:root {
    --primary: #3b82f6;
    /* Modern cool blue SaaS aesthetic */
    --primary-hover: #2563eb;

    /* Light Mode strictly grayscale + light accent */
    --bg-color: #f8fafc;
    --text-color: #0f172a;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --muted-text: #64748b;
    --navbar-bg: #ffffff;
    --footer-bg: #f8fafc;
    /* Keep footer light too */
    --footer-text: #475569;
    --row-hover: #f1f5f9;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
}

body.dark-mode {
    --bg-color: #0f172a;
    --text-color: #f8fafc;
    --card-bg: #1e293b;
    --border-color: #334155;
    --muted-text: #94a3b8;
    --navbar-bg: #1e293b;
    --footer-bg: #0b1120;
    --footer-text: #94a3b8;
    --row-hover: #334155;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    text-decoration: none;
    color: inherit;
}

/* Navbar - Minimalist */
.navbar {
    background-color: var(--navbar-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 0 20px;
    box-shadow: var(--shadow);
    position: relative;
    z-index: 10;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-links a {
    font-weight: 550;
    font-size: 0.95rem;
    color: var(--text-color);
    transition: color 0.2s;
}

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

.mobile-dots-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.4rem;
    color: var(--text-color);
    cursor: pointer;
    padding: 5px;
}

#theme-toggle {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: var(--text-color);
    cursor: pointer;
}

/* Minimal Search Area */
.minimal-search {
    padding: 60px 20px 40px;
    background-color: transparent;
}

.search-container {
    max-width: 750px;
    margin: 0 auto;
}

.main-title {
    text-align: center;
    font-size: 2.8rem;
    margin-bottom: 25px;
    font-weight: 800;
    line-height: 1.2;
}

.page-section {
    padding: 100px 20px;
}

.subtitle {
    font-size: 1.15rem;
    color: var(--muted-text);
    max-width: 650px;
    margin: 0 auto 50px;
}

.search-box-wrapper {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.search-box-wrapper:focus-within {
    transform: translateY(-2px);
    box-shadow: 0 20px 35px -10px rgba(59, 130, 246, 0.15);
}

.search-box {
    display: flex;
    position: relative;
    width: 100%;
}

.search-icon {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--primary);
    font-size: 1.3rem;
}

#video-url {
    flex: 1;
    padding: 22px 22px 22px 60px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1.15rem;
    outline: none;
    transition: border-color 0.3s, box-shadow 0.3s;
}

#video-url:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

/* Result Layout Configuration */
.result-section {
    flex: 1;
    padding: 20px 20px 80px;
}

.page-container {
    max-width: 1050px;
    margin: 0 auto;
}

.split-layout {
    display: flex;
    flex-direction: row;
    gap: 40px;
    align-items: flex-start;
}

/* Left Panel: Download Links */
.left-panel {
    flex: 6;
}

.progress-queue {
    margin-bottom: 25px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.progress-box {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    font-weight: 700;
    margin-bottom: 12px;
    font-size: 1rem;
    color: var(--primary);
}

.progress-track {
    background-color: var(--bg-color);
    height: 8px;
    border-radius: 4px;
    overflow: hidden;
}

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

.format-group-title {
    font-size: 1.15rem;
    padding: 12px 0;
    color: var(--text-color);
    border-bottom: 2px solid var(--border-color);
    margin: 0 0 15px 0;
    font-weight: 700;
}

.link-rows {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.download-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--card-bg);
    transition: all 0.2s;
}

.download-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.active-download {
    border-color: var(--primary);
    background-color: rgba(59, 130, 246, 0.05);
}

.active-download .card-dl-btn {
    opacity: 0.5;
    cursor: default;
}

.card-left {
    flex: 1;
    font-weight: 700;
}

.card-middle {
    flex: 1;
    text-align: center;
    color: var(--muted-text);
    font-size: 0.95rem;
}

