/*
╔══════════════════════════════════════════════════════════════════╗
║                          DropAR v1.1                             ║
║                  Secure P2P File Transfer                        ║
║                                                                  ║
║  © 2026 Abdelrahman Mohamed. All Rights Reserved.               ║
║  Made with ❤️ by Abdelrahman Mohamed                            ║
║                                                                  ║
║  This stylesheet is protected under MIT License.                 ║
║  Attribution required if reused or modified.                     ║
║  https://github.com/abdo402                                      ║
║                                                                  ║
║  ⚠️  DO NOT REMOVE COPYRIGHT NOTICES                            ║
╚══════════════════════════════════════════════════════════════════╝
*/
/* ================================
   CSS VARIABLES & ROOT
   ================================ */
:root {
    /* Colors - Light Theme */
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    --bg: #ffffff;
    --bg-dark: #f9fafb;
    --surface: #ffffff;
    --text: #1f2937;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --border-dark: #d1d5db;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Border radius */
    --radius-sm: 0.25rem;
    --radius: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow: 0 1px 3px 0 rgba(0,0,0,.1), 0 1px 2px 0 rgba(0,0,0,.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1), 0 4px 6px -2px rgba(0,0,0,.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,.1), 0 10px 10px -5px rgba(0,0,0,.04);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Dark Theme - Auto-detect system preference */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --primary: #3b82f6;
        --primary-dark: #2563eb;
        --bg: #111827;
        --bg-dark: #1f2937;
        --surface: #1f2937;
        --text: #f9fafb;
        --text-muted: #9ca3af;
        --border: #374151;
        --border-dark: #4b5563;
    }
}

/* Dark Theme - Manual override */
[data-theme="dark"] {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --bg: #111827;
    --bg-dark: #1f2937;
    --surface: #1f2937;
    --text: #f9fafb;
    --text-muted: #9ca3af;
    --border: #374151;
    --border-dark: #4b5563;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    min-height: 100vh;
    position: relative;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

[dir="rtl"] { direction: rtl; }

/* ================================
   BACKGROUND DECORATION
   ================================ */
.bg-decoration {
    position: fixed;
    top: -50%;
    right: -10%;
    width: 120%;
    height: 120%;
    background:
        radial-gradient(circle at 20% 50%, rgba(59,130,246,.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(147,51,234,.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(16,185,129,.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
    animation: bgFloat 20s ease-in-out infinite;
}

@keyframes bgFloat {
    0%, 100% { transform: translate(0,0) rotate(0deg); }
    33%       { transform: translate(30px,-30px) rotate(5deg); }
    66%       { transform: translate(-20px,20px) rotate(-5deg); }
}

[data-theme="dark"] .bg-decoration {
    background:
        radial-gradient(circle at 20% 50%, rgba(59,130,246,.2) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(147,51,234,.2) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(16,185,129,.15) 0%, transparent 50%);
}

/* ================================
   CONTAINER
   ================================ */
.container {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* ================================
   HEADER
   ================================ */
.header {
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.logo-container {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--surface);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow);
}

.logo-icon { font-size: 2.5rem; color: var(--primary); }
.logo-icon svg { width: 40px; height: 40px; color: var(--primary); }

.logo-text h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle { font-size: .875rem; color: var(--text-muted); margin-top: -.25rem; }

/* ================================
   SETTINGS BAR
   ================================ */
.settings-bar {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.settings-btn {
    width: 44px; height: 44px;
    display: flex; align-items: center; justify-content: center;
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 1.25rem;
}
.settings-btn:hover  { background: var(--bg-dark); border-color: var(--primary); transform: scale(1.05); }
.settings-btn:active { transform: scale(.95); }

/* ================================
   TABS
   ================================ */
.tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    background: rgba(255,255,255,.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: var(--spacing-sm);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 20px rgba(0,0,0,.1), inset 0 1px 0 rgba(255,255,255,.5);
    border: 1px solid rgba(255,255,255,.3);
}

[data-theme="dark"] .tabs {
    background: rgba(31,41,55,.6);
    border: 1px solid rgba(255,255,255,.1);
}

