:root {
--primary-color: #4361ee;
--secondary-color: #3f37c9;
--accent-color: #4cc9f0;
--success-color: #4CAF50;
--background-color: #f8f9ff;
--text-color: #2b2d42;
--light-gray: #edf2fb;
--card-gradient: linear-gradient(135deg, #ffffff 0%, #f8f9ff 100%);
--hero-gradient: linear-gradient(135deg, #4361ee 0%, #4cc9f0 100%);
--benefit-gradient: linear-gradient(135deg, #4361ee 0%, #3f37c9 100%);
}
/* Dark theme variables and system color hints */
:root {
--dark-bg: #0a0a0a;
--dark-surface: #1a1a1a;
--text-primary: #f8fafc;
--text-secondary: #94a3b8;
--border-color: #2d2d2d;
--primary-hover: #2563eb;
--warning-color: #f59e0b;
--error-color: #ef4444;
--shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.6), 0 2px 4px -1px rgba(0, 0, 0, 0.4);
color-scheme: light dark;
}
/* Theme overrides when [data-theme="dark"] is set on */
html[data-theme="dark"] {
--background-color: var(--dark-bg);
--text-color: var(--text-primary);
--primary-color: #3b82f6;
--secondary-color: #94a3b8;
--accent-color: #1d4ed8;
--light-gray: #121212;
--card-gradient: linear-gradient(135deg, #1a1a1a 0%, #151515 100%);
--hero-gradient: linear-gradient(135deg, #0b1221 0%, #0a0f1e 100%);
--benefit-gradient: linear-gradient(135deg, #1d4ed8 0%, #2563eb 100%);
}
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
line-height: 1.6;
color: var(--text-color);
background-color: var(--background-color);
}
.container {
max-width: 1200px;
margin: 0 auto;
padding: 0 20px;
}
/* Navbar Styles */
.navbar {
background: rgba(255, 255, 255, 0.95);
-webkit-backdrop-filter: blur(10px);
backdrop-filter: blur(10px);
box-shadow: 0 2px 15px rgba(67, 97, 238, 0.1);
position: fixed;
width: 100%;
top: 0;
z-index: 1000;
}
html[data-theme="dark"] .navbar {
background: rgba(10, 10, 10, 0.85);
box-shadow: 0 2px 15px rgba(0, 0, 0, 0.6);
}
.navbar .container {
display: flex;
justify-content: space-between;
align-items: center;
padding: 1rem 20px;
}
.navbar h1 {
font-size: 1.5rem;
background: var(--hero-gradient);
-webkit-background-clip: text;
background-clip: text;
color: transparent;
font-weight: 700;
}
/* Improve brand contrast in dark theme */
html[data-theme="dark"] .navbar h1 {
background: none;
-webkit-background-clip: initial;
background-clip: initial;
color: var(--text-primary);
text-shadow: 0 1px 1px rgba(0, 0, 0, 0.6);
}
.navbar ul {
display: flex;
list-style: none;
gap: 2rem;
}
.navbar a {
text-decoration: none;
color: var(--text-color);
font-weight: 500;
transition: color 0.3s ease;
position: relative;
}
.navbar a::after {
content: '';
position: absolute;
width: 0;
height: 2px;
bottom: -4px;
left: 0;
background: var(--hero-gradient);
transition: width 0.3s ease;
}
.navbar a:hover::after {
width: 100%;
}
/* Hero Section */
.hero-section {
padding: 8rem 0 4rem;
text-align: center;
background: var(--hero-gradient);
color: white;
position: relative;
overflow: hidden;
}
.hero-section::before {
content: '';
position: absolute;
top: -50%;
left: -50%;
width: 200%;
height: 200%;
z-index: 0;
background: url('data:image/svg+xml,') repeat;
opacity: 0.5;
background-size: 400px 400px;
background-position: 0 0;
animation: starScroll 30s linear infinite, twinkle 7s ease-in-out infinite alternate;
animation-delay: 0s, 1.2s;
will-change: background-position;
}
.hero-section::after {
content: '';
position: absolute;
top: -50%;
left: -50%;
