/* Define color variables for light and dark themes */
:root {
    --bg-color: #f3f4f6; /* gray-100 */
    --text-color: #1f2937; /* gray-800 */
    --text-muted-color: #4b5563; /* gray-600 */
    --accent-color: #1993BC; /* blue-500 */
    --accent-text-color: #ffffff;
    --card-bg-color: rgba(255, 255, 255, 0.7);
    --card-bg-opaque: rgb(255, 255, 255);
    --card-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --border-color: rgba(0, 0, 0, 0.1);
}

.dark {
    --bg-color: #1f2937; /* gray-800 */
    --text-color: #f3f4f6; /* gray-100 */
    --text-muted-color: #d1d5db; /* gray-300 */
    --accent-color: #1993BC; /* blue-400 */
    --accent-text-color: #1f2937;
    --card-bg-color: rgba(55, 65, 81, 0.7); /* gray-700 with alpha */
    --card-bg-opaque: rgb(55, 65, 81);
    --card-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.2), 0 2px 4px -2px rgb(0 0 0 / 0.2);
    --border-color: rgba(255, 255, 255, 0.1);
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}
.page {
    transition: opacity 0.5s ease-in-out, transform 0.5s ease-in-out;
    position: relative;
    width: 100%;
}
.page-hidden {
    opacity: 0;
    transform: scale(0.95);
    pointer-events: none;
}
.page-visible {
    opacity: 1;
    transform: scale(1);
}
.page-scroll-container {
    height: 100vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
}

.nav-button {
    position: fixed;
    top: 0;
    bottom: 0;
    width: 5rem; /* Increased width for a larger hover/tap area */
    z-index: 30;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    transition: background-color 0.3s ease-in-out;
}
.nav-button:hover {
    background-color: rgba(0, 0, 0, 0.05);
}
.nav-button svg {
    transition: transform 0.2s ease-in-out;
    color: var(--text-muted-color);
}
.nav-button:hover svg {
    transform: scale(1.2);
}
.nav-button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    background-color: transparent !important; /* Ensure no hover effect when disabled */
}

/* New Themed Modal and Header Styles */
a.header-button, .header-button {
    background-color: var(--card-bg-opaque);
    color: var(--text-color);
    border-radius: 9999px;
    height: 3rem; /* h-12 */
    width: 3rem; /* w-12 */
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600; /* font-semibold */
    box-shadow: var(--card-shadow);
    transition: transform 0.2s, background-color 0.3s;
}
a.header-button:hover, .header-button:hover {
    transform: scale(1.05);
}

.modal-backdrop {
    position: fixed;
    inset: 0;
    z-index: 50;
    background-color: rgba(0, 0, 0, 0.25);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}
.modal-backdrop:not(.hidden) {
    opacity: 1;
    pointer-events: auto;
}
.modal-content {
    background-color: var(--card-bg-opaque);
    border-radius: 1rem; /* rounded-2xl */
    box-shadow: var(--card-shadow);
    width: 100%;
    max-width: 28rem; /* max-w-md */
    /* Make the modal content a flex container to manage its children's layout */
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 2rem); /* Ensure modal doesn't exceed viewport height */
    padding: 2rem; /* p-8 */
}
.modal-title {
    font-size: 1.5rem; /* text-2xl */
    line-height: 2rem;
    font-weight: 700; /* font-bold */
    color: var(--text-color);
}
.modal-icon-button {
    color: var(--text-muted-color);
}
.modal-icon-button:hover {
    color: var(--text-color);
}
.modal-body {
    overflow-y: auto; /* Allow this part to scroll */
    -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
    padding-right: 0.5rem; /* Space for scrollbar */
    margin-right: -0.5rem; /* Offset the padding to keep content aligned */
}

/* Themed Page Content Styles */
.page-card {
    background-color: var(--card-bg-color);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    padding: 1.5rem; /* p-6 */
    border-radius: 0.75rem; /* rounded-xl */
    box-shadow: var(--card-shadow);
}

/* Themed Overview/Menu Links */
.overview-link-button {
    width: 100%;
    text-align: left;
    font-size: 1.125rem; /* text-lg */
    line-height: 1.75rem;
    font-weight: 500; /* font-medium */
    padding: 0.75rem; /* p-3 */
    border-radius: 0.5rem; /* rounded-lg */
    transition: background-color 0.2s, color 0.2s;
    color: var(--text-muted-color);
}
.overview-link-button:hover {
    background-color: var(--accent-color);
    color: var(--accent-text-color);
}
.overview-link-button.active {
    background-color: var(--accent-color);
    color: var(--accent-text-color);
}

/* Themed Checklist Items */
.checklist-item {
    display: flex;
    align-items: center;
    color: var(--text-color);
}
.checklist-checkbox {
    height: 1.25rem; /* h-5 */
    width: 1.25rem; /* w-5 */
    border-radius: 0.25rem; /* rounded */
    border-color: var(--border-color);
    margin-right: 0.75rem; /* mr-3 */
    accent-color: var(--accent-color);
}
.checklist-checkbox:focus {
    --tw-ring-color: var(--accent-color);
}
.checklist-item input:checked + span {
    text-decoration: line-through;
    text-decoration-color: var(--accent-color);
    text-decoration-thickness: 2px;
    color: var(--accent-color);
    transition: color 0.2s, text-decoration-color 0.2s;
}