.tab {
    flex: 1;
    display: flex; align-items: center; justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border: none;
    background: transparent;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
}
.tab::before {
    content: '';
    position: absolute; inset: 0;
    border-radius: var(--radius);
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    opacity: 0;
    transition: opacity var(--transition-normal);
}
.tab:hover:not(.active) { background: rgba(37,99,235,.1); color: var(--text); }
.tab.active             { color: white; transform: scale(1.05); }
.tab.active::before     { opacity: 1; }
.tab-icon, .tab-label   { position: relative; z-index: 1; }
.tab-icon               { font-size: 1.25rem; transition: transform var(--transition-normal); }
.tab.active .tab-icon   { transform: scale(1.1); }

/* ================================
   TAB CONTENT
   ================================ */
.tab-content { display: none; animation: fadeIn .3s ease; }
.tab-content.active { display: block; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ================================
   INFO BANNER
   ================================ */
.info-banner {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, rgba(59,130,246,.15) 0%, rgba(147,51,234,.1) 50%, rgba(16,185,129,.1) 100%);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    animation: fadeIn .5s ease;
    position: relative;
    overflow: hidden;
}
.info-banner::before {
    content: '';
    position: absolute; inset: 0;
    border-radius: var(--radius-lg);
    padding: 2px;
    background: linear-gradient(135deg, #3b82f6, #9333ea, #10b981);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
}
[data-theme="dark"] .info-banner {
    background: linear-gradient(135deg, rgba(59,130,246,.2) 0%, rgba(147,51,234,.15) 50%, rgba(16,185,129,.15) 100%);
}
.info-icon { font-size: 2.5rem; flex-shrink: 0; animation: bounce 2s ease infinite; }
@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50%       { transform: translateY(-5px); }
}
.info-text strong { display: block; color: var(--text); font-size: 1.125rem; margin-bottom: var(--spacing-xs); }
.info-text p      { color: var(--text-muted); font-size: .875rem; line-height: 1.5; }

/* ================================
   CARD
   ================================ */
.card {
    background: rgba(255,255,255,.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,.3);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: 0 10px 40px rgba(0,0,0,.08), 0 2px 8px rgba(0,0,0,.04), inset 0 1px 0 rgba(255,255,255,.5);
    margin-bottom: var(--spacing-lg);
    animation: fadeIn .5s ease .2s both;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    position: relative;
    overflow: hidden;
}
.card::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, #3b82f6, #8b5cf6, #10b981);
    opacity: 0;
    transition: opacity var(--transition-normal);
}
.card:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 50px rgba(0,0,0,.12), 0 4px 12px rgba(0,0,0,.06), inset 0 1px 0 rgba(255,255,255,.6);
}
.card:hover::before { opacity: .8; }
[data-theme="dark"] .card {
    background: rgba(31,41,55,.85);
    border: 1px solid rgba(255,255,255,.1);
    box-shadow: 0 10px 40px rgba(0,0,0,.4), 0 2px 8px rgba(0,0,0,.3), inset 0 1px 0 rgba(255,255,255,.05);
}
[data-theme="dark"] .card:hover {
    box-shadow: 0 15px 50px rgba(0,0,0,.5), 0 4px 12px rgba(0,0,0,.4), inset 0 1px 0 rgba(255,255,255,.08);
}

/* ================================
   UPLOAD AREA
   ================================ */
.upload-area {
    position: relative;
    border: 3px dashed transparent;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    background: linear-gradient(var(--bg), var(--bg)) padding-box,
                linear-gradient(135deg, var(--border) 0%, var(--border-dark) 100%) border-box;
    overflow: hidden;
}
.upload-area::before {
    content: '';
    position: absolute; inset: 0;
    border-radius: var(--radius-lg);
    padding: 3px;
    background: linear-gradient(135deg, var(--primary), #9333ea, #10b981);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--transition-normal);
}
.upload-area:hover           { transform: scale(1.02); }
.upload-area:hover::before   { opacity: 1; }
.upload-area.dragover        { transform: scale(1.05); background: linear-gradient(135deg, rgba(37,99,235,.15) 0%, rgba(147,51,234,.1) 100%) padding-box, linear-gradient(135deg, var(--primary), #9333ea, #10b981) border-box; }
.upload-area.dragover::before{ opacity: 1; animation: borderGlow 2s ease infinite; }
@keyframes borderGlow { 0%, 100% { opacity: 1; } 50% { opacity: .7; } }

