/* ===================================
   RESPONSIVE CSS WITH 5 BREAKPOINTS
   Mobile-First Design Approach
   =================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Saira:ital,wght@0,100..900;1,100..900&display=swap');

/* ===================================
   ROOT VARIABLES
   =================================== */
:root {
    /* Color Palette */
    --dark-bg: #020617;
    --main-bg: #090f20;
    --card-bg: #212536;
    --text-color: #d2d4e0;
    --purple-glow: #3e3a5a;
    --green-glow: #00ff73;
    --border-color: #3b3f54;
    --dark-green: #009900;
    --color-green: #00ff00;
    --light-text: #E1E9C9;
    --light-green: #00ff73;
    --color-navy: #1347b7;
    --accent-blue: #007bff;
    --accent-cyan: #00D9FF;
    --accent-magenta: #FF0080;
    --tag-orange: #e34f26;
    --bg-secondary: #16161D;
    --terminal-bg: #0c0c0c;
    --terminal-border: #333;
    --terminal-text: #00ff00;
    --terminal-prompt: #00ccff;
    --terminal-comment: #888;
    --terminal-output: #fff;
    --terminal-header: #2d2d2d;
    --legend-border: #444;

    /* Base Typography (Mobile First) */
    --font-p: 14px;
    --font-h1: 1.5rem;
    --font-h2: 1.2rem;
    --font-h3: 1.08rem;
    --font-h4: 1.02rem;
    --font-li: 14px;
    --font-a: 14px;
    --font-i: 13.5px;
    --font-table: 14px;
}

/* ===================================
   BASE STYLES
   =================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Saira", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--dark-bg);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    font-feature-settings: "liga" 1, "kern" 1;
    transform: translateZ(0);
    will-change: transform;
}

/* Typography */
p {
    font-size: var(--font-p);
    font-weight: 500;
    color: #cccccc;
}

li {
    font-size: var(--font-li);
    font-weight: 500;
    color: #cccccc;
}

a {
    font-size: var(--font-a);
}

i, pre {
    font-size: var(--font-i);
}

table {
    font-size: var(--font-table);
    font-weight: 400;
}

h1 {
    font-size: var(--font-h1);
    font-weight: 700;
}

h2 {
    font-size: var(--font-h2);
    font-weight: 600;
}

h3 {
    font-size: var(--font-h3);
    font-weight: 500;
    color: var(--accent-blue);
}

h4 {
    font-size: var(--font-h4);
    font-weight: 500;
}

/* ===================================
   LAYOUT CONTAINER
   =================================== */
.container {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* ===================================
   NAVBAR
   =================================== */
.navbar {
    background-color: var(--main-bg);
    padding: 5px 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    position: relative;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    width: 24px;
    height: 24px;
}

.logo-text {
    display: flex;
    align-items: center;
    gap: 8px;
}

.typewriter {
    font-family: "Saira", sans-serif;
    white-space: pre;
    position: relative;
    font-optical-sizing: auto;
    font-weight: 500;
    color: #fff;
    font-size: 1.2rem;
}

.typewriter::after {
    content: "_";
    margin-left: 2px;
    animation: blink 1s steps(1) infinite;
}

@keyframes blink {
    50% { opacity: 0; }
}

.nav-links {
    display: flex;
    margin-right: -20px;
}

.nav-links ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
}

.nav-links li {
    position: relative;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 600;
    padding: 10px 15px;
    border-radius: 5px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 5px;
}

.nav-links a:hover {
    color: var(--color-green);
    background-color: rgba(0, 255, 0, 0.1);
}

/* Dropdown Styles */
.dropdown {
    position: relative;
}

.dropdown > a {
    cursor: pointer;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 5px);
    right: 10%;
    transform: translateY(-20px);
    background-color: var(--card-bg);
    min-width: 320px;
    border-radius: 8px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-color);
    opacity: 0;
    visibility: hidden;
    transform-origin: top center;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    z-index: 1001;
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    max-height: 0;
    overflow: hidden;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    max-height: 500px;
}

.dropdown-menu li {
    list-style: none;
    margin: 0;
    padding: 0;
    width: 100%;
    display: block;
}

.dropdown-menu li a {
    display: block;
    padding: 14px 20px;
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid rgba(59, 63, 84, 0.3);
    transition: all 0.2s ease;
    white-space: nowrap;
}

