/* ==========================================================================
Y2MP3 - Complete Production Stylesheet
Domain: https://y2-mp3.com
========================================================================== */

/* --------------------------------------------------------------------------

CSS Custom Properties / Design Tokens
-------------------------------------------------------------------------- */
:root {
--bg-primary: #0f172a;
--bg-secondary: #1e293b;
--bg-tertiary: #334155;
--primary-accent: #ff2a2a;
--primary-accent-hover: #d91b1b;
--primary-accent-glow: rgba(255, 42, 42, 0.35);
--text-primary: #ffffff;
--text-secondary: #94a3b8;
--text-muted: #64748b;
--border-color: rgba(255, 255, 255, 0.1);
--border-glow: rgba(255, 42, 42, 0.3);
--radius-sm: 8px;
--radius-md: 12px;
--radius-lg: 16px;
--radius-full: 9999px;
--shadow-main: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
--transition-fast: 0.2s ease;
--transition-normal: 0.3s ease;
}

/* --------------------------------------------------------------------------
2. Global Reset & Typography
-------------------------------------------------------------------------- */
*, *::before, *::after {
box-sizing: border-box;
margin: 0;
padding: 0;
}

html {
font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
background-color: var(--bg-primary);
color: var(--text-primary);
line-height: 1.5;
scroll-behavior: smooth;
-webkit-text-size-adjust: 100%;
}

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

a {
color: inherit;
text-decoration: none;
transition: color var(--transition-fast);
}

button, input {
font-family: inherit;
font-size: inherit;
border: none;
outline: none;
}

button {
cursor: pointer;
}

img {
max-width: 100%;
height: auto;
display: block;
}

/* --------------------------------------------------------------------------
3. Header & Navigation Layout
-------------------------------------------------------------------------- */
.site-header {
width: 100%;
background-color: rgba(15, 23, 42, 0.95);
backdrop-filter: blur(8px);
border-bottom: 1px solid var(--border-color);
position: sticky;
top: 0;
z-index: 100;
}

.header-container {
max-width: 1100px;
margin: 0 auto;
padding: 0.85rem 1.25rem;
display: flex;
align-items: center;
justify-content: space-between;
}

.brand-logo {
display: flex;
align-items: center;
gap: 0.5rem;
font-weight: 800;
font-size: 1.4rem;
letter-spacing: -0.02em;
}

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

.main-navigation {
display: flex;
align-items: center;
gap: 1.5rem;
}

.nav-link {
font-size: 0.95rem;
font-weight: 600;
color: var(--text-secondary);
transition: color var(--transition-fast);
}

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

.mobile-menu-btn {
display: none;
background: transparent;
flex-direction: column;
gap: 5px;
padding: 0.5rem;
z-index: 110;
}

.hamburger-bar {
width: 24px;
height: 2px;
background-color: var(--text-primary);
border-radius: 2px;
transition: transform 0.3s ease, opacity 0.3s ease;
}

/* --------------------------------------------------------------------------
4. Main Container & Form Layout
-------------------------------------------------------------------------- */
.main-container {
max-width: 900px;
margin: 2rem auto;
padding: 0 1.25rem;
flex: 1;
width: 100%;
}

.modern-form {
background-color: var(--bg-secondary);
border: 1px solid var(--border-color);
border-radius: var(--radius-lg);
padding: 1.5rem;
box-shadow: var(--shadow-main);
margin-bottom: 1.5rem;
}

.input-container-group {
display: flex;
gap: 0.75rem;
margin-bottom: 1.25rem;
}

.input-container-group input[type="url"] {
flex: 1;
background-color: var(--bg-primary);
border: 1px solid var(--border-color);
border-radius: var(--radius-md);
padding: 0.85rem 1.25rem;
color: var(--text-primary);
font-size: 1rem;
transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-container-group input[type="url"]:focus {
border-color: var(--primary-accent);
box-shadow: 0 0 0 3px var(--primary-accent-glow);
}

