/* Base Styles */
:root {
    --primary-color: #4361ee;
    --primary-dark: #3a56d4;
    --secondary-color: #3f37c9;
    --accent-color: #4895ef;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gray-color: #6c757d;
    --light-gray: #e9ecef;
    --success-color: #4bb543;
    --error-color: #ff3333;
    --border-radius: 8px;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f7fb;
    color: var(--dark-color);
    line-height: 1.6;
}

header {
    position: relative;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 1200px;
    margin: 0 auto;
    background-color: white;
    box-shadow: var(--box-shadow);
}

/* Header Styles */
.app-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--light-gray);
    background-color: white;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.logo i {
    font-size: 1.75rem;
}

.progress-steps {
    display: flex;
    justify-content: space-between;
    position: relative;
}

.progress-steps::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--light-gray);
    z-index: 1;
    transform: translateY(-50%);
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    z-index: 2;
    color: var(--gray-color);
    transition: var(--transition);
}

.step.active {
    color: var(--primary-color);
}

.step-number {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--light-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    margin-bottom: 0.5rem;
    transition: var(--transition);
}

.step.active .step-number {
    background-color: var(--primary-color);
    color: white;
}

.step-title {
    font-size: 0.875rem;
    font-weight: 500;
}

/* Main Content Styles */
.app-main {
    flex: 1;
    padding: 2rem;
}

.step-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

.step-content.active {
    display: block;
}

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

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

/* Welcome Step */
.welcome-container {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 0;
}

.welcome-container h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--dark-color);
}

.subtitle {
    font-size: 1.25rem;
    color: var(--gray-color);
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.feature-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

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

.feature-card i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--gray-color);
    font-size: 0.9375rem;
}

.start-btn {
    margin-bottom: 2rem;
}

.supported-formats p {
    color: var(--gray-color);
    font-size: 0.875rem;
}

/* Upload Step */
.upload-container {
    max-width: 800px;
    margin: 0 auto;
}

.upload-area {
    border: 2px dashed var(--light-gray);
    border-radius: var(--border-radius);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 2rem;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background-color: rgba(67, 97, 238, 0.05);
}

.upload-area i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.upload-area h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.upload-area p {
    color: var(--gray-color);
    margin: 1rem 0;
}

.file-requirements {
    margin-top: 1.5rem;
    font-size: 0.875rem;
    color: var(--gray-color);
}

.upload-details {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--box-shadow);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.file-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
}

.file-icon i {
    font-size: 2rem;
    color: var(--primary-color);
}

.file-meta {
    flex: 1;
}

.file-meta h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-progress {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.progress-bar {
    flex: 1;
    height: 8px;
    background-color: var(--light-gray);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--primary-color);
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    font-size: 0.875rem;
    color: var(--gray-color);
    min-width: 40px;
}

/* Convert Step */
.convert-container {
    max-width: 1200px;
    margin: 0 auto;
}

.video-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.original-video,
.preview-video {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--box-shadow);
}

.conversion-settings {
    grid-column: span 2;
    background-color: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--box-shadow);
}

.settings-form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark-color);
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(67, 97, 238, 0.2);
}

.range-value {
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--gray-color);
}

.trim-controls {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.btn-trim {
    padding: 0.5rem 1rem;
    background-color: var(--light-gray);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.btn-trim:hover {
    background-color: #d1d7e0;
}

.trim-values {
    font-size: 0.875rem;
    color: var(--gray-color);
    margin-left: 0.5rem;
}

video {
    width: 100%;
    border-radius: var(--border-radius);
    background-color: #000;
    margin-bottom: 1rem;
}

.video-info {
    font-size: 0.875rem;
    color: var(--gray-color);
}

.video-info p {
    margin-bottom: 0.25rem;
}

.action-buttons {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
}

/* Download Step */
.download-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.download-success {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 3rem 2rem;
    box-shadow: var(--box-shadow);
    margin-bottom: 2rem;
}

.success-icon i {
    font-size: 4rem;
    color: var(--success-color);
    margin-bottom: 1.5rem;
}

.download-success h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.download-success p {
    font-size: 1.125rem;
    color: var(--gray-color);
    margin-bottom: 2rem;
}

.conversion-result {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.result-card {
    background-color: var(--light-gray);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    flex: 1;
    max-width: 250px;
}

.result-card h4 {
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

.result-info p {
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    color: var(--gray-color);
}

.result-arrow i {
    font-size: 1.5rem;
    color: var(--gray-color);
}

.download-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.share-options {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--box-shadow);
}

.share-options h4 {
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

.share-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.btn-share {
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    background-color: white;
    color: var(--dark-color);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-share:hover {
    background-color: var(--light-gray);
}

/* Footer Styles */
.app-footer {
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--light-gray);
    background-color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: var(--gray-color);
}

.footer-links {
    display: flex;
    gap: 1rem;
}

.footer-links a {
    color: var(--gray-color);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-color);
}

/* Button Styles */
.btn-primary {
    padding: 0.875rem 1.75rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.btn-primary:disabled {
    background-color: var(--gray-color);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-secondary {
    padding: 0.875rem 1.75rem;
    background-color: white;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-secondary:hover {
    background-color: rgba(67, 97, 238, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* Responsive Styles */
@media (max-width: 768px) {
    .video-comparison {
        grid-template-columns: 1fr;
    }

    .conversion-settings {
        grid-column: span 1;
    }

    .progress-steps {
        flex-wrap: wrap;
        gap: 1rem;
    }

    .step {
        flex: 1 0 calc(50% - 1rem);
    }

    .download-actions {
        flex-direction: column;
    }

    .conversion-result {
        flex-direction: column;
    }

    .result-card {
        max-width: 100%;
        width: 100%;
    }
}

@media (max-width: 480px) {

    .app-header,
    .app-main,
    .app-footer {
        padding: 1rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .step-title {
        display: none;
    }

    .upload-area {
        padding: 2rem 1rem;
    }
}