.dropdown-menu li:first-child a {
    border-radius: 8px 8px 0 0;
}

.dropdown-menu li:last-child a {
    border-bottom: none;
    border-radius: 0 0 8px 8px;
}

.dropdown-menu li a:hover {
    background-color: rgba(0, 255, 0, 0.1);
    color: var(--color-green);
    transform: translateX(5px);
}

.fa-chevron-down {
    transition: transform 0.3s ease;
    font-size: 0.75rem;
    margin-left: 5px;
}

.dropdown:hover .fa-chevron-down {
    transform: rotate(180deg);
}

/* ===================================
   MAIN CONTENT LAYOUT
   =================================== */
.main-content-wrapper {
    display: flex;
    flex-direction: column;
    width: 100%;
    margin: 0 auto;
    padding: 30px 0;
}

.left-column,
.right-column {
    padding: 0 10px;
}

.right-column img {
    width: 100%;
    height: 100%;
}

/* ===================================
   CARDS & CONTENT
   =================================== */
.card {
    background-color: var(--main-bg);
    padding: 20px;
    border-radius: 5px;
    border: 0.1px solid var(--color-green);
    margin-top: 10px;
}

.card-header span {
    padding: 2px 10px;
    border-radius: 20px;
    background-color: var(--color-green);
    color: aliceblue;
}

.content h1 {
    font-weight: 700;
    margin-top: 10px;
    color: var(--color-green);
}

.content p,
.card p {
    width: 100%;
    text-align: justify;
}

.card-image img {
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 5px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    margin: 10px 0;
    border: 1px solid var(--border-color);
}

.card-image-output {
    border-radius: 5px;
    border: 1px solid var(--border-color);
    margin: 10px 0;
}

.card-image-output img {
    display: block;
    width: 100%;
    object-fit: cover;
}

.card-image-output p {
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
    padding-left: 15px;
    background-color: var(--dark-bg);
    color: white;
    margin: 0;
}

/* Learning Objectives */
.learning-objectives-card .card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.learning-objectives-card .card-header i {
    color: yellow;
}

.learning-objectives-card h2 {
    color: #f0f0f0;
    margin: 0;
}

.objective-item {
    background-color: rgba(0, 255, 0, 0.05);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid rgba(0, 255, 0, 0.2);
}

.objective-item i {
    color: var(--color-green);
    margin-bottom: 15px;
}

.objective-item p {
    color: var(--text-color);
}

.objective-item strong {
    color: #f0f0f0;
}

.objective-item a {
    color: #ccc;
    text-decoration: none;
}

.objective-item a:hover {
    color: var(--color-green);
    text-decoration: underline;
}

/* Linux Card */
.linux-card,
.module-summary {
    background-color: var(--main-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--color-green);
    margin-bottom: 20px;
}

.linux-card .card-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
    margin-bottom: 15px;
}

.linux-card .card-header h2 {
    color: var(--dark-green);
}

.linux-card h3 {
    color: var(--accent-blue);
    margin-bottom: 5px;
    margin-top: 10px;
    font-weight: 450;
}

.linux-card h4 {
    font-weight: 550;
    color: red;
    margin-bottom: 3px;
    margin-top: 5px;
}

.linux-card .content {
    margin: 10px 0;
}

.linux-card ul {
    margin-top: 5px;
    color: var(--color-green);
}

.linux-card ul li,
.linux-card ol li {
    margin-bottom: 5px;
    color: #ccc;
    position: relative;
}

.linux-card ul li {
    list-style: none;
}

.linux-card ul li::before {
    font-family: "Font Awesome 6 Free";
    content: "\f101";
    margin-right: 5px;
    color: var(--color-green);
    font-weight: 550;
}

.module-summary.linux-card ul li::before {
    content: "✅";
    margin-right: 5px;
}

.linux-card .image {
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 5px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    margin-top: 5px;
    border: 1px solid var(--border-color);
}

.linux-card .pro-tips p {
    background-color: rgba(0, 255, 0, 0.05);
    border-left: 4px solid var(--color-green);
    padding: 10px 15px;
    margin: 20px 0;
    color: #ccc;
    border-radius: 5px;
}

