:root {
    --bg-dark: #090a0f;
    --card-bg: rgba(18, 22, 36, 0.75);
    --card-border: rgba(255, 255, 255, 0.08);
    --primary: #ffb703;
    --primary-hover: #ffa200;
    --secondary: #7209b7;
    --cyan: #00f5d4;
    --text-main: #f8f9fa;
    --text-muted: #94a3b8;
    --success: #10b981;
    --accent: #00f5d4;          /* FIX M-4: Was referenced but never defined */
    --text-color: #f8f9fa;      /* FIX M-4: Was referenced but never defined */
    --radius-lg: 16px;
    --radius-md: 10px;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.5;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Background Glow Effects */
.glow-bg {
    position: fixed;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 600px;
    background: radial-gradient(circle, rgba(255, 183, 3, 0.15) 0%, rgba(114, 9, 183, 0.1) 40%, rgba(0, 0, 0, 0) 70%);
    z-index: -1;
    pointer-events: none;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 2.5rem;
    background: rgba(10, 12, 20, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--card-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-circle {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, #ffb703, #fb8500);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    box-shadow: 0 0 20px rgba(255, 183, 3, 0.4);
}

.brand-title {
    font-weight: 800;
    font-size: 1.25rem;
    display: block;
    letter-spacing: -0.5px;
}

.brand-sub {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.status-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: var(--success);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background-color: var(--success);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--success);
    animation: pulse 1.8s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); opacity: 1; }
    50% { transform: scale(1.3); opacity: 0.5; }
    100% { transform: scale(0.95); opacity: 1; }
}

/* Layout */
.container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem;
}

/* Hero Section */
.hero-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
    gap: 2rem;
}

.hero-content h1 {
    font-size: 2.2rem;
    font-weight: 800;
    background: linear-gradient(135deg, #ffffff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 8px;
}

.hero-content p {
    color: var(--text-muted);
    font-size: 1rem;
    max-width: 600px;
}

.wallet-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 1.2rem 1.8rem;
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 280px;
}

.wallet-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 700;
}

.wallet-address {
    font-family: monospace;
    font-size: 1rem;
    color: var(--cyan);
    font-weight: 600;
}

.wallet-rank-badge {
    align-self: flex-start;
    background: rgba(255, 183, 3, 0.15);
    color: var(--primary);
    border: 1px solid rgba(255, 183, 3, 0.3);
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 700;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2.5rem;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.2rem;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-3px);
    border-color: rgba(255, 255, 255, 0.2);
}

.stat-icon {
    font-size: 2rem;
    background: rgba(255, 255, 255, 0.04);
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    display: block;
}

.stat-value {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-main);
    display: block;
    margin: 2px 0;
}

.stat-sub {
    font-size: 0.8rem;
    color: var(--cyan);
}

/* Workspace Grid */
.workspace-grid {
    display: grid;
    grid-template-columns: 1.8fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.glass-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 1.8rem;
    backdrop-filter: blur(12px);
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.3);
}

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

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.card-header h2 {
    font-size: 1.15rem;
    font-weight: 700;
}

/* Tree Visualizer Container */
.tree-container {
    min-height: 480px;
    background: rgba(5, 7, 12, 0.6);
    border-radius: var(--radius-md);
    border: 1px dashed rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    overflow-x: auto;
}

.tree-placeholder {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Tree Render Nodes */
.tree-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.8rem;
    width: 100%;
}

.node-box {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.9), rgba(15, 23, 42, 0.9));
    border: 1px solid var(--primary);
    padding: 0.8rem 1.2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(255, 183, 3, 0.2);
    min-width: 160px;

}

.node-address {
    font-family: monospace;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.node-vol {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.tree-children {
    display: flex;
    justify-content: space-around;
    width: 100%;
    position: relative;
    gap: 1rem;
}

.tree-branch {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
}

.branch-label {
    font-size: 0.7rem;
    font-weight: 800;
    color: var(--cyan);
    background: rgba(0, 245, 212, 0.1);
    padding: 2px 8px;
    border-radius: 6px;
    margin-bottom: 8px;
}

/* Forms & Inputs */
.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.input-group {
    display: flex;
    gap: 8px;
}

input[type="text"], input[type="number"] {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    color: var(--text-main);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s;
}

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

/* Buttons */
.btn-primary, .btn-secondary, .btn-accent, .btn-icon {
    font-family: inherit;
    font-weight: 600;
    font-size: 0.85rem;
    padding: 0.75rem 1.2rem;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    color: #000;
    box-shadow: 0 4px 15px rgba(255, 183, 3, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(255, 183, 3, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-main);
    border: 1px solid var(--card-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

.btn-accent {
    width: 100%;
    background: linear-gradient(135deg, var(--secondary), #4cc9f0);
    color: #fff;
    padding: 0.9rem;
    font-size: 0.95rem;
    box-shadow: 0 4px 20px rgba(114, 9, 183, 0.4);

}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(114, 9, 183, 0.6);
}

.btn-icon {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-main);
    border: 1px solid var(--card-border);
    white-space: nowrap;
}

/* Leg Selector */
.leg-selector {
    display: flex;
    gap: 8px;
}

.leg-btn {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    color: var(--text-muted);
    padding: 0.6rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.leg-btn.active {
    background: rgba(0, 245, 212, 0.15);
    border-color: var(--cyan);
    color: var(--cyan);
}

/* Data Table */
.full-width {
    margin-bottom: 2.5rem;
}

.table-responsive {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.data-table th, .data-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--card-border);
    font-size: 0.85rem;
}

.data-table th {
    color: var(--text-muted);
    font-weight: 600;
}

.data-table td {
    color: var(--text-main);
}

.text-center {
    text-align: center;
    color: var(--text-muted);
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--card-border);
    color: var(--text-muted);
    font-size: 0.85rem;
}

