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

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #F8F6FF; }
::-webkit-scrollbar-thumb { background: #DaddE8; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #C5A55A; }

::selection { background: rgba(197, 165, 90, 0.2); color: #1A1A2E; }

/* ===== Animation stagger ===== */
.stagger-1 { animation-delay: 0.1s; opacity: 0; }
.stagger-2 { animation-delay: 0.2s; opacity: 0; }
.stagger-3 { animation-delay: 0.4s; opacity: 0; }
.stagger-4 { animation-delay: 0.6s; opacity: 0; }

/* ===== Card hover border effect ===== */
.card-hover-border {
    position: relative;
    z-index: 1;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}
.card-hover-border::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 2px;
    background: linear-gradient(135deg, transparent 50%, #C5A55A 100%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: -1;
    pointer-events: none;
}
.card-hover-border:hover {
    transform: translateY(-4px);
    box-shadow: 0 15px 30px -10px rgba(26, 26, 46, 0.1);
}
.card-hover-border:hover::before { opacity: 0.7; }

/* ===== Nav scroll state ===== */
.nav-scrolled {
    box-shadow: 0 2px 20px rgba(26, 26, 46, 0.08);
    border-bottom-color: transparent;
}

/* ===== Fade-in observer ===== */
.fade-in-section {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}
.fade-in-section.visible {
    opacity: 1;
    transform: translateY(0);
}