/* Common CSS for all pages */

:root {
    --bg-color: #F9FAFB;
    --text-color: #374151;
    --text-color-muted: #6B7280;
    --text-color-strong: #111827;
    --card-bg-color: rgba(255, 255, 255, 0.8);
    --border-color: #E5E7EB;
    --border-hover-color: #D1D5DB;
    --header-bg: rgba(255,255,255,0.5);
    --watermark-stroke: rgba(0, 0, 0, 0.15);
    --link-color: #2563EB;
    --glow-color: rgba(0, 0, 0, 0.07);
    --footer-text-color: #9CA3AF;
    --button-primary-bg: #111827;
    --button-primary-text: #FFFFFF;
    --button-primary-hover-bg: #374151;
    --mobile-menu-bg: rgba(255,255,255,0.9);
    --icon-stroke: #2563EB;
    --icon-hover-stroke: #111827;
    --error-color: #DC2626;
}

[data-theme="dark"] {
    --bg-color: #000000;
    --text-color: #E5E5E5;
    --text-color-muted: #999;
    --text-color-strong: #FFFFFF;
    --card-bg-color: rgba(17, 17, 17, 0.8);
    --border-color: #333;
    --border-hover-color: #555;
    --header-bg: rgba(0,0,0,0.5);
    --watermark-stroke: rgba(255, 255, 255, 0.18);
    --link-color: #60A5FA;
    --glow-color: rgba(255, 255, 255, 0.07);
    --footer-text-color: #6b7280;
    --button-primary-bg: #FFFFFF;
    --button-primary-text: #000000;
    --button-primary-hover-bg: #E5E5E5;
    --mobile-menu-bg: rgba(0,0,0,0.9);
    --icon-stroke: #60A5FA;
    --icon-hover-stroke: #FFFFFF;
    --error-color: #F87171;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.logo-glow {
    filter: drop-shadow(0 0 15px var(--logo-glow-color));
}

.hero-watermark {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 400px;
    height: 400px;
    stroke: var(--watermark-stroke);
    z-index: -1;
    transition: stroke 0.3s ease;
    animation: pulse-watermark 8s infinite ease-in-out;
    will-change: transform;
}

@keyframes pulse-watermark {
    0% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
    50% { transform: translate(-50%, -50%) scale(1.05); opacity: 1; }
    100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
}

.section-title {
    padding-top: 4rem;
    padding-bottom: 2rem;
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
    transition: border-color 0.3s ease;
}

/* --- Enhanced Value Prop Card Styles --- */
.value-prop-card {
    position: relative;
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 2rem;
    text-align: left;
    overflow: hidden;
    backdrop-filter: blur(10px);
    opacity: 1;
    transform: translateY(0);
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.value-prop-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at var(--mouse-x) var(--mouse-y), var(--glow-color), transparent 40%);
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: 0;
}

.value-prop-card:hover::before {
    opacity: 1;
}

.value-prop-card > * {
    position: relative;
    z-index: 1;
}

.value-prop-card svg {
    width: 32px;
    height: 32px;
    stroke: var(--text-color-muted);
    margin-bottom: 1rem;
    transition: transform 0.3s ease;
}

.value-prop-card:hover svg {
    transform: scale(1.1);
}

.value-prop-card h3 {
    color: var(--text-color-strong);
    font-weight: 600;
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.value-prop-card p {
    color: var(--text-color-muted);
}

.value-prop-details-toggle {
    display: block;
    margin-top: 0.75rem;
    color: var(--link-color);
    text-decoration: underline;
    cursor: pointer;
    font-size: 0.875rem;
    z-index: 1;
}

.value-prop-expanded-description {
    height: 0;
    overflow: hidden;
    transition: height 0.3s ease-out, padding 0.3s ease-out;
    margin-top: 0;
    font-size: 0.8rem;
    color: var(--text-color-muted);
    line-height: 1.5;
    text-align: left;
    padding-top: 0;
}

.value-prop-expanded-description.open {
    height: auto;
    padding-top: 1rem;
}

/* --- Scrolling Application Card Styles --- */
.application-card {
    position: relative;
    display: block;
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    text-align: left;
    flex-shrink: 0;
    width: 300px;
    margin: 0 0.75rem;
    opacity: 1;
    transform: translateY(0);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.application-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover-color);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.application-card h3 {
    color: var(--text-color-strong);
}

.application-card p {
    color: var(--text-color-muted);
    font-size: 0.875rem;
}

.card-preview {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    width: 280px;
    height: 150px;
    margin-bottom: 1rem;
    border-radius: 0.5rem;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
    z-index: 20;
}

.application-card:hover .card-preview {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.card-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.scroller {
    max-width: 100%;
    overflow: hidden;
    -webkit-mask: linear-gradient(90deg, transparent, white 20%, white 80%, transparent);
    mask: linear-gradient(90deg, transparent, white 20%, white 80%, transparent);
}

.scroller__inner {
    display: flex;
    width: max-content;
    animation: scroll 60s linear infinite;
}