.btn-primary {
background: linear-gradient(135deg, var(--primary-accent) 0%, var(--primary-accent-hover) 100%);
color: var(--text-primary);
font-weight: 700;
padding: 0.85rem 1.75rem;
border-radius: var(--radius-md);
display: flex;
align-items: center;
gap: 0.5rem;
box-shadow: 0 4px 15px var(--primary-accent-glow);
transition: transform var(--transition-fast), opacity var(--transition-fast);
white-space: nowrap;
}

.btn-primary:hover {
opacity: 0.95;
transform: translateY(-1px);
}

.btn-primary:disabled {
opacity: 0.6;
cursor: not-allowed;
transform: none;
}

/* Bitrate Selection Tabs */
.format-tabs {
display: grid;
grid-template-columns: repeat(3, 1fr);
gap: 0.75rem;
}

.tab-btn {
background-color: var(--bg-primary);
border: 1px solid var(--border-color);
border-radius: var(--radius-md);
padding: 0.75rem 0.5rem;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.tab-btn:hover {
border-color: rgba(255, 42, 42, 0.5);
}

.tab-btn.active {
border-color: var(--primary-accent);
background-color: rgba(255, 42, 42, 0.08);
box-shadow: 0 0 12px var(--primary-accent-glow);
}

.tab-title {
font-size: 0.85rem;
font-weight: 700;
color: var(--text-primary);
}

.tab-subtitle {
font-size: 0.75rem;
color: var(--text-secondary);
}

.tab-btn.active .tab-title {
color: var(--primary-accent);
}

/* --------------------------------------------------------------------------
5. Real-Time Progress Bar Component & Pre-allocation Container
-------------------------------------------------------------------------- */
.cls-pre-allocation {
min-height: 80px;
display: flex;
align-items: center;
justify-content: center;
margin-bottom: 1.5rem;
width: 100%;
}

.progress-card {
background-color: var(--bg-secondary);
border: 1px solid var(--border-glow);
border-radius: var(--radius-lg);
padding: 1.5rem;
width: 100%;
box-sizing: border-box;
box-shadow: var(--shadow-main);
}

.progress-header {
display: flex;
align-items: center;
justify-content: space-between;
margin-bottom: 0.85rem;
width: 100%;
}

.progress-title-group {
display: flex;
align-items: center;
gap: 0.6rem;
}

.progress-label {
font-size: 1rem;
font-weight: 750;
color: var(--text-primary);
}

.progress-percentage {
font-size: 1.25rem;
font-weight: 850;
color: var(--primary-accent);
font-variant-numeric: tabular-nums;
}

.progress-percentage.completed {
color: #10b981 !important;
}

.progress-track {
width: 100%;
height: 14px;
background-color: var(--bg-primary);
border: 1px solid var(--border-color);
border-radius: 20px;
overflow: hidden;
position: relative;
}

.progress-fill {
height: 100%;
width: 0%;
background: linear-gradient(90deg, #ff2a2a 0%, #ff5555 100%);
border-radius: 20px;
box-shadow: 0 0 12px var(--primary-accent-glow);
transition: width 0.35s ease-out, background-color 0.3s ease;
}

.progress-fill.completed {
background: linear-gradient(90deg, #10b981 0%, #059669 100%) !important;
box-shadow: 0 0 12px rgba(16, 185, 129, 0.4) !important;
}

.progress-subtext {
font-size: 0.85rem;
color: var(--text-secondary);
margin-top: 0.75rem;
display: flex;
align-items: center;
gap: 0.4rem;
}

.download-action-container {
margin-top: 1.25rem;
width: 100%;
animation: fadeInUp 0.45s ease-out forwards;
}

/* Spinner Animation */
.spinner-small {
width: 16px;
height: 16px;
border: 2px solid rgba(255, 42, 42, 0.3);
border-top-color: var(--primary-accent);
border-radius: 50%;
animation: spin 0.8s linear infinite;
}

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

@keyframes fadeInUp {
from {
opacity: 0;
transform: translateY(12px);
}
to {
opacity: 1;
transform: translateY(0);
}
}

/* --------------------------------------------------------------------------
6. Download Action Card & Audio Stream Previewer
-------------------------------------------------------------------------- */
.preview-card-container {
background-color: var(--bg-secondary);
border: 1px solid var(--border-color);
border-radius: var(--radius-lg);
padding: 1.5rem;
box-shadow: var(--shadow-main);
display: flex;
flex-direction: column;
gap: 1.25rem;
}

