/* ==================== ROOT VARIABLES ==================== */
:root {
    /* Colors */
    --bg-primary: #0a0e27;
    --bg-secondary: #111633;
    --bg-card: rgba(17, 22, 51, 0.8);
    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --accent-primary: #00d9ff;
    --accent-secondary: #7000ff;
    --success: #00ff88;
    --warning: #ffba08;
    --danger: #ff4d6d;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Transitions */
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px rgba(0, 217, 255, 0.3);
}

/* ==================== RESET & BASE ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
    transition: var(--transition);
}

input, textarea, select {
    font-family: inherit;
    outline: none;
    transition: var(--transition);
}

.hidden {
    display: none !important;
}

.container {
    max-width: 1400px;
    margin: 15rem auto;
    padding: 0 2rem;
}

/* ==================== NAVIGATION ==================== */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 217, 255, 0.1);
}

nav {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
}

.logo a {
    color: var(--text-primary);
}

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

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--accent-primary);
    background: rgba(0, 217, 255, 0.1);
}

main {
    margin-top: 80px;
}

/* ==================== BUTTONS ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    box-shadow: 0 4px 15px rgba(0, 217, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 217, 255, 0.4);
}

.btn-secondary {
    background: rgba(0, 217, 255, 0.1);
    color: var(--accent-primary);
    border: 2px solid var(--accent-primary);
}

.btn-secondary:hover {
    background: rgba(0, 217, 255, 0.2);
}

.btn-danger {
    background: rgba(255, 77, 109, 0.2);
    color: var(--danger);
    border: 2px solid var(--danger);
}

.btn-danger:hover {
    background: var(--danger);
    color: white;
}

.btn-hero {
    padding: 1.25rem 2.5rem;
    font-size: 1.125rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    box-shadow: 0 10px 40px rgba(0, 217, 255, 0.4);
}

.btn-hero:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 50px rgba(0, 217, 255, 0.5);
}

.btn-cta {
    padding: 1.25rem 2.5rem;
    font-size: 1.125rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    box-shadow: 0 10px 40px rgba(0, 217, 255, 0.4);
}

.btn-cta:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 50px rgba(0, 217, 255, 0.5);
}

.btn-copy {
    padding: 0.875rem 1.5rem;
    background: var(--accent-primary);
    color: white;
    white-space: nowrap;
}

.btn-copy:hover {
    background: var(--accent-secondary);
    transform: scale(1.05);
}

/* ==================== HERO SECTION ==================== */
.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 2rem;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.3;
}

.gradient-1 {
    top: 10%;
    left: 10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-primary), transparent);
}

.gradient-2 {
    bottom: 10%;
    right: 10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--accent-secondary), transparent);
}

.gradient-3 {
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(0, 217, 255, 0.2), transparent);
}

.grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(0, 217, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 217, 255, 0.05) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    max-width: 900px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.5rem;
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid rgba(0, 217, 255, 0.3);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: 2rem;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-primary);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-bottom: 3rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.stat-divider {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, transparent, rgba(0, 217, 255, 0.3), transparent);
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Floating Cards Animation */
.floating-cards {
    position: absolute;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.float-card {
    position: absolute;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 217, 255, 0.2);
    border-radius: 16px;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    animation: float 6s ease-in-out infinite;
}

.card-1 {
    top: 20%;
    right: 5%;
    animation-delay: 0s;
}

.card-2 {
    bottom: 30%;
    left: 5%;
    animation-delay: 2s;
}

.card-3 {
    top: 60%;
    right: 10%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.card-icon {
    font-size: 2rem;
}

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

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

/* Network Visualization */
.network-visualization {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 40%;
    height: 40%;
    opacity: 0.1;
    pointer-events: none;
}

.network-svg {
    width: 100%;
    height: 100%;
}

.node {
    fill: var(--accent-primary);
    animation: pulse 3s ease-in-out infinite;
}

.node-center {
    fill: var(--accent-secondary);
}

.connection {
    stroke: var(--accent-primary);
    stroke-width: 2;
    stroke-dasharray: 5;
    animation: dash 2s linear infinite;
}

@keyframes dash {
    to { stroke-dashoffset: -10; }
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.1); }
}

/* ==================== SESSION INTERFACE ==================== */
.session-screen {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.session-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 217, 255, 0.2);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
}

.session-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.session-card h3 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.session-card p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Session Header */
.session-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding: 1.5rem 2rem;
    background: linear-gradient(135deg, rgba(0, 217, 255, 0.1), rgba(112, 0, 255, 0.1));
    border: 1px solid rgba(0, 217, 255, 0.3);
    border-radius: 16px;
    backdrop-filter: blur(20px);
}

