:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --error-color: #ef4444;
}

body {
    font-family: "Inter", sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 600px;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 2.5rem;
}

header h1 {
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

header p {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 1.5rem;
}

.sheet-link-btn {
    display: inline-block;
    text-decoration: none;
    background-color: #2f9e44;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 600;
    transition: background-color 0.2s;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.sheet-link-btn:hover {
    background-color: #2b8a3e;
}

.upload-card {
    background: var(--card-bg);
    border-radius: 1rem;
    padding: 2.5rem;
    box-shadow:
        0 4px 6px -1px rgb(0 0 0 / 0.1),
        0 2px 4px -2px rgb(0 0 0 / 0.1);
}

.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 0.75rem;
    padding: 3rem 1.5rem;
    text-align: center;
    transition: all 0.2s ease;
    background-color: #f8fafc;
}

.drop-zone.dragover {
    border-color: var(--primary-color);
    background-color: #eff6ff;
}

.drop-zone .icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 1rem;
}

.drop-zone p {
    margin: 0.5rem 0;
    color: var(--text-secondary);
}

.file-label {
    color: var(--primary-color);
    font-weight: 600;
    cursor: pointer;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.file-label:hover {
    color: var(--primary-hover);
}

.file-name {
    margin-top: 1rem !important;
    font-weight: 600;
    color: var(--text-primary) !important;
}

.text-input {
    width: 100%;
    padding: 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    box-sizing: border-box;
    outline: none;
    transition: border-color 0.2s;
}

.text-input:focus {
    border-color: var(--primary-color);
}

.primary-btn {
    width: 100%;
    padding: 0.875rem;
    margin-top: 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

.primary-btn:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

.primary-btn:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
    opacity: 0.7;
}

.secondary-btn {
    width: 100%;
    padding: 0.875rem;
    background-color: white;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.secondary-btn:hover {
    background-color: #f1f5f9;
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

.status-area {
    margin-top: 2rem;
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.hidden {
    display: none;
}

.loader {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border-color);
    border-bottom-color: var(--primary-color);
    border-radius: 50%;
    display: inline-block;
    animation: rotation 1s linear infinite;
    margin-bottom: 0.5rem;
}

@keyframes rotation {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

#status-message {
    font-weight: 500;
}

#log-details {
    background-color: #1e293b;
    color: #cbd5e1;
    padding: 1rem;
    border-radius: 0.5rem;
    text-align: left;
    font-size: 0.875rem;
    margin-top: 1rem;
    white-space: pre-wrap;
    max-height: 200px;
    overflow-y: auto;
}

.hidden {
    display: none !important;
}