/* Tables */
.linux-card .table-container {
    overflow-x: auto;
    width: 100%;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}

th, td {
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    text-align: left;
    color: #ccc;
}

th {
    background-color: #131c2e;
    font-weight: 600;
}

table code {
    color: var(--color-green);
}

/* Code Blocks */
pre {
    background-color: #1A2130;
    border-radius: 10px;
    border: 1px solid #2d3748;
    font-family: "Fira Code", "Ubuntu Mono", "DejaVu Sans Mono", "Consolas", "Courier New", monospace;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    transform: translateZ(0);
    backface-visibility: hidden;
    margin-bottom: 10px;
    overflow: auto;
    padding: 10px;
    margin-top: 5px;
    margin-bottom: 7px;
    cursor: pointer;
    font-size: 0.8rem;
}

pre code span {
    max-width: 700px;
    color: #ccc;
    font-weight: 400;
}

code {
    font-family: "Fira Code", "Ubuntu Mono", "DejaVu Sans Mono", "Consolas", "Courier New", monospace;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    transform: translateZ(0);
    backface-visibility: hidden;
}

.code-p {
    font-weight: 600;
    margin-top: 10px;
    margin-bottom: 5px;
    color: #708090;
}

code.code-bg,
code.color {
    background-color: #1A2130;
    padding: 5px;
    border-radius: 5px;
    color: var(--color-green);
    font-size: 0.8rem;
}

ol {
    padding-left: 17px;
}

pre.bg-color {
    background-color: #1A2130;
    color: var(--terminal-text);
    border: 1px solid var(--terminal-border);
}

code.code-red {
    color: red;
}

#chapter-5 ul li a {
    color: var(--color-navy);
    text-decoration: none;
}

#chapter-5 ul li a:hover {
    color: #00ccff;
    text-decoration: underline;
}

.congrats {
    background-color: rgba(0, 255, 0, 0.05);
    border-left: 4px solid yellow;
    padding: 10px 15px;
    margin: 20px 0;
    color: #ccc;
    border-radius: 5px;
}

.upcoming-module {
    background-color: var(--dark-bg);
    padding: 20px;
    border: 1px solid red;
    border-radius: 5px;
    border-left: 5px solid red;
    margin-top: 10px;
}

.upcoming-module h3 {
    margin-top: 0;
    background-color: #007bff;
    border-radius: 15px;
    color: #f0f0f0;
    text-align: center;
    margin-bottom: 10px;
    width: 30%;
}

.upcoming-module p strong {
    color: var(--color-green);
}

.upcoming-module p a {
    text-decoration: underline;
    color: #f0f0f0;
}

.upcoming-module p a:hover {
    color: #00ccff;
}

/* ===================================
   SIDEBAR
   =================================== */
.about-website,
.related-topics,
.related-tags {
    background-color: var(--main-bg);
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--color-green);
}

.about-website h3,
.ad-block h3,
.related-topics h3,
.related-tags h3 {
    color: var(--terminal-output);
    margin-bottom: 15px;
    position: relative;
    padding-bottom: 10px;
    text-align: center;
}

.about-website h3::after,
.ad-block h3::after,
.related-tags h3::after {
    content: "";
    position: absolute;
    width: 98%;
    height: 1px;
    background-color: var(--accent-blue);
    left: 50%;
    transform: translateX(-50%);
    bottom: 0;
    border-radius: 2px;
}

.about-website p {
    color: #ccc;
    text-align: left;
    padding: 10px 0;
}

/* Related Topics */
.related-topics ul {
    list-style: none;
    padding: 0;
    margin-top: 20px;
}

.related-topics ul li {
    border-bottom: 1px solid var(--legend-border);
    padding: 10px 0;
}

.related-topics ul li:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.related-topics .content li {
    display: flex;
    flex-direction: row;
    justify-content: flex-start;
    align-items: center;
    text-align: left;
    gap: 10px;
}

.related-topics p {
    text-decoration-color: var(--color-green);
    text-decoration: underline;
    text-underline-offset: 5px;
}

.related-topics li a {
    color: var(--terminal-output);
    text-decoration: none;
    transition: color 0.3s ease;
    display: block;
    padding: 5px 0;
    text-align: left;
}

.related-topics li i {
    background: rgba(48, 174, 48, 0.509);
    border-radius: 6px;
    padding: 10px;
    transition: padding-left 0.5s ease;
}

.related-topics li:hover {
    padding-left: 8px;
}

.related-topics li:hover i {
    background: var(--color-green);
    color: whitesmoke;
    box-shadow: 0 0 15px rgba(58, 237, 106, 0.5);
}

