:root {
    --primary-color: #4361ee;
    --secondary-color: #3a0ca3;
    --accent-color: #4cc9f0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gray-color: #6c757d;
    --light-gray: #e9ecef;
    --success-color: #4bb543;
    --warning-color: #ffb142;
    --danger-color: #ff5252;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #f5f7fb;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: var(--transition);
}

a:hover {
    color: var(--secondary-color);
}

ul {
    list-style: none;
}

button {
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
}

input {
    font-family: 'Poppins', sans-serif;
}

header {
    background-color: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--dark-color);
}

.logo span {
    color: var(--primary-color);
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 25px;
}

nav ul li a {
    color: var(--dark-color);
    font-weight: 500;
    font-size: 1rem;
    padding: 5px 0;
    position: relative;
}

nav ul li a:hover {
    color: var(--primary-color);
}

nav ul li a.active {
    color: var(--primary-color);
}

nav ul li a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--dark-color);
}

.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 30px 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.highlight {
    color: var(--accent-color);
}

.calculator {
    padding: 40px 0;
}

.calculator-card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 30px;
    max-width: 600px;
    margin: 0 auto;
}

.calculator h3 {
    text-align: center;
    margin-bottom: 25px;
    font-size: 1.8rem;
    color: var(--dark-color);
}

.calculator-tabs {
    display: flex;
    margin-bottom: 25px;
    border-bottom: 1px solid var(--light-gray);
}

.tab-btn {
    background: none;
    border: none;
    padding: 10px 20px;
    font-size: 1rem;
    font-weight: 500;
    color: var(--gray-color);
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

.tab-content .tab-pane p {
    margin-bottom: 15px;
    color: var(--gray-color);
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark-color);
}

.input-group input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(67, 97, 238, 0.2);
}

.ratio-inputs {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.ratio-inputs .input-group {
    flex: 1;
    margin-bottom: 0;
}

.ratio-separator {
    margin: 0 15px;
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--gray-color);
    margin-top: 22px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 25px;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: var(--transition);
    width: 100%;
    margin-bottom: 20px;
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 10px 20px;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
}

.result-box {
    background-color: var(--light-color);
    border-radius: var(--border-radius);
    padding: 20px;
    margin-top: 10px;
    display: flex;
    flex-direction: column;
}

.result-box p {
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.result-box p:last-child {
    margin-bottom: 0;
}

.result-box span {
    font-weight: 600;
    color: var(--primary-color);
}

.result-preview, .result-box .result-preview {
    min-height: 120px;
    background-color: rgba(67, 97, 238, 0.05);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
    padding: 20px;
}

.ratio-inner, .result-box .ratio-inner {
    background-color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 500;
    border-radius: 4px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.result-details {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 10px;
}

#resize-result .result-preview {
    position: relative;
}

#resize-result .result-preview::before {
    content: '';
    position: absolute;
    border: 2px dashed var(--light-gray);
    width: 50px;
    height: 50px;
    z-index: 0;
}

#resize-result .ratio-inner {
    z-index: 1;
}

.platforms {
    padding: 60px 0;
    background-color: white;
}

.platforms h3 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 1.8rem;
    color: var(--dark-color);
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 30px;
}

.platform-card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 25px;
    text-align: center;
    transition: var(--transition);
    display: block;
    color: var(--dark-color);
}

.platform-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.platform-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    color: white;
}

.platform-icon svg {
    width: 30px;
    height: 30px;
}

.instagram {
    background: linear-gradient(45deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888);
}

.facebook {
    background-color: #3b5998;
}

.twitter {
    background-color: #000000;
}

.youtube {
    background-color: #ff0000;
}

.tiktok {
    background-color: #000000;
}

.linkedin {
    background-color: #0077B5;
}

.snapchat {
    background-color: #FFFC00;
    color: black !important;
}

.pinterest {
    background-color: #E60023;
}

.reddit {
    background-color: #FF4500;
}

.twitch {
    background-color: #6441A4;
}

.platform-card h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.platform-card p {
    color: var(--gray-color);
    font-size: 0.9rem;
}

.platform-selection {
    margin-bottom: 25px;
}

.platform-selection label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark-color);
}