.session-header-left {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.session-header-right {
    display: flex;
    gap: 1rem;
}

.session-status-badge {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem;
    background: rgba(0, 255, 136, 0.15);
    border: 2px solid var(--success);
    border-radius: 50px;
    font-weight: 700;
    font-size: 1rem;
    color: var(--success);
}

.status-pulse {
    width: 12px;
    height: 12px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

.peer-counter {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50px;
    font-weight: 600;
    color: var(--text-secondary);
}

/* Session Content Grid */
.session-content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 12px;
    color: white;
}

.card-header h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

/* QR Code Section */
.qr-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 2rem 0;
}

.qr-wrapper {
    padding: 1.5rem;
    background: white;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 217, 255, 0.2);
}

.qr-code img {
    display: block;
    width: 200px;
    height: 200px;
}

.qr-instruction {
    margin-top: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Link Share Section */
.link-share-section {
    margin: 2rem 0;
    text-align: left;
}

.link-share-section label {
    display: block;
    margin-bottom: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
}

.input-group {
    display: flex;
    gap: 0.5rem;
}

.session-url-input {
    flex: 1;
    padding: 1rem;
    background: rgba(10, 14, 39, 0.8);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: var(--accent-primary);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

.session-url-input:focus {
    border-color: var(--accent-primary);
}

/* Share Tips */
.share-tips {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 2rem;
    padding: 1.5rem;
    background: rgba(255, 186, 8, 0.1);
    border-left: 3px solid var(--warning);
    border-radius: 8px;
    text-align: left;
}

.tip-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.tip-icon {
    font-size: 1.2rem;
    flex-shrink: 0;
}

/* Connection Status Display */
.connection-status-display {
    margin: 2rem 0;
}

.connection-indicator {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 2rem;
    background: rgba(0, 217, 255, 0.05);
    border: 1px solid rgba(0, 217, 255, 0.2);
    border-radius: 16px;
}

.connection-icon {
    position: relative;
    width: 60px;
    height: 60px;
    flex-shrink: 0;
}

.connection-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 3px solid var(--warning);
    border-radius: 50%;
    animation: ringPulse 2s ease-in-out infinite;
}

@keyframes ringPulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.5; }
}

.connection-dot {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 30px;
    height: 30px;
    background: var(--warning);
    border-radius: 50%;
}

.connection-info {
    flex: 1;
}

.status-message {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--warning);
    margin-bottom: 0.5rem;
    transition: var(--transition);
}

.status-message.connected {
    color: var(--success);
}

.status-message.connecting {
    color: var(--warning);
}

.status-message.error {
    color: var(--danger);
}

.peer-details {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.separator {
    color: rgba(255, 255, 255, 0.3);
}

/* Connection Stats */
.connection-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 2rem;
}

.stat-item {
    text-align: center;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    transition: var(--transition);
}

.stat-item:hover {
    background: rgba(0, 217, 255, 0.05);
    border-color: var(--accent-primary);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    animation: statPop 0.3s ease;
}

@keyframes statPop {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

/* ==================== CONNECTED STATE LAYOUT ==================== */
.connected-layout {
    max-width: 1600px;
    margin: 0 auto;
}

.main-transfer-layout {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 2rem;
    margin-top: 2rem;
}

/* Main Content Area */
.transfer-main-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Large File Upload Zone */
.file-upload-section-large {
    width: 100%;
}

.upload-zone-large {
    border: 3px dashed rgba(0, 217, 255, 0.4);
    border-radius: 24px;
    padding: 4rem 2rem;
    text-align: center;
    background: linear-gradient(135deg, rgba(0, 217, 255, 0.05), rgba(112, 0, 255, 0.05));
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.upload-zone-large::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 217, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.upload-zone-large:hover::before {
    left: 100%;
}

.upload-zone-large:hover {
    border-color: var(--accent-primary);
    background: linear-gradient(135deg, rgba(0, 217, 255, 0.1), rgba(112, 0, 255, 0.1));
    transform: translateY(-2px);
}

.upload-zone-large.drag-over {
    border-color: var(--accent-primary);
    background: linear-gradient(135deg, rgba(0, 217, 255, 0.15), rgba(112, 0, 255, 0.15));
    transform: scale(1.02);
}

.upload-icon-large {
    color: var(--accent-primary);
    margin-bottom: 1.5rem;
    animation: floatUpDown 3s ease-in-out infinite;
}

@keyframes floatUpDown {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.upload-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.upload-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.upload-subtext {
    font-size: 0.9rem;
    color: var(--text-secondary);
    opacity: 0.7;
}

