/* ==========================================
   FlashShare - Premium Glassmorphism Design
   ========================================== */

/* CSS Custom Properties */
:root {
    /* Colors - Vibrant Gradient Theme */
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --secondary: #ec4899;
    --accent: #06b6d4;
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-success: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    --gradient-dark: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);

    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.12);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --glass-blur: blur(20px);

    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.5);
}

/* Reset & Base */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #0a0a0f;
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* Animated Background */
.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(99, 102, 241, 0.3) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(236, 72, 153, 0.2) 0%, transparent 50%),
        radial-gradient(ellipse at 40% 60%, rgba(6, 182, 212, 0.15) 0%, transparent 40%),
        linear-gradient(180deg, #0a0a0f 0%, #1a1a2e 100%);
    animation: gradientShift 15s ease-in-out infinite alternate;
    z-index: -2;
}

@keyframes gradientShift {
    0% {
        opacity: 1;
    }

    50% {
        opacity: 0.8;
    }

    100% {
        opacity: 1;
    }
}

.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    z-index: -1;
}

/* App Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

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

.logo {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-icon {
    font-size: 2.5rem;
    -webkit-text-fill-color: initial;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}

.tagline {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-top: var(--spacing-sm);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* Steps */
.step {
    display: none;
    width: 100%;
    max-width: 700px;
    animation: fadeIn 0.4s ease-out;
}

.step.active {
    display: block;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Drop Zone */
.drop-zone {
    position: relative;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 2px dashed var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    overflow: hidden;
}

.drop-zone:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
    box-shadow: var(--shadow-glow);
}

.drop-zone.dragover {
    border-color: var(--accent);
    background: rgba(6, 182, 212, 0.15);
    transform: scale(1.02);
}

.drop-zone-content {
    position: relative;
    z-index: 1;
}

.drop-icon {
    color: var(--primary-light);
    margin-bottom: var(--spacing-lg);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.drop-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

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

.drop-zone-hover {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(6, 182, 212, 0.2);
    backdrop-filter: blur(5px);
    opacity: 0;
    transition: opacity var(--transition-fast);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent);
}

.drop-zone.dragover .drop-zone-hover {
    opacity: 1;
}

/* File Preview */
.file-preview {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

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

.file-details {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.file-name {
    font-weight: 600;
    font-size: 1rem;
    word-break: break-all;
}

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

.btn-remove {
    width: 36px;
    height: 36px;
    border: none;
    background: rgba(239, 68, 68, 0.2);
    color: var(--error);
    border-radius: var(--radius-full);
    font-size: 1.25rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* Mode Selection */
.mode-title {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
}

.mode-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

@media (max-width: 600px) {
    .mode-cards {
        grid-template-columns: 1fr;
    }
}

.mode-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.mode-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.mode-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

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

.mode-card[data-mode="instant"]:hover {
    border-color: var(--accent);
}

.mode-card[data-mode="instant"]::before {
    background: var(--gradient-accent);
}

.mode-card[data-mode="cloud"]:hover {
    border-color: var(--secondary);
}

.mode-card[data-mode="cloud"]::before {
    background: var(--gradient-secondary);
}

.mode-card.selected {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.15);
}

.mode-card.selected::before {
    opacity: 1;
}

.mode-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.mode-name {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.mode-description {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.mode-features {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.mode-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) 0;
    font-size: 0.9rem;
}

.feature-icon {
    font-size: 1rem;
}

.mode-requirement {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Progress */
.progress-container {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.progress-status {
    font-weight: 600;
}

.progress-percent {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.progress-bar {
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-normal);
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }

    100% {
        transform: translateX(100%);
    }
}

.progress-details {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Instant Waiting */
.instant-waiting {
    text-align: center;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
}

.instant-waiting h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.waiting-hint {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-lg);
}

.qr-container {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.qr-container canvas {
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.share-link-box {
    display: flex;
    gap: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
}

.share-link-box input {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 0.9rem;
    padding: var(--spacing-sm) var(--spacing-md);
    outline: none;
}