/* Button Styling */
.button-container {
    margin-top: 35px;
    display: flex;
    justify-content: center;
}

.btn-cyber {
    position: relative;
    background: transparent;
    border: none;
    padding: 12px 30px;
    color: white;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    cursor: pointer;
}

.btn-bg {
    position: absolute;
    inset: 0;
    background: var(--color-green);
    transform: translate(-6px, -6px);
    border-radius: 4px;
    z-index: 1;
    transition: transform 0.2s ease;
}

.btn-border {
    position: absolute;
    inset: 0;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    z-index: 2;
}

.btn-text {
    position: relative;
    z-index: 3;
    display: flex;
    align-items: center;
    gap: 8px;
}

.related-topics .button-container .btn-cyber a {
    color: whitesmoke;
    text-decoration: none;
}

.btn-cyber:hover .btn-bg {
    transform: translate(0, 0);
}

.blink {
    animation: blinker 1s linear infinite;
}

@keyframes blinker {
    50% { opacity: 0; }
}

/* Tags */
.related-tags {
    display: flex;
    flex-direction: column;
}

.related-tags .tag-container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 20px;
    justify-content: center;
}

.related-tags .tag {
    background-color: var(--light-text);
    color: var(--main-bg);
    padding: 8px 15px;
    border-radius: 20px;
    font-weight: 400;
    transition: background-color 0.3s ease, transform 0.1s ease;
    cursor: pointer;
    border: none;
    font-size: 0.9rem;
}

.related-tags a {
    text-decoration: none;
}

.related-tags a:hover .tag {
    background-color: var(--color-green);
    color: var(--light-text);
    transform: translateY(-2px);
}

/* ===================================
   AD PLACEMENT STYLES
   =================================== */

/* Ad Container Base */
.ad-container {
    margin: 20px auto;
    padding: 15px;
    text-align: center;
    background-color: var(--main-bg);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.ad-label {
    display: block;
    font-size: 9px;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 8px;
}

/* Ad Placement Positions */
.ad-header {
    margin: 15px auto 20px;
    max-width: 100%;
}

.ad-in-content {
    margin: 25px auto;
    max-width: 100%;
}

.ad-footer {
    margin: 20px auto 15px;
    max-width: 100%;
}

/* Sidebar Ad (Desktop Only) */
.sidebar-ad-container {
    display: none; /* Hidden on mobile */
    padding: 15px;
    background-color: var(--main-bg);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* Mobile Sticky Ad */
.mobile-sticky-ad {
    display: block;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: var(--main-bg);
    padding: 8px 0;
    text-align: center;
    z-index: 9999;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.5);
    border-top: 2px solid var(--color-green);
}

.ad-close-btn {
    position: absolute;
    top: 6px;
    right: 10px;
    background: rgba(220, 20, 60, 0.85);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 4px 10px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.ad-close-btn:hover {
    background: #DC143C;
    transform: scale(1.1) rotate(90deg);
}

/* Body padding when sticky ad is visible */
body.has-sticky-ad {
    padding-bottom: 80px;
}

/* Ad Block Sizes */
.ad-banner-in-content {
    border: 2px dashed var(--legend-border);
    width: 100%;
    height: 150px;
    background-color: var(--main-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
}

.ad-block.large,
.ad-block.medium,
.ad-block.small {
    border: 2px dashed var(--legend-border);
    width: 100%;
    height: 300px;
    background-color: var(--main-bg);
}

.ad-block.medium {
    height: 250px;
}

.ad-block.small {
    height: 100px;
}

.ad-block img {
    max-width: 100%;
    height: auto;
    border-radius: 5px;
    display: block;
    margin: 0 auto;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
}

/* ===================================
   MOVING BORDER ANIMATION
   =================================== */
@property --glow-deg {
    syntax: "<angle>";
    inherits: true;
    initial-value: -90deg;
}

@property --clr-1 {
    syntax: "<color>";
    inherits: true;
    initial-value: #4285f4;
}

@property --clr-2 {
    syntax: "<color>";
    inherits: true;
    initial-value: #ea4335;
}

@property --clr-3 {
    syntax: "<color>";
    inherits: true;
    initial-value: #fbbc05;
}

@property --clr-4 {
    syntax: "<color>";
    inherits: true;
    initial-value: #34a853;
}