.upload-icon-large { font-size: 4rem; margin-bottom: var(--spacing-md); animation: pulse 2s ease infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: .8; transform: scale(1.05); } }

.upload-title  { font-size: 1.25rem; font-weight: 600; color: var(--text); margin-bottom: var(--spacing-sm); }
.upload-hint   { color: var(--text-muted); font-size: .875rem; margin-bottom: var(--spacing-md); }
.upload-info   { display: flex; gap: var(--spacing-sm); justify-content: center; flex-wrap: wrap; margin-bottom: var(--spacing-sm); }
.badge         { display: inline-block; padding: var(--spacing-xs) var(--spacing-md); background: var(--primary); color: white; border-radius: var(--radius-full); font-size: .75rem; font-weight: 600; }
.upload-limit  { color: var(--text-muted); font-size: .75rem; }

/* ================================
   SUCCESS SECTION
   ================================ */
.success-section        { display: none; }
.success-section.active { display: block; }

.success-header { text-align: center; margin-bottom: var(--spacing-lg); }
.success-icon   { font-size: 4rem; margin-bottom: var(--spacing-md); animation: bounceIn .6s ease; }
@keyframes bounceIn {
    0%   { transform: scale(0); opacity: 0; }
    50%  { transform: scale(1.1); }
    100% { transform: scale(1); opacity: 1; }
}
.success-header h2 { font-size: 1.5rem; color: var(--text); }

/* ================================
   CODE DISPLAY
   ================================ */
.code-display {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    background-size: 200% 200%;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    box-shadow: 0 10px 40px rgba(102,126,234,.4), 0 0 60px rgba(118,75,162,.3), inset 0 1px 0 rgba(255,255,255,.2);
    animation: gradientShift 6s ease infinite;
    position: relative;
    overflow: hidden;
}
.code-display::before {
    content: '';
    position: absolute;
    inset: -100%;
    background: radial-gradient(circle, rgba(255,255,255,.3) 0%, transparent 70%);
    animation: rotate 8s linear infinite;
}
@keyframes rotate  { from { transform: rotate(0deg); }   to { transform: rotate(360deg); } }

.code-label {
    color: rgba(255,255,255,.95);
    font-size: .875rem; font-weight: 600;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase; letter-spacing: .05em;
    position: relative; z-index: 1;
}
.code-value {
    font-size: 3rem; font-weight: 700;
    font-family: 'Courier New', monospace;
    letter-spacing: .3em;
    color: white;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 10px rgba(0,0,0,.3), 0 0 20px rgba(255,255,255,.5);
    position: relative; z-index: 1;
    animation: codePulse 2s ease infinite;
}
@keyframes codePulse {
    0%, 100% { text-shadow: 0 2px 10px rgba(0,0,0,.3), 0 0 20px rgba(255,255,255,.5); }
    50%       { text-shadow: 0 2px 10px rgba(0,0,0,.3), 0 0 30px rgba(255,255,255,.8); }
}
.code-actions {
    display: flex; gap: var(--spacing-sm); justify-content: center;
}
.code-copy-btn, .code-share-btn {
    flex: 1;
    display: flex; align-items: center; justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(255,255,255,.2);
    border: 2px solid rgba(255,255,255,.3);
    border-radius: var(--radius);
    color: white; font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}
.code-copy-btn:hover, .code-share-btn:hover { background: rgba(255,255,255,.3); transform: translateY(-2px); }
.code-copy-btn:active, .code-share-btn:active { transform: translateY(0); }
.copy-icon, .share-icon { font-size: 1.125rem; }

/* ================================
   QR CODE
   ================================ */
.qr-code-section {
    background: var(--bg);
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}
.qr-code-label { color: var(--text-muted); font-size: .875rem; margin-bottom: var(--spacing-md); font-weight: 600; }
#qrCodeContainer { display: flex; justify-content: center; align-items: center; }
#qrCodeContainer canvas, #qrCodeContainer img {
    max-width: 200px; height: auto;
    padding: var(--spacing-sm); background: white;
    border-radius: var(--radius); box-shadow: var(--shadow);
}

