:root {
    --primary-color: #0052d4;
    --secondary-color: #f0f2f5;
    --text-color: #333;
    --light-gray: #d9d9d9;
    --white-color: #fff;
    --success-color: #28a745;
    --disabled-bg: #f5f5f5;
    --disabled-color: #aaa;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --border-radius: 10px;
}

/* --- General --- */
body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--secondary-color);
    color: var(--text-color);
    margin: 0;
    line-height: 1.6;
}

.container {
    width: 95%;
    max-width: 1000px;
    margin: 2rem auto;
}

.hidden {
    display: none !important;
}

/* --- Animations --- */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

/* --- Header --- */
header {
    text-align: center;
    padding: 1rem;
    animation: fadeIn 0.5s ease-out;
}

header h1 {
    margin: 0;
    color: var(--primary-color);
}

header p {
    color: #666;
}

/* --- Upload View --- */
.upload-box {
    background-color: var(--white-color);
    border: 3px dashed var(--light-gray);
    border-radius: var(--border-radius);
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    animation: fadeIn 0.7s ease-out;
}

.upload-box:hover,
.upload-box.dragover {
    border-color: var(--primary-color);
    background-color: #f7faff;
    transform: scale(1.02);
}

.upload-icon {
    width: 80px;
    opacity: 0.7;
    transition: transform 0.3s;
}

.upload-box:hover .upload-icon {
    transform: scale(1.1);
}

.separator {
    color: #999;
}

/* --- Processing View --- */
#processing-view {
    animation: fadeIn 0.5s ease-out;
}

.file-info-card {
    position: relative;
    display: flex;
    align-items: center;
    gap: 1rem;
    background-color: var(--white-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

#file-icon {
    width: 60px;
    height: 60px;
}

.file-details p {
    margin: 0;
    font-weight: 600;
}

.file-details p:last-child {
    font-size: 0.9rem;
    color: #666;
}

.btn-cancel {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    font-size: 1.8rem;
    color: #888;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.btn-cancel:hover {
    transform: scale(1.2);
}

/* --- Conversion Panels --- */
.conversion-panels {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-top: 2rem;
}

.panel {
    background-color: var(--white-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border-left: 5px solid var(--light-gray);
    transition: all 0.3s ease;
    animation: fadeIn 0.5s ease-out backwards;
}

.panel.active {
    border-left-color: var(--primary-color);
    box-shadow: var(--box-shadow);
}

.panel.disabled {
    opacity: 0.6;
    background-color: var(--disabled-bg);
    pointer-events: none;
}

.panel-title {
    margin: 0 0 0.5rem 0;
}

.panel-description {
    margin: 0 0 1.5rem 0;
    font-size: 0.95rem;
    color: #555;
}

.action-group {
    display: flex;
    gap: 1rem;
}

/* --- Form Elements --- */
.btn {
    background-color: var(--primary-color);
    color: var(--white-color);
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn:hover:not(:disabled) {
    background-color: #003a9e;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.btn:disabled,
.format-select:disabled {
    background-color: var(--disabled-bg);
    border-color: var(--light-gray);
    color: var(--disabled-color);
    cursor: not-allowed;
}

.format-select {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid var(--light-gray);
    border-radius: 8px;
    font-size: 1rem;
    background-color: var(--white-color);
}

/* --- Result & Loader --- */
.result-container {
    margin-top: 1.5rem;
    padding: 2rem;
    text-align: center;
    background-color: #eaf7ed;
    border-radius: var(--border-radius);
    border: 1px solid var(--success-color);
    animation: fadeIn 0.5s ease-out;
}

.result-message {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--success-color);
}

#loader-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.85);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.loader {
    border: 6px solid var(--light-gray);
    border-top: 6px solid var(--primary-color);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

/* --- Supported Formats Section --- */
.supported-formats-section {
    background-color: var(--white-color);
    padding: 3rem 1rem;
    margin-top: 3rem;
    box-shadow: var(--box-shadow);
    text-align: center;
}

.supported-formats-section h2 {
    color: var(--primary-color);
    margin-bottom: 0.8rem;
    font-size: 2rem;
}

.supported-formats-section > p {
    color: #666;
    max-width: 700px;
    margin: 0 auto 2.5rem auto;
    font-size: 1.1rem;
}

.format-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    text-align: left;
    margin-top: 2rem;
}

.format-category {
    background-color: var(--secondary-color);
    padding: 1.8rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--light-gray);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s ease;
}

.format-category:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.format-category h3 {
    margin-top: 0;
    margin-bottom: 1.2rem;
    color: var(--text-color);
    font-size: 1.35rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.format-category h3 img {
    width: 36px;
    height: 36px;
}

.format-category ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

/* --- Responsive Design --- */
@media (min-width: 768px) {
    .conversion-panels {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
}