.card-right {
    flex: 1;
    display: flex;
    justify-content: flex-end;
}

.card-dl-btn {
    padding: 10px 20px;
    background-color: var(--bg-color);
    color: var(--primary);
    border: 1px solid var(--primary);
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
}

.card-dl-btn:hover {
    background-color: var(--primary);
    color: white;
}

/* Right Panel: Thumbnail Details */
.right-panel {
    flex: 4;
    position: sticky;
    top: 90px;
}

#video-thumbnail {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    display: block;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

#video-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 8px;
    line-height: 1.4;
}

.meta-duration {
    font-size: 0.95rem;
    color: var(--muted-text);
}

/* Artistic Features Section */
.comprehensive-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.detailed-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 40px 30px;
    border-radius: 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.detailed-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.3s;
}

.detailed-card:hover {
    transform: translateY(-12px) scale(1.02);
    border-color: var(--primary);
    box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.1);
}

.detailed-card:hover::before {
    opacity: 1;
}

.step-icon {
    width: 70px;
    height: 70px;
    background-color: var(--bg-color);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: 25px;
    transition: transform 0.3s ease;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

.detailed-card:hover .step-icon {
    transform: rotate(10deg) scale(1.1);
}

.detailed-card h3 {
    font-size: 1.3rem;
    font-weight: 800;
    margin-bottom: 15px;
    color: var(--text-color);
}

.detailed-card p {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--muted-text);
}

/* Base Helpers */
.hidden {
    display: none !important;
}

.empty-state {
    padding: 20px;
    text-align: center;
    color: var(--muted-text);
    font-style: italic;
    border: 1px dashed var(--border-color);
    border-radius: 8px;
}

.alert {
    padding: 14px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.alert-danger {
    background-color: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    color: #10b981;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

/* Footer Enhancement */
.footer {
    border-top: 1px solid var(--border-color);
    background-color: var(--footer-bg);
    padding: 80px 0 40px;
    margin-top: auto;
    color: var(--footer-text);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
}

.footer-about h3 {
    margin-bottom: 20px;
    color: var(--text-color);
    font-size: 1.4rem;
}

.footer-about p {
    line-height: 1.8;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.footer-links h4,
.footer-social h4 {
    margin-bottom: 25px;
    color: var(--text-color);
    text-transform: uppercase;
    font-size: 0.85rem;
    font-weight: 800;
    letter-spacing: 1.5px;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.footer-links a {
    font-size: 0.95rem;
    transition: all 0.2s;
    opacity: 0.8;
}

.footer-links a:hover {
    color: var(--primary);
    opacity: 1;
    transform: translateX(5px);
}

.social-icons {
    display: flex;
    gap: 15px;
}

.social-icons a {
    width: 42px;
    height: 42px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--muted-text);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow);
}

.social-icons a:hover {
    background-color: var(--primary);
    color: white;
    transform: translateY(-5px) rotate(8deg);
    border-color: var(--primary);
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3);
}

.footer-bottom {
    max-width: 1200px;
    margin: 60px auto 0;
    padding: 30px 20px 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.6;
    font-weight: 500;
}

/* Responsive Media Handling */
@media (max-width: 850px) {
    .split-layout {
        flex-direction: column-reverse;
    }

    .left-panel,
    .right-panel {
        width: 100%;
        flex: none;
    }

    .right-panel {
        position: static;
        margin-bottom: 20px;
    }

    .footer-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 50px;
    }

    .social-icons {
        justify-content: center;
    }

    .footer-links a:hover {
        transform: none;
    }
}

/* Professional Content & Legal Pages */
.legal-content h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    text-align: center;
}

.legal-content .subtitle {
    text-align: center;
    margin-bottom: 60px;
}

.legal-content .content-box {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 60px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    line-height: 1.8;
}

.legal-content h3 {
    font-size: 1.4rem;
    font-weight: 800;
    margin: 40px 0 20px;
    color: var(--text-color);
    border-left: 4px solid var(--primary);
    padding-left: 20px;
}

