:root {
    --background: hsl(0, 0%, 100%);
    --foreground: hsl(222.2, 84%, 4.9%);
    --card: hsl(0, 0%, 100%);
    --card-foreground: hsl(222.2, 84%, 4.9%);
    --primary: hsl(222.2, 47.4%, 11.2%);
    --primary-foreground: hsl(210, 40%, 98%);
    --secondary: hsl(210, 40%, 96.1%);
    --secondary-foreground: hsl(222.2, 47.4%, 11.2%);
    --muted: hsl(210, 40%, 96.1%);
    --muted-foreground: hsl(215.4, 16.3%, 46.9%);
    --accent: hsl(210, 40%, 96.1%);
    --accent-foreground: hsl(222.2, 47.4%, 11.2%);
    --border: hsl(214.3, 31.8%, 91.4%);
    --ring: hsl(222.2, 84%, 4.9%);
    --radius: 0.5rem;
    --gradient-focus: radial-gradient(1200px 400px at 50% 0%, hsla(217.2, 91.2%, 59.8%, 0.25), transparent 60%);
    --shadow-elevated: 0 20px 40px -20px hsla(222.2, 84%, 4.9%, 0.25);
    --transition-smooth: all 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
    :root {
        --background: hsl(222.2, 84%, 4.9%);
        --foreground: hsl(210, 40%, 98%);
        --card: hsl(222.2, 84%, 4.9%);
        --card-foreground: hsl(210, 40%, 98%);
        --primary: hsl(210, 40%, 98%);
        --primary-foreground: hsl(222.2, 47.4%, 11.2%);
        --secondary: hsl(217.2, 32.6%, 17.5%);
        --secondary-foreground: hsl(210, 40%, 98%);
        --muted: hsl(217.2, 32.6%, 17.5%);
        --muted-foreground: hsl(215, 20.2%, 65.1%);
        --accent: hsl(217.2, 32.6%, 17.5%);
        --accent-foreground: hsl(210, 40%, 98%);
        --border: hsl(217.2, 32.6%, 17.5%);
        --ring: hsl(212.7, 26.8%, 83.9%);
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--background);
    color: var(--foreground);
    line-height: 1.5;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.header {
    text-align: center;
    margin-bottom: 3rem;
}

.header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary), var(--ring));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--muted-foreground);
    max-width: 600px;
    margin: 0 auto;
}

.converter-section {
    margin-top: 2rem;
}

.dropzone {
    position: relative;
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    background-color: var(--card);
    padding: 3rem 2rem;
    text-align: center;
    transition: var(--transition-smooth);
    cursor: pointer;
}

.dropzone:hover {
    border-color: var(--ring);
}

.dropzone.is-dragover {
    border-color: var(--ring);
    background-color: var(--accent);
}

.dropzone-background {
    position: absolute;
    inset: -2px;
    border-radius: var(--radius);
    background-image: var(--gradient-focus);
    opacity: 0;
    filter: blur(20px);
    transition: var(--transition-smooth);
    pointer-events: none;
    z-index: -1;
}

.dropzone.is-dragover .dropzone-background {
    opacity: 1;
    filter: blur(16px);
}

.dropzone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.icon-container {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3.5rem;
    height: 3.5rem;
    background-color: var(--secondary);
    border-radius: calc(var(--radius) - 2px);
}

.icon {
    width: 1.75rem;
    height: 1.75rem;
    color: var(--secondary-foreground);
}

.dropzone h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
}

.dropzone p {
    color: var(--muted-foreground);
    font-size: 0.875rem;
    max-width: 400px;
    margin: 0;
}

.btn {
    background-color: var(--primary);
    color: var(--primary-foreground);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-smooth);
    margin-top: 0.5rem;
}

.btn:hover {
    opacity: 0.9;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.result-container {
    margin-top: 1.5rem;
}

.result-card {
    background-color: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-elevated);
}

.download-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    text-decoration: none;
    color: inherit;
    transition: var(--transition-smooth);
}

.download-link:hover {
    background-color: var(--accent);
}

.thumbnail {
    width: 4rem;
    height: 4rem;
    object-fit: cover;
    border-radius: calc(var(--radius) - 2px);
    flex-shrink: 0;
}

.file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex: 1;
    gap: 1rem;
    min-width: 0;
}

.file-details {
    min-width: 0;
    flex: 1;
}

.file-name {
    font-weight: 500;
    margin: 0 0 0.25rem 0;
    word-break: break-all;
}

.file-size {
    font-size: 0.875rem;
    color: var(--muted-foreground);
    margin: 0;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--secondary);
    color: var(--secondary-foreground);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-smooth);
    flex-shrink: 0;
}

.download-btn:hover {
    background-color: var(--accent);
}

.download-icon {
    width: 1rem;
    height: 1rem;
}

.toast {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    background-color: var(--card);
    color: var(--card-foreground);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    box-shadow: var(--shadow-elevated);
    transform: translateY(100px);
    opacity: 0;
    transition: var(--transition-smooth);
    z-index: 1000;
    max-width: 400px;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.loading {
    opacity: 0.6;
    pointer-events: none;
}

@media (max-width: 640px) {
    .container {
        padding: 1rem;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .dropzone {
        padding: 2rem 1rem;
    }
    
    .file-info {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .download-btn {
        align-self: stretch;
        justify-content: center;
    }
}
/* ================== PAGE LAYOUT & ADSENSE STYLES ================== */

/* Main 3-column grid for ads and content */
.page-wrapper {
    display: grid;
    grid-template-columns: 160px 1fr 160px; /* Left Ad | Main Content | Right Ad */
    gap: 1.5rem;
    align-items: flex-start;
    padding: 0 1rem;
    max-width: 1300px;
    margin: 0 auto;
}

.content-area {
    min-width: 0; /* Prevents flexbox/grid overflow issues */
}

/* Adjust original container to fit inside the new layout */
.container {
    padding-top: 0;
    padding-bottom: 0;
}

/* Top and Bottom horizontal ad banners */
.ad-container-top,
.ad-container-bottom {
    margin: 1.5rem auto;
    text-align: center;
    min-height: 90px;
    max-width: 970px;
    padding: 0 1rem;
}

/* Left and Right vertical side banners */
.ad-container-side {
    width: 160px; /* Standard vertical ad width */
    min-height: 600px; /* Standard vertical ad height */
    position: sticky; /* Makes ads stay in view on scroll */
    top: 1.5rem;
}

/* ================== RESPONSIVE STYLES FOR SMALLER SCREENS ================== */

@media (max-width: 1200px) {
    /* Switch to a single column layout */
    .page-wrapper {
        grid-template-columns: 1fr;
    }

    /* Hide the side ads on smaller screens */
    .ad-container-side {
        display: none;
    }

    .container {
        padding: 1rem;
    }
}