/* ================================
   CONNECTION STATUS
   ================================ */
.connection-status {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-lg);
    background: var(--bg-dark);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border);
}
.status-indicator { display: flex; align-items: center; gap: var(--spacing-md); }
.status-dot       { width: 16px; height: 16px; border-radius: 50%; position: relative; flex-shrink: 0; }
.status-indicator.waiting  .status-dot { background: var(--warning); animation: statusPulse 2s ease-in-out infinite; }
.status-indicator.connected .status-dot{ background: var(--success); }
.status-indicator.sending  .status-dot { background: var(--primary); animation: statusPulse 1s ease-in-out infinite; }
.status-indicator.error    .status-dot { background: var(--error); }
@keyframes statusPulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: .5; transform: scale(1.2); } }
.status-text strong { display: block; color: var(--text); margin-bottom: var(--spacing-xs); }
.status-text p      { color: var(--text-muted); font-size: .875rem; margin: 0; }

.connection-quality {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(16,185,129,.1);
    border: 2px solid rgba(16,185,129,.3);
    border-radius: var(--radius);
    text-align: center;
    font-size: .875rem;
    font-weight: 600;
    color: var(--success);
}

/* ================================
   TRANSFER STATS
   ================================ */
.transfer-stats {
    display: flex;
    gap: var(--spacing-md);
    justify-content: space-around;
    padding: var(--spacing-lg);
    background: var(--bg-dark);
    border-radius: var(--radius-lg);
    margin: var(--spacing-lg) 0;
    border: 2px solid var(--border);
}
.stat-item  { display: flex; flex-direction: column; align-items: center; gap: var(--spacing-xs); }
.stat-label { font-size: .875rem; color: var(--text-muted); font-weight: 600; }
.stat-value { font-size: 1.125rem; color: var(--primary); font-weight: 700; }

/* ================================
   FILE QUEUE
   ================================ */
.file-queue {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-lg);
    background: var(--bg-dark);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border);
}
.queue-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: var(--spacing-md);
    font-weight: 600; color: var(--text);
}
.queue-list  { display: flex; flex-direction: column; gap: var(--spacing-sm); }
.queue-item  {
    display: flex; align-items: center; gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--surface);
    border-radius: var(--radius);
    border: 2px solid var(--border);
    transition: border-color var(--transition-fast);
}
.queue-item.active    { border-color: var(--primary); background: rgba(37,99,235,.1); }
.queue-item.completed { opacity: .6; }
.queue-item-icon      { font-size: 1.25rem; }
.queue-item-name      { flex: 1; font-size: .875rem; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.queue-item-status    { font-size: .75rem; padding: .25rem .5rem; border-radius: var(--radius-full); background: var(--bg-dark); color: var(--text-muted); }
.queue-item-status.sending   { background: var(--primary); color: white; }
.queue-item-status.completed { background: var(--success); color: white; }

/* ================================
   INSTRUCTIONS
   ================================ */
.instructions {
    background: var(--bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}
.instructions h4   { color: var(--text); margin-bottom: var(--spacing-md); font-size: 1rem; }
.instructions ol   { padding-left: var(--spacing-xl); color: var(--text-muted); }
[dir="rtl"] .instructions ol { padding-left: 0; padding-right: var(--spacing-xl); }
.instructions li   { margin-bottom: var(--spacing-sm); line-height: 1.6; }
.instructions strong { color: var(--primary); }

/* ================================
   FILE DETAILS
   ================================ */
.file-details { background: var(--bg); padding: var(--spacing-lg); border-radius: var(--radius-lg); margin-bottom: var(--spacing-lg); }
.file-detail-row  { display: flex; justify-content: space-between; align-items: center; padding: var(--spacing-md) 0; border-bottom: 1px solid var(--border); }
.file-detail-row:last-child { border-bottom: none; }
.file-detail-label { display: flex; align-items: center; gap: var(--spacing-sm); color: var(--text-muted); font-size: .875rem; font-weight: 600; }
.file-type-icon    { font-size: 1.25rem; }
.file-detail-value { color: var(--text); font-weight: 600; text-align: right; word-break: break-all; max-width: 60%; }