.legal-content p {
    margin-bottom: 20px;
    font-size: 1.05rem;
    color: var(--muted-text);
}

.legal-content ul {
    margin-bottom: 30px;
    padding-left: 20px;
}

.legal-content li {
    margin-bottom: 15px;
    color: var(--muted-text);
}

.about-hero-image img {
    width: 100%;
    height: 450px;
    object-fit: cover;
    border-radius: 24px;
    box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.2);
    margin-bottom: 50px;
}

/* SEO Article Section */
.seo-article-section {
    padding: 80px 0;
    line-height: 1.8;
    color: var(--text-color);
}

.article-content {
    max-width: 900px;
    margin: 0 auto;
}

.article-content h2 {
    font-size: 2.2rem;
    font-weight: 800;
    margin: 60px 0 25px;
    color: var(--text-color);
    letter-spacing: -0.5px;
}

.article-content h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin: 40px 0 20px;
    color: var(--text-color);
}

.article-content p {
    margin-bottom: 25px;
    font-size: 1.1rem;
    color: var(--muted-text);
}

.article-content ul,
.article-content ol {
    margin-bottom: 30px;
    padding-left: 20px;
}

.article-content li {
    margin-bottom: 12px;
    font-size: 1.05rem;
    color: var(--muted-text);
}

/* How to Use Section */
.how-to-section {
    background-color: var(--navbar-bg);
    padding: 100px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 15px;
}

.guide-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
    max-width: 1100px;
    margin: 0 auto;
}

.guide-step {
    background-color: var(--card-bg);
    padding: 35px;
    border-radius: 20px;
    text-align: center;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    position: relative;
}

.step-number {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    background-color: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.1rem;
    box-shadow: 0 4px 10px rgba(59, 130, 246, 0.4);
}

.guide-step i {
    font-size: 2.2rem;
    color: var(--primary);
    margin-bottom: 20px;
}

.guide-step h4 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

/* FAQ Section */
.faq-section {
    padding: 100px 0;
}

.faq-container {
    max-width: 850px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    background-color: var(--card-bg);
}

.faq-item details summary {
    padding: 22px 30px;
    font-weight: 700;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.1rem;
    user-select: none;
}

.faq-item details summary::-webkit-details-marker {
    display: none;
}

.faq-item details summary::after {
    content: '\f078';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 0.9rem;
    transition: transform 0.3s;
    color: var(--primary);
}

.faq-item details[open] summary::after {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 30px 25px;
    color: var(--muted-text);
    line-height: 1.7;
    font-size: 1rem;
}

/* Contact Section */
.contact-section {
    padding: 100px 0;
    background-color: var(--navbar-bg);
    border-top: 1px solid var(--border-color);
}

.contact-card {
    max-width: 600px;
    margin: 0 auto;
    background-color: var(--card-bg);
    padding: 50px;
    border-radius: 24px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    text-align: center;
}

.contact-card h2 {
    margin-bottom: 15px;
    font-weight: 800;
}

.contact-card p {
    color: var(--muted-text);
    margin-bottom: 35px;
}

.contact-form {
    text-align: left;
}

.contact-form .form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 0.9rem;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 14px 18px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    outline: none;
    font-size: 1rem;
    margin-bottom: 20px;
}

.contact-form input:focus,
.contact-form textarea:focus {
    border-color: var(--primary);
}

.contact-form button {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 16px 32px;
    border-radius: 10px;
    font-weight: 700;
    cursor: pointer;
    width: 100%;
    font-size: 1.05rem;
    transition: all 0.3s;
}

.contact-form button:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.2);
}

@media (max-width: 768px) {
    /* Mobile 3-Dot Toggle */
    .mobile-dots-toggle {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: auto;
        background-color: var(--navbar-bg);
        flex-direction: column;
        padding: 30px 0;
        gap: 0;
        transition: left 0.3s ease;
        text-align: center;
        border-top: 1px solid var(--border-color);
        box-shadow: 0 10px 15px rgba(0,0,0,0.1);
        z-index: 999;
        margin-top: 0; /* Reset previous margin */
    }