.about-website.moving-border {
    --gradient-glow: var(--clr-1), var(--clr-2), var(--clr-3), var(--clr-4), var(--clr-1);
    position: relative;
    padding: 20px;
    background: #1f1f1f;
    border: 3px solid transparent;
    border-radius: 15px;
    background:
        linear-gradient(#1f1f1f 0 0) padding-box,
        conic-gradient(from var(--glow-deg), var(--gradient-glow)) border-box;
    font-size: 16px;
    font-weight: 500;
    color: #e8eaed;
    cursor: pointer;
    isolation: isolate;
    transition: all 0.3s ease;
    animation: breathe-glow 3s ease-in-out infinite;
}

@keyframes breathe-glow {
    0%, 100% {
        transform: scale(1.0);
        box-shadow: 0 0 0 rgba(255, 255, 255, 0);
    }
    50% {
        transform: scale(1.01);
        box-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
    }
}

/* ===================================
   WALLPAPER & COLOR PALETTE
   =================================== */
.wallpaper,
.color-palette {
    border: 1px solid var(--color-green);
    padding: 10px;
    margin-bottom: 30px;
    border-radius: 5px;
}

.wallpaper h3,
.color-palette h3,
.related-topics h3 {
    color: var(--terminal-output);
    text-align: center;
    background: var(--color-green);
}

.wallpaper p,
.color-palette p,
.related-topics p {
    color: #ccc;
    text-align: center;
    margin-bottom: 15px;
    margin-top: 10px;
}

.image-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    max-width: 800px;
    margin: 0 auto;
    margin-bottom: 20px;
}

.image-card img {
    width: 100%;
    border-radius: 10px;
    object-fit: cover;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

.image-card img:hover {
    transform: scale(1.02);
    border: 1px solid var(--color-green);
}

.button {
    text-align: center;
    margin-bottom: 10px;
}

.button .wallpaper-button,
.button .color-button {
    margin-top: 15px;
    border: 1px dashed var(--color-green);
    color: #fff;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    text-decoration: none;
    font-size: 0.8rem;
}

.button .wallpaper-button:hover,
.button .color-button:hover {
    background-color: var(--color-green);
}

/* Palette Grid */
.palette-grid {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.palette-card {
    background: var(--bg-secondary);
    border: 1px solid var(--terminal-border);
    border-radius: 20px;
    overflow: hidden;
    transition: transform 0.3s ease;
    cursor: pointer;
    position: relative;
}

.palette-card::before {
    content: "";
    position: absolute;
    inset: -2px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-magenta));
    border-radius: 20px;
    opacity: 0;
    transition: 0.3s;
    z-index: -1;
}

.palette-card:hover::before {
    opacity: 0.5;
}

.palette-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.color-wave {
    height: 180px;
    display: flex;
    position: relative;
    overflow: hidden;
}

.wave-bar {
    flex: 1;
    position: relative;
    transition: 0.3s;
    cursor: pointer;
}

.wave-bar:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
    z-index: 10;
}

/* Wave Patterns - 4 Colors */
.color-wave.colors-4 .wave-bar:nth-child(1),
.color-wave.colors-4 .wave-bar:nth-child(4) {
    transform: translateY(-10px);
}

.color-wave.colors-4 .wave-bar:nth-child(2),
.color-wave.colors-4 .wave-bar:nth-child(3) {
    transform: translateY(-35px);
}

.palette-card:hover .color-wave.colors-4 .wave-bar:nth-child(1),
.palette-card:hover .color-wave.colors-4 .wave-bar:nth-child(4) {
    transform: translateY(-20px);
}

.palette-card:hover .color-wave.colors-4 .wave-bar:nth-child(2),
.palette-card:hover .color-wave.colors-4 .wave-bar:nth-child(3) {
    transform: translateY(-45px);
}

/* Wave Patterns - 5 Colors */
.color-wave.colors-5 .wave-bar:nth-child(1),
.color-wave.colors-5 .wave-bar:nth-child(5) {
    transform: translateY(0);
}

.color-wave.colors-5 .wave-bar:nth-child(2),
.color-wave.colors-5 .wave-bar:nth-child(4) {
    transform: translateY(-20px);
}

.color-wave.colors-5 .wave-bar:nth-child(3) {
    transform: translateY(-40px);
}

.palette-card:hover .color-wave.colors-5 .wave-bar:nth-child(1),
.palette-card:hover .color-wave.colors-5 .wave-bar:nth-child(5) {
    transform: translateY(-10px);
}