width: 200%;
height: 200%;
z-index: 0;
background: url('data:image/svg+xml,') repeat;
opacity: 0.4;
background-size: 600px 600px;
background-position: 0 0;
animation: starScrollSlow 60s linear infinite, twinkle 9s ease-in-out infinite alternate;
animation-delay: 0s, 0.6s;
will-change: background-position;
}
.hero-section .container {
position: relative;
z-index: 1;
}
.hero-section h2 {
font-size: 2.5rem;
margin-bottom: 1rem;
position: relative;
}
/* Upload Container */
.upload-container {
max-width: 600px;
margin: 2rem auto;
position: relative;
}
.drop-zone {
background: rgba(255, 255, 255, 0.9);
border: 2px dashed var(--accent-color);
border-radius: 15px;
padding: 3rem;
text-align: center;
cursor: pointer;
transition: all 0.3s ease;
-webkit-backdrop-filter: blur(5px);
backdrop-filter: blur(5px);
position: relative;
}
.format-controls {
display: flex;
justify-content: center;
gap: 0.5rem;
align-items: center;
margin-top: 1rem;
}
.format-controls .form-select {
max-width: 260px;
width: 100%;
background-color: #ffffff;
color: #1f2937;
border: 1px solid rgba(0, 0, 0, 0.12);
border-radius: 10px;
padding: 0.6rem 0.8rem;
box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}
html[data-theme="dark"] .format-controls .form-select {
background-color: #111827;
color: var(--text-primary);
border-color: var(--border-color);
}
.format-label {
font-size: 0.95rem;
color: #374151;
}
html[data-theme="dark"] .format-label {
color: var(--text-secondary);
}
.visually-hidden {
position: absolute !important;
height: 1px; width: 1px;
overflow: hidden;
clip: rect(1px, 1px, 1px, 1px);
white-space: nowrap;
}
.drop-zone:hover {
background: white;
transform: translateY(-2px);
box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}
/* Improve visibility of drop zone text */
.drop-zone p {
color: #1f2937; /* Dark slate for light background */
font-weight: 600;
}
/* Hide native file input while keeping it accessible and clickable */
.drop-zone input[type="file"] {
position: absolute;
left: 0;
top: 0;
width: 100%;
height: 100%;
opacity: 0;
cursor: pointer;
}
/* Dark theme drop zone for better contrast */
html[data-theme="dark"] .drop-zone {
background: rgba(17, 24, 39, 0.9); /* slate-900 with opacity */
border-color: var(--primary-color);
}
html[data-theme="dark"] .drop-zone p {
color: var(--text-primary);
}
/* Benefits Section */
.benefits-section {
padding: 4rem 0;
background: linear-gradient(to bottom right, #ffffff, #f8f9ff);
position: relative;
overflow: hidden;
}
html[data-theme="dark"] .benefits-section {
background: linear-gradient(to bottom right, #0f0f0f, #121212);
}
.benefits-section::before {
content: '';
position: absolute;
width: 100%;
height: 100%;
background: url('data:image/svg+xml,') repeat;
}
.benefits-section h2 {
text-align: center;
color: var(--text-color);
margin-bottom: 2rem;
font-size: 2.2rem;
position: relative;
}
.benefits-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
gap: 2rem;
margin-top: 2rem;
position: relative;
}
.benefit-card {
background: var(--card-gradient);
padding: 2rem;
border-radius: 15px;
box-shadow: 0 4px 15px rgba(67, 97, 238, 0.1);
transition: transform 0.3s ease, box-shadow 0.3s ease;
border: 1px solid rgba(67, 97, 238, 0.1);
position: relative;
overflow: hidden;
}
html[data-theme="dark"] .benefit-card {
box-shadow: var(--shadow);
border-color: var(--border-color);