    .nav-links.active {
        left: 0;
    }

    .nav-links a {
        padding: 16px 0;
        width: 100%;
        display: block;
        font-size: 1.1rem;
        border-bottom: 1px solid var(--border-color);
    }

    #theme-toggle {
        margin-top: 15px;
        font-size: 1.3rem;
    }

    .nav-container {
        flex-direction: row; /* Keep logo and dots side by side */
        justify-content: space-between;
        height: 70px;
        padding: 0 20px;
    }

    /* Hero & Titles Scaling */
    .minimal-search {
        padding: 40px 15px 30px;
    }
    .main-title {
        font-size: 1.8rem;
        margin-bottom: 20px;
    }
    .subtitle {
        font-size: 1rem;
        margin-bottom: 30px;
    }

    /* Fixed Input & Search Box */
    .search-box-wrapper {
        padding: 20px 15px;
    }
    #video-url {
        padding: 16px 16px 16px 45px;
        font-size: 0.95rem;
    }
    .search-icon {
        left: 15px;
        font-size: 1.1rem;
    }

    /* Section Spacing */
    .page-section, 
    .how-to-section, 
    .faq-section, 
    .contact-section,
    .seo-article-section {
        padding: 50px 15px;
    }
    .section-header {
        margin-bottom: 35px;
    }
    .section-header h2 {
        font-size: 1.6rem;
    }

    /* Article Typography Fix */
    .article-content h2 {
        font-size: 1.5rem;
        margin: 40px 0 15px;
        word-wrap: break-word;
    }
    .article-content h3 {
        font-size: 1.25rem;
        margin: 30px 0 12px;
    }
    .article-content p, .article-content li {
        font-size: 1rem;
        line-height: 1.7;
    }

    /* Form & Layout Adjustments */
    .split-layout {
        flex-direction: column-reverse;
        gap: 25px;
    }
    .left-panel, .right-panel {
        width: 100%;
    }
    .right-panel {
        position: static;
    }
    #video-title {
        font-size: 1.1rem;
    }
    
    .contact-card {
        padding: 30px 20px;
    }
    .contact-form button {
        width: 100%;
    }

    /* FAQ Refinement */
    .faq-item details summary {
        padding: 16px 20px;
        font-size: 1rem;
    }

    /* Guide Steps Stacking */
    .guide-steps {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    /* Footer Stacking */
    .footer-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    .footer-links, .footer-social {
        align-items: center;
    }
}

@media (max-width: 480px) {
    .main-title {
        font-size: 1.6rem;
    }
    .logo {
        font-size: 1.2rem;
    }
    .guide-step {
        padding: 25px 15px;
    }
}

@media (min-width: 769px) {
    /* Desktop-Specific Header Polishing */
    .nav-container {
        justify-content: space-between;
        padding: 0 40px;
    }

    .nav-links {
        display: flex;
        align-items: center;
        gap: 35px;
    }

    .nav-links a {
        position: relative;
        padding: 8px 0;
        font-weight: 600;
        letter-spacing: 0.3px;
    }
    
    .nav-links a::after {
        content: '';
        position: absolute;
        bottom: 2px;
        left: 0;
        width: 0;
        height: 2px;
        background-color: var(--primary);
        transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .nav-links a:hover::after {
        width: 100%;
    }

    #theme-toggle {
        margin-left: 20px;
        padding: 12px;
        border-radius: 12px;
        display: flex;
        align-items: center;
        justify-content: center;
        background-color: var(--card-bg);
        border: 1px solid var(--border-color);
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: var(--shadow);
    }

    #theme-toggle:hover {
        border-color: var(--primary);
        color: var(--primary);
        transform: rotate(15deg) scale(1.1);
        box-shadow: 0 8px 24px rgba(59, 130, 246, 0.15);
    }
}