/*
 * Corporate Modern CSS with Light/Dark Mode
 * Version 5.1
 */

/* 1. Design Tokens and Variables
---------------------------------------------------------------------- */
:root {
    /* Font Families */
    --font-family-sans-serif: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-family-monospace: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

    /* Spacing & Sizing */
    --spacing-base: 1rem;
    --border-radius: 0.5rem;
    --container-max-width: 1140px;

    /* Transitions */
    --transition-speed: 0.2s;
}

/* Light Mode Colors (Default) */
:root {
    --bg-color: #ffffff;
    --text-color: #000000;
    --primary-color: #007BFF;
    --primary-color-hover: #0056b3;
    --border-color: #dee2e6;
    --card-bg-color: #f8f9fa;
    --card-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

/* Dark Mode Colors */
body.dark-mode {
    --bg-color: #000000;
    --text-color: #ffffff;
    --primary-color: #007BFF;
    --primary-color-hover: #3395ff;
    --border-color: #343a40;
    --card-bg-color: #1c1c1e;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* 2. General Body and Root Styles
---------------------------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    font-family: var(--font-family-sans-serif);
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: calc(var(--spacing-base) * 2);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-speed) ease-in-out, color var(--transition-speed) ease-in-out;
}

/* 3. Layout and Containers
---------------------------------------------------------------------- */
#header, #footer {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-base) calc(var(--spacing-base) * 2);
    margin-bottom: calc(var(--spacing-base) * 2);
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
}

#footer {
    text-align: center;
    font-size: 0.9rem;
}

.content {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0;
}

.card {
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: calc(var(--spacing-base) * 2);
    margin-bottom: calc(var(--spacing-base) * 2);
    box-shadow: var(--card-shadow);
    transition: box-shadow var(--transition-speed) ease-in-out, transform var(--transition-speed) ease-in-out;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
}

/* 4. Typography
---------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
    margin-top: 0;
    margin-bottom: calc(var(--spacing-base) * 0.5);
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-color);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }

p {
    margin-top: 0;
    margin-bottom: var(--spacing-base);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-speed) ease;
}

a:hover {
    color: var(--primary-color-hover);
    text-decoration: underline;
}

ul, ol {
    padding-left: calc(var(--spacing-base) * 1.5);
}

hr {
    margin-top: calc(var(--spacing-base) * 2);
    margin-bottom: calc(var(--spacing-base) * 2);
    border: 0;
    border-top: 1px solid var(--border-color);
}

/* 5. Buttons
---------------------------------------------------------------------- */
.button {
    display: inline-block;
    font-weight: 500;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 1px solid transparent;
    padding: 0.5rem 1.5rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: var(--border-radius);
    transition: all var(--transition-speed) ease-in-out;
    background-color: var(--primary-color);
    color: #fff;
}

.button:hover {
    background-color: var(--primary-color-hover);
    text-decoration: none;
    color: #fff;
    transform: translateY(-2px);
}

/* 6. Navigation
---------------------------------------------------------------------- */
.nav {
    display: flex;
    justify-content: center;
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav a {
    color: var(--text-color);
    text-decoration: none;
    padding: 0.5rem 1.5rem;
    transition: color 0.3s ease, background-color 0.3s ease;
    border-radius: 5px;
    display: block;
}

.nav a:hover {
    color: #fff;
    background-color: var(--primary-color);
    transform: translateY(-2px);
}

.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: var(--card-bg-color);
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
    list-style: none;
    padding: 0;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.dropdown-content a {
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
}

.dropdown:hover .dropdown-content {
    display: block;
}

/* 7. Theme Switcher
---------------------------------------------------------------------- */
.theme-switcher {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

/* 8. Footer Enhancements
---------------------------------------------------------------------- */
.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-left {
    flex: 1;
    text-align: left;
}

.footer-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.social-links a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 1.5rem; /* Larger icons */
    transition: color var(--transition-speed) ease;
}

.social-links a:hover {
    color: var(--primary-color);
    transform: translateY(-2px);
}

#footer {
    text-align: initial;
}

/* 9. Animations
---------------------------------------------------------------------- */
@keyframes fade-in {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

#header, .content, #footer {
    animation: fade-in 0.5s ease-in-out;
}

/* 10. Consent Modal
---------------------------------------------------------------------- */
.consent-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.consent-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.consent-modal {
    background-color: var(--card-bg-color);
    padding: calc(var(--spacing-base) * 2);
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    max-width: 500px;
    width: 90%;
    text-align: center;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.consent-overlay.visible .consent-modal {
    transform: scale(1);
}

.consent-modal h2 {
    margin-top: 0;
    margin-bottom: var(--spacing-base);
}

.consent-modal p {
    margin-bottom: calc(var(--spacing-base) * 1.5);
}

.consent-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-base);
}

.button-secondary {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.button-secondary:hover {
    background-color: var(--border-color);
    color: var(--text-color);
}