/* ================================
   BUTTONS
   ================================ */
.btn {
    width: 100%;
    display: inline-flex; align-items: center; justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none; border-radius: var(--radius);
    font-size: 1rem; font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative; overflow: hidden;
}
.btn::before {
    content: '';
    position: absolute; top: 50%; left: 50%;
    width: 0; height: 0;
    border-radius: 50%;
    background: rgba(255,255,255,.3);
    transform: translate(-50%,-50%);
    transition: width .6s, height .6s;
}
.btn:active::before { width: 300px; height: 300px; }
.btn-icon, .btn span { position: relative; z-index: 1; }

.btn-primary {
    background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #ec4899 100%);
    background-size: 200% 200%;
    color: white;
    box-shadow: 0 4px 15px rgba(59,130,246,.4), 0 2px 8px rgba(139,92,246,.3);
    animation: gradientShift 3s ease infinite;
}
@keyframes gradientShift { 0%, 100% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } }
.btn-primary::after {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,.2) 0%, transparent 100%);
    opacity: 0; transition: opacity var(--transition-normal);
}
.btn-primary:hover:not(:disabled)::after    { opacity: 1; }
.btn-primary:hover:not(:disabled)           { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(59,130,246,.5), 0 3px 12px rgba(139,92,246,.4); }
.btn-primary:active:not(:disabled)          { transform: translateY(0); }
.btn-primary:disabled                       { opacity: .6; cursor: not-allowed; animation: none; }

.btn-secondary { background: var(--bg); color: var(--text); border: 2px solid var(--border-dark); }
.btn-secondary:hover { background: var(--bg-dark); border-color: var(--text-muted); }

.btn-text { background: none; border: none; color: var(--primary); cursor: pointer; font-size: .875rem; font-weight: 600; transition: color var(--transition-fast); }
.btn-text:hover { color: var(--primary-dark); text-decoration: underline; }

/* ================================
   FORM ELEMENTS
   ================================ */
.form-group { margin-bottom: var(--spacing-md); }
label { display: block; font-weight: 600; margin-bottom: var(--spacing-sm); color: var(--text); font-size: .95rem; }

.code-input {
    width: 100%;
    padding: var(--spacing-lg);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 2rem; font-family: 'Courier New', monospace;
    text-align: center; letter-spacing: .5em; font-weight: 700;
    transition: all var(--transition-normal);
    background: var(--surface); color: var(--text);
}
.code-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,.1);
    transform: scale(1.02);
}

/* ================================
   DOWNLOAD CARD / STATUS
   ================================ */
.download-card { animation: fadeIn .5s ease .3s both; }
#downloadStatus { margin-top: var(--spacing-md); }
.status-message {
    padding: var(--spacing-md);
    border-radius: var(--radius);
    margin-top: var(--spacing-md);
    font-size: .875rem; line-height: 1.6;
    animation: slideUp .3s ease;
}
.status-error   { background: #fee2e2; border: 1px solid #fecaca; color: #991b1b; }
.status-success { background: #dcfce7; border: 1px solid #bbf7d0; color: #166534; }
.status-loading { background: var(--bg); border: 1px solid var(--border); color: var(--text-muted); text-align: center; }

[data-theme="dark"] .status-error   { background: rgba(239,68,68,.2); border-color: rgba(239,68,68,.3); color: #fca5a5; }
[data-theme="dark"] .status-success { background: rgba(16,185,129,.2); border-color: rgba(16,185,129,.3); color: #6ee7b7; }

/* ================================
   HOW IT WORKS
   ================================ */
.how-it-works    { animation: fadeIn .5s ease .4s both; }
.how-it-works h3 { color: var(--text); font-size: 1.125rem; margin-bottom: var(--spacing-md); }
.steps           { display: grid; gap: var(--spacing-md); }
.step            { display: flex; gap: var(--spacing-md); align-items: center; }
.step-number     {
    width: 40px; height: 40px;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white; border-radius: 50%; font-weight: 700; font-size: 1.125rem; flex-shrink: 0;
}
.step-text  { color: var(--text-muted); font-size: .875rem; }
.info-note  { margin-top: var(--spacing-md); }
.info-note p{ color: var(--text-muted); font-size: .75rem; }

