/* Upgrade Modal Styles - Deep Tech Theme */
.upgrade-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.upgrade-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.upgrade-modal {
    background: #0a0a0a;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    max-width: 500px;
    width: 90%;
    padding: 0;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
    transform: scale(0.95) translateY(10px);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    overflow: hidden;
}

.upgrade-modal-overlay.active .upgrade-modal {
    transform: scale(1) translateY(0);
}

.upgrade-modal-header {
    background: #111;
    padding: 2rem 2rem 1rem 2rem;
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    position: relative;
}

.upgrade-modal-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.5rem;
    background: var(--primary, #4F46E5);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    box-shadow: 0 0 30px rgba(79, 70, 229, 0.4);
    color: white;
}

.upgrade-modal-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.upgrade-modal-subtitle {
    color: #a1a1aa;
    font-size: 0.95rem;
    line-height: 1.5;
}

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

.upgrade-features {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 1.25rem;
    margin-bottom: 2rem;
}

.upgrade-features-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: #71717a;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.upgrade-feature-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0;
    color: #e4e4e7;
    font-size: 0.9rem;
}

.upgrade-feature-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    background: rgba(79, 70, 229, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    color: #818cf8;
}

.upgrade-modal-actions {
    display: flex;
    gap: 1rem;
}

.upgrade-btn {
    flex: 1;
    padding: 0.875rem 1.5rem;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.upgrade-btn-primary {
    background: #fff;
    color: #000;
}

.upgrade-btn-primary:hover {
    background: #e0e0e0;
}

.upgrade-btn-secondary {
    background: transparent;
    color: #a1a1aa;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.upgrade-btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    color: #fff;
}

.upgrade-modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: transparent;
    border: none;
    color: #52525b;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.upgrade-modal-close:hover {
    background: rgba(255, 255, 255, 0.05);
    color: #fff;
}

/* Token Alert */
.token-alert {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.token-alert-text {
    color: #fca5a5;
    font-size: 0.9rem;
    font-weight: 500;
}