}
.benefit-card::before {
content: '';
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 4px;
background: var(--benefit-gradient);
opacity: 0;
transition: opacity 0.3s ease;
}
.benefit-card:hover {
transform: translateY(-5px);
box-shadow: 0 8px 25px rgba(67, 97, 238, 0.15);
}
.benefit-card:hover::before {
opacity: 1;
}
.benefit-card h3 {
color: var(--primary-color);
margin-bottom: 1rem;
font-size: 1.4rem;
}
.benefit-card p {
color: var(--text-color);
font-size: 1.1rem;
line-height: 1.6;
}
/* FAQ Section */
.faq-section {
padding: 4rem 0;
background: white;
position: relative;
}
html[data-theme="dark"] .faq-section {
background: var(--dark-surface);
}
.faq-section::before {
content: '';
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: url('data:image/svg+xml,') repeat;
opacity: 0.5;
}
.faq-grid {
max-width: 800px;
margin: 2rem auto;
position: relative;
}
details {
background: var(--card-gradient);
padding: 1rem;
margin-bottom: 1rem;
border-radius: 10px;
cursor: pointer;
border: 1px solid rgba(67, 97, 238, 0.1);
transition: all 0.3s ease;
}
details:hover {
box-shadow: 0 4px 15px rgba(67, 97, 238, 0.1);
}
html[data-theme="dark"] details {
box-shadow: var(--shadow);
border-color: var(--border-color);
}
summary {
font-weight: 600;
margin: -1rem;
padding: 1rem;
color: var(--primary-color);
position: relative;
}
summary::-webkit-details-marker {
display: none;
}
summary::after {
content: '+';
position: absolute;
right: 1rem;
transition: transform 0.3s ease;
}
details[open] summary::after {
transform: rotate(45deg);
}
details[open] {
background: white;
}
html[data-theme="dark"] details[open] {
background: #1c1c1c;
}
details[open] summary {
margin-bottom: 1rem;
border-bottom: 1px solid rgba(67, 97, 238, 0.1);
}
/* Features Section */
.features-section {
padding: 4rem 0;
background: linear-gradient(to bottom right, #f8f9ff, #ffffff);
position: relative;
overflow: hidden;
}
html[data-theme="dark"] .features-section {
background: linear-gradient(to bottom right, #0f0f0f, #121212);
}
.features-section::before {
content: '';
position: absolute;
width: 100%;
height: 100%;
background: url('data:image/svg+xml,') repeat;
}
.features-section h2 {
text-align: center;
color: var(--text-color);
margin-bottom: 2rem;
font-size: 2.2rem;
position: relative;
}
.features-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
gap: 2rem;
margin-top: 2rem;
}
.feature-card {
background: var(--card-gradient);
padding: 2rem;
border-radius: 15px;
text-align: center;
box-shadow: 0 4px 15px rgba(67, 97, 238, 0.1);
transition: transform 0.3s ease, box-shadow 0.3s ease;
border: 1px solid rgba(67, 97, 238, 0.1);
position: relative;
overflow: hidden;
}
html[data-theme="dark"] .feature-card,
html[data-theme="dark"] .step,
html[data-theme="dark"] .comparison-item,
html[data-theme="dark"] .tips-grid article {
box-shadow: var(--shadow);
border-color: var(--border-color);
}
.feature-card::before {
content: '';
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 4px;
background: var(--benefit-gradient);
opacity: 0;
transition: opacity 0.3s ease;
}
.feature-card:hover {
transform: translateY(-5px);
box-shadow: 0 8px 25px rgba(67, 97, 238, 0.15);
}
.feature-card:hover::before {
opacity: 1;
}
.feature-card h3 {
color: var(--primary-color);
margin-bottom: 1rem;
font-size: 1.4rem;
}
.feature-card p {
