/* ============================================================
   SCROLL TRANSITIONS  — transitions.css
   ============================================================ */

/* Smooth scroll for the whole site */
html {
    scroll-behavior: smooth;
}

/* --- Scroll progress bar --- */
#scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0%;
    background: linear-gradient(90deg, #ffd600, #4caf50);
    z-index: 9999;
    transition: width 0.1s linear;
    pointer-events: none;
}

/* ============================================================
   REVEAL — fade + slide up (default)
   ============================================================ */
.reveal {
    transition: opacity 0.7s ease, transform 0.7s ease;
}

html.js-loaded .reveal {
    opacity: 0;
    transform: translateY(36px);
}

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

/* ============================================================
   REVEAL-LEFT — slide in from the left
   ============================================================ */
.reveal-left {
    transition: opacity 0.7s ease, transform 0.7s ease;
}

html.js-loaded .reveal-left {
    opacity: 0;
    transform: translateX(-48px);
}

.reveal-left.visible {
    opacity: 1;
    transform: translateX(0);
}

/* ============================================================
   REVEAL-RIGHT — slide in from the right
   ============================================================ */
.reveal-right {
    transition: opacity 0.7s ease, transform 0.7s ease;
}

html.js-loaded .reveal-right {
    opacity: 0;
    transform: translateX(48px);
}

.reveal-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* ============================================================
   REVEAL-SCALE — scale up from slightly smaller
   ============================================================ */
.reveal-scale {
    transition: opacity 0.7s ease, transform 0.7s ease;
}

html.js-loaded .reveal-scale {
    opacity: 0;
    transform: scale(0.92);
}

.reveal-scale.visible {
    opacity: 1;
    transform: scale(1);
}

/* ============================================================
   REVEAL-STAGGER — children stagger in one by one
   ============================================================ */
.reveal-stagger > * {
    transition: opacity 0.55s ease, transform 0.55s ease;
}

html.js-loaded .reveal-stagger > * {
    opacity: 0;
    transform: translateY(28px);
}

.reveal-stagger.visible > *:nth-child(1)  { transition-delay: 0.05s; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(2)  { transition-delay: 0.15s; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(3)  { transition-delay: 0.25s; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(4)  { transition-delay: 0.35s; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(5)  { transition-delay: 0.45s; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(6)  { transition-delay: 0.55s; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(7)  { transition-delay: 0.65s; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(8)  { transition-delay: 0.75s; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(n+9) { transition-delay: 0.80s; opacity: 1; transform: translateY(0); }

/* ============================================================
   SECTION WAVE DIVIDERS
   ============================================================ */
.section-wave {
    display: block;
    width: 100%;
    overflow: hidden;
    line-height: 0;
    margin: 0;
    padding: 0;
}

.section-wave svg {
    display: block;
    width: 100%;
    height: 60px;
}

/* ============================================================
   REDUCED MOTION — always show content, never animate
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }

    .reveal,
    .reveal-left,
    .reveal-right,
    .reveal-scale,
    .reveal-stagger > * {
        opacity: 1 !important;
        transform: none !important;
        transition: none !important;
    }

    #scroll-progress { display: none; }
}

/* ============================================================
   BACK TO TOP BUTTON
   ============================================================ */
#back-to-top {
    position: fixed;
    bottom: 36px;
    right: 32px;
    z-index: 999;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background: #063366;
    color: #ffd600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px rgba(6, 51, 102, 0.35);
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.3s ease, transform 0.3s ease, background 0.2s, box-shadow 0.2s;
    pointer-events: none;
}

#back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

#back-to-top:hover {
    background: #ffd600;
    color: #063366;
    box-shadow: 0 6px 24px rgba(255, 214, 0, 0.45);
    transform: translateY(-3px);
}

#back-to-top:active {
    transform: translateY(0);
}

@media (max-width: 600px) {
    #back-to-top {
        bottom: 20px;
        right: 16px;
        width: 42px;
        height: 42px;
    }
}

@media (prefers-reduced-motion: reduce) {
    #back-to-top { transition: opacity 0.3s ease; transform: none !important; }
}