:root {
    --google-blue: #4285F4;
    --google-green: #34A853;
    --google-red: #EA4335;
    --google-yellow: #FBBC05;
    --text-color: #333;
    --bg-color: #f4f4f4;
    --card-bg: #fff;
    --border-color: #ddd;
}

body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: var(--google-blue);
    color: white;
    padding: 1rem;
    text-align: center;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

header h1 {
    margin: 0;
    font-size: 1.8rem;
}

nav {
    display: flex;
    justify-content: center;
    background-color: #e0e0e0;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

nav button {
    background-color: transparent;
    border: none;
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    cursor: pointer;
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

nav button.active {
    background-color: var(--google-blue);
    color: white;
    border-radius: 4px;
}

nav button:not(.active):hover {
    background-color: #d0d0d0;
}

main {
    flex-grow: 1;
    padding: 1.5rem;
    max-width: 960px;
    margin: 20px auto;
    background-color: var(--card-bg);
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.08);
    border-radius: 8px;
}

section {
    display: none;
}

section.active-section {
    display: block;
}

section.hidden-section {
    display: none;
}

.list-container {
    margin-top: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.card:hover {
    transform: translateY(-3px);
}

.card h3 {
    margin-top: 0;
    color: var(--google-blue);
    font-size: 1.2rem;
}

.card p {
    font-size: 0.9rem;
    color: #555;
}

.card .links a,
.card .submission-link {
    display: block;
    margin-top: 0.5rem;
    color: var(--google-blue);
    text-decoration: none;
    font-weight: bold;
    transition: color 0.2s ease;
}

.card .links a:hover,
.card .submission-link:hover {
    color: var(--google-green);
}

.submission-form {
    margin-top: 15px;
    padding: 1rem;
    background-color: #f9f9f9;
    border-radius: 5px;
    border: 1px solid #eee;
}

.submission-form label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.submission-form textarea {
    width: 100%;
    padding: 8px;
    margin-bottom: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-sizing: border-box;
    min-height: 80px;
}

.submission-form button {
    background-color: var(--google-green);
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
}

.submission-form button:hover {
    background-color: #2e8b46;
}

/* Buttons */
.sign-in-btn,
.sign-out-btn,
.sync-btn {
    background-color: var(--google-green);
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.2s ease;
}

.sign-in-btn:hover,
.sign-out-btn:hover,
.sync-btn:hover {
    background-color: #2e8b46;
}

.sync-btn {
    display: block;
    margin: 20px auto 0;
    background-color: var(--google-blue);
}

.sync-btn:hover {
    background-color: #357ae8;
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 1rem;
    margin-top: auto;
    font-size: 0.9rem;
}

/* Offline Submission Card Specifics */
.submission-card {
    background-color: #fff3e0;
    /* Light orange background */
    border-color: #ffb74d;
    /* Darker orange border */
}

.submission-card h3 {
    color: #ff9800;
    /* Orange text */
}

.submission-card .sync-status {
    font-size: 0.85rem;
    color: #777;
    margin-top: 10px;
    font-style: italic;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: #317EFB;
    color: white;
    padding: 1rem;
    text-align: center;
}

main {
    flex-grow: 1;
    padding: 1rem;
    max-width: 800px;
    margin: 20px auto;
    background-color: white;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 1rem;
    margin-top: auto;
}

button {
    background-color: #28a745;
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    margin-top: 15px;
}

button:hover {
    background-color: #218838;
}

#dataOutput {
    margin-top: 20px;
    padding: 15px;
    background-color: #e9ecef;
    border-radius: 5px;
    border: 1px solid #dee2e6;
}