cb;
}

/* ===== Responsive tweaks ===== */
@media (max-width: 640px) {
    .font-serif {
        line-height: 1.1;
    }
}