@keyframes scroll {
    to {
        transform: translate(calc(-50% - 0.75rem));
    }
}

.prose-custom {
    color: var(--text-color-muted);
    line-height: 1.75;
}

.prose-custom h2 {
    color: var(--text-color-strong);
    font-weight: 700;
    font-size: 1.875rem;
    letter-spacing: -0.025em;
    margin-bottom: 1rem;
}

.prose-custom h3 {
    color: var(--text-color-strong);
    font-weight: 600;
    font-size: 1.25rem;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.prose-custom p, .prose-custom ul {
    margin-bottom: 1.25rem;
}

.prose-custom ul {
    list-style-position: inside;
    padding-left: 1rem;
}

.prose-custom li {
    margin-bottom: 0.75rem;
}

.prose-custom strong {
    color: var(--text-color);
    font-weight: 600;
}

.prose-custom a {
    color: var(--link-color);
    text-decoration: underline;
}

.prose-custom blockquote {
    border-left: 4px solid var(--border-color);
    padding-left: 1rem;
    margin-left: 0;
    font-style: italic;
    color: var(--text-color);
}

.icon-card {
    position: relative;
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 2rem;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease, background-color 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    overflow: hidden;
    backdrop-filter: blur(10px);
    min-height: 240px;
}

.icon-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at var(--mouse-x) var(--mouse-y), var(--glow-color), transparent 40%);
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: -1;
}

.icon-card:hover::before {
    opacity: 1;
}

.icon-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 30px rgba(0, 0, 0, 0.1);
    border-color: var(--border-hover-color);
}

.icon-card svg {
    width: 48px;
    height: 48px;
    stroke: var(--icon-stroke);
    transition: stroke 0.3s ease, transform 0.3s ease;
    margin-bottom: 1rem;
    z-index: 1;
}

.icon-card:hover svg {
    stroke: var(--icon-hover-stroke);
    transform: scale(1.1);
}

.icon-title {
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
    z-index: 1;
}

.icon-description {
    font-weight: 400;
    font-size: 0.875rem;
    color: var(--text-color-muted);
    line-height: 1.5;
    transition: color 0.3s ease;
    z-index: 1;
}

.icon-details-toggle {
    display: block;
    margin-top: 0.75rem;
    color: var(--link-color);
    text-decoration: underline;
    cursor: pointer;
    font-size: 0.875rem;
    z-index: 1;
}

.icon-expanded-description {
    display: none;
    margin-top: 1rem;
    font-size: 0.8rem;
    color: var(--text-color-muted);
    line-height: 1.5;
    text-align: left;
}

.module-card {
    position: relative;
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 2rem;
    overflow: hidden;
    backdrop-filter: blur(10px);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out, background-color 0.2s ease, border-color 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    min-height: 280px;
}

.module-card.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.module-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(circle at var(--mouse-x) var(--mouse-y), var(--glow-color), transparent 40%);
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: 0;
    border-radius: 0.75rem;
}

.module-card:hover::before {
    opacity: 1;
}

.module-card:hover {
    border-color: var(--border-hover-color);
    transform: translateY(-5px);
}

.module-card > * {
    position: relative;
    z-index: 1;
}

.module-card-icon {
    display: inline-flex;
    padding: 0.75rem;
    border-radius: 0.5rem;
    background-color: var(--link-color);
    margin-bottom: 1rem;
}

.module-card-icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--bg-color);
}

.module-card h3 {
    color: var(--text-color-strong);
    font-weight: 600;
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.module-card p {
    font-size: 0.9rem;
    line-height: 1.6;
    margin: 0;
    color: var(--text-color-muted);
    flex-grow: 1;
}

.module-details-toggle {
    display: block;
    margin-top: 0.75rem;
    color: var(--link-color);
    text-decoration: underline;
    cursor: pointer;
    font-size: 0.875rem;
    z-index: 1;
}

.module-expanded-description {
    display: none;
    margin-top: 1rem;
    font-size: 0.8rem;
    color: var(--text-color-muted);
    line-height: 1.5;
    text-align: left;
}

.principle-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border-radius: 0.5rem;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.principle-card.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.principle-card svg {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    stroke: var(--link-color);
}

.principle-card h3 {
    font-weight: 600;
    color: var(--text-color-strong);
    margin-bottom: 0.25rem;
}

.principle-card p {
    font-size: 0.9rem;
    line-height: 1.6;
    margin: 0;
}

.compliance-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
    text-align: center;
}

.compliance-card {
    position: relative;
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    backdrop-filter: blur(10px);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out, background-color 0.2s ease, border-color 0.2s ease;
    min-height: 240px;
    display: flex;
    flex-direction: column;
}

.compliance-card.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.compliance-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(circle at var(--mouse-x) var(--mouse-y), var(--glow-color), transparent 40%);
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: 0;
    border-radius: 0.5rem;
}

