/* Common styles for all pages */
:root {
    --primary-color: #4285f4;
    --secondary-color: #34a853;
    --accent-color: #fbbc05;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --dark-bg: #202124;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-bg);
    padding: 0;
    margin: 0;
}

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

header {
    background-color: white;
    box-shadow: var(--shadow);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
}

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

h1, h2, h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

h1 {
    font-size: 2.2rem;
    margin-top: 1.5rem;
}

h2 {
    font-size: 1.8rem;
    margin-top: 1.2rem;
}

p {
    margin-bottom: 1rem;
}

.card {
    background-color: white;
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 20px;
}

.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s, transform 0.2s;
    text-decoration: none;
}

.btn:hover {
    background-color: #3367d6;
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

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

.btn-secondary:hover {
    background-color: #2d9247;
}

input[type="text"],
input[type="number"],
input[type="file"],
select {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

input[type="checkbox"] {
    margin-right: 10px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.checkbox-label {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
    cursor: pointer;
}

.section {
    margin-bottom: 30px;
}

.link-card {
    display: block;
    padding: 15px;
    margin-bottom: 10px;
    background-color: white;
    border-radius: 8px;
    box-shadow: var(--shadow);
    text-decoration: none;
    color: var(--text-color);
    transition: transform 0.3s;
}

.link-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.link-section {
    margin-bottom: 30px;
}

footer {
    background-color: white;
    padding: 20px 0;
    text-align: center;
    margin-top: 40px;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
}

/* Responsive design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
    }
    
    nav ul {
        margin-top: 15px;
    }
    
    nav ul li {
        margin-left: 10px;
        margin-right: 10px;
    }
}

/* Specific styles for Split Picture Assistant */
.images-container {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    margin-top: 20px;
}

.image-box {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

.image-box:hover {
    transform: scale(1.05);
}

.image-box img {
    display: block;
    max-width: 100%;
    height: auto;
}

.download-btn {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 5px 10px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: background-color 0.3s;
}

.download-btn:hover {
    background-color: rgba(0, 0, 0, 0.9);
}

/* Back to top button */
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--primary-color);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.3s;
    box-shadow: var(--shadow);
}

.back-to-top.visible {
    opacity: 1;
}