/* ================================
   FOOTER
   ================================ */
.footer { margin-top: var(--spacing-xl); padding: var(--spacing-xl) 0; border-top: 2px solid var(--border); }
.footer-content  { text-align: center; }
.creator-info    { font-size: .875rem; color: var(--text-muted); margin-bottom: var(--spacing-md); }
.creator-name    {
    background: linear-gradient(135deg, var(--primary), #8b5cf6);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    font-weight: 700;
}
.social-links    { display: flex; gap: var(--spacing-lg); justify-content: center; margin-bottom: var(--spacing-lg); }
.social-icon     {
    display: inline-flex; align-items: center; justify-content: center;
    width: 40px; height: 40px;
    border-radius: var(--radius-full);
    background: var(--surface); border: 2px solid var(--border);
    color: var(--text-muted);
    transition: all var(--transition-normal); text-decoration: none;
}
.social-icon:hover { transform: translateY(-4px); border-color: var(--primary); color: var(--primary); box-shadow: var(--shadow-lg); }
.social-icon svg   { width: 20px; height: 20px; }
.feedback-btn {
    display: inline-flex; align-items: center; gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--surface); border: 2px solid var(--border);
    border-radius: var(--radius-full);
    font-size: .875rem; font-weight: 600; color: var(--text);
    cursor: pointer; transition: all var(--transition-fast);
    margin-bottom: var(--spacing-md);
}
.feedback-btn:hover  { background: var(--bg-dark); border-color: var(--primary); }
.footer-note         { font-size: .75rem; color: var(--text-muted); }
.copyright-notice    {
    font-size: .875rem; color: var(--text); font-weight: 600;
    margin: var(--spacing-sm) 0; text-align: center; padding: var(--spacing-sm);
    background: linear-gradient(135deg, rgba(59,130,246,.1), rgba(147,51,234,.1));
    border-radius: var(--radius);
    border: 1px solid rgba(59,130,246,.2);
}
[data-theme="dark"] .copyright-notice {
    background: linear-gradient(135deg, rgba(59,130,246,.15), rgba(147,51,234,.15));
    border-color: rgba(59,130,246,.3);
}

/* ================================
   MODAL
   ================================ */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,.5); backdrop-filter: blur(4px); display: none; align-items: center; justify-content: center; z-index: 9998; padding: var(--spacing-md); }
.modal-overlay.active { display: flex; animation: fadeIn .2s ease; }
.modal { background: var(--surface); border-radius: var(--radius-lg); padding: var(--spacing-xl); max-width: 500px; width: 100%; box-shadow: var(--shadow-xl); animation: slideUp .3s ease; }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--spacing-lg); }
.modal-header h3 { font-size: 1.25rem; color: var(--text); }
.modal-close { width: 32px; height: 32px; display: flex; align-items: center; justify-content: center; background: var(--bg); border: 2px solid var(--border); border-radius: var(--radius); font-size: 1.5rem; line-height: 1; cursor: pointer; transition: all var(--transition-fast); color: var(--text-muted); }
.modal-close:hover { background: var(--error); border-color: var(--error); color: white; }

.feedback-form input, .feedback-form textarea {
    width: 100%; padding: var(--spacing-md);
    border: 2px solid var(--border); border-radius: var(--radius);
    font-size: 1rem; font-family: inherit;
    background: var(--bg); color: var(--text);
    transition: border-color var(--transition-fast);
}
.feedback-form input:focus, .feedback-form textarea:focus { outline: none; border-color: var(--primary); }
.feedback-form textarea { min-height: 120px; resize: vertical; }
.feedback-type { display: flex; gap: var(--spacing-sm); flex-wrap: wrap; }
.type-btn { padding: var(--spacing-sm) var(--spacing-md); border: 2px solid var(--border); background: var(--bg); border-radius: var(--radius-full); font-size: .875rem; cursor: pointer; transition: all var(--transition-fast); color: var(--text-muted); }
.type-btn:hover  { border-color: var(--primary); color: var(--primary); }
.type-btn.active { background: var(--primary); border-color: var(--primary); color: white; }