/* File Queue & History Sections */
.file-queue-section,
.transfer-history-section {
    background: var(--bg-card);
    border: 1px solid rgba(0, 217, 255, 0.2);
    border-radius: 16px;
    padding: 1.5rem;
}

.section-header-inline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.section-header-inline h4 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.queue-badge {
    background: var(--accent-primary);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 700;
}

.file-list,
.history-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-height: 400px;
    overflow-y: auto;
}

.file-list-empty,
.history-list-empty {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
    opacity: 0.5;
}

/* File Item */
.file-item {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    transition: var(--transition);
}

.file-item:hover {
    background: rgba(0, 217, 255, 0.05);
    border-color: var(--accent-primary);
}

.file-info {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.file-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

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

.file-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    word-break: break-word;
    overflow-wrap: break-word;
    line-height: 1.4;
}

.file-size {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.file-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    width: 100%;
}

.file-status {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.btn-cancel {
    padding: 0.5rem;
    background: rgba(255, 77, 109, 0.2);
    border: 1px solid var(--danger);
    border-radius: 8px;
    color: var(--danger);
    transition: var(--transition);
}

.btn-cancel:hover {
    background: var(--danger);
    color: white;
}

/* File Progress */
.file-progress {
    width: 100%;
    margin-top: 0.75rem;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 50px;
    transition: width 0.3s ease;
}

.progress-info {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 1rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.progress-percent {
    font-weight: 700;
    color: var(--accent-primary);
}

.progress-speed {
    text-align: center;
    font-weight: 600;
    color: var(--success);
}

.progress-transferred {
    text-align: right;
}

/* ==================== SIDEBAR ==================== */
.transfer-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: sticky;
    top: 100px;
    height: fit-content;
}

.sidebar-card {
    background: var(--bg-card);
    border: 1px solid rgba(0, 217, 255, 0.2);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition);
}

.sidebar-card:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 10px 30px rgba(0, 217, 255, 0.2);
}

.sidebar-card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.25rem;
    background: rgba(0, 217, 255, 0.05);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-card-header svg {
    color: var(--accent-primary);
    flex-shrink: 0;
}

.sidebar-card-header h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.sidebar-card-content {
    padding: 1.25rem;
}

/* Connection Status in Sidebar */
.connection-status-compact {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(0, 255, 136, 0.08);
    border: 1px solid rgba(0, 255, 136, 0.2);
    border-radius: 12px;
    margin-bottom: 1rem;
}

.status-indicator-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
    animation: pulse 2s ease-in-out infinite;
}

.status-indicator-dot.connected {
    background: var(--success);
    box-shadow: 0 0 10px var(--success);
}

.status-indicator-dot.connecting {
    background: var(--warning);
    box-shadow: 0 0 10px var(--warning);
}

.status-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.25rem;
}

.status-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.peer-count-display {
    padding: 1rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
}

/* Stats Grid in Sidebar */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.stat-mini {
    padding: 1rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    text-align: center;
}

.stat-mini .stat-value {
    font-size: 1.5rem;
    color: var(--accent-primary);
}

/* QR Code Mini */
.qr-code-mini {
    display: flex;
    justify-content: center;
    margin-bottom: 1rem;
}

.qr-mini {
    padding: 0.75rem;
    background: white;
    border-radius: 12px;
    display: inline-block;
}

.qr-mini img {
    display: block;
    width: 120px;
    height: 120px;
}

/* Show QR Button */
.btn-show-qr {
    width: 100%;
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border: none;
    border-radius: 12px;
    color: white;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 1rem;
}

.btn-show-qr:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 217, 255, 0.4);
}

/* Link Share Compact */
.link-share-compact {
    display: flex;
    gap: 0.5rem;
}

.session-link-mini {
    flex: 1;
    padding: 0.75rem;
    background: rgba(10, 14, 39, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: var(--accent-primary);
    font-family: 'Courier New', monospace;
    font-size: 0.75rem;
    overflow: hidden;
    text-overflow: ellipsis;
}

.btn-icon-mini {
    width: 40px;
    height: 40px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-primary);
    border: none;
    border-radius: 8px;
    color: white;
    cursor: pointer;
    transition: var(--transition);
}

.btn-icon-mini:hover {
    background: var(--accent-secondary);
    transform: scale(1.05);
}

.share-note {
    margin-top: 1rem;
    padding: 0.75rem;
    background: rgba(255, 186, 8, 0.1);
    border-left: 3px solid var(--warning);
    border-radius: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ==================== QR MODAL ==================== */
.qr-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.qr-modal.hidden {
    display: none;
}

