app/static/styles.css

/* 🌙 Dark Theme Base Styles */
:root {
    --bg-dark: #121212;
    --bg-light: #1e1e1e;
    --text-light: #ffffff;
    --text-muted: #b0b0b0;
    --primary-color:  #F1F1F2;
    --secondary-color: #A1D6E2;
    --error-color : red;
    --border-color: #333;
    --hover-color: #A1D6E2;
}

/* 🌐 Global Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.6;
}

a {
    color: var(--text-muted);
    text-decoration: none;
    margin: 0 10px;
    transition: color 0.3s;
}

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

/* 🔝 Navigation Bar */
.navbar {
    background: var(--bg-light);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid var(--border-color);
}

.navbar h1 {
    color: var(--text-light);
    font-size: 1.8rem;
}

.navbar ul {
    list-style: none;
    display: flex;
    gap: 1rem;
}

.navbar ul li {
    display: inline;
}

.navbar ul li a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    padding: 0.5rem 1rem;
    transition: color 0.3s;
}

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

/* 📌 Card Component */
/* Card Transition Animation */
.card {
    background: var(--bg-light);
    padding: 2rem;
    margin: 5rem auto;
    max-width: 400px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0px 4px 10px rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-color);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card h2 {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.card p {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.card .upload-btn {
    display: block;
    width: 100%;
    background: var(--secondary-color);
    border: none;
    color: var(--bg-dark);
    padding: 10px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    border-radius: 5px;
    transition: background 0.3s;
    text-decoration: none;
}

.card .upload-btn:hover {
    background: var(--primary-color);
}
.card .a {
    color: var(--text-muted);
    text-decoration: none;
    margin: 0 10px;
    transition: color 0.3s;
}
.card .a:hover {
    color: var(--primary-color);
}

/* 🔘 Buttons */
.btn {
    display: inline-block;
    padding: 12px 20px;
    font-size: 1rem;
    font-weight: bold;
    border-radius: 5px;
    border: none;
    cursor: pointer;
    text-align: center;
    transition: background 0.3s, transform 0.2s;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--bg-dark);
}

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

.btn-secondary {
    background: var(--secondary-color);
    color: var(--bg-dark);
    margin-left: 10px;
}

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

.btn:active {
    transform: scale(0.95);
}

/* 📏 Separator Line */
.separator {
    height: 2px;
    background: var(--border-color);
    margin: 2rem 0;
}

/* 📌 Footer */
.footer {
    background: var(--bg-light);
    padding: 1rem;
    text-align: center;
    border-top: 2px solid var(--border-color);
    margin: 5rem auto;
}

.footer h2 {
    color: var(--text-light);
    text-align: left;
}
.footer p {
    color: var(--text-light);
    text-align: left;
}
.footer ul li {
    display: inline;
    margin : 5px 5px;
}

.footer ul li a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    padding: 0.5rem 1rem;
    transition: color 0.3s;
}

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

/* Error Message */
.error {
    color: var(--error-color);
    font-size: 1rem;
    margin-top: 10px;
}

/* Upload Input Styling */
input[type="file"] {
    display: block;
    margin: 10px auto;
    padding: 10px;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    color: var(--text-light);
    cursor: pointer;
}

/* Preview Image Styling */
.preview-image {
    width: 100%;
    max-width: 300px;
    height: auto;
    display: block;
    margin: 20px auto;
    border-radius: 10px;
    border: 2px solid var(--border-color);
    transition: border-color 0.3s;
}

.preview-image.preview-active {
    border-color: var(--secondary-color);
}