.palette-card:hover .color-wave.colors-5 .wave-bar:nth-child(2),
.palette-card:hover .color-wave.colors-5 .wave-bar:nth-child(4) {
    transform: translateY(-30px);
}

.palette-card:hover .color-wave.colors-5 .wave-bar:nth-child(3) {
    transform: translateY(-50px);
}

.wave-bar::after {
    content: attr(data-color);
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: 'Source Code Pro', monospace;
    font-size: 10px;
    font-weight: 600;
    color: white;
    background: rgba(0, 0, 0, 0.9);
    padding: 5px 9px;
    border-radius: 6px;
    opacity: 0;
    transition: opacity 0.3s;
    backdrop-filter: blur(10px);
    white-space: nowrap;
    pointer-events: none;
    z-index: 10;
}

.wave-bar:hover::after {
    opacity: 1;
}

.card-info {
    padding: 24px;
    color: var(--terminal-output);
}

.card-title {
    font-size: var(--font-p);
    font-weight: 600;
    letter-spacing: 0.5px;
}

.card-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.tag {
    padding: 4px 12px;
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid rgba(0, 217, 255, 0.3);
    border-radius: 6px;
    font-size: 10px;
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-actions {
    display: flex;
    gap: 8px;
}

.card-btn {
    flex: 1;
    padding: 10px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: #ccc;
    font-size: var(--font-i);
    font-weight: 600;
    font-family: 'Poppins', sans-serif;
    cursor: pointer;
    transition: 0.3s;
}

.card-btn:hover {
    background: var(--main-bg);
    color: var(--light-text);
    border-color: var(--accent-cyan);
}

/* ===================================
   SCROLL UP BUTTON
   =================================== */
#scrollUpBtn {
    position: fixed !important;
    bottom: 36px;
    right: 10px;
    width: 45px;
    height: 45px;
    z-index: 9999;
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    display: none;
}

.progress-circle {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
    shape-rendering: geometricPrecision;
    backface-visibility: hidden;
    -webkit-font-smoothing: antialiased;
}

.progress-circle .bg1 {
    fill: #000000;
    stroke: #eee;
    stroke-width: 1;
}

.progress-circle .progress {
    fill: none;
    stroke: #007bff;
    stroke-width: 1;
    stroke-dasharray: 100, 100;
    stroke-linecap: round;
    transition: stroke-dasharray 0.25s linear;
}

svg {
    image-rendering: optimizeQuality;
    text-rendering: geometricPrecision;
}

.arrow-overlay {
    position: absolute;
    top: 55%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.4rem;
    font-family: Arial, Helvetica, sans-serif;
    color: #e5e7eb;
    pointer-events: none;
    cursor: pointer;
}

/* ===================================
   FOOTER
   =================================== */
.footer {
    position: relative;
    width: 100%;
    background: var(--dark-bg);
    min-height: 100px;
    padding: 20px 50px;
    display: flex;
    justify-content: center;
    flex-direction: column;
    align-items: center;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-blue) 50%, transparent 50%);
    background-size: 20px 2px;
    animation: slidingBorder 1s linear infinite;
}

@keyframes slidingBorder {
    0% { background-position: 0 0; }
    100% { background-position: 20px 0; }
}

.menu {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 10px 0;
    flex-wrap: wrap;
    flex-direction: column;
    gap: 10px;
}

.menu-item {
    list-style: none;
}

.menu-link {
    color: #fff;
    margin: 0 10px;
    display: inline-block;
    transition: 0.5s;
    text-decoration: none;
    opacity: 0.75;
    font-weight: 300;
}

.menu-link:hover {
    opacity: 1;
    text-decoration: underline;
}

.footer p {
    color: #ffffff;
    margin: 15px 0 10px 0;
    text-align: center;
}

/* ===================================
   BREAKPOINT 1: 480px (Large Mobile)
   =================================== */
@media (min-width: 480px) {
    .container {
        max-width: 480px;
        padding: 0 1.25rem;
    }

    .main-content-wrapper {
        padding: 32px 12px;
    }

    .ad-container {
        margin: 22px 12px;
        padding: 16px 12px;
    }

    body.has-sticky-ad {
        padding-bottom: 82px;
    }
}

/* ===================================
   BREAKPOINT 2: 768px (Tablet) - MOST IMPORTANT
   =================================== */
@media (min-width: 768px) {
    .container {
        max-width: 768px;
    }