.qr-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
}

.qr-modal-content {
    position: relative;
    background: var(--bg-card);
    border: 2px solid rgba(0, 217, 255, 0.3);
    border-radius: 24px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 30px 90px rgba(0, 217, 255, 0.3);
    animation: slideUp 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.qr-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.qr-modal-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.btn-close-modal {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 77, 109, 0.2);
    border: 1px solid var(--danger);
    border-radius: 50%;
    color: var(--danger);
    cursor: pointer;
    transition: var(--transition);
}

.btn-close-modal:hover {
    background: var(--danger);
    color: white;
    transform: rotate(90deg);
}

.qr-modal-body {
    padding: 2rem;
}

.qr-display-large {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
}

.qr-display-large > div {
    padding: 2rem;
    background: white;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 217, 255, 0.3);
}

.qr-display-large img {
    display: block;
    width: 250px;
    height: 250px;
}

.qr-scan-instruction {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 2rem;
}

.modal-link-section {
    margin-top: 2rem;
}

.modal-link-section label {
    display: block;
    margin-bottom: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-input-group {
    display: flex;
    gap: 0.75rem;
}

.modal-url-input {
    flex: 1;
    padding: 1rem;
    background: rgba(10, 14, 39, 0.8);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: var(--accent-primary);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

.modal-url-input:focus {
    border-color: var(--accent-primary);
}

/* ==================== FEATURES SHOWCASE ==================== */
.features-showcase {
    padding: 6rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

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

.feature-box {
    padding: 2rem;
    background: var(--bg-card);
    border: 1px solid rgba(0, 217, 255, 0.2);
    border-radius: 20px;
    text-align: center;
    transition: var(--transition);
}

.feature-box:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: 0 20px 60px rgba(0, 217, 255, 0.3);
}

.feature-icon-wrapper {
    margin-bottom: 1.5rem;
}

.feature-icon {
    font-size: 3rem;
    display: inline-block;
    animation: float 3s ease-in-out infinite;
}

.feature-box h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-box p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ==================== HOW IT WORKS ==================== */
.how-it-works {
    padding: 6rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

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

.step-card {
    flex: 1;
    min-width: 200px;
    padding: 2rem;
    background: var(--bg-card);
    border: 1px solid rgba(0, 217, 255, 0.2);
    border-radius: 20px;
    text-align: center;
    transition: var(--transition);
}

.step-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: 0 20px 60px rgba(0, 217, 255, 0.3);
}

.step-number {
    width: 60px;
    height: 60px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 50%;
    color: white;
}

.step-content h4 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.step-arrow {
    font-size: 2rem;
    color: var(--accent-primary);
    flex-shrink: 0;
}

/* ==================== CTA SECTION ==================== */
.cta-section {
    padding: 6rem 2rem;
    margin: 4rem auto;
    max-width: 1200px;
    position: relative;
}

.cta-container {
    position: relative;
    padding: 4rem;
    background: var(--bg-card);
    border: 2px solid rgba(0, 217, 255, 0.3);
    border-radius: 30px;
    overflow: hidden;
}

.cta-content {
    position: relative;
    z-index: 10;
    text-align: center;
}

.cta-title {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cta-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.cta-features {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.cta-feature {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
}

.cta-icon {
    font-size: 1.5rem;
}

.cta-note {
    margin-top: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.cta-bg-decoration {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
}

.cta-circle {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.2;
}

.circle-1 {
    top: -50px;
    left: -50px;
    width: 300px;
    height: 300px;
    background: var(--accent-primary);
}

.circle-2 {
    bottom: -50px;
    right: -50px;
    width: 400px;
    height: 400px;
    background: var(--accent-secondary);
}

.circle-3 {
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 500px;
    height: 500px;
    background: rgba(0, 217, 255, 0.3);
}

/* ==================== FOOTER ==================== */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid rgba(0, 217, 255, 0.1);
    padding: 3rem 2rem 1.5rem;
    margin-top: 6rem;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--accent-primary);
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section ul li a {
    color: var(--text-secondary);
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--accent-primary);
    padding-left: 5px;
}

.footer-bottom {
    max-width: 1400px;
    margin: 0 auto;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ==================== UTILITY CLASSES ==================== */
.page-hidden-warning {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%);
    padding: 1rem 2rem;
    background: var(--warning);
    color: var(--bg-primary);
    border-radius: 8px;
    font-weight: 600;
    z-index: 9999;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        transform: translate(-50%, -100%);
        opacity: 0;
    }
    to {
        transform: translate(-50%, 0);
        opacity: 1;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 217, 255, 0.3);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 217, 255, 0.5);
}

/* ==================== RESPONSIVE DESIGN ==================== */

/* Large Desktops */
@media (max-width: 1400px) {
    .hero-content {
        max-width: 800px;
    }
}

