/* Base Styles & Custom Properties */
:root {
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --success: #10b981;
    --error: #ef4444;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 20px rgba(59, 130, 246, 0.2); }
    50% { box-shadow: 0 0 40px rgba(59, 130, 246, 0.4); }
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.animate-spin {
    animation: spin 1s linear infinite;
}

.animate-slideDown {
    animation: slideDown 0.4s ease-out forwards;
}

.pulse-glow {
    animation: pulse-glow 3s ease-in-out infinite;
}

.gradient-shift {
    background: linear-gradient(270deg, #3b82f6, #8b5cf6, #3b82f6);
    background-size: 200% 200%;
    animation: gradientShift 6s ease infinite;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Navbar */
.navbar {
    background-color: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 50;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.25rem;
}

.brand-icon {
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

/* Hero Section */
.main-container {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.hero {
    padding: 6rem 2rem;
    text-align: center;
    display: flex;
    justify-content: center;
}

.hero-content {
    max-width: 800px;
    width: 100%;
    animation: fadeIn 0.6s ease-out;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.highlight {
    background: linear-gradient(to right, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

/* Downloader Card */
.downloader-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    padding: 2.5rem;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

.download-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 1rem;
    color: var(--text-secondary);
}

#videoUrl {
    width: 100%;
    padding: 1.25rem 6rem 1.25rem 3rem;
    background-color: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

#videoUrl:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

#videoUrl::placeholder {
    color: #475569;
}

.paste-btn {
    position: absolute;
    right: 0.5rem;
    background: transparent;
    border: none;
    color: var(--primary);
    font-weight: 600;
    padding: 0.5rem 1rem;
    cursor: pointer;
    border-radius: 0.5rem;
    transition: background-color 0.2s ease;
}

.paste-btn:hover {
    background-color: rgba(59, 130, 246, 0.1);
}

.submit-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 1.25rem;
    border: none;
    border-radius: 1rem;
    color: white;
    font-size: 1.125rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3);
}

.submit-btn:active {
    transform: translateY(0);
}

/* Status Container */
.status-container {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.loader-circle {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(59, 130, 246, 0.2);
    border-top-color: var(--primary);
    border-radius: 50%;
}

.status-message {
    color: var(--text-secondary);
    font-size: 1rem;
}

.progress-wrapper {
    width: 100%;
    height: 8px;
    background-color: rgba(15, 23, 42, 0.5);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #3b82f6, #8b5cf6);
    width: 0%;
    transition: width 0.3s ease;
}

.result-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
}

.download-file-btn, .secondary-btn {
    width: 100%;
    padding: 1rem;
    border-radius: 0.75rem;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.download-file-btn {
    background-color: var(--success);
    color: white;
}

.download-file-btn:hover {
    background-color: #059669;
    transform: translateY(-1px);
}

.secondary-btn {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.secondary-btn:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

/* Features Section */
.features-section {
    padding: 6rem 2rem;
    background-color: rgba(15, 23, 42, 0.3);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 4rem;
}

.features-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
}

/* Footer */
.footer {
    padding: 3rem 2rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.footer p {
    margin-bottom: 0.5rem;
}

.disclaimer {
    font-size: 0.875rem;
    opacity: 0.7;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .downloader-card {
        padding: 1.5rem;
    }
    
    .nav-links {
        display: none;
    }
}

/* Local File Warning Banner */
.warning-banner {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.15) 0%, rgba(220, 38, 38, 0.15) 100%);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 0.75rem;
    padding: 1rem 1.5rem;
    margin: 0 auto 2rem;
    max-width: 600px;
    display: flex;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(8px);
    animation: fadeIn 0.4s ease-out;
}

.warning-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-primary);
    font-size: 0.95rem;
    line-height: 1.4;
    text-align: left;
}

.warning-icon {
    color: var(--error);
    flex-shrink: 0;
}

.warning-link {
    color: var(--primary);
    text-decoration: underline;
    font-weight: 600;
    transition: color 0.2s ease;
}

.warning-link:hover {
    color: var(--primary-hover);
}

/* Video Preview */
.preview-wrapper {
    width: 100%;
    max-width: 500px;
    margin: 1rem auto;
    border-radius: 1.25rem;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    background-color: #020617;
}

.video-preview {
    width: 100%;
    max-height: 350px;
    display: block;
    object-fit: contain;
}

/* Quality Options */
.quality-options-container {
    width: 100%;
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    align-items: stretch;
}

