:root {
    --main-bg-color: #f7f7f7;
    --text-color: #333;
    --accent-color: #007aff;
    --advice-bg-color: #eef7ee;
    --advice-border-color: #6aaa64;
    --progress-inactive: #d3d3d3;
    --progress-active: #6aaa64;
    --button-bg-color: #fff;
    --button-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
* {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}
html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--main-bg-color);
    color: var(--text-color);
    overscroll-behavior-y: contain;
    overflow: hidden;
}
.guide-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    width: 100%;
    position: fixed;
    top: 0;
    left: 0;
}
.progress-bar {
    display: flex;
    justify-content: center;
    padding: 15px 10px 10px;
    flex-shrink: 0;
    opacity: 0;
    transition: opacity 0.5s ease;
}
.progress-bar.visible {
    opacity: 1;
}
.progress-dot {
    height: 6px;
    flex-grow: 1;
    max-width: 40px;
    background-color: var(--progress-inactive);
    margin: 0 2px;
    border-radius: 3px;
    transition: background-color 0.3s ease;
}
.progress-dot.active {
    background-color: var(--progress-active);
}
.slide {
    flex-grow: 1;
    display: none;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    text-align: left;
    padding: 30px 20px 20px;
    overflow-y: auto;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.3s ease;
}
.slide.active {
    display: flex;
    position: relative;
    visibility: visible;
    opacity: 1;
}
.slide-content {
    max-width: 600px;
    width: 100%;
}
h1, h2 {
    font-weight: 600;
    text-align: center;
}
h1 { font-size: 28px; }
h2 { font-size: 24px; margin-bottom: 20px; }
h3 {
    font-size: 22px;
    margin-top: 0;
    margin-bottom: 20px;
    font-weight: 600;
    text-align: left;
}
h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-color);
    margin-top: 20px;
    margin-bottom: 8px;
    padding-bottom: 4px;
    border-bottom: 1px solid #ccc;
    text-align: left;
}
p, li { font-size: 16px; line-height: 1.7; }
ul, ol { padding-left: 20px; list-style-position: outside; }
li { margin-bottom: 8px; }
.advice {
    background-color: var(--advice-bg-color);
    border-left: 4px solid var(--advice-border-color);
    padding: 15px;
    margin-top: 20px;
    border-radius: 0 8px 8px 0;
}
.advice h4 {
    margin: 0 0 10px 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--advice-border-color);
    border: none;
}
.advice p, .advice ol { margin: 0; font-size: 15px; }
.intro-text {
    text-align: center;
    margin-top: 20px;
    color: #666;
    font-size: 15px;
}
.os-selection {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 30px;
}
.os-button, .action-button {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background-color: var(--button-bg-color);
    border: 1px solid #ddd;
    border-radius: 12px;
    box-shadow: var(--button-shadow);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    font-size: 18px;
    font-weight: 500;
    color: var(--text-color);
    text-align: left;
}
.os-button:hover, .action-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.12);
}
.os-icon {
    width: 32px;
    height: 32px;
    margin-right: 20px;
    object-fit: contain;
    flex-shrink: 0;
    filter: brightness(0.8); /* Slightly darken for consistency */
}
.checklist-form {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-top: 15px;
}
.checklist-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    padding: 15px 10px;
    border-radius: 12px;
    border: 1px solid #e0e0e0;
    text-align: center;
    position: relative;
    cursor: pointer;
}
.checklist-item input[type="checkbox"] {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 22px;
    height: 22px;
    accent-color: var(--accent-color);
}
.checklist-item label {
    font-size: 14px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}
.checklist-emoji {
    font-size: 28px;
}
.action-button {
    width: 100%;
    margin-top: 20px;
    background-color: var(--accent-color);
    color: white;
    font-weight: 600;
}
.back-to-hub-button {
    background-color: #6c757d !important;
    color: white !important;
    border: none !important;
    font-size: 16px !important;
    padding: 15px 20px !important;
    border-radius: 8px !important;
    cursor: pointer !important;
    transition: background-color 0.2s ease !important;
}
.back-to-hub-button:hover {
    background-color: #5a6268 !important;
    transform: translateY(-1px);
}
.source-link {
    margin-top: 25px;
    font-size: 14px;
    text-align: right;
}
.source-link a {
    color: var(--accent-color);
    text-decoration: none;
}
.hub-header {
    text-align: center;
    font-weight: bold;
    color: #555;
    margin-bottom: 40px;
}
.hub-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.hub-list-item button {
    width: 100%;
    justify-content: flex-start;
    padding: 15px 20px;
}
.hub-list-item button .os-icon {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    object-fit: contain;
    filter: brightness(0.8); /* Slightly darken for consistency */
}
.hub-list-item button {
    text-align: left;
    display: flex;
    align-items: flex-start;
    gap: 15px;
}

/* Better styling for guide titles and subtitles in hub */
.hub-list-item button > div {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    min-height: 45px;
    justify-content: center;
}

.hub-list-item button > div > div:first-child {
    font-weight: 600;
    font-size: 16px;
    line-height: 1.3;
    margin-bottom: 4px;
}

.hub-list-item button > div > div:last-child {
    font-size: 14px;
    color: #666;
    line-height: 1.4;
    font-weight: normal;
}

/* Spacing for hub buttons */
.hub-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.navigation-prompt {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    color: #888;
    font-size: 14px;
}
.navigation-prompt svg {
    width: 32px;
    height: 32px;
}
.scenario-box {
    background: #f5f9ff;
    padding: 20px;
    border-radius: 12px;
    margin: 20px 0;
    border-left: 4px solid #007aff;
}
.step-highlight {
    background: #fff3cd;
    padding: 15px;
    border-radius: 8px;
    margin: 15px 0;
    border-left: 4px solid #ffc107;
}
.warning {
    background: #fff2f2;
    padding: 15px;
    border-radius: 8px;
    margin: 15px 0;
    border-left: 4px solid #dc3545;
}