color: var(--text-color);
font-size: 1.1rem;
line-height: 1.6;
}
/* Comparison Section */
.comparison-section {
padding: 4rem 0;
background: white;
position: relative;
}
html[data-theme="dark"] .comparison-section {
background: var(--dark-surface);
}
.comparison-section::before {
content: '';
position: absolute;
width: 100%;
height: 100%;
background: url('data:image/svg+xml,') repeat;
opacity: 0.5;
}
.comparison-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
gap: 2rem;
margin-top: 2rem;
}
.comparison-item {
background: var(--card-gradient);
padding: 2rem;
border-radius: 15px;
box-shadow: 0 4px 15px rgba(67, 97, 238, 0.1);
border: 1px solid rgba(67, 97, 238, 0.1);
}
.comparison-item h3 {
color: var(--primary-color);
margin-bottom: 1rem;
font-size: 1.4rem;
}
.comparison-item ul {
list-style: none;
padding: 0;
}
.comparison-item li {
margin-bottom: 0.5rem;
padding-left: 1.5rem;
position: relative;
}
.comparison-item li::before {
content: '•';
color: var(--primary-color);
position: absolute;
left: 0;
font-size: 1.2rem;
}
/* How It Works Section */
.how-it-works-section {
padding: 4rem 0;
background: linear-gradient(to bottom right, #ffffff, #f8f9ff);
position: relative;
overflow: hidden;
}
html[data-theme="dark"] .how-it-works-section {
background: linear-gradient(to bottom right, #0f0f0f, #121212);
}
.how-it-works-section::before {
content: '';
position: absolute;
width: 100%;
height: 100%;
background: url('data:image/svg+xml,') repeat;
}
.steps {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
gap: 2rem;
margin-top: 2rem;
}
.step {
text-align: center;
padding: 2rem;
background: var(--card-gradient);
border-radius: 15px;
box-shadow: 0 4px 15px rgba(67, 97, 238, 0.1);
border: 1px solid rgba(67, 97, 238, 0.1);
transition: transform 0.3s ease;
}
.step:hover {
transform: translateY(-5px);
}
.step-number {
display: inline-block;
width: 40px;
height: 40px;
background: var(--hero-gradient);
color: white;
border-radius: 50%;
line-height: 40px;
margin-bottom: 1rem;
font-weight: bold;
}
.step h3 {
color: var(--primary-color);
margin-bottom: 1rem;
font-size: 1.4rem;
}
.step p {
color: var(--text-color);
font-size: 1.1rem;
}
/* Tips Section */
.tips-section {
padding: 4rem 0;
background: white;
}
html[data-theme="dark"] .tips-section {
background: var(--dark-surface);
}
.tips-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
gap: 2rem;
margin-top: 2rem;
}
.tips-grid article {
background: var(--light-gray);
padding: 2rem;
border-radius: 10px;
}
.tips-grid ul {
list-style: none;
padding: 0;
margin-top: 1rem;
}
.tips-grid li {
padding: 0.5rem 0;
position: relative;
padding-left: 1.5rem;
}
.tips-grid li:before {
content: "•";
color: var(--primary-color);
position: absolute;
left: 0;
}
/* Footer Styles */
footer {
background: linear-gradient(to bottom, #2b2d42, #1a1b2e);
color: #ffffff;
padding: 3rem 0 1.5rem;
margin-top: 4rem;
position: relative;
overflow: hidden;
}
footer::before {
content: '';
position: absolute;
width: 100%;
height: 100%;
top: 0;
left: 0;
background: url('data:image/svg+xml,') repeat;
}
.footer-content {
position: relative;
display: grid;
grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
gap: 2rem;
}
footer h3 {
color: var(--accent-color);
margin-bottom: 1rem;
font-size: 1.2rem;
}
footer p, footer li {
color: rgba(255, 255, 255, 0.8);
