:root {
  --bg: #f9f9f9;
  --text: #333;
  --card-bg: #fff;
  --navbar-bg: rgba(255,255,255,0.8);
  --btn-bg: #007bff;
  --btn-hover: #0056b3;
  --disabled-bg: #ccc;
  --progress-bg: #e0e0e0;
  --progress-fill: #4facfe;
  --answer-bg: #f5f5f5;
  --border: #ddd;
  --footer: #666;
}
body {
    font-family: 'Poppins', sans-serif;
    color: var(--text);
    background: var(--bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 100vh;
    margin: 0;
    padding-top: 3rem;
}
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--navbar-bg);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    padding: 0.5rem 1rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.navbar form {
    margin: 0;
}
.nav-right {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}
.brand {
    font-weight: bold;
}
.container {
    width: 100%;
    max-width: 700px;
    margin-top: 3rem;
    padding: 0 1rem;
    box-sizing: border-box;
}
.card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
.header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.container h1 {
    margin-top: 0;
}
.form-group {
    margin-bottom: 1rem;
}
button {
    width: 100%;
    padding: 0.75rem;
    background: var(--btn-bg);
    border: none;
    color: white;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
}
button:hover {
    background: var(--btn-hover);
}
button:disabled {
    background: var(--disabled-bg);
    cursor: not-allowed;
}
.navbar button {
    width: auto;
    padding: 0.25rem 0.75rem;
}
.mode-buttons button {
    width: auto;
    padding: 0.25rem 0.75rem;
}
.mode-buttons button.active {
    background: var(--btn-hover);
}
.mode-buttons {
    display: flex;
    gap: 0.5rem;
}
.progress {
    width: 100%;
    background: var(--progress-bg);
    border-radius: 4px;
    overflow: hidden;
    height: 20px;
    margin-top: 1rem;
}
.progress div {
    height: 100%;
    width: 0;
    background: var(--progress-fill);
    transition: width 0.2s;
}
.table-wrapper {
    max-height: 300px;
    overflow-y: auto;
    overflow-x: auto;
    margin-top: 1rem;
}
#results-table {
    width: 100%;
    border-collapse: collapse;
}
#results-table th, #results-table td {
    border: 1px solid var(--border);
    padding: 0.5rem;
    vertical-align: top;
}
#timer {
    margin-top: 0.5rem;
}
.answer {
    margin-top: 1.5rem;
    white-space: pre-wrap;
    background: var(--answer-bg);
    padding: 1rem;
    border-radius: 4px;
    border: 1px solid var(--border);
}
.error {
    color: red;
    text-align: center;
    margin-bottom: 1rem;
}
.message {
    color: green;
    text-align: center;
    margin-bottom: 1rem;
}
.filters {
    margin-bottom: 1rem;
    text-align: center;
}
.filters a {
    margin: 0 0.5rem;
}
.filters .selected {
    font-weight: bold;
}
.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--btn-bg);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    animation: spin 1s linear infinite;
    margin: 1rem auto 0 auto;
}
.actions {
    margin-top: 1rem;
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}
.actions button {
    width: auto;
    flex: 1;
}
.footer {
    text-align: center;
    margin-top: auto;
    margin-bottom: 2rem;
    color: var(--footer);
}
#drop-area {
    border: 2px dashed var(--btn-bg);
    padding: 0.5rem;
    height: 80px;
    text-align: center;
    cursor: pointer;
}
#drop-area.dragover {
    background: #eef6ff;
}
.token-info {
    font-size: 0.8rem;
    color: var(--footer);
    margin-top: 0.25rem;
}
.credit-bar {
    width: 150px;
    height: 6px;
    background: var(--progress-bg);
    border-radius: 3px;
    overflow: hidden;
}
#credit-fill {
    height: 100%;
    width: 100%;
    background: var(--btn-bg);
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}
.toast {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    background: rgba(0,0,0,0.8);
    color: #fff;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    z-index: 1000;
}
@media (max-width: 600px) {
    body {
        padding-top: 4rem;
    }
    .navbar {
        flex-direction: column;
        align-items: flex-start;
    }
    .nav-right {
        justify-content: center;
        width: 100%;
    }
}