.preview-card-header {
display: flex;
align-items: center;
gap: 1.25rem;
}

.thumbnail-wrapper {
position: relative;
width: 120px;
height: 80px;
border-radius: var(--radius-sm);
overflow: hidden;
flex-shrink: 0;
background-color: var(--bg-primary);
}

.preview-thumbnail {
width: 100%;
height: 100%;
object-fit: cover;
}

.quality-badge {
position: absolute;
bottom: 4px;
right: 4px;
background-color: rgba(0, 0, 0, 0.8);
color: var(--primary-accent);
font-size: 0.7rem;
font-weight: 800;
padding: 2px 6px;
border-radius: 4px;
}

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

.preview-title {
font-size: 1.1rem;
font-weight: 800;
color: var(--text-primary);
margin-bottom: 0.25rem;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}

.preview-meta {
font-size: 0.85rem;
color: var(--text-secondary);
}

/* Embedded Audio Player */
.audio-stream-previewer {
background-color: var(--bg-primary);
border: 1px solid var(--border-color);
border-radius: var(--radius-md);
padding: 1rem;
display: flex;
flex-direction: column;
gap: 0.5rem;
}

.previewer-label {
display: flex;
align-items: center;
gap: 0.4rem;
font-size: 0.8rem;
font-weight: 700;
color: var(--text-secondary);
text-transform: uppercase;
letter-spacing: 0.05em;
}

.preview-audio-player {
width: 100%;
height: 40px;
border-radius: var(--radius-sm);
outline: none;
}

.preview-actions {
width: 100%;
}

.download-btn-primary {
display: flex;
align-items: center;
justify-content: center;
gap: 0.6rem;
width: 100%;
padding: 1rem;
background: linear-gradient(135deg, #10b981 0%, #059669 100%);
color: #ffffff;
font-weight: 800;
font-size: 1.05rem;
border-radius: var(--radius-md);
box-shadow: 0 4px 15px rgba(16, 185, 129, 0.35);
transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.download-btn-primary:hover {
opacity: 0.95;
transform: translateY(-1px);
}

/* --------------------------------------------------------------------------
7. Status Boxes & Chrome Extension Promo Banner
-------------------------------------------------------------------------- */
.status-box {
display: flex;
align-items: center;
gap: 0.75rem;
padding: 1rem 1.25rem;
border-radius: var(--radius-md);
font-size: 0.95rem;
font-weight: 600;
margin-bottom: 1.5rem;
}

.status-error {
background-color: rgba(239, 68, 68, 0.1);
border: 1px solid rgba(239, 68, 68, 0.3);
color: #f87171;
}

.extension-promo-card {
background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
border: 1px solid var(--border-color);
border-radius: var(--radius-lg);
padding: 1.25rem 1.5rem;
display: flex;
align-items: center;
justify-content: space-between;
gap: 1.25rem;
margin-bottom: 2.5rem;
box-shadow: var(--shadow-main);
}

.extension-promo-icon {
color: var(--primary-accent);
}

.extension-promo-content h3 {
font-size: 1.1rem;
font-weight: 800;
color: var(--text-primary);
margin-bottom: 0.25rem;
}

.extension-promo-content p {
font-size: 0.85rem;
color: var(--text-secondary);
}

.extension-install-btn {
background-color: #ffffff;
color: #0f172a;
font-weight: 800;
font-size: 0.85rem;
padding: 0.6rem 1.25rem;
border-radius: var(--radius-md);
display: flex;
align-items: center;
gap: 0.4rem;
white-space: nowrap;
transition: opacity var(--transition-fast);
}

.extension-install-btn:hover {
opacity: 0.9;
}

/* --------------------------------------------------------------------------
8. Feature Grid & 3-Step Pipeline
-------------------------------------------------------------------------- */
.benefits-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
gap: 1.25rem;
}

.benefit-card {
background-color: var(--bg-secondary);
border: 1px solid var(--border-color);
border-radius: var(--radius-md);
padding: 1.25rem;
}

