/* ========== 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(13, 148, 136, 0.15);
    color: #0f766e;
}

/* ========== SCROLLBAR ========== */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: #f8fafc;
}
::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* ========== HEADER ========== */
#site-header {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid transparent;
    transition: border-color 0.4s ease, box-shadow 0.4s ease;
}

#site-header.scrolled {
    border-bottom-color: rgba(0, 0, 0, 0.06);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04);
}

/* ========== MOBILE MENU ========== */
#mobile-menu.open {
    opacity: 1;
    pointer-events: all;
}

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

.mobile-link {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.3s ease, transform 0.3s ease, color 0.3s ease;
}

#mobile-menu.closed .mobile-link {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.3s ease 0.15s, transform 0.3s ease 0.15s, color 0.3s ease;
}

/* ========== HAMBURGER ========== */
.menu-line {
    display: block;
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.25s ease;
}

#menu-toggle.active .menu-line:nth-child(1) {
    transform: translateY(4px) rotate(45deg);
}
#menu-toggle.active .menu-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
#menu-toggle.active .menu-line:nth-child(3) {
    transform: translateY(-4px) rotate(-45deg);
    width: 5px;
}

/* ========== SCROLL INDICATOR ========== */
.scroll-line {
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(0.6); transform-origin: top; }
    50% { opacity: 0.8; transform: scaleY(1); transform-origin: top; }
}

/* ========== REVEAL ANIMATIONS ========== */
.reveal {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger children */
.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; }

/* ========== REDUCED MOTION ========== */
@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
    html { scroll-behavior: auto; }
    .scroll-line { animation: none; opacity: 0.5; }
    img:hover { transform: none; }
}

/* ========== FORM ========== */
select option {
    color: #1e293b;
    background: #fff;
}

input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(0.4) sepia(1) saturate(3) hue-rotate(130deg);
    cursor: pointer;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 767px) {
    .font-serif {
        line-height: 1.15;
    }
}