    :root {
        --font-p: 15px;
        --font-h1: 1.6rem;
        --font-h2: 1.28rem;
        --font-h3: 1.15rem;
        --font-h4: 1.05rem;
        --font-li: 15px;
        --font-a: 15px;
        --font-i: 14px;
        --font-table: 15px;
    }

    p { font-size: var(--font-p); }
    li { font-size: var(--font-li); }
    a { font-size: var(--font-a); }
    i, pre { font-size: var(--font-i); }
    table { font-size: var(--font-table); }
    h1 { font-size: var(--font-h1); font-weight: 700; }
    h2 { font-size: var(--font-h2); font-weight: 600; }
    h3 { font-size: var(--font-h3); font-weight: 500; }
    h4 { font-size: var(--font-h4); font-weight: 500; }
    code { font-size: 14px; }

    .logo img {
        width: 27px;
        height: 27px;
    }

    .navbar .logo {
        font-size: 1.25rem;
    }

    .main-content-wrapper {
        padding: 40px 20px;
    }

    .left-column,
    .right-column {
        padding: 0;
    }

    .button .wallpaper-button,
    .button .color-button {
        font-size: 0.85rem;
    }

    /* Ad Adjustments for Tablet */
    .ad-container {
        margin: 24px 15px;
        padding: 18px 15px;
    }

    .ad-header {
        max-width: 468px;
        margin: 18px auto 24px;
    }

    .ad-in-content {
        max-width: 468px;
        margin: 30px auto;
    }

    .ad-footer {
        max-width: 468px;
        margin: 24px auto 18px;
    }

    .sidebar-ad-container {
        display: block;
        position: relative;
        margin: 20px auto;
        max-width: 468px;
    }

    body.has-sticky-ad {
        padding-bottom: 88px;
    }

    #scrollUpBtn {
        width: 45px;
        height: 45px;
        bottom: 65px;
        right: 24px;
    }
}

/* ===================================
   BREAKPOINT 3: 1024px (Desktop) - MOST IMPORTANT
   =================================== */
@media (min-width: 1024px) {
    .container {
        max-width: 1024px;
    }

    :root {
        --font-p: 17px;
        --font-h1: 1.8rem;
        --font-h2: 1.45rem;
        --font-h3: 1.28rem;
        --font-h4: 1.1rem;
        --font-li: 17px;
        --font-a: 16px;
        --font-i: 15px;
        --font-table: 16px;
    }

    p { font-size: var(--font-p); }
    li { font-size: var(--font-li); }
    a { font-size: var(--font-a); }
    i, pre { font-size: var(--font-i); }
    table { font-size: var(--font-table); }
    h1 { font-size: var(--font-h1); font-weight: 700; }
    h2 { font-size: var(--font-h2); font-weight: 600; }
    h3 { font-size: var(--font-h3); font-weight: 500; }
    h4 { font-size: var(--font-h4); font-weight: 500; }
    code { font-size: 15px; }

    .logo img {
        width: 29px;
        height: 29px;
    }

    .navbar .logo {
        font-size: 1.3rem;
        width: auto;
        justify-content: flex-start;
    }

    .main-content-wrapper {
        display: grid;
        grid-template-columns: 70% 30%;
        gap: 20px;
        padding: 20px;
    }

    .right-column {
        display: flex;
        flex-direction: column;
        gap: 20px;
        margin-right: 20px;
    }

    .button .wallpaper-button,
    .button .color-button {
        font-size: 0.95rem;
    }

    .menu {
        flex-direction: row;
    }

    /* Ad Adjustments for Desktop */
    .ad-container {
        margin: 28px auto;
        padding: 20px;
    }

    .ad-header {
        max-width: 728px;
        margin: 20px auto 28px;
    }

    .ad-in-content {
        max-width: 728px;
        margin: 35px auto;
    }

    .ad-footer {
        max-width: 728px;
        margin: 28px auto 20px;
    }

    .sidebar-ad-container {
        display: block;
        position: sticky;
        top: 80px;
        width: 280px;
        max-width: 280px;
        margin: 20px 0 20px 20px;
    }

    .mobile-sticky-ad {
        display: none !important;
    }

    body.has-sticky-ad {
        padding-bottom: 0 !important;
    }

    #scrollUpBtn {
        width: 50px;
        height: 50px;
        bottom: 65px;
        right: 20px;
    }
}