.options-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-align: left;
}

.formats-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
    width: 100%;
}

.format-btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 1rem 1.25rem;
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.25s ease;
    text-align: left;
}

.format-btn:hover {
    background-color: var(--primary);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.format-btn:active {
    transform: translateY(0);
}

.format-btn-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.format-btn-resolution {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
    font-weight: 400;
}

.format-btn:hover .format-btn-resolution {
    color: rgba(255, 255, 255, 0.8);
}

.format-btn-icon {
    color: var(--primary);
    transition: color 0.25s ease;
}

.format-btn:hover .format-btn-icon {
    color: white;
}

/* Footer Links */
.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

/* Legal Pages Styling */
.legal-section {
    padding: 4rem 2rem;
    display: flex;
    justify-content: center;
    animation: fadeIn 0.5s ease-out;
}

.legal-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    padding: 3rem;
    max-width: 800px;
    width: 100%;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.legal-title {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.legal-updated {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.legal-card h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 2rem 0 1rem;
    color: var(--text-primary);
}

.legal-card p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 1.25rem;
}

.legal-card ul {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

.legal-card li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.legal-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s ease;
}

.legal-link:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* AdSense Placeholders */
.ad-placeholder-header {
    max-width: 800px;
    width: 90%;
    margin: 2rem auto 0;
    padding: 0.5rem;
    text-align: center;
}

.ad-placeholder-inline {
    width: 100%;
    margin: 2rem 0;
    padding: 0.5rem;
    text-align: center;
}

.ad-placeholder-footer {
    max-width: 900px;
    width: 90%;
    margin: 2rem auto;
    padding: 0.5rem;
    text-align: center;
}

.ad-tag {
    display: block;
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--text-secondary);
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
    opacity: 0.8;
}

.ad-box-mock {
    background: rgba(255, 255, 255, 0.02);
    border: 1px dashed var(--border-color);
    border-radius: 0.75rem;
    color: rgba(255, 255, 255, 0.2);
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    letter-spacing: 0.05em;
    transition: all 0.3s ease;
}

.ad-placeholder-header .ad-box-mock {
    height: 90px;
}

.ad-placeholder-inline .ad-box-mock {
    height: 250px;
}

.ad-placeholder-footer .ad-box-mock {
    height: 90px;
}

.ad-box-mock:hover {
    border-color: var(--primary);
    color: rgba(255, 255, 255, 0.4);
    background: rgba(59, 130, 246, 0.02);
}

/* Guide Articles Section */
.guide-section {
    padding: 4rem 2rem;
    background-color: rgba(15, 23, 42, 0.15);
    border-top: 1px solid var(--border-color);
}

.guide-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: left;
}

.guide-section-title {
    font-size: 2.25rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 3rem;
}

.guide-article {
    margin-bottom: 2.5rem;
}

.guide-article h3 {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.guide-article p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 1rem;
}

/* Cookie Consent Banner */
.cookie-consent {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 650px;
    background-color: rgba(30, 41, 59, 0.85);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 1.25rem;
    padding: 1.5rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
    z-index: 100;
    animation: slideDown 0.4s cubic-bezier(0.16, 1, 0.3, 1) reverse;
}

.cookie-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.cookie-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
    text-align: left;
}

.cookie-link {
    color: var(--primary);
    text-decoration: underline;
    font-weight: 600;
}

.cookie-buttons {
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
}

.cookie-btn-primary, .cookie-btn-secondary {
    padding: 0.6rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 0.6rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.cookie-btn-primary {
    background-color: var(--primary);
    color: white;
}

.cookie-btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.cookie-btn-secondary {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.cookie-btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

/* Contact Page Styling */
.contact-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    padding: 3rem;
    max-width: 650px;
    width: 100%;
    margin: 0 auto;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.contact-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 2rem;
    line-height: 1.5;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.form-control {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    text-align: left;
}

.form-control label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-control input, .form-control textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    background-color: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: all 0.3s ease;
    font-family: inherit;
}

.form-control input:focus, .form-control textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.text-center {
    text-align: center !important;
}

@media (max-width: 576px) {
    .form-group-row {
        grid-template-columns: 1fr;
    }
    
    .legal-card, .contact-card {
        padding: 1.5rem;
    }
}

/* Navbar Active State */
.nav-links a.active {
    color: var(--primary);
    font-weight: 700;
    border-bottom: 2px solid var(--primary);
    padding-bottom: 0.25rem;
}