/* Desktop */
@media (max-width: 1200px) {
    .main-transfer-layout {
        grid-template-columns: 1fr 300px;
    }
    
    .hero-title {
        font-size: 3.5rem;
    }
}

/* Tablets */
@media (max-width: 968px) {
    nav {
        padding: 1rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .nav-links a {
        padding: 0.5rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .hero-stats {
        gap: 1.5rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .main-transfer-layout {
        grid-template-columns: 1fr;
    }
    
    .transfer-sidebar {
        position: relative;
        top: 0;
    }
    
    .upload-zone-large {
        padding: 3rem 1.5rem;
    }
    
    .session-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .session-header-left,
    .session-header-right {
        width: 100%;
        justify-content: center;
    }
    
    .session-header-right {
        flex-wrap: wrap;
    }
    
    .session-content-grid {
        grid-template-columns: 1fr;
    }
    
    .connection-stats {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
    
    .steps-container {
        flex-direction: column;
    }
    
    .step-arrow {
        transform: rotate(90deg);
    }
    
    .cta-title {
        font-size: 2rem;
    }
    
    .cta-features {
        flex-direction: column;
        gap: 1rem;
    }
}

/* Mobile Devices */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    main {
        margin-top: 70px;
    }
    
    .nav-links {
        display: none;
    }
    
    .logo {
        font-size: 1.25rem;
    }
    
    .hero-section {
        padding: 1rem;
        min-height: 80vh;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 0.95rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .stat-divider {
        display: none;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn-hero {
        width: 100%;
        justify-content: center;
    }
    
    .floating-cards {
        display: none;
    }
    
    .network-visualization {
        width: 60%;
        height: 30%;
    }
    
    .session-screen {
        padding: 1rem;
    }
    
    .session-header {
        padding: 1rem;
    }
    
    .session-header-left {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .session-status-badge {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }
    
    .peer-counter {
        padding: 0.5rem 1rem;
    }
    
    .session-header-right {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .qr-display-large img {
        width: 200px;
        height: 200px;
    }
    
    .modal-input-group {
        flex-direction: column;
    }
    
    .upload-zone-large {
        padding: 2rem 1rem;
    }
    
    .upload-title {
        font-size: 1.5rem;
    }
    
    .upload-text {
        font-size: 1rem;
    }
    
    .file-list,
    .history-list {
        max-height: 300px;
    }
    
    .features-showcase,
    .how-it-works,
    .cta-section {
        padding: 3rem 1rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-container {
        padding: 2rem 1.5rem;
    }
    
    .cta-title {
        font-size: 1.75rem;
    }
    
    .cta-description {
        font-size: 1rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

/* Small Mobile Devices */
@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-description {
        font-size: 0.875rem;
    }
    
    .stat-number {
        font-size: 1.75rem;
    }
    
    .btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.875rem;
    }
    
    .session-content-grid {
        gap: 1rem;
    }
    
    .session-card {
        padding: 1.5rem;
    }
    
    .qr-wrapper {
        padding: 1rem;
    }
    
    .qr-code img {
        width: 150px;
        height: 150px;
    }
    
    .upload-icon-large svg {
        width: 60px;
        height: 60px;
    }
    
    .upload-title {
        font-size: 1.25rem;
    }
    
    .feature-box,
    .step-card {
        padding: 1.5rem;
    }
    
    .cta-title {
        font-size: 1.5rem;
    }
}

/* Print Styles */
@media print {
    header,
    footer,
    .btn,
    .hero-background,
    .floating-cards,
    .network-visualization,
    .cta-bg-decoration {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .hero-section {
        min-height: auto;
    }
}

/* Accessibility - Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Dark Mode Support (Optional Enhancement) */
@media (prefers-color-scheme: light) {
    /* If you want to add light mode support in future */
}

/* Download button for files */
.btn-download {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, var(--success), #00cc70);
    border: 1px solid var(--success);
    border-radius: 8px;
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
}

.btn-download:hover:not(:disabled) {
    background: linear-gradient(135deg, #00cc70, var(--success));
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 255, 136, 0.3);
}

.btn-download:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.btn-download svg {
    flex-shrink: 0;
}

/* Small download button for history */
.btn-download-small {
    width: 32px;
    height: 32px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--success);
    border: 1px solid var(--success);
    border-radius: 8px;
    color: white;
    cursor: pointer;
    transition: var(--transition);
    margin-left: 1rem;
}

.btn-download-small:hover {
    background: #00cc70;
    transform: scale(1.1);
}

.file-timestamp {
    display: flex;
    align-items: center;
}