.btn-copy {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-copy:hover {
    transform: scale(1.05);
}

/* Success Animation */
.success-animation {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.success-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: var(--gradient-success);
    border-radius: var(--radius-full);
    font-size: 2.5rem;
    color: white;
    animation: successPop 0.5s ease-out;
}

@keyframes successPop {
    0% {
        transform: scale(0);
        opacity: 0;
    }

    50% {
        transform: scale(1.2);
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.share-title {
    text-align: center;
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
}

/* QR Section */
.qr-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.qr-code {
    padding: var(--spacing-md);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.qr-code canvas,
.qr-code img {
    display: block;
}

.btn-download-qr {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-download-qr:hover {
    background: var(--primary);
    border-color: var(--primary);
}

/* Share Options */
.share-options {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.share-link {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.share-link input {
    flex: 1;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
}

.share-link input:focus {
    border-color: var(--primary);
}

.btn-copy-main {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-copy-main:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-copy-main.copied {
    background: var(--gradient-success);
}

.share-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

.share-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 80px;
}

.share-btn:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
}

.share-btn.gmail:hover {
    background: rgba(234, 67, 53, 0.2);
    border-color: #ea4335;
}

.share-btn.email:hover {
    background: rgba(99, 102, 241, 0.2);
    border-color: var(--primary);
}

.share-btn.whatsapp:hover {
    background: rgba(37, 211, 102, 0.2);
    border-color: #25d366;
}

.share-btn.telegram:hover {
    background: rgba(0, 136, 204, 0.2);
    border-color: #0088cc;
}

/* Expiry Notice */
.expiry-notice {
    text-align: center;
    padding: var(--spacing-md);
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
    font-size: 0.9rem;
}

.expiry-icon {
    margin-right: var(--spacing-sm);
}

#expiryTime {
    font-weight: 700;
    font-family: monospace;
    color: var(--warning);
}

/* New Transfer Button */
.btn-new-transfer {
    display: block;
    width: 100%;
    padding: var(--spacing-md);
    background: transparent;
    border: 2px dashed var(--glass-border);
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-new-transfer:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
}

/* Receive View */
.receive-container {
    text-align: center;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
}

.receive-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    animation: float 3s ease-in-out infinite;
}

.receive-file-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin: var(--spacing-lg) 0;
}

.receive-file-name {
    font-size: 1.25rem;
    font-weight: 600;
}

.receive-file-size {
    color: var(--text-secondary);
}

.receive-progress {
    margin: var(--spacing-xl) 0;
}

.btn-accept {
    padding: var(--spacing-md) var(--spacing-2xl);
    background: var(--gradient-success);
    border: none;
    border-radius: var(--radius-full);
    color: white;
    font-size: 1.125rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-accept:hover {
    transform: scale(1.05);
    box-shadow: 0 0 30px rgba(34, 197, 94, 0.5);
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-xl) 0;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.footer-note {
    margin-top: var(--spacing-xs);
    font-size: 0.75rem;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-xl);
    color: var(--text-primary);
    font-size: 0.9rem;
    animation: toastIn 0.3s ease-out;
    box-shadow: var(--shadow-lg);
}

.toast.success {
    border-color: var(--success);
    background: rgba(34, 197, 94, 0.2);
}

.toast.error {
    border-color: var(--error);
    background: rgba(239, 68, 68, 0.2);
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-container {
        padding: var(--spacing-md);
    }

    .logo {
        font-size: 1.5rem;
    }

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

    .drop-zone {
        padding: var(--spacing-xl);
    }

    .drop-title {
        font-size: 1.25rem;
    }

    .mode-title {
        font-size: 1.25rem;
    }

    .mode-card {
        padding: var(--spacing-lg);
    }

    .mode-icon {
        font-size: 2.5rem;
    }

    .share-link {
        flex-direction: column;
    }

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

    .share-buttons {
        gap: var(--spacing-sm);
    }

    .share-btn {
        min-width: 70px;
        padding: var(--spacing-sm) var(--spacing-md);
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus States */
:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Selection */
::selection {
    background: var(--primary);
    color: white;
}