.compliance-card:hover::before {
    opacity: 1;
}

.compliance-card:hover {
    border-color: var(--border-hover-color);
}

.compliance-card a {
    color: var(--text-color-muted);
    text-decoration: none;
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.compliance-card a > div:first-child {
    flex-grow: 1;
}

[data-theme="light"] .compliance-card a {
    color: var(--text-color);
}

.theme-switch-wrapper {
    display: flex;
    align-items: center;
}

.theme-switch {
    display: inline-block;
    height: 24px;
    position: relative;
    width: 48px;
}

.theme-switch input {
    display:none;
}

.slider {
    background-color: #333;
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    background-color: #fff;
    bottom: 4px;
    content: "";
    height: 16px;
    left: 4px;
    position: absolute;
    transition: .4s;
    width: 16px;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: #ccc;
}

input:checked + .slider:before {
    transform: translateX(24px);
}

.nav-link {
    color: var(--text-color-muted);
    transition: color 0.2s ease;
}

.nav-link:hover {
    color: var(--text-color-strong);
}

.nav-link.active {
    color: var(--text-color-strong);
    font-weight: 600;
}

/* Mobile Menu Specific Styles */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--mobile-menu-bg);
    backdrop-filter: blur(10px);
    z-index: 50;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.mobile-menu.open {
    opacity: 1;
    visibility: visible;
}

.mobile-menu-link {
    color: var(--text-color-strong);
    font-size: 1.5rem;
    padding: 1rem 0;
    width: 100%;
    text-align: center;
    transition: color 0.2s ease;
}

.mobile-menu-link:hover {
    color: var(--link-color);
}

.close-button {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 60;
}

.close-button svg {
    stroke: var(--text-color-strong);
    width: 32px;
    height: 32px;
}

/* Table of Contents Specific Styles */
.toc-container {
    position: sticky;
    top: 10rem; /* Adjust based on header height */
    height: calc(100vh - 12rem); /* Adjust based on header/footer */
    overflow-y: auto;
    padding-left: 2rem;
    border-left: 1px solid var(--toc-border);
    flex-shrink: 0;
    width: 250px; /* Fixed width for TOC */
    display: none; /* Hidden by default on small screens */
}

@media (min-width: 1024px) { /* lg breakpoint */
    .toc-container {
        display: block; /* Show on large screens */
    }
}

.toc-container h3 {
    color: var(--text-color-strong);
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.toc-container ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-container li {
    margin-bottom: 0.5rem;
}

.toc-container a {
    display: block;
    color: var(--toc-link-color);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.toc-container a:hover {
    color: var(--toc-link-hover);
    background-color: rgba(0,0,0,0.1); /* Subtle hover effect */
}

[data-theme="light"] .toc-container a:hover {
     background-color: rgba(0,0,0,0.05);
}

.toc-container a.active {
    color: var(--toc-link-active);
    font-weight: 600;
    background-color: rgba(0,0,0,0.15); /* Active background */
}

[data-theme="light"] .toc-container a.active {
     background-color: rgba(0,0,0,0.08);
}

/* Back to Top Button */
#backToTopBtn {
    background-color: var(--link-color);
    color: var(--bg-color);
    opacity: 0;
    visibility: hidden;
}

#backToTopBtn.show {
    opacity: 1;
    visibility: visible;
}

/* Custom Scrollbar Styles */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-hover-color);
}

/* Scroll Animation for text elements */
.animated-text {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animated-text.is-visible {
    opacity: 1;
    transform: translateY(0);
}

footer a[href="privacy.html"] {
    color: var(--text-color-strong);
    font-weight: 600;
}

html {
    scroll-behavior: smooth;
}

/* Accessibility: Skip to main content link (hidden until focused) */
.skip-to-content {
    position: absolute;
    left: -9999px;
    z-index: 999;
    padding: 1rem;
    background-color: var(--button-primary-bg);
    color: var(--button-primary-text);
    text-decoration: none;
    border-radius: 0.25rem;
}

.skip-to-content:focus {
    left: 1rem;
    top: 1rem;
}

/* Button hover styles to replace inline event handlers */
.hover-button-primary:hover {
    background-color: var(--button-primary-hover-bg) !important;
}

.hover-button-secondary:hover {
    background-color: var(--card-bg-color) !important;
}

/* --- Contact Form Styles --- */
.form-input,
.form-textarea,
.form-select {
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    width: 100%;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--link-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

[data-theme="dark"] .form-input:focus,
[data-theme="dark"] .form-textarea:focus,
[data-theme="dark"] .form-select:focus {
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.1);
}

.submit-button {
    background-color: var(--button-primary-bg);
    color: var(--button-primary-text);
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    width: 100%;
    border: none;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

.submit-button:hover {
    background-color: var(--button-primary-hover-bg);
    transform: translateY(-1px);
}

.submit-button:active {
    transform: translateY(0);
}

.error-message {
    color: var(--error-color, #DC2626);
    font-size: 0.875rem;
    margin-top: 0.25rem;
    display: block;
}

.animated-text {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animated-text.is-visible {
    opacity: 1;
    transform: translateY(0);
}