/* ================================
   LOADING OVERLAY
   ================================ */
.loading-overlay { position: fixed; inset: 0; background: rgba(0,0,0,.75); backdrop-filter: blur(8px); display: none; align-items: center; justify-content: center; flex-direction: column; gap: var(--spacing-md); z-index: 9999; }
.loading-overlay.active { display: flex; animation: fadeIn .2s ease; }
.loading-container { display: flex; flex-direction: column; align-items: center; gap: var(--spacing-md); background: var(--surface); padding: var(--spacing-xl); border-radius: var(--radius-lg); box-shadow: var(--shadow-xl); min-width: 280px; }
[data-theme="dark"] .loading-container { background: var(--bg-dark); }
.spinner { width: 50px; height: 50px; border: 4px solid rgba(59,130,246,.3); border-top-color: var(--primary); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text  { color: var(--text); font-weight: 600; font-size: 1rem; text-align: center; margin: 0; }
.progress-container { width: 100%; height: 8px; background: var(--border); border-radius: var(--radius-full); overflow: hidden; position: relative; }
.progress-bar  { height: 100%; width: 0%; background: linear-gradient(90deg, var(--primary), #8b5cf6); border-radius: var(--radius-full); transition: width .3s ease; position: relative; overflow: hidden; }
.progress-bar::after { content: ''; position: absolute; inset: 0; background: linear-gradient(90deg, transparent, rgba(255,255,255,.3), transparent); animation: shimmer 1.5s infinite; }
@keyframes shimmer { 0% { transform: translateX(-100%); } 100% { transform: translateX(100%); } }
.progress-text { color: var(--text-muted); font-size: .875rem; font-weight: 600; margin: 0; }

/* ================================
   TOAST
   ================================ */
.toast {
    position: fixed; bottom: var(--spacing-xl); left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--success); color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full); box-shadow: var(--shadow-xl);
    display: flex; align-items: center; gap: var(--spacing-sm);
    font-weight: 600; z-index: 10000; opacity: 0;
    transition: all var(--transition-normal);
}
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }
.toast-icon { font-size: 1.25rem; }

/* ================================
   NETWORK WARNING
   ================================ */
.network-warning {
    display: flex; gap: var(--spacing-md); padding: var(--spacing-lg);
    background: linear-gradient(135deg, rgba(245,158,11,.15) 0%, rgba(239,68,68,.1) 100%);
    border: 2px solid var(--warning); border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg); animation: slideDown .3s ease;
}
@keyframes slideDown { from { opacity: 0; transform: translateY(-20px); } to { opacity: 1; transform: translateY(0); } }
.warning-icon          { font-size: 2rem; flex-shrink: 0; }
.warning-text strong   { display: block; color: var(--warning); margin-bottom: var(--spacing-xs); }
.warning-text p        { color: var(--text-muted); font-size: .875rem; margin: 0; }

/* ================================
   VERSION BADGE
   ================================ */
.version-badge {
    display: inline-block; padding: .25rem .75rem;
    background: linear-gradient(135deg, var(--primary), #8b5cf6);
    color: white; font-size: .75rem; font-weight: 700;
    border-radius: var(--radius-full); margin-top: var(--spacing-sm);
    box-shadow: var(--shadow);
}

/* ================================
   CODE EXPIRATION TIMER
   ================================ */
.code-expiration {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(239,68,68,.1);
    border: 2px solid rgba(239,68,68,.3);
    border-radius: var(--radius);
    text-align: center; font-size: .875rem; color: var(--text-muted);
    position: relative; z-index: 1;
}
.timer-value          { font-weight: 700; font-size: 1rem; color: var(--error); margin-left: var(--spacing-xs); }
.timer-value.warning  { animation: timerPulse 1s ease infinite; }
@keyframes timerPulse { 0%, 100% { opacity: 1; } 50% { opacity: .5; } }

