/* Custom animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* Apply fade-in animation to the main container */
.container>div {
    animation: fadeIn 0.5s ease-in-out;
}

/* Custom focus styles */
input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

/* Custom hover effect for the download button */
button:hover {
    transform: translateY(-1px);
}

/* Smooth transitions */
button,
input {
    transition: all 0.2s ease-in-out;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* Theme variables */
:root {
    /* Light theme (default) */
    --bg-gradient-start: #f6f8fc;
    --bg-gradient-end: #e9f0f7;
    --card-bg: white;
    --text-primary: #1a1a1a;
    --text-secondary: #666;
    --text-tertiary: #4b5563;
    --border-color: #e5e7eb;
    --input-bg: #f9fafb;
    --progress-bg: #e5e7eb;
    --error-bg: #fee2e2;
    --error-border: #fecaca;
    --error-text: #dc2626;
    --shadow-color: rgba(0, 0, 0, 0.08);
    --shadow-hover: rgba(0, 0, 0, 0.12);
    --scrollbar-track: #f1f1f1;
    --scrollbar-thumb: #cbd5e1;
    --scrollbar-thumb-hover: #94a3b8;
}

[data-theme="dark"] {
    --bg-gradient-start: #1a1a1a;
    --bg-gradient-end: #2d2d2d;
    --card-bg: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #a3a3a3;
    --text-tertiary: #9ca3af;
    --border-color: #404040;
    --input-bg: #1a1a1a;
    --progress-bg: #404040;
    --error-bg: #7f1d1d;
    --error-border: #991b1b;
    --error-text: #fecaca;
    --shadow-color: rgba(0, 0, 0, 0.2);
    --shadow-hover: rgba(0, 0, 0, 0.3);
    --scrollbar-track: #2d2d2d;
    --scrollbar-thumb: #404040;
    --scrollbar-thumb-hover: #4d4d4d;
}

/* Theme toggle button */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: 0 2px 8px var(--shadow-color);
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px var(--shadow-hover);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    color: var(--text-primary);
    transition: transform 0.5s ease;
}

.theme-toggle:hover svg {
    transform: rotate(30deg);
}

/* Base styles */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    color: var(--text-primary);
    transition: background 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Card styles */
.download-card {
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow-color);
    padding: 40px;
    margin-bottom: 30px;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
}

.download-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px var(--shadow-hover);
}

/* Header styles */
h1 {
    color: var(--text-primary);
    font-size: 2.5rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 10px;
    background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

.subtitle {
    color: var(--text-secondary);
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: 40px;
}

/* Form styles */
.download-form {
    margin-bottom: 30px;
}

input[type="url"] {
    width: 95%;
    padding: 16px 20px;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--input-bg);
    transition: all 0.3s ease;
    margin-bottom: 20px;
    color: var(--text-primary);
}

input[type="url"]:focus {
    border-color: #3b82f6;
    background: white;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
    outline: none;
}

input[type="url"]::placeholder {
    color: var(--text-tertiary);
}

/* Button styles */
.download-button {
    width: 100%;
    padding: 16px 24px;
    font-size: 1.1rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.download-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(37, 99, 235, 0.3);
}

.download-button:active {
    transform: translateY(0);
}

.download-button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.download-button svg {
    width: 20px;
    height: 20px;
}

/* Progress bar styles */
.progress-container {
    margin-top: 30px;
    padding: 20px;
    background: var(--input-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.progress-bar {
    width: 100%;
    height: 12px;
    background: var(--progress-bg);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 15px;
}

.progress {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, #2563eb 0%, #3b82f6 100%);
    border-radius: 6px;
    transition: width 0.3s ease;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: #4b5563;
}

.progress-info span {
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

/* Error message styles */
.error {
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    color: var(--error-text);
    padding: 16px;
    border-radius: 12px;
    margin-top: 20px;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.error svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* Loading animation */
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid #e5e7eb;
    border-top-color: #3b82f6;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Responsive design */
@media (max-width: 640px) {
    .container {
        padding: 20px 15px;
    }

    .download-card {
        padding: 25px;
    }

    h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    input[type="url"] {
        padding: 14px 16px;
    }

    .download-button {
        padding: 14px 20px;
        font-size: 1rem;
    }
}

/* Custom scrollbar */
::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

/* Features section */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 40px;
    padding: 0 20px;
}

.feature {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 6px var(--shadow-color);
    display: flex;
    align-items: center;
    gap: 12px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px var(--shadow-hover);
}

.feature svg {
    width: 24px;
    height: 24px;
    color: #3b82f6;
    flex-shrink: 0;
}

.feature span {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-tertiary);
}

@media (max-width: 640px) {
    .features {
        grid-template-columns: 1fr;
        padding: 0 10px;
    }

    .feature {
        padding: 15px;
    }
}

/* Preview section styles */
.preview-section {
    margin: 20px 0;
    animation: fadeIn 0.3s ease-out;
}

.preview-container {
    background: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: 0 4px 6px var(--shadow-color);
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--input-bg);
    border-bottom: 1px solid var(--border-color);
}

.preview-header h3 {
    margin: 0;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.preview-close {
    background: none;
    border: none;
    padding: 4px;
    cursor: pointer;
    color: var(--text-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.preview-close:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.preview-close svg {
    width: 20px;
    height: 20px;
}

.preview-content {
    padding: 16px;
}

.preview-video-container {
    position: relative;
    width: 100%;
    padding-top: 177.78%;
    /* 16:9 aspect ratio */
    background: black;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 16px;
}

.preview-video-container video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.preview-info {
    display: flex;
    gap: 16px;
    padding: 12px;
    background: var(--input-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.preview-info-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.preview-info-item svg {
    width: 18px;
    height: 18px;
    color: var(--text-tertiary);
}

@media (max-width: 640px) {
    .preview-content {
        padding: 12px;
    }

    .preview-info {
        flex-direction: column;
        gap: 8px;
    }

    .preview-video-container {
        padding-top: 177.78%;
        /* Maintain 16:9 aspect ratio */
    }
}