/* ====================<< Mode >>==================== */
/* ========== CSS Reset Start (Meyer + Custom) ========== */

/* --- Reset default styles for common HTML elements --- */
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
	margin: 0;
	padding: 0;
	border: 0;
	font-size: 100%;
	font: inherit;
	vertical-align: baseline;
}

/* --- Ensure HTML5 elements are block-level --- */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
	display: block;
}

/* --- Set base line-height for body --- */
body {
	line-height: 1;
}

/* --- Remove default list styling --- */
ol, ul {
	list-style: none;
}

/* --- Remove default quote styling --- */
blockquote, q {
	quotes: none;
}
blockquote::before, blockquote::after,
q::before, q::after {
	content: '';
	content: none;
}

/* --- Reset table spacing --- */
table {
	border-collapse: collapse;
	border-spacing: 0;
}

/* ========== CSS Reset End ========== */


/* ========== Basic Utility Styles ========== */

/* --- Set font-family for body --- */
body {
	font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans TC', 'Microsoft JhengHei', sans-serif;
}

/* --- Remove underline and default link color --- */
a {
	text-decoration: none;
	color: inherit;
}

/* --- Responsive image scaling --- */
img {
	max-width: 100%;
	height: auto;
	display: block;
}

/* --- Remove form element default styles --- */
input, button, textarea, select {
	font: inherit;
	color: inherit;
	border: none;
	outline: none;
	background: none;
}

/* --- Show pointer cursor on buttons --- */
button {
	cursor: pointer;
}

/* --- Use border-box for all elements to include padding/border in size --- */
*, *::before, *::after {
	box-sizing: border-box;
}

/* ========== Debug Tools (for development only) ========== */

/* --- Add 1px outline to all elements for layout debugging --- */
/* * {
	outline: 1px solid black;
} */

/* ====================<< Mode >>==================== */

:root{
    --animation-primary: blink 1.5s infinite;
    --color-primary: #555;
    --color-secondary: #333;
}
@keyframes blink {
    0%,
    100% {
        opacity: 1;
    }
    50% {
        opacity: 0.3;
    }
}

html,
body {
    height: 100%;
    scroll-snap-type: y mandatory;
    overflow: auto;
    scroll-behavior: smooth;
}

.container {
    height: 100%;
}

.panel-manager {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    scroll-snap-align: start;
}

h2 {
    font-size: 3rem;
    color: var(--color-secondary);
    margin-bottom: 1rem;
}

.scroll-container {
    display: flex;
    flex-direction: row;
    width: calc(100vw * 4);
    height: 100vh;
    overflow-x: scroll;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
}
.scroll-container .panel {
    flex: 0 0 100vw;
    height: 100vh;
    scroll-snap-align: start;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    box-sizing: border-box;
    padding: 2rem;
    
}
.scroll-container .panel .gallery-image {
    max-width: 80%;
    max-height: 70%;
    object-fit: contain;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}
.scroll-container .panel .image-caption {
    margin-top: 1rem;
    font-size: 1.5rem;
    color: var(--color-secondary);
}


.gallery {
    position: relative;
}
.up {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    font-size: 1.5rem;
    margin-top: 2rem;
    text-align: center;
    animation: var(--animation-primary);
    color: var(--color-primary);
}
.up span {
    display: block;
    padding: 1rem;
}
.down {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    font-size: 1.5rem;
    margin-bottom: 2rem;
    text-align: center;
    animation: var(--animation-primary);
    color: var(--color-primary);
}
.down span {
    display: block;
    padding: 1rem;
}

.right {
    position: absolute;
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    font-size: 1.5rem;
    margin-right: 2rem;
    animation: var(--animation-primary);
    color: var(--color-primary);
}
.right span {
    padding: 0.5rem;
}

.scroll-btn-left {
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    font-size: 3rem;
    margin-left: 2rem;
    animation: var(--animation-primary);
    color: var(--color-primary);
}
.scroll-btn-right {
    position: absolute;
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    font-size: 3rem;
    margin-right: 2rem;
    animation: var(--animation-primary);
    color: var(--color-primary);
}

.up:hover, .down:hover, .right:hover, .scroll-btn-left:hover, .scroll-btn-right:hover {
    color: var(--color-secondary);
    animation: none;
}

@media (max-width: 800px) {
    .right span{
        display: none;
    }
}

@media (max-width: 600px) {
    .scroll-btn-left,
    .scroll-btn-right{
        font-size: 2rem;
    }
}