/* ================================
   FILE PREVIEW
   ================================ */
#filePreviewSection {
    margin-top: var(--spacing-lg); padding: var(--spacing-lg);
    background: var(--bg-dark); border-radius: var(--radius-lg);
    border: 2px solid var(--border);
}
.preview-header           { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--spacing-md); }
.preview-header h4        { margin: 0; color: var(--text); }
#filePreviewList          { display: flex; flex-direction: column; gap: var(--spacing-sm); margin-bottom: var(--spacing-lg); }
.file-preview-item        { display: flex; align-items: center; gap: var(--spacing-md); padding: var(--spacing-md); background: var(--surface); border: 2px solid var(--border); border-radius: var(--radius); position: relative; }
.file-preview-thumbnail   { width: 60px; height: 60px; border-radius: var(--radius); object-fit: cover; flex-shrink: 0; }
.file-preview-icon        { width: 60px; height: 60px; display: flex; align-items: center; justify-content: center; background: var(--bg-dark); border-radius: var(--radius); font-size: 2rem; flex-shrink: 0; }
.file-preview-info        { flex: 1; min-width: 0; }
.file-preview-name        { font-weight: 600; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file-preview-size        { font-size: .875rem; color: var(--text-muted); margin-top: var(--spacing-xs); }
.file-preview-remove      { width: 32px; height: 32px; display: flex; align-items: center; justify-content: center; background: var(--error); color: white; border: none; border-radius: var(--radius); cursor: pointer; font-size: 1.25rem; line-height: 1; transition: all var(--transition-fast); flex-shrink: 0; }
.file-preview-remove:hover{ transform: scale(1.1); }

/* ================================
   HISTORY
   ================================ */
.history-list      { max-height: 400px; overflow-y: auto; margin-bottom: var(--spacing-lg); }
.empty-history     { text-align: center; padding: var(--spacing-xl); color: var(--text-muted); }
.history-item      { padding: var(--spacing-md); background: var(--bg-dark); border-radius: var(--radius); margin-bottom: var(--spacing-sm); border: 2px solid var(--border); transition: all var(--transition-fast); }
.history-item:hover{ border-color: var(--primary); transform: translateX(5px); }
[dir="rtl"] .history-item:hover { transform: translateX(-5px); }
.history-item-header  { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--spacing-xs); }
.history-item-name    { font-weight: 600; color: var(--text); display: flex; align-items: center; gap: var(--spacing-xs); }
.history-item-time    { font-size: .75rem; color: var(--text-muted); }
.history-item-details { font-size: .875rem; color: var(--text-muted); display: flex; gap: var(--spacing-md); }

/* ================================
   RESPONSIVE
   ================================ */
@media (max-width: 768px) {
    :root { --spacing-xl: 1.5rem; --spacing-lg: 1.25rem; }
    .logo-icon { font-size: 2rem; }
    .logo-text h1 { font-size: 1.5rem; }
    .code-value { font-size: 2.5rem; }
}

@media (max-width: 480px) {
    :root { --spacing-xl: 1rem; --spacing-lg: 1rem; }
    .container  { padding: var(--spacing-sm); }
    .header     { padding: var(--spacing-lg) 0; }
    .logo-container { padding: var(--spacing-sm) var(--spacing-md); }
    .logo-icon  { font-size: 1.5rem; }
    .logo-text h1 { font-size: 1.25rem; }
    .subtitle   { font-size: .75rem; }
    .tab        { padding: var(--spacing-sm); font-size: .875rem; }
    .tab-label  { display: none; }
    .tab-icon   { font-size: 1.5rem; }
    .upload-icon-large { font-size: 3rem; }
    .upload-title { font-size: 1.125rem; }
    .code-value { font-size: 2rem; letter-spacing: .2em; }
    .code-actions { flex-direction: column; }
    .modal      { width: 95%; padding: var(--spacing-lg); }
    .transfer-stats { flex-direction: column; align-items: stretch; }
    .stat-item  { flex-direction: row; justify-content: space-between; padding: var(--spacing-sm) 0; border-bottom: 1px solid var(--border); }
    .stat-item:last-child { border-bottom: none; }
    .file-preview-item { flex-direction: column; text-align: center; }
    .file-preview-thumbnail, .file-preview-icon { width: 80px; height: 80px; }
}

@media (max-width: 360px) {
    .logo-text h1  { font-size: 1.125rem; }
    .code-value    { font-size: 1.75rem; }
    .upload-info   { flex-direction: column; }
    .badge         { width: 100%; text-align: center; }
}

@media (max-height: 600px) and (orientation: landscape) {
    .header { padding: var(--spacing-sm) 0; }
    .logo-container { padding: var(--spacing-xs) var(--spacing-md); }
    .logo-icon { font-size: 1.5rem; }
    .upload-icon-large { font-size: 2.5rem; }
    .success-icon { font-size: 2.5rem; }
}

/* ================================
   ACCESSIBILITY
   ================================ */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .01ms !important;
    }
}
*:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0; }