.platform-select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: 'Poppins', sans-serif;
    background-color: white;
    color: var(--dark-color);
    transition: var(--transition);
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236c757d' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 15px center;
    background-size: 15px;
}

.platform-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(67, 97, 238, 0.2);
}

.platform-options {
    margin-bottom: 25px;
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    padding: 20px;
    background-color: var(--light-color);
}

.platform-options-heading {
    font-weight: 500;
    margin-bottom: 15px;
    color: var(--dark-color);
}

.placeholder-text {
    text-align: center;
    padding: 20px;
    color: var(--gray-color);
    font-style: italic;
}

.platform-options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 15px;
}

.platform-option-card {
    display: flex;
    align-items: center;
    background-color: white;
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    padding: 12px;
    cursor: pointer;
    transition: var(--transition);
}

.platform-option-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--box-shadow);
}

.platform-option-card.active {
    border-color: var(--primary-color);
    background-color: rgba(67, 97, 238, 0.05);
    box-shadow: 0 0 0 2px rgba(67, 97, 238, 0.2);
}

.option-icon {
    font-size: 1.8rem;
    margin-right: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.option-info {
    flex: 1;
}

.option-name {
    font-weight: 500;
    margin-bottom: 3px;
}

.option-ratio, .option-dimensions {
    font-size: 0.85rem;
    color: var(--gray-color);
    display: flex;
    align-items: center;
}

.benefits {
    padding: 60px 0;
}

.benefits h3 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 1.8rem;
    color: var(--dark-color);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 30px;
}

.benefit-card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 25px;
    text-align: center;
    transition: var(--transition);
}

.benefit-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.benefit-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: rgba(67, 97, 238, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: var(--primary-color);
}

.benefit-icon svg {
    width: 30px;
    height: 30px;
}

.benefit-card h4 {
    font-size: 1.2rem;
    margin-bottom: 15px;
}

.benefit-card p {
    color: var(--gray-color);
    font-size: 0.95rem;
}

footer {
    background-color: var(--dark-color);
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 40px;
}

.footer-logo h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
}

.footer-logo span {
    color: var(--primary-color);
}

.footer-logo p {
    color: rgba(255, 255, 255, 0.7);
    max-width: 300px;
}

.footer-links {
    display: flex;
    gap: 60px;
}

.footer-column h4 {
    font-size: 1.1rem;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-column h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background-color: var(--primary-color);
}

.footer-column ul li {
    margin-bottom: 10px;
}

.footer-column ul li a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-column ul li a:hover {
    color: white;
}

.copyright {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

.platform-page-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 60px 0;
}

.platform-page-header h2 {
    margin-bottom: 15px;
    font-size: 2.2rem;
}

.platform-page-header p {
    max-width: 800px;
    opacity: 0.9;
}

.ratios-list {
    padding: 60px 0;
}

.ratios-list h3 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 1.8rem;
}

.ratio-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.ratio-card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 25px;
    text-align: center;
}

.ratio-card h4 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.ratio-preview {
    width: 100%;
    height: 180px;
    background-color: var(--light-gray);
    margin-bottom: 20px;
    border-radius: var(--border-radius);
    overflow: hidden;
    position: relative;
}

.result-preview-inner {
    background-color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 500;
    border-radius: 4px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.ratio-inner {
    position: absolute;
    background-color: #4361ee;
    border-radius: 4px;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 500;
}

.ratio-card p {
    color: var(--gray-color);
    font-size: 0.95rem;
    margin-bottom: 15px;
}

.dimensions-list {
    background-color: var(--light-color);
    border-radius: var(--border-radius);
    padding: 15px;
    margin-bottom: 20px;
}

.dimensions-list li {
    margin-bottom: 8px;
    display: flex;
    justify-content: space-between;
}

.dimensions-list li:last-child {
    margin-bottom: 0;
}

.dimensions-list .dimension-name {
    font-weight: 500;
}

.resource-page-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 50px 0;
    margin-bottom: 20px;
}

.resource-page-header .header-content {
    max-width: 900px;
    margin: 0 auto;
}