margin-bottom: 0.5rem;
font-size: 0.95rem;
}
footer ul {
list-style: none;
padding: 0;
}
footer a {
color: rgba(255, 255, 255, 0.8);
text-decoration: none;
transition: color 0.3s ease;
}
footer a:hover {
color: var(--accent-color);
}
.footer-bottom {
margin-top: 2rem;
padding-top: 1.5rem;
border-top: 1px solid rgba(255, 255, 255, 0.1);
text-align: center;
color: rgba(255, 255, 255, 0.6);
font-size: 0.9rem;
}
/* Responsive Footer */
@media (max-width: 768px) {
.footer-content {
grid-template-columns: 1fr;
gap: 1.5rem;
}
.footer-section {
text-align: center;
}
}
/* Responsive Design */
@media (max-width: 768px) {
.navbar .container {
flex-direction: column;
gap: 1rem;
}
.hero-section h2 {
font-size: 2rem;
}
.features-grid {
grid-template-columns: 1fr;
}
.benefits-grid,
.comparison-grid,
.tips-grid {
grid-template-columns: 1fr;
}
.footer-content {
grid-template-columns: 1fr;
text-align: center;
}
}
/* Animations */
@keyframes fadeIn {
from { opacity: 0; }
to { opacity: 1; }
}
.feature-card, .step, .hero-section {
animation: fadeIn 0.5s ease-in;
}
.benefit-card,
.comparison-item,
.tips-grid article {
animation: fadeInUp 0.5s ease-out;
}
@keyframes fadeInUp {
from {
opacity: 0;
transform: translateY(20px);
}
to {
opacity: 1;
transform: translateY(0);
}
}
/* Starfield animations (background-position scrolling) */
@keyframes starScroll {
from { background-position: 0 0; }
to { background-position: 0 -1000px; }
}
@keyframes starScrollSlow {
from { background-position: 0 0; }
to { background-position: 0 -700px; }
}
/* Subtle opacity pulsing for star twinkle */
@keyframes twinkle {
0% { opacity: 0.35; }
50% { opacity: 0.55; }
100% { opacity: 0.4; }
}
/* GPU-friendly rendering hints */
.benefit-card,
.feature-card,
.step,
.comparison-item,
.tips-grid article {
will-change: transform, opacity;
}
/* SEO Enhancement Classes */
.supported-formats {
color: var(--secondary-color);
margin-top: 1rem;
font-size: 0.9rem;
}
html[data-theme="dark"] .supported-formats {
color: var(--text-secondary);
}
h1, h2, h3 {
color: var(--secondary-color);
margin-bottom: 1rem;
}
h1 {
font-size: 2.5rem;
line-height: 1.2;
}
h2 {
font-size: 2rem;
text-align: center;
margin-bottom: 2rem;
}
h3 {
font-size: 1.5rem;
}
/* Drop zone highlight state */
.drop-zone.highlight {
border-color: var(--primary-color);
transform: translateY(-2px);
box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
}
/* Theme toggle button */
.theme-toggle {
background: transparent;
color: var(--text-color);
border: 1px solid rgba(0, 0, 0, 0.05);
border-radius: 999px;
padding: 0.4rem 0.75rem;
cursor: pointer;
transition: background-color 0.2s ease, transform 0.2s ease;
}
html[data-theme="dark"] .theme-toggle {
border-color: var(--border-color);
}
.theme-toggle:hover {
background: rgba(0, 0, 0, 0.06);
transform: translateY(-1px);
}
html[data-theme="dark"] .theme-toggle:hover {
background: rgba(255, 255, 255, 0.06);
}
/* Toast message for actions */
.message {
position: fixed;
left: 50%;
bottom: 20px;
transform: translateX(-50%);
background: var(--primary-color);
color: #ffffff;
padding: 0.75rem 1rem;
border-radius: 8px;
box-shadow: var(--shadow);
z-index: 2000;
pointer-events: none;
animation: fadeIn 0.25s ease-out;
}
/* Respect reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
* {
animation: none !important;
transition: none !important;
}
}