@media (max-width: 900px) {
    .workspace-grid {
        grid-template-columns: 1fr;
    }
    .hero-section {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* Custom Additions for Referral Banner & Node Activation */
.hidden {
    display: none !important;
}

.referral-banner {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: linear-gradient(135deg, rgba(255, 183, 3, 0.15) 0%, rgba(0, 245, 212, 0.1) 100%);
    border: 1px solid var(--accent);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    margin-bottom: 2rem;
    color: var(--text-color);
    font-weight: 600;
    box-shadow: 0 4px 20px rgba(0, 245, 212, 0.15);
}

.banner-icon {
    font-size: 1.25rem;
}

.activation-card {
    max-width: 600px;
    margin: 2rem auto;
    border: 1px solid var(--accent);
    box-shadow: 0 8px 32px rgba(0, 245, 212, 0.15);
}

.activation-header {
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 1rem;
}

.activation-header h2 {
    font-size: 1.5rem;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.activation-header p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.5;
}

.input-readonly {
    background: rgba(255, 255, 255, 0.03) !important;
    border-color: rgba(255, 255, 255, 0.1) !important;
    color: var(--text-muted) !important;
    cursor: not-allowed;
}

.btn-large {
    width: 100%;
    padding: 1.1rem;
    font-size: 1.05rem;
    font-weight: 700;
    margin-top: 1.5rem;
}

.form-help {
    display: block;
    margin-top: 0.35rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}


/* App Upgrade Layout & Login styling */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 2rem;
}

.login-card {
    max-width: 440px;
    width: 100%;
    padding: 2.5rem;
}

.app-layout {
    display: flex;
    min-height: calc(100vh - 80px);
}

.sidebar-nav {
    width: 240px;
    background: rgba(10, 12, 20, 0.6);
    backdrop-filter: blur(12px);
    border-right: 1px solid var(--card-border);
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.side-tab {
    width: 100%;
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    padding: 0.8rem 1rem;
    text-align: left;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.2s;
}

.side-tab:hover {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-main);
}

.side-tab.active {
    background: rgba(255, 183, 3, 0.1);
    color: var(--primary);
    border-color: rgba(255, 183, 3, 0.15);
}

.app-content {
    flex: 1;
    padding: 2rem 3rem;
    overflow-y: auto;
}

/* User profile avatar */
.profile-summary {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.04);
    padding: 6px 12px;
    border-radius: 20px;
    border: 1px solid var(--card-border);
}

.nav-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    object-fit: cover;
}

.nav-user-info {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.nav-username {
    font-size: 0.75rem;
    font-weight: bold;
    color: var(--text-main);
}

.nav-email {
    font-size: 0.65rem;
    color: var(--text-muted);
}

/* Package Tier Selection Cards */
.package-tier-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 1.2rem 1rem;
    text-align: center;
    transition: all 0.2s;
    user-select: none;
}

.package-tier-card:hover {
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.package-tier-card.active {
    background: rgba(16, 185, 129, 0.06);
    border-color: var(--success);
    box-shadow: 0 0 15px rgba(16, 185, 129, 0.15);
}

.package-name {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
    text-transform: uppercase;
}

.package-usdt {
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--text-main);
    margin-bottom: 0.25rem;
}

.package-yield {
    font-size: 0.75rem;
    color: var(--success);
    font-weight: bold;
}

/* Cursor helper */
.cursor-pointer {
    cursor: pointer;
}

/* Active status indicator overrides */
.node-box.active-node {
    border-color: var(--success) !important;
}

.node-box.inactive-node {
    border-color: #f43f5e !important;
}

/* Align flexboxes */
.flex {
    display: flex;
}

.justify-between {
    justify-content: space-between;
}

.font-bold {
    font-weight: 700;
}

/* Grid helpers */
.grid { display: grid; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.space-y-4 > * + * { margin-top: 1rem; }
.space-y-3 > * + * { margin-top: 0.75rem; }
.grid-cols-5, .grid-cols-6 {
    gap: 0.75rem;
}
/* FIX H-8: Responsive grid for payment details section */
.grid-cols-2-responsive { grid-template-columns: repeat(2, minmax(0, 1fr)); }

/* Mobile Responsiveness Improvements */
@media (max-width: 768px) {
    .navbar {
        height: auto;
        padding: 1rem;
        flex-direction: column;
        gap: 0.8rem;
        align-items: center;
        text-align: center;
    }

    .nav-user {
        width: 100%;
        justify-content: space-between;
        gap: 10px;
    }

    .app-layout {
        flex-direction: column;
        min-height: auto;
    }

    .sidebar-nav {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--card-border);
        flex-direction: row;
        overflow-x: auto;
        padding: 0.75rem 1rem;
        gap: 0.5rem;
        white-space: nowrap;
    }

    .side-tab {
        width: auto;
        padding: 0.5rem 0.8rem;
        font-size: 0.75rem;
    }

    .app-content {
        padding: 1.5rem 1rem;
    }

    .hero-section {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
        align-items: center;
    }

    .wallet-card {
        width: 100%;
        max-width: 320px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .workspace-grid {
        grid-template-columns: 1fr !important;
        gap: 1.5rem;
    }

    .grid-cols-5, .grid-cols-6 {
        grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
        gap: 0.5rem;
    }

    /* FIX H-8: Stack payment grid on mobile */
    .grid-cols-2-responsive {
        grid-template-columns: 1fr !important;
    }

    .package-tier-card {
        padding: 0.8rem 0.5rem;
    }

    .package-usdt {
        font-size: 0.95rem;
    }

    .package-yield {
        font-size: 0.7rem;
    }

    .login-card {
        padding: 1.5rem;
    }
}