.resource-page-header h2 {
    font-size: 2.2rem;
    margin-bottom: 15px;
    font-weight: 700;
}

.resource-page-header p {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 800px;
}

.ratio-section {
    padding: 20px 0;
    background-color: #f8f9fa;
}

.ratio-section .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.ratio-section h3 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 1.8rem;
    color: #212529;
}

.ratio-display {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    align-items: center;
    justify-content: center;
    margin-bottom: 40px;
    background-color: white;
    border-radius: 8px;
    padding: 30px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.ratio-visualization {
    flex: 0 0 400px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.ratio-box {
    position: relative;
    width: 400px;
    height: 300px;
    background-color: #4361ee;
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-size: 2rem;
    font-weight: 700;
    box-shadow: 0 4px 15px rgba(67, 97, 238, 0.3);
}

.ratio-box-1-1 {
    width: 350px;
    height: 350px;
}

.ratio-box-16-9 {
    width: 400px;
    height: 225px;
}

.ratio-box-3-2 {
    width: 400px;
    height: 267px;
}

.ratio-box-3-4 {
    width: 300px;
    height: 400px;
}

.ratio-box-2-1 {
    width: 400px;
    height: 200px;
}

.ratio-box-4-5 {
    width: 400px;
    height: 500px;
}

.ratio-box-9-16 {
    width: 300px;
    height: 533px;
}

.ratio-box-2-3 {
    width: 300px;
    height: 450px;
}

.ratio-inner-label {
    position: absolute;
    font-size: 2rem;
    font-weight: 700;
    color: white;
    z-index: 2;
}

.ratio-dimension-label {
    position: absolute;
    bottom: -30px;
    font-size: 1rem;
    color: #4361ee;
    font-weight: 500;
}

.ratio-dimension-label.vertical {
    transform: rotate(-90deg);
    left: -50px;
    bottom: 140px;
}

.ratio-explanation {
    flex: 1;
    min-width: 300px;
}

.ratio-explanation p {
    margin-bottom: 20px;
    line-height: 1.7;
}

.ratio-quick-facts {
    background-color: #f8f9fa;
    border-left: 4px solid #4361ee;
    padding: 15px 20px;
    border-radius: 0 8px 8px 0;
    margin-top: 30px;
}

.ratio-quick-facts li {
    margin-bottom: 10px;
    line-height: 1.6;
}

.size-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.size-card {
    background-color: white;
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.size-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.size-card h4 {
    margin-bottom: 15px;
    font-size: 1.2rem;
    color: #212529;
}

.size-visual {
    width: 100%;
    height: 0;
    padding-bottom: 75%;
    background-color: #4361ee;
    border-radius: 8px;
    margin-bottom: 15px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.size-card .size-visual[data-dimensions="1080 × 1080"],
.size-card .size-visual[data-dimensions="400 × 400"],
.size-card .size-visual[data-dimensions="300 × 300"],
.size-card .size-visual[data-dimensions="3000 × 3000"],
.size-card .size-visual[data-dimensions="2400 × 2400"],
.size-card .size-visual[data-dimensions="512 × 512"] {
    padding-bottom: 100%;
}

.size-card .size-visual[data-dimensions="1280 × 720"],
.size-card .size-visual[data-dimensions="1920 × 1080"],
.size-card .size-visual[data-dimensions="2560 × 1440"],
.size-card .size-visual[data-dimensions="3840 × 2160"],
.size-card .size-visual[data-dimensions="5120 × 2880"],
.size-card .size-visual[data-dimensions="7680 × 4320"] {
    padding-bottom: 56.25%;
}

.size-card .size-visual[data-dimensions="720 × 1280"],
.size-card .size-visual[data-dimensions="1080 × 1920"],
.size-card .size-visual[data-dimensions="2160 × 3840"] {
    padding-bottom: 177.78%;
}

.size-card .size-visual[data-dimensions="1600 × 1067"],
.size-card .size-visual[data-dimensions="3000 × 2000"],
.size-card .size-visual[data-dimensions="6000 × 4000"],
.size-card .size-visual[data-dimensions="1200 × 800"],
.size-card .size-visual[data-dimensions="2400 × 1600"],
.size-card .size-visual[data-dimensions="8256 × 5504"] {
    padding-bottom: 66.67%;
}

