@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap');

:root {
    --primary-color: #6a11cb;
    --secondary-color: #2575fc;
    --card-bg-color: #ffffff;
    --text-color: #333;
    --light-text-color: #777;
    --border-color: #e0e4e8;
    --success-color: #20c997;
    --danger-color: #e74c3c;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.07);
}

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

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #e0eafc, #cfdef3);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 40px 20px;
}

.converter-container {
    background-color: var(--card-bg-color);
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    text-align: center;
    width: 100%;
    max-width: 800px;
    transition: all 0.3s ease;
}

.header-icon {
    width: 60px;
    margin-bottom: 15px;
    filter: drop-shadow(0 4px 10px rgba(0,0,0,0.1));
}

h1 {
    font-weight: 700;
    font-size: 2.2rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

p.subtitle {
    color: var(--light-text-color);
    margin-bottom: 30px;
    font-size: 1.1rem;
}

#upload-form { display: block; }

.file-upload-wrapper {
    display: block;
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 40px;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: #fafbff;
}
.file-upload-wrapper:hover, .file-upload-wrapper.dragover {
    border-color: var(--primary-color);
    background-color: #f5f3ff;
    transform: translateY(-5px);
}
.file-upload-wrapper i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}
#file-upload-input { display: none; }
.upload-limit {
    font-size: 0.9rem;
    color: var(--light-text-color);
    margin-top: 10px;
}

#progress-area {
    width: 100%;
    margin-bottom: 20px;
}
#progress-text {
    font-weight: 500;
    margin-bottom: 5px;
}
#current-file-text {
    color: var(--light-text-color);
    font-size: 0.9rem;
    margin-top: 5px;
    min-height: 1.2em;
    font-style: italic;
    transition: all 0.3s ease;
}
.progress-bar {
    width: 100%;
    background-color: var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    margin-top: 10px;
}
.progress {
    width: 0%;
    height: 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 10px;
    transition: width 0.4s ease;
}

.preview-area {
    margin-top: 20px;
    width: 100%;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}
.preview-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.5s forwards;
    display: flex;
    flex-direction: column;
}
@keyframes fadeIn { to { opacity: 1; transform: translateY(0); } }
@keyframes fadeOut { to { opacity: 0; transform: scale(0.9); } }

.preview-image {
    width: 100%;
    height: 150px;
    object-fit: cover;
}
.preview-info {
    padding: 15px;
    text-align: left;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}
.file-name {
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 10px;
}
.action-buttons {
    margin-top: auto;
    display: flex;
    gap: 10px;
}
.action-btn {
    flex-grow: 1;
    padding: 10px;
    border: none;
    border-radius: 8px;
    color: #fff;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}
.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}
.download-btn { background-color: var(--success-color); }
.remove-btn { background-color: var(--danger-color); }