/* ===================================
   BREAKPOINT 4: 1280px (Large Desktop)
   =================================== */
@media (min-width: 1280px) {
    .container {
        max-width: 1280px;
    }

    :root {
        --font-p: 17.5px;
        --font-h1: 1.82rem;
        --font-h2: 1.52rem;
        --font-h3: 1.32rem;
        --font-h4: 1.15rem;
        --font-li: 18px;
        --font-a: 16.5px;
        --font-i: 15.5px;
        --font-table: 16.5px;
    }

    p { font-size: var(--font-p); }
    li { font-size: var(--font-li); }
    a { font-size: var(--font-a); }
    i, pre { font-size: var(--font-i); }
    table { font-size: var(--font-table); }
    h1 { font-size: var(--font-h1); font-weight: 700; }
    h2 { font-size: var(--font-h2); font-weight: 600; }
    h3 { font-size: var(--font-h3); font-weight: 500; }
    h4 { font-size: var(--font-h4); font-weight: 500; }
    code { font-size: 15.5px; }

    .logo img {
        width: 32px;
        height: 32px;
    }

    .navbar .logo {
        font-size: 1.4rem;
    }

    .button .wallpaper-button,
    .button .color-button {
        font-size: 1rem;
    }

    /* Ad Adjustments for Large Desktop */
    .ad-container {
        margin: 30px auto;
        padding: 22px;
    }

    .ad-header {
        max-width: 970px;
        margin: 22px auto 30px;
    }

    .ad-in-content {
        max-width: 728px;
        margin: 38px auto;
    }

    .ad-footer {
        max-width: 728px;
        margin: 30px auto 22px;
    }

    .sidebar-ad-container {
        width: 300px;
        max-width: 300px;
        margin: 20px 0 20px 25px;
    }

    #scrollUpBtn {
        width: 53px;
        height: 53px;
        bottom: 75px;
        right: 32px;
    }
}

/* ===================================
   BREAKPOINT 5: 1440px (Extra Large)
   =================================== */
@media (min-width: 1440px) {
    .container {
        max-width: 1440px;
    }

    :root {
        --font-p: 18px;
        --font-h1: 1.875rem;
        --font-h2: 1.55rem;
        --font-h3: 1.39rem;
        --font-h4: 1.2rem;
        --font-li: 18.5px;
        --font-a: 17px;
        --font-i: 16px;
        --font-table: 17px;
    }

    p { font-size: var(--font-p); }
    li { font-size: var(--font-li); }
    a { font-size: var(--font-a); }
    i, pre { font-size: var(--font-i); }
    table { font-size: var(--font-table); }
    h1 { font-size: var(--font-h1); font-weight: 700; }
    h2 { font-size: var(--font-h2); font-weight: 600; }
    h3 { font-size: var(--font-h3); font-weight: 500; }
    h4 { font-size: var(--font-h4); font-weight: 500; }
    code { font-size: 16px; }

    /* Ad Adjustments for Extra Large */
    .ad-container {
        margin: 32px auto;
        padding: 24px;
    }

    .ad-header {
        max-width: 970px;
        margin: 24px auto 32px;
    }

    .ad-in-content {
        max-width: 728px;
        margin: 40px auto;
    }

    .ad-footer {
        max-width: 728px;
        margin: 32px auto 24px;
    }

    .sidebar-ad-container {
        width: 300px;
        margin: 20px 0 20px 30px;
    }
}

/* ===================================
   RESPONSIVE AD SIZING
   =================================== */
@media (max-width: 991px) {
    .ad-container ins.adsbygoogle {
        max-width: 100% !important;
        width: 100% !important;
        height: auto !important;
    }
}

/* ===================================
   PRINT STYLES
   =================================== */
@media print {
    .ad-container,
    .ad-header,
    .ad-in-content,
    .ad-footer,
    .sidebar-ad-container,
    .mobile-sticky-ad {
        display: none !important;
    }

    body {
        padding-bottom: 0 !important;
    }
}

/* ===================================
   ACCESSIBILITY
   =================================== */
@media (prefers-reduced-motion: reduce) {
    .ad-close-btn,
    .sidebar-ad-container {
        transition: none;
    }

    * {
        animation: none !important;
        transition: none !important;
    }
}