.size-card .size-visual[data-dimensions="1080 × 1350"],
.size-card .size-visual[data-dimensions="800 × 1000"],
.size-card .size-visual[data-dimensions="1200 × 1500"],
.size-card .size-visual[data-dimensions="2400 × 3000"],
.size-card .size-visual[data-dimensions="3264 × 4080"],
.size-card .size-visual[data-dimensions="4800 × 6000"] {
    padding-bottom: 125%;
}

.size-card .size-visual[data-dimensions="1200 × 600"],
.size-card .size-visual[data-dimensions="1600 × 800"],
.size-card .size-visual[data-dimensions="2400 × 1200"],
.size-card .size-visual[data-dimensions="3840 × 1920"],
.size-card .size-visual[data-dimensions="6000 × 3000"] {
    padding-bottom: 50%;
}

.size-card .size-visual[data-dimensions="600 × 800"],
.size-card .size-visual[data-dimensions="900 × 1200"],
.size-card .size-visual[data-dimensions="1080 × 1440"],
.size-card .size-visual[data-dimensions="1800 × 2400"],
.size-card .size-visual[data-dimensions="2700 × 3600"],
.size-card .size-visual[data-dimensions="3000 × 4000"] {
    padding-bottom: 133.33%; 
}

.size-card .size-visual[data-dimensions="640 × 480"],
.size-card .size-visual[data-dimensions="800 × 600"],
.size-card .size-visual[data-dimensions="1024 × 768"],
.size-card .size-visual[data-dimensions="1280 × 960"],
.size-card .size-visual[data-dimensions="1600 × 1200"],
.size-card .size-visual[data-dimensions="2048 × 1536"] {
    padding-bottom: 75%;
}

.size-card .size-visual[data-dimensions="1000 × 1500"],
.size-card .size-visual[data-dimensions="640 × 960"],
.size-card .size-visual[data-dimensions="1080 × 1620"],
.size-card .size-visual[data-dimensions="1200 × 1800"],
.size-card .size-visual[data-dimensions="2000 × 3000"],
.size-card .size-visual[data-dimensions="2700 × 4000"] {
    padding-bottom: 150%;
}

.size-label {
    color: white;
    font-weight: 600;
    text-align: center;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.1rem;
    white-space: nowrap;
}

.size-visual::after {
    content: none !important;
}

.size-card p {
    color: #6c757d;
    font-size: 0.95rem;
    line-height: 1.6;
}

.article {
    padding: 60px 0;
    background-color: white;
}

.article h3 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 1.8rem;
    color: var(--dark-color);
}

.article-content {
    max-width: 900px;
    margin: 0 auto;
}

.article-content h4 {
    color: var(--dark-color);
    font-size: 1.4rem;
    margin: 30px 0 15px;
    border-bottom: 2px solid rgba(67, 97, 238, 0.1);
    padding-bottom: 10px;
}

.article-content h4:first-child {
    margin-top: 0;
}

.article-content h5 {
    color: var(--dark-color);
    font-size: 1.1rem;
    margin: 20px 0 10px;
}

.article-content p {
    margin-bottom: 20px;
    line-height: 1.7;
}

.article-content ul {
    list-style-type: disc;
    margin-left: 1.5em;
    margin-bottom: 20px;
}

.article-content ol {
    list-style-type: decimal;
    margin-left: 1.5em;
    margin-bottom: 20px;
}

.article-content ul li, 
.article-content ol li {
    margin-bottom: 8px;
}

.article-content ul li::marker,
.article-content ol li::marker {
    color: var(--primary-color);
}

.article-content strong {
    font-weight: 600;
    color: var(--dark-color);
}

.article-content em {
    font-style: italic;
}

.article-image {
    text-align: center;
    margin: 30px 0;
}

.main-article-image {
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.centered-image {
    display: block;
    margin-left: auto;
    margin-right: auto;
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.ratio-table-container {
    overflow-x: auto;
    margin: 25px 0 30px;
}

.ratio-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.ratio-table th {
    background-color: var(--primary-color);
    color: white;
    font-weight: 500;
    text-align: left;
    padding: 12px 15px;
}