.benefit-card h3 {
font-size: 1.05rem;
font-weight: 800;
color: var(--text-primary);
margin-bottom: 0.5rem;
}

.benefit-card p {
font-size: 0.85rem;
color: var(--text-secondary);
line-height: 1.6;
}

.instruction-block {
background-color: var(--bg-secondary);
border: 1px solid var(--border-color);
border-radius: var(--radius-lg);
padding: 2rem 1.5rem;
margin-bottom: 2.5rem;
}

.instruction-title {
font-size: 1.6rem;
font-weight: 850;
color: var(--text-primary);
margin-bottom: 0.5rem;
}

.pipeline-container {
display: flex;
align-items: center;
justify-content: space-between;
gap: 1rem;
}

.pipeline-step {
flex: 1;
background-color: var(--bg-primary);
border: 1px solid var(--border-color);
border-radius: var(--radius-md);
padding: 1.25rem;
text-align: center;
position: relative;
}

.step-badge {
position: absolute;
top: -10px;
left: 50%;
transform: translateX(-50%);
background-color: var(--primary-accent);
color: var(--text-primary);
font-size: 0.7rem;
font-weight: 800;
padding: 2px 10px;
border-radius: var(--radius-full);
}

.step-icon {
color: var(--primary-accent);
margin-bottom: 0.5rem;
}

.step-title {
font-size: 1rem;
font-weight: 800;
margin-bottom: 0.35rem;
}

.step-desc {
font-size: 0.8rem;
color: var(--text-secondary);
line-height: 1.5;
}

.pipeline-arrow {
color: var(--text-muted);
}

.responsive-cta {
background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
border: 1px solid var(--border-glow);
border-radius: var(--radius-lg);
padding: 2.5rem 1.5rem;
text-align: center;
display: flex;
flex-direction: column;
align-items: center;
gap: 1rem;
}

.responsive-cta h2 {
font-size: 1.75rem;
font-weight: 850;
}

.responsive-cta p {
color: var(--text-secondary);
max-width: 600px;
}

/* --------------------------------------------------------------------------
9. Footer Styling
-------------------------------------------------------------------------- */
.site-footer {
width: 100%;
background-color: #0b1120;
border-top: 1px solid var(--border-color);
padding: 2.5rem 1.25rem;
margin-top: auto;
}

.footer-container {
max-width: 1100px;
margin: 0 auto;
display: flex;
flex-direction: column;
align-items: center;
gap: 1.5rem;
text-align: center;
}

.footer-brand a {
display: flex;
align-items: center;
gap: 0.5rem;
font-weight: 800;
font-size: 1.25rem;
}

.footer-links {
display: flex;
flex-wrap: wrap;
align-items: center;
justify-content: center;
gap: 0.85rem;
font-size: 0.85rem;
color: var(--text-secondary);
}

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

.footer-divider {
color: var(--text-muted);
}

.copyright-label {
font-size: 0.8rem;
color: var(--text-muted);
}

/* --------------------------------------------------------------------------
10. Mobile Responsive Media Queries
-------------------------------------------------------------------------- */
@media (max-width: 768px) {
.mobile-menu-btn {
display: flex;
}

.main-navigation {
position: fixed;
top: 60px;
right: -100%;
width: 260px;
height: calc(100vh - 60px);
background-color: var(--bg-secondary);
border-left: 1px solid var(--border-color);
flex-direction: column;
align-items: flex-start;
padding: 2rem 1.5rem;
gap: 1.5rem;
transition: right 0.35s ease;
box-shadow: -10px 0 25px rgba(0, 0, 0, 0.5);
}

.main-navigation.mobile-open {
right: 0;
}

.input-container-group {
flex-direction: column;
}

.btn-primary {
justify-content: center;
width: 100%;
}

.pipeline-container {
flex-direction: column;
gap: 1.5rem;
}

.pipeline-arrow {
transform: rotate(90deg);
}

.extension-promo-card {
flex-direction: column;
text-align: center;
}

.extension-install-btn {
width: 100%;
justify-content: center;
}

.preview-card-header {
flex-direction: column;
text-align: center;
}

.thumbnail-wrapper {
width: 100%;
height: 160px;
}
}