.ratio-table th:first-child {
    border-top-left-radius: 8px;
}

.ratio-table th:last-child {
    border-top-right-radius: 8px;
}

.ratio-table td {
    padding: 12px 15px;
    border-bottom: 1px solid var(--light-gray);
}

.ratio-table tr:nth-child(even) {
    background-color: rgba(67, 97, 238, 0.05);
}

.ratio-table tr:hover {
    background-color: rgba(67, 97, 238, 0.1);
}

@media (max-width: 992px) {
    .footer-content {
        flex-direction: column;
    }
    
    .footer-logo {
        margin-bottom: 30px;
    }
    
    .footer-links {
        flex-wrap: wrap;
        gap: 30px;
    }

    .ratio-box {
        width: 300px;
        height: 225px;
    }
    
    .ratio-box-1-1 {
        width: 300px;
        height: 300px;
    }
    
    .ratio-box-16-9 {
        width: 300px;
        height: 169px;
    }
    
    .ratio-box-9-16 {
        width: 169px;
        height: 300px;
    }
    
    .ratio-box-3-2 {
        width: 300px;
        height: 200px;
    }
    
    .ratio-box-4-5 {
        width: 240px;
        height: 300px;
    }
}

@media (max-width: 768px) {
    .hero h2 {
        font-size: 2rem;
    }
    
    nav ul {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background-color: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    }
    
    nav ul.active {
        display: flex;
    }
    
    nav ul li {
        margin: 0 0 15px 0;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 30px;
    }

    .platform-options-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
    
    .result-details {
        grid-template-columns: 1fr;
    }

    .resource-page-header h2 {
        font-size: 1.8rem;
    }
    
    .resource-page-header p {
        font-size: 1rem;
    }
    
    .ratio-display {
        flex-direction: column;
        padding: 20px;
    }
    
    .ratio-visualization {
        flex: 0 0 auto;
        width: 100%;
        max-width: 350px;
        margin-bottom: 30px;
    }
    
    .ratio-box,
    .ratio-box-1-1,
    .ratio-box-16-9,
    .ratio-box-9-16,
    .ratio-box-3-2,
    .ratio-box-4-5,
    .ratio-box-3-4,
    .ratio-box-4-3,
    .ratio-box-2-1,
    .ratio-box-2-3 {
        width: 100%;
        height: 0;
        position: relative;
    }
    
    .ratio-box {
        padding-bottom: 75%;
    }
    
    .ratio-box-1-1 {
        padding-bottom: 100%;
    }
    
    .ratio-box-16-9 {
        padding-bottom: 56.25%; 
    }
    
    .ratio-box-9-16 {
        padding-bottom: 177.78%;
    }
    
    .ratio-box-3-2 {
        padding-bottom: 66.67%;
    }
    
    .ratio-box-4-5 {
        padding-bottom: 125%;
    }

    .ratio-box-2-1 {
        padding-bottom: 50%; 
    }

    .ratio-box-3-4 {
        padding-bottom: 133.33%;
    }

    .ratio-box-2-3 {
        padding-bottom: 150%;
    }

    .ratio-inner-label {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
    }
    
    .ratio-dimension-label.vertical {
        transform: none;
        left: auto;
        bottom: -60px;
    }
    
    .size-cards {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
    
    .ratio-table th, 
    .ratio-table td {
        padding: 10px;
        font-size: 0.85rem;
    }
}

@media (max-width: 576px) {
    .hero {
        padding: 60px 0;
    }
    
    .hero h2 {
        font-size: 1.8rem;
    }
    
    .calculator-card {
        padding: 20px;
    }
    
    .benefit-card {
        padding: 20px;
    }
    
    .platform-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .platform-options-grid {
        grid-template-columns: 1fr;
    }

    .resource-page-header {
        padding: 40px 0;
    }
    
    .resource-page-header h2 {
        font-size: 1.6rem;
    }
    
    .size-cards {
        grid-template-columns: 1fr;
    }
    
    .article-content h4 {
        font-size: 1.2rem;
    }
    
    